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

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...

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 realized, and the arsenic removal of the waste residue after disposal is not complete. There may still be traces of arsenic or other harmful elements in the waste residue. Disposal, rainwater leaching may still cause heavy metal pollution, so further disposal is still required

[0008] Currently, there are many researches on curing and stabilization methods, mainly including cement-based stabilization / curing method, lime-based stabilization / curing method, asphalt stabilization / curing method, thermal Plastic stabilization / curing method and glass stabilization / curing method, etc., but most of the existing methods are aimed at arsenic-containing neutralization slag with low arsenic content, and most of them have high leaching rate, expensive chemicals, and complicated operations. , the curing process is difficult to mix evenly, secondary pollution and other shortcomings

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