CN103272680A - Gravity regrinding technology capable of improving balling performance of hematite ore concentrates - Google Patents
Gravity regrinding technology capable of improving balling performance of hematite ore concentrates Download PDFInfo
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- CN103272680A CN103272680A CN2013102314329A CN201310231432A CN103272680A CN 103272680 A CN103272680 A CN 103272680A CN 2013102314329 A CN2013102314329 A CN 2013102314329A CN 201310231432 A CN201310231432 A CN 201310231432A CN 103272680 A CN103272680 A CN 103272680A
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Abstract
The invention relates to a gravity regrinding technology capable of improving balling performance of hematite ore concentrates. After combined beneficiation operation selection including stage grinding, thickness grading and gravity-magnetic separation-anion reverse flotation, two mixed hematite ore concentrates including a gravity concentrate and a flotation concentrate are sorted out, and the gravity regrinding technology is characterized by comprising the steps as follows: 1), the gravity concentrate is introduced into grading equipment for grading operation; 2), coarse-grain products subjected to the grading operation enter a ball grinding mill for secondary ore grinding, and the products after the ore grinding return the grading equipment to form closed loop; and 3), fine-grain products subjected to the grading operation is mixed with the flotation concentrate and is introduced to a thickener for concentration, overflow of the thickener serves as circulated water for recycle, underflow of the thickener is introduced to a filter for dehydration, and the moisture is controlled below 9.5%. The gravity regrinding technology has the advantages that content of micro-fine grains in the mixed hematite ore concentrates is improved effectively, the specific surface areas of the hematite ore concentrates are increased, and the usage of the hematite ore concentrates is further improved to higher than 60% from lower than 50% originally.
Description
Technical field
The present invention belongs to the technique of preparing field, relates in particular to a kind of gravity treatment regrinding process that improves red iron ore concentrate balling property.
Background technology
At present in the lean hematite ore dressing field, nearly all adopt stage grinding, thickness grading, gravity treatment-magnetic separation-anion reverse floatation process integration to handle lean hematite, adopt the red iron ore concentrate of this explained hereafter usually as the pelletizing production raw material, because the red iron ore concentrate of this explained hereafter is made up of two parts, a part is gravity concentrate, account for about 40 ~ 50% of concentrate total amount,-0.074mm granularity content accounts for 70 ~ 80%, micro-size fraction content 0.045mm is less than 50%, particle shows more smooth, corner angle are less, and balling property is relatively poor; Another part be flotation concentrate account for total amount about 50 ~ 60%,-0.074mm granularity content accounts for 85 ~ 95%, micro-size fraction content 0.045mm is greater than 70%, epigranular, balling property is better, integrate and see, micro-size fraction 0.045mm content still is on the low side in the mixed red iron ore concentrate of these two parts, therefore as behind the pelletizing production raw material, its balling-up physical property is undesirable, for physical and chemical indexes and the hot index of guaranteeing pellet reaches the iron-smelting raw material standard, prolongs the ring formation of rotary kiln time simultaneously, reduce content of binder, generally in pelletizing production, red iron ore concentrate proportioning is controlled below 50%.For the resourceful bargh of lean hematite, be comprehensive utilization bloodstone resource, it is imperative further to improve red iron ore concentrate proportioning in the pellet raw material.
For further improving the balling property of red iron ore concentrate, the one, adopt damp mill or high-pressure roller mill that the compounds of making before the ball such as red iron ore concentrate are carried out preliminary treatment, increase the micro-size fraction content in the compounds such as red iron ore concentrate, the deficiency that this method exists is that the damp mill disposal ability is low, energy consumption and steel consumption are high, and the power consumption of high-pressure roller mill is also higher, has also increased the upside-down mounting cost of transportation in addition.The 2nd, to adopt and improve the binding agent proportioning, break-in improves the balling property of red iron ore concentrate, and the deficiency of this method is to have reduced pellet iron grade, and the production cost that causes smelting iron increases.The 3rd, rhombohedral iron ore beneficiation technics is undergone technological transformation, directly produce the red iron ore concentrate that physical property is fit to pelletizing production.
Summary of the invention
It is simple to the purpose of this invention is to provide a kind of technology, can increase red iron ore concentrate and make the gravity treatment regrinding process that improves red iron ore concentrate balling property of the proportional quantity in the ball at pelletizing.
The present invention realizes by following technical proposals.
The gravity treatment regrinding process that improves red iron ore concentrate balling property of the present invention, comprise stage grinding, thickness grading, after gravity treatment-magnetic separation-operation of anion reverse floatation beneficiation combined method sorts, selecting the TFe grade respectively is 67～67.5%, account for 40～50% of concentrate total amount, it is 67.5～68% that-0.074mm granularity content accounts for 70～80% gravity concentrate and TFe grade, account for 50～60% of concentrate total amount,-0.074mm granularity content accounts for two kinds of 85～95% flotation concentrate and mixes red iron ore concentrates, it is characterized in that comprising the steps:
1) be 67～68% with the TFe grade, account for 40～50% of concentrate total amount ,-0.074mm granularity content accounts for 70～80% gravity concentrate and feeds classifying equipoment and carry out graded operation,
2) behind the smart classified sizing of equipment of its gravity treatment, graded operation coarse grain product enters ball mill and carries out ore grinding again, and the product behind the ore grinding returns above-mentioned graded operation and forms closed cycle,
3) the particulate product of graded operation and TFe grade are 67.5～68%, account for 50～60% of concentrate total amount,-0.074mm granularity content accounts for the concentrator that feeds before filtering after 85～95% flotation concentrate mixes and concentrates, its concentrator overflow is as ring water recycling, thickener underflow concentration is 50～60%,-0.074mm granularity content feeds filter greater than the red iron ore concentrate of 90% mixing and dewaters, and finally mixes the moisture control of red iron ore concentrate below 9.5%.
Described classifying equipoment is high frequency vibrating screen or hydrocyclone.
Described high frequency vibrating screen screen size is 1.0～0.7mm.
Advantage of the present invention is:
Because the present invention has adopted the gravity concentrate regrinding process, microfine content-0.045mm can be from bringing up to below 20% more than 60% in the gravity concentrate, mix in the red iron ore concentrate micro-size fraction content-0.045mm from bringing up to below 50% more than 65% thereby make, effectively increase the specific area of red iron ore concentrate, the balling-up of red iron ore concentrate is corresponding raising also, do not increase binding agent consumption and stable pelletizing production situation under, can further improve more than the consumption to 60% of red iron ore concentrate, and prolong the ring formation of rotary kiln time.
Description of drawings
Fig. 1 is the gravity treatment regrinding process flow chart that improves red iron ore concentrate balling property of the present invention.
Fig. 2 is the schematic diagram of another embodiment of the present invention.
The specific embodiment
The invention will be further described below in conjunction with accompanying drawing.
As shown in Figure 1, according to the gravity treatment regrinding process that improves red iron ore concentrate micro-size fraction content of the present invention, comprise stage grinding, thickness grading, after gravity treatment-magnetic separation-operation of anion reverse floatation beneficiation combined method sorts, selecting the TFe grade respectively is 67～67.5%, account for 40～50% of concentrate total amount, it is 67.5～68% that-0.074mm granularity content accounts for 70～80% gravity concentrate and TFe grade, account for 50～60% of concentrate total amount,-0.074mm granularity content accounts for two kinds of 85～95% flotation concentrate and mixes red iron ore concentrates, it is characterized in that comprising the steps:
1) be 67～67.5% with the TFe grade, account for 40～50% of concentrate total amount ,-0.074mm granularity content accounts for 70～80% gravity concentrate and feeds classifying equipoment and carry out graded operation,
2) behind the smart classified sizing of equipment of its gravity treatment, graded operation coarse grain product enters ball mill and carries out ore grinding again, and the product behind the ore grinding returns above-mentioned graded operation and forms closed cycle,
3) the particulate product of graded operation and TFe grade are 67.5～68%, account for 50～60% of concentrate total amount,-0.074mm granularity content accounts for the concentrator that feeds before filtering after 85～95% flotation concentrate mixes and concentrates, its concentrator overflow is as ring water recycling, thickener underflow concentration is 50～60%,-0.074mm granularity content feeds filter greater than the red iron ore concentrate of 90% mixing and dewaters, and finally mixes the moisture control of red iron ore concentrate below 9.5%.
Classifying equipoment of the present invention is high frequency vibrating screen or hydrocyclone.
Fig. 2 illustrates the schematic diagram that classifying equipoment is selected the embodiment of high frequency vibrating screen for use,
1) be 67～68% with the TFe grade, account for 40～50% of concentrate total amount ,-0.074mm granularity content accounts for 70～80% gravity concentrate and feeds high frequency vibrating screen and carry out graded operation,
2) its gravity treatment essence is after the high frequency vibrating screen classification, and the coarse grain product enters ball mill and carries out ore grinding again on the sieve, and the product behind the ore grinding returns above-mentioned graded operation and forms closed cycle,
3) particulate product and the TFe grade under the high frequency vibrating screen sieve is 67.5～68%, account for 50～60% of concentrate total amount,-0.074mm granularity content accounts for the concentrator that feeds before filtering after 85～95% flotation concentrate mixes and concentrates, its concentrator overflow is as ring water recycling, thickener underflow concentration is 50～60%,-0.074mm granularity content feeds filter greater than the red iron ore concentrate of 90% mixing and dewaters, and finally mixes the moisture control of red iron ore concentrate below 9.5%.
Described high frequency vibrating screen screen size is 1.0～0.7mm.This screen size can be guaranteed the size indicator of undersize.
The balling-up of adopting sorting process of the present invention to improve red iron ore concentrate can stablized further red iron ore concentrate proportioning, prolongation ring formation of rotary kiln time, minimizing content of binder, the raising pellet grade of improving under the prerequisite of pelletizing production.
Claims (3)
1. gravity treatment regrinding process that can improve red iron ore concentrate balling property, comprise stage grinding, thickness grading, after gravity treatment-magnetic separation-operation of anion reverse floatation beneficiation combined method sorts, selecting the TFe grade respectively is 67～67.5%, account for 40～50% of concentrate total amount, it is 67.5～68% that-0.074mm granularity content accounts for 70～80% gravity concentrate and TFe grade, account for 50～60% of concentrate total amount,-0.074mm granularity content accounts for two kinds of 85～95% flotation concentrate and mixes red iron ore concentrates, it is characterized in that comprising the steps:
1) be 67～67.5% with the TFe grade, account for 40～50% of concentrate total amount ,-0.074mm granularity content accounts for 70～80% gravity concentrate and feeds classifying equipoment and carry out graded operation,
2) behind the smart classified sizing of equipment of its gravity treatment, graded operation coarse grain product enters ball mill and carries out ore grinding again, and the product behind the ore grinding returns above-mentioned graded operation and forms closed cycle,
3) the particulate product of graded operation and TFe grade are 67.5～68%, account for 50～60% of concentrate total amount,-0.074mm granularity content accounts for the concentrator that feeds before filtering after 85～95% flotation concentrate mixes and concentrates, its concentrator overflow is as ring water recycling, thickener underflow concentration is 50～60%,-0.074mm granularity content feeds filter greater than the red iron ore concentrate of 90% mixing and dewaters, and finally mixes the moisture control of red iron ore concentrate below 9.5%.
2. a kind of gravity treatment regrinding process that improves red iron ore concentrate balling property according to claim 1 is characterized in that described classifying equipoment is high frequency vibrating screen or hydrocyclone.
3. a kind of gravity treatment regrinding process that improves red iron ore concentrate balling property according to claim 2 is characterized in that described high frequency vibrating screen screen size is 1.0～0.7mm.
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103447147A (en) * | 2013-09-05 | 2013-12-18 | 鞍钢集团矿业公司 | Novel low grade hematite ore concentration and water purification process |
| CN104226464A (en) * | 2014-08-26 | 2014-12-24 | 鄯善县通宝矿业有限公司 | Comprehensive utilization method of metal tailing sand |
| CN105233971A (en) * | 2015-11-02 | 2016-01-13 | 迈安德集团有限公司 | Baffle-plate overflowing ore pulp grading system and ore pulp grading process |
| CN106345605A (en) * | 2016-11-27 | 2017-01-25 | 玉溪大红山矿业有限公司 | Quality improvement and silicon reduction technology for superfine silicate type low-grade hard-dressing hematite roughing concentrate |
| CN106890719A (en) * | 2017-02-18 | 2017-06-27 | 陈建龙 | A kind of grinding system and its method |
| CN110004289A (en) * | 2019-04-03 | 2019-07-12 | 宝钢湛江钢铁有限公司 | A kind of method that high mixture ratio sintering card powder is used for fluxed pellets production |
| CN112916197A (en) * | 2021-01-28 | 2021-06-08 | 内蒙古金陶股份有限公司 | Pretreatment method before ore processing |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103447147A (en) * | 2013-09-05 | 2013-12-18 | 鞍钢集团矿业公司 | Novel low grade hematite ore concentration and water purification process |
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| CN104226464A (en) * | 2014-08-26 | 2014-12-24 | 鄯善县通宝矿业有限公司 | Comprehensive utilization method of metal tailing sand |
| CN105233971A (en) * | 2015-11-02 | 2016-01-13 | 迈安德集团有限公司 | Baffle-plate overflowing ore pulp grading system and ore pulp grading process |
| CN106345605A (en) * | 2016-11-27 | 2017-01-25 | 玉溪大红山矿业有限公司 | Quality improvement and silicon reduction technology for superfine silicate type low-grade hard-dressing hematite roughing concentrate |
| CN106345605B (en) * | 2016-11-27 | 2019-10-18 | 玉溪大红山矿业有限公司 | A kind of low-grade difficulty of fine silicate-type selects red iron rougher concentration upgrading drop silicon technology |
| CN106890719A (en) * | 2017-02-18 | 2017-06-27 | 陈建龙 | A kind of grinding system and its method |
| CN106890719B (en) * | 2017-02-18 | 2020-05-19 | 陈建龙 | Ore grinding system and method thereof |
| CN110004289A (en) * | 2019-04-03 | 2019-07-12 | 宝钢湛江钢铁有限公司 | A kind of method that high mixture ratio sintering card powder is used for fluxed pellets production |
| CN110004289B (en) * | 2019-04-03 | 2021-04-16 | 宝钢湛江钢铁有限公司 | Method for producing fluxed pellets by using high-proportion sintering card powder |
| CN112916197A (en) * | 2021-01-28 | 2021-06-08 | 内蒙古金陶股份有限公司 | Pretreatment method before ore processing |
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Address after: 114001 Anshan District, Liaoning, No. 219 Road, No. 39, Tiedong Patentee after: Anshan Iron and Steel Group Mining Co., Ltd. Address before: 114001 Anshan District, Liaoning, No. 219 Road, No. 39, Tiedong Patentee before: Angang Group Mine Company |