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Method adopting microwave to assist grinding separation of paigeite

A microwave-assisted, boronite technology, applied in the field of mineral processing, can solve the problems of large investment in the grinding process, low energy utilization rate, and high energy consumption

Inactive Publication Date: 2015-03-11
NORTHEASTERN UNIV LIAONING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In the traditional operation, the crushing and grinding process has a large investment and high energy consumption. In the concentrator, the investment in crushing and grinding accounts for more than 60% of the whole plant, the power consumption accounts for 50-60% of the beneficiation, and the production and operation costs also account for more than 40% of the whole plant; There are billions of tons of mineral materials that need to be crushed every year in the country, and more than 5% of the country's annual power generation is consumed in grinding, and about one million tons of steel are consumed in grinding; the energy in the grinding process is mainly dissipated in heat, Sound, friction, etc., the energy actually used for crushing to break the bond between mineral particles and generate a new surface only accounts for 1%, and the energy utilization rate is very low.

Method used

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  • Method adopting microwave to assist grinding separation of paigeite
  • Method adopting microwave to assist grinding separation of paigeite
  • Method adopting microwave to assist grinding separation of paigeite

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The composition of boronite contains B by weight percentage 2 o 3 6%, Fe 2 o 3 28%, MgO 37%, SiO 2 28%, Al 2 o 3 2%, CaO 0.7%, MnO 0.1%, the rest is impurities, iron grade TFe24%, particle size 15~25mm;

[0026] Carry out boronite microwave roasting in a microwave oven, the microwave power applied per 100g boronite is 1500W, and boronite is heated to 500°C;

[0027] Use a ball mill to grind the boronite after microwave roasting, the ball mill speed is 96±2 r / min, and the time is 5min;

[0028] The material after ball milling is sieved to get the part with a particle size of ≤75μm; it accounts for 47.08% of the total weight of all boronite;

[0029] The boronite fine powder is separated by magnetic separation, the magnetic field strength during magnetic separation is 170KA / m, the excitation current is 2A, and the obtained iron concentrate grade TFe is 45.20%;

[0030] Boronite and roasted boronite are as follows: figure 1 and 2 As shown, the microscopic mor...

Embodiment 2

[0032] The composition of boronite contains B by weight percentage 2 o 3 7%, Fe 2 o 3 29%, MgO 38%, SiO 2 29%, Al 2 o 3 3%, CaO 0.8%, MnO 0.2%, the rest is impurities, iron grade TFe25%, particle size 15~25mm.

[0033] Carry out the microwave roasting of boronite in the microwave oven, the microwave power applied by 100g boronite is 1800W, and the boronite is heated to 500°C;

[0034] Use a ball mill to grind the boronite after microwave roasting, the ball mill speed is 96±2 r / min, and the time is 6 minutes;

[0035] The material after ball milling is sieved to get the part with a particle size of ≤75μm; it accounts for 47.32% of the total weight of all boronite;

[0036] The boronite fine powder is separated by magnetic separation, the magnetic field strength during magnetic separation is 170KA / m, the excitation current is 2A, and the obtained iron concentrate grade TFe is 46.56%.

Embodiment 3

[0038] The composition of boronite contains B by weight percentage 2 o 3 6.2%, Fe 2 o 3 28.6%, MgO 37.7%, SiO 2 28.3%, Al 2 o 3 2.5%, CaO 0.7%, MnO 0.2%, the rest is impurities, iron grade TFe24.5%, particle size 15~25mm;

[0039] Carry out the microwave roasting of boronite in the microwave oven, the microwave power applied by 100g boronite is 2000W, and the boronite is heated to 500°C;

[0040] Use a ball mill to grind the boronite after microwave roasting, the ball mill speed is 96±2 r / min, and the time is 5min;

[0041] The material after ball milling is sieved to get the part with a particle size of ≤75μm; it accounts for 51.02% of the total weight of all boronite;

[0042] The boronite fine powder is separated by magnetic separation, the magnetic field strength during magnetic separation is 170KA / m, the excitation current is 2A, and the obtained iron concentrate grade TFe is 52.67%.

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Abstract

The invention relates to a method adopting microwave to assist grinding separation of paigeite, and belongs to the technical field of mineral processing. The method comprises the following steps: 1, carrying out microwave roasting on paigeite in a microwave oven under a microwave power of 1500-2500W per 100g of paigeite, and heating paigeite to 450-650DEG C; 2, milling the microwave roasted paigeite by adopting a ball mill under a rotating speed of 94-98r / min for 5-6min; 3, screening out obtained particles with the granularity of 75[mu]m or less; and 4, carrying out magnetic separation to obtain iron concentrate. The method starts from grinding, researches the change of the mechanical performances of ore in advance through a certain means, creates favorable conditions for subsequent grinding work, and realizes the increase of the grinding and magnetic separation efficiency.

Description

technical field [0001] The invention belongs to the technical field of mineral processing, and in particular relates to a method for grinding boronite with microwave assistance. Background technique [0002] my country is a country rich in boron ore resources in the world. Among them, the boron-iron ore reserves in Liaodong area reach 280 million tons, accounting for 57.88% of my country's boron ore resources. The structure is complex and diverse, and there are many multi-element symbiotic minerals. There are more than 30 types of minerals that have been identified, which are typical low-grade refractory composite ores. This makes boronite valuable minerals and It is difficult to fully and effectively dissociate gangue minerals, and it is difficult to separate them by simple mechanical grinding methods. It is necessary to improve the existing grinding technology and improve the resource utilization rate of boronite, which can not only meet the needs of chemical industry and me...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B02C19/18C22B1/02
CPCB02C19/186B02C17/00B02C23/00C22B1/02
Inventor 薛向欣姜涛刘亚静段培宁
Owner NORTHEASTERN UNIV LIAONING
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