Method of multiple selecting iron from pyrite sintered slag

Abstract

A process for separating iron from the sintered slag of troilite includes such steps as dressing said sintered slag to obtain concentrated iron powder and coarse dregs, natural depositing of said coarse dregs in deposition pool, clarifying the deposit suspension, draining supernatant, and separating concentrated iron powder frmo tailings again.

Description

technical field [0001] The invention relates to a mineral processing method for extracting fine iron ore powder from the waste residue after producing sulfuric acid from iron sulfate ore as a raw material, in particular to a mineral processing method for repeatedly extracting fine iron ore powder. Background technique [0002] At present, the annual production scale of pyrite acid production in my country is more than 13 million tons, and the by-product slag is nearly 13 million tons. Because low- and medium-grade pyrite is generally used as raw materials in China, the iron content of the slag produced At about 30%, it cannot be directly used in the iron and steel industry. There are a few enterprises in China that use pyrite slag to a certain extent, but the economic benefits are poor. Most of them are stored or discarded as a kind of waste slag, causing serious environmental pollution. In order to solve this problem, some will burn Slag is used as an additive in cement pla...

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Problems solved by technology

[0003] 1. Magnetization roasting-magnetic separation method adopted by Zhanjiang Chemical Plant: This method is to roast sulfur-containing ore in a certain reducing atmosphere, so that the discharged slag is black magnetic slag, that is, Fe 3 o 4 , and then use the magnetic separation method to recover the fine iron powder in the slag. The disadvantage of this method is that the pyrite slag must be in the form of Fe 3 o 4 Otherwise, the refined iron powder cannot be recovered; another disadvantage is that the sulfur cannot be fully oxidized due to roasting in a reducing atmosphere, so that the sulfur content of the selected refined iron powder is as high as 1.5%, which does not meet the requirements of the ironmaking and steelmaking process. ;

[0004] 2. Wet gravity separation: In this method, the pyrite slag is first ball-milled into powder, and then washed on a shaking table. The advantage of this method is that the process is simple, and the slag with strong or weak magnetic Sorting, the refined iron powder selected by it can be used in ironmaking and steelmaking process, but it also has imperfect process flow, large equipment investment, high energy consumption, high processing cost, large floor area and utilization of tailings Difficulty, the iron in the pyrite slag cannot be fully recovered;

[0005] In order to overcome the shortcomings of the above-mentioned technologies, the applicant applied to the State Intellectual Property Office in 2001 with the patent application number 01107345.4 for a "jigging machine selection of sulfuric acid slag process", which was the first time that the equipment of the jig was introduced into the iron selection process , this process is to sort the sulfuric acid slag through a jig in the state of water flow, and naturally settle in the sedimentation tank to obtain refined iron slag. Although it solves the problems of the above-mentioned technology, after several years of practice, it is found that There are also shortcomings such as imperfect technological process, insufficient iron selection, and poor comprehensive economic benefits;

[0006] The applicant also noticed that the Chinese Patent Office has disclosed a "low-grade pyrite slag iron separation process" with the announcement number CN1029459C. This method includes several steps of screening, spiral separation, grinding, and magnetic separation. Its advantage is that it can select high-quality refined iron powder, but because the slag must be screened first, and only those that meet the pore size requirements are sorted, which will inevitably prevent the iron in the pyrite slag from being separated. be fully recovered, in addition, there are disadvantages of high energy consumption and complicated operation

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