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Classification grinding separation process for preselected coarse-grained concentrate of lean hematite

A technology of hematite and concentrate, which is applied in the classification and grinding process of pre-selection of coarse-grained concentrate of lean hematite, which can solve the problem of too fast wear of the grit chamber and the failure to guarantee the particle size of the overflow product, which affects the separation Problems such as normal operation

Pending Publication Date: 2021-05-18
鞍钢集团矿业设计研究院有限公司
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There is a problem in the specific production: due to the relatively coarse particle size of the pre-selected coarse-grained concentrate, a section of the conventional hydrocyclone grit outlet wears too fast, and the particle size of the overflow product cannot be guaranteed, which affects the normal operation of subsequent sorting operations.

Method used

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  • Classification grinding separation process for preselected coarse-grained concentrate of lean hematite

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Embodiment

[0020] Such as figure 1 As shown, a kind of lean hematite pre-selection coarse-grained concentrate classification grinding process of the present invention, the poor hematite grade that is 25.56% is given to the coarse-grained wet pre-selection process after coarse crushing, specifically through the semi-autogenous mill Closed-circuit grinding composed of a linear vibrating screen with a screen hole size of 3 mm. The under-screen product with a particle size of 3-0 mm is separated in two consecutive stages by a wet pre-selection weak magnetic separator and a wet pre-selection strong magnetic separator. The pre-selected coarse-grained tailings with a grade of 7.86% and a yield of 22.67% can be obtained with a grade of 30.75% and a pre-selected coarse-grained concentrate with a concentration of 22.8%. , stage grinding, and stage strong magnetic tailing-reverse flotation process, which specifically include the following steps:

[0021] Step 1. Feed the pre-selected coarse-graine...

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Abstract

The invention relates to a classification grinding separation process for preselected coarse-grained concentrate of lean hematite. The process comprises the step of feeding the lean hematite with the grade of 24%-26% into a coarse grain wet type preselection process to obtain the preselected coarse grain concentrate. The process is characterized in that a pre-grading, stage grinding and stage strong magnetic tailing discarding-reverse flotation process is adopted in subsequent treatment, specifically, the process specifically comprises the following steps that 1, the pre-selected coarse grain concentrate is fed into a flat-bottom concentration grading cyclone to be graded in advance, and pre-graded settled sand and pre-graded overflow are obtained; 2, the pre-graded settled sand is fed into a first-section ball mill, and the pre-graded overflow is directly fed into a secondary cyclone; and 3, second-stage bulk concentrate is subjected to reverse flotation, and final flotation concentrate with the grade being 65%-66% and the yield being 25%-27% is obtained through one-time roughing, one-time concentration and three-time scavenging. The process has the advantages that: 1, the concentration requirement of the first-stage mill is met, and the production is stable; and 2, fine grain products are graded in advance, the load of a first-stage mill is reduced, the energy is saved, and the consumption is reduced.

Description

technical field [0001] The invention belongs to the technical field of beneficiation technology of lean iron ore, and in particular relates to a grading and grinding process of pre-selecting coarse-grain concentrate of lean hematite. Background technique [0002] A concentrator adopts the process of "coarse-grained wet pre-selection, stage grinding, stage strong magnetic tailing-reverse flotation" to process a kind of extremely poor hematite ore. Among them, in this process, firstly, the poor hematite ore with a grade of 24%~26% after coarse crushing is fed into the semi-autogenous mill, and the ore discharged from the semi-autogenous mill is fed into a linear vibrating screen with a sieve size of 3 mm. , the products on the sieve are returned to the semi-autogenous mill, the products under the linear vibrating screen with a particle size of 3-0 mm are fed into the wet pre-selection weak magnetic separator, and the tailings of the pre-selected weak magnetic separator are fed...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B03B7/00B03B9/00B04C9/00B03C1/30
CPCB03B7/00B03B9/00B04C9/00B03C1/30
Inventor 吴文红柴青平刘太合胡键陈宇李万兴李天舒
Owner 鞍钢集团矿业设计研究院有限公司
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