Arsenic-containing neutralization slag solidifying and stabilizing agent and method for solidifying and stabilizing arsenic-containing neutralization slag by using same

A stabilizer and curing agent technology, which is applied in the direction of cement production, etc., can solve the problems of unrealized final disposal, difficulty in mixing uniformly in the curing process, complicated operation, etc., and achieve harmless disposal, good curing effect, and easy popularization and application Effect

Inactive Publication Date: 2015-04-29
云南省环境科学研究院(中国昆明高原湖泊国际研究中心)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005]1. The energy consumption is large. Since the volatilization temperature of arsenic is 800-1100°C, it is necessary to add fuel to realize the volatilization of arsenic, so as to achieve the arsenic-containing waste slag. Harmful disposal purposes, so the energy consumption is higher
[0006] 2. Secondary pollution is heavy. Arsenic will inevitably be removed from the flue gas in the form of a small amount of dust during the incineration process of neutralized slag containing arsenic. In addition, a large amount of Existence of fluorine and sulfur elements, if effective tail gas treatment is not adopted, will inevitably cause gaseous pollutants such as fluoride and SO2 to exceed the standard, resulting in air pollution. Waste or desulfurization waste liquid increases the difficulty and cost of subsequent treatment
[0007]3. The final disposal has not been r...

Method used

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  • Arsenic-containing neutralization slag solidifying and stabilizing agent and method for solidifying and stabilizing arsenic-containing neutralization slag by using same
  • Arsenic-containing neutralization slag solidifying and stabilizing agent and method for solidifying and stabilizing arsenic-containing neutralization slag by using same
  • Arsenic-containing neutralization slag solidifying and stabilizing agent and method for solidifying and stabilizing arsenic-containing neutralization slag by using same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Raw material 1: neutralized slag containing arsenic

[0041] The main components of the arsenic-containing neutralization slag are shown in the following table:

[0042] Table 1 Analysis results of chemical composition of arsenic-containing neutralization slag in a factory

[0043]

Embodiment approach

[0045] The method for solidifying and stabilizing the neutralized slag containing arsenic in the present embodiment (process flow chart is as follows figure 1 shown) includes the following steps:

[0046] (1) Naturally air-dry the arsenic-containing neutralized slag and then go through a ball mill for ball milling before use. The particle size of the arsenic-containing neutralized slag is less than or equal to 2mm;

[0047] (2), take by weighing the raw material in the ratio of cement 50%, fly ash 30%, lime 9% and ferrous sulfate 11% by weight percentage of each composition in the curing stabilizing agent;

[0048] (3), mix the arsenic-containing neutralization slag and the solidification stabilizing agent according to the ratio of 52%: 48%, and stir to obtain the mixed dry material; then add 30% water of the mixed dry material to the mixed dry material, After stirring for 10-15 minutes, the mixture is obtained and sent to the brick making system for molding;

[0049] (4) The...

Embodiment 2

[0055] Raw material 2: neutralized slag containing arsenic

[0056] The main components of the arsenic-containing neutralization slag are shown in the following table:

[0057] Table 3 Analysis results of chemical composition of arsenic-containing neutralization slag in a factory

[0058]

[0059] method of execution:

[0060] The method for solidifying arsenic-containing neutralization slag in the present embodiment (process flow chart is as follows figure 1 shown) includes the following steps:

[0061] (1) Naturally air-dry the arsenic-containing neutralized slag and then carry out ball milling treatment in a ball mill for later use. The particle size of the arsenic-containing neutralized slag is ≤2mm;

[0062] (2) take the raw material according to the ratio of cement 48%, fly ash 35%, lime 6% and ferrous sulfate 11% by weight percentage of each composition in the curing and stabilizing agent;

[0063] (3) Mix the arsenic-containing neutralization slag and the curi...

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Abstract

The invention relates to an arsenic-containing neutralization slag solidifying and stabilizing agent and a method for solidifying and stabilizing arsenic-containing neutralization slag by using the same, belonging to the technical field of hazardous waste treatment and disposition. The arsenic-containing neutralization slag solidifying and stabilizing agent is composed of a stabilizing agent A and a solidifying agent B, wherein the stabilizing agent A is composed of lime and ferrous sulfate, and the solidifying agent B is composed of cement and fly ash. The arsenic-containing neutralization slag solidifying and stabilizing agent is composed of the following components in percentage by weight: 40-60% of cement, 15-35% of fly ash, 5-10% of lime and 6-15% of ferrous sulfate. The arsenic-containing neutralization slag solidifying and stabilizing agent has favorable solidifying effect for the heavy metal arsenic in the neutralization slag, and the arsenic leaching rate after solidification can satisfy related requirements in GB5085.3-2007. All the raw materials are conventional raw materials and reagents which are cheap and accessible, so the agent cost is lower, thereby greatly lowering the disposition cost of the arsenic-containing neutralization slag.

Description

technical field [0001] The invention belongs to the technical field of hazardous waste treatment and disposal, and in particular relates to a solidification and stabilization agent for arsenic-containing neutralization slag and a method for solidifying and stabilizing arsenic-containing neutralization slag. Background technique [0002] Arsenic belongs to a class of heavy metal pollutants, and its trivalent oxide, arsenic, is a highly toxic chemical substance. my country's mineral mining, smelting, chemical and chemical industries will produce a large amount of arsenic-containing waste residues. As the current application of arsenic is limited in many fields, the disposal and utilization rate of arsenic-containing waste residues is extremely low. At present, most arsenic-containing waste residues are disposed of by simply stacking or landfilling, which poses a great pollution and threat to the environment. Among the many arsenic-containing waste residues, the typical one is...

Claims

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Application Information

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IPC IPC(8): C04B28/08C04B7/26
CPCY02P40/10
Inventor 吴学勇张涛牛学奎尚江涛周曼毕廷涛王统
Owner 云南省环境科学研究院(中国昆明高原湖泊国际研究中心)
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