A sorting process of specularite fine ore

Abstract

The invention belongs to the technical field of ore dressing and particularly relates to a specularite dust ore dressing technology. The specularite dust ore dressing technology is characterized by comprising an ore grinding and grading system and a magnetic separation and dressing system. The grade of input raw ore is 33%, and the granularity is 0-15 mm. The specularite dust ore dressing technology comprises specific steps that firstly, specularite dust ore passes through two segments of continuous closed circuits for grinding until specularite is dissociated from gangue monomers, wherein the ball mill-cyclone-fine screen closed circuit is adopted for each segment of ore grinding; the products of which the grading size is 0.074 mm, the grade is 33% and the productivity is 100% in the two segments of closed circuits for grinding are fed into a medium-intensity magnetic separator, a roughing vertical-ring high-intensity magnetic separator, a concentration vertical-ring high-intensity magnetic separator, a roughing flat-ring high-intensity magnetic separator, a concentration vertical-ring high-intensity magnetic separator and two segments of scavenging flat-ring high-intensity magnetic separators for magnetic separation. The grade of final iron ore concentrate can be improved to 50%-52%, and the recovery rate can be increased to 70%-72%. Accordingly, economic benefits of a dressing plant are greatly increased, and the loss of iron resources is lowered.

Description

technical field [0001] The invention belongs to the technical field of iron ore beneficiation, in particular to a specularite fine ore separation process. Background technique [0002] The Jiayuguan area of ​​Gansu Province in my country is rich in specularite ore, and the ore industry types in this area are mainly specularite ore, specularite-siderite mixed ore and specularite-limonite mixed ore. Specularite and limonite are a kind of hematite, which have weak magnetic properties and can be directly selected. Higher field strength is required to separate them by magnetic separation. In order to separate specularite, the method of reduction roasting to reduce the oxidation degree of iron minerals in the ore is usually used to increase the magnetic properties of specularite, and then the method of weak magnetic separation is used to separate specularite. This method can make specularite The concentrate grade is increased to about 60%, and the recovery rate can reach up to 80...

AI Technical Summary

Problems solved by technology

However, due to the small pores of 0-15mm fine ore after crushing specularite ore, it cannot be used for reduction roasting, so this part of specularite ore is mostly treated as waste rock and is not selected, even if the grade of the final iron concentrate is only 45%- 47%, the recovery rate is generally lower than 60%, the grade is low, the recovery rate is low, and the economic benefit is poor

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