Anshan-type hematite silicon-control benefication method

Abstract

The invention relates to an Anshan-type hematite silicon-control benefication method. The Anshan-type hematite silicon-control benefication method is characterized by comprising three crushing times, screening, ball-milling classification and two reselection times, and includes particular steps of crushing, to be more specific, performing rough crushing, intermediate crushing, fine crushing and screening operation on Anshan-type hematite on working faces so that more than 90% of products have the particle sizes of 0-12mm; feeding the crushed and screened products into ball-mill and involute cyclone assemblies to be subjected to closed-circuit grinding, and classifying the crushed and screened products according to the thicknesses of the crushed and screened products; feeding flow which flows from thickness classification cyclones into roughing spiral chutes and concentration spiral chutes, and secondarily reselecting the flow to obtain ultimate concentrates with 65%-65.5% of iron and 5%-5.5% of SiO<2>. The Anshan-type hematite silicon-control benefication method has the advantages that technical processes are simple, technical and economic indexes are good, the grade of the iron concentrates is reduced from the original 67% and is 65.5%, but the contents of iron in tailings at the grade is reduced from the original 9.5% and is 9%, the recovery rate of the iron is increased by 1 percent, the yield is increased by 1.5 percents, the contents of the SiO<2> are effectively controlled and are 5%-5.5%, and excellent economic benefits can be acquired in follow-up sintering and smelting procedures.

Description

technical field [0001] The invention belongs to the technical field of ferrous metal beneficiation, in particular to a method for beneficiating Anshan-style hematite silicon-controlled minerals. Background technique [0002] my country is the world's largest steel producer and iron ore consumer. With the sustained and rapid economic development, the problem of resource shortage has become increasingly prominent. At present, two-thirds of iron ore needs to be imported, but at the same time there are problems such as low utilization efficiency of iron ore resources (less than 70%) and serious waste. Therefore, it is urgent to improve resource utilization efficiency. [0003] Anshan-type iron ore is a typical iron ore in my country. At present, the ore dressing technology of Angang and other units has made great progress, laying the foundation for Anshan Iron and Steel to obtain a high grade of 67% in beneficiation. [0004] After Anshan Iron and Steel increased iron and redu...

AI Technical Summary

Problems solved by technology

[0005] Therefore, too low silicon content (below 4.5%) not only deteriorates the economics of the concentrator, but also makes downstream sintering difficult

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