CN108580022B - Mineral processing technology for producing chemical-grade chromite concentrate - Google Patents
Mineral processing technology for producing chemical-grade chromite concentrate Download PDFInfo
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- CN108580022B CN108580022B CN201810228535.2A CN201810228535A CN108580022B CN 108580022 B CN108580022 B CN 108580022B CN 201810228535 A CN201810228535 A CN 201810228535A CN 108580022 B CN108580022 B CN 108580022B
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- ore
- concentrate
- strong magnetic
- chromite
- mineral
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03B—SEPARATING SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS
- B03B7/00—Combinations of wet processes or apparatus with other processes or apparatus, e.g. for dressing ores or garbage
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03B—SEPARATING SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS
- B03B9/00—General arrangement of separating plant, e.g. flow sheets
Abstract
The invention discloses a mineral processing technology for producing chemical-grade chromite concentrate, which realizes the sorting of high-grade chromite by combining a magnetic-gravity combined technology with a step grinding and step selection method, and mainly comprises the following steps: a. coarse grinding the raw ore by a rod mill, and then performing strong magnetic tailing discarding; b. concentrating the strong magnetic rough concentrate pulp to 50-60% by mass; c. carrying out strong magnetic concentration twice after the concentrated ore pulp is finely ground by an pizza grinder; d. carrying out multiple sorting on the strong magnetic concentrate and the middling by using a tin cloud shaking table respectively to obtain a final product; the invention can not only obtain Cr2O3The content is more than or equal to 60 percent and the impurity SiO2The content of the chromite concentrate is less than or equal to 1.5 percent, the high-quality chromite concentrate which can meet the requirement of producing chromium compounds in high-end chemical industry can be produced, the recovery rate of the chromite is ensured, the process flow is simple, the production cost is low, no chemical flotation agent is required to be added, the environmental pollution is less, the economic benefit and the social benefit are higher, and the method is worthy of popularization and application.
Description
Technical field
The invention belongs to technical field of beneficiation, and in particular to a kind of ore-dressing technique of output chemical industry grade chromite concentrate, it is special
It is not suitable for Cr in chromite ore2O3The ore dressing of the high-grade chromite ore of content >=30% is recycled.
Background technique
Chromium is one of modern industry important meals, and purposes is extremely wide, be mainly used for metallurgy, refractory material and
Chemical industrial field etc..In metallurgical industry, chromite is mainly used to produce ferrochrome and crome metal；On refractory material,
Chromite is used to manufacture chrome brick, chromium and magnesium brick and other special refractories；Chromite is mainly used to production weight on chemical industry
Sodium chromate, and then produce other chromium compounds.
Currently, mainly using single gravity concentration, single magnetic separation, or again-magnetic joint to the ore-dressing technique of chrome ore at present both at home and abroad
Ore dressing etc., these methods are only capable of output chromite concentrate used for refractory material and metallurgical chromite concentrate, and rarely have technique
The chromite concentrate of the energy high-end chemical grade of output.As Chinese invention patent CN103878111A and CN103894287A are disclosed respectively
The beneficiation new process of high-grade chromite ore a kind of and a kind of beneficiation method for recycling chrome ore lump ore, obtained ferrochrome
Cr in mine concentrate2O3Content 40% or so, is simply possible to use in refractory material；" mineral products comprehensive utilization " deliver " from low-grade chromium
The ore-dressing technique research of chromite is recycled in ore " in paper then to single gravity concentration, again-magnetic combined mineral dressing technology carried out pair
Than, weight-magnetic combined effect it is obvious that its strong magnetic-tabling process flow effect of strong magnetic-shaking table-middling ore regrinding-for using most
It is good, but because the technological parameter of ore grinding is identical twice, the influence to iron ore granularity is little, not can be effectively controlled ore grain size and
The degree of cooperation of magnetic separator causes magnetic separation ineffective, therefore the content of chromite can only be made to reach 40% or more.
In order to reach preferable aeneficiation effect, the ore-dressing technique for mostly using chemical flotation and magnetic separation to combine, such as China are specially
Magnetic separation is used in sharp CN103567055A first, qualified ore screening is come out, floatation process is then utilized, to tailing
It carries out one and recycles the process selected again；A kind of beneficiation method is disclosed in 102896049 B of CN, first passes around ore grinding, using floating
It selects medicament to carry out flotation to ore pulp, respectively obtains concentrate and tailings, then magnetic separation recovery is carried out to the iron ore in tailing, obtain final
Ore dressing result.Beneficiation combined method has more mature mineral processing circuit, may select a variety of concentrate, aeneficiation effect is preferable；
But whole process processing step is more, cumbersome, and because the addition of flotation reagent leads to discharge of wastewater, in order to simplify ore dressing
Technique and reduction pollution discharge of wastewater, taking efficient single one physical ore-dressing technique is the target of the following ore-dressing technique.
Since the physical properties difference such as chromite and gangue mineral serpentine, talcum is big, test is proved, using conventional mill
When mine equipment is milled to chromite monomer dissociation, be easy to cause the overground of gangue mineral, to form a large amount of sludges, interfere magnetic separation and
The separating effect of shaking table causes the content of final Chromium in Ores iron ore not high.Therefore, how to be controlled during ore grinding and magnetic separation
The partial size of ore processed and the magnetism intensity of magnetic separation, to realize that the recycling of high-grade chromite is that the present invention is urgently to be resolved and asks
Topic.
Summary of the invention
In order to effectively improve the ore dressing grade of chromite, the production cost of high-end chemical industry grade chromite is reduced, the present invention mentions
A kind of beneficiation method that rank choosing is ground by rank has been supplied, it is high-end in conjunction with high gradient magnetic separator and the cloud tin shaking table of screening fine sand, output
The technique of chemical industry grade chromite, includes the following steps:
A. raw ore carries out strong magnetic and throws tail after rod mill is roughly ground；
B. strong magnetic throws the rough concentrate ore pulp mass fraction obtained after tail and sizes mixing to 50%~60%；
C. the ore pulp after sizing mixing is ended after the fine grinding of Sa grinding machine, and strong magnetic is selected twice for progress, obtains concentrate and chats；
D. high intensity magnetic mineral and chats, which are respectively adopted after shaking table is repeatedly sorted, obtains final products concentrate and tailings.
Preferably, using rod mill when ore is roughly ground, in the ore pulp after ore grinding, the granularity of mineral is -0.074mm,
Mass fraction is 55%~70%.
Preferably, equipment used in high intensity magnetic separation is high gradient magnetic separator, in order to guarantee magnetic separation effect, leakage is avoided to select, selection
Magnetic separator stroke is 16mm~26mm, and jig frequency is 200 beats/min~300 beats/min.
Preferably, in order to reduce the loss of magnetic iron ore, magnetic field strength when strong magnetic throws tail is 1.1T~1.4T, is easy to magnetic
The weaker trommel of property is selected.
Preferably, the lesser ore pulp of partial size in order to obtain, using Chinese mugwort Sa grinding machine, ore grinding when ore fine grinding in step c
In ore pulp afterwards, the granularity of mineral is -0.045mm, and mass fraction is 75%~85%, and wherein 0.025-0.045mm accounts for ore pulp
The 80% of total amount.
Preferably, the selected number of strong magnetic is recleaning, wherein for the first time selected magnetic field strength be 1.1T~
1.4T, second of selected magnetic field strength is 0.8T~1.1T, can more effectively be screened using different magnetic separation strengths.
Preferably, shaking table used is cloud tin shaking table, and using the cutting bed surface for sorting fine-grained minerals, in order to guarantee
The effect of shaking table screening, adjustment stroke are 10mm~16mm, and jig frequency is 330r/min~340r/min.
Preferably, the process that high intensity magnetic mineral is sorted using shaking table be at least one roughing, it is secondary scan, primary cleaning, one
It is secondary to select again.
Preferably, strong magnetic chats is at least one roughing, once purging selection, recleaning, one using the process that shaking table sorts
It is secondary to select again.
Compared with prior art, the positive effect of the present invention shows themselves in that
(1) present invention using the cooperation of stage grinding and Ai Sa grinding machine so that chromite will be completely dissociated with gangue mineral, and
The grade that chromite can effectively be controlled concentrates in a relatively narrow section (0.025-0.045mm), then is equipped with selectivity more
The multiple screening of good high gradient magnetic separator and cloud tin shaking table, can make Cr in chromite2O3Content be up to 60% or more, from
And achieve the purpose that the high-end chemical industry grade chromite concentrate of output, and recovery rate of concentrate is high.
(2) present invention is single pure physical upgrading technique, is free of floatation process, that is, is not required to add any poisonous and hazardous choosing
Mine medicament, and the beneficiation wastewater of institute's output can be recycled all, will not be impacted to ecological environment, and process is simple, but
It is able to achieve the screening of high-grade chromite.
(3) technique is applied widely, is not influenced by external environments such as height above sea level, weather, temperature.The technique was being implemented
Cheng Zhong, in addition to power cost, it is only necessary to consume water, and to water quality no requirement (NR), therefore, compared with metallurgical technology, cost obviously drops
It is low.
(4) rod mill is not only high-efficient in coarse grain ore grinding, while can be effectively controlled the overground of mineral, prevents ore mud
Change phenomenon；In fine fraction secondary grinding, Chinese mugwort Sa mill function controls mineral grade in very narrow range, to realize narrow grain
Grade ore dressing.The two is combined, loss of the valuable mineral in discarding coarse tailing and recleaning can be effectively reduced, improves mine
Select efficiency.
Detailed description of the invention
Fig. 1 is mineral processing circuit figure of the invention, wherein strong magnetic selected 1 refers to selected for the first time, strong selected 2 finger second of magnetic
It is secondary selected.
Specific embodiment
The present invention is specifically described below by embodiment, it is necessary to which indicated herein is that following embodiment is only used
It is further detailed in the present invention, should not be understood as limiting the scope of the invention, which is skilled in technique
Some nonessential modifications and adaptations that personnel are made according to foregoing invention content, still fall within protection scope of the present invention.
Embodiment 1
Sample ore is Xinjiang chromite, raw ore Cr2O3Content is 32.55%, SiO2Content is 12.63%, process mineralogy
Studies have shown that Chromium in Ores mineral are mainly chromite, a small amount of chromium-rich spinelle: gangue mineral is mainly talcum, and secondary is snake
Line stone and carbonate mineral.For the ore, sorted using process flow as shown in Figure 1, specific process parameter is as follows:
A. after being roughly ground using rod mill to raw ore, the mineral granularity in ore pulp is -0.074mm, and mass fraction is
65%；
B. magnetic separation strength when strong magnetic throws tail is 1.1T, and stroke 23mm, jig frequency is 300 beats/min；
C. the rough concentrate obtained after strong magnetic throwing tail is ended after the fine grinding of Sa grinding machine, and the mineral granularity in ore pulp is -0.045mm,
Mass fraction is 85%, wherein the mineral content in -0.045mm to the section -0.025mm accounts for the 83% of -0.045mm ore pulp total amount；
D. it is 1.1T that selected twice, selected for the first time magnetic field strength is carried out to the ore pulp after fine grinding, and second selected
Magnetic field strength is 0.8T；
E. the concentrate and chats that obtain after selected twice are repeatedly screened using cloud tin shaking table, shaking table stroke is
14mm, jig frequency 340r/min.
In finally obtained concentrate, Cr2O3Content is 60.88%, SiO2Content is 0.93%, Cr2O3The rate of recovery is
63.25%.
Embodiment 2
Sample ore is Tibet chromite, raw ore Cr2O3Content is 30.12%, SiO2Content is 13.88%, process mineralogy
Studies have shown that Chromium in Ores mineral are mainly alumcromite, a small amount of chromium-rich spinelle；Gangue mineral is mainly serpentine, secondary
For forsterite and carbonate mineral.It for the ore, is sorted using process flow as shown in Figure 1, concrete technology ginseng
Number is as follows:
A. after being roughly ground using rod mill to raw ore, the mineral granularity in ore pulp is -0.074mm, and mass fraction is
60%；
B. magnetic separation strength when strong magnetic throws tail is 1.4T, and stroke 26mm, jig frequency is 300 beats/min；
C. the rough concentrate obtained after strong magnetic throwing tail is ended after the fine grinding of Sa grinding machine, and the mineral granularity in ore pulp is -0.045mm,
Mass fraction is 87%, wherein the mineral content in -0.045mm to the section -0.025mm accounts for the 85% of -0.045mm ore pulp total amount；
D. it is 1.4T that selected twice, selected for the first time magnetic field strength is carried out to the ore pulp after fine grinding, and second selected
Magnetic field strength is 1.1T；
E. the concentrate and chats that obtain after selected twice are repeatedly screened using cloud tin shaking table, shaking table stroke is
16mm, jig frequency 340r/min.
In finally obtained concentrate, Cr2O3Content is 60.69%, SiO2Content is 1.03%, Cr2O3The rate of recovery is
62.87%.
Embodiment 3
Sample ore is Tibet chromite, raw ore Cr2O3Content is 43.60%, SiO2Content is 9.20%, process mineralogy
Studies have shown that Chromium in Ores mineral are mainly alumcromite, secondary is chromite and a small amount of chromium-rich spinelle；Gangue mineral master
It to be forsterite, secondary is serpentine, a small amount of chlorite and quartz.For the ore, using process flow as shown in Figure 1
It is sorted, specific process parameter is as follows:
A. after being roughly ground using rod mill to raw ore, the mineral granularity in ore pulp is -0.074mm, and mass fraction is
58%；
B. magnetic separation strength when strong magnetic throws tail is 1.2T, and stroke 18mm, jig frequency is 240 beats/min；
C. the rough concentrate obtained after strong magnetic throwing tail is ended after the fine grinding of Sa grinding machine, and the mineral granularity in ore pulp is -0.045mm,
Mass fraction is 72%, wherein the mineral content in -0.045mm to the section -0.025mm accounts for the 80% of -0.045mm ore pulp total amount；
D. it is 1.2T that selected twice, selected for the first time magnetic field strength is carried out to the ore pulp after fine grinding, and second selected
Magnetic field strength is 0.9T；
E. the concentrate and chats that obtain after selected twice are repeatedly screened using cloud tin shaking table, shaking table stroke is
14mm, jig frequency 330r/min.
In finally obtained concentrate, Cr2O3Content is 61.28%, SiO2Content is 0.75%, Cr2O3The rate of recovery is
81.68%.
Embodiment 4
Sample ore is Gansu chromite, raw ore Cr2O3Content is 38.63%, SiO2Content is 10.16%, process mineralogy
Studies have shown that Chromium in Ores mineral are mainly alumcromite, secondary is chromite；Gangue mineral is mainly serpentine and olivine,
Secondary is chlorite and talcum.For the ore, sorted using process flow as shown in Figure 1, specific process parameter is as follows:
A. after being roughly ground using rod mill to raw ore, the mineral granularity in ore pulp is -0.074mm, and mass fraction is
62%；
B. it is 1.2T that strong magnetic, which throws the magnetic separation strength when rough concentrate obtained after tail throws tail through the strong magnetic of Chinese mugwort Sa grinding machine, and stroke is
20mm, jig frequency are 280 beats/min；
C. the rough concentrate obtained after strong magnetic throwing tail is ended after the fine grinding of Sa grinding machine, and the mineral granularity in ore pulp is -0.045mm,
Mass fraction is 78%, wherein the mineral content in -0.045mm to the section -0.025mm accounts for the 85% of -0.045mm ore pulp total amount；
D. it is 1.1T that selected twice, selected for the first time magnetic field strength is carried out to the ore pulp after fine grinding, and second selected
Magnetic field strength is 1.0T；
E. the concentrate and chats that obtain after selected twice are repeatedly screened using cloud tin shaking table, shaking table stroke is
12mm, jig frequency 340r/min.
In finally obtained concentrate, Cr2O3Content is 61.63%, SiO2Content is 0.81%, Cr2O3The rate of recovery is
70.87%.
Claims (5)
1. a kind of ore-dressing technique of output chemical industry grade chromite concentrate, which is characterized in that real using the ore-dressing technique of rank mill rank choosing
Existing Cr2O3Sorting for the high-grade chromite of content >=30%, specifically comprises the following steps:
A. raw ore carries out strong magnetic and throws tail, obtain rough concentrate ore pulp after rod mill is roughly ground；
B. the mass fraction of rough concentrate ore pulp is adjusted to 50%~60%；
C. the ore pulp after sizing mixing is ended after the fine grinding of Sa grinding machine, and it is selected to carry out strong magnetic, obtains concentrate and chats；
D. the concentrate and chats obtained after strong magnetic is selected, which is respectively adopted, obtains final concentrate product after shaking table is repeatedly sorted
And tailing；
Wherein, mineral granularity is -0.074mm after roughly grinding described in step a, and mineral quality score is 55%~70%；
Wherein, in ore pulp of the ore after the Sa grinding machine fine grinding that ends, the granularities of mineral is -0.045mm, mass fraction is 70%~
85%, wherein mineral content of the granularity in -0.045mm to the section -0.025mm accounts for 80% or more of -0.045mm mineral total amount.
2. a kind of ore-dressing technique of output chemical industry grade chromite concentrate according to claim 1, it is characterised in that: high intensity magnetic separation
Equipment used is high gradient magnetic separator, and stroke is 16mm~26mm, and jig frequency is 200 beats/min~300 beats/min.
3. a kind of ore-dressing technique of output chemical industry grade chromite concentrate according to claim 1, it is characterised in that: step a
In magnetic field strength of strong magnetic when throwing tail be 1.1T~1.4T.
4. a kind of ore-dressing technique of output chemical industry grade chromite concentrate according to claim 1, it is characterised in that: strong magnetic essence
The number of choosing is selected 2 times, wherein magnetic field strength selected for the first time is 1.1T~1.4T, second of selected magnetic field strength
For 0.8T~1.1T.
5. a kind of ore-dressing technique of output chemical industry grade chromite concentrate according to claim 1, it is characterised in that:
A, shaking table used is cloud tin shaking table, and using the cutting bed surface for sorting fine-grained minerals, stroke is 10mm~16mm,
Jig frequency is 330r/min~340r/min；
B, the process that the concentrate after strong magnetic is selected uses shaking table to sort for one roughing, it is secondary scan, primary cleaning, it is primary again
Choosing；
C, the process that the chats after strong magnetic is selected uses shaking table to sort for one roughing, once purging selection, recleaning, it is primary again
Choosing.
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| CN109465095A (en) * | 2018-11-09 | 2019-03-15 | 黑龙江多宝山铜业股份有限公司 | It is a kind of to drop miscellaneous milling method for copper concentrate upgrading |
| CN112474057B (en) * | 2020-11-09 | 2022-08-05 | 攀钢集团攀枝花钢铁研究院有限公司 | Method for desulfurizing sulfur-containing vanadium-titanium-iron ore concentrate and recovering sulfur-cobalt ore concentrate |
| CN115888943A (en) * | 2022-10-28 | 2023-04-04 | 鞍钢集团矿业有限公司 | Short-process efficient grinding and sorting process for micro-fine particle lean magnetic iron ore |
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|---|---|---|---|---|
| US5595347A (en) * | 1990-08-30 | 1997-01-21 | Austpac Gold N.L. | Process for separating ilmenite |
| CN102836777A (en) * | 2012-09-18 | 2012-12-26 | 镇康县金宏矿业有限公司 | Ore dressing technology for comprehensively recovering lean and fine wiikite |
| CN103657841A (en) * | 2013-12-09 | 2014-03-26 | 攀钢集团矿业有限公司 | Production method of vanadium-titanium-ferrum concentrate |
| CN105327772A (en) * | 2015-12-08 | 2016-02-17 | 中国地质科学院郑州矿产综合利用研究所 | Pre-desliming beneficiation method for fine-grain embedded molybdenum ore |
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2018
- 2018-03-20 CN CN201810228535.2A patent/CN108580022B/en not_active Expired - Fee Related
Patent Citations (4)
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|---|---|---|---|---|
| US5595347A (en) * | 1990-08-30 | 1997-01-21 | Austpac Gold N.L. | Process for separating ilmenite |
| CN102836777A (en) * | 2012-09-18 | 2012-12-26 | 镇康县金宏矿业有限公司 | Ore dressing technology for comprehensively recovering lean and fine wiikite |
| CN103657841A (en) * | 2013-12-09 | 2014-03-26 | 攀钢集团矿业有限公司 | Production method of vanadium-titanium-ferrum concentrate |
| CN105327772A (en) * | 2015-12-08 | 2016-02-17 | 中国地质科学院郑州矿产综合利用研究所 | Pre-desliming beneficiation method for fine-grain embedded molybdenum ore |
Non-Patent Citations (1)
| Title |
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| 从米易橄榄岩体低品位铬矿石中回收铬铁矿研究;雷力等;《四川地质学报》;20120915;第214-217页 * |
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