Efficient environment-friendly type beneficiation method for low-grade magnetic mirror iron ores

Abstract

The invention discloses an efficient environment-friendly type beneficiation method for low-grade magnetic mirror iron ores. The efficient environment-friendly type beneficiation method is characterized in that iron ore concentrate which meets smelting requirements is obtained by adopting processes such as raw material three-stage crushing, large particle medium-magnetism and SLon strong-magnetismpre-selection, one-stage ore grinding and grading, one-stage weak magnetic-selecting and one-stage SLon strong magnetic-selecting, pre-grading and two-stage ore grinding and grading, two-stage weak magnetic-selecting and two-stage SLon strong magnetic-selecting and SL centrifugal machine selecting operation for the magnetic mirror iron ores. The efficient environment-friendly type beneficiation method can throw 21% of coarse-particle barren rocks through high-pressure roller-grinding, large-particle medium-magnetism pre-selecting and SLon strong-magnetism pre-selecting, and meets the beneficiation principle of preferably crushing instead of grinding and throwing as early as possible. A selecting process of roughing, cleaning and scavenging of a centrifugal machine is adopted, so that re-selecting operation completely replaces reverse flotation operation, and therefore, the efficient environment-friendly type beneficiation method is a pollution-free beneficiation method, is high in degree of automation, is great in processing amount, is liable to realize field operation and implementation, and greatly reduces manual operation.

Description

technical field [0001] The invention relates to a beneficiation method of mixed iron ore, in particular to a new high-efficiency and environment-friendly beneficiation method of low-grade refractory magnetite and specularite mixed ore. Background technique [0002] After entering the 21st century, my country is the world's largest steel producer, consumer, and net exporter. Steel plays an irreplaceable role in the national economy, and qualified iron concentrate powder is the raw material for steel smelting. Although my country's iron ore resources are rich and widely distributed, there are many lean ores, few rich ores, many co-associated components, fine particle size, and high beneficiation costs. Compared with the rich ores in Australia, Brazil, South Africa, and India, there is no cost competition. Advantages, my country needs to import iron ore from abroad for a long time, and the price and supply are subject to the monopoly of international mining giants. Among the pr...

AI Technical Summary

Problems solved by technology

However, specularite belongs to the complex trigonal scalenohedral crystal type, and specularite has a special crystal structure, and when it is mixed with magnetite, it is difficult to use conventional beneficiation methods for efficient and environmentally friendly recycling.

[0004] In recent years, the latest beneficiation process of magnetite and specularite mixed ore is: crushing-stage grinding-weak magnetic separation-(gravity separation)-strong magnetic separation-(selective flocculation desliming)-reverse flotation operation; On the one hand, the reverse flotation process is used to improve the grade of iron ore concentrate. The reverse flotation process has high production costs and seriously pollutes the environment. The beneficiation index is greatly fluctuated by other factors, which not only greatly increases the production cost, but also pays a huge price. environmental cost

On the other hand, the crushing process usually adopts coarse crushing-intermediate crushing-fine crushing to -12mm ball mill. After fine crushing, there is no pre-selection and tailing operation for the product, and a large amount of qualified waste rock enters the ball mill, and the grinding cost accounts for about 60% of the total beneficiation cost. This increases the operating cost of the ball mill and the load of subsequent mineral processing operations, which ultimately increases the discharge of tailings and seriously shortens the safety and life of the tailings pond

Images