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

A technology of wall materials and white mud slag, applied in the direction of solid waste management, sustainable waste treatment, climate sustainability, etc., can solve the problems of energy consumption increasing production costs, high dispersion, product strength performance decline, etc., to achieve Reduced production costs, compact process layout, and electricity cost savings

Inactive Publication Date: 2005-11-23
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Example 1: Combination figure 1 , the first step: add 450kg of calcium carbide sludge containing water, 6.2kg of water reducer and 75kg of water into the mortar mixer, stir well and evenly, and the mixing time is 2 to 3 minutes. At this time, the white mud slag is plasticized into Uniform white mud slurry;

[0020] The second step: continue to add 450kg of fine yellow sand to the mixer, stir evenly, and stir for 2 to 3 minutes, and the mixing material obtained at this time is the base material;

[0021] The third step: add 450kg of fine yellow sand, 225kg of coarse aggregate and the base material obtained in the first step and the second step into another mixer at the same time, and stir for 2 to 3 minutes to prepare the mixture;

[0022] The fourth step: the prepared mixture is molded into silicate adobe under a pressure of 18MPa.

[0023] Step 5: Carry out autoclaving curing of the formed silicate bricks, specifically heating up for 2 hours, constant temperature and...

Embodiment 2

[0024] Example 2: Combining figure 2 , the first step: add 450kg of water-containing calcium carbide sludge into the mixer, fully stir evenly, and the stirring time is 2 to 3 minutes. At this time, the white mud slag is plasticized into a uniform white mud slag slurry;

[0025] The second step: continue to add 450kg of fine powder quartz to the mixer, stir evenly, and stir for 2 to 3 minutes, and the stirring material obtained at this time is the base material;

[0026] The third step: add 400kg of fine powder quartz, 375kg of coarse aggregate and the base material obtained in the first step and the second step to another mixer at the same time, and stir for 2 to 3 minutes to prepare the mixture;

[0027] The fourth step: the prepared mixture is formed into a silicate brick under a pressure of 19MPa;

[0028] Step 5: The molded silicate adobe is autoclaved and cured. Specifically, the temperature is raised for 2 hours, the constant temperature pressure is 1Mpa, the constant ...

Embodiment 3

[0029] Example 3: Binding image 3 , the first step: precipitation and concentration, because the calcium carbide mud slag mixture is a suspension with a high water content, it should be precipitated and concentrated to reduce the water content first, and the white mud slag solid content of the concentrated suspension should be measured;

[0030] Step 2: In the concentrated and precipitated white mud slag slurry, the mass ratio of white mud slag to fly ash is 1:0.8, and stirred evenly, and then the solid-liquid separation is carried out through a filter press, and the obtained filter residue can be used as a mixture the base of the material;

[0031] Step 3: Add the metered white mud slag and filter residue of silicon material and the remaining fly ash and aggregate into the mixer to make the brick adobe mixture, wherein the mass ratio of base material, fly ash and aggregate It is 1:0.5:0.4.

[0032] The fourth step: the prepared mixture is formed into silicate adobe under a...

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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 ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/04
CPCY02W30/91
Inventor 崔崇江金国张士华
Owner NANJING UNIV OF SCI & TECH
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