Method for stabilizing arsenic-containing sludge by kaolin geopolymer

A technology of geopolymer and metakaolin powder, applied in cement production, solid waste management, sustainable waste treatment, etc., can solve the problems of high cost, unfavorable large-scale use by enterprises, etc., to enhance stability, reduce diffusion and harm , the effect of improving the compressive strength

Inactive Publication Date: 2020-04-07
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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 stabilizing arsenic-containing sludge by kaolin geopolymer
  • Method for stabilizing arsenic-containing sludge by kaolin geopolymer
  • Method for stabilizing arsenic-containing sludge by kaolin geopolymer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Example 1: The components of kaolin in this example are shown in Table 1. The arsenic-containing sludge comes from the sulfuric acid workshop of a zinc smelter in Southwest China after removing arsenic in wastewater by lime neutralization and precipitation. The main components are shown in Table 2 shown;

[0022] Table 1 Kaolin composition

[0023]

[0024] A method for stabilizing arsenic-containing sludge with kaolin polymer, the specific steps are as follows:

[0025] (1) Calcining kaolin at a temperature of 650°C for 6 hours to obtain metakaolin, ball milling metakaolin for 40 minutes, and sieving to obtain metakaolin powder; wherein the ball milling speed is 120 r / min, and the particle size of metakaolin powder is less than 0.45 mm;

[0026] (2) Add deionized water to metakaolin powder in step (1) and mix evenly to obtain mixture A; wherein the mass ratio of deionized water to metakaolin powder is 0.4:1;

[0027] (3) Under stirring conditions, add the alkali a...

Embodiment 2

[0035] Example 2: The components of kaolin in this example are shown in Table 4. The arsenic-containing sludge comes from the sulfuric acid workshop of a zinc smelter in Southwest China after removing arsenic in wastewater by lime neutralization and precipitation. The main components are shown in Table 5 shown;

[0036] Table 4 Kaolin composition

[0037]

[0038] A method for stabilizing arsenic-containing sludge with kaolin polymer, the specific steps are as follows:

[0039] (1) Calcining kaolin at a temperature of 550°C for 8 hours to obtain metakaolin, ball milling metakaolin for 80 minutes, and sieving to obtain metakaolin powder; wherein the ball milling speed is 80 r / min, and the particle size of metakaolin powder is less than 0.45 mm;

[0040] (2) Add deionized water to metakaolin powder in step (1) and mix evenly to obtain mixture A; wherein the mass ratio of deionized water to metakaolin powder is 0.3:1;

[0041] (3) Under stirring conditions, add the alkali ac...

Embodiment 3

[0049] Example 3: The cement composition of this example is shown in Table 7. The arsenic-containing sludge comes from the sulfuric acid workshop of a zinc smelter in Southwest China after removing arsenic in wastewater by lime neutralization and precipitation. The main components are shown in Table 8 shown;

[0050] Table 7 Kaolin composition

[0051]

[0052] A method for stabilizing arsenic-containing sludge with kaolin polymer, the specific steps are as follows:

[0053] (1) Calcining kaolin at a temperature of 600°C for 7 hours to obtain metakaolin, ball milling metakaolin for 60 minutes, and sieving to obtain metakaolin powder; wherein the ball milling speed is 100 r / min, and the particle size of metakaolin powder is less than 0.45 mm;

[0054] (2) Add deionized water to metakaolin powder in step (1) and mix evenly to obtain mixture A; wherein the mass ratio of deionized water to metakaolin powder is 0.35:1;

[0055] (3) Under stirring conditions, add the alkali act...

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Abstract

The invention relates to a method for stabilizing arsenic-containing sludge by a kaolin geopolymer, and belongs to the technical field of heavy metal pollution treatment. The method comprises the following steps: calcining kaolin to obtain metakaolin, ball-milling the metakaolin, and sieving the ball-milled metakaolin to obtain a metakaolin powder; adding deionized water into the metakaolin powder, and performing uniform mixing to obtain a mixture A; adding an alkali activator into the mixture A under a stirring condition, and performing uniform mixing to obtain a geopolymer slurry; uniformlymixing the geopolymer slurry with the arsenic-containing sludge to obtain a mixture B; and aging the mixture B at a temperature of 40-50 DEG C for 1-3 h, pouring the aged mixture B into a mold, molding the mixture B to obtain a molded block, demolding the molded block, and naturally curing the molded block for 7-28 d. The good plasticity and pressure resistance of the kaolin greatly enhane the compressive strength of the arsenic-containing solidified block and improve the stability of the arsenic-containing sludge, so the method has good market prospects.

Description

technical field [0001] The invention relates to a method for stabilizing arsenic-containing sludge with kaolin polymer, and belongs to the technical field of heavy metal pollution control. Background technique [0002] Arsenic can form highly toxic compounds. Arsenic can be absorbed by the human body through the respiratory tract, skin and digestive tract, causing neurasthenia syndrome, polyneuropathy, and skin and mucous membrane lesions. Arsenic's inorganic compounds can cause lung cancer and skin cancer. After the treatment of arsenic-containing wastewater, 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. [0003] At present, the treatment methods of arsenic-containing sludge include wet treatment, fire treatment and solidification treatment and other methods. Wet treatment has low energy consumption, low pollution, an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/00C04B18/04
CPCC04B18/0418C04B28/006C04B2201/50C04B14/106C04B22/002C04B12/04Y02W30/91Y02P40/10
Inventor 祁先进李雪竹祝星王华段孝旭
Owner KUNMING UNIV OF SCI & TECH
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