Method for preparing geopolymer by utilizing waste acid sludge

A technology of geopolymer and polluted acid residue, applied in cement production and other directions, can solve problems such as waste of resources and water pollution of Xiangjiang River, and achieve the effects of low cost, easy engineering implementation and simple preparation process

Active Publication Date: 2015-01-21
BEIFANG UNIV OF NATITIES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This has led to serious pollution of the water body of the Xiangjiang River and a great waste of resources, especially the piled up solid waste such as heavy metal polluted acid waste residues. The storage yard covering an area of ​​nearly 100 acres is shocking. There are major safety hazards, and there is an urgent need to develop reduction and harmless treatment. use of industrial technology

Method used

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  • Method for preparing geopolymer by utilizing waste acid sludge
  • Method for preparing geopolymer by utilizing waste acid sludge
  • Method for preparing geopolymer by utilizing waste acid sludge

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] First, the dirty acid slag and modified magnesium slag are mechanically ground to a particle size below 40 mesh, and then the dirty acid slag is mixed with the modified magnesium slag. The weight ratio of the dirty acid slag to the modified magnesium slag is 4:6, and the mixed slag Mix with bauxite according to the weight ratio of 7:3, add the alkali activator NaOH solution (mass concentration 40%) after mixing and water glass solution (mass concentration 20%), the quality of this NaOH solution and water glass solution all accounts for Prepare 8% of the total mass (referring to the sum of the weight of polluted acid slag, magnesium slag and bauxite), and prepare a mixture with a total amount of 5Kg.

[0028] Pour the mixed material into a 40mm×40mm×160mm triple mold, let it stand at room temperature for 1 day, demould it, and put it in a cement standard curing box for curing. The curing temperature is 80°C and the relative humidity is 85%. After 4 hours of curing, After...

Embodiment 2

[0035] The polluted acid slag (chemical composition as shown in Table 1) and modified magnesium slag (chemical composition as shown in Table 2) are mechanically ground to a particle size below 40 mesh; then the polluted acid slag is mixed with the modified magnesium slag, The weight ratio of the modified magnesium slag is 3:7, the mixed slag and bauxite are mixed according to the weight ratio of 6:4, and the alkali activator NaOH (mass concentration 30%) and water glass (mass concentration 30%) are added, and NaOH The quality of water glass and water glass all account for 7% of the total mass of the preparation (referring to the sum of the weight of dirty acid slag, magnesium slag and bauxite), and the total amount of preparation is 5Kg of the mixture.

[0036] Pour the mixed material into a 40mm×40mm×160mm triple mold, let it stand at room temperature for 1 day, demould it, and put it in a cement standard curing box for curing. The curing temperature is 75°C, and the curing ti...

Embodiment 3

[0042] The polluted acid slag (chemical composition as shown in Table 1) and modified magnesium slag (chemical composition as shown in Table 2) are mechanically ground to a particle size below 40 mesh; then the polluted acid slag is mixed with the modified magnesium slag, The weight ratio of the modified magnesium slag is 2:8, the mixed slag (weight ratio) and bauxite are mixed according to the weight ratio of 8:2, and the alkali activator NaOH and water glass are added, NaOH (mass concentration 30%) and water glass (mass concentration 25%) accounted for 10% of the total mass of the preparation (referring to the sum of the weight of polluted acid slag, magnesium slag and bauxite), and the total amount of preparation was 5Kg of the mixture. Pour the mixed material into a 40mm×40mm×160mm triple mold, let it stand at room temperature for 1 day, demould, put it in a standard curing box for curing, the curing temperature is 70°C, after 5 hours of curing time, the relative humidity i...

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Abstract

The invention relates to a method for preparing geopolymer by utilizing waste acid sludge. The method is characterized by comprising the following steps: mixing waste acid sludge powder, modified magnesium slag powder and bauxitic clay powder, wherein the weight ratio of the waste acid sludge to the modified magnesium slag is 1:1-3, and the addition amount of bauxitic clay accounts for 20%-60% by weight of the total mixed powder; then mixing a NaOH solution with the mass concentration of 20-50% and a water glass solution with the mass concentration of 5-50% according to the volume ratio of 3:1-3, then pouring into the above mixed powder, uniformly stirring, and then pouring a die for molding; and finally demolding and maintaining. The provided processing method is clean and environment-friendly, is applicable to solidify heavy metal Cd in the waste acid sludge, and is low in cost. The preparation technology is simple, does not need high-temperature sintering, does not employ expensive materials, is easy to construct, and is suitable for industrialized production.

Description

technical field [0001] The invention relates to a method for preparing geopolymers by using polluted acid slag. Background technique [0002] Non-ferrous metal smelting is a heavily polluting industry that plays a pivotal role in my country's economic development. However, the long-term accumulation of waste residues in the non-ferrous metal smelting industry has led to serious pollution of groundwater, posing major safety hazards, and severely restricting the sustainable development of the non-ferrous metal industry. Two types of society" construction. [0003] The lead and zinc industry is an important representative of non-ferrous metal smelting in my country. The bulk industrial solid waste in my country's lead and zinc industry mainly comes from metallurgical slag and acidic water treatment slag (polluted acid slag), and the annual industrial waste slag is estimated to exceed 6 million tons. Taking Zhuzhou Qingshuitang Industrial Zone as an example, various industrial ...

Claims

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Application Information

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IPC IPC(8): C04B28/00C04B7/24
CPCY02P40/10
Inventor 韩凤兰吴澜尔陈玉洁杜春
Owner BEIFANG UNIV OF NATITIES
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