CN1265890C - Combined mineral separation technology process for producing iron refine ore powder containing magnetic iron ore - Google Patents
Combined mineral separation technology process for producing iron refine ore powder containing magnetic iron ore Download PDFInfo
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- CN1265890C CN1265890C CN 200410082955 CN200410082955A CN1265890C CN 1265890 C CN1265890 C CN 1265890C CN 200410082955 CN200410082955 CN 200410082955 CN 200410082955 A CN200410082955 A CN 200410082955A CN 1265890 C CN1265890 C CN 1265890C
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Abstract
The present invention relates to a dry and wet combined beneficiation technological method of a magnetite, which mainly carries out three-stage magnetic separation processing to powdered ore. Then the magnetic separation of wet materials is carried out, the adopted magnetic field strength for magnetic separation is from 400 to 1200GS, the rotation speed of a magnetic force roller is 60 to 320 revolutions per minute, and the wet materials are made into finished product iron ore concentrate powder through dehydration. After magnetic separation is carried out to a general ore of which the iron content is 35% by using the method, the iron content of the iron ore concentrate powder can reach 68 to 70%. The combined process method of the present invention has the advantages of water saving, reduced cost, small water use amount in the technological process and reduced pollution; the ore utilization rate can reach 90%, dust in the magnetic separation is captured by a dust removal device, and no air pollution is caused. The method of the present invention is a technological method having the characteristics of high productive efficiency, good product quality, no environment pollution and creation.
Description
Technical field: the present invention relates to a kind of mining industry beneficiation method, relate to the wet combination method ore-dressing technique method of doing of a kind of magnetic iron ore specifically.
Background technology: contain magnetic iron ore and produce fine iron breeze and adopt wet dressing in now producing, this method production history is long, the ore-dressing technique maturation, having major defect is that the ore resource utilization rate is lower, generally below 75%, and water consumption is higher, and one ton of fine iron breeze of every production needs 3.45 tons of water consumptions, and pollutes big, the magnetic separator magnetic field intensity is 1550～1750GS, under the strong magnetic field action, bring the impurity content height of fine iron breeze into, therefore lower to lean ore and difficult ore dressing finished product fine iron breeze quality, inaccessible standard-required, its sale price is lower, directly influences the business economic benefit, and dry method and wet method are also produced fine iron breeze with low magnetic and do not appeared in the newspapers as yet.
Summary of the invention: the present invention is directed to the existing problem of existing wet production fine iron breeze, a kind of ore utilization rate height, water saving, little, the fine iron breeze quality height of pollution are provided, can be used for the dried wet combined mineral dressing technology method of the fine iron breeze of lean ore and difficult ore dressing.For solving the existing problem of existing wet production fine iron breeze, of the present inventionly contain magnetic iron ore to produce fine iron breeze combined mineral dressing technology method as follows:
Technical process:
Ore particle diameter＞50mm, promptly carry out coarse crushing through fragmentation, particle diameter is 30～50mm after the coarse crushing, ore after the coarse crushing enters fine crusher and is crushed to ore particle diameter＜30mm, ore after in small, broken bits enters flour mill and makes 80～140 order breezes, breeze enters dryer, bake out temperature is 100～300 ℃, oven dry back moisture content is less than 1%, oven dry back breeze enters I level magnetic separator, the magnetic separator magnetic field intensity is 900～1200GS, the magnetic drum rotating speed is 60～180 rev/mins, iron powder enters II level magnetic separator after the magnetic separation, magnetic field intensity is 700～900GS, the magnetic drum rotating speed is 200～270 rev/mins, iron powder after the magnetic separation enters III level magnetic separator, magnetic field intensity is 400～700GS, 280～320 rev/mins of magnetic drum rotating speeds, iron powder enters iron powder slurry make-up tank after the magnetic separation, iron powder is 1: 1～1.5 with the water quality ratio, under agitation mix, mixing speed is 60～80 rev/mins, and the iron powder slurry that stirs enters sloughing-off tank, slag is sedimentation in sloughing-off tank, discharge sloughing-off tank, slag is sent into dewaterer, and the water of deviating from is sent into iron powder slurry make-up tank and recycled, slag transports outside the venue, iron powder slurry after the desliming is with being pumped into the wet feed magnetic separator, and the magnetic separator magnetic field intensity is 900～1250GS, 280～320 rev/mins of magnetic drum rotating speeds, fine iron breeze is sent into dewaterer after the magnetic separation, dewater to water content 8～10%, make fine iron breeze, the water of deviating from enters the wet feed magnetic separator and recycles.
Ore coarse crushing, in small, broken bits, indication range that abrasive dust is controlled are that non-selective index is processing back breeze particle size distribution data.Bake out temperature is that the hot-air seasoning import is to the outlet temperature scope.Breeze oven dry back is loose, is easy to magnetic separation, and the breeze water content is lower, can not dry.
Magnetic separation magnetic field intensities at different levels, magnetic drum rotating speed are mainly selected according to ore magnetic susceptibility, magnetic susceptibility is more than 70%: magnetic field intensity is 400～900GS, magnetic susceptibility 50～70%: magnetic field intensity is 500～1000GS, magnetic susceptibility is lower than 50%: magnetic field intensity 600～1200GS, because of aqueous medium influences the wet feed magnetic separation, magnetic field intensity is 900～1250GS, and the selection magnetic field intensity will be in conjunction with magnetic separator equipment, and general magnetic separator magnetic field intensity is and is fixed on the certain limit.The magnetic drum rotating speed also determines according to breeze removing impurities difficulty or ease, can be fast for easy ore dressing rotating speed, and III level magnetic separation magnetic drum rotating speed is higher than II level magnetic separation magnetic drum rotating speed.
On every dry separation magnetic separator dust arrester is housed, can captures the dust that produces in the processing effectively.Technology of the present invention can adopt continued operation or intermittently operated.
According to method of the present invention, to Fe
3O
420～50% (same under the mass parts),
FeS
21～20%, Fe
2O
35～20%, ferrosilite 1～15%, SiO
215～30% ore carries out the associating magnetic separation, and its fine iron breeze can reach Fe:68～70%:Si:2～5%;
S:0.001～0.5%; P:0.001～0.08%; Its technical indicator surpasses Ministry of Metallurgical Industry contains Fe 65% to fine iron breeze requirement.
Method of the present invention: be applicable to the magnetic iron ore of easy choosing, be applicable to the sedimentary rock ore that crystalline particle is superfine yet, sulphur iron ore, high silicon iron ore are not suitable for bloodstone stone and non-magnetic iron stone.
The principle of the inventive method ore dressing and effect: in wet method, adopt the highfield of 1550～1750GS that mud is carried out magnetic separation, and this magnetic field intensity is always for generally acknowledging, study and select for use low magnetic field intensity to carry out magnetic separation nobody, along with the minimizing of rich ore amount with to the exploitation of lean ore and difficult ore dressing, original wet method is inapplicable, its reason is: lean ore is under the effect of highfield, some impurity enter in the finished product with iron powder, cause the fine iron breeze iron-holder to be difficult to reach requirement, and the wet production water consumption is big, area for some water resources shortages, adopt wet production more difficult, three grades of dry magnetic separations are mainly selected magnetic field intensity according to ore magnetic susceptibility, under this magnetic field intensity, iron powder is adsorbed on the magnetic drum, and impurity seldom is brought into, especially three grades of magnetic separation are lower in the magnetic field intensity that the III level adopts, except that iron powder, other is as sulfur-bearing, impurity such as phosphorus and silicon then is discharged in the slag, so sulphur in the iron powder, phosphorus, the content of silicon is low, the magnetic separator that combined mineral dressing technology method of the present invention is selected is because magnetic drum is 270 degree magnetic field areas, this is bigger more than 1/3 than common magnetic drum 130～180 degree magnetic field areas, help enhancing productivity, magnet in the magnetic drum is a magnet, cause field region having, replace variation continuously, in change procedure, iron powder is along with magnetic field has, no change and beating, help the removing of impurity, magnetic drum is controlled by variable-frequency motor, the constant speed drive of the general magnetic separator magnetic drum of its rotating speed regulating ratio has than remarkable advantages, select different rotating speeds for use according to different ore kinds, the breeze that magnetic susceptibility is higher, can adopt 280～320 times/minute, production efficiency height like this, and adopt 60～70 times/minute for the lower breeze of magnetic susceptibility, then can effectively iron powder be screened, behind three grades of dry magnetic separations, the iron powder iron content reaches 65%, further magnetic separation makes sulphur through wet feed with the iron powder after the dry separation, the phosphorus objectionable impurities reduces more than 50%, help the later stage smelting, and the fine iron breeze iron-holder improves 3～5%, and according to existing fine iron breeze selling price, with 65% is radix, every raising 1%, price per ton can improve 20～50 yuan, thereby economic benefit is considerable.This method iron in ore utilization rate is calculated by ore magnetic susceptibility and can be reached more than 90%, makes full use of resource, reduces production costs.
Because the inventive method water consumption is few, only be 1/5 of wet method water consumption, and most of water recycle, wastewater discharge is few, the minimizing environmental pollution, fine iron breeze is moisture few, alleviates the transportation burden.The dust that produces in the production process is captured by deduster, can not cause dust atmosphere to pollute, and in sum, combination method magnetic separation iron ore is a kind of production efficiency height, good product quality, the creative process of non-environmental-pollution.
The specific embodiment:
Embodiment 1:
Ore source: the bottom of a pan, Dashiqiao City, Liaoning Province iron ore
Technical indicator: ore particle diameter: 50～100mm; Main component (mass fraction):
Fe 38% Si 13% S 0.8% magnetic susceptibility 85%
Process:
Adopt continuous process, ore inlet amount 16t/h delivers to the coarse crushing disintegrating machine by IG4 electro-vibrating feeder (production of Chaoyang Heavy Machinery Plant) with ore;
1, coarse crushing:
Equipment: PE250 * 400 jaw crushers (production of Chaoyang Heavy Machinery Plant)
Disposal ability: 18t/h
Grinding particle size: 30～50mm; Ore enters equipment in small, broken bits after the coarse crushing.
2, in small, broken bits:
Equipment: PEX150 * 750 jaw crushers (production of Chaoyang Heavy Machinery Plant)
Disposal ability: 18t/h
Particle diameter＜30mm; Back in small, broken bits ore is sent into abrasive dust equipment.
3, abrasive dust:
Equipment: the 5R4119 thunder covers pulverizer (Dashiqiao City Hong Guangjixiechang production)
Disposal ability: 18t/h
Diameter of particle: 80～140 orders; Breeze is sent into dryer behind the abrasive dust
4, oven dry: 280 ℃ of inlet temperatures, 120 ℃ of outlet temperatures, oven dry back breeze water content＜1%, oven dry back breeze carries out the magnetic separation of I level;
5, I level magnetic separation:
Equipment: GXT-18 magnetic separator (Dashiqiao City Practical science technical research institute)
Cylinder magnetic field area is 270 degree discs;
Magnetic field hunting frequency: 120 times/minute;
Disposal ability is 18t/h
Magnetic field intensity: 600～800GS (being magnetic separator magnetic field intensity scope, down together)
Magnetic drum rotating speed: 180 rev/mins; Iron powder is sent into II level magnetic separator after the magnetic separation of I level.
6, II level magnetic separation:
Equipment: the same
Magnetic field intensity: 600～800GS
Magnetic drum rotating speed: 300 rev/mins; Iron powder is sent into III level magnetic separator after the magnetic separation of II level.
7, III level magnetic separation:
Equipment: the same
Magnetic field intensity: 400～600GS
Magnetic drum rotating speed: 320 rev/mins;
Iron powder technical indicator after the magnetic separation:
Fe?66.67％ Si?5.28％ S?1.24％ P?0.005％
After the magnetic separation of III level, iron powder is sent into iron powder slurry make-up tank.
8, iron powder slurry preparation:
Equipment: XG-2000 tank diameter paddle agitator (Dashiqiao City Practical science technical research is made)
The mass ratio of iron powder and water is 1: 1.2;
Mixing speed: 65 rev/mins; The iron powder slurry that stirs is sent into sloughing-off tank.
9, desliming:
Equipment: CS-16 permanent magnetism drench pit (Dashiqiao City Practical science technical research is made)
Iron powder is sent into the wet feed magnetic separator after the desliming, and slag mud is sent into dewaterer.
10, wet feed magnetic separation:
Equipment: CTB-1204 permanent-magnet drum type magnetic separator (Dashiqiao City Practical science technical research is made)
Magnetic field intensity: 900～1250GS
Magnetic drum rotating speed: 320 rev/mins;
Fine iron breeze is sent into dewaterer after the wet feed magnetic separation.
11, dehydration:
Equipment: GYW-18 cartridge type outside filtering type vacuum and permanent magnet filter (Dashiqiao City Practical science technical research is made)
Moisture content is controlled at 8～10%; Gained dehydration back product is the finished iron fine ore, and the water of deviating from is sent into the wet feed magnetic separator and recycled.
The slag mud of being discharged by desliming is deviate from water and is sent into iron powder slurry make-up tank and recycle.
The technical indicator of finished iron fine ore:
Fe：69.12％；Si：2.73％；S：0.05％；P：0.002％；
Mine tailing contains Fe:3.2%;
Deduster is housed on magnetic separator, captures dust in the process, to adopting the conveyer belt transported material the magnetic separation of III level, slag is drained on the conveyer belt by the magnetic separator slag outlet and transports after the magnetic separation from the ore coarse crushing, carries with slush pump from iron powder slurry to dehydration.
The magnetic separator that this technology is selected, the magnetic field swing on the magnetic drum can have or not regional change, helps the removing of slag
The norm quota of consumption:
Iron ore extract powder per ton calculates
Ore: 2.15t; : 35w; Water: 0.6t;
Contrast method: wet method contrast routinely:
Fine iron breeze Fe:64.02%; Si:8.34%; S:0.43%;
H
2O：15～20％；
Mine tailing iron-holder: T 14.35%;
The norm quota of consumption: fine iron breeze per ton calculates:
Ore: 2.52t; : 40w; Water: 3.45t.
Embodiment 2:
Ore source: the bottom of a pan, Dashiqiao City, Liaoning Province iron ore
Technical indicator: ore particle diameter: 50～100mm; Main component (mass fraction):
Fe 35.5% Si 16.5% S 1.24% magnetic susceptibility 70%
Process: coarse crushing, in small, broken bits, abrasive dust, oven dry are with embodiment 1, and oven dry back breeze enters I level magnetic separator;
The magnetic separation of I level:
Equipment: with embodiment 1:
Magnetic field intensity: 800～1000GS
Magnetic drum rotating speed: 150 rev/mins
The magnetic separation of II level:
Equipment: with embodiment 1:
Magnetic field intensity: 800～1000GS
Magnetic drum rotating speed: 250 rev/mins
The magnetic separation of III level:
Equipment: with embodiment 1:
Magnetic field intensity: 600～800GS
Magnetic drum rotating speed: 300 rev/mins
The preparation of iron powder slurry, desliming, wet feed magnetic separation, dehydration are with embodiment 1;
The technical indicator of finished iron fine ore:
Fe：68.58％；Si：2.8％；S：0.04％；P：0.03％
Embodiment 3:
Ore source: the difficult ore dressing in Lanxian County, Luliang Prefecture, Shanxi
Technical indicator: Fe 38% Si 25% S 0.42% magnetic susceptibility 50%
Process: coarse crushing, in small, broken bits, abrasive dust, with embodiment 1; Breeze water content＜2% is not dried, and breeze is sent into I level magnetic separator behind the abrasive material;
The magnetic separation of I level:
Equipment: with embodiment 1:
Magnetic field intensity: 1000～1200GS
Magnetic drum rotating speed: 80 rev/mins
The magnetic separation of II level:
Equipment: with embodiment 1:
Magnetic field intensity: 800～1000GS
Magnetic drum rotating speed: 180 rev/mins
The magnetic separation of III level:
Equipment: with embodiment 1:
Magnetic field intensity: 600～800GS
Magnetic drum rotating speed: 220 rev/mins
The preparation of iron powder slurry, desliming, wet feed magnetic separation, dehydration are with embodiment 1;
The technical indicator of finished iron fine ore:
Fe：68.5％；Si：3.2％；S：0.02％；P：0.0025％
Claims (2)
1, a kind of magnetic iron ore that contains is produced fine iron breeze combined mineral dressing technology method, it is characterized in that: its technological process is: ore particle diameter＞50mm, promptly carry out coarse crushing through fragmentation, particle diameter is 30～50mm after the coarse crushing, ore after the coarse crushing enters fine crusher and is crushed to ore particle diameter＜30mm, ore after in small, broken bits enters flour mill and makes 80～140 order breezes, breeze enters I level magnetic separator, the magnetic separator magnetic field intensity is 900～1200GS, the magnetic drum rotating speed is 60～180 rev/mins, iron powder enters II level magnetic separator after the magnetic separation, magnetic field intensity is 700～900GS, the magnetic drum rotating speed is 200～270 rev/mins, iron powder after the magnetic separation enters III level magnetic separator, magnetic field intensity is 400～700GS, 280～320 rev/mins of magnetic drum rotating speeds, iron powder enters iron powder slurry make-up tank after the magnetic separation, iron powder is 1: 1～1.5 with the water quality ratio, under agitation mix, mixing speed is 60～80 rev/mins, the iron powder slurry that stirs enters sloughing-off tank, slag is sedimentation in sloughing-off tank, discharge sloughing-off tank, slag is sent into dewaterer, and the water of deviating from is sent into iron powder slurry make-up tank and recycled, and the iron powder slurry after the desliming is with being pumped into the wet feed magnetic separator, the magnetic separator magnetic field intensity is 900～1250GS, 280～320 rev/mins of magnetic drum rotating speeds, fine iron breeze is sent into dewaterer after the magnetic separation, and dehydration is to moisture 8～10%, make fine iron breeze, the water of deviating from enters the wet feed magnetic separator and recycles.
2, a kind of magnetic iron ore that contains according to claim 1 is produced fine iron breeze combined mineral dressing technology method, it is characterized in that: described technological process, behind abrasive dust, breeze enters dryer, bake out temperature is 100～300 ℃, oven dry back moisture content＜1%, and oven dry back breeze enters I level magnetic separator.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410082955 CN1265890C (en) | 2004-12-14 | 2004-12-14 | Combined mineral separation technology process for producing iron refine ore powder containing magnetic iron ore |
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|---|---|---|---|
| CN 200410082955 CN1265890C (en) | 2004-12-14 | 2004-12-14 | Combined mineral separation technology process for producing iron refine ore powder containing magnetic iron ore |
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| CN1623668A CN1623668A (en) | 2005-06-08 |
| CN1265890C true CN1265890C (en) | 2006-07-26 |
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Families Citing this family (15)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101161351B (en) * | 2007-11-29 | 2011-03-16 | 王少祖 | Ore-sorting system and technique of ferro-sulphur ore powder |
| CN101161349B (en) * | 2007-11-29 | 2011-03-16 | 王少祖 | Ore-sorting system and technique for iron ore powder |
| CN101733195A (en) * | 2008-11-20 | 2010-06-16 | 李家珍 | Combined ore dressing process for iron ore concentrate powder and boron ore concentrate powder produced by magnetic ludwigite |
| CN101559403B (en) * | 2009-05-31 | 2013-03-20 | 安徽大昌矿业集团有限公司 | Method for concentrating extremely low-grade refractory magnetite |
| CN102649101A (en) * | 2011-02-23 | 2012-08-29 | 四川环能德美科技股份有限公司 | Mine magnetic dense medium recycling process |
| CN102240587A (en) * | 2011-05-16 | 2011-11-16 | 成都利君实业股份有限公司 | Wet-type magnetic separation method of magnetite |
| CN103143438A (en) * | 2013-03-05 | 2013-06-12 | 许建民 | Production technique of magnetite refined powdered iron by dry process |
| CN103537371B (en) * | 2013-10-17 | 2016-08-17 | 东莞市众力磁性器件有限公司 | Wet-type magnetic separation method and realize the wet magnetic separator of said method |
| CN104368435A (en) * | 2014-11-04 | 2015-02-25 | 无锡阳工机械制造有限公司 | Method for acquiring finished product iron from iron ore |
| CN104437840A (en) * | 2014-11-04 | 2015-03-25 | 无锡阳工机械制造有限公司 | Method for obtaining finished product of iron from iron ores |
| CN104475249A (en) * | 2014-11-04 | 2015-04-01 | 无锡阳工机械制造有限公司 | Method for screening finished product iron from iron ore |
| CN104368438A (en) * | 2014-11-04 | 2015-02-25 | 无锡阳工机械制造有限公司 | Method of extracting finished iron product from iron ore |
| CN104475241A (en) * | 2014-11-04 | 2015-04-01 | 无锡阳工机械制造有限公司 | Method for extracting finished product iron from iron ore |
| CN104475247A (en) * | 2014-11-04 | 2015-04-01 | 无锡阳工机械制造有限公司 | Method for extracting and transporting finished product iron from iron ore |
| CN106179706B (en) * | 2016-08-04 | 2019-08-23 | 山东济钢合金材料科技有限公司 | A method of separating the iron oxide mixed from iron powder |
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