Technique for treating pyrile cinder

Abstract

A process for treating the sulfuric acid dregs generated by preparing sulfuric acid from troilite concentrate includes such steps as delivering said sulfuric acid dregs via a sealed pipeline into a water sealed water pool, quick cooling, primary magnetic separating by a weak magnetic field (1100-1200 Oc), secondary magnetic separating by another weak magnetic field (1000-1100 Oc), and final separation of tailings by the third weak magnetic field (1200-1500 Oc) or a shaking table. It has high recovery rate of Fe ore.

Description

technical field [0001] The invention relates to a sulfuric acid slag processing method for recovering raw materials suitable for ironmaking from solid waste slag (sulfuric acid slag for short) after sulfuric acid is produced from pyrite concentrate. Background technique [0002] Because sulfuric acid slag is the solid waste after producing sulfuric acid from pyrite, in the past, it was mostly stored in remote places or sent to cement plants as additives. In recent years, due to the rapid development of the iron and steel industry and the international and domestic iron ore Due to strong demand and high price, sulfuric acid slag has attracted widespread attention because of its high iron content and its ability to be processed as raw material for ironmaking. [0003] The sulfuric acid slag in various places has different properties due to the differences in the acid production process and pyrite composition. Some sulfuric acid slags have high iron grades and can be directly u...

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Problems solved by technology

[0005] However, due to the high temperature of the sulfuric acid slag coming out of the sulfuric acid production device from pyrite, generally between 900°C and 1000°C, the iron-containing substances in the sulfuric acid slag are easily oxidized at high temperatures, and the minerals containing strong magnetic magnetite The main black sulfuric acid slag turns into dark red hematite slag, the magnetism is greatly weakened, and the magnetic separation effect is reduced

In the prior art, due to high temperature oxidation, the sulfuric acid slag contains more hematite, and some technicians suggest that the sulfuric acid slag containing more hematite be magnetized and roasted to convert the hematite into a strong magnetic Magnetite; this method obviously increases energy consumption, but the recycling rate of magnetic separation has not been significantly improved

[0006] The sulfuric acid slag treatment method in the above prior art, due to some inherent shortcomings of itself, the obtained iron concentrate is difficult to fully meet the basic requirements of the iron-making process requiring more than 60% iron; at the same time, the recovery of some of the above methods The utilization rate is low, resulting in a waste of resources, which can no longer meet the actual needs of the majority of manufacturers

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