CN103611623A - Process method for hematite dressing to increase gravity concentrate yield - Google Patents

Process method for hematite dressing to increase gravity concentrate yield Download PDF

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Publication number
CN103611623A
CN103611623A CN201310569240.9A CN201310569240A CN103611623A CN 103611623 A CN103611623 A CN 103611623A CN 201310569240 A CN201310569240 A CN 201310569240A CN 103611623 A CN103611623 A CN 103611623A
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China
Prior art keywords
concentrate
magnetic
magnetic machine
spiral chute
feeds
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Pending
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CN201310569240.9A
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Chinese (zh)
Inventor
李绍春
裴海振
回春
赵亮
周健
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Angang Group Mining Co Ltd
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Angang Group Mining Co Ltd
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Priority to CN201310569240.9A priority Critical patent/CN103611623A/en
Publication of CN103611623A publication Critical patent/CN103611623A/en
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Abstract

The invention relates to a process method for hematite dressing to increase gravity concentrate yield. The process method includes forming primary closed circuit grinding by an original and ball mill and a primary grading hydrocyclone, and feeding overflow of the primary grading hydrocyclone into a secondary grading hydrocyclone for grading. The process method is characterized by further including the following steps: feeding sunk sand of the secondary grading hydrocyclone into a roughing spiral chute and a concentration spiral chute, feeding rough tailings into a second-section weak magnetic machine and a sweeping machine, feeding concentrates of the concentration spiral chute into a high-frequency vibrating mesh screen, and feeding tailings together with concentrates of the second-section weak magnetic machine and the sweeping machine; feeding sunk sand of a tertiary grading hydrocyclone into a secondary ball mill, directly discarding tailings after overflow is screened by a third-section weak magnetic machine and a second-section strong magnetic machine, and feeding concentrates of a first-section weak magnetic machine and a first-section strong magnetic machine together with concentrates of the third-section weak magnetic machine and a second-section strong magnetic machine into a fourth grading hydrocyclone for grading. The process method has the advantages that gravity concentrate yield is increased, flotation processing quantity and flotation concentrate yield are substantially reduced, and dressing efficiency is improved.

Description

A kind of hematite separation increases the process of gravity concentrate output
?
Technical field
The invention belongs to iron ore and sort technical field, particularly a kind of hematite separation increases the process of gravity concentrate output.
background technology:
At present, China's rhombohedral iron ore beneficiation technics adopts stage grinding more, coarse and fine separation, gravity treatment-strong magnetic-anion reverse floatation technique, iron ore concentrate by this explained hereafter is comprised of gravity concentrate and flotation concentrate two parts, under the normal condition of production, Floatation Concentrate Grade is more higher than gravity concentrate grade, for comprehensive iron ore concentrate TFe grade is reached more than 67.5%, flotation concentrate and gravity concentrate institute accounting are generally 5:5 or 6:4, so adopt the ore deposit that flotation is processed, measure the ore deposit amount that is also greater than re-selection process, because gravity treatment internal circulating load is large and secondary grinding poor effect, cause thickness grading cyclone mine-supplying quantity, feed ore concentration also increases thereupon, thickness grading cyclone classification poor effect, in overflow (flotation is to ore deposit), also have the monomer of 10% left and right not dissociate, after flotation, there is the on the low side and flotation tailing TFe grade higher (20% left and right) of flotation concentrate TFe grade, be far longer than and sweep middle magnetic tail ore deposit TFe grade (below 9%) and strong magnetic tailings grade (below 9.5%), have influence on the raising of metal recovery rate.
For increasing gravity concentrate proportion, reduce flotation concentrate proportion, reduce production costs, the process overcoming the above problems both at home and abroad at present mainly contains two classes, and the one, cancel fine particles flotation technique, adopt centrifugal ore separator to sort particulate iron mineral, or other gravity separation technology, and obtaining final concentrate, the major defect of the method is that comprehensive concentrate TFe grade is not high, can not meet the index request of pelletizing production to iron material, tailings grade is also higher simultaneously; The 2nd, at the mixing magnetic concentrate to before flotation, to carry out gravity treatment and increase gravity concentrate output, the shortcoming of the method is to solve the problem that gravity treatment internal circulating load is large, can not solve further raising flotation to the problem of ore deposit liberation degree of minerals simultaneously.
For improving flotation liberation degree of minerals, there is at present the strong magnetic of employing to throw in advance tail, after magnetic fine grinding, directly carry out reverse flotation, it is higher that shortcoming is that magnetic-floating is reelected cost.
Summary of the invention
The object of this invention is to provide a kind of hematite separation increases the process of gravity concentrate, this process increases gravity concentrate proportion in comprehensive concentrate, reduce flotation mine-supplying quantity simultaneously and improve flotation to ore deposit liberation degree of minerals, can also dish out in time coarse grain, fine tailings, reduce systemic circulation amount, improve beneficiating efficiency, reach energy-conservation, consumption reduction, improve the object of metal recovery rate.
The object of the present invention is achieved like this.
According to hematite separation of the present invention, increase the process of gravity concentrate output, the ore that to comprise bloodstone TFe grade be 20~30% obtains the raw ore of 0~12mm after fragmentation, feed the closed circuit grinding that ball mill and scalping cyclone form, the flood pump of scalping cyclone is given into secondary grading cyclone classification and is become overflow and two kinds of materials of sand setting thickness, the sand setting of secondary grading cyclone classification feeds roughly selects spiral chute, the concentrate of roughly selecting spiral chute feeds selected spiral chute, magnetic machine and sweep middle magnetic a little less than the tailings pump of roughly selecting spiral chute is given two sections, through magnetic machine a little less than in the of two sections with after sweeping middle magnetic separation not other, abandon the coarse grain mine tailing of TFe grade below 9.0%, the concentrate of selected spiral chute feeds high frequency vibrating screen, the undersize of its high frequency vibrating screen is more than 67% qualified concentrate containing of TFe grade, and a little less than the oversize of high frequency vibrating screen, selected spiral chute mine tailing and two sections, magnetic pumping together with sweeping the concentrate of middle magnetic feeds classifying cyclone three times,
Characterized by further comprising the following step:
A) magnetic machine and one section strong magnetic machine a little less than the overflow product that the concentration of secondary grading cyclone is 25%~35% feeds one section are directly abandoned the fine tailings of TFe grade below 9.5% after magnetic machine a little less than in the of a section and one section strong magnetic machine sort;
B) sand setting of three classifying cyclones feeds secondary ball mill and carries out secondary grinding, secondary grinding is open-circuit grinding, concentration after secondary grinding is 60%~70%, it is 45~50% that the product that-200 order granularity content are 50-65% returns with concentration, the overflow of the scalping cyclone that-200 order granularity content are 50-55% feeds the operation of secondary grading cyclone together
The overflow of three classifying cyclones, after magnetic machine a little less than in the of three sections and two sections strong magnetic machines sort, is directly abandoned the fine tailings of TFe grade below 9.5%,
C) together with the concentrate of magnetic machine concentrate a little less than the concentrate of magnetic machine concentrate a little less than a section and one section of strong magnetic machine, three sections and two sections of strong magnetic machines, feed classifying cyclone four times, the overflow of its four classifying cyclones after concentrated directly as flotation to ore deposit, the sand setting of four classifying cyclones returns together with roughly selecting the concentrate of spiral chute and feeds selected spiral chute operation; Described sweep middle magnetic tail ore deposit, one section strong magnetic tail ore deposit and two sections strong magnetic tail ore deposits all feed mine tailing pumping plant.
Compared with prior art, the invention has the beneficial effects as follows:
Increase gravity concentrate output, significantly reduce flotation treating capacity and flotation concentrate output, final realization reduced floating agent consumption, alleviate the pollution of floating agent to environment, improve flotation feed preparation unit size and form, dish out in time coarse grain, fine tailings, reduce systemic circulation amount, improve beneficiating efficiency, there is effect energy-conservation, that lower consumption, improve metal recovery rate.
Accompanying drawing explanation
Fig. 1 is the process method flow chart that rhombohedral iron ore beneficiation technics of the present invention increases gravity concentrate output.
The specific embodiment
Below in conjunction with accompanying drawing, the invention will be further described.
As shown in Figure 1, hematite separation of the present invention increases the process of gravity concentrate output, the ore that to comprise bloodstone TFe grade be 20~30% obtains the raw ore of 0~12mm after fragmentation, feed the closed circuit grinding that ball mill and scalping cyclone form, the flood pump of scalping cyclone is given into secondary grading cyclone classification and is become overflow and two kinds of materials of sand setting thickness, the sand setting of secondary grading cyclone classification feeds roughly selects spiral chute, the concentrate of roughly selecting spiral chute feeds selected spiral chute, magnetic machine and sweep middle magnetic a little less than the tailings pump of roughly selecting spiral chute is given two sections, through magnetic machine a little less than in the of two sections with after sweeping middle magnetic separation not other, abandon the coarse grain mine tailing of TFe grade below 9.0%, the concentrate of selected spiral chute feeds high frequency vibrating screen, the undersize of its high frequency vibrating screen is more than 67% qualified concentrate containing of TFe grade, and a little less than the oversize of high frequency vibrating screen, selected spiral chute mine tailing and two sections, magnetic pumping together with sweeping the concentrate of middle magnetic feeds classifying cyclone three times,
Characterized by further comprising the following step:
A) magnetic machine and one section strong magnetic machine a little less than the overflow product that the concentration of secondary grading cyclone is 25%~35% feeds one section are directly abandoned the fine tailings of TFe grade below 9.5% after magnetic machine a little less than in the of a section and one section strong magnetic machine sort;
B) sand setting of three classifying cyclones feeds secondary ball mill and carries out secondary grinding, secondary grinding is open-circuit grinding, concentration after secondary grinding is 60%~70%, it is 45~50% that the product that-200 order granularity content are 50-65% returns with concentration, the overflow of the scalping cyclone that-200 order granularity content are 50-55% feeds the operation of secondary grading cyclone together
The overflow of three classifying cyclones, after magnetic machine a little less than in the of three sections and two sections strong magnetic machines sort, is directly abandoned the fine tailings of TFe grade below 9.5%,
C) together with the concentrate of magnetic machine concentrate a little less than the concentrate of magnetic machine concentrate a little less than a section and one section of strong magnetic machine, three sections and two sections of strong magnetic machines, feed classifying cyclone four times, the overflow of its four classifying cyclones after concentrated directly as flotation to ore deposit, the sand setting of four classifying cyclones returns together with roughly selecting the concentrate of spiral chute and feeds selected spiral chute operation; Described sweep middle magnetic tail ore deposit, one section strong magnetic tail ore deposit and two sections strong magnetic tail ore deposits all feed mine tailing pumping plant.
Because having adopted the strong magnetic of segmentation, the present invention throws tail, not only at gravity treatment stage dish out in advance coarse grain, fine tailings, significantly reduce flotation treating capacity, but also cancelled one section of concentrator enrichment process in original technique, reduce systemic circulation amount, improve beneficiating efficiency, there is effect energy-conservation, that lower consumption, improve metal recovery rate.

Claims (1)

1. a hematite separation increases the process of gravity concentrate output, the ore that to comprise bloodstone TFe grade be 20~30% obtains the raw ore of 0~12mm after fragmentation, feed the closed circuit grinding that ball mill and scalping cyclone form, the flood pump of scalping cyclone is given into secondary grading cyclone classification and is become overflow and two kinds of materials of sand setting thickness, the sand setting of secondary grading cyclone classification feeds roughly selects spiral chute, the concentrate of roughly selecting spiral chute feeds selected spiral chute, magnetic machine and sweep middle magnetic a little less than the tailings pump of roughly selecting spiral chute is given two sections, through magnetic machine a little less than in the of two sections with after sweeping middle magnetic separation not other, abandon the coarse grain mine tailing of TFe grade below 9.0%, the concentrate of selected spiral chute feeds high frequency vibrating screen, the undersize of its high frequency vibrating screen is more than 67% qualified concentrate containing of TFe grade, and a little less than the oversize of high frequency vibrating screen, selected spiral chute mine tailing and two sections, magnetic pumping together with sweeping the concentrate of middle magnetic feeds classifying cyclone three times,
Characterized by further comprising the following step:
A) magnetic machine and one section strong magnetic machine a little less than the overflow product that the concentration of secondary grading cyclone is 25%~35% feeds one section are directly abandoned the fine tailings of TFe grade below 9.5% after magnetic machine a little less than in the of a section and one section strong magnetic machine sort;
B) sand setting of three classifying cyclones feeds secondary ball mill and carries out secondary grinding, secondary grinding is open-circuit grinding, concentration after secondary grinding is 60%~70%, it is 45~50% that the product that-200 order granularity content are 50-65% returns with concentration, the overflow of the scalping cyclone that-200 order granularity content are 50-55% feeds the operation of secondary grading cyclone together
The overflow of three classifying cyclones, after magnetic machine a little less than in the of three sections and two sections strong magnetic machines sort, is directly abandoned the fine tailings of TFe grade below 9.5%,
C) together with the concentrate of magnetic machine concentrate a little less than the concentrate of magnetic machine concentrate a little less than a section and one section of strong magnetic machine, three sections and two sections of strong magnetic machines, feed classifying cyclone four times, the overflow of its four classifying cyclones after concentrated directly as flotation to ore deposit, the sand setting of four classifying cyclones returns together with roughly selecting the concentrate of spiral chute and feeds selected spiral chute operation; Described sweep middle magnetic tail ore deposit, one section strong magnetic tail ore deposit and two sections strong magnetic tail ore deposits all feed mine tailing pumping plant.
CN201310569240.9A 2013-11-13 2013-11-13 Process method for hematite dressing to increase gravity concentrate yield Pending CN103611623A (en)

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Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104148165A (en) * 2014-07-28 2014-11-19 鞍钢集团矿业公司 Process for separate grinding and centrifugal recycling of hematite tailings
CN104174482A (en) * 2014-09-03 2014-12-03 鞍钢集团矿业公司 Mineral processing technology for low grade hematite ore
CN104437827A (en) * 2014-09-15 2015-03-25 中冶北方(大连)工程技术有限公司 Specularite dust ore dressing technology
CN104888939A (en) * 2015-06-12 2015-09-09 鞍钢集团矿业公司 Magnetic separation and gravity separation pre-concentration and rough concentrate regrinding and re-concentration hematite tailing recovery process
CN104923386A (en) * 2015-06-12 2015-09-23 鞍钢集团矿业公司 Micro-fine disseminated mixed ore coarse size preconcentrating and magnetic-gravitational separating process
CN105944825A (en) * 2016-05-24 2016-09-21 昆明理工大学 Beneficiation desilication enrichment method for fine-particle hematite
CN106311453A (en) * 2016-08-30 2017-01-11 襄阳泽东化工集团有限公司 Device for closed cycle phosphorite wet ball grinding and ball grinding method
CN108212505A (en) * 2017-12-22 2018-06-29 安徽开发矿业有限公司 The ore-dressing plant and method of secondary grinding classification sand setting are sorted using spiral chute
CN108970802A (en) * 2018-09-20 2018-12-11 鞍钢集团矿业有限公司 A kind of floating combined mineral dressing technology of the stage grinding-magnetic-weight-sorting hematite
CN111545339A (en) * 2020-05-13 2020-08-18 江西理工大学 Device and method for separating and recovering chromium from laterite-nickel ore

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CN102824956A (en) * 2012-09-21 2012-12-19 鞍钢集团矿业公司 Poor hematite grading level and narrow level sorting process
CN102921540A (en) * 2012-11-16 2013-02-13 鞍钢集团矿业公司 Lean hematite processing technology

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Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104148165A (en) * 2014-07-28 2014-11-19 鞍钢集团矿业公司 Process for separate grinding and centrifugal recycling of hematite tailings
CN104174482B (en) * 2014-09-03 2016-09-14 鞍钢集团矿业公司 A kind of lean hematite ore-dressing technique
CN104174482A (en) * 2014-09-03 2014-12-03 鞍钢集团矿业公司 Mineral processing technology for low grade hematite ore
CN104437827A (en) * 2014-09-15 2015-03-25 中冶北方(大连)工程技术有限公司 Specularite dust ore dressing technology
CN104437827B (en) * 2014-09-15 2017-02-15 中冶北方(大连)工程技术有限公司 Specularite dust ore dressing technology
CN104888939A (en) * 2015-06-12 2015-09-09 鞍钢集团矿业公司 Magnetic separation and gravity separation pre-concentration and rough concentrate regrinding and re-concentration hematite tailing recovery process
CN104923386A (en) * 2015-06-12 2015-09-23 鞍钢集团矿业公司 Micro-fine disseminated mixed ore coarse size preconcentrating and magnetic-gravitational separating process
CN104888939B (en) * 2015-06-12 2017-10-13 鞍钢集团矿业有限公司 Magnetic is preselected again, coarse concentrate regrinding selects bloodstone tailings recovery process again
CN105944825B (en) * 2016-05-24 2018-07-24 昆明理工大学 A kind of ore dressing and desiliconizing enrichment method of Fine Hematite Ore
CN105944825A (en) * 2016-05-24 2016-09-21 昆明理工大学 Beneficiation desilication enrichment method for fine-particle hematite
CN106311453A (en) * 2016-08-30 2017-01-11 襄阳泽东化工集团有限公司 Device for closed cycle phosphorite wet ball grinding and ball grinding method
CN108212505A (en) * 2017-12-22 2018-06-29 安徽开发矿业有限公司 The ore-dressing plant and method of secondary grinding classification sand setting are sorted using spiral chute
CN108970802A (en) * 2018-09-20 2018-12-11 鞍钢集团矿业有限公司 A kind of floating combined mineral dressing technology of the stage grinding-magnetic-weight-sorting hematite
CN108970802B (en) * 2018-09-20 2020-07-28 鞍钢集团矿业有限公司 Stage grinding-magnetic-gravity-floating combined mineral separation process for separating hematite
CN111545339A (en) * 2020-05-13 2020-08-18 江西理工大学 Device and method for separating and recovering chromium from laterite-nickel ore

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Application publication date: 20140305