Mineral processing process of low-grade micro-fine particle embedded iron ore hard to choose

A fine-grained, low-grade technology, applied in the direction of solid separation, wet separation, chemical instruments and methods, etc., can solve the problems of high iron grade in tailings, low recovery rate of iron concentrate, and low grade iron in concentrate. The effect of reducing the dosage of chemicals, shortening the flotation process and improving the recovery rate

Inactive Publication Date: 2014-07-23
CHANGSHA RES INST OF MINING & METALLURGY
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Problems solved by technology

[0006] The technical problem to be solved by the present invention is aimed at the ore property characteristics of low-grade fine-grained refractory iron ore at home and abroad and the existing low-grade complex refractory iron ore beneficiation process with low concentrate iron grade and tailings iron grade. High iron concentration, low recovery rate of iron concentrate, etc., propose a beneficiation process of low-grade fine-grained refractory iron ore with simple and stable production operation, high recovery rate and grade of iron concentrate, low cost, and less dosage of chemicals

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  • Mineral processing process of low-grade micro-fine particle embedded iron ore hard to choose

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Embodiment 1

[0031] A beneficiation plant for refractory iron ore has an annual processing capacity of 300,000 t / year. The iron minerals in the ore in the area have a fine particle size, and the magnetite belongs to the category of fine-grained to fine-grained particles, and the particle size is mostly between 0.01 and 0.03 between mm; while hematite is distributed in the gangue in a fine disseminated shape, with the characteristics of fine particles to extremely fine particles, except for a few particles that can reach about 0.04mm, the particle size of most particles is distributed between 0.002mm and Between 0.03mm. use as figure 1 The beneficiation process of the low-grade micro-grain embedding refractory iron ore of the present invention as shown, specifically comprises the following steps:

[0032] (1) One-stage grinding and grading: After the raw ore is crushed to <12mm, it first passes through a closed-circuit grinding and grading system for one-stage grinding and grading, and the...

Embodiment 2

[0041] A beneficiation plant for refractory iron ore has an annual processing capacity of 2 million t / year. The iron minerals in the ore are mainly hematite and magnetite, followed by semi-false to false hematite, and occasionally sporadic limonite Distribution; gangue minerals are mainly quartz, followed by feldspar, chlorite, sericite, actinolite and apatite. The magnetite in the ore in the area belongs to the category of fine-grained to fine-grained embedded distribution, and the particle size is mostly between 0.01mm-0.03mm, and some are 0.04mm-0.15mm, which belongs to the category of fine-grained embedded distribution; while hematite is crystal The particle size is very small, and the particle size distribution of most particles is between 0.002mm and 0.01mm, which belongs to the category of extremely fine particle embedded cloth. use as figure 1 The beneficiation process of the low-grade micro-grain embedding refractory iron ore of the present invention as shown, specif...

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Abstract

The invention discloses a mineral processing process of low-grade micro-fine particle embedded iron ore hard to choose. The process comprises the following steps that first ore grinding and staged treatment is carried out firstly, settled sand is retuned to be ground again, second ore grinding and staged treatment is carried out on overflow, the settled sand is returned to a system to be ground again, the overflow enters a weak magnetic-strong magnetic system, low intensity magnetic separation treatment is carried out firstly, strong magnetic separation is carried out on tailings after the low intensity magnetic separation many times after concentration and residue separation, rough concentrates obtained through the strong magnetic separation are combined with rough concentrates after the low intensity magnetic separation, three-stage ore grinding and staged treatment is carried out, the settled sand is returned to be ground again, selective flocculation desliming operating is carried out on the overflow many times, the low intensity magnetic separation is carried out on the deslimed settled sand to obtain weak magnetic concentrates, weak magnetic tailings are concentrated and enter in reverse flotation operating to obtain reverse flotation concentrates, and reverse flotation foam enters the weak magnetic-strong magnetic system for direct strong magnetic separation treatment. The process has the advantages of being easy, convenient and stable to operate, high in iron ore concentrate recovery rate and grade, low in cost, small in the number of adopted agents and the like.

Description

technical field [0001] The invention relates to a beneficiation process for iron ore, in particular to a beneficiation process for low-grade fine-grained embedded iron ore. Background technique [0002] In recent years, the rapid development of my country's national economy has driven the sustained and rapid growth of my country's iron and steel industry, which has led to a sharp increase in iron ore consumption. Economic development urgently needs to rely on technological progress to maximize the use of my country's limited iron ore resources, thereby increasing the self-sufficiency rate of domestic iron ore and reducing the dependence of my country's iron and steel industry on imported ore. [0003] The main characteristics of my country's iron ore are "poor", "fine" and "miscellaneous". The average iron grade is only 32%, which is about 11 percentage points lower than the world average iron grade. 97% of iron ore iron content is below 30%. , it needs to be processed by mi...

Claims

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Application Information

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IPC IPC(8): B03B7/00
Inventor 严小虎陈雯李家林唐雪峰张立刚廖振鸿
Owner CHANGSHA RES INST OF MINING & METALLURGY
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