Beneficiation method for iron increase and impurity reduction of low-grade iron ore powder

Abstract

The invention relates to a beneficiation method for iron increase and impurity reduction of low-grade iron ore powder. The method comprises the following steps that firstly, water is added into iron ore powder to be subjected to stirring and slurry mixing, suspension ore slurry is achieved, and flowing is facilitated; secondly, a hydrocyclone is adopted for carrying out grading and concentrating in advance, sand setting is carried out for ore grinding, overflowing is carried out, and the sorting procedure is executed; thirdly, the hydrocyclone carries out overflow to carry out weak magnetic roughing, weak magnetic selection and weak magnetic scavenging, and high-grade weak magnetic concentrates are obtained; fourthly, weak magnetic scavenging tailings are subjected to screening and slag separating, and impurities are removed; fifthly, minus sieve ore slurry after slag separating is subjected to strong magnetic roughing and strong magnetic scavenging, and a strong magnetic separation concentrate is obtained; sixthly, the strong magnetic separation concentrate is subjected to grading and concentrating through the hydrocyclone, sand setting is carried out for ore grinding, overflowingis carried out, and the sorting procedure is executed; and seventhly, hydrocyclone carries out overflow, a spiral chute is adopted for roughing and selection, and the spiral chute concentrate can beobtained.

Description

technical field [0001] The invention relates to a beneficiation method for extracting iron and reducing impurities from low-grade iron ore powder, and belongs to the technical field of iron ore beneficiation. Background technique [0002] In the field of iron ore beneficiation, the commonly used technological processes for iron ore extraction and impurity reduction include stage grinding-stage separation, stage grinding-magnetic separation-fine screen, stage grinding-strong magnetic separation-weak magnetic separation-gravity separation, and The process of improving the grade of iron concentrate through magnetization roasting, grinding and re-selection. [0003] The original roasting-magnetic separation process concentrate iron grade of Jiuquan Iron and Steel Concentrator is about 56.5%, SiO 2 +Al 2 o 3 The content is about 11%. After the cationic reverse flotation process was adopted, the grade of iron concentrate reached 60.56%, an increase of 4 percentage points, an...

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Problems solved by technology

[0004] The current technical problem is that iron concentrate SiO 2 The content is more than 4%, the highest reaches more than 10%, and rarely drops below 4%. The reverse flotation process used needs to add four agents such as collector, inhibitor, activator, and regulator, and steam Heating will increase the cost of beneficiation. At the same time, due to the high viscosity of the foam, it is difficult to defoam, and a large amount of high-pressure water needs to be consumed for defoaming. The quality of the surrounding water is poor, the concentration of suspended solids is high, and it is difficult to recycle, which affects environmental protection indicators. Therefore, there is an urgent need for a A new solution to this technical problem

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