CN103041912B - Beneficiation method of low-grade ilmenite - Google Patents
Beneficiation method of low-grade ilmenite Download PDFInfo
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- CN103041912B CN103041912B CN201210529284.4A CN201210529284A CN103041912B CN 103041912 B CN103041912 B CN 103041912B CN 201210529284 A CN201210529284 A CN 201210529284A CN 103041912 B CN103041912 B CN 103041912B
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Abstract
The invention provides a beneficiation method of low-grade ilmenite. The beneficiation method includes the following steps: screening and grading raw ore to obtain coarse grain materials and fine grain materials, subjecting the coarse grain materials and fine grain materials to first-stage iron removal respectively to obtain coarse grain iron tailings, fine grain iron tailings and inferior iron ore concentrates, subjecting the coarse grain iron tailings with iron removed to first-stage high intensity magnetic separation to obtain high intensity concentrates and tailings, subjecting the high intensity concentrates to spiral gravity to obtain gravity concentrates and subjecting the gravity concentrates to ore grinding, subjecting the fine grain iron tailings with iron removed to first-stage high intensity magnetic separation and second-stage high intensity magnetic separation sequentially to obtain high intensity magnetic concentrates and mixing the high intensity magnetic concentrates with the gravity concentrates with ore ground to be graded, and subjecting the unqualified graded mixed concentrates to ore grinding and subjecting the qualified mixed concentrates to second-stage iron removal, three-stage high intensity magnetic separation and flotation sequentially to obtain the final ilmenite concentrates. The beneficiation method of ilmenite is applicable to low-grade ilmenite. According to the beneficiation method, the quality of the ilmenite concentrates can be ensured while the recovery of the ilmenite concentrates can be improved, thereby great economic benefit can be obtained.
Description
Technical field
The present invention relates to a kind of beneficiation method, relate in particular to a kind of ore dressing new method of low-grade ilmenite.
Background technology
Chinese Titanium resource occupies first of the world, and reserves account for 40% of the world, wherein more than 90% in Panxi Area, Sichuan Province.The titanium resource of Panxi Diqu is mainly the vanadium titano-magnetite of ore type, and wherein calcium-magnesium content is higher, belongs to the ilmenite that exploitation are more difficult.At present, mainly to TiO
2iron selection tailings more than content 8wt% carries out the recycling of ilmenite.Along with the expanding day of titanium resource demand, the lower anxious utilization to be developed of iron selection tailings of a large amount of titaniferous that this area exists.Because the type resource titaniferous amount is low, add complicated mineral composition and embedding cloth relation, cause the ilmenite rate of recovery of the type resource low, cost recovery is high.
For TiO
2content is iron selection tailings more than 8wt%, and the at present technological process of main employing " raw ore → every slag → classification → deironing → two section high intensity magnetic separation → flotation " is reclaimed ilmenite, as shown in Figure 1, adopts this flow process can obtain TiO
2grade reaches more than 47% ilmenite concentrate, and the flotation operation rate of recovery reaches more than 75%.But, with above-mentioned technological process to TiO
2when the ilmenite that content is lower reclaims, two sections strong magnetic produce obtain for flotation to ore deposit, TiO
2grade can only reach 9%～12%, and low-grade flotation like this is very unfavorable for flotation to ore deposit, and grade and the rate of recovery that can cause finally obtaining ilmenite concentrate are all undesirable, and floating agent cost is high, cannot reach object economic, that efficiently utilize low-grade titanium resource.
Summary of the invention
The object of the invention is to solve the deficiencies in the prior art, and provide one to be applicable to low-grade ilmenite, in guaranteeing qualified ilmenite concentrate quality, improve the beneficiation method of the ilmenite concentrate rate of recovery.
To achieve these goals, the invention provides a kind of beneficiation method of low-grade ilmenite, described beneficiation method comprises the steps: raw ore to carry out every slag processing; Raw ore after slag is carried out to classification processing, obtain coarse-grained material and fine; Described coarse-grained material and fine are carried out respectively after one section of deironing, obtain coarse grain except iron tailings, particulate are except iron tailings and inferior iron ore concentrate; Described coarse grain, except iron tailings carries out one section of high intensity magnetic separation, is obtained to high intensity magnetic mineral and mine tailing; Described high intensity magnetic mineral is carried out to spiral gravity treatment, obtain gravity concentrate and mine tailing; Described gravity concentrate is delivered to ore grinding processing; Described particulate is except iron tailings is successively through one section of high intensity magnetic separation and two sections of high intensity magnetic separations, and the final high intensity magnetic mineral obtaining mixes with the gravity concentrate after described ore grinding and classification; Defective bulk concentrate after classification is returned to ore grinding step and regrind, qualified bulk concentrate carries out two sections of deironing, obtains two sections except iron tailings and time iron ore concentrate; Remove iron tailings by described two sections and carry out three sections of high intensity magnetic separations, the high intensity magnetic mineral of acquisition obtains final ilmenite concentrate after flotation.
According to the beneficiation method of low-grade ilmenite of the present invention embodiment, in described spiral gravity treatment step, can comprise that the high intensity magnetic mineral that described one section of high intensity magnetic separation is obtained carries out spiral and roughly selects, obtain qualified gravity concentrate, chats and mine tailing, wherein, described chats scans to obtain qualified gravity concentrate through spiral again.
According to the beneficiation method of low-grade ilmenite of the present invention embodiment, described flotation step can comprise floating sulphur and the floating titanium step of carrying out successively, wherein, described floating titanium step can comprise that roughly selecting and will roughly select concentrate obtains final ilmenite concentrate after selected through four times.
According to the beneficiation method of low-grade ilmenite of the present invention embodiment, described after slag the granularity for the raw ore of classification processing be not more than 2mm.
According to the beneficiation method of low-grade ilmenite of the present invention embodiment, described coarse grain is except iron tailings and particulate removes one section of high intensity magnetic separation of iron tailings, the magnetic field intensity of three sections of high intensity magnetic separations is 5000～10000 oersteds, and the magnetic field intensity that described particulate removes two sections of high intensity magnetic separations of iron tailings is 2000～7000 oersteds.
According to the beneficiation method of low-grade ilmenite of the present invention embodiment, the feed ore concentration of described spiral gravity treatment is 25wt%～45wt%.
According to the beneficiation method of low-grade ilmenite of the present invention embodiment, the granularity of described coarse-grained material is greater than 0.154mm, and the granularity of described fine is not more than 0.154mm.
According to the beneficiation method of low-grade ilmenite of the present invention embodiment, can be 40%～60% by the mog control of the gravity concentrate after described ore grinding.
According to the beneficiation method of low-grade ilmenite of the present invention embodiment, TiO in described low-grade ilmenite
2content is 2wt%～7wt%.
Compared with prior art, beneficial effect of the present invention comprises and is applicable to low-grade ilmenite, improve for flotation to ore deposit grade, and reduced the content of its olivine and plagioclase, can in ensureing ilmenite concentrate quality, improve the ilmenite concentrate rate of recovery.
Brief description of the drawings
Fig. 1 is the former mineral processing circuit figure of ilmenite.
Fig. 2 is the mineral processing circuit figure of ilmenite of the present invention.
Detailed description of the invention
Below, describe embodiments of the invention in detail with reference to accompanying drawing.Should be noted, in this manual, related percentage unless otherwise indicated, all refers to percentage by weight, hereinafter will repeat no more.
Fig. 1 is the former mineral processing circuit figure of ilmenite, and Fig. 2 is the mineral processing circuit figure of ilmenite of the present invention.
As shown in Figure 1, former ore-dressing technique is that raw ore is carried out to classification after processing every slag, obtains coarse-grained material and fine, is carried out respectively after one section of deironing, obtains coarse grain except iron tailings, particulate are except iron tailings and inferior iron ore concentrate; Wherein, coarse grain obtains final ilmenite concentrate except iron tailings carries out flotation respectively after two sections of high intensity magnetic separations except iron tailings and particulate.Adopt the technological process shown in Fig. 1 to low-grade (TiO
2content is about 2wt%～7wt%) ilmenite is while reclaiming, due to two sections strong magnetic produce obtain for flotation to ore deposit, TiO
2grade is lower, and the content of olivine and plagioclase is high, and the grade and the rate of recovery that make finally to obtain ilmenite concentrate are all undesirable.
The present invention, in order to reduce the content of olivine and plagioclase, improves the grade of flotation to ore deposit, in ensureing ilmenite concentrate quality, improves the ilmenite concentrate rate of recovery, provides one to be applicable to low-grade (TiO
2content is about 2wt%～7wt%) beneficiation new process of ilmenite.Concrete mineral processing circuit as shown in Figure 2, first ilmenite raw ore is carried out every slag processing, in an example of the present invention, the raw ore that in ilmenite, granularity is greater than 2mm is as mine tailing after processing every slag, and granularity is not more than the raw ore of 2mm and processes for next step.
Raw ore after slag is carried out to classification processing, obtain coarse-grained material and fine, here, the concrete size of coarse-grained material and fine is according to the difference of raw ore and difference, in an example of the present invention, the granularity of described coarse-grained material is greater than 0.154mm, and the granularity of described fine is not more than 0.154mm.Then, coarse-grained material and fine are carried out respectively after one section of deironing, obtain coarse grain except iron tailings, particulate are except iron tailings and inferior iron ore concentrate.
Coarse grain, except iron tailings carries out one section of high intensity magnetic separation, is obtained to high intensity magnetic mineral and mine tailing, and the object of one section of strong magnetic is to utilize the mine tailings such as a large amount of gangue of magnetic mineral difference jettisoning, reduces subsequent handling treating capacity, reduces costs.
The high intensity magnetic mineral of gained carries out spiral gravity treatment, and utilizing the difference of specific gravity of various mineral to dish out affects weak magnetic olivine and the plagioclase of floatation process, obtains gravity concentrate and mine tailing.In an example of the present invention, adopt spiral chute to carry out spiral reselection operation.In spiral reselection operation process, should adopt one slightly to sweep combined process flow, the high intensity magnetic mineral first one section of high intensity magnetic separation being obtained carries out spiral and roughly selects, obtain qualified gravity concentrate, chats and mine tailing, wherein, this chats scans to obtain qualified gravity concentrate through spiral again, and one thick (roughly selecting) is the grade in order to improve final ilmenite concentrate, and sweeping (scanning) is the rate of recovery in order to improve ilmenite.The gravity concentrate of gained is delivered to ore grinding processing, and ore grinding can improve the liberation degree of minerals of mineral.
Described particulate is except iron tailings is successively through one section of high intensity magnetic separation and two sections of high intensity magnetic separations, and the final high intensity magnetic mineral obtaining mixes with the gravity concentrate after described ore grinding and classification.Defective bulk concentrate after classification is returned to ore grinding step and regrind, qualified bulk concentrate carries out two sections of deironing, obtains two sections except iron tailings and time iron ore concentrate.
Remove iron tailings by described two sections and carry out three sections of high intensity magnetic separations.The object of three sections of high intensity magnetic separations is in order to remove the ore grinding processing gangue mineral obtaining that dissociates, further improve high intensity magnetic mineral grade, for flotation step provide high-quality to ore deposit raw material, high intensity magnetic mineral after three sections of strong magnetic obtains final ilmenite concentrate after flotation, flotation step comprises floating sulphur and the floating titanium step of carrying out successively, wherein, in order to improve the grade of final ilmenite concentrate, floating titanium step should adopt thick four smart flow processs, carries out one roughing and also will roughly select concentrate and obtain final ilmenite concentrate after selected through four times.
In order to reach optimization process effect of the present invention, the present invention also relevant parameter such as feed ore concentration of the design parameter to high intensity magnetic separation, spiral gravity treatment has carried out concrete selection and adjustment: generally in order to ensure the rate of recovery and to take into account the grade of concentrate simultaneously, coarse grain all may be selected to be 5000～10000 oersteds except one section of high intensity magnetic separation of iron tailings, the magnetic field intensity of three sections of high intensity magnetic separations except iron tailings and particulate; And take into account the rate of recovery in order to ensure the grade of concentrate simultaneously, the magnetic field intensity that particulate removes two sections of high intensity magnetic separations of iron tailings may be selected to be 2000～7000 oersteds.For weak magnetic olivine and the part plagioclase of effectively dishing out, reach the object that improves gravity concentrate grade, the feed ore concentration of controlling spiral gravity treatment is 25%～45%.In addition, in order to improve the liberation degree of minerals of ilmenite, and prevent that overground argillization from affecting next step flotation operation, can be 40%～60% by the mog control of the gravity concentrate after described ore grinding, here, mog refers to the fineness of ore milling product, generally represents with the mass fraction (%) that is less than 200 orders (being less than 0.074 millimeter) ore particle.
Adopt new technology of the present invention to reclaim low-grade ilmenite, can obtain TiO
2grade is greater than 15% flotation to ore deposit, adopts Fig. 1 flow process to improve more than 3%, highly beneficial to follow-up flotation operation, finally obtains TiO
2grade reaches more than 47% ilmenite concentrate, has reached economy, the low-grade ilmenite of high efficiente callback, and improves the object of the ilmenite concentrate rate of recovery.
Two kinds of flotation that flow process obtains of table 1 are to the mineral composition comparing result in ore deposit
| Technological process | Titanomagnetite | Ilmenite | Pyroxene | Olivine | Hornblend | Plagioclase |
| （%） | （%） | （%） | （%） | （%） | ||
| Fig. 1 flow process | 16.92 | 17.64 | 10.28 | 42.59 | 7.06 | 2.82 |
| Fig. 2 flow process | 10.72 | 27.49 | 11.33 | 38.54 | 4.41 | 2.79 |
In table 1, provide the comparing result to ore deposit composition for flotation that the technological process shown in Fig. 1 and technological process of the present invention obtain, can find out, after increasing spiral gravity treatment, not only improve larger to flotation to ore deposit grade, the olivine and the plagioclase content that affect lower step flotation are had to certain reduction simultaneously, contribute to next step flotation.
The cost analysis of two kinds of flow process floating agents of table 2
As seen from Table 2, two kinds of various reagent consumption amounts of flow process are suitable, adopt the average unit of Fig. 1 flow process for flotation to 34.29 yuan of ore deposit reagent costs, 382.68 yuan of unit ilmenite concentrate reagent costs, and the average unit of Fig. 2 flow process gives 34.26 yuan of ore deposit reagent costs for flotation, 230.23 yuan of unit ilmenite concentrate reagent costs, Ji Gai flow process unit ilmenite concentrate reagent cost is low 152.45 yuan compared with Fig. 1 flow process.
Table 3 ilmenite concentrate sorts cost analysis
As seen from Table 3,25.69 yuan of the average unit costs of employing Fig. 1 flow process unit raw ore, 1027.60 yuan of unit ilmenite concentrate costs, and adopt 21.36 yuan of the average unit costs of Fig. 2 flow process unit raw ore, 688.90 yuan of unit ilmenite concentrate costs, the more former flow process of new technological flow unit's ilmenite concentrate cost is low 338.70 yuan.
In sum, the beneficiation method of ilmenite of the present invention is applicable to low-grade ilmenite.Show through pilot production, adopt new technology of the present invention, for flotation give ore deposit TiO
2grade reaches more than 15%, has reduced olivine and the plagioclase content of the lower step flotation of impact, can ensure ilmenite concentrate quality (TiO
2grade reaches more than 47%) time improve the ilmenite concentrate rate of recovery, and floating agent cost, unit ilmenite concentrate cost reduce greatly, produced huge economic benefit.
Although specifically described the beneficiation method of ilmenite with reference to embodiments of the invention, those skilled in the art will appreciate that without departing from the spirit and scope of the present invention, can make various forms of changes to embodiment.
Claims (8)
1. a beneficiation method for low-grade ilmenite, is characterized in that, TiO in described low-grade ilmenite
2content is 2wt%～7wt%, and described beneficiation method comprises the steps:
Raw ore is carried out every slag processing;
Raw ore after slag is carried out to classification processing, obtain coarse-grained material and fine;
Described coarse-grained material and described fine are carried out respectively after one section of deironing, obtain coarse grain except iron tailings, particulate are except iron tailings and inferior iron ore concentrate;
Described coarse grain, except iron tailings carries out one section of high intensity magnetic separation, is obtained to high intensity magnetic mineral and mine tailing;
Described high intensity magnetic mineral is carried out to spiral gravity treatment, obtain gravity concentrate and mine tailing;
Described gravity concentrate is delivered to ore grinding processing;
Described particulate is except iron tailings is successively through one section of high intensity magnetic separation and two sections of high intensity magnetic separations, and the final high intensity magnetic mineral obtaining mixes with the gravity concentrate after described ore grinding and classification;
Defective bulk concentrate after classification is returned to ore grinding step and regrind, qualified bulk concentrate carries out two sections of deironing, obtains two sections except iron tailings and time iron ore concentrate;
Remove iron tailings by described two sections and carry out three sections of high intensity magnetic separations, the high intensity magnetic mineral of acquisition obtains final ilmenite concentrate after flotation.
2. the beneficiation method of low-grade ilmenite according to claim 1, it is characterized in that, comprise that in described spiral gravity treatment step the high intensity magnetic mineral that described one section of high intensity magnetic separation is obtained carries out spiral and roughly selects, obtain qualified gravity concentrate, chats and mine tailing, wherein, described chats scans to obtain qualified gravity concentrate through spiral again.
3. the beneficiation method of low-grade ilmenite according to claim 1, it is characterized in that, described flotation step comprises floating sulphur and the floating titanium step of carrying out successively, and wherein, described floating titanium step comprises that roughly selecting and will roughly select concentrate obtains final ilmenite concentrate after selected through four times.
4. the beneficiation method of low-grade ilmenite according to claim 1, is characterized in that, described after slag the granularity for the raw ore of classification processing be not more than 2mm.
5. the beneficiation method of low-grade ilmenite according to claim 1, it is characterized in that, described coarse grain is except iron tailings and particulate removes one section of high intensity magnetic separation of iron tailings, the magnetic field intensity of three sections of high intensity magnetic separations is 5000～10000 oersteds, and the magnetic field intensity that described particulate removes two sections of high intensity magnetic separations of iron tailings is 2000～7000 oersteds.
6. the beneficiation method of low-grade ilmenite according to claim 1, is characterized in that, the feed ore concentration of described spiral gravity treatment is 25wt%～45wt%.
7. the beneficiation method of low-grade ilmenite according to claim 1, is characterized in that, is 40%～60% by the mog control of the gravity concentrate after described ore grinding.
8. the beneficiation method of low-grade ilmenite according to claim 1, is characterized in that, the granularity of described coarse-grained material is greater than 0.154mm, and the granularity of described fine is not more than 0.154mm.
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