A beneficiation process for processing refractory mixed iron ore containing various iron minerals

Abstract

The invention relates to a mineral processing technology for processing mixed iron ore difficult to separate and with various iron minerals. The mineral processing technology is characterized in thatraw ore with iron grade being of 21-23% and particle size being of 250mm-0mm is fed in a self-grinding machine to obtain a self-grinding product with the particle size being of 30mm-0mm, the self-grinding product is fed in a double-layer linear vibrating screen to obtain three kinds of screened products with the particle sizes separately being of +10mm, 10mm-1mm and 1mm-0mm, and the three kinds ofscreened products are subjected to different grading processing of grind grading, dry magnetic separation, wet magnetic separation and reverse flotation operation to obtain ore with concentrate gradebeing more than 64.5%. The mineral processing technology has the advantages that (1), through introduction of a high-pressure grinding roller closed circuit crushing autogenous mill stone, capacity of the autogenous mill is released; (2), a novel rotary kiln structure with chemical reaction and reduction reaction being conducted step by step is adopted, and the percent conversion of the magneticore is improved; and (3), compared with an original technology, the concentrate grade is improved by nearly 5 percentage points.

Description

technical field [0001] The invention belongs to the technical field of mineral processing, and in particular relates to a beneficiation process for processing refractory mixed iron ores containing various iron minerals. Background technique [0002] Although the reserves of iron ore resources in my country are considerable, their remarkable characteristics are poor, fine and miscellaneous, that is, there are many low-grade lean ores, complex ore composition, fine particle size of useful minerals, few rich ores, and difficult to select iron ore. Mostly ore. At present, domestic concentrators mostly use "stage grinding, coarse and fine separation-gravity, magnetic and floating combined process" to process mixed iron ore mainly composed of hematite, and to process mixed iron ore mainly composed of lean magnetite. Iron ore is sorted by "single magnetic separation process" or "magnetic-flotation joint process", such as figure 1 shown. [0003] The raw ore processed by a concent...

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Problems solved by technology

[0003] The raw ore processed by a concentrator in a certain area is hematite ore, but with the increase of stope mining depth, the ore properties gradually change, and the useful minerals in iron ore change from the original single Fe 2 o 3 Iron minerals changed to Fe-rich 3 o 4 、FeCO 3 , Fe 2 o 3 Mixed iron ore of various iron minerals, with FeCO 3 and Fe 3 o 4 content increased, the original single grinding and flotation process of the concentrator could not meet the requirements of ore property changes, a large amount of iron ore could not be effectively recovered, and various technical indicators dropped rapidly, the grade of iron concentrate was less than 60%, and the quality of iron concentrate Cannot meet market requirements

[0004] According to the research on the properties of the ore, it is found that the particle size of various iron minerals in the mixed iron ore is not uniform, and the strong magnetic mineral Fe 3 o 4 The particle size is relatively coarse, and the monomer dissociation can be achieved when the grinding particle size is relatively coarse; FeCO 3 , Fe 2 o 3 Weak magnetic minerals need to be ground to more than 95% of -200 mesh to achieve 95% of monomer dissociation, and FeCO 3 , Fe 2 o 3 The symbiotic relationship between weakly magnetic minerals and gangue minerals is complex

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