Pretreatment method of magnetite

A processing method and magnetite technology, applied in grain processing and other directions, can solve problems such as environmental pollution and complex flotation process, and achieve the effects of environmental friendliness, simple processing method and good dissociation.

Inactive Publication Date: 2012-02-08
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the addition of flotation agents will complicate the subsequent flotation process and easily cause environmental pollution

Method used

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  • Pretreatment method of magnetite
  • Pretreatment method of magnetite
  • Pretreatment method of magnetite

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Example 1: see figure 1 , Weigh 50g of magnetite, crush it, the crushing particle size is 20mm, dry the crushed magnetite at 80°C for 30h, and then use a microwave heating device with a power of 1KW and a frequency of 2350MHZ to heat the sample. Microwave irradiation, the irradiation time is 25s, put it into the water under normal temperature condition and cool for 5min immediately after irradiation. from figure 2 with image 3 The comparison found that micro-cracks appeared on the surface of the ore after microwave irradiation.

[0018] Grinding the pretreated magnetite can make the ore particle size pass through the 200-mesh sieve to reach more than 80%. The magnetite after the ore grinding treatment is subjected to magnetic separation treatment, and the magnetic separation concentrate yield of the magnetite is increased from 44% to 72% when the raw ore is not treated; The grade of mineral products has increased by 6% compared with the original ore.

Embodiment 2

[0019] Example 2: see figure 1 , Weigh 500g of magnetite, crush it, the crushed particle size is 21mm, dry the crushed magnetite at 100°C for 40h, and then use a microwave heating device with a power of 3kW and a frequency of 2450MHz to process the sample. Microwave irradiation, the irradiation time is 60s, immediately put it into the water under the condition of normal temperature to cool for 8min after irradiation.

[0020] Grinding the pretreated magnetite can make the content of the ore pass through a 200-mesh sieve reach more than 80%. The magnetite after the ore grinding treatment is subjected to magnetic separation treatment, and the magnetic separation concentrate yield of the magnetite is increased from 44% to 72% when the raw ore is not treated; The grade of mineral products has increased by 8% compared with the original ore.

Embodiment 3

[0021] Example 3: see figure 1 , Weigh 300g of magnetite, crush it, the crushed particle size is 29mm, dry the crushed magnetite at 150°C for 60h, and then use a microwave heating device with a power of 6kW and a frequency of 2550MHz to process the sample. Microwave irradiation, the irradiation time is 70s, put it into the water under normal temperature condition to cool for 10min immediately after irradiation.

[0022] Grinding the pretreated magnetite can make the content of the ore pass through a 200-mesh sieve reach more than 80%. The magnetite after the ore grinding treatment is subjected to magnetic separation treatment, and the magnetic separation concentrate yield of the magnetite is increased from 44% to 72% when the raw ore is not treated; The grade of mineral products has increased by 8% compared with the original ore.

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Abstract

The invention discloses a pretreatment method of magnetite, and belongs to the technical field of mineral processing. A sample is firstly crushed, dried, and then irradiated by microwave, and the sample is cooled by water immediately after irradiation. In the invention, with the characteristic of selective heating of microwave irradiation, thermal stress cracks are formed on boundaries of valuable minerals and gangue grains inside the ore; the fragmentation of the ore occurs firstly at these cracks; therefore, minerals can be dissociated better in subsequent ore grinding process, and thus the magnetic separation concentrate yield and concentrate grade of magnetite are increased.

Description

technical field [0001] The invention relates to a pretreatment method of magnetite, which belongs to the field of mineral processing. Background technique [0002] The fundamental purpose of ore grinding is to make the useful monomer particles and gangue particles minimize the overgrinding, improve the degree of monomer dissociation of recovered minerals, so as to meet the particle size requirements in the grinding and subsequent beneficiation process . As the rich ore available in mineral resources becomes less and less, the utilization of lean ore is inevitable. In the process, try to achieve monomer dissociation of useful minerals, thereby improving the grade of minerals. Selective grinding technology is an effective way to achieve this requirement. [0003] In order to make the ore produce selective grinding during the grinding process, some techniques and methods have been reported in the known literature. Liu Quanjun pointed out in the article Research on Selective...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B02C19/18
Inventor 彭金辉陈菓陈晋郭胜惠张利波张泽彪
Owner KUNMING UNIV OF SCI & TECH
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