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Beneficiation process for reducing roasting, iron increase and impurity reduction of amphibole type oxidized ore

An amphibole-type oxidized ore and roasting technology, which is applied in chemical instruments and methods, magnetic separation, solid separation, etc., can solve the problem of affecting the iron grade and recovery rate of the concentrate, poor gangue selectivity, and increasing the difficulty of grinding, etc. problems, to achieve high recovery rate, significant economic benefits, and improve the effect of concentrate grade

Active Publication Date: 2015-12-23
MCC NORTH (DALIAN) ENG TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Followed by quartz and calcite, the ore is a refractory iron ore, there are three reasons: (1) the current reverse flotation process is for the gangue is quartz, the selectivity of the gangue containing amphibole minerals is not Good; (2) Both the metal and the gangue mineral crystal grain size are extremely fine, which increases the difficulty of grinding; (3) The molecular formula of the gangue mafbolite in the amphibole type ore (Mg, Fe) 7 (Si 4 o 11 ) 2 (OH) 2 And iron amphibole molecular formula Fe 7 (Si 4 o 11 ) 2 (OH) 2 All contain a certain amount of iron, which is finely crystallized with metal minerals and difficult to separate, which affects the grade and recovery rate of concentrate iron; the ore mined has proven reserves of about 60 million tons and has not been developed and utilized; The scientific research project of the laboratory mineral processing test research, the focus is to use the existing mineral processing technology, equipment and flotation reagents to do in-depth and detailed mineral processing process test research, in order to obtain breakthrough mineral processing indicators and provide technical basis for the development of this iron ore resource.

Method used

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  • Beneficiation process for reducing roasting, iron increase and impurity reduction of amphibole type oxidized ore
  • Beneficiation process for reducing roasting, iron increase and impurity reduction of amphibole type oxidized ore

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Mix the amphibole-type oxidized ore crushed to -2mm with coal powder to obtain a mixture, in which the coal powder accounts for 10% of the total weight of the mixture; the iron grade TFe of the amphibole-type oxidized ore is 31%, and the particle size of the coal powder is -2mm;

[0026] The mixture is subjected to reduction roasting treatment, the reduction roasting temperature is 600°C, the reduction roasting time is 90 minutes, and the water is quenched to room temperature after the roasting is completed;

[0027] The material after water quenching is subjected to one-stage grinding, and the part with a particle size of -0.076mm accounts for 52% of the total weight, and one-stage ore powder is obtained;

[0028] The first-stage mineral powder is subjected to the first-stage magnetic separation, and the obtained first-stage magnetic separation concentrate is subjected to the second-stage grinding, and the part with a particle size of -0.026mm accounts for 93% of the t...

Embodiment 2

[0034] Mix the amphibole-type oxidized ore crushed to -2mm with coal powder to obtain a mixture, in which the coal powder accounts for 15% of the total weight of the mixture; the iron grade TFe of the amphibole-type oxidized ore is 30%, and the particle size of the coal powder is -2mm;

[0035] The mixture is subjected to reduction roasting treatment, the reduction roasting temperature is 750 ° C, the reduction roasting time is 30 minutes, and the water is quenched to room temperature after the roasting is completed;

[0036] The material after water quenching is subjected to one-stage grinding, and the part with a particle size of -0.076mm accounts for 55% of the total weight, and one-stage ore powder is obtained;

[0037] The first-stage mineral powder is subjected to the first-stage magnetic separation, and the obtained first-stage magnetic separation concentrate is subjected to the second-stage grinding, and the part with a particle size of -0.026mm accounts for 95% of the...

Embodiment 3

[0043] Mix the amphibole-type oxidized ore crushed to -2mm with coal powder to obtain a mixture, in which the coal powder accounts for 20% of the total weight of the mixture; the iron grade TFe of the amphibole-type oxidized ore is 32%, and the particle size of the coal powder is -2mm;

[0044]The mixture is subjected to reduction roasting treatment, the reduction roasting temperature is 750°C, the reduction roasting time is 10 minutes, and the water is quenched to room temperature after the roasting is completed;

[0045] The material after water quenching is subjected to one-stage grinding, and the part with a particle size of -0.076mm accounts for 60% of the total weight, and one-stage ore powder is obtained;

[0046] The first-stage mineral powder is subjected to the first-stage magnetic separation, and the obtained first-stage magnetic separation concentrate is subjected to the second-stage grinding, and the part with a particle size of -0.026mm accounts for 92% of the to...

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Abstract

The invention belongs to the technical field of beneficiation, and relates to a beneficiation process for reducing roasting, iron increase and impurity reduction of amphibole type oxidized ore. The beneficiation process comprises the following steps that 1, broken amphibole type oxidized ore and pulverized coal are mixed; 2, water quenching is carried out after reducing roasting; 3, primary grinding is carried out; 4, primary magnetic separation is carried out, and secondary grinding is carried out on obtained concentrates; 5, secondary magnetic separation is carried out, and third-stage grinding is carried out on obtained concentrates; and 6, third-stage magnetic separation is carried out, fourth-stage magnetic separation is carried out on obtained concentrates, fifth-stage elutriation magnetic separation is carried out on concentrates obtained again through an elutriation magnetic separator, and the iron grade of obtained final iron ore concentrates ranges from 63% to 64%. The final iron ore concentrates produced through the method are high in grade and recycling rate, the grade and the recycling rate of the final iron ore concentrates are greatly increased, economic benefits are remarkable, and the flowage structure is simple and feasible.

Description

technical field [0001] The invention belongs to the technical field of mineral processing, and in particular relates to a process for reducing and roasting amphibole-type oxidized ore to extract iron and reduce impurities. Background technique [0002] The main metal minerals of amphibole-type oxidized ore are false hematite, semi-false hematite, hematite, and a small amount of magnetite, limonite, siderite, pyrite, etc. The gangue minerals are more amphibole-type silicate minerals (tremolite, mafofibole, iron amphibole, etc.). Followed by quartz and calcite, the ore is a refractory iron ore, there are three reasons: (1) the current reverse flotation process is for the gangue is quartz, the selectivity of the gangue containing amphibole minerals is not Good; (2) Both the metal and the gangue minerals are extremely fine in crystal size, which increases the difficulty of grinding; (3) The molecular formula of the gangue mafbolite in the amphibole type ore (Mg, Fe) 7 (Si 4 o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B02C21/00B02C23/14B03C1/00C22B1/02
Inventor 孟光栋闫文光陈江华汪明月韩卫涛宋峰
Owner MCC NORTH (DALIAN) ENG TECH CO LTD
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