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Method for extracting iron from high-phosphorus oolitic iron ore by suspension roasting and removing phosphorus by acid leaching

A suspension roasting, high-phosphorus oolitic technology, applied in chemical instruments and methods, magnetic separation, solid separation, etc., can solve the problems of expanding the magnetic difference between iron minerals and gangue, uneven product quality, and high energy consumption

Inactive Publication Date: 2021-01-15
SINOSTEEL EQUIP & ENG +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Through roasting, the weak magnetic hematite is converted into strong magnetic magnetite, which expands the magnetic difference between iron minerals and gangue, and can effectively recover fine-grained iron minerals, but this method has uneven product quality and energy consumption. advanced questions

Method used

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  • Method for extracting iron from high-phosphorus oolitic iron ore by suspension roasting and removing phosphorus by acid leaching

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0062] 1. Crushing: Prepare high-phosphorus oolitic hematite as raw material, its iron grade is 55.61%, and the mass percentage of phosphorus is 0.81%. After the raw material is crushed to -2mm, the material that is ground to -0.074mm accounts for 45% of the overall mass is used as roasting feed;

[0063] 2. Oxidation roasting: Send the roasted ore into the oxidation roaster for high-temperature oxidation roasting. Under the condition of oxidizing atmosphere, heat the material to 1030°C and roast for 60 minutes to obtain the oxidation roasting product;

[0064] 3. Magnetization roasting: The oxidized roasted product is roasted for 30 minutes in a reducing atmosphere at 530°C to obtain a magnetized roasted product, in which CO gas occupies the mixed gas (N 2 and CO) 30% of the total volume;

[0065] 4. Cooling oxidation: The magnetized roasted product is rapidly cooled to 200°C under the protection of nitrogen, and then exposed to air oxidation and cooled to below 90°C.

[00...

Embodiment 2

[0069] 1. Crushing: Prepare high-phosphorus oolitic hematite as raw material, its iron grade is 53.72%, and the mass percentage of P is 0.98%. After the raw material is crushed to -2mm, the material that is ground to -0.074mm accounts for 55% of the overall mass is used as roasting feed;

[0070] 2. Oxidation roasting: Send the roasted ore into the oxidation roaster for high-temperature oxidation roasting. Under the condition of oxidizing atmosphere, heat the material to 1040°C and roast for 70 minutes to obtain the oxidation roasting product;

[0071] 3. Magnetization roasting: The oxidized roasted product is roasted for 55 minutes in a reducing atmosphere at 530°C to obtain a magnetized roasted product, in which CO gas occupies the mixed gas (N 2 and CO) 25% of the total volume;

[0072] 4. Cooling oxidation: The magnetized roasted product is rapidly cooled to 190°C under the protection of nitrogen, and then exposed to air oxidation and cooled to below 90°C.

[0073] 5. Gr...

Embodiment 3

[0076] 1. Crushing: Prepare high-phosphorus oolitic hematite as raw material, its iron grade is 41.46%, and the mass percentage of P is 1.18%. After the raw material is crushed to -2mm, the material that is ground to -0.074mm accounts for 60% of the overall mass is used as roasting feed;

[0077] 2. Oxidation roasting: Send the roasted ore into the oxidation roaster for high-temperature oxidation roasting. Under the condition of oxidizing atmosphere, heat the material to 1050°C and roast for 70 minutes to obtain the oxidation roasting product;

[0078]3. Magnetization roasting: the oxidized roasted product is roasted in a reducing atmosphere at 520°C for 30 minutes to obtain a magnetized roasted product, in which CO gas accounts for the mixed gas (N 2 and CO) 40% of the total volume;

[0079] 4. Cooling oxidation: The magnetized roasted product is rapidly cooled to 240°C under the protection of nitrogen, and then exposed to air oxidation and cooled to below 90°C.

[0080] 5....

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Abstract

The invention provides a method for extracting iron from high-phosphorus oolitic iron ore by suspension roasting and removing phosphorus by acid leaching. The method adopts high-temperature oxidizingroasting to treat fluidized materials, a large number of cracks are generated in the particles, the oolitic structure is destroyed to a certain extent, and the porosity and specific surface area are increased, so that reduction and leaching are facilitated, and at the same time, the fluidized state achieves extremely high mass and heat transfer efficiency. Meanwhile, the reduced material is rapidly cooled, so that cracks are formed in the surfaces of mineral particles, the porosity is further improved, subsequent leaching and oxidation after cooling are facilitated, reduced artificial magnetite Fe3O4 is oxidized to generate a strongly magnetic mineral gamma Fe2O3 with low coercive force, the magnetic agglomeration phenomenon of iron minerals can be reduced, and the quality of magneticallyseparated products is improved. Experimental results show that the iron grade of iron ore concentrates prepared through the method is larger than or equal to 63.00%, the iron recovery rate is larger than or equal to 92.00%, and the P grade is smaller than or equal to 0.20%.

Description

technical field [0001] The invention belongs to the technical field of mineral processing, and in particular relates to a method for extracting iron by suspending roasting oolitic iron ore and removing phosphorus by acid leaching. Background technique [0002] Among the many refractory iron ores, high-phosphorus oolitic iron ore, especially the weakly magnetic high-phosphorus oolitic hematite is one of the most difficult iron ores. Oolitic iron ores are mostly oolitic, bean-shaped and kidney-shaped; with iron ore (or quartz, etc.) as the core, iron ore, quartz, and chlorite are wrapped layer by layer to form oolitic particles, forming colloidal chemical deposition The oolitic structure formed by the action of oolitic iron ore; due to its own characteristics, oolitic iron ore has not been able to be effectively developed and utilized. Collophanite and chlorite in high-phosphorus oolitic iron ore are the main phosphorus-containing minerals, with fine particle size embedded in...

Claims

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Application Information

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IPC IPC(8): C22B1/02C22B1/10C22B1/11B03C1/015
CPCC22B1/02C22B1/10C22B1/11B03C1/015
Inventor 黄武胜周丽楠延黎韩跃新李艳军哈贾特·侯赛因
Owner SINOSTEEL EQUIP & ENG
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