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 technology for recovering raw materials suitable for ironmaking from solid waste residues (sulfuric acid slags for short) obtained from pyrite concentrates. Background technique [0002] Because sulphuric acid slag is the solid waste slag produced by pyrite sulphuric acid, in the past, it was mostly used directly to find remote storage or to send a small amount to cement plants as additives. In recent years, due to the rapid development of the iron and steel industry and international and domestic iron ore With strong demand and high price, sulphuric acid slag has received widespread attention due to its higher iron content and its ability to be processed as raw materials for ironmaking. [0003] Due to the differences in the acid production process and pyrite composition of the sulphuric acid slag in various places, the properties of various sulphuric acid slag are different. Some sulphuric acid slag...

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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 process in the above prior art, due to some inherent shortcomings of itself, the iron concentrate obtained 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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