Grinding and separating process for producing pellet ore raw material fine iron powder

Abstract

The invention relates to a grinding and separating process for producing pellet ore raw material fine iron powder. The grinding and separating process is characterized by comprising the following steps: the fineness of a first-stage graded overflow product is increased to be more than or equal to 70%; and first-stage magnetic separation concentrate is treated through the following process steps that 1, coarse and fine grading is conducted, specifically, the first-stage magnetic separation concentrate is divided into undersize products and oversize products through a high-frequency fine screen; 2, the undersize products are treated through a JCTN refining and impurity reducing magnetic separator, and second-stage magnetic separation concentrate I is obtained; and 3, the oversize products are treated through second-stage closed circuit grinding and second-stage magnetic separation operation II to obtain second-stage magnetic concentrate II, and second-stage magnetic separation concentrate I and the second-stage magnetic separation concentrate II are combined to obtain fine iron powder. Compared with the prior art, the method has the advantages that: 1) the fine iron powder meets the pellet requirements, the grade TFe is larger than or equal to 67%, the fineness -0.074 mm particle content is larger than or equal to 90%, and 2) excessive grinding is reduced, the metal recovery rate is increased, energy is saved, consumption is reduced, and the production cost is reduced.

Description

technical field [0001] The invention belongs to the technical field of beneficiation technology in the iron and steel metallurgical industry, and in particular relates to a grinding and beneficiation process for producing fine iron powder as raw material of pellets. Background technique [0002] Blast furnace concentrates have always been an important policy for blast furnace ironmaking in my country. As a high-quality raw material for blast furnace ironmaking, pellets can better meet the requirements of blast furnace concentrates than sintered ore. The energy consumption of the pelletizing process is only 50% of the energy consumption of the sintering process. %, so the quality and performance of pellets are more and more valued by the industry. Due to the advantages of pellet ore, my country is currently vigorously producing high-quality pellet ore, increasing the proportion of high-quality pellet ore into the furnace, and improving the quality of ironmaking. However, high...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a grinding process for the production of pelletized ore raw material iron concentrate powder, which meets the requirements of high grade (TFe≥67%), high fineness (-0.074mm≥90 %), and at the same time solve the problems of difficult quality assurance, serious over-grinding, and high production cost of iron concentrate powder for pelletizing

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