CN103041913B - Beneficiation method for artificial magnetite - Google Patents
Beneficiation method for artificial magnetite Download PDFInfo
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- CN103041913B CN103041913B CN201310028248.4A CN201310028248A CN103041913B CN 103041913 B CN103041913 B CN 103041913B CN 201310028248 A CN201310028248 A CN 201310028248A CN 103041913 B CN103041913 B CN 103041913B
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- artificial magnetite
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Abstract
The invention discloses a beneficiation method for an artificial magnetite. The beneficiation method comprises the following steps of: carrying out first-stage ore grinding by taking the artificial magnetite as a raw material; carrying out low intensity magnetic separation on the discharged material subjected to the first-stage ore grinding to remove tailings; sequentially carrying out strong shear stress demagnetization and second-stage ore grinding on a mineral aggregate subjected to the low intensity magnetic separation until the artificial magnetite is output as a single; carrying out low intensity fine magnetic separation on the discharged material subjected to the second-stage ore grinding to remove tailings; demagnetizing the mineral aggregate subjected to the low intensity fine magnetic separation by using a demagnetizer; and carrying out flotation separation on the demagnetized mineral aggregate to finally obtain an iron ore concentrate. The method provided by the invention has the advantages of simple step, low investment, stable recovery rate, good product quality and the like.
Description
Technical field
The invention belongs to technical field of mineral processing, particularly relate to a kind of beneficiation method of artificial magnetite.
Background technology
Along with the high speed development of steel and iron industry, China sharply increases the demand of iron ore.At present, the iron ore degree of self-sufficiency needed for China's steel and iron industry is less than 50%, and iron ore resource critical shortage, has become " bottleneck " of restriction China development of iron & steel industry.
China iron deposit stone resource is rich and not rich, reserves occupy the 4th, the world, but more than 95% is lean ore, what wherein account for gross reserves more than 25% is that the complicated difficult such as the embedding cloth of granularity is thin, gangue is mainly Iron-containing silicate bloodstone and low-grade limonite, siderite selects ferric oxide ore, adopts conventional beneficiation method to be difficult to obtain the iron ore concentrate of TFe grade more than 55%.
The ferric oxide ore that difficulty is selected can be changed into artificial magnetite by magnetizing roast, but compared with natural magnetite, artificial magnetite magnetic is more weak, coercivity is large, and after magnetic field induction, remanent magnetism is comparatively large, and therefore magnetic coagulation is serious, cause iron ore concentrate physics to be mingled with greatly, Iron grade only can reach 55% ~ 60%.
Summary of the invention
The technical problem to be solved in the present invention overcomes the deficiencies in the prior art, provide a kind of step simple, drop into low, the rate of recovery is stablized, the beneficiation method of the artificial magnetite of superior product quality.
For solving the problems of the technologies described above, the technical scheme that the present invention proposes is a kind of beneficiation method of artificial magnetite, comprises the following steps:
(1) be that raw material first carries out primary grinding with artificial magnetite;
(2) carrying out low intensity magnetic separation to the discharging after primary grinding throws except mine tailing;
(3) demagnetization of Strong shear stress is carried out successively to the mineral aggregate after step (2), secondary grinding, until artificial magnetite is with monomer output;
(4) the selected throwing of weak magnetic is carried out except mine tailing to the discharging after step (3);
(5) demagnetizer is adopted to demagnetize to the mineral aggregate after step (4);
(6) flotation is carried out to the mineral aggregate after step (5), finally obtain iron ore concentrate.
The beneficiation method of above-mentioned artificial magnetite, in described step (1), as the TFe content (mass fraction) of the artificial magnetite of raw material preferably more than 25%.
The beneficiation method of above-mentioned artificial magnetite, in described step (1), primary grinding preferably carries out in rod mill, and the grinding particle size of primary grinding preferably controls to account for 45% ~ 65% at-200 orders.
The beneficiation method of above-mentioned artificial magnetite, in described step (2), low intensity magnetic separation is preferably carried out in weak magnetic machine, and preferably, the mine tailing after low intensity magnetic separation is generally coarse grain low-grade tailings, and wherein Fe grade is below 8%, and mine tailing productive rate is 10% ~ 30%.
The beneficiation method of above-mentioned artificial magnetite, in described step (3), the demagnetization of Strong shear stress realizes preferably through cyclosizer.Cyclosizer feed pressure preferably controls at 0.04MPa ~ 0.4MPa, and feed thickness is preferably 10% ~ 35%.
The beneficiation method of above-mentioned artificial magnetite, in described step (3), it is monomer output that the grinding particle size of secondary grinding preferably controls at more than 95% of artificial magnetite raw material.
The beneficiation method of above-mentioned artificial magnetite, in described step (4), weak magnetic is selected preferably to carry out in weak magnetic machine; Preferred, in the mine tailing after weak magnetic is selected, Fe grade is below 11%, and mine tailing productive rate is 2% ~ 25%.
The beneficiation method of above-mentioned artificial magnetite, in described step (5), demagnetizer is high magnetic field intensity, high-frequency operation mode, and its magnetic field intensity is preferably at 1000 more than Oe, and the frequency of demagnetizer is preferably at more than 700Hz.
The beneficiation method of above-mentioned artificial magnetite, in described step (6), temperature during flotation preferably controls at 15 DEG C ~ 35 DEG C, and ore pulp mass concentration during flotation preferably controls 10% ~ 40%.
The beneficiation method of above-mentioned artificial magnetite, in described step (6), preferably, adopts sulfuric acid as adjusting agent, adopts ether amine as collecting agent (flotation desilication) during flotation; Flotation per ton is preferably 500g ~ 2000g to the consumption of sulfuric acid needed for ore deposit, and flotation per ton is preferably 50g ~ 300g to the consumption of ether amine needed for ore deposit.
Compared with prior art, the invention has the advantages that:
(1) the present invention by adopt multistage grinding, particularly primary grinding granularity is preferably controlled, throws except part coarse grain low-grade tailings, reduce secondary grinding ore grinding amount and power consume;
(2) the present invention by carrying out Strong shear stress demagnetization process (preferred Warman cyclone classification) before secondary grinding, is conducive to ensureing carrying out smoothly of secondary grinding;
(3) the present invention is by adopting multistage grinding, especially before flotation, carry out secondary grinding and its grinding particle size is preferably controlled, flotation ore deposit being measured and reduces further, save floating agent, alleviate floatation process intensity, be conducive to the effect ensureing flotation;
(4) the present invention by carrying out the demagnetization process of high magnetic field intensity (being preferably greater than 1000Oe) high-frequency (being preferably greater than 700Hz) before flotation, the generation of magnetic coagulation phenomenon can be greatly reduced, the gangue mineral that artificial magnetite and physics are mingled with is dispersity, further for flotation provides advantage;
(5) by being optimized layout to processing step of the present invention, process conditions of the present invention are controlled comprehensively, can ensure under the prerequisite that the rate of recovery is substantially constant, iron concentrate grade is improved (at least 2 ~ 5 percentage points) further, finally can obtain that TFe grade reaches 62% ~ 65%, full iron recovery reach 70% ~ 95% high-quality iron ore concentrate, this is for utilize artificial magnetite on a large scale from now on, and the problem solving China's iron ore underproduce provides prerequisite and basis.
Accompanying drawing explanation
Fig. 1 is the process chart of the beneficiation method of artificial magnetite of the present invention.
Detailed description of the invention
Below in conjunction with Figure of description and concrete preferred embodiment, the invention will be further described, but protection domain not thereby limiting the invention.
embodiment 1:
A beneficiation method for artificial magnetite of the present invention as shown in Figure 1, specifically comprises the following steps:
(1) with the artificial magnetite of yellow plum limonite for raw material, its main chemical compositions sees the following form 1, first carries out primary grinding; Primary grinding carries out in rod mill, and the grinding particle size of primary grinding controls to account for 55% at-200 orders;
Table 1: the main chemical compositions of artificial magnetite in embodiment 1
| Composition | TFe | SiO 2 | Al 2O 3 | CaO | MgO | MnO |
| Content (%) | 38.14 | 23.63 | 4.50 | 1.57 | 0.26 | 1.90 |
(2) carrying out low intensity magnetic separation to the discharging after primary grinding throws except mine tailing; Low intensity magnetic separation carries out in weak magnetic machine, and the mine tailing after low intensity magnetic separation is coarse grain low-grade tailings, and wherein Fe grade is 7.43%, and mine tailing productive rate is 21%;
(3) carry out the demagnetization of Strong shear stress successively to the mineral aggregate after step (2), the demagnetization of Strong shear stress realizes (at 0.04MPa ~ 0.4MPa, feed thickness is 10% ~ 35% to cyclosizer feed pressure) by Warman cyclosizer; Carry out secondary grinding after demagnetization, the grinding particle size of secondary grinding controls to account for 85% at-200 orders, and makes more than 95% of artificial magnetite raw material in monomer output;
(4) the selected throwing of weak magnetic is carried out except mine tailing to the discharging after step (3); Weak magnetic is selected is carry out in weak magnetic machine; In mine tailing after weak magnetic is selected, Fe grade is 10.68%, and mine tailing productive rate is 8%;
(5) demagnetizer is adopted to demagnetize to the mineral aggregate after step (4); Demagnetizer is high magnetic field intensity, high-frequency operation mode, and its magnetic field intensity is 1000 Oe, and the frequency of demagnetizer is 790Hz;
(6) carry out flotation to the mineral aggregate after step (5), temperature during flotation controls at 18 DEG C, and ore pulp mass concentration during flotation controls 30%, adopts sulfuric acid as adjusting agent during flotation, adopts ether amine as collecting agent; The consumption of sulfuric acid be 500g/t flotation to ore deposit, the consumption of ether amine be 250g/t flotation to ore deposit, the final iron concentrate grade obtained reaches 62%, and full iron recovery reaches 92%.
embodiment 2:
A beneficiation method for artificial magnetite of the present invention as shown in Figure 1, specifically comprises the following steps:
(1) with the artificial magnetite of Datong oolitic hematite for raw material, its main chemical compositions sees the following form 2, first carries out primary grinding; Primary grinding carries out in rod mill, and the grinding particle size of primary grinding controls to account for 55% at-200 orders;
Table 2: the main chemical compositions of artificial magnetite in embodiment 2
| Composition | TFe | SiO 2 | Al 2O 3 | CaO | MgO | MnO |
| Content (%) | 38.15 | 39.30 | 2.31 | 0.24 | 0.28 | 0.096 |
(2) carrying out low intensity magnetic separation to the discharging after primary grinding throws except mine tailing; Low intensity magnetic separation carries out in weak magnetic machine, and the mine tailing after low intensity magnetic separation is coarse grain low-grade tailings, and wherein Fe grade is 7.88%, and mine tailing productive rate is 24%;
(3) carry out the demagnetization of Strong shear stress successively to the mineral aggregate after step (2), the demagnetization of Strong shear stress realizes (at 0.04MPa ~ 0.4MPa, feed thickness is 10% ~ 35% to cyclosizer feed pressure) by Warman cyclosizer; Carry out secondary grinding after demagnetization, the grinding particle size of secondary grinding controls to account for 92% at-325 orders, and makes more than 95% of artificial magnetite raw material in monomer output;
(4) the selected throwing of weak magnetic is carried out except mine tailing to the discharging after step (3); Weak magnetic is selected is carry out in weak magnetic machine; In mine tailing after weak magnetic is selected, Fe grade is 10.94%, and mine tailing productive rate is 17%;
(5) demagnetizer is adopted to demagnetize to the mineral aggregate after step (4); Demagnetizer is high magnetic field intensity, high-frequency operation mode, and its magnetic field intensity is 1000 Oe, and the frequency of demagnetizer is 790Hz;
(6) carry out flotation to the mineral aggregate after step (5), temperature during flotation controls at 25 DEG C, and ore pulp mass concentration during flotation controls 35%, adopts sulfuric acid as adjusting agent during flotation, adopts ether amine as collecting agent; The consumption of sulfuric acid be 750g/t flotation to ore deposit, the consumption of ether amine be 200g/t flotation to ore deposit, the final iron concentrate grade obtained reaches 64%, and full iron recovery reaches 81%.
embodiment 3:
A beneficiation method for artificial magnetite of the present invention as shown in Figure 1, specifically comprises the following steps:
(1) with the artificial magnetite of Kazakhstan's siderite for raw material, its main chemical compositions sees the following form 3, first carries out primary grinding; Primary grinding carries out in rod mill, and the grinding particle size of primary grinding controls to account for 45% at-200 orders;
Table 3: the main chemical compositions of artificial magnetite in embodiment 3
| Composition | TFe | SiO 2 | Al 2O 3 | CaO | MgO | MnO |
| Content (%) | 42.25 | 29.13 | 1.35 | 0.78 | 0.91 | 1.32 |
(2) carrying out low intensity magnetic separation to the discharging after primary grinding throws except mine tailing; Low intensity magnetic separation carries out in weak magnetic machine, and the mine tailing after low intensity magnetic separation is coarse grain low-grade tailings, and wherein Fe grade is 7.46%, and mine tailing productive rate is 21%;
(3) carry out the demagnetization of Strong shear stress successively to the mineral aggregate after step (2), the demagnetization of Strong shear stress realizes (at 0.04MPa ~ 0.4MPa, feed thickness is 10% ~ 35% to cyclosizer feed pressure) by Warman cyclosizer; Carry out secondary grinding after demagnetization, the grinding particle size of secondary grinding controls to account for 70% at-200 orders, and makes more than 95% of artificial magnetite raw material in monomer output;
(4) the selected throwing of weak magnetic is carried out except mine tailing to the discharging after step (3); Weak magnetic is selected is carry out in weak magnetic machine; In mine tailing after weak magnetic is selected, Fe grade is 10.17%, and mine tailing productive rate is 3%;
(5) demagnetizer is adopted to demagnetize to the mineral aggregate after step (4); Demagnetizer is high magnetic field intensity, high-frequency operation mode, and its magnetic field intensity is 1000 Oe, and the frequency of demagnetizer is 790Hz;
(6) carry out flotation to the mineral aggregate after step (5), temperature during flotation controls at 20 DEG C, and ore pulp mass concentration during flotation controls 33%, adopts sulfuric acid as adjusting agent during flotation, adopts ether amine as collecting agent; The consumption of sulfuric acid be 1000g/t flotation to ore deposit, the consumption of ether amine be 150g/t flotation to ore deposit, the final iron concentrate grade obtained reaches 63%, and full iron recovery reaches 81%.
Claims (4)
1. a beneficiation method for artificial magnetite, comprises the following steps:
(1) be that raw material first carries out primary grinding with artificial magnetite; Primary grinding carries out in rod mill, and the grinding particle size of primary grinding controls to account for 45% ~ 65% at-200 orders;
(2) carrying out low intensity magnetic separation to the discharging after primary grinding throws except mine tailing;
(3) demagnetization of Strong shear stress is carried out successively to the mineral aggregate after step (2), secondary grinding, until artificial magnetite is with monomer output; The demagnetization of Strong shear stress is realized by cyclosizer, and cyclosizer feed pressure is at 0.04MPa ~ 0.4MPa, and feed thickness is 10% ~ 35%; It is monomer output that the grinding particle size of secondary grinding controls at more than 95% of artificial magnetite raw material;
(4) the selected throwing of weak magnetic is carried out except mine tailing to the discharging after step (3);
(5) demagnetizer is adopted to demagnetize to the mineral aggregate after step (4); The magnetic field intensity of demagnetizer is at 1000 more than Oe, and the frequency of demagnetizer is at more than 700Hz;
(6) flotation is carried out to the mineral aggregate after step (5), finally obtain iron ore concentrate; Temperature during flotation controls at 15 DEG C ~ 35 DEG C, and ore pulp mass concentration during flotation controls 10% ~ 40%; Adopt sulfuric acid as adjusting agent during flotation, adopt ether amine as collecting agent; Flotation per ton is 500g ~ 2000g to the consumption of sulfuric acid needed for ore deposit, and flotation per ton is 50g ~ 300g to the consumption of ether amine needed for ore deposit.
2. the beneficiation method of artificial magnetite according to claim 1, is characterized in that: in described step (1), as the TFe content of the artificial magnetite of raw material more than 25%.
3. the beneficiation method of artificial magnetite according to claim 1, is characterized in that: in described step (2), and low intensity magnetic separation carries out in weak magnetic machine, and in the mine tailing after low intensity magnetic separation, Fe grade is below 8%, and mine tailing productive rate is 10% ~ 30%.
4. the beneficiation method of artificial magnetite according to claim 1, is characterized in that: in described step (4), and weak magnetic is selected is carry out in weak magnetic machine, and in the mine tailing after weak magnetic is selected, Fe grade is below 11%, and mine tailing productive rate is 2% ~ 25%.
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| CN105233949B (en) * | 2015-10-23 | 2018-03-06 | 首钢总公司 | A kind of beneficiation method of sulfur-containing magnetite |
| CN108486362A (en) * | 2018-05-28 | 2018-09-04 | 东北大学 | It is a kind of that carbonaceous pelletizing mine, its pellet and its smelting process are prepared using bloodstone |
| CN112090578B (en) * | 2020-09-09 | 2022-03-11 | 中钢集团马鞍山矿山研究总院股份有限公司 | Beneficiation method for preparing ultrapure iron concentrate by using magnetite concentrate |
| CN112121992A (en) * | 2020-09-16 | 2020-12-25 | 安徽马钢张庄矿业有限责任公司 | High-grade iron ore concentrate beneficiation method |
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| CN101428248A (en) * | 2008-11-04 | 2009-05-13 | 中钢集团马鞍山矿山研究院有限公司 | Beneficiation method for recycling specularite |
| CN101564707A (en) * | 2009-05-15 | 2009-10-28 | 四川安宁铁钛股份有限公司 | Vanadium titano-magnetite screen method |
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| 《广西某赤褐铁矿选矿试验研究》;张汉泉等;《武汉工程大学学报》;20100315;第32卷(第3期);第49-53页 * |
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