Coarse-grain pre-selection and magnetic-flotation separation process of fine-grain embedded mixed ore
A technology of mixed ore and fine particles, which is applied in the direction of solid separation and grain processing, can solve the problems of large metal loss, high tailings grade, and increase the processing capacity of flotation operations, so as to reduce the dosage of chemicals, reduce the cost of beneficiation, and reduce the The effect of ore
Active Publication Date: 2017-11-03
ANSTEEL GRP MINING CO LTD
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[0007] In this process, the particle size of a mixed magnetic concentrate after regrinding reaches 85% to 90% of -325 mesh. A certain amount of magnetic ore in the product of this grinding particle size has been fully dissociated from the monomer, and the qualified grade magnetic ore can be obtained through magnetic separation. Concentrate, but the magnetite contained in the ore in the process has reached the monomer dissociation into the reverse flotation operation, which makes the consumption of chemicals in the flotation operation large, which increases the processing capacity of the flotation operation, and also Increased the dosage of flotation agents and beneficiation costs, resulting in some insufficiently mineralized fine-grained magnetic ore entering the tailings of flotation operations, resulting in high tailings grades and large metal loss.
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[0019] The specific implementation manner of the present invention will be further described below in conjunction with the accompanying drawings.
[0020] Such as figure 2 As shown, a kind of micro-grain embedded mixed ore coarse-grain pre-selection and magnetic-flotation separation process of the present invention is characterized in that it adopts "semi-self-grinding, wet pre-selection, continuous grinding, weak magnetic-strong magnetic, fine sieve and then Grinding, strong magnetic fine anion reverse flotation" operating system, the specific steps are as follows:
[0021] a) The raw ore with a grade of 31% to 33%, a magnetic iron content of 40 to 60%, and a particle size of less than 300mm is subjected to semi-autogenous grinding, and the product with a particle size of -3mm or less is put into wet pre-selection. The wet pre-selection adopts Wet weak magnetic pre-selection and wet strong magnetic pre-selection can throw away large-grained gangue and poor conglomerate with...
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The present invention relates to a process of coarse grain pre-selection and magnetic-flotation separation of fine-grain embedded mixed ore. "Magnetic precision reverse flotation" operating system, sorting the fine-grained mixed ore, and obtaining iron concentrate with a grade of 65%-65.5% and a yield of 35-40%. The advantages of the present invention are: wet pre-selection can throw out 15%~20% of qualified large-grained tailings under the condition of coarse-grained ore, and magnetic-flotation separation can be separated in advance to produce a yield of 15-20%, The magnetic ore with a grade above 65% reduces the amount of ore fed to the flotation operation, reduces the number of flotation machines, reduces the amount of chemicals, and reduces the cost of beneficiation.
Description
technical field [0001] The invention belongs to the technical field of iron ore beneficiation, in particular to coarse-grain pre-selection and magnetic-flotation separation process of fine-grain embedded mixed ore. Background technique [0002] In recent years, the domestic separation of lean iron ore has successfully adopted "continuous grinding, weak magnetic-strong magnetic-negative reverse flotation", "stage grinding, weak magnetic-strong magnetic-anion reverse flotation", "stage Grinding, coarse and fine classification, medium ore regrinding, heavy-magnetic-reverse flotation", "continuous grinding, coarse and fine classification, medium ore regrinding, heavy-magnetic-reverse flotation", "three-stage grinding, stage weak The magnetic-intensity magnetic-reverse flotation process has been promoted and applied in Anshan Iron and Steel Co., Ltd. and other domestic processing plants. [0003] These processes adopt three-stage crushing and screening of the raw ore, and the -1...
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IPC IPC(8): B02C21/00B02C23/14B03B9/00
Inventor 张丛香刘双安刘雁翎宋均利钟刚孟娜
Owner ANSTEEL GRP MINING CO LTD