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High-pressure roller mill magnetic separation closed-loop waste pre-throwing crushing process for magnetite

A high-pressure roller mill and high-pressure roller mill technology, applied in the direction of magnetic separation, solid separation, sieve, etc., can solve the problems of long and complicated process, reducing the amount of ore, etc.

Active Publication Date: 2021-04-30
安徽新建矿业工程技术有限责任公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] At present, there are also relevant patents on the market, for example, the publication number is CN107899738A, and the name is an application for an invention patent for an energy-saving mineral processing method for processing fine-grained magnetite. Elutriation and selection, the use of elutriation magnetic separation technology under the condition of relatively coarse grinding fineness can early harvest the magnetite that has been basically dissociated from the monomer, greatly reducing the amount of ore for subsequent fine grinding, and achieving a reduction in grinding The cost is more than 30%; but it only reduces the energy consumption of fine grinding in ore grinding, and the energy consumption of crushing and rough grinding needs to be further reduced, and the whole process flow is too long and complicated; therefore, there is an urgent need for magnetite high-pressure roller mill Machine magnetic separation closed-circuit pre-throwing waste crushing process to solve this problem

Method used

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  • High-pressure roller mill magnetic separation closed-loop waste pre-throwing crushing process for magnetite
  • High-pressure roller mill magnetic separation closed-loop waste pre-throwing crushing process for magnetite
  • High-pressure roller mill magnetic separation closed-loop waste pre-throwing crushing process for magnetite

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Embodiment 1

[0039] This embodiment adopts the magnetite high-pressure roller mill magnetic separation closed-circuit pre-throwing waste crushing process of the present invention, and the process flow is as follows figure 1As shown, the ore processed in this embodiment is a very poor magnetite in Chengde, Hebei Province. The ore has an iron grade of TFe=20.26%, a magnetic iron grade of mFe=12.18%, and a magnetic rate of 60.12%. Metal minerals are mainly magnetite, titanium magnetite, siderite, a small amount of hematite and pyrite; gangue minerals are mainly mica, garnet, hornblende, pyroxene, plagioclase, quartz, Chlorite and apatite etc. To crush the raw ore to -30mm, the steps are as follows:

[0040] a) Feed magnetite into the high-pressure roller mill, the specific pressure of the extrusion rollers between the rollers is 4.2MPa, the rolling speed is 10m / s, and the roller spacing is 55mm, and the high-pressure roller mill crushing operation is carried out to obtain the rolled product;...

Embodiment 2

[0055] This embodiment adopts the magnetite high-pressure roller mill magnetic separation closed-circuit pre-throwing waste crushing process of the present invention, and the process flow is as follows figure 2 Shown, the ore processed in this embodiment is the same as the sample of embodiment 2, and the concrete steps are as follows:

[0056] a) Feed the magnetite into a section of high-pressure roller mill, the specific pressure of the extrusion rollers between the rollers is 4.0MPa, the rolling speed is 12m / s, and the roller spacing is 50mm, and a section of high-pressure roller grinding operation is carried out to obtain a section of rolled products ;

[0057] b) Feed the first section of rolling product obtained in step a into a section of fine ore dry separation machine, the magnetic field strength of the powder ore dry separation machine is 3000 Oersted, and carry out the coarse separation operation of the powder ore dry separation machine to obtain a section of powder...

Embodiment 3

[0075] This embodiment adopts the magnetite high-pressure roller mill magnetic separation closed-circuit pre-throwing waste crushing process of the present invention, and the process flow is as follows image 3 As shown, the ore processed in this embodiment is a certain Anshan type lean magnetite, the ore iron grade TFe=26.39%, magnetic iron grade mFe=19.25%, the main iron-containing minerals are magnetite, iron silicate and Iron carbonate, pseudo-hematite, semi-pseudo-hematite, hematite and limonite are low in content, and are high-silicate iron-poor magnetite. The raw ore is crushed to -20mm, and the specific steps are as follows:

[0076] a) Feed the magnetite into a high-pressure roller mill, the specific pressure of the squeeze roller between the rollers is 3.8MPa, the rolling speed is 10m / s, and the roller spacing is 60mm, and a high-pressure roller mill operation is carried out to obtain a roller-pressed product ;

[0077] b) Feed a section of the rolled product obtain...

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Abstract

The invention discloses a high-pressure roller mill magnetic separation closed-loop waste pre-throwing crushing process for magnetite, and relates to the technical field of magnetite ore pre-separation. The process comprises the following steps: feeding the magnetite into a first-section high-pressure roller mill for first-section high-pressure roller milling operation to obtain a first-section rolled product; feeding a first-section rolled product into a fine ore dry separator, and performing roughing operation of the fine ore dry separator to obtain concentrate to be processed and tailings of the fine ore dry separator; feeding the tailings of the fine ore dry separator into a first-section magnetic pulley, and conducting first-section magnetic pulley scavenging and waste throwing operation to obtain first-section magnetic pulley concentrate and first-section magnetic pulley tailings; returning the first-section magnetic pulley concentrate to the first-section high-pressure roller mill to perform first-section circulating high-pressure roller milling operation; and feeding the to-be-processed concentrate into a wet magnetic separator, and performing wet magnetic separation waste throwing operation to obtain rough concentrate and wet magnetic separation tailings. According to the process, the grade of the ores to be ground can be improved, the granularity and quantity of the ores to be ground are reduced, the grinding process flow is greatly shortened, the production cost is reduced, and the production efficiency is improved.

Description

technical field [0001] The invention relates to the technical field of magnetite pre-selection, in particular to a closed-circuit pre-throwing and crushing process for magnetite high-pressure roller mill magnetic separation. Background technique [0002] In the past ten years, with the rapid development of China's industry, the demand for iron ore resources has been at a high level. Due to the poor endowment of iron ore resources in my country, the characteristics of "poor, fine, and miscellaneous" are more prominent, and the mineral processing industry is proposed. higher requirements. In order to meet the market's large demand for iron ore powder, the concentrator has to reduce the grade of the iron ore to be selected, and process a large amount of refractory iron ore such as boundary ore and off-surface ore to alleviate the shortage of resources. But this has greatly increased the cost of beneficiation, especially the energy consumption of crushing and grinding. [0003]...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B02C21/00B02C4/02B03C1/30B07B1/28B07B1/46
CPCB02C21/00B02C4/02B03C1/30B07B1/28B07B1/4609
Inventor 葛新建陈于海桂志海程传麟胡佛明沈远海吴国军葛琨杨书春刘翀常军胡城刘广才赵文涛刘进
Owner 安徽新建矿业工程技术有限责任公司