CN103878111B - A kind of beneficiation new process of high-grade chromite ore - Google Patents
A kind of beneficiation new process of high-grade chromite ore Download PDFInfo
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- CN103878111B CN103878111B CN201410121123.0A CN201410121123A CN103878111B CN 103878111 B CN103878111 B CN 103878111B CN 201410121123 A CN201410121123 A CN 201410121123A CN 103878111 B CN103878111 B CN 103878111B
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- 238000000034 method Methods 0.000 title claims abstract description 41
- 239000012141 concentrate Substances 0.000 claims abstract description 28
- 239000006148 magnetic separator Substances 0.000 claims abstract description 20
- 238000010334 sieve classification Methods 0.000 claims abstract description 13
- 238000007885 magnetic separation Methods 0.000 claims abstract description 11
- 239000011435 rock Substances 0.000 claims abstract description 11
- 238000012545 processing Methods 0.000 claims abstract description 5
- 238000013467 fragmentation Methods 0.000 claims abstract description 4
- 238000006062 fragmentation reaction Methods 0.000 claims abstract description 4
- 238000010926 purge Methods 0.000 claims description 6
- 238000004140 cleaning Methods 0.000 claims description 4
- 238000012827 research and development Methods 0.000 claims description 2
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 abstract description 19
- 229910052500 inorganic mineral Inorganic materials 0.000 abstract description 13
- 239000011707 mineral Substances 0.000 abstract description 13
- 238000005265 energy consumption Methods 0.000 abstract description 3
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 abstract description 2
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 abstract description 2
- 229910052598 goethite Inorganic materials 0.000 abstract description 2
- AEIXRCIKZIZYPM-UHFFFAOYSA-M hydroxy(oxo)iron Chemical compound [O][Fe]O AEIXRCIKZIZYPM-UHFFFAOYSA-M 0.000 abstract description 2
- LIKBJVNGSGBSGK-UHFFFAOYSA-N iron(3+);oxygen(2-) Chemical compound [O-2].[O-2].[O-2].[Fe+3].[Fe+3] LIKBJVNGSGBSGK-UHFFFAOYSA-N 0.000 abstract description 2
- 230000005389 magnetism Effects 0.000 abstract description 2
- 229910052748 manganese Inorganic materials 0.000 abstract description 2
- 239000011572 manganese Substances 0.000 abstract description 2
- 229910021646 siderite Inorganic materials 0.000 abstract description 2
- 235000008504 concentrate Nutrition 0.000 description 21
- 239000011651 chromium Substances 0.000 description 20
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 16
- 229910052742 iron Inorganic materials 0.000 description 8
- 238000004458 analytical method Methods 0.000 description 6
- 238000000926 separation method Methods 0.000 description 6
- 229910052804 chromium Inorganic materials 0.000 description 5
- 238000011084 recovery Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- WYTGDNHDOZPMIW-RCBQFDQVSA-N alstonine Natural products C1=CC2=C3C=CC=CC3=NC2=C2N1C[C@H]1[C@H](C)OC=C(C(=O)OC)[C@H]1C2 WYTGDNHDOZPMIW-RCBQFDQVSA-N 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- HEQBUZNAOJCRSL-UHFFFAOYSA-N iron(ii) chromite Chemical compound [O-2].[O-2].[O-2].[Cr+3].[Fe+3] HEQBUZNAOJCRSL-UHFFFAOYSA-N 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000010450 olivine Substances 0.000 description 2
- 229910052609 olivine Inorganic materials 0.000 description 2
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 2
- 229910052611 pyroxene Inorganic materials 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 238000012216 screening Methods 0.000 description 2
- 235000009854 Cucurbita moschata Nutrition 0.000 description 1
- 240000001980 Cucurbita pepo Species 0.000 description 1
- 235000009852 Cucurbita pepo Nutrition 0.000 description 1
- 229910004283 SiO 4 Inorganic materials 0.000 description 1
- 238000003723 Smelting Methods 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000000262 chemical ionisation mass spectrometry Methods 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 229910017052 cobalt Inorganic materials 0.000 description 1
- 239000010941 cobalt Substances 0.000 description 1
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000006246 high-intensity magnetic separator Substances 0.000 description 1
- 230000008676 import Effects 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 239000000696 magnetic material Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 229910052697 platinum Inorganic materials 0.000 description 1
- 229910052761 rare earth metal Inorganic materials 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- -1 rubidium iron boron rareearth Chemical class 0.000 description 1
- 235000020354 squash Nutrition 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 229910052720 vanadium Inorganic materials 0.000 description 1
- LEONUFNNVUYDNQ-UHFFFAOYSA-N vanadium atom Chemical compound [V] LEONUFNNVUYDNQ-UHFFFAOYSA-N 0.000 description 1
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- Manufacture And Refinement Of Metals (AREA)
Abstract
The invention discloses a kind of beneficiation new process of high-grade chromite ore, adopt following processing step: chromite ore is after fragmentation, sieve classification is+20mm grade ,-20mm grade, and wherein+20mm grade adopts artificial backhand choosing or jigging to dish out after bulk barren rock and obtains block concentrate.Narrow for-20mm grade rank sieve classification is gone out four grade: 20 ~ 15mm, 15 ~ 6mm, 6 ~ 2mm, 2 ~ 0mm; Permanent magnet roller type strong magnetic separator is adopted to carry out dry high-magnetic separation to 20 ~ 15mm, 15 ~ 6mm, 6 ~ 2mm, tri-grades; Be 2 ~ 0.8mm, 0.8 ~ 0mm, two grades to the further sieve classification of 2 ~ 0mm grade, adopt table concentration to obtain table concentration concentrate to 2 ~ 0.8mm grade, adopt spiral chute, table concentration combined process flow to obtain fine-grained re-election concentrate to 0.8 ~ 0mm grade.The present invention can obtain concentrate in advance, throw except mine tailing, this ore-dressing technique have the advantage lower than other process energy consumptions, sorting not only for chrome ore, also can be used for sorting of other weak magnetism mineral such as manganese ore, bloodstone, goethite, siderite, limonite.
Description
Technical field
The present invention relates to chrome ore technique of preparing, be specifically related to the ore-dressing technique of chromite ore, be particularly suitable for Cr in chromite ore
2o
3content>=30% or Cr
2o
3the ore dressing of the high-grade chromite ore of content between 30% ~ 36% is reclaimed, and also can be used for sorting of other weak magnetism mineral such as manganese ore, bloodstone, goethite, siderite, limonite.
Background technology
Chromium is as the most important element of stainless steel industry, and chrome ore is the indispensable strategic resource of national economy and national defence hard-core technology. and in China, chrome ore belongs to short mineral, 0.01% of the not enough world of chrome ore reserves of China.Picotite mineral common in China's chromite ore have chromite [(Mg, Fe) Cr
2o
4], alumcromite [(Mg, Fe) (Cr, A1)
2o
4] and rich picotite [Fe (Cr, A1)
2o
4] etc.; Gangue mineral mainly contains olivine, serpentine and pyroxene etc.; Sometimes a small amount of vanadium of association, nickel, cobalt and platinum family element.
For meeting the demand of domestic chrome ore, some companies of recent year go abroad purchase, develop overseas chromium ore resource.Since two thousand six, source and the kind of China's import chrome ore increase gradually, progressively define at present based on South Africa Iron Ores, Turkey and Indian Iron Ore, the situation in collocation other countries ore deposit.Over the past two years, China also developed the mineral such as Oman ore deposit, Albanian ore deposit, Philippine ore deposit and Zimbabwe ore deposit.But the chromium ore resource condition that China purchases abroad is poor, disseminated grain size is thin, grade is low, impurity and harmful element many, ore dressing difficulty is large, and the chrome ore that can directly carry out smelting is little.Generally all need to sort and could obtain qualified concentrate containing.
The main beneficiation method of chrome ore lump ore and the deficiency of existence have:
(1) picking: picking is according to the difference in the outward appearance (color, gloss shape etc.) between ore and barren rock, with manually carrying out sorting to ore or barren rock.Because only distinguish ore and barren rock with visually observing, being difficult to accurate sorting, causing that concentrate grade is low or loss late is too high;
(2) heavymedia separation: by the heavy-fluid of density between valuable mineral and gangue mineral or heavy suspension as medium, the ore particle making density be less than medium floats on dielectric surface, density is sunken to container bottom under being greater than the ore particle of medium, to reach the object of sorting.Dense media price is higher, and dense media loses general larger in ore dressing process.
(3) jigging: jigging is the country rock and horsestone that utilize the density contrast of ore and barren rock to get rid of to bring into when digging up mine, jigging compared with dense media in the ordinary course of things sorting index to differ from, but do not need medium, equipment and process CIMS simple;
(4) washup: washup mainly removes clay and the low-grade gangue of particulate.
In " weak magnetic-strong magnetic technique sorts the experimental study of the high ferro chromite " paper delivered " Mineral Engineering " in April, 2010, low intensity magnetic separation is first carried out to certain high ferro chromite and reclaims magnetic iron ore, rear employing high intensity magnetic separation reclaims chromite, result of study shows, adopt low intensity magnetic separation-high intensity magnetic separation flow process, can from containing Cr
2o
3be 31.23%, be obtain Cr in the raw ore of 28.81% containing Fe
2o
3grade is 41.43%, the rate of recovery be 79.31% fine chrome mine and TFe grade be 55.89%, the rate of recovery is the iron ore concentrate of 58.71%.But should " weak magnetic-strong magnetic technique " need whole chromite ore be milled down to 0.1 ~ 0.5mm, wherein+0.5mm grade productive rate is only about 0.3% ,-0.1mm grade productive rate and is less than 3%.This ore-dressing technique is due to needs ore grinding, and energy resource consumption is high; Judge according to this article result of the test, the high intensity magnetic separation equipment of process 0.1 ~ 0.5mm grade chromite ore should be electromagnetism High gradient high intensity magnetic separator, is also highly energy-consuming equipment.And, the ore-dressing technique that this article provides also can only realize in laboratory, industrially cannot realize on a large scale, no matter because adopt which kind of grinding attachment, also cannot accurately accomplish " whole chromite ore being milled down to 0.1 ~ 0.5mm; wherein+0.5mm grade productive rate is only about 0.3% ,-0.1mm grade productive rate and is less than 3% ".
Summary of the invention
Object of the present invention is exactly for the above-mentioned problems in the prior art, and provide a kind of mineral processing circuit comparatively simple, can in advance concentrate, throw the beneficiation new process of mine tailing, high-grade chromite ore that ore dressing energy consumption is low.
The specific susceptibility of chromite is 900 ~ 136.51 х 10
-6cm
3/ g, and olivine (Mg, Fe)
2[SiO
4] specific susceptibility is 14.86 ~ 9.92 х 10
-6cm
3/ g, serpentine (Mg
6(Si
4o
10) (OH)
8specific susceptibility is 13.3 ~ 17.1 х 10
-6cm
3/ g, pyroxene Ca(Mg, Fe, Al) [(Si, Al)
2o
6] specific susceptibility is 30 ~ 90 х 10
-6cm
3/ g.The specific susceptibility of specific susceptibility much larger than gangue mineral of chromite can be found out.Therefore utilize the otherness of specific susceptibility between chrome ore with main gangue to adopt strong magnetic dry type magnetic separation method can realize being separated of ore and gangue, reach the object improving chrome ore lump ore grade.
For realizing the object of the present invention, the beneficiation new process of a kind of high-grade chromite ore of the present invention is achieved through the following technical solutions.
Chromite ore is after fragmentation, and sieve classification is+20mm grade ,-20mm grade, and wherein+20mm grade adopts artificial backhand choosing or jigging to dish out after bulk barren rock and obtains block concentrate.P-20mm grade adopts following processing step:
(1) narrow for-20mm grade rank sieve classification is gone out four grade: 20 ~ 15mm, 15 ~ 6mm, 6 ~ 2mm, 2 ~ 0mm;
(2) permanent magnet roller type strong magnetic separator is adopted to carry out dry high-magnetic separation respectively to 20 ~ 15mm, 15 ~ 6mm, 6 ~ 2mm, tri-grades, giving barrow tape speed, body centre and being separated clapboard spacing by adjustment permanent magnet roller type strong magnetic separator, obtain the best and sort technical indicator, the belt surface magnetic field intensity of described permanent magnet roller type strong magnetic separator is 0.9 ~ 1.3T;
(3) be 2 ~ 0.8mm, 0.8 ~ 0mm, two grades to the further sieve classification of 2 ~ 0mm grade, adopt table concentration to obtain table concentration concentrate to 2 ~ 0.8mm grade, adopt spiral chute, table concentration combined process flow to obtain fine-grained re-election concentrate to 0.8 ~ 0mm grade.
For improving permanent magnet roller type strong magnetic separator to the separating effect of 20 ~ 15mm, 15 ~ 6mm, 6 ~ 2mm, tri-grades, the belt surface magnetic field intensity of described permanent magnet roller type strong magnetic separator is that 1.0 ~ 1.2T is advisable; Belt speed 1.0 ~ the 1.3m/s of described permanent magnet roller type strong magnetic separator, body centre are good with to be separated clapboard spacing be 28 ~ 35cm.
The YCG series coarse grain permanent magnet roller type strong magnetic separator that the permanent magnet roller type strong magnetic separator that the present invention adopts preferably adopts Zhong Gang Group, AnHui TianYuan Science Co., Ltd to research and develop, barrel diameter Ф 350 ~ 500mm.
The present invention adopts the flow process of table concentration to be generally one roughing, primary cleaning to 2 ~ 0.8mm grade;
The present invention to 0.8 ~ 0mm grade, adopts that spiral chute is roughly selected, spiral chute selected acquisition high-purity fine-grained re-election concentrate; After spiral chute roughing tailings, spiral chute cleaner tailings merge, then scan through spiral chute once purging selection, spiral chute secondary, table concentration obtains time high-purity fine-grained re-election concentrate.One spiral chute operation is also provided with between scanning at spiral chute once purging selection, spiral chute secondary.
When+20mm grade adopts artificial backhand to select, for improving the separating effect of+20mm grade further, through research, can also be+75mm, 75 ~ 60mm, 60 ~ 40mm, 40 ~ 20mm by the screening of+20mm grade, adopt artificial backhand to select the barren rock be mixed into these four grades respectively.
Compared with prior art, after the beneficiation new process of a kind of high-grade of the present invention chromite ore adopts above technical scheme, tool has the following advantages:
(1) by chromite ore sieve classification be the narrow rank of+20mm, 20 ~ 15mm, 15 ~ 6mm, 6 ~ 2mm, 2 ~ 0mm five and above grade, according to narrow gradation, for the sharpness of separation improving chromite, very favourable.
(2) permanent magnet roller type strong magnetic separator is adopted to sort to 20 ~ 15mm, 15 ~ 6mm, 6 ~ 2mm, tri-grades, both can reclaim weak magnetic chrome ore, can throw except qualified tailings again, decrease the follow-up ore deposit amount sorted, also reduce subsequent job equipment needed thereby number of units, energy conservation and consumption reduction effects is remarkable simultaneously.
(3) do not adopt the grinding operation of highly energy-consuming, the equipment that whole mineral processing circuit adopts is all technique, the equipment of energy-saving and environmental protection, and production cost is lower.
Accompanying drawing explanation
The principle process chart of Fig. 1 to be the present invention to 20 ~ 15mm, 15 ~ 6mm, 6 ~ 2mm, tri-grades carry out permanent magnetic strong magnetic dry separation;
Fig. 2 be the present invention to 20 ~ 15mm, 15 ~ 6mm, 6 ~ 2mm, tri-grades carry out permanent magnetic strong magnetic dry separation implementing process flow chart;
Fig. 3 is the table concentration process chart that the present invention adopts 2 ~ 0.8mm grade;
Fig. 4 is spiral chute, the table concentration combined process flow figure that the present invention adopts 0.8 ~ 0mm grade.
Detailed description of the invention
For describing the present invention, be described in further detail below in conjunction with the beneficiation new process of drawings and Examples to a kind of high-grade chromite ore of the present invention.
Sample ore is middle steel South Africa Ge Ye Co., Ltd DCM chrome ore, and the main valuable element of ore is chromium, Cr
2o
3content is 34.49%; Main impurity component is SiO respectively
2, MgO and Al
2o
3, three's content is respectively 14.66%, 13.90% and 11.15%.Raw ore chemistry multielement analysis the results are shown in Table 1, and other property analysis of raw ore is respectively in table 2, table 3, table 4.The Fe clusters analysis result of raw ore is in table 5.
Table 1 sample chemistry multielement analysis result (%)
Table 2 sample chromium material phase analysis result (%)
The mineral composition of table 3 sample and relative amount (%)
Table 4 monomineralic rocks of chromite chemical composition (%)
Fe clusters analysis result (%) in table 5 sample
Chromite ore is after fragmentation, and sieve classification is+20mm grade ,-20mm grade, and wherein+20mm grade adopts artificial backhand choosing or jigging to dish out after bulk barren rock and obtains block concentrate.Narrow for-20mm grade rank sieve classification is gone out four grade: 20 ~ 15mm, 15 ~ 6mm, 6 ~ 2mm, 2 ~ 0mm, then is 2 ~ 0.8mm, 0.8 ~ 0mm, two grades by further for 2 ~ 0mm sieve classification.
As shown in Figure 2 of the present invention to 20 ~ 15mm, 15 ~ 6mm, 6 ~ 2mm, tri-grades carry out permanent magnetic strong magnetic dry separation implementing process flow chart and composition graphs 1 find out, by 20mm-2mm grade, by screening, be divided into 20-15, the grade that 15-6,6-2mm tri-is different, by carrying out dry high-magnetic separation separately to the material of three grades, by one section of dry high-magnetic separation, can throw except qualified tailings.By regulating belt speed, body centre and being separated clapboard spacing and adjusting mine tailing productive rate.Belt speed 1.10m/s, body centre be separated clapboard spacing 32cm.In actual applications, belt speed and body centre be separated clapboard spacing and can regulate according to handled ore situation, concentrate quality requirement.
Dry high-magnetic separation adopts the YCG series coarse grain permanent magnet roller type strong magnetic separator of Zhong Gang Group, AnHui TianYuan Science Co., Ltd's research and development, this coarse grain permanent magnet roller type strong magnetic separator selects high-performance rubidium iron boron rareearth magnetic material, take squash type magnetic Circuit Design, have that magnetic induction intensity is high, magnetic field gradient is large, power consumption is low, in roller without eddy current, do not block, the feature such as feed particle size is large.
The barrel diameter Ф 350mm of this coarse grain permanent magnet roller type strong magnetic separator, roller Surface field intensity 1.2 ~ 1.4T, belt surface magnetic field intensity 1.0 ~ 1.2T, the effective sorting width of belt 1.0 ~ 1.2m, device processes ability 40 ~ 50t/h.
The present invention as shown in Figure 3 finds out the table concentration process chart that 2 ~ 0.8mm grade adopts, and adopt table concentration to 2 ~ 0.8mm grade, the flow process of table concentration is one roughing, primary cleaning.Cr in 2 ~ 0.8mm grade raw ore
2o
3content is 31.74%, through one roughing, primary cleaning, obtains Cr
2o
3content is the table concentration concentrate of 41.89%.
The spiral chute that the present invention as shown in Figure 4 adopts 0.8 ~ 0mm grade, table concentration combined process flow figure find out, Cr in 0.8 ~ 0mm grade raw ore
2o
3content is 41.27%.To 0.8 ~ 0mm grade, employing spiral chute is roughly selected, spiral chute selected acquisition Cr
2o
3grade is the high-purity fine-grained re-election concentrate-A00 concentrate of 45.64%; After spiral chute roughing tailings, spiral chute cleaner tailings merge, scan through spiral chute once purging selection, spiral chute secondary again, table concentration, also be provided with one spiral chute operation between scanning at spiral chute once purging selection, spiral chute secondary, finally obtain Cr
2o
3grade is the secondary high-purity fine-grained re-election concentrate-A20 concentrate of 42.05%%.Cr in A00 concentrate, A20 concentrate
2o
3comprehensive recovery up to 90.03%.
After the beneficiation new process of a kind of high-grade of the present invention chromite ore adopts above comprehensive technological scheme, Cr in block concentrate, strong magnetic dry separation concentrate, table concentration concentrate, A00 concentrate, A20 concentrate
2o
3overall recovery up to 86.52%.
Claims (5)
1. the beneficiation new process of a high-grade chromite ore, chromite ore is after fragmentation, sieve classification is+20mm grade ,-20mm grade, and wherein+20mm grade adopts artificial backhand choosing or jigging to dish out after bulk barren rock and obtains block concentrate, it is characterized in that also adopting following processing step:
(1) narrow for-20mm grade rank sieve classification is gone out four grade: 20 ~ 15mm, 15 ~ 6mm, 6 ~ 2mm, 2 ~ 0mm;
(2) permanent magnet roller type strong magnetic separator is adopted to carry out dry high-magnetic separation respectively to 20 ~ 15mm, 15 ~ 6mm, 6 ~ 2mm, tri-grades, giving barrow tape speed, body centre and being separated clapboard spacing by adjustment permanent magnet roller type strong magnetic separator, obtain the best and sort technical indicator, the belt surface magnetic field intensity of described permanent magnet roller type strong magnetic separator is 0.9 ~ 1.3T;
(3) be 2 ~ 0.8mm, 0.8 ~ 0mm, two grades to the further sieve classification of 2 ~ 0mm grade;
Adopt table concentration to 2 ~ 0.8mm grade, the flow process of table concentration is one roughing, primary cleaning;
To 0.8 ~ 0mm grade, employing spiral chute is roughly selected, spiral chute selected acquisition high-purity fine-grained re-election concentrate; After spiral chute roughing tailings, spiral chute cleaner tailings merge, then scan through spiral chute once purging selection, spiral chute secondary, table concentration obtains time high-purity fine-grained re-election concentrate.
2. the beneficiation new process of a kind of high-grade chromite ore as claimed in claim 1, is characterized in that: be also provided with one spiral chute operation between scanning at spiral chute once purging selection, spiral chute secondary.
3. the beneficiation new process of a kind of high-grade chromite ore as claimed in claim 2, is characterized in that: the belt surface magnetic field intensity of described permanent magnet roller type strong magnetic separator is 1.0 ~ 1.2T.
4. the beneficiation new process of a kind of high-grade chromite ore as claimed in claim 3, is characterized in that: the belt speed 1.0 ~ 1.3m/s of described permanent magnet roller type strong magnetic separator, body centre is 28 ~ 35cm with being separated clapboard spacing.
5. the beneficiation new process of a kind of high-grade chromite ore as claimed in claim 1 or 2, it is characterized in that: described permanent magnet roller type strong magnetic separator is the YCG series coarse grain permanent magnet roller type strong magnetic separator of Zhong Gang Group, AnHui TianYuan Science Co., Ltd's research and development, barrel diameter Ф 350 ~ 500mm.
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