Method for finely grinding and separating fine grain iron ore

A technology for fine-grained iron ore, applied in chemical instruments and methods, solid separation, wet separation, etc., can solve the problem that it is difficult to achieve fine-grained mineral refinement and dissociation, ordinary horizontal ball mills cannot obtain satisfactory results, and minerals are easy to It can improve the efficiency of energy utilization, improve the degree of monomer dissociation, and simplify the equipment.

Inactive Publication Date: 2011-07-20
CHANGSHA RES INST OF MINING & METALLURGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The current mining industry uses ordinary horizontal ball mills as fine grinding equipment for fine-grained iron ore coarse abrasives. There are the following deficiencies in the application of grinding: 1) It is difficult to achieve the refinement and dissociation of fine-grained minerals; 2) When the grinding fineness reaches the size of mineral dissociation, useful minerals are easy to muddy, resulting in loss of useful minerals; 3) High energy consumption during fine grinding
It can be seen that ordinary horizontal ball mills cannot obtain satisfactory results no matter in terms of energy consumption or mineral dissociation.

Method used

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  • Method for finely grinding and separating fine grain iron ore

Examples

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Embodiment 1

[0015] a kind of like figure 1 The fine grinding and sorting method of the fine-grained iron ore of the present invention as shown comprises the following steps: first, a certain fine-grained iron ore in Hunan (it is a mixed ore of magnetite and hematite, and magnetite is used as Main) rough concentrate (the iron grade of the rough concentrate is 36%, particle size D 80 84μm) mixed with water to make a pulp with a mass concentration of 60%, and the pulp flows into the vertical stirring mill (the vertical stirring mill uses a rod stirrer) through the feeder (or high-level tank, etc.) for vertical grinding The fine grinding of the vertical stirring mill, the vertical stirring mill is filled with steel balls with a diameter of 6mm to 12mm, the filling amount is 2 / 3 of the cylinder volume of the vertical stirring mill, and the rotating speed of the vertical stirring mill is controlled at 250r / min, the discharged material is stirred evenly and pumped into the hydrocyclone for clas...

Embodiment 2

[0017] a kind of like figure 1 The fine grinding and sorting method of the fine grained iron ore of the present invention as shown, comprises the following steps: first, the anti-floating tailings (the anti-floating tailings) of a certain micro-fine iron ore (which is mainly magnetite) in Baotou Grade 29%, particle size D 80 100μm) mixed with water to make a slurry with a mass concentration of 65%, the slurry flows into the vertical stirring mill (the vertical stirring mill uses a disc agitator) through the high-level tank for fine grinding, and the mill is filled with 20mm ~30mm steel balls, the filling amount is 2 / 3 of the cylinder volume of the vertical stirring mill, the rotating speed of the vertical stirring mill is controlled at 400r / min, and the output is pumped into the hydrocyclone for classification, classification After the underflow and the pulp are combined, the fine grinding of the vertical mixer is carried out again, and the classification overflow is used as ...

Embodiment 3

[0019] a kind of like figure 1 The fine grinding and sorting method of the fine-grained iron ore of the present invention as shown, comprises the following steps: first, a certain fine-grained embedded iron ore in Xinjiang (it is the mixed ore of magnetite and hematite, and with magnetite Ore-based) coarse concentrate (grain size D 80 60μm) to make a slurry with a mass concentration of 65%, pump the slurry into a vertical stirring mill (the agitator of the vertical stirring mill uses a spiral agitator) for fine grinding, and fill the vertical stirring mill with 15mm ~25mm steel balls, the filling amount is 2 / 3 of the cylinder volume of the vertical agitating mill, the speed of the vertical agitating ball mill is controlled at 120r / min, the discharged material is stirred evenly, and pumped into the centrifugal classifier for classification, After the grading underflow is merged with the pulp, it will be put into the vertical stirring mill again, and the grading overflow will e...

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Abstract

The invention relates to a method for separating iron ore, and in particular discloses a method for finely grinding and separating fine grain iron ore. The method comprises the following steps of: preparing 30 to 70 mass percent ore pulp from the fine grain iron ore, feeding into a vertical stirring grinder for fine grinding, discharging a finely-ground material, adding into a fine grain classifier for classifying, returning classified bottom flow to prepare the pulp, adding into the vertical stirring grinder for the fine grinding again, and performing magnetic separation or magnetic suspension united separation on classified overflow so as to obtain iron ore concentrate. By finely grinding and separating the fine grain iron ore by the method, the grade and the recovery rate of the iron ore concentrate can be obviously improved, and ore separating cost can be lowered.

Description

technical field [0001] The invention relates to a mineral processing method of iron ore, in particular to a fine grinding and separation method of fine iron ore. Background technique [0002] The mineral resources available for development and utilization in my country tend to be poor, fine, and miscellaneous, and the fine-grained refractory iron ore accounts for 20% to 25% of my country's iron ore resource reserves. -37μm is greater than 95%; Hunan Qidong Iron Mine and Dongkou Iron Mine have a particle size of -20μm greater than 98% or finer. And the high-phosphorus hematite to be developed has a particle size of 15 μm and more than 90%. This type of ore minerals have fine particle size, complex structure, and extremely difficult mineral processing. Generally, it needs to go through stage grinding-stage separation to obtain qualified iron concentrates. To obtain high-grade and high-recovery iron concentrates, Then the iron ore must be fully dissociated through fine grindin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B03B7/00B03B1/00
Inventor 张国旺肖骁李自强赵湘肖守孝黄礼龙
Owner CHANGSHA RES INST OF MINING & METALLURGY
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