Method of preparing high-strength silicate wall material by utilizing chemical white sludge

Abstract

The invention discloses a method of preparing high-strength silicate wall material by utilizing chemical white sludge which comprises the steps of, charging siliceous raw material into white sludge grout by the weight ratio of 1:1-0.25, agitating homogeneously, then charging aggregate accounting to 30-50 wt% of total mixture and remaining portion siliceous raw material, stirring to obtain mixture, press forming, curing the unfired brick, and maintaining through pressured stream. The chemical white cement slag being calcium carbide slag and chlorohydrin epoxypropane white cement slag, the siliceous raw material being fine yellow sands, fine konilite or coal ash.

Description

1. Technical field [0001] The invention relates to a method for preparing a novel high-strength wall material by using chemical waste as a main raw material, in particular a method for preparing a high-strength silicate wall material by using chemical white mud slag. 2. Background technology [0002] There are many kinds of white mud products produced in my country's chemical production, and its main component is Ca(OH) 2 At present, the typical environmental impacts are: the white mud slag produced by the preparation of propylene oxide by the chlorohydrin method; the main pollutants produced in the production process of PVC resin by the calcium carbide method are calcium carbide sludge; the production of polyvinyl alcohol (PVA) by the calcium carbide acetylene method ), fiber (vinylon) process produces a large amount of calcium carbide sludge. The chemical white mud slag discharged by chemical enterprises in our country is as high as millions of tons every year, which has ...

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Problems solved by technology

The traditional autoclaved (hydrothermal synthesis reaction) silicate wall material preparation process uses lime as the calcareous material, and needs to be equipped with lime grinding process and lime digestion process. The equipment includes ball mill, crusher, feeder, Belt conveyor, continuous lime digestion bin, corresponding civil engineering workshop, high production cost of the original process

In terms of composition, chemical white mud slag is a calcareous material that is very suitable for hydrothermal synthesis reactions, but the chemical white mud slag after dehydration by pressure filtration still has about 40% to 50% of water, and chemical white mud slag is due to Contains a large amount of digested calcium oxide, high dispersion, high viscosity, and difficult to mix evenly. If no treatment is taken to directly mix the white mud slag with the dry siliceous raw material, it will easily form spherical particles of different sizes. The outside of the white mud slag ball Covered with a hard siliceous raw material shell, the calcareous material and the siliceous material cannot fully react, and the strength performance of the product is reduced. At the same time, dehydration requires a lot of energy consumption and increases the production cost, thus limiting the application of chemical white mud slag.

At present, there have been many scientific research institutions in China engaged in research work in this area. The way to use it is to use white mud slag as digested lime for construction mortar, but it is difficult to popularize and apply this technology. The main defect is the dehydration of white mud slag. At the same time, calcium hydroxide reacts with carbon dioxide during the drying process, carbonizes and loses the function of lime, and at the same time, the high energy consumption of dehydration increases the production cost

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