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A beneficiation process for producing chemical-grade chromite concentrate

A technology for chromite and concentrate, which is applied in the field of beneficiation and recovery of high-grade chromite ore, can solve the problems of interference with magnetic separation and shaking table separation effect, large differences in physical properties, and low chromite content, etc. The effect of improving the beneficiation efficiency, simple process and high recovery rate of concentrate

Inactive Publication Date: 2019-12-03
INST OF MULTIPURPOSE UTILIZATION OF MINERAL RESOURCES CHINESE ACAD OF GEOLOGICAL SCI +1
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Problems solved by technology

Combined beneficiation has a relatively mature beneficiation process, which may select a variety of concentrates, and the beneficiation effect is better; but the whole process has many process steps, the operation is cumbersome, and the addition of flotation reagents leads to wastewater discharge. In order to simplify the beneficiation process As well as reducing the discharge of polluting wastewater, adopting an efficient single physical beneficiation process is the goal of the future beneficiation process
[0005] Due to the large difference in physical properties between chromite and gangue minerals such as serpentine and talc, experiments have shown that when conventional grinding equipment is used to grind until the chromite monomer is dissociated, it is easy to cause over-grinding of gangue minerals, thereby forming A large amount of slime interferes with the separation effect of magnetic separation and shaking table, resulting in low chromite content in the final ore

Method used

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  • A beneficiation process for producing chemical-grade chromite concentrate

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Experimental program
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Effect test

Embodiment 1

[0027] The ore sample is a certain chromite ore in Xinjiang, the raw ore Cr 2 O 3 The content is 32.55%, SiO 2 The content is 12.63%. The study of technological mineralogy shows that the chromium minerals in the ore are mainly chromite, and a small amount of chromium-rich spinel: the gangue minerals are mainly talc, and the second is serpentine and carbonate minerals. For the ore, use such as figure 1 The process flow shown is selected, and the specific process parameters are as follows:

[0028] a. After rough grinding the raw ore with a rod mill, the mineral size in the slurry is -0.074mm, and the mass fraction is 65%;

[0029] b. The magnetic separation intensity when the strong magnetic tail is thrown is 1.1T, the stroke is 23mm, and the stroke frequency is 300 times / min;

[0030] c. After the coarse concentrate obtained after strong magnetic tailing is finely ground by the Isa mill, the mineral size in the slurry is -0.045mm, and the mass fraction is 85%, of which the mineral c...

Embodiment 2

[0035] The ore sample is a certain chromite ore in Tibet, the raw ore Cr 2 O 3 The content is 30.12%, SiO 2 The content is 13.88%. The study of technological mineralogy shows that the chromium minerals in the ore are mainly aluminum chromite, with a small amount of chromium-rich spinel; the gangue minerals are mainly serpentine, followed by forsterite and carbonate minerals. For the ore, use such as figure 1 The process flow shown is selected, and the specific process parameters are as follows:

[0036] a. After rough grinding the ore with a rod mill, the mineral size in the slurry is -0.074mm, and the mass fraction is 60%;

[0037] b. The magnetic separation intensity when the strong magnetic tail is thrown is 1.4T, the stroke is 26mm, and the stroke frequency is 300 times / min;

[0038] c. After the coarse concentrate obtained after strong magnetic tailing is finely ground by the Isa mill, the mineral size in the slurry is -0.045mm, and the mass fraction is 87%. The mineral content...

Embodiment 3

[0043] The ore sample is a certain chromite ore in Tibet, the raw ore Cr 2 O 3 The content is 43.60%, SiO 2 The content is 9.20%. The study of technological mineralogy shows that the chromium minerals in the ore are mainly aluminum chromite, followed by chromite and a small amount of chromium-rich spinel; the gangue minerals are mainly forsterite and secondly serpentine , A small amount of chlorite and quartz. For the ore, use such as figure 1 The process flow shown is selected, and the specific process parameters are as follows:

[0044] a. After rough grinding the ore with a rod mill, the mineral size in the slurry is -0.074mm, and the mass fraction is 58%;

[0045] b. The magnetic separation intensity when the strong magnetic tail is thrown is 1.2T, the stroke is 18mm, and the stroke frequency is 240 times / min;

[0046] c. After the coarse concentrate obtained after strong magnetic tailing is finely ground by the Isa mill, the mineral size in the slurry is -0.045mm, and the mass...

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Abstract

The invention discloses a mineral processing process capable of producing high-end chemical-stage chromite concentrates. The process uses a method of combining the magnetic reconnection process with the stage-grinding and stage-concentration to achieve sorting of the high-grade chromite, and the process comprises following steps that a, raw ore is subject to rough grinding through a rod mill, andstrong magnetic tailings discharging is carried out; b, the mass concentration of strong magnet rough concentrate ore pulp is concentrated to 50% to 60%; c, the concentrated ore pulp is subject to fine milling through an ISA mill, and two-time strong magnetic selection is carried out; d, high magnetic concentrates and middlings are subject to repeated grading through a yunnan tin table concentrator, and a final product is obtained. The high-quality chromite concentrates with the Cr2O3 content larger than or equal to 60% and the impurity SiO2 content smaller than or equal to 1.5% and capable ofmeeting the high-end chemical industrial chromium compound producing needs are obtained, the chromite recycling rate is ensured, the process flow is simple, the production cost is low, a chemical flotation agent does not need to be added, the pollution to the environment is small, the higher economic benefits and social benefits are achieved, and the process is worth of applying and popularizing.

Description

Technical field [0001] The invention belongs to the field of beneficiation technology, and specifically relates to a beneficiation process for producing chemical grade chromite concentrates, and is particularly suitable for Cr in chromite ore 2 O 3 Beneficiation and recovery of high-grade chromite ore with content ≥30%. Background technique [0002] Chromium is an important metal in modern industry, and its uses are extremely wide, mainly used in metallurgy, refractory materials and chemical industries. In the metallurgical industry, chromite is mainly used to produce ferrochrome and metallic chromium; in refractory materials, chromite is used to make chrome bricks, chrome-magnesium bricks and other special refractory materials; in the chemical industry, chromite is mainly used To produce sodium dichromate, and then prepare other chromium compounds. [0003] At present, the current chromium ore beneficiation process at home and abroad mainly adopts single gravity separation, singl...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B03B7/00B03B9/00
CPCB03B7/00B03B9/00
Inventor 邓伟拉巴江村王昌良廖祥文陈炳炎吴启坤格平格达达瓦
Owner INST OF MULTIPURPOSE UTILIZATION OF MINERAL RESOURCES CHINESE ACAD OF GEOLOGICAL SCI
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