CN102441480B - Purely physical dressing method for hematite - Google Patents
Purely physical dressing method for hematite Download PDFInfo
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- CN102441480B CN102441480B CN 201110247928 CN201110247928A CN102441480B CN 102441480 B CN102441480 B CN 102441480B CN 201110247928 CN201110247928 CN 201110247928 CN 201110247928 A CN201110247928 A CN 201110247928A CN 102441480 B CN102441480 B CN 102441480B
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Abstract
The invention discloses a purely physical dressing method for hematite. In the method, superfine processing of mineral is realized by combining steps of multistage grinding, weak magnetic separation, strong magnetic separation and centrifuge desliming; after four-stage grinding, the fineness of the mineral can reach -400 meshes to -600 meshes; then the weak magnetic separation is combined with the strong magnetic separation to perform micro-particle dressing; and a centrifuge is used for desliming to finally obtain a 63-degree concentrate product. The method has the advantages of simple equipment and low cost; the cost of the concentrate of over 63 degree in grade per ton is 60-70 percent lower than that of the prior art; the resource utilization rate is high, and tailings obtained by hematite dressing in the prior art can be dressed again; meanwhile, a purely physical method is adopted, the discharged wastewater dose not contain chemical pollutants, and the environmental protection requirement are met.
Description
Technical field:
The present invention relates to the technique of preparing field, particularly the pure physical upgrading method of a kind of bloodstone.
Background technology:
At present, ore-dressing technique adopts stage grinding more in the exploitation of China's bloodstone, thickness grading, and the method that magnetic separation combines with flotation, there is following defective in this method: the floatation process complexity, beneficiation cost is higher, and the rate of recovery is low; And flotation is added with chemicals NaOH etc., and the sewage of discharging in the ore dressing process influences crop growth, causes only long seedling, not Hua Sui etc.
Summary of the invention:
The objective of the invention is to overcome the above-mentioned defective of prior art hematite separation method, provide a kind of hematite separation cost lower, fund input is few, technology is simple relatively, the resource utilization height, can screen the microparticle mineral, and field-crop not produced the pure physical upgrading method of bloodstone of adverse effect.This method is equally applicable to magnetic iron ore, mixes the screening in ore deposit.Technical scheme of the present invention is the pure physical upgrading method of a kind of bloodstone, comprise fragmentation, ore grinding, all operations of magnetic separation, it is characterized in that stage grinding and low intensity magnetic separation, high intensity magnetic separation, each operation of centrifuge desliming are appropriately made up, this method is physical process all, comprises the steps:
1) at first with the mineral fragmentation, enters primary grinding, be milled to-200 order fineness and reach 30%-50%;
2) muck enters one section low intensity magnetic separation behind the primary grinding, and the concentrate of one section low intensity magnetic separation enters the 1st group of secondary grinding, is milled to-325 order fineness and reaches 95%, obtains the concentrate product that grade is 63 degree again after the 1st group of two sections low intensity magnetic separations; The tailings of one section low intensity magnetic separation enters one section high intensity magnetic separation, and the tailings of the 1st group of two sections low intensity magnetic separations also enters one section high intensity magnetic separation; The tailings control that one section high intensity magnetic separation produces is below 12 degree, and discharging is abandoned;
3) concentrate of one section high intensity magnetic separation enters second group of secondary grinding, is milled to-325 purpose fineness and reaches 95%, obtains the qualified products that grade is 63 degree through the 2nd group of second section low intensity magnetic separation again, and remaining tailings enters two sections high intensity magnetic separations;
4) two sections selected concentrate of high intensity magnetic separation enter one section centrifuge, and the tailings of two sections high intensity magnetic separations flows into the cyclone group;
5) one section centrifuge is selected the concentrate product that grade is 63 degree, and its tailings flows into the cyclone group;
6) cyclone group underflow partly enters three sections ore grindings, grind fineness more than-400 orders, enter three sections high intensity magnetic separations again, the overflow portion of cyclone group also enters three sections high intensity magnetic separations;
7) three sections concentrate that high intensity magnetic separation is selected advance two sections centrifuges again, and two sections centrifuges are selected the concentrate product that grade is 63 degree, and two sections centrifuge tailings enter four sections high intensity magnetic separations, and the tailings of three sections high intensity magnetic separations also enters four sections high intensity magnetic separations;
8) four sections high intensity magnetic separations, the control tailings is below 12 degree, and discharging is abandoned, and concentrate enters the cyclone group, makes it to form the closed cycle pattern;
Above-mentioned low intensity magnetic separation adopts magnetic to roll ore dressing, and the magnetic field intensity that magnetic rolls is 3000 Gausses.
Above-mentioned high intensity magnetic separation is to adopt the ore dressing of strong magnetic machine, and strong magnetic machine magnetic field intensity is greater than 8000 Gausses.
Advantage of the present invention is:
1. device simple, cost is low, and the method that adds flotation with existing magnetic separation relatively can reduce cost 60%～70% or more.
2. resource utilization height, the present invention can carry out ultra fine to mineral, in secondary grinding to the three section grinding process through the centrifuge desliming, the ore powder granularity that obtains to four sections ore grindings reaches-400 orders to-600 orders or to more tiny, thereby can carry out ore dressing again to the tailings of abandoning behind the prior art hematite separation, improve resource utilization and concentrate elimination factor.
3. the present invention adopts pure physical method, and the waste water of discharging in ore dressing process does not contain chemical pollutant, compliance with environmental protection requirements.
Description of drawings:
Fig. 1 is the pure physical upgrading method of bloodstone of the present invention process flow diagram
The specific embodiment:
The practical specific embodiment of the inventive method further specifies as follows referring to accompanying drawing:
The pure physical upgrading method of a kind of bloodstone, it is with stage grinding, low intensity magnetic separation, high intensity magnetic separation, appropriate the combining of each operation of centrifuge desliming, mineral are carried out than the more processing of refinement of prior art beneficiation method, the realization microparticle more tiny than the mineral microparticle of prior art beneficiation method carries out pure physical upgrading, thereby broken through the some shortcomings of prior art hematite separation.The step of the inventive method is:
1) at first with the mineral fragmentation, enters primary grinding, be milled to-200 order fineness and reach 30%-50%;
2) muck enters one section low intensity magnetic separation behind the primary grinding, and the concentrate of one section low intensity magnetic separation enters the 1st group of secondary grinding, is milled to-325 order fineness and reaches 95%, obtains the concentrate product that grade is 63 degree again after the 1st group of two sections low intensity magnetic separations; The tailings of one section low intensity magnetic separation enters one section high intensity magnetic separation, and the tailings of the 1st group of two sections low intensity magnetic separations also enters one section high intensity magnetic separation; One section selected concentrate grade of high intensity magnetic separation reaches more than 30 degree, and the tailings control that one section high intensity magnetic separation produces is below 12 degree, and discharging is abandoned;
3) concentrate of one section high intensity magnetic separation enters the 2nd group of secondary grinding, is milled to-325 purpose fineness and reaches 95%, obtains the qualified products that grade is 63 degree through the 2nd group of second section low intensity magnetic separation again, and remaining tailings enters two sections high intensity magnetic separations;
4) two sections selected grade concentrate more than 45 degree of high intensity magnetic separation enter one section centrifuge, and the tailings of two sections high intensity magnetic separations flows into the cyclone group;
5) one section centrifuge is selected the concentrate product that grade is 63 degree, and its tailings flows into the cyclone group;
6) cyclone group underflow partly enters three sections ore grindings, grind fineness more than-400 orders, enter three sections high intensity magnetic separations again, the overflow portion of cyclone group also enters three sections high intensity magnetic separations;
7) three sections grade concentrate more than 45 degree that high intensity magnetic separation is selected advance two sections centrifuges again, and two sections centrifuges are selected the concentrate product that grade is 63 degree, and two sections centrifuge tailings enter four sections high intensity magnetic separations, and the tailings of three sections high intensity magnetic separations also enters four sections high intensity magnetic separations;
8) four sections high intensity magnetic separations, the control tailings is below 12 degree, and discharging is abandoned, and concentrate enters the cyclone group, makes it to form the closed cycle pattern.
Above-mentioned low intensity magnetic separation adopts magnetic to roll ore dressing, and the magnetic field intensity that magnetic rolls is 3000 Gausses.
Above-mentioned high intensity magnetic separation is to adopt the ore dressing of strong magnetic machine, and strong magnetic machine magnetic field intensity is greater than 8000 Gausses.
The inventive method is used enforcement in the Qidong, Hunan Province along the mine that reaches mining industry Co., Ltd.
The technological core of the inventive method is that a kind of pure physical upgrading method is adopted in the ore dressing of bloodstone, with ore grinding, low intensity magnetic separation, high intensity magnetic separation, appropriate the combining of each operation of centrifuge desliming, mineral are carried out ultra fine, in the multistage grinding thinning process in conjunction with the centrifuge desliming, make the mineral fineness reach-400 orders to-600 orders or to more tiny, combine with high intensity magnetic separation through low intensity magnetic separation again and carry out ore dressing, thereby can realize the microparticle ore dressing more tiny than prior art, the mineral grain fineness of prior art hematite separation is minimal to about-400 orders.The inventive method can be carried out ore dressing to being utilized once again by the tailings of being abandoned after the ore dressing of the common hematite separation method of prior art, therefore both can reduce cost significantly, can improve resource utilization and concentrate elimination factor simultaneously again; In addition, the inventive method adopts ore grinding, low intensity magnetic separation, high intensity magnetic separation, each operation combination of centrifuge desliming to realize ore dressing, and all operation is pure physical process, and the waste water of generation does not contain chemical pollutant, and the waste water of discharge is to not infringement of field-crop, compliance with environmental protection requirements.
Claims (3)
1. pure physical upgrading method of bloodstone, comprise fragmentation, ore grinding, magnetic separation operation, it is characterized in that stage grinding and low intensity magnetic separation, high intensity magnetic separation, each operation of centrifuge desliming are appropriately made up, mineral are carried out ultra fine, this method is physical process all, comprises the steps:
1) at first with the mineral fragmentation, enters primary grinding, be milled to-200 order fineness and reach 30%-50%;
2) muck enters one section low intensity magnetic separation behind the primary grinding, and the concentrate of one section low intensity magnetic separation enters the 1st group of secondary grinding, is milled to-325 order fineness and reaches 95%, obtains the concentrate product that taste is 63 degree again after the 1st group of two sections low intensity magnetic separations; The tailings of one section low intensity magnetic separation enters one section high intensity magnetic separation, and the tailings of the 1st group of two sections low intensity magnetic separations also enters one section high intensity magnetic separation; The tailings control that one section high intensity magnetic separation produces is below 12 degree, and discharging is abandoned;
3) concentrate of one section high intensity magnetic separation enters the 2nd group of secondary grinding, is milled to-325 purpose fineness and reaches 95%, obtains the concentrate product that grade is 63 degree through the 2nd group of second section low intensity magnetic separation again, and remaining tailings enters two sections high intensity magnetic separations;
4) two sections selected concentrate of high intensity magnetic separation enter one section centrifuge, and tailings flows into the cyclone group;
5) one section centrifuge is selected the concentrate product that grade is 63 degree, and tailings flows into the cyclone group simultaneously;
6) cyclone group underflow partly enters three sections ore grindings, is milled to-400 order fineness, enters three sections high intensity magnetic separations again, and the overflow portion of cyclone group also enters three sections high intensity magnetic separations;
7) three sections concentrate that high intensity magnetic separation is selected enter two sections centrifuges again, and two sections centrifuges are selected the concentrate product that grade is 63 degree, and two sections centrifuge tailings enter four sections high intensity magnetic separations, and the tailings of three sections high intensity magnetic separations also enters four sections high intensity magnetic separations;
8) four sections high intensity magnetic separations, the control tailings is below 12 degree, and discharging is abandoned, and concentrate enters the cyclone group, makes it to form the closed cycle pattern.
2. the pure physical upgrading method of bloodstone according to claim 1 is characterized in that described low intensity magnetic separation employing magnetic rolls ore dressing, and the magnetic field intensity that magnetic rolls is 3000 Gausses.
3. the pure physical upgrading method of bloodstone according to claim 1 is characterized in that described high intensity magnetic separation is to adopt the ore dressing of strong magnetic machine, and strong magnetic machine magnetic field intensity is greater than 8000 Gausses.
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201110247928 CN102441480B (en) | 2011-08-26 | 2011-08-26 | Purely physical dressing method for hematite |
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| CN 201110247928 CN102441480B (en) | 2011-08-26 | 2011-08-26 | Purely physical dressing method for hematite |
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| CN102441480A CN102441480A (en) | 2012-05-09 |
| CN102441480B true CN102441480B (en) | 2013-08-14 |
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| CN102784712B (en) * | 2012-08-17 | 2014-10-08 | 长沙矿冶研究院有限责任公司 | Mineral processing technology for low-grade fine-grain embedded refractory iron ores |
| CN102886301B (en) * | 2012-09-27 | 2015-06-17 | 肖厚礼 | Hematite beneficiation method |
| CN102872973B (en) * | 2012-09-29 | 2015-06-10 | 河北联合大学 | High-mud micro-fine particle lean hematite separation process |
| CN102909124B (en) * | 2012-10-26 | 2014-07-30 | 玉溪大红山矿业有限公司 | Iron-increasing and silicon-reducing reselection technique for mixed-type lean iron ore tailings |
| CN104689905B (en) * | 2015-02-10 | 2017-01-11 | 玉溪大红山矿业有限公司 | Mineral processing process for improving quality and reducing silicon of iron ore concentrate |
| CN109718946B (en) * | 2019-03-20 | 2020-05-19 | 中钢集团马鞍山矿山研究院有限公司 | Non-flotation method for magnetic-hematite mixed iron ore |
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| CN101413057B (en) * | 2008-03-05 | 2011-03-30 | 中南大学 | Method for efficiently separating low-ore grade and complicated iron ore |
| RU2366511C1 (en) * | 2008-04-17 | 2009-09-10 | Государственное образовательное учреждение высшего профессионального образования "Московский государственный горный университет" (МГГУ) | Iron-bearing ore benefication method |
| CN101579654A (en) * | 2009-05-26 | 2009-11-18 | 包头市石宝铁矿集团有限责任公司 | Iron ore powder mineral dressing process |
| CN102019226B (en) * | 2009-09-18 | 2012-11-28 | 鞍钢集团矿业公司 | Magnetic-gravity combined separation process for magnetite |
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