Method for curing arsenic-containing sludge by using copper slag/cement composite cementing material

A technology of composite cementitious material and cement, which is applied in fixed/solidified sludge treatment, chemical instruments and methods, water/sludge/sewage treatment, etc. The effect of increasing compressive strength, reducing diffusion and damage, and enhancing stability

Inactive Publication Date: 2020-11-17
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The Portland cement method is often used in the curing method, but the cost of this method is relatively high, which is not conducive to large-scale use by enterprises

Method used

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  • Method for curing arsenic-containing sludge by using copper slag/cement composite cementing material
  • Method for curing arsenic-containing sludge by using copper slag/cement composite cementing material
  • Method for curing arsenic-containing sludge by using copper slag/cement composite cementing material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Example 1: The copper slag in this example is taken from a smelter in Yunnan, and the main components are shown in Table 1; the cement is from a factory, and the main components are shown in Table 2; the arsenic-containing sludge comes from the sulfuric acid workshop of a zinc smelter in Southwest China The sludge obtained after removing arsenic in wastewater by lime neutralization and precipitation method has main components as shown in Table 3;

[0019] Table 1 Composition of copper slag

[0020]

[0021] Table 2 Cement composition

[0022]

[0023] Table 3 Sludge Composition

[0024]

[0025] A method for solidifying arsenic-containing sludge with copper slag / cement composite cementitious material, the specific steps are as follows:

[0026] (1) after copper slag and cement are ground respectively, cross 200 mesh sieves to obtain copper slag powder and cement powder;

[0027] (2) Step (1) copper slag powder and cement powder are mixed uniformly to obtain ...

Embodiment 2

[0036] Example 2: The copper slag in this example is taken from a smelter in Yunnan, the main components are shown in Table 5; the cement is from a factory, and the main components are shown in Table 6; the arsenic-containing sludge is from the sulfuric acid workshop of a zinc smelter in Southwest China The sludge obtained after removing arsenic in wastewater by lime neutralization and precipitation method has main components as shown in Table 7;

[0037] Table 5 Copper slag composition

[0038]

[0039] Table 6 Portland cement composition

[0040]

[0041] Table 7 Sludge Composition

[0042]

[0043] A copper slag / cement composite cementitious material solidifies arsenic-containing sludge, and the specific steps are as follows:

[0044] (1) Portland cement and blast furnace slag are ground and passed through a 300-mesh sieve to obtain Portland cement powder and blast furnace slag powder;

[0045] (2) Mix the Portland cement powder and blast furnace slag powder in ...

Embodiment 3

[0054]Example 3: The copper slag in this example is taken from a smelter in Yunnan, and the main components are shown in Table 9; the cement is from a factory, and the main components are shown in Table 10; the arsenic-containing sludge comes from the sulfuric acid workshop of a zinc smelter in Southwest China The sludge obtained after removing arsenic in wastewater by lime neutralization and precipitation method has main components as shown in Table 11;

[0055] Table 9 copper slag composition

[0056]

[0057] Table 10 Cement composition

[0058]

[0059] Table 11 Sludge Composition

[0060]

[0061] A method for solidifying arsenic-containing sludge with copper slag / cement composite cementitious material, the specific steps are as follows:

[0062] (1) Portland cement and blast furnace slag are ground and passed through a 300-mesh sieve to obtain Portland cement powder and blast furnace slag powder;

[0063] (2) Mix the Portland cement powder and blast furnace s...

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Abstract

The invention relates to a method for curing arsenic-containing sludge by using a copper slag / cement composite cementing material, and belongs to the technical field of heavy metal pollution treatment. The preparation method comprises the following steps: uniformly mixing copper slag powder and cement to obtain a mixture A; under a stirring condition, adding the mixture A into deionized water, anduniformly mixing to obtain a mixture B; uniformly stirring and mixing the mixture B and arsenic-containing sludge to obtain a mixture C; and aging the mixture C for 1-3 hours at a temperature of 40-50 DEG C, pouring the aged mixture C into a mold, molding to obtain a molded block, demolding the molded block, and naturally curing for 7-28 days. According to the invention, the copper slag containsa large amount of Si element, the consistency of the gel can be optimized, the compressive strength of the arsenic-containing solidified block is increased, and the stability of the arsenic-containingsludge is improved.

Description

technical field [0001] The invention relates to a method for solidifying arsenic-containing sludge with a copper slag / cement composite gelling material, and belongs to the technical field of heavy metal pollution control. Background technique [0002] At present, after the treatment of arsenic-containing wastewater by existing technologies, most of the harmful substances such as arsenic are transferred to the sludge. Therefore, the research on the safe treatment and disposal of arsenic-containing sludge has important practical significance. Copper slag is the slag produced in the copper smelting process, which is a kind of non-ferrous metal slag. Copper slag is composed of Fe, Si, O and other elements. my country is a big consumer of copper ore resources, and the consumption of copper is very large. ~3t slag, the amount of copper slag is large, and it is of great significance to develop the resource utilization technology of copper-containing slag. [0003] The treatment me...

Claims

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Application Information

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IPC IPC(8): C04B28/04C02F11/00C02F101/10C02F101/20
CPCC04B28/04C02F11/008C02F2101/103C02F2101/20C04B2111/00784C04B2201/50C04B18/144C04B18/0418
Inventor 祁先进李雪竹王华杨妮娜卢治旭段孝旭
Owner KUNMING UNIV OF SCI & TECH
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