An energy-saving process for processing extremely poor hematite wet pre-selection coarse concentrate

Abstract

The invention relates to an energy saving process for treating extremely lean hematite wet type preselection rough concentrates. The energy saving process is characterized by comprising the following steps: (1) feeding the wet type preselection rough concentrates into a high-frequency dewatering screen for grading and dewatering work; (2) directly feeding sieve residues of the high-frequency dewatering screen into a primary ball mill; (3) feeding an ore discharge product of the primary ball mill into a section of permanent magnet low intensity magnetic separation machine and a section of high intensity magnetic separation machine for magnetic separation, and combining a section of high intensity magnetic tailings, a section of low intensity magnetic concentrates and a section of high intensity magnetic concentrates to obtain a mixed magnetic concentrate product; (4) combining an undersize product of the high-frequency dewatering screen, and feeding into a concentrator for concentration work, feeding a bottom flow product obtained by the concentration work into a primary grading hydrocyclone through a mineral feeding pump pond for grading, then performing coarse and fine grading work, and respectively performing separation on a coarse grain product, of 200 meshes, with the particle size of 40 to 45 percent and a fine grain product with the particle size of 85 to 90 percent. According to the energy saving process for treating the extremely lean hematite wet type preselection rough concentrates, the ore milling energy consumption of the ball mill is reduced, and the power energy consumption and the subsequent ore milling and grading amount of the primary grading hydrocyclone equipment are also reduced; therefore, the mineral separation energy consumption is further reduced, and the mineral separation efficiency is improved.

Description

technical field [0001] The invention belongs to the technical field of mineral processing, and in particular relates to an energy-saving process for processing extremely poor hematite wet pre-selection rough concentrate. Background technique: [0002] At present, the processing of extremely poor hematite ore in the concentrator usually adopts coarse-grained wet pre-selection process. In this process, the extremely poor hematite ore with a grade of about 22% after coarse crushing is first fed into the semi-autogenous mill, and the semi-autogenous mill After the ore discharge is fed into a linear vibrating screen with a screen hole size of 2 mm for screening, the product on the screen is returned to the semi-autogenous mill, and the product under the linear vibrating screen with a particle size of 2-0 mm is fed into a wet pre-selection weak magnetic separator to obtain a grade of About 44% coarse-grained weak magnetic concentrate; the tailings of the pre-selected weak magnetic...

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Problems solved by technology

The particle size of the wet coarse concentrate in the original process is 2-0 mm. The results of the analysis of its particle size composition show that the cumulative yield of the 0.5-0 mm particle size products in the pre-selected concentrate reaches 75%-80%. The -0.076mm (i.e. -200 mesh) particle size yield of mineral products is more than 35%. This part of the product is put into the first-stage grinding and classification operation, which not only increases the processing capacity of a ball mill and classification operation, but also the fine particles in this part of the product It is easy to cause over-grinding of high-grade products after regrinding, which will affect the sorting effect of subsequent sorting operations and reduce the metal recovery rate; at the same time, due to the low concentration of pre-selected coarse concentrate products in the original process, the concentration is only about 30% and the concentration value Large fluctuations, the wet pre-selected coarse concentrate is directly fed into the pump pool of the primary classifying cyclone, which makes it difficult to operate the primary classifying cyclone equipment stably, which not only affects the classification effect and reduces the classification efficiency, but also when the primary classifying cyclone sand When the concentration is low, returning it to the primary ball mill causes a low primary grinding concentration, which will seriously affect the grinding efficiency of the primary mill, thereby increasing the energy consumption of grinding

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