Siliceous plastic refractory and preparation method thereof

Abstract

The invention relates to a siliceous plastic refractory and a preparation method thereof. According to the technical scheme, the method comprises the steps that under the water bath condition, urea resin, polyacrylamide, carboxymethylcellulose, polyethylene glycol 200 and water are stirred to obtain a binding agent; quartzite, silica powder, silicon carbide and dolomite are mixed and ground till the granularity is not larger than 80 micrometers, under the condition that the pressure is 20-30 MPa, compression molding is performed, thermal treatment is performed at the air atmosphere under the temperature of 1,300-1,450 DEG C, materials obtained after thermal treatment are crushed and screened to obtain a material A with the granularity being 3-4 mm, a material B with the granularity being 1-2 mm, a material C with the granularity being 0.088-0.5 mm and a material D with the granularity being not larger than 80 micrometers; the four materials with the different granularities and silicon nitride powder are mixed to obtain a mixed homogenous material; the binding agent is added into the mixed homogenous material to be mixed to be uniform, and the siliceous plastic refractory is obtained. The siliceous plastic refractory has the advantages of being low in cost and simple in technology, and the obtained siliceous plastic refractory is long in hardening time and large in volume density and strength.

Description

technical field [0001] The invention belongs to the field of plastic technology. In particular, it relates to a siliceous plastic and a preparation method thereof. Background technique [0002] Plasticable is a kind of unshaped refractory material prepared by preparing granular and powdery materials in a certain proportion and introducing a binder. Its main characteristic is to maintain high plasticity for a long time. According to the hardening method, the plastic can be divided into two types: air hardening and thermosetting, and according to the different aggregate materials, it can be divided into silicon, magnesium, clay and high alumina. [0003] "A hard plastic and its preparation method" (CN201010158430.8) patent technology discloses a hard plastic for CDQ ovens, mainly made of SiC, mullite and siliceous micropowder (less than 2200 mesh) As raw materials, aluminum phosphate and phosphoric acid are used as binders, and packaged after mixing, extruding, and cutting. ...

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Problems solved by technology

[0003] "A hard plastic and its preparation method" (CN201010158430.8) patent technology discloses a hard plastic for CDQ ovens, mainly made of SiC, mullite and siliceous micropowder (less than 2200 mesh) As raw materials, aluminum phosphate and phosphoric acid are used as binders, and packaged after mixing, extrusion, and blank cutting. The main disadvantage of this technology is that the hardening speed of phosphate or phosphoric acid is fast, and it cannot be stored for a long time, which reduces the plasticity of plastics.

[0004] "A long-life phosphoric acid bonded high-alumina plastic and its preparation method" (CN201310004596.8) patented technology, which mainly improves the hardening speed of the phosphoric acid binder by introducing a corrosion inhibitor and prolongs the hardening time of the plastic, but its The main disadvantage is that the plastic strength and other properties are poor