Amorphous silicon for use in foods, drugs, cosmetics and feed, and production method and production device thereof

Abstract

A porous and easy water soluble amorphous silica which does not contain tar, crystal, residual agrichemicals, and carcinogens, and method and apparatus to produce same, by using only one burning treatment from a plant including abundant silica, including a method of manufacturing the amorphous silica wherein rice family plants are burned while stirring and introducing into the furnace an atmospheric gas having a mass of 6.7 or more and 20 or less of the weight of the rice family plants, or oxygen gas having a weight of 1.4 or more and 4 or less with respect to the weight of the rice family plants, and at the same time as burning, combustion gas generated at the time of combustion is discharged.

Claims

1. A method of manufacturing an amorphous silica by burning rice husks in a combustion apparatus, where the combustion apparatus includes a rotating kiln (2), a combustion chamber (3) for supplying heat to an entire interior of the kiln (2), and a heating source (4) facing the inside of the combustion chamber (3), the kiln (2) having a helical blade (31) and stirring blades (41) disposed therein, a material supply piping (15) having a supply screw (16) disposed upstream thereof, an upstream exhaust gas pipe (22) disposed upstream thereof, a downstream exhaust gas pipe (19) disposed downstream thereof, a water distribution pipe (12) at an end of the kiln (2), a drying section (2a) being set in the inside thereof to evaporate moisture contained in the rice husks, and a combustion section (2b) which is set in the inside thereof to burn the rice husks dried in the drying section (2a), and an atmosphere-oxygen supply pipe (26) for supplying atmosphere gas or oxygen gas into the inside of the kiln (2), the method comprising: supplying the rice husks into the inside of the kiln (2) via the material supply piping (15) by the screw (16); evaporating moisture contained in the rice husks by indirect heating of the combustion chamber (3); burning the rice husks at a temperature range between 500 C. or more and 700 C. or less by introducing atmospheric gas having a mass of 6.7 times or more and 20 times or less of the weight of the rice husks, or oxygen gas having a weight of 1.4 times or more and 4 times or less with respect to the weight of the rice husks into the inside of the kiln (2) through the atmosphere-oxygen supply pipe (26) while stirring the rice husks; and at the same time as said burning, discharging combustion gas generated at the time of combustion of the rice husks from the upstream exhaust gas pipe (22) and the downstream exhaust gas pipe (19).

2. The method of manufacturing an amorphous silica according to claim 1, wherein the rice husks are burned at the temperature range of between 550 C. or more and 650 C. or less.

3. A combustion apparatus, comprising: a rotating kiln (2); a combustion chamber (3) for supplying heat to an entire interior of the kiln (2); and a heating source (4) facing the inside of the combustion chamber (3), the kiln (2) having a helical blade (31) and stirring blades (41) disposed therein, a material supply piping (15) having a supply screw (16) disposed upstream thereof, an upstream exhaust gas pipe (22) disposed upstream thereof, a downstream exhaust gas pipe (19) disposed downstream thereof, a water distribution pipe (12) at an end of the kiln (2), a drying section (2a) which is set in the inside thereof configured so as to evaporate moisture contained in the rice husks, a combustion section (2b) which is set in the inside thereof configured so as to burn the rice husks dried in the drying section (2a), and an atmosphere-oxygen supply pipe (26) that supplies atmosphere gas or oxygen gas into the inside of the kiln (2).

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) FIG. 1 is a diagram of an X-ray analytical spectrum of a combustion product of rice husks.

(2) FIG. 2 is soluble test results of the combustion product of the rice husks in purified water at 40 C.

(3) FIG. 3 is a view of a combustion apparatus according to this embodiment.

(4) FIG. 4 is a view showing another example of the combustion device of the present embodiment.

EXPLANATION OF NUMBERS

(5) 1 indirect heating device 2 kilns 2a drying section 2 b combustion part 2 c internal space 2in entrance 2out exit 3 combustion chamber 3a exhaust pipe 4 heating source 5 piping section 6 cooling section 7 deodorizing part 8 dry distillation gas recovery section 9 auxiliary heating source 10 steam smoke route 11 lubricating section 12 water distribution pipe 13 fans 14 hopper 15 material supply piping 16 supply screw 17 second discharge pipe 18 cooling device 19 connection pipe (downstream exhaust pipe) 20 transport screw 21 transport screw 22 steam vent pipe (upstream exhaust gas pipe) 23 chimney section 24 circulating pipe 25 degassing pipe 26 atmosphere-oxygen supply pipe 30 connection 60 recovery section 31 helical blade 41 stirring blade 51 screw shaft 61 air supply opening 71 atmospheric supply pipe 81 oxygen supply tube 91 smoke eliminating device P input material Q material containing amorphous silica 100,101 charcoal of rice husks 200 capsules 300 capsule containers 400 capsules 500 capsule type food 501 pellet type food 600 binder

DETAILED DESCRIPTION OF THE INVENTION

(6) The mode for carrying out the present invention is,

(7) a method of manufacturing an amorphous silica which is porous and easily soluble in water and which does not contain tar, crystal, residual agrichemicals and carcinogens,

(8) which comprising,

(9) burning the rice husks etc. at the temperature range of between 500 C. or more and 700 C. or less, while stirring the rice husks etc.,

(10) by introducing at atmospheric gas having a mass of 6.7 times or more and 20 times or less of the weight of the rice husks etc., oxygen gas having a weight of 1.4 times or more and 4 times or less with respect to the weight of the rice husks etc., or mixed gas of the atmospheric gas and the oxygen gas into the furnace,
at the same time as burning, combustion gas generated at the time of combustion rice husks etc. is discharged from the furnace.

(11) The mode for carrying out the present invention is,

(12) a method of manufacturing an amorphous silica which is porous and easily soluble in water and which does not contain tar, crystal, residual agrichemicals and carcinogens,

(13) which comprising,

(14) burning the rice husks etc. at the temperature range of between 550 C. or more and 650 C. or less, while stirring the rice husks etc., by introducing at atmospheric gas having a mass of 6.7 times or more and 20 times or less of the weight of the rice husks etc., oxygen gas having a weight of 1.4 times or more and 4 times or less with respect to the weight of the rice husks etc., or mixed gas of the atmospheric gas and the oxygen gas into the furnace,
at the same time as burning, combustion gas generated at the time of combustion rice husks etc. is discharged from the furnace.

(15) Here, amorphous silica which is a combustion product such as rice husks or the like is readily soluble in water even at a temperature within the range of 40 C. or less in the living body temperature.

(16) A combustion device according to an embodiment of the present invention is a combustion device that burns rice husks or the like to obtain a combustion product such as rice husks, wherein the combustion device is configured to rotate a rotary kiln or a screw Wherein a rotating shaft portion of the screw has a hollow portion, atmosphere or oxygen or a mixture thereof is introduced into the hollow portion, and exhaust gas generated upon combustion of the rice husks or the like is supplied to a furnace And has an exhaust mechanism for discharging the exhaust gas to the outside.

EXAMPLE

Example 1

(17) FIG. 1 is a diagram of an X-ray analytical spectrum of a combustion product of rice husks.

(18) An X-ray analytical spectrum diagram in the case of combustion temperature 450 C., combustion temperature 550 C., combustion temperature 650 C., combustion temperature 700 C. are shown in order from upward in FIG. In either case, it is found that the shape of the X-ray analysis spectrum is a broad shape without a peak showing crystallinity, and the rice husks combustion product is amorphous.

Example 2

(19) FIG. 2 shows the dissolution test results of the combustion product of the rice husks in purified water at 40 C.

(20) From the test results shown in FIG. 2, it can be seen that the lower the production temperature, the better the water solubility. Also, in the case of silica gel which is one type of amorphous silica, it is found that it is hardly dissolved. Considering the results of the X-ray analysis shown in FIGS. 1 and 2, even if it is amorphous silica, not all of them are easily water-solubilized but their properties are greatly different depending on the production temperature and the manufacturing method. Although the manufacturing temperature is low, rice husk burned materials have high water solubility, but the production time is long and economic efficiency is not excellent. Also, if it is below 500 C., it is likely to produce benzotriazole which is a carcinogenic substance, so it is not suitable for edible use. When the production temperature is high, the production becomes easy, but the water solubility becomes low. It is generally considered that the combustion product of the rice husks exceeding 800 C. will crystallize, and crystalline silica is also considered to be carcinogenic, so it is also not suitable for edible use.

(21) Therefore, amorphous silica which does not contain carcinogens and has high water solubility means that the temperature is as low as possible at a production temperature of 500 C. or higher. Considering the production efficiency for this, the optimum production temperature for practical use is in the range of 550 to 650 C.

Example 3

(22) Various analyzes were carried out on amorphous silica obtained from rice husk burned material at a combustion temperature of 600 C. A series of results will be described. The inspection agency is Japan Food Function Analysis Research Institute Co., Ltd.

(23) Table 1 shows the test results on the bacteria of the amorphous silica-containing rice husk burned material of the present invention.

(24) From Table 1, it is found that the number of general viable bacteria is 300 or less/g, and the coliform bacteria group is negative.

(25) TABLE-US-00001 TABLE 1 Test Results about Bacteria of Rice Hull Burned Material containing Amorphous Silicon Detection Test Items Test Result Limit Test Method number of general 300 or less/g standard agar viable bacteria plate culture method coliform bacteria group negative BGLB medium (qualitative analysis) culture method

(26) Table 2 is an analysis on the content of amorphous silica of the present invention. 41000 mg of silica was confirmed in the rice husk burned material in 100 g.

(27) TABLE-US-00002 TABLE 2 Content of Amorphous Silicon Detection Test Item Test Result Limit Test Method silicon 41000 mg/100 g absorption photometry

(28) Table 3 shows the test results concerning the presence or absence of the amorphous silica radioactive substance of the present invention.

(29) From Table 3, radioactive iodine and radioactive cesium are not detected.

(30) TABLE-US-00003 TABLE 3 Presence/Absence of Amorphous Silicone Radioactive Substance Detection Test Items Test Result Limit radioactive iodine (iodine-131) not detected 3.6 Bq/kg radioactive cesium not detected sesium-134 not detected 5.0 Bq/kg sesium-137 not detected 4.0 Bq/kg

(31) Table 4 shows the test results of the presence or absence of harmful metals and the presence or absence of carcinogens of the amorphous silica-containing burned rice flour.

(32) From Table 4, it was found that the carcinogenic substance, benzpyrene, was not detected.

(33) TABLE-US-00004 TABLE 4 Presence/Absence of Harmful Metals and Carcinogenic Substances of Rice Hull Burned Material including Amorphous Silicone Detection Test Items Test Result Limit Test Mothod cadmium 0.02 ppm ICP emission spectroscopy lead 0.2 ppm ICP emission spectroscopy arsenicum not detected 0.1 ppm ICP emission spectroscopy mercury not detected 0.01 ppm gold amalgam method benzpyrene not detected 0.01 ppm gas chromatograph mass spectroscopy

(34) Table 5 shows the test results of the detection of residual agrichemicals of amorphous silica-containing rice husk burned materials of the present invention.

(35) Residual pesticides (276 items) were all undetected.

(36) Tables 6, 7, 8, and 9 show a list of concrete residual agrichemical items.

(37) TABLE-US-00005 TABLE 5 Detection of Residual Agrichemicals in Rice Hull Burned Material Including Amorphous Silicon Detection Test Items Test Result Limit Test Method residual all undetected 0.1 ppm simultenaous agrichemicals analysis with 276 items

(38) TABLE-US-00006 TABLE 6 List of Residual Agrichemicals (1) Result of Detection Analytical Analysis Items Analysis Limit Method BHC (summation of not detected 0.1 *1 and ) BHC () not detected 0.1 *1 BHC () not detected 0.1 *1 BHC () not detected 0.1 *1 BHC () not detected 0.1 *1 EPN not detected 0.1 *1 IBP not detected 0.1 *1 op-OOD not detected 0.1 *1 op-OOE not detected 0.1 *1 op-OOT not detected 0.1 *2 pp-OOD not detected 0.1 *1 pp-OOE not detected 0.1 *1 pp-OOT not detected 0.1 *1 XMO not detected 0.1 *1 acrinathrin not detected 0.1 *1 azaconazole not detected 0.1 *1 azinphos-methyl not detected 0.1 *1 acetamiprid not detected 0.1 *2 acetochlor not detected 0.1 *1 azoxystrobin not detected 0.1 *2 atrazine not detected 0.1 *1 anilofos not detected 0.1 *1 amitraz not detected 0.1 *1 ametrine not detected 0.1 *1 alachlor not detected 0.1 *1 aldrin not detected 0.1 *1 allethrin not detected 0.1 *1 isouron not detected 0.1 *2 isoxathion not detected 0.1 *2 isofenphos not detected 0.1 *1 isofenphos oxon not detected 0.1 *1 isoprocarb not detected 0.1 *1 isoprothiolane not detected 0.1 *1 iprobenfos not detected 0.1 *1 imazosulfuron not detected 0.1 *2 imidacloprid not detected 0.1 *2 indoxacarb not detected 0.1 *2 uniconazole P not detected 0.1 *1 esprocarb not detected 0.1 *1 ethalfluralin not detected 0.1 *1 ethion not detected 0.1 *1 ethylchiometon not detected 0.1 *1 edifenphos not detected 0.1 *1 etoxazole not detected 0.1 *1 etofenprox not detected 0.1 *1 ethoprophos not detected 0.1 *1 -endosulfan not detected 0.1 *1 -endosulfan not detected 0.1 *1 endrin not detected 0.1 *1 oxadiazon not detected 0.1 *1 oxadixyl not detected 0.1 *1 oxaziclomefone not detected 0.1 *1 oxyfluorfen not detected 0.1 *1 orysastrobin not detected 0.1 *1 cadusafos not detected 0.1 *1 cafenstrole not detected 0.1 *2 calbaryl (NAC) not detected 0.1 *1 karbutilate not detected 0.1 *2 carbendazole (MBC) not detected 0.1 *2 carbofuran not detected 0.1 *1 quinalphos not detected 0.1 *1 quinoxyfen not detected 0.1 *1 quinoclamine not detected 0.1 *1 captan not detected 0.1 *1 quintozene not detected 0.1 *1 kresoxim-methyl not detected 0.1 *1 clothianidin not detected 0.1 *2 chromafenozide not detected 0.1 *2 chlorthal-dimethyl not detected 0.1 *1 chlorothalonil (TPN) not detected 0.1 *1 chlordane (cis) not detected 0.1 *1 chlordane (trans) not detected 0.1 *1 chlorpyrifos not detected 0.1 *1 chlorpyrifos-methyl not detected 0.1 *1 chlorfenapyr not detected 0.1 *1 Analytical Method: *1 Gas Chromatograph Mass Spectrometry, *2 Liquid Chromatograph Mass Spectrometry

(39) TABLE-US-00007 TABLE 7 List of Residual Agrichemicals (2) Result of Detection Analytical Analysis Items Analysis Limit Method chlorfenvinphos (E) not detected 0.1 *1 chlorfenvinphos (Z) not detected 0.1 *1 chlorpropham not detected 0.1 *1 chlorobenzilate not detected 0.1 *1 cyanazine not detected 0.1 *1 cyanophos not detected 0.1 *1 diuron (DCMU) not detected 0.1 *2 diethofencarb not detected 0.1 *1 diclocymet - 1 not detected 0.1 *1 diclocymet - 2 not detected 0.1 *1 dichlofenthion not detected 0.1 *1 dichlobenil (DBN) not detected 0.1 *1 diclofop-methyl not detected 0.1 *1 dicloran not detected 0.1 *1 dichlorvos (DDVP) not detected 0.1 *2 cyhalothrin not detected 0.1 *1 cyhalohop butyl not detected 0.1 *1 diphenamid not detected 0.1 *1 difenoconazole not detected 0.1 *1 cyfluthrin - 1 not detected 0.1 *1 cyfluthrin - 2 not detected 0.1 *1 cyfluthrin - 3 not detected 0.1 *1 diflufenican not detected 0.1 *1 cyproconazole not detected 0.1 *1 cyprodinil not detected 0.1 *1 cypermethrin - 1 not detected 0.1 *1 cypermethrin - 2 not detected 0.1 *1 cypermethrin - 3 not detected 0.1 *1 cypermethrin - 4 not detected 0.1 *1 simazine not detected 0.1 *1 dimethametryn not detected 0.1 *1 dimethylvinphos (Z) not detected 0.1 *1 dimethenanid not detected 0.1 *1 dimethoate not detected 0.1 *1 simetryn not detected 0.1 *1 dimepiperate not detected 0.1 *1 silafluofen not detected 0.1 *1 spinosyn A not detected 0.1 *2 spinosyn D not detected 0.1 *2 spiroxamine - 1 not detected 0.1 *1 spiroxamine - 2 not detected 0.1 *1 zoxamide not detected 0.1 *1 terbacil not detected 0.1 *1 diazinon not detected 0.1 *1 daimuron not detected 0.1 *2 thiacloprid not detected 0.1 *2 thiamethoxam not detected 0.1 *2 thiophanate-methyl not detected 0.1 *2 thiobencarb not detected 0.1 *1 thifensulfuron-methyl not detected 0.1 *2 thifluzamide not detected 0.1 *1 dieldrin not detected 0.1 *1 tecnazene not detected 0.1 *1 tetrachlorvinphos not detected 0.1 *1 tetraconazole not detected 0.1 *1 tetradiphon not detected 0.1 *1 thenylchlor not detected 0.1 *1 tebuconazole not detected 0.1 *1 tebufenozide not detected 0.1 *2 tebufenpyrad not detected 0.1 *1 tefluthrin not detected 0.1 *1 deltamethrin not detected 0.1 *1 terbutryn not detected 0.1 *1 terbufos not detected 0.1 *1 tralomethrin not detected 0.1 *1 triadimenol not detected 0.1 *1 triadimefon not detected 0.1 *1 triazophos not detected 0.1 *1 tri-allate not detected 0.1 *1 tricyclazole not detected 0.1 *2 tribuphos not detected 0.1 *1 triflumizole not detected 0.1 *2 triflumizole metabolite not detected 0.1 *2 trifluralin not detected 0.1 *1 trifloxystrobin not detected 0.1 *1 Analytical Method: *1 Gas Chromatograph Mass Spectrometry, *2 Liquid Chromatograph Mass Spectrometry

(40) TABLE-US-00008 TABLE 8 List of Residual Agrichemicals (3) Result of Detection Analytical Analysis Items Analysis Limit Method tolclofos-methyl not detected 0.1 *1 tolfenpyrad not detected 0.1 *1 napropamide not detected 0.1 *1 nitrothal-isopropyl not detected 0.1 *1 norflurazon not detected 0.1 *1 paclobutrazol not detected 0.1 *1 parathion not detected 0.1 *1 parathion-methyl not detected 0.1 *1 (methyl-parathion) halfenprox not detected 0.1 *1 bitertanol not detected 0.1 *1 bifenox - 1 not detected 0.1 *1 bifenox - 2 not detected 0.1 *1 bifenthrin not detected 0.1 *1 piperophos not detected 0.1 *1 pyraclofos not detected 0.1 *1 pyrazosulfuron-ethyl not detected 0.1 *2 pyrazophos not detected 0.1 *1 pyrazolate not detected 0.1 *2 pyraflufen-ethyl not detected 0.1 *1 pyridafenthion not detected 0.1 *1 pyridaben not detected 0.1 *1 pyrifenox (E) not detected 0.1 *1 pyrifenox (Z) not detected 0.1 *1 pyriftalid not detected 0.1 *2 pyributicarb not detected 0.1 *1 pyriproxyfen not detected 0.1 *1 pyriminobac-methyl (E) not detected 0.1 *1 pyriminobac-methyl (Z) not detected 0.1 *1 pirimiphos-methyl not detected 0.1 *1 pyrimethanil not detected 0.1 *1 pyrethin - 1 not detected 0.1 *1 pyrethin - 2 not detected 0.1 *1 pyroquilon not detected 0.1 *2 vinclozolin not detected 0.1 *1 fipronil not detected 0.1 *1 fenamiphos not detected 0.1 *1 fenarimol not detected 0.1 *1 fenitrothion not detected 0.1 *1 fenoxanil not detected 0.1 *1 fenothiocarb not detected 0.1 *1 phenothrin - 1 not detected 0.1 *1 phenothrin - 2 not detected 0.1 *1 fenobucarb not detected 0.1 *1 ferimzone (Z) not detected 0.1 *1 fensulfothion not detected 0.1 *1 fenthion not detected 0.1 *1 phenthoate not detected 0.1 *1 fentrazamide not detected 0.1 *2 fenvalerate - 1 not detected 0.1 *1 fenvalerate - 2 not detected 0.1 *1 fenpyroximate not detected 0.1 *2 fenbuconazole not detected 0.1 *1 fenpropathrin not detected 0.1 *1 fenpropimorph not detected 0.1 *1 fthalide not detected 0.1 *1 butachlor not detected 0.1 *1 butamifos not detected 0.1 *1 bupirimate not detected 0.1 *1 buprofezin not detected 0.1 *1 flazasulfuron not detected 0.1 *2 flamprop-methyl not detected 0.1 *1 fluacrypyrim not detected 0.1 *1 fluquinconazole not detected 0.1 *1 flucythrinate - 1 not detected 0.1 *1 flucythrinate - 2 not detected 0.1 *1 flutolanil not detected 0.1 *1 fluvalinate not detected 0.1 *2 flufenoxuron not detected 0.1 *2 flubendiamide not detected 0.1 *2 flumioxazin not detected 0.1 *1 flumiclorac-pentyl not detected 0.1 *1 fluridone not detected 0.1 *1 pretilachlor not detected 0.1 *1 prodiamine not detected 0.1 *1 procymidone not detected 0.1 *1 Analytical Method: *1 Gas Chromatograph Mass Spectrometry, *2 Liquid Chromatograph Mass Spectrometry

(41) TABLE-US-00009 TABLE 9 List of Residual Agrichemicals (4) Result of Detection Analytical Analysis Items Analysis Limit Method prothiofos not detected 0.1 *1 propachlor not detected 0.1 *1 propazine not detected 0.1 *1 propanil not detected 0.1 *1 propargite not detected 0.1 *1 propiconazole - 1 not detected 0.1 *1 propiconazole - 2 not detected 0.1 *1 propyzamide not detected 0.1 *1 prohydrojasmon - 1 not detected 0.1 *1 prohydrojasmon - 2 not detected 0.1 *1 profenofos not detected 0.1 *1 propoxur not detected 0.1 *1 bromacil not detected 0.1 *1 prometryn not detected 0.1 *1 bromobutide not detected 0.1 *1 bromopropylate not detected 0.1 *1 bromophos not detected 0.1 *1 hexaconazole not detected 0.1 *1 hexazinone not detected 0.1 *1 benalaxyl not detected 0.1 *1 benoxacor not detected 0.1 *1 permethrin (isomer 1) not detected 0.1 *1 permethrin (isomer 2) not detected 0.1 *1 penconazole not detected 0.1 *1 pencycuron not detected 0.1 *1 bensulfuron-methyl not detected 0.1 *2 benzobicyclon not detected 0.1 *2 pendimethalin not detected 0.1 *1 benfuracarb not detected 0.1 *1 benfluralin not detected 0.1 *1 benfuresate not detected 0.1 *1 phosalone not detected 0.1 *1 boscalid not detected 0.1 *1 fosthiazate not detected 0.1 *1 phosphamidon not detected 0.1 *1 phosmet not detected 0.1 *1 malachion not detected 0.1 *1 myclobutanil not detected 0.1 *1 methidathion not detected 0.1 *1 methoxychlor not detected 0.1 *1 metominostrobin not detected 0.1 *2 metolachlor not detected 0.1 *1 metribuzin not detected 0.1 *2 mepanipyrim not detected 0.1 *1 mevinphos not detected 0.1 *1 mefenacet not detected 0.1 *1 mefenoxam not detected 0.1 *1 mefenpyr-diethyl not detected 0.1 *1 mepronil not detected 0.1 *1 monocrotophos not detected 0.1 *1 linuron not detected 0.1 *2 lenacil not detected 0.1 *1 Analytical Method: *1 Gas Chromatograph Mass Spectrometry, *2 Liquid Chromatograph Mass Spectrometry

(42) Using the amorphous silica-containing rice husk burned material of the present invention as a specimen, in accordance with the OECD Guideline for the Testing of Chemicals 404 (2002), a skin primary irritation test using a rabbit was performed.

(43) The specimens were closed to the intact and scarred skin of 3 rabbits for 24 hours. As a result, 1 hour after removal, very mild to clear erythema was seen in all cases, and in 2 cases very mild edema was seen but disappeared by 72 hours.

(44) ISO 10993-10 Biological

(45) Evaluation of Medical

(46) The primary irritation index (PII) obtained according to DevicesPart 10 (2010) was 0.4.

(47) From the above, in the primary skin irritation test using rabbits, specimens were evaluated as falling within the category of nonirritating.

(48) Acute oral toxicity test (limit test) using rats was conducted using the amorphous silica-containing burned rice flour sample as a specimen of the present invention. Samples at a dose of 2,000 mg/kg were orally administered to the test group to male and female rats as water control for solvent control as control group and observed for 14 days. As a result, no abnormalities and deaths were observed during the observation period. From the above, it was evaluated that in a single oral administration using rats, the LD50 value of the specimen exceeded 2,000 mg/kg in both males and females.

Example 4

(49) Application to Food and Medicine

(50) The amorphous silica of the present invention is effective for improving the bone density of the human body. Subjects From the age of 40 to the age of 80, the bone density tended to rise as a result of giving the amorphous silica of the present invention every day. Application as a supplement to improve bone density is also possible.

(51) Table 10 shows that bone density before and after ingestion is measured by ingesting about 100 mg of amorphous silica containing powder of the present invention (silica content 40% or more) in 10 males and females age 45 to 82 years a day It is the result.

(52) Here, Table 10 shows the ultrasonic bone density measurement result of the bone of the subject's heel.

(53) TABLE-US-00010 TABLE 10 Measurement Results about Influence on Bone Density of Amorphous Silicon Before After Ingestion Increase or Ingestion Ingestion Period Decrease Age, Sex (m/s) (m/s) (day) (m/s) 51 years 1467.9 1473.6 193 +5.7 old, Man 58 years 1443.6 1472.4 187 +28.8 old, Man 45 years 1514.7 1547.5 191 +32.8 old, Woman 53 years 1482.1 1483.7 200 +1.6 old, Woman 61 years 1458.4 1481.3 187 +22.9 old, Woman (1) 61 years 1456.9 1478.4 182 +21.5 old, Woman (2) 62 years 1509.7 1524.6 201 +14.9 old, Woman 72 years 1451.2 1477.5 194 +26.3 old, Woman 75 yaers 1443.6 1469.7 182 +26.1 old, Woman 82 years 1467.3 1484.9 198 +17.6 old, Woman

(54) According to Table 10, it is understood that the bone densities of all subjects, men and women aged 45 to 82 years, increased before and after ingestion by all subjects.

(55) Furthermore, silica is absorbed from the intestinal wall and has the effect of solubilizing adherents inside the defect as it passes through the blood vessel, which is effective also in preventing arteriosclerosis.

Example 5

(56) Application to Cosmetics

(57) Silica is also contained in the human body and exists in hair, nails, blood vessels, bones, joints and cell walls. In vivo silica has a function of bundling collagen, it helps regeneration, reinforcement and maintenance of bones, hair, nails, and collagen, as well as skin moisture retention and the like.

Example 6

(58) Application to Feed

(59) This example is an example in which amorphous silica of the present invention is mixed with feed. It is a method of mixing amorphous silica directly into livestock feed. This will promote the health of livestock and cancer-giving animals, and will also improve meat quality.

Example 7

(60) FIG. 3 is a diagram of the combustion apparatus of this embodiment.

(61) The combustion apparatus used in the present invention has,

(62) a rotating kiln 2 having helical blade and stirring blades disposed therein, an air/oxygen supply pipe 26 for supplying atmospheric air or oxygen or a mixed gas of said atmosphere and said oxygen,

(63) a combustion chamber 3 for supplying heat to the entire interior of one kiln 2 by burning rice husks etc. while indirectly heating the rice husks or the like thrown into the one kiln 2,

(64) a heating source 4 such as a burner facing the inside of the combustion chamber 3,

(65) a drying section 2a which is set in the inside of the kiln 2 so as to evaporate moisture contained in the rice husks etc. thrown into the kiln 2 by indirect heating of the combustion chamber 3, and

(66) a combustion section 2b which is set in the inside of the kiln 2 so as to burn rice husks etc. dried in the drying section 2a.

Example 8

(67) FIG. 4 is a diagram of another example of the combustion device of this embodiment.

(68) The combustion apparatus used in the present invention has

(69) a pipe 71 for supplying atmospheric air,

(70) a pipe 81 for supplying oxygen,

(71) an indirect heating device 1 such as an electric furnace capable of setting an arbitrary temperature,

(72) Kiln 2,

(73) an opening portion 61 of a rotating screw shaft for supplying the atmospheric air, the oxygen or a mixed gas thereof into the kiln,

(74) a helical blade 31, and

(75) stirring blades 41.

INDUSTRIAL APPLICABILITY

(76) According to the present invention, the combustion treatment is one step, rich in rice plant, rice straw, rice bran, rice family plants such as wheat, corn, grass, and the like, and horsetail, tea, potato, etc. Amorphous silicon that is used for foods, medicines, cosmetics, and feeds that do not contain tar, crystal, residual agrichemicals and carcinogens from vegetable silicon and are easily porous and soluble in water, and methods and apparatus for producing the same It contributes to the promotion of human health and the development of livestock industry.