Dephosphorization method for oolitic high phosphorus iron ore

A high-phosphorus iron ore and oolitic technology is applied in the field of dephosphorization of high-phosphorus iron ore, which can solve the problems of high cost and poor dephosphorization effect, and achieve the effects of low production cost, convenient operation and excellent dephosphorization effect.

Inactive Publication Date: 2009-07-22
解能 +1
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to provide a simple process, convenient operation, low energy consumption, low production cost, dephosphorization and dephosphorization in order to overcome the defects of high

Method used

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  • Dephosphorization method for oolitic high phosphorus iron ore

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Effect test

Embodiment 1

[0013] The product of this experiment is an industrial experiment product. Test site: Huaguoqing High Phosphorus Iron Ore Matching Plant, Wuding, Yunnan, main parameters: use a crusher to crush the raw ore to below 30mm; use a 15m 3 Shaft furnace, roasting temperature 700°C, coal mine ratio 1:25, roasting time 20 minutes. Grinding time is 5 minutes, the fineness of ore powder is 0.045mm to reach 75%, strong magnetic separation adopts 4000 gauss; acid leaching: use 8% dilute nitric acid solution, acid leaching time: 3 hours, ultrasonic cleaning: 20,000 Hz frequency, cleaning Time: 15 minutes. After weak magnetic separation, a good phosphorus removal effect is achieved, and the iron grade reaches above 58%.

Embodiment 2

[0015] Oolitic high-phosphorus iron ore in Wuding, Yunnan, containing 38% iron and 0.8% phosphorus, the raw ore is crushed with a crusher to less than 30mm, roasted at 400°C for 10 minutes, and then ground with a ball mill to make 80% of the 100-mesh material Slurry is subjected to strong magnetic roughing under a strong magnetic field of about 4000 Gauss, and the roughed gangue slurry is sent to a sedimentation tank for settlement. Roughly selected qualified iron ore, add 4% sulfuric acid solution, soak for 1.5 hours in an acidic environment, and then send it to the ultrasonic chemical dephosphorization plate tank after stirring. Under the action of 4 kHz ultrasonic waves, the iron ore particles are continuously strengthened and decomposed In 25 to 30 minutes, 80%-85% of the phosphorus in the iron ore is decomposed and removed by acid, and then about 2000 Gauss weak magnetic separation can be carried out to obtain an iron concentrate with a phosphorus content of less than 0.25...

Embodiment 3

[0017] Oolitic high-phosphorus iron ore in Lufeng, Yunnan, containing 48% iron and 0.8% phosphorus, was crushed with a crusher to less than 30mm, roasted at 800°C for 15 minutes, and then ground with a ball mill to make 80% slurry over 150 mesh. Strong magnetic roughing is carried out under a magnetic field of about 4000 Gauss, and the roughed gangue slurry is sent to the sedimentation tank for settlement. Roughly selected qualified iron ore, add 10% hydrochloric acid solution, soak for 5 hours in an acidic environment, and then send it to the ultrasonic chemical dephosphorization tank after stirring. In ~25 minutes, 80% - 85% of the phosphorus in the iron ore is decomposed and removed by acid, and then about 2000 Gauss weak magnetic separation can be performed to obtain an iron concentrate with a phosphorus content of less than 0.25% and an iron grade of more than 60%, which fully meets the requirements Metallurgical material requirements. The tailings slurry produced by mag...

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Abstract

The invention relates to a high-phosphate oolitic iron ore dephosphorization method. The raw ore is roasted at the temperature of between 400 DEG C and 800 DEG C after crushing, high intensity magnetic separation is carried out after ore grinding, and acid leaching is carried out to ore powder by using industrial sulfuric acid or industrial nitric acid or industrial hydrochloric acid with the proportion being: 4 percent to 10 percent of acid:90 percent to 96 percent of water; the soaking time is 1.5 to 5 hours; phosphorus is obtained by vibration cleaning ore powder by using ultrasonic waves with the frequency being 4000 hertz to 20 000 hertz and vibration time is 15 to 20 minutes, and then concentrates and middlings are picked out by using low intensity magnetic separation. The dephosphorization method has the advantages of low dephosphorization cost, simple dephosphorization technology and equipment and good dephosphorization effects.

Description

Technical field: [0001] The invention belongs to the dephosphorization of high-phosphorus iron ore, in particular to the technical field of dephosphorization of oolitic high-phosphorus iron ore. Background technique: [0002] The existing dephosphorization technology of high-phosphorus iron ore, especially the dephosphorization technology of oolitic high-phosphorus iron ore, mainly adopts chemical flotation and dephosphorization technology of grease ore for dephosphorization. The dephosphorization cost is too high, and the dephosphorization process and equipment It is also complicated; the energy consumption is particularly high, and the dephosphorization effect is not ideal. Often due to the complexity of the ore body, the dephosphorization cannot meet the quality requirements stipulated by the state for smelters, resulting in repeated dephosphorization, which makes the production cost very high. [0003] Oolitic high-phosphorus iron ore is an iron ore with abundant reserve...

Claims

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Application Information

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IPC IPC(8): C22B1/214C22B3/06
CPCY02P10/20
Inventor 解能陈爱中谭正才
Owner 解能
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