CN103977886B - The coal separation intensifying method of magnetite powder magnetic - Google Patents
The coal separation intensifying method of magnetite powder magnetic Download PDFInfo
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- CN103977886B CN103977886B CN201410146123.6A CN201410146123A CN103977886B CN 103977886 B CN103977886 B CN 103977886B CN 201410146123 A CN201410146123 A CN 201410146123A CN 103977886 B CN103977886 B CN 103977886B
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- magnetite powder
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- coal separation
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Abstract
The present invention is specially the intensifying method of a kind of coal separation magnetite powder magnetic, solves that existing fine-grained magnetite powder magnetic is more weak to be existed technological attrition and cause the problem economically wasted.The coal separation intensifying method of magnetite powder magnetic, use following steps: a, magnetite powder is placed on corundum crucible after put in heating furnace, being decompressed to air pressure in heating furnace is 0.01 0.1Mpa；After b, heating furnace are heated to 300 700 DEG C of insulation 30 60min, stop heating；C, heating furnace natural cooling in atmosphere, the pulsed magnetic field that meanwhile, frequency of constructing in heating furnace side is 30 500Hz, magnetic field intensity is 5000 15000oe, being cooled to room temperature to heating furnace body；D, taking-up magnetite powder carry out packing and storing.The present invention uses the synergism of heating and pulsed magnetic field, coal separation Armco magnetic iron breeze is processed, thus reach to increase the purpose that this material is increased magnetic, and then reduce Jie's consumption during coal separation, have that technique is simple, strength is relatively low and the advantage of low cost.
Description
Technical field
The present invention relates to the intensifying method of magnetic dense media powder magnetic, the intensifying method of a kind of coal separation magnetite powder magnetic.
Background technology
At present, coal washing is paid much attention to by most countries, especially developed country.This life circle, the average preparation proportion of raw coal was about 50%, some countries even more than 80%.Although some countries of Europe almost close all of colliery, but still have coal preparation plant for processing import coal.
Presently the most conventional coal preparation method is dense-medium separation.Dense-medium separation medium powder is used to increase the material of fluid density, and it can be repeated continuously recovery by magnetic separator and utilize magnetic medium powder during coal separation.
But magnetic medium powder Jie's consumption problem occurs in coal separation process, the consumption that is situated between refers to the phenomenon that medium powder runs off during coal separation along with product and black water.
The most conventional magnetic dense media powder is magnetite powder, magnetite powder i.e. ferroso-ferric oxide powder, and magnetic material content is more than 90%, and granularity is 1-50um.The loss of magnetite powder includes management loss and technological attrition, and technological attrition includes that the entrained loss of de-mediated oversize and magnetic tailing carry dielectric loss.All using sculping screen high pressure water washing due to most of coal preparation plants at present, sculping screen product dielectric loss is less, and the dielectric loss of 80% is owing to magnetic tailing carries loss.The magnetic of coal separation medium with its in mine tailing to carry loss amount directly related, the dielectric loss amount that dielectric loss rate that magnetic is little is big compared with magnetic is big；Particle diameter less coal separation medium loss relatively particle diameter in magnetic tailing becomes apparent from greatly, and this is big due to its fine size, specific surface mainly due to particulate weak magnetism mineral, thus magnetic is more weak.
Summary of the invention
The present invention is to solve that existing fine-grained magnetite powder magnetic is more weak to there is technological attrition and cause the problem economically wasted, it is provided that the intensifying method of a kind of coal separation magnetite powder magnetic.
The present invention adopts the following technical scheme that realization: the intensifying method of coal separation magnetite powder magnetic, use following steps: a, magnetite powder is placed on corundum crucible after put in heating furnace, being decompressed to air pressure in heating furnace is 0.01-0.1Mpa；After b, heating furnace are heated to 300-700 DEG C of insulation 30-60min, stop heating；C, heating furnace natural cooling in atmosphere, meanwhile, frequency of constructing in heating furnace side is 30-500Hz, magnetic field intensity is the pulsed magnetic field of 5000-15000oe, being cooled to room temperature to heating furnace body；D, taking-up magnetite powder carry out packing and storing.
Pressure, heating-up temperature and temperature retention time and pulsed magnetic field frequency and choosing of intensity draw through substantial amounts of repetition test, overcome that existing fine-grained magnetite powder magnetic is more weak to be existed technological attrition and cause the problem economically wasted.
The present invention uses heating and the synergism of pulsed magnetic field, processes coal separation Armco magnetic iron breeze, thus reaches to increase the purpose of this magnetism of material, and then reduces Jie's consumption during coal separation, has that technique is simple, intensity is relatively low and the advantage of low cost.
Contrasted by the hysteresis curve of magnetite powder before and after strengthening, before strengthening, the hysteresis curve of magnetite powder is bending, saturation magnetic field intensity is 58emu/g, and the hysteresis curve shape of the magnetite powder after strengthening presents similar rectangular shape, saturation magnetic field intensity has reached 82 emu/g, and the magnetic property of magnetite powder is significantly improved.
Magnetite powder after strengthening is carried out magnetic material content and magnetism testing, and the conclusion drawn is that magnetic material content adds 2.11-4.11%, and remnant field intensity adds 68-118%, and saturation magnetic field intensity adds 43-90%.
Detailed description of the invention
Embodiment
1
The coal separation intensifying method of magnetite powder magnetic, use following steps: a, magnetite powder is placed on corundum crucible after put in heating furnace, being decompressed to air pressure in heating furnace is 0.09Mpa；After b, heating furnace are heated to 300 DEG C of insulation 40min, stop heating；C, heating furnace natural cooling in atmosphere, meanwhile, frequency of constructing in heating furnace side is 30Hz, magnetic field intensity is the pulsed magnetic field of 5000oe, being cooled to room temperature to heating furnace body；D, taking-up magnetite powder carry out packing and storing.
Testing its magnetic material content and increase by 2.11%, remnant field intensity increases by 68%, and saturation magnetic field intensity increases by 43%.
Embodiment
2
The coal separation intensifying method of magnetite powder magnetic, use following steps: a, magnetite powder is placed on corundum crucible after put in heating furnace, being decompressed to air pressure in heating furnace is 0.06Mpa；After b, heating furnace are heated to 400 DEG C of insulation 30min, stop heating；C, heating furnace natural cooling in atmosphere, meanwhile, frequency of constructing in heating furnace side is 100Hz, magnetic field intensity is the pulsed magnetic field of 8000oe, being cooled to room temperature to heating furnace body；D, taking-up magnetite powder carry out packing and storing.
Testing its magnetic material content and increase by 2.63%, remnant field intensity increases by 77%, and saturation magnetic field intensity increases by 50%.
Embodiment
3
The coal separation intensifying method of magnetite powder magnetic, use following steps: a, magnetite powder is placed on corundum crucible after put in heating furnace, being decompressed to air pressure in heating furnace is 0.03Mpa；After b, heating furnace are heated to 500 DEG C of insulation 45min, stop heating；C, heating furnace natural cooling in atmosphere, meanwhile, frequency of constructing in heating furnace side is 200Hz, magnetic field intensity is the pulsed magnetic field of 10000oe, being cooled to room temperature to heating furnace body；D, taking-up magnetite powder carry out packing and storing.
Testing its magnetic material content and increase by 3.01%, remnant field intensity increases by 86%, and saturation magnetic field intensity increases by 52%.
Embodiment
4
The coal separation intensifying method of magnetite powder magnetic, use following steps: a, magnetite powder is placed on corundum crucible after put in heating furnace, being decompressed to air pressure in heating furnace is 0.02Mpa；After b, heating furnace are heated to 600 DEG C of insulation 50min, stop heating；C, heating furnace natural cooling in atmosphere, meanwhile, frequency of constructing in heating furnace side is 30Hz, magnetic field intensity is the pulsed magnetic field of 5000oe, being cooled to room temperature to heating furnace body；D, taking-up magnetite powder carry out packing and storing.
Testing its magnetic material content and increase by 3.17%, remnant field intensity increases by 99%, and saturation magnetic field intensity increases by 70%.
Embodiment
5
The coal separation intensifying method of magnetite powder magnetic, use following steps: a, magnetite powder is placed on corundum crucible after put in heating furnace, being decompressed to air pressure in heating furnace is 0.01Mpa；After b, heating furnace are heated to 700 DEG C of insulation 40min, stop heating；C, heating furnace natural cooling in atmosphere, meanwhile, frequency of constructing in heating furnace side is 30Hz, magnetic field intensity is the pulsed magnetic field of 5000oe, being cooled to room temperature to heating furnace body；D, taking-up magnetite powder carry out packing and storing.
Testing its magnetic material content and increase by 4.11%, remnant field intensity increases by 118%, and saturation magnetic field intensity increases by 90%.
Claims (1)
1. the coal separation intensifying method of magnetite powder magnetic, it is characterised in that: use following steps: a, magnetite powder is placed on corundum crucible after put in heating furnace, being decompressed to air pressure in heating furnace is 0.01-0.1Mpa；After b, heating furnace are heated to 300-700 DEG C of insulation 30-60min, stop heating；C, heating furnace natural cooling in atmosphere, meanwhile, frequency of constructing in heating furnace side is 30-500Hz, magnetic field intensity is the pulsed magnetic field of 5000-15000oe, being cooled to room temperature to heating furnace body；D, taking-up magnetite powder carry out packing and storing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410146123.6A CN103977886B (en) | 2014-04-14 | 2014-04-14 | The coal separation intensifying method of magnetite powder magnetic |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410146123.6A CN103977886B (en) | 2014-04-14 | 2014-04-14 | The coal separation intensifying method of magnetite powder magnetic |
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| Publication Number | Publication Date |
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| CN103977886A CN103977886A (en) | 2014-08-13 |
| CN103977886B true CN103977886B (en) | 2016-08-17 |
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| CN201410146123.6A Expired - Fee Related CN103977886B (en) | 2014-04-14 | 2014-04-14 | The coal separation intensifying method of magnetite powder magnetic |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109261342B (en) * | 2018-08-02 | 2020-08-07 | 河南省核力科技发展有限公司 | Preparation method of dense medium for coal dressing based on irradiation grafting |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2026998A (en) * | 1932-06-15 | 1936-01-07 | Program Clock Inc | Program clock |
| CN1173026A (en) * | 1996-07-17 | 1998-02-11 | 三荣化成株式会社 | Modified permanent magnet primitive powder and preparation method thereof |
| CN101172613A (en) * | 2007-10-10 | 2008-05-07 | 大连理工大学 | Method for activating ludwigite |
-
2014
- 2014-04-14 CN CN201410146123.6A patent/CN103977886B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2026998A (en) * | 1932-06-15 | 1936-01-07 | Program Clock Inc | Program clock |
| CN1173026A (en) * | 1996-07-17 | 1998-02-11 | 三荣化成株式会社 | Modified permanent magnet primitive powder and preparation method thereof |
| CN101172613A (en) * | 2007-10-10 | 2008-05-07 | 大连理工大学 | Method for activating ludwigite |
Non-Patent Citations (4)
| Title |
|---|
| 磁选尾矿中损失的磁铁矿粉性质的研究;严洁静等;《选煤技术》;20100825(第4期);10-13 * |
| 金属磁粉的制备及其表面处理;朱昊果等;《磁记录材料》;19961231(第1期);5-9 * |
| 降低重介质选煤过程中介质消耗的探讨与实践;刘俊平;《煤》;20081031;第17卷(第10期);89-91页 * |
| 降低重介质选煤过程中介质消耗的探讨与实践;杨学静;《科技传播》;20121231(第3期);120-121 * |
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