The present disclosure provides a phase inversion pore-forming agent and a pore-forming method for a fly ash-based ceramic flat membrane support. The phase inversion pore-forming agent includes poly(oxyphenylene sulfone) and N-methylpyrrolidone (NMP), and is used in a preparation process of the fly ash-based ceramic flat membrane support. Pores can be formed through phase inversion, forming straight-through pores with gradient distribution inside the ceramic flat membrane support, thus avoiding a low porosity, a poor water flux, and uneven pore formation of the existing fly ash-based ceramic flat membrane support.

Plant for the recovery of spent refractory material in steel plants, comprising at least one receiving area (1) for said refractory material, at least one material sieving area (2), at least one magnetic separation area (3) and at least one sorting area (4).

Said receiving area (1) communicates with a first sieving area (2) comprising first sieving means intended to divide said refractory material in at least two fractions, of which a coarse fraction and a fine fraction, on the basis of the size of said material.

There is further provided a second sieving area (21) comprising second sieving means intended to divide said fine fraction into at least two further sub-fractions (A, B, C) on the basis of size.

A refractory object may include a Cr.sub.2O.sub.3 content of at least about 80 wt. % of a total weight of the refractory object, an Al.sub.2O.sub.3 content of at least about 0.7 wt. % and not greater than about 10.0 wt. % of the total weight of the refractory object, a SiO.sub.2 content of at least about 0.3 wt. % and not greater than about 5.0 wt. % of the total weight of the refractory object and a TiO.sub.2 content of at least about 1.0 wt. % and not greater than about 5.6 wt. % TiO.sub.2 of the total weight of the refractory object. The refractory object may further include an MOR of at least about 37 MPa as measured at 1200 C.

A material useful as a proppant comprises a core chemically reacted in situ from coal dust and a polymer derived ceramic material, such that at least a portion of the coal dust is chemically converted to a ceramic, nanoparticles, graphene, nanofibers or combinations of any of these.

A process for recovery of all or some abrasive elements contained in an abrasive material in which the abrasive elements are dispersed in a resin with at least one phenolic hydroxyl group, the process including steps of: a) bringing the abrasive material into contact with an aqueous nitric solution (S.sub.1), whereby an aqueous nitric solution (S.sub.2) is obtained containing abrasive elements and residue derived from degradation of the resin; then (b) separating the abrasive elements from the aqueous nitric solution (S.sub.2) obtained after step (a). The use of abrasive elements thus recovered particularly to prepare agglomerated abrasives or coated abrasives.

The disclosure discloses a method for preparing a multifunctional ecological exterior wall, including: preparing a ceramic board of a ceramic thermal insulation waterproof layer; preparing a ceramic sound-absorbing board of a sound-absorbing layer; and installing a ecological exterior wall: leveling a surface of the wall of a building with cement slurry, and applying a cement bonding layer thereon; laying the ceramic thermal insulation waterproof board on the cement bonding layer, and applying the cement bonding layer on the ceramic board; laying the ceramic sound-absorbing board on the cement bonding layer and reserving a gap used to place a pipe; driving the screw-thread steel bolt from the surface of the ceramic sound-absorbing board into the wall obliquely; installing and fixing the pipe in the gap, which is reserved at the upper of the ceramic sound-absorbing board; planting a green plant on the surface of the ceramic board of the sound-absorbing layer.

A method for preparing a refractory material from waste battery residues. The method comprises the following steps: (1) disassembling waste batteries, then sorting same to obtain positive and negative electrode powders, leaching the positive and negative electrode powders with an acid, filtering same to obtain a graphite slag, and then subjecting the filtrate to copper removal, followed by the addition of an alkali for a precipitation reaction, wherein the resulting precipitate is an iron-aluminum slag; (2) wrapping the graphite slag obtained in step (1) with wet clay to form an inner core material, then mixing wet clay with the iron-aluminum slag, wrapping the inner core material with same, and aging the wrapped inner core material to obtain a blank; (3) pre-sintering, calcining and cooling the blank prepared in step (2) to obtain a fired product; and (4) washing and drying the fired product to obtain the refractory material.

A method for preparing an ecological foamed ceramic from lepidolite filter mud whole waste belongs to the field of environmental protection and resource reuse. The ecological foamed ceramic with excellent properties can be prepared by using lepidolite filter mud as the main raw materials, including ball milling, homogenization, drying, material distribution, and heat treatment. The amount of lepidolite filter mud in the present invention accounts for more than 90%, which is a whole waste utilization and can achieve high-value utilization of bulk lepidolite filter mud. The present invention uses a composite foaming agent combined with a foaming technology and has the advantages of rapid foaming and controllable pore size compared with a single foaming agent. The ecological foamed ceramic prepared by the present invention meets the industrial standard of CJ/T 299-2008 Artificial ceramic filter material for water treatment and has potential application value in domestic sewage treatment.

The present disclosure provides a preparation method of a fly ash-based ceramic membrane support, including the following steps: 1) subjecting fly ash to alkali washing and acid washing to obtain pretreated fly ash; 2) blending a raw material including the pretreated fly ash, and then conducting aging and extrusion molding to obtain a green body; and 3) spraying a surface water-retaining agent (including glycerol, tung oil, a diol, and polyethylene glycol) on a surface of the green body to allow static curing in a constant-temperature and constant-humidity environment, and then conducting drying and sintering after the curing is completed. The preparation method can effectively improve molding and sintering performances of the fly ash to obtain a fly ash-based ceramic membrane support with a qualified performance.

The present invention relates to a heating cooker using a ceramic heating element and a manufacturing method thereof, the method comprising: a cooker body preparation step; a heating element material preparation step of preparing any one or more selected from among mill scale, steelmaking slag and magnetite (Fe.sub.3O.sub.4); an inorganic binder preparation step of preparing, as an inorganic binder, a colloidal silica sol having a colloidal silica content of 8 to 30 wt %; a mixing step of mixing 20 to 40 parts by weight of the colloidal silica sol as the inorganic binder with 100 parts by weight of the heating element material, thereby making a heating material paste; an application step of applying the heating element paste to the bottom of the cooker body; and a drying and curing step of drying and curing the heating element paste, thereby forming a solid heating element.