Cement grinding aids prepared with waste antifreeze

Abstract

It discloses cement grinding aids prepared with waste antifreeze which comprises the following components in parts by weight: 20-75 parts of pretreated waste antifreeze, 5-40 parts of alkanolamine, 1-5 parts of acid solution, 3-12 parts of saccharide and 15-50 parts of water. The pretreated waste antifreeze is prepared by adding an alkaline solution into waste antifreeze to regulate the pH value, adding a flocculant, and stirring and standing; separating upper-layer oil, and then filtering to remove flocculent precipitates, thus obtaining a clear mixed solution.

Claims

1. A cement grinding aid prepared with waste antifreeze, comprising the following components in parts by weight: TABLE-US-00005 pretreated waste antifreeze 20-75 parts, alkanolamine 5-40 parts, acid solution 1-5 parts, saccharide 3-12 parts, water 15-50 parts.

2. The cement grinding aid of claim 1, comprising the following components in parts by weight: TABLE-US-00006 pretreated waste antifreeze 25-55 parts, alkanolamine 5-35 parts, acid solution 1-5 parts, saccharide 5-10 parts, water 20-40 parts.

3. The cement grinding aid of claim 1, wherein the pretreated waste antifreeze is prepared by the following method: adding an alkaline solution into waste antifreeze to regulate pH value to 8-12, adding a flocculant, and stirring and standing; separating upper-layer oil, and then filtering to remove flocculent precipitates, thus obtaining a clear mixed solution.

4. The cement grinding aid of claim 3, wherein the alkaline solution is an aqueous solution of any of NaOH, KOH, triethanolamine, triisopropanolamine, diethanolisopropanolamine, N,N,N,N-tetra(2-ethoxy)ethylenediamine and ethanoldiisopropanolamine, and the mass concentration of solute is within the range of 20-99%.

5. The cement grinding aid of claim 3, wherein the flocculant is one compound or more compounds selected from a group consisting of aluminum sulfate, polyaluminum sulfate and polyacrylamide.

6. The cement grinding aid of claim 3, wherein the mass ratio of the flocculant to the pretreated waste antifreeze is (0.01-0.03): 1.

7. The cement grinding aid of claim 3, wherein standing time is 2-8 hours.

8. The cement grinding aid of claim 1, wherein the alkanolamine is any one of or a mixture of several of diethanolisopropanolamine, N,N,N,N-tetra(2-ethoxy)ethylenediamine and N-methyldiethanolamine.

9. The cement grinding aid of claim 1, wherein the acid solution is an aqueous solution of any one of acetic acid, sulfuric acid, hydrochloric acid and phosphoric acid, wherein the mass concentration of solute is 30-99%.

10. The cement grinding aid of claim 1, wherein the saccharide is at least one of or a mixture of several of molasses, corn syrup, glucose, saccharose and gluconic acid as well as salts of the glucose, saccharose or gluconic acid.

Description

DETAILED DESCRIPTION OF THE EMBODIMENTS

(1) A clear and complete description of the technical solutions in the embodiments of the present invention will be given below. Apparently, the described embodiments are merely a part, but not all, of the embodiments of the present invention. The present invention can be better understood according to the following embodiments. However, those skilled in the art could easily understand that the specific material proportions, process conditions and results described in the embodiments are merely used for illustrating the present invention, rather than limiting the present invention described in detail in the claims. All of other embodiments, obtained by those of ordinary skill in the art based on the embodiments of the present invention without any inventive effort, fall into the protection scope of the present invention.

(2) Embodiment 1:

(3) The waste antifreeze used in embodiment 1 is selected from a waste storage tank in an automobile repair plant A, is light red turbid liquid, and has the pH value of 8. 100 g of the waste antifreeze A is selected, 5 g of 20 wt % NaOH solution is added for regulating the pH value to 11, then 3 g of polyaluminum sulfate (PAS) is added, and the solution is stirred and allowed to stand for 8 h. Upper-layer oil is separated, then filtration is carried out for removing flocculent precipitates and solid impurities, and 101 g of light pink mixed solution is obtained, wherein the mixed solution contains 35.5% of ethylene glycol and 58.2% of water by gas chromatography.

(4) 56 weight parts of the above mixed solution is sequentially mixed with 17 weight parts of water, 18 weight parts of diethanolisopropanolamine (DEIPA), 3 weight parts of acetic acid (99%) and 6 weight parts of molasses, and the mixture is stirred, to obtain a cement grinding aid, the adding amount of which is 0.03% of the mass of cement.

(5) Embodiment 2:

(6) The waste antifreeze used in embodiment 2 is selected from a waste storage tank in an automobile repair plant B, is light blue turbid liquid, and has the pH value of 8.5. 100 g of the waste antifreeze B is selected, 6 g of 85% triethanolamine solution is added for regulating the pH value to 9, then 1 g of polyacrylamide (PAM) is added, and the solution is stirred and allowed to stand for 5 h. Upper-layer oil is separated, then filtration is carried out for removing flocculent precipitates and solid impurities, and 96 g of light blue mixed solution is obtained, wherein the mixed solution contains 38.1% of ethylene glycol and 56.3% of water by gas chromatography.

(7) 40 weight parts of the above mixed solution is sequentially mixed with 25 weight parts of water, 10 weight parts of triethanolamine, 5 weight parts of triisopropanolamine, 5 weight parts of phosphoric acid solution (30%), 10 weight parts of corn syrup and 5 weight parts of saccharose, and the mixture is stirred, to obtain a cement grinding aid, the adding amount of which is 0.05% of the mass of cement.

(8) Embodiment 3:

(9) The waste antifreeze used in embodiment 3 is selected from a waste storage tank in a chemical waste liquid yard C, is rusty turbid liquid, and has the pH value of 9. 100 g of the waste antifreeze C is selected, 10 g of 99% N,N,N,N-tetra(2-ethoxy)ethylenediamine (THEED) is added for regulating the pH value to 12, then 2 g of polyaluminium sulfate (PAS) is added, 1 g of polyacrylamide (PAM) is added after stirring, and the solution is stirred and allowed to stand for 2 h. Upper-layer oil is separated, then filtration is carried out for removing flocculent precipitates and solid impurities, and 92 g of light yellow mixed solution is obtained, wherein the mixed solution contains 34.3% of ethylene glycol and 62.1% of water by gas chromatography.

(10) 35 weight parts of the above mixed solution is sequentially mixed with 45 weight parts of water, 7 weight parts of triethanolamine, 2 weight parts of sulfuric acid solution (45%), 3 weight parts of diethanolisopropanolamine, 5 weight parts of saccharose and 3 weight parts of sodium gluconate, and the mixture is stirred, to obtain a cement grinding aid, the adding amount of which is 0.1% of the mass of cement.

(11) Embodiment 4:

(12) The waste antifreeze used in embodiment 4 is selected from an automobile maintenance site of an automobile repair plant D, is light red turbid liquid, and has the pH value of 7.5. 100 g of the waste antifreeze D is selected, 6 g of 85% triisopropanolamine solution is added for regulating the pH value to 8.5, 1.5 g of polyaluminium sulfate (PAS) is added, 1.5 g of polyacrylamide (PAM) is added after stirring, and the solution is stirred and allowed to stand for 4 h. Upper-layer oil is separated, then filtration is carried out for removing flocculent precipitates and solid impurities, and 105 g of light pink mixed solution is obtained, wherein the mixed solution contains 42.8% of ethylene glycol and 53.6% of water by gas chromatography.

(13) 28 weight parts of the above mixed solution is sequentially mixed with 45 weight parts of water, 4 weight parts of N,N,N,N-tetra(2-ethoxy)ethylenediamine (THEED), 2 weight parts of triethanolamine (TEA), 1 weight part of acetic acid (99%) and 20 weight parts of corn syrup, and the mixture is stirred, to obtain a cement grinding aid, the adding amount of which is 0.15% of the mass of cement.

COMPARATIVE EXAMPLE 1:

(14) 56 weight parts of the waste antifreeze not pretreated in embodiment 1 is sequentially mixed with 17 weight parts of water, 18 weight parts of diethanolisopropanolamine (DEIPA), 3 weight parts of acetic acid (99%) and 6 weight parts of molasses, and the mixture is stirred, to obtain a cement grinding aid, the adding amount of which is 0.03% of the mass of cement. A large amount of flocculent precipitates are separated out at the bottom of the solution after stirring, and the solution is turbid with a little oil on the surface.

COMPARATIVE EXAMPLE 2:

(15) 56 weight parts of ethylene glycol solution (having the content of 35.5%, and prepared according to the ethylene glycol concentration of the mixed solution in embodiment 1) is sequentially mixed with 17 weight parts of water, 18 weight parts of diethanolisopropanolamine (DEIPA), 3 weight parts of acetic acid (99%) and 6 weight parts of molasses, and the mixture is stirred, to obtain a cement grinding aid, the adding amount of which is 0.03% of the mass of cement.

(16) P.C32.5 cement is prepared according to table 1 below. Cement clinker and gypsum are firstly crushed to the diameter of less than 5 mm by a jaw crusher, and then are mixed uniformly with other materials according to a proportion.

(17) TABLE-US-00003 TABLE 1 P.C32.5 cement material proportion Water granulated Fly Material name Clinker Gypsum slag Limestone ash Percentage % 55 5 12 10 18

(18) The cement grinding aids in embodiment 1 and comparative examples 1 and 2 are respectively added into cement, the cement is diluted and then fed into a laboratory mill for milling for 25 minutes, and 45 um sieving residue, specific surface area and 3d/28d breaking/compressive strength of the milled cement sample are respectively measured as table 2, wherein the blank sample in table 2 indicates a cement sample not added with any grinding aid but milled for the same time.

(19) It can be seen from the comparison between embodiment 4 and embodiment 1 in table 2 that after the waste antifreeze provided in embodiment 1 of the present invention is modified, its application effect in the cement grinding aid is obviously improved, and particularly, the 3d and 28d compressive strengths are respectively increased 1.6 Mpa and 3.6 Mpa. It can be seen from the comparison between embodiment 1 and embodiment 2 in table 2 that the mixed liquid obtained after the waste antifreeze is treated can equivalently replace ethylene glycol in the traditional grinding aid formula, the grinding aid effect of the replacing product is similar, but the strengthening properties are better (3d/28d comprehensive strengths are respectively improved 0.5 Mpa and 1.3 Mpa), and the production cost of the cement grinding aid can be greatly reduced.

(20) TABLE-US-00004 TABLE 2 Grinding aid and strengthening effect comparison between embodiment 1 and comparative examples 1 and 2 Specific 45 um surface Breaking/compressive Adding sieving area strength/Mpa amount/% residue/% m.sup.2/kg 3 d 28 d Blank 15.8 386 3.6 15.8 7.5 36.2 sample Comparative 0.03 12.1 372 3.7 17.2 7.5 37.6 example 1 Comparative 0.03 11.2 381 3.7 18.1 7.6 39.8 example2 Embodiment 0.03 10.8 384 3.9 18.6 7.8 41.1 1 Embodiment 0.05 11.5 395 3.8 18.5 7.6 40.3 2 Embodiment 0.1 11.1 378 3.7 18.1 7.6 39.5 3 Embodiment 0.15 10.6 389 3.7 17.8 7.8 41.3 4

(21) It can be seen from the above embodiments and comparative examples that the cement grinding aid provided by the present invention does not contain chlorine ions, is low in production cost, and has better strengthening effects, particularly more obvious later strength.