Dearsenization method for sulfurous iron ore slag

Abstract

The invention relates to a dearsenization process for sulfurous iron ore slag, which comprises the following steps: stirring the sulfurous iron ore slag in a sulfuric acid water solution for 0.5 to 2.5 hours at a temperature of between 20 and 50 DEG C; and obtaining refined sulfurous iron ore slag with arsenic content less than 0.07 percent after separation and washing, wherein the dearsenization rate is between 96 and 98 percent. The process has the characteristics of simple processing process, short processing time, easy operation, high arsenic removal rate and the like. Because production equipment used by the process has low cost and excellent performance, the process has strong market competitiveness and promotion and application values.

Description

technical field [0001] The invention belongs to the field of solid waste treatment in the chemical industry, and specifically relates to a method for removing arsenic from pyrite slag. Background technique [0002] Pyrite slag is the solid waste produced when pyrite is calcined to produce sulfuric acid. The annual output is about 15 million tons, accounting for 1 / 3 of the entire chemical waste slag. The main element is iron. It is usually treated properly such as magnetic separation It can meet the raw material requirements of ironmaking and can be used as ironmaking raw material, but because pyrite slag contains arsenic, copper, zinc, lead and other impurity elements that are unfavorable to ironmaking, its application is limited. The arsenic removal treatment of pyrite slag can reduce the arsenic content in the slag and make it meet the quality requirements of ironmaking raw materials, which can not only make up for the shortage of iron resources in my country, but also eli...

AI Technical Summary

Problems solved by technology

[0004] Dearsenization by fire process refers to the volatilization of arsenic in the form of arsenic trioxide through oxidation-reduction reaction in a high-temperature furnace, or dearsenization by roasting with alkali and leaching with water. Or by adding a weak acid salt weaker than arsenic acid, roasting, and water leaching to remove arsenic. This method has the advantages of convenient method, simple equipment, low cost, and no environmental pollution. It is suitable for the removal of arsenic from high-arsenic solid materials. However, this type of method consumes a lot of energy, and the depth of arsenic removal is limited.