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High-voltage electric pulse pretreatment-magnetizing roasting system and method for refractory iron ore

A high-voltage electric pulse and magnetization roasting technology, which is applied in the field of mineral processing, can solve the problems of large dust, over-grinding, and low degree of dissociation, and achieve the effect of strengthening the reaction rate, avoiding energy waste, and simple process flow

Active Publication Date: 2020-12-15
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In view of the technical deficiencies such as low degree of dissociation, large dust, and serious over-crushing phenomenon in the existing mechanical crushing of minerals, the present invention provides a high-voltage electric pulse pretreatment-magnetization roasting system and method for refractory iron ore

Method used

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  • High-voltage electric pulse pretreatment-magnetizing roasting system and method for refractory iron ore
  • High-voltage electric pulse pretreatment-magnetizing roasting system and method for refractory iron ore
  • High-voltage electric pulse pretreatment-magnetizing roasting system and method for refractory iron ore

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Embodiment 1

[0039] In the embodiment of the present invention, the voltage of the input power supply is 220V, and the frequency is 50Hz.

[0040] The input voltage of the single-phase voltage regulator in the embodiment of the present invention is 0-250V, and the frequency is 50Hz.

[0041] The gas switch in the embodiment of the present invention is set according to the technology recorded in "Practical Technology of High Voltage Switchgear"; each gas switch includes two trigger balls; the material of the trigger ball is copper and the diameter is 20mm.

[0042] The Marx generator in the embodiment of the present invention is set according to the scheme recorded in "Pulse Power Technology and Application".

[0043] The model of the oscilloscope in the embodiment of the present invention is VC1100AN.

[0044] The voltage divider in the embodiment of the present invention is a hollow sphere with a diameter of 15 cm, and the material is stainless steel.

[0045] The material of the insula...

Embodiment 2

[0078] The structure of the refractory iron ore high-voltage electric pulse pretreatment-magnetization roasting system is the same as in Example 1;

[0079] Method is with embodiment 1, and difference is:

[0080] (1) The pulse voltage is 120kV, the pulse frequency is 20Hz, and the residence time of the ore in the high-voltage electric pulse crushing cavity is 50min;

[0081] (2) The pretreated ore is in a suspended state under the action of airflow and heated to 550°C; the volume flow ratio of nitrogen and carbon monoxide fed into the suspension reduction roaster is 3.5; the residence time of the pretreated ore in the suspension reduction roaster The time is 25 minutes;

[0082] (3) The cooling material temperature is 65°C;

[0083] (4) Add water to the cooling material to make an ore slurry with a mass concentration of 80%, and then grind the ore through a ball mill until the particle size of the solid material ≤ 0.074mm accounts for 80% of the total mass; the ground mater...

Embodiment 3

[0088] The structure of the refractory iron ore high-voltage electric pulse pretreatment-magnetization roasting system is the same as in Example 1;

[0089] Method is with embodiment 1, and difference is:

[0090] (1) The pulse voltage is 80kV, the pulse frequency is 50Hz, and the residence time of the ore in the high-voltage electric pulse crushing chamber is 80min;

[0091] (2) The pretreated ore is in a suspended state under the action of the airflow and is heated to 500°C; the volume flow ratio of nitrogen and carbon monoxide fed into the suspension reduction roaster is 4; the residence time of the pretreated ore in the suspension reduction roaster The time is 30 minutes;

[0092] (3) The cooling material temperature is 60°C;

[0093] (4) Add water to the cooling material to make a slurry with a mass concentration of 60%, and then grind it through a ball mill until the particle size of the solid material ≤ 0.074mm accounts for 85% of the total mass; use a weak magnetic s...

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Abstract

The invention discloses a high-voltage electric pulse pretreatment-magnetizing roasting system and method for refractory iron ore. The system is composed of a high-voltage electric pulse pretreatmentpart and a magnetizing roasting part. The high-voltage electric pulse pretreatment part comprises a feeding bin, a spiral feeder, a high-voltage electric pulse crushing chamber, a pulse high-voltage electric generator, an output power supply, an insulating liquid storage pool and an oscilloscope. The magnetizing roasting part comprises a middle feeding bin, a middle spiral feeder, a suspension reduction roasting furnace, a cooler, a ball mill and a magnetic separator. The method comprises the steps of (1) conveying the ore to the high-voltage electric pulse crushing chamber through the feedingbin and the spiral feeder, and introducing insulating liquid into the high-voltage electric pulse crushing chamber; (2) carrying out high-voltage electric pulse pretreatment on the ore; (3) filteringand drying the pretreated ore; (4) conveying the ore to the suspension reduction roasting furnace for carrying out reduction reaction; (5) putting the ore into the ball mill after heat exchange; and(6) performing low-intensity magnetic separation after ore grinding. According to the high-voltage electric pulse pretreatment-magnetizing roasting system and method for the refractory iron ore provided by the invention, the method is simple in technological process, the system is stable in operation, and the product properties are easy to control.

Description

technical field [0001] The invention belongs to the technical field of mineral processing, and in particular relates to a high-voltage electric pulse pretreatment-magnetization roasting system and method for refractory iron ore. Background technique [0002] With the depletion of high-quality easy-to-select iron ore resources, it is of great economic and strategic significance to study the comprehensive utilization of complex refractory iron ore resources. Iron ore resources such as fine-grained hematite, oolitic hematite, specularite, limonite, and stockpiled iron tailings are typical complex refractory iron ore resources. Complex refractory iron ore resources have the characteristics of fine crystal grain size, complex mineral composition, many associated components, and low iron occurrence. Based on the above characteristics, it is difficult to effectively solve complex refractory iron ore resources only by traditional mineral processing methods. resource sorting problem...

Claims

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Application Information

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IPC IPC(8): C22B1/02B02C19/18B02C23/16
CPCB02C19/18B02C23/16B02C2019/183B02C2023/165C22B1/02
Inventor 韩跃新高鹏秦永红袁帅李艳军张琦张宁豫张洪浩
Owner NORTHEASTERN UNIV
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