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Mineral processing process for oolitic hematite

A technology of oolitic hematite and technology, which is applied in the direction of magnetic separation, solid separation, chemical instruments and methods, etc., can solve the problems that waste water cannot be recycled, low waste water recycling rate, long sorting process, etc., and achieve magnetization The effect is good, the cost of grinding and separation is reduced, and the recovery rate is ensured

Active Publication Date: 2016-06-22
河北省地质实验测试中心
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The fineness of the grinding process results in high grinding costs, and the long separation process results in high cost of mineral processing
The reverse flotation operation needs to add flotation reagents, the waste water generated cannot be recycled, and the waste water recycling rate is low

Method used

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  • Mineral processing process for oolitic hematite

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] Example 1, such as figure 1 As shown, this embodiment includes the following steps: (1) crush the raw ore in a crusher to a particle size below 5mm, and roast the crushed ore in a gas-fired rotary kiln for 1 hour at a roasting temperature of 500°C. (2) Grind the roasted ore until the particle size is less than 0.074mm and the content accounts for 34%, and then use a wet magnetic separator for weak magnetic separation to magnetically separate the iron coarse concentrate 1 and tailings 1. Further preferably, the weak magnetic separation field strength of the wet magnetic separator is 120kA / m. (3) The iron coarse concentrate 1 that is magnetically separated enters the vibrating screen for screening and sorting. Entering the first magnetic separation column selection, the washing water speed of the magnetic separation column is 80ml / s. (4) The iron coarse concentrate 2 and tailings 2 are selected by the magnetic separation column; the iron coarse concentrate 2 selected by...

Embodiment 2

[0012] Example 2, such as figure 1 As shown, this embodiment includes the following steps: (1) crush the raw ore in a crusher to a particle size below 5mm, and roast the crushed ore in a gas-fired rotary kiln for at least 1 hour at a roasting temperature of 530°C. (2) Grind the roasted ore until the particle size is less than 0.074mm and the content accounts for 34%, and then use a wet magnetic separator for weak magnetic separation to magnetically separate the iron coarse concentrate 1 and tailings 1. Further preferably, the weak magnetic separation field strength of the wet magnetic separator is 120kA / m. (3) The iron coarse concentrate 1 that is magnetically separated enters the vibrating screen for screening and sorting. Entering the first magnetic separation column selection, the washing water speed of the magnetic separation column is 80ml / s. (4) Iron coarse concentrate 2 and tailings 2 are selected by the magnetic separation column; the coarse concentrate 2 selected by...

Embodiment 3

[0013] Example 3, such as figure 1 As shown, this embodiment includes the following steps: (1) crush the raw ore in a crusher to a particle size below 5mm, and roast the crushed ore in a gas-fired rotary kiln for at least 1 hour at a roasting temperature of 550°C. (2) Grind the roasted ore until the particle size is less than 0.074mm and the content accounts for 34%, and then use a wet magnetic separator for weak magnetic separation to magnetically separate the iron coarse concentrate 1 and tailings 1. The weak magnetic separation field strength of the wet magnetic separator is 120kA / m. (3) The coarse iron ore concentrate 1 that is magnetically separated enters the vibrating screen for screening. The column is selected carefully, and the washing water speed of the magnetic column is 80ml / s. (4) The iron coarse concentrate 2 and tailings 2 are selected by the magnetic separation column; the iron coarse concentrate 2 selected by the magnetic separation column is ground to a pa...

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Abstract

The invention discloses a mineral processing process for oolitic hematite. The mineral processing process comprises the following steps: crushing raw ores into ores with a grain size smaller than 5mm in a crusher, and then, roasting the ores for at least one hour in a fuel gas rotary kiln with a temperature being 500-550 DEG C; grinding the ores until the content of the ores with the grain size smaller than 0.074mm is 34%, and carrying out low intensity magnetic separation on the ores by use of a wet magnetic separator to magnetically separate iron rough concentrate 1 and tailings 1; introducing the iron rough concentrate 1 into a vibrating sieve to sieve, wherein qualified iron concentrate 1 is over the vibrating sieve, and magnetic separation column concentration is firstly carried out under the vibrating sieve; concentrating iron rough concentrate 2 and tailings 2; grinding the iron rough concentrate 2 until the content of the iron rough concentrate 2 with grain size smaller than 0.074mm is 75%, and carrying out secondary magnetic separation column concentration to concentrate iron rough concentrate 3 and middlings 1; and carrying out tertiary magnetic separation column concentration on the iron rough concentrate 3 to concentrate the iron rough concentrate 2 and the tailings 2. The mineral processing process is simple and is low in cost, is environmentally-friendly and is high in return water utilization rate as no chemical is needed to be added.

Description

technical field [0001] The invention belongs to the technical field of beneficiation, and relates to a beneficiation process of oolitic hematite. Background technique [0002] The existing hematite beneficiation process, such as Jingtieshan iron ore, is processed by lump ore roasting magnetic separation (150-15mm particle size) and fine ore strong magnetic separation (15-0mm particle size). Lump ore roasting equipment is 100m 3 Anshan type reduction magnetization roasting shaft furnace, the roasting temperature is 650°C-700°C, the roasting process is closed-circuit magnetization roasting; the grinding process is three-stage grinding, and the grinding fineness is below 0.045mm, accounting for 93.81%; sorting The process is from rough concentrate after four magnetic separations to cationic reverse flotation, that is, the concentrate from the fourth magnetic separation is introduced into the regrind reverse flotation system. The regrinding operation consists of a ball mill an...

Claims

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Application Information

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IPC IPC(8): B03C1/30
CPCB03C1/30
Inventor 庞玉荣郭秀平李朝晖田江涛
Owner 河北省地质实验测试中心
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