Method for Comprehensive Utilization of Sulfuric Acid Slag and Red Mud

Abstract

The invention discloses a method for utilizing sulfate slag and red mud comprehensively. The method comprises the steps that the sulfate slag and the red mud are mixed with a reducing agent so as to obtain a mixed material; roasting is carried out on the mixed material so as to obtain a reduced iron product; the reduced iron product is separated so as to obtain iron powder. By the utilization of the method, the two metallurgical solid waste resources, namely the red mud and the sulfate slag are utilized comprehensively, so that the iron product with good indexes is obtained.

Description

technical field [0001] The invention relates to the field of metallurgy, in particular to a method for comprehensively utilizing sulfuric acid slag and red mud. Background technique [0002] Red mud is the most important solid residue produced after alumina is extracted from bauxite. It is red because it contains a large amount of iron oxide, so it is called red mud. At present, the annual discharge of red mud in China exceeds 30 million tons. Except for a small part used in cement production and brick making, most of them are stored in wet open-air dams. Today, the accumulated stockpiles of red mud in China have exceeded 100 million tons. The stockpiling of red mud not only occupies a large amount of land, but also has high maintenance costs and increases the production cost of alumina; a large amount of strong alkali and high salinity waste lye seeps into nearby farmland, causing soil alkalization and swamping, and polluting surface and groundwater source, deteriorating t...

AI Technical Summary

Problems solved by technology

At present, high-iron red mud is generally used for recycling iron from red mud, while low-iron red mud cannot be directly used

[0004] Sulfuric acid slag is the waste residue produced in the process of producing sulfuric acid or sulfurous acid from pyrite, in which the content of TFe can reach 40%, and the highest can reach about ~60%; impurities are represented by SiO 2 Mainly, but also contains a small amount of CaO, MgO and Al 2 o 3 ; Although the iron content in the sulfuric acid slag is relatively high, because the content of the harmful element sulfur in the sulfuric acid slag is basically above 1% or even higher, and it is easy to enter the iron product during the smelting process, causing the iron product to be unusable, so sulfuric acid Slag has not been effectively developed and utilized

[0005] Therefore, the comprehensive utilization of red mud and sulfuric acid slag needs to be studied

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