A magnesite beneficiation process with short process and avoiding overgrinding

Abstract

The invention relates to a magnesite beneficiation process with short flow and avoiding over-grinding, comprising: 1) the raw ore is graded once after adding water to the ore; 2) reverse flotation; 3) forward flotation; 4) once normal Flotation scavenging foam products, primary positive flotation selected underflow products and secondary positive flotation selected underflow products are fed into the classifier for the third classification, and the third graded sand settling is fed into the ball mill; the discharge of the ball mill and the overflow of the third classification are combined , to return to positive flotation roughing. The present invention adopts the combination of stage grinding, stage separation and positive and negative flotation, and after separation, the final qualified concentrate and tailings are produced; avoiding the large consumption of flotation agents and difficult separation caused by over-grinding of magnesite and other problems, to achieve high-efficiency recovery of magnesite, greatly improve the recovery rate of magnesite, and reduce the energy consumption of grinding; the use of new agents to achieve reverse flotation can basically remove all silicon in one roughing, and realize normal temperature flotation, shortening The beneficiation process greatly reduces heat energy consumption and can effectively reduce environmental pollution.

Description

technical field [0001] The invention relates to the technical field of mineral processing, in particular to a magnesite mineral processing process with short flow and avoiding overgrinding. Background technique [0002] Although my country's natural magnesite resources are very rich, after decades of mining, commercial-grade magnesite has become less and less, especially high-grade magnesite can no longer meet production needs, while low-grade magnesite Magnesite cannot be directly used in the production of high-grade products, especially a large amount of extra-grade magnesite cannot be utilized, resulting in a waste of magnesite resources. [0003] At present, most of the first-grade magnesite is mined and used. According to statistics, in the total proven reserves, the ore above the first grade only accounts for 20% of the total reserves. The fine ore (particle size <40mm) produced during the mining process It accounts for less than 30% of the mined ore. Because the ex...

AI Technical Summary

Problems solved by technology

The above technical process has the following disadvantages: First, the continuous grinding process is adopted, which leads to over-grinding of magnesite, increases energy consumption, increases the cost of ore dressing, and reduces the recovery rate of magnesite; second, reverse flotation adopts multiple stages, resulting in too long , the beneficiation process is complex

Images