A method for producing iron concentrate by stage roasting, grinding and magnetic separation of refractory limonite

A technology for grinding, magnetic separation, and limonite, which is applied in chemical instruments and methods, magnetic separation, solid separation, etc., can solve problems such as difficulty in effectively processing limonite resources, and achieve huge economic and social benefits. Simple process and low cost effect

Active Publication Date: 2021-05-18
NORTHEASTERN UNIV LIAONING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the traditional beneficiation methods include gravity separation, magnetic separation and flotation, and it is difficult to effectively process limonite resources.

Method used

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  • A method for producing iron concentrate by stage roasting, grinding and magnetic separation of refractory limonite
  • A method for producing iron concentrate by stage roasting, grinding and magnetic separation of refractory limonite

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Process such as figure 1 shown;

[0043] The refractory limonite (refractory limonite) is ground to a particle size of -0.074mm, accounting for 68.75% of the total mass, and made into iron ore powder; the iron grade of the refractory limonite is 55.88%, and it contains Al 2 o 3 7.28%, SiO 2 3.01%, P0.088%, S 0.028%, crystal water 8.50%;

[0044] The stage roasting device is used to transport the iron ore powder to the first-stage cyclone separator through the screw feeder, and the material after the primary cyclone separation enters the lower part of the heating furnace from the discharge port; Air and gas are fed into the device. After the gas is burned, high-temperature gas is formed and enters the heating furnace. The material entering the heating furnace is heated to 850 ° C. Under negative pressure, it enters the secondary cyclone separator for secondary cyclone separation under the action of air flow; enters the heating furnace The residence time of the fur...

Embodiment 2

[0051] Method is with embodiment 1, and difference is:

[0052] (1) Grinding the refractory limonite to a particle size of -0.074mm accounts for 95.44% of the total mass to make iron ore powder; the iron grade of the refractory limonite is 56.58%, and contains Al by mass percentage 2 o 3 7.81%, SiO 2 3.02%, P 0.082%, S 0.038%, crystal water 6.88%;

[0053] (2) The material entering the heating furnace is heated to 750°C, and the residence time of the material entering the heating furnace in the heating furnace is 10s;

[0054] (3) Dehydration at 550°C, the residence time of solid material in the dehydration reactor is 10min;

[0055] (4) Reduction reaction at 460°C; residence time in reduction roasting furnace is 40min;

[0056] (5) The temperature drops to 200°C and is discharged from the cooler; the residence time of the reduced material in the cooler is 40s;

[0057] (6) Grinding the roasted material until the particle size is -0.074mm accounts for 93% of the total m...

Embodiment 3

[0060] Method is with embodiment 1, and difference is:

[0061] (1) Grinding the refractory limonite to a particle size of -0.074mm accounts for 76.8% of the total mass to make iron ore powder; the iron grade of the refractory limonite is 53.7%, containing Al by mass percentage 2 o 3 7.5%, SiO 2 3.7%, P 0.085%, S 0.036%, crystal water 4.52%;

[0062] (2) The material entering the heating furnace is heated to 800°C, and the residence time of the material entering the heating furnace in the heating furnace is 8s;

[0063] (3) Dehydration at 600°C, the residence time of solid materials in the dehydration reactor is 7min;

[0064] (4) Reduction reaction at 490°C; residence time in reduction roasting furnace is 20min;

[0065] (5) The temperature drops to 250°C and is discharged from the cooler; the residence time of the reduced material in the cooler is 30s;

[0066] (6) Grinding the roasted material until the particle size is -0.074mm accounts for 95% of the total mass, an...

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Abstract

A method for producing iron ore concentrate by stage roasting, grinding, and magnetic separation of refractory limonite, which is carried out in the following steps: (1) grinding the refractory limonite; The furnace is heated to 750-850°C, and the airflow enters the secondary cyclone separator for secondary cyclone separation; (3) discharges into the dehydration reactor, and cools down to 550-650°C in negative suspension state for dehydration; (4) After three The first-stage cyclone separator enters the reduction reactor; in the suspension state, the temperature continues to drop to 460-520°C for reduction reaction, and then enters the cooler; (5) in the suspension state, it reacts with air oxidation, and the temperature drops to 200-300°C to discharge air cooling; ( 6) After the roasted material is ground, it is subjected to one-stage magnetic separation, two-stage magnetic separation and three-stage magnetic separation. The method of the invention has the technical characteristics of simple production process, low cost, little pollution, etc.; it can effectively process limonite resources and produce qualified iron ore concentrate products.

Description

technical field [0001] The invention belongs to the technical field of mineral processing, and in particular relates to a method for producing iron concentrate by roasting, grinding, and magnetically separating refractory limonite. Background technique [0002] Iron ore resources are important raw materials for the iron and steel industry, but complex and refractory iron ores require beneficiation treatment, the average iron grade is only about 30%, and it also has the characteristics of complex mineral composition and fine particle size; the development and utilization of refractory iron ore It is of great practical and strategic significance to improve iron ore resources, increase the reserves of available iron ore resources, and alleviate the contradiction between supply and demand of iron ore resources. [0003] Limonite ore is a typical refractory iron ore resource. However, limonite ore has not been effectively developed and utilized due to its characteristics of high ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B1/02B04C9/00B03C1/30
CPCB03C1/30B04C9/00C22B1/02
Inventor 孙永升韩跃新祝昕冉李艳军高鹏
Owner NORTHEASTERN UNIV LIAONING
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