Stabilizing agent for repairing arsenic slag and application method of stabilizing agent

An application method and stabilization technology, applied in the field of stabilization agents for repairing arsenic slag, can solve the problems of unsuitability for large-scale production, unsatisfactory repair effect, cumbersome repair process, etc., so as to reduce the number of mechanical shifts and reduce the risk of leaching. , The effect of the treatment process is feasible

Inactive Publication Date: 2020-02-04
GUANGXI BOSSCO ENVIRONMENTAL PROTECTION TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method converts arsenic into stable scorodite, which greatly reduces the risk of entry and exit. However, this method can only be reacted in the liquid phase, and the arsenic in the arsenic slag needs to be oxidized and leached first. The process is complex and not suitable for large-scale production.
[0009] To sum up, the current arsenic slag solidification / stabilization repair method still needs to solve the problems of cumbersome repair process, expensive chemicals, low utilization rate, and unsatisfactory repair effect.

Method used

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  • Stabilizing agent for repairing arsenic slag and application method of stabilizing agent

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Experimental program
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Effect test

Embodiment 1

[0040] The test samples were taken from the arsenic slag left over from an abandoned arsenic factory in Wenshan Prefecture, Yunnan. The restoration steps are as follows:

[0041] 1) Preparation method of stabilizing agent

[0042] Calcium oxide and polyferric sulfate are mixed and then ground and pulverized by a ball mill. The mass ratio of calcium oxide and polyferric sulfate is 1:1, and the specific surface area of ​​the finished product is 17.2m 2 / g, the mesh number is 800 mesh, and the moisture content is ≤0.3%;

[0043] 2) Application method of stabilizing agent for repairing arsenic slag

[0044]First air-dry the arsenic slag / arsenic-contaminated soil until the moisture content is ≤15%, and then use mobile crushing and screening equipment to crush to a particle size of ≤10mm to obtain a slag pile; then add 12% (based on slag heap dry basis mass), and use a crushing and screening bucket to mix the agent and the slag heap evenly; then add clear water to the slag heap wi...

Embodiment 2

[0046] The test samples were taken from the arsenic slag left over from an abandoned arsenic factory in Wenshan Prefecture, Yunnan. The restoration steps are as follows:

[0047] 1) Preparation method of stabilizing agent

[0048] Calcium oxide, polyferric sulfate, and polyferric aluminum sulfate are mixed and then ground and pulverized by a ball mill. The mass ratio of calcium oxide, polyferric sulfate and polyferric aluminum sulfate is 1:0.6:0.6, and the specific surface area of ​​the finished product is 14.6m 2 / g, the mesh number is 700 mesh, and the moisture content is ≤0.3%;

[0049] 2) Application method of stabilizing agent for repairing arsenic slag

[0050] First air-dry the arsenic slag / arsenic-contaminated soil to a moisture content of ≤15%, and then use mobile crushing and screening equipment to crush to a particle size of ≤10mm to obtain a slag heap; then add 8% (based on slag heap dry basis mass), and use a crushing and screening bucket to mix the agent and th...

Embodiment 3

[0052] The test samples were taken from the arsenic slag left over from an abandoned arsenic factory in Wenshan Prefecture, Yunnan. The restoration steps are as follows:

[0053] 1) Preparation method of stabilizing agent

[0054] Calcium oxide and polyferric sulfate are mixed and then ground and pulverized by a ball mill. The mass ratio of calcium oxide to polyferric sulfate is 0.7:1, and the specific surface area of ​​the finished product is 17.4m 2 / g, the mesh number is 650 mesh, and the moisture content is ≤0.3%;

[0055] 2) Application method of stabilizing agent for repairing arsenic slag

[0056] Air-dry the arsenic slag / arsenic-contaminated soil to a moisture content of ≤15%, and then crush it to a particle size of ≤10mm with mobile crushing and screening equipment to obtain a slag heap; then add 9% (based on slag heap dry basis mass), use the crushing and screening bucket to mix the agent and the slag heap evenly; then add clear water to the slag heap with the agen...

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Abstract

The invention discloses a stabilizing agent for repairing arsenic slag and an application method of the stabilizing agent. The stabilizing agent is prepared by mixing a pH regulator and a high molecular polymer stabilizer according to a mass ratio of (0.5-1.5):1 and carrying out grinding and crushing. When the stabilizing agent is used for repairing arsenic slag, the arsenic slag to be repaired isfirstly air-dried and crushed, the stabilizing agent is added into the arsenic slag according to a mass of 3-12% in dry basis of the arsenic slag, uniform mixing is carried out, then water is added into the arsenic slag until the water content is 30-35%, uniform mixing is carried out, curing is carried out for 1-5 days, and then the arsenic slag is subjected to landfill after being detected to bequalified. Raw materials for preparing the stabilizing reagent are cheap and are easy to obtain, preparation cost is low, the repairing method is simple in process, the treatment capacity is large, and repairing efficiency is high. The stabilizing agent can be applied to large-scale repairing tasks of plots with different pollution degrees.

Description

technical field [0001] The invention belongs to the technical field of hazardous solid waste treatment, and in particular relates to a stabilizing agent for repairing arsenic slag and an application method thereof. Background technique [0002] Arsenic trioxide, commonly known as "arsenic", is an important chemical raw material widely used in metallurgy, glass manufacturing, pesticides, medicine and other industries. A number of township arsenic smelting enterprises have sprung up across the country, relying on the local method of calcining realgar ore to produce arsenic trioxide. Generally, the arsenic content in realgar ore is 15% to 30%. According to statistics, 6 to 8 tons of ore need to be calcined to produce one ton of arsenic trioxide, and 80% of it will be discarded in the form of slag. [0003] At present, the arsenic slag treatment technologies in my country mainly include solidification / stabilization repair method, chemical leaching repair method, calcination met...

Claims

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Application Information

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IPC IPC(8): A62D3/33C09K17/40B09C1/08A62D101/43C09K101/00
CPCA62D3/33A62D2101/43B09C1/08C09K17/40C09K2101/00
Inventor 杨崎峰朱红祥周永信宋海农覃当麟谢湉廖长君刘松豪张涛苏建曹斐姝黄强曾睿
Owner GUANGXI BOSSCO ENVIRONMENTAL PROTECTION TECH
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