CN1125777C - Dressing process for desiliconizing bauxite with medium or low Al/Si ratio - Google Patents
Dressing process for desiliconizing bauxite with medium or low Al/Si ratio Download PDFInfo
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- CN1125777C CN1125777C CN 01114566 CN01114566A CN1125777C CN 1125777 C CN1125777 C CN 1125777C CN 01114566 CN01114566 CN 01114566 CN 01114566 A CN01114566 A CN 01114566A CN 1125777 C CN1125777 C CN 1125777C
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Abstract
The present invention relates to a dressing method for desiliconizing bauxite with a medium or low Al/Si ratio. Bauxite ores are ground to have proper fineness and are graded into 1 to 2 coarse particle grades and fine particle grades, the coarse particle grade is completely or partially ore concentrate 1, a flotation agent is added in the fine particle grade for flotation so as to obtain floatation concentrate as ore concentrate 2, the ore concentrate 1 and the ore concentrate 2 are combined as ore concentrate for bauxite ore dressing, tailings are respectively generated in coarse scavenger flotation circulation and fine concentration circulation in floatation processes, and the tailings are used as ore dressing tailings for the bauxite ores. The processes of the present invention can assure that the ore concentrate fineness satisfies the requirements of alumina production, the consumption of the floatation operation agent is reduced by more than 30%, and the processing capacity of the flotation operation is increased by more than 30%. Therefore, the present invention has the advantages of good Al/Si separation effect, stable production process, simple technique and obvious economic benefit.
Description
The present invention relates to the dressing process for desiliconizing that alumina silica ratio is the middle low alumina-silicon ratio alumyte of 4-7.
In the industrial application of bauxite, often require the alumina silica ratio of bauxite to reach certain value.Especially in alumina producing, efficient low-consume, the simple bayer process general requirement of technology alumina silica ratio are greater than 10.For diaspore type bauxite, most alumina silica ratios are less than 10, thereby have limited the industrial application economically and reasonably of this class bauxite.Ore dressing and desiliconizing, especially flotation desilication are one of cost-effective methods that improves the bauxite aluminium-silicon ratio.
At present, the flotation desilication of diaspore type bauxite, be with bauxite the whole materials after levigate through flotation desilication, the flotation concentrate that obtains is the qualified concentrate containing of ore dressing and desiliconizing, siliceous mineral removed two kinds of methods, a kind of is that flotation tailings is that true tailings abandons, and another kind is that flotation tailings (or claiming chats) carries out classification, and the fine fraction of telling returns ore grinding and regrinds as true tailings, coarse fraction.
The qualified beneficiation concentrate that is used for alumina producing not only requires the alumina silica ratio of concentrate to meet the demands, and requires granularity of concentrate thick.
In present direct flotation process, coarse fraction diaspore especially its intergrowth difficulty floats, easily falls groove.In order to guarantee that granularity of concentrate is thick, have to take measures to strengthen coarsely graded recovery from increasing collector dosage and flotation tailings aspect such as regrind.Consequently, organic content height in the medicine of flotation consumption height, the concentrate, technical process complexity, technological process are difficult to stablize, and the fluctuation of flotation concentrate fineness is big.
Simultaneously, in the direct flotation process, the flotability of main siliceous mineral is relatively poor, and the coarse grain silicon mine is substantially floating, and coarse grain silicon mine and rich intergrowth thereof are generally stayed slightly, finally enter flotation tailings in the scavenger flotation cell.But because siliceous mineral hardness is low, most of siliceous mineral is a fine fraction in the ore milling product, is easy to be carried secretly come-up by foam, makes in the cleaner tailings fine fraction based on gangue.In present direct flotation process, with the cleaner tailings Returning process, this makes the siliceous gangue of particulate Returning process again, and the siliceous gangue of particulate disturbs flotation, aluminium, the isolating selectivity variation of silicon.Bring a large amount of water into flow process simultaneously, cause to roughly select concentration and scan concentration and reduce greatly, the result increases throughput reduction, the flotation reagent consumption of floatation indicators deterioration, flotation operation.If flotation tailings is (or claim chats) classification again, the fine fraction of telling as true tailings abandon, coarse fraction returns ore grinding and regrinds, and also causes the overground of coarse grain siliceous mineral, the mine tailing fineness is thinner.
In the bauxite flotation desiliconization process, can not reclaim coarse fraction diaspore and intergrowth thereof in order to overcome prior art timely and effectively, can not in time remove fine fraction and coarse fraction siliceous mineral, cause the fluctuation of flotation concentrate fineness big, organic content height in flotation medicine consumption height, the concentrate, technical process complexity, technological process are difficult to stablize, shortcomings such as flotation operation throughput is low, special proposition the present invention.
Because the main valuable mineral diaspore in the bauxite, bigger with the nonhomogeneous hardness of main siliceous mineral such as kaolinite, illite, agalmatolite, Mohs' hardness is respectively: diaspore 6-7, kaolinite 1-3, illite 1-2, agalmatolite 1-2.Therefore, the difficult relatively comminution of diaspore makes the aluminium of size fractionated in the bauxite comminution product, the distribution of silicon have selectivity, Al
2O
3Enrichment relatively in the coarse fraction of comminution product, SiO
2Enrichment relatively in fine fraction.
The selectivity that the present invention utilizes bauxite to exist in comminution process and direct flotation process, the one, with selectivity comminution product be divided into slightly, fine fraction, handle respectively: fine fraction enters the flotation flowsheet desiliconization, obtains flotation concentrate, coarse fraction directly and flotation concentrate merge into qualified concentrate containing; The 2nd, in fine fraction flotation desilication flow process, flotation flowsheet is divided into coarse scan choosing circulation and selected circulation output mine tailing and lose tail respectively, selected circulation comprises carries out the selected acquisition flotation concentrate of one or many to roughly selecting concentrate, and the mine tailing to selected 1 carries out one or many and scans the selected round-robin mine tailing of (being called essence scans) acquisition.
The present invention is achieved by the following technical solutions.
Carry out classification after bauxite is milled to suitable fineness, be divided into 1-2 coarse particles and fine particles, coarse fraction is all or part of to be concentrate 1, fine fraction adds flotation reagent and carries out flotation, the flotation concentrate that obtains is a concentrate 2, concentrate 1 and concentrate 2 are merged into the ore concentration of bauxite concentrate, and floatation process is from coarse scan choosing circulation and selected circulation difference output mine tailing, as bauxite.
The levigate method of bauxite can be that the fineness that comminution requires to reach is decided on the alternative comminution character of alum clay sample ore with to the requirement of beneficiation concentrate product with one or more the selectivity comminutions that carry out in small, broken bits, ball milling, rod milling, special-shaped medium ore grinding, gravel mill, autogenous grinding, the method such as Semi-Autogenous.
The qualified product of selectivity comminution are carried out classification, tell 1-2 coarse particles and fine particles, fractionated granularity boundary is decided on coarsely graded alumina silica ratio, and stage division can be one or more in the methods such as screening, screw classifier classification, hydroclone classification, hydraulic classification.The processing mode of telling 1-2 coarse particles is, the coarse fraction of telling all incorporates concentrate into or the thickest rank is regrinded, and thick rank is different goes into concentrate.
Fine-graded floatation process is divided into coarse scan choosing circulation and selected circulation, and coarse scan selects round-robin mine tailing and selected round-robin mine tailing to merge into bauxite.
The present invention is suitable for handling the diaspore type bauxite that alumina silica ratio is 4-7.
Utilize the present invention, can guarantee fully that the concentrate fineness satisfies the requirement of alumina producing, in the bauxite flotation desiliconization process, can reclaim coarse fraction diaspore and intergrowth thereof timely and effectively, can in time remove fine fraction and coarse fraction siliceous mineral, the flotation concentrate fineness is stable, flotation medicine consumption is low, organic content is low in the concentrate, technical process is simple, stable technical process, flotation operation throughput height, compared with prior art, the present invention makes the medicine depletion of flotation operation few more than 30%, the processing power of flotation operation improves more than 30%, and aluminium silicon is isolating effective, and production process is easily stable, technology is simple, remarkable in economical benefits.
Below in conjunction with embodiment method of the present invention is described further.
Embodiment 1:
Raw material: the comprehensive sample ore 1 in Henan bauxite district, its main chemical compositions is:
| Al 2O 3(％) | SiO 2(％) | Alumina silica ratio (A/S) |
| 63.2-64.8 average 63.8 | 9.70-10.51 average 10.12 | 6.01-6.81 average 6.29 |
Flowage structure: Φ 1500 * 1500 grate discharge ball mills and Φ 1000 high weir type single-spiral classifiers constitute one section closed circuit grinding, its qualified product are divided into coarse fraction and fine fraction with screw classifier, add spray water to improve fractional efficiency more than the negative area of screw classifier to the interval below the sand return mouth; Coarse fraction is concentrate I, and fine fraction enters flotation, and flotation concentrate is concentrate II, and concentrate I and concentrate II merge into final concentrate.The fine fraction flotation is divided into coarse scan choosing circulation and selected circulation, the coarse scan choosing circulate for roughly select, once purging selection, scan foam and return and roughly select, scanning mine tailing is mine tailing 1; Selected circulation is that twice selected once essence scanned, and the mine tailing of selected II returns selected I, and the mine tailing of selected I enters essence and scans, and it is mine tailing 2 that essence is scanned mine tailing, and essence is scanned foam and returned selected I, and mine tailing 1 and mine tailing 2 are merged into true tailings.
Main technical details:
Treatment capacity: 60-65 ton per day THE INDUSTRIAL TRIAL;
One section closed circuit grinding of ball milling, grinding fineness accounts for 60-85% for-0.075mm; Flotation is selected in fineness-0.075mm and accounts for 75-100%;
Dosing: yellow soda ash 3200-3800 gram/ton, collecting agent 900-1150 gram/ton, adjustment agent 120-220 gram/ton.
Sorting index: 115.3 hours working times, handle 306.0 tons of ore deposit amounts, concentrate average index: Al
2O
369.12%, SiO
25.62%, A/S is 12.30, concentrate yield 80.36%, concentrate Al
2O
3The rate of recovery 87.05%, concentrate fineness-0.075mm 69.37%; Average grinding fineness-0.075mm 71.96%.
Embodiment 2:
Raw material: the comprehensive sample ore 2 in Henan bauxite district, its main chemical compositions is:
| Al 2O 3(％) | SiO 2(％) | Alumina silica ratio (A/S) |
| 62.10-62.20 average 62.17 | 10.51-11.59 average 10.91 | 5.36-5.92 average 5.70 |
All the other are with embodiment 1.
Sorting index: 24 hours working times, handle 62.85 tons of ore deposit amounts; Concentrate average index: Al
2O
368.50%, SiO
26.36%, A/S is 10.77, concentrate yield 78.35%, concentrate Al
2O
3The rate of recovery 86.33%, concentrate fineness-0.075mm 70.43%; Average grinding fineness-0.075mm 69.99%.
Embodiment 3:
Raw material: the comprehensive sample ore 1 in Henan bauxite district, its main chemical compositions is:
| Al 2O 3(％) | SiO 2(％) | Fe 2O 3(％) | Alumina silica ratio (A/S) |
| 64.69 | 11.39 | 4.93 | 5.68 |
Grinding media: short rod iron.
Flow process is: ore grinding to fineness accounts for 70% for-0.074mm, adopts 0.25mm sieve and 0.074mm to sieve sieve classification, and-0.074mm grade is carried out flotation, obtain concentrate 2,-0.25+0.074mm grade is a concentrate 1, and concentrate 1 is merged into qualified concentrate containing with concentrate 2, and+0.25mm grade is returned ore grinding and regrinded.
The medicament that the fine fraction flotation is adopted: wherein a kind of of oxidation paraffin wax soap, tall oil, lipid acid and soap class and derivative etc. or several are made collecting agent, and wherein a kind of such as yellow soda ash, sodium hydroxide, polyphosphoric acid salt, water glass, small organic molecule or several adjust agent.
The flow process that the fine fraction flotation is adopted: coarse scan choosing circulation is one roughing, once purging selection, scans foam and returns and roughly select, and scanning mine tailing is mine tailing 1; Selected circulation is that twice selected back output flotation concentrate is concentrate 2, and the mine tailing of selected II returns selected I, and the mine tailing of selected I is a mine tailing 2; Mine tailing 1 and mine tailing 2 are merged into true tailings.
The closed circuit following table that the results are shown in of ore dressing and desiliconizing:
Embodiment 4: raw material: the comprehensive sample ore 1 in alum clay mining area, Shanxi, and its main chemical compositions is:
| Name of product | Alumina silica ratio (A/S) | Al 2O 3The rate of recovery (%) | The concentrate fineness (0.074mm%) |
| Concentrate 1 concentrate 2 merges concentrate | 9.38 14.16 12.28 | 26.96 63.38 90.34 | 69.88 |
| Mine tailing 1 mine tailing 2 merges mine tailing | 0.88 1.01 0.94 | 4.42 5.24 9.66 |
| Al 2O 3(％) | SiO 2(％) | Fe 2O 3(％) | Alumina silica ratio (A/S) |
| 60.34 | 13.47 | 4.71 | 4.48 |
Grinding media: porcelain ball
Flow process is: ore grinding to fineness accounts for 68% for-0.074mm, adopts the 0.10mm sieve classification, and-0.10mm grade is carried out flotation, obtains concentrate 2, and+0.10mm grade is a concentrate 1, and concentrate 1 is merged into qualified concentrate containing with concentrate 2.
The fine fraction flotation adopts flow process and medicament with embodiment 3.
The closed circuit following table that the results are shown in of ore dressing and desiliconizing:
| Name of product | Alumina silica ratio (A/S) | Al 2O 3The rate of recovery (%) | The concentrate fineness (0.074mm%) |
| Concentrate 1 concentrate 2 merges concentrate | 6.15 13.22 10.08 | 23.13 62.08 85.21 | 61.67 |
| Mine tailing 1 mine tailing 2 merges mine tailing | 0.90 1.19 1.07 | 5.23 9.56 14.79 |
Claims (6)
1. the dressing process for desiliconizing of low alumina-silicon ratio alumyte in a kind, comprise grinde ore, classification and flotation, it is characterized in that: carry out classification after bauxite is milled to release mesh, be divided into 1-2 coarse particles and fine particles, coarse fraction is all or part of to be concentrate 1, fine fraction adds flotation reagent and carries out flotation, the flotation concentrate that obtains is a concentrate 2, concentrate 1 and concentrate 2 are merged into the ore concentration of bauxite concentrate, floatation process is from coarse scan choosing circulation and selected circulation difference output mine tailing, as bauxite.
2. dressing process for desiliconizing according to claim 1, it is characterized in that: the comminution method of bauxite can be that the fineness that comminution requires to reach is decided on the alternative comminution character of alum clay sample ore with to the requirement of beneficiation concentrate product with one or more the selectivity comminutions that carry out in small, broken bits, ball milling, rod milling, special-shaped medium ore grinding, gravel mill, autogenous grinding, the method such as Semi-Autogenous.
3. dressing process for desiliconizing according to claim 1, it is characterized in that: the qualified product to the selectivity comminution carry out classification, stage division can be one or more in the methods such as sieve classification, screw classifier classification, hydroclone classification, hydraulic classification, and fractionated granularity boundary is decided on coarsely graded alumina silica ratio with to the requirement of beneficiation concentrate product granularity.
4. dressing process for desiliconizing according to claim 1, it is characterized in that: the processing mode of carrying out 1-2 that classification is told coarse particles after selective bauxite is levigate is, the coarse fraction of telling all incorporates concentrate into or the thickest rank is regrinded, and thick rank is incorporated concentrate into.
5. dressing process for desiliconizing according to claim 1 is characterized in that: fine-graded floatation process is divided into coarse scan choosing circulation and selected circulation, and coarse scan selects round-robin mine tailing and selected round-robin mine tailing to merge into bauxite.
6. dressing process for desiliconizing according to claim 1 is characterized in that: the present invention is suitable for handling the diaspore type bauxite that alumina silica ratio is 4-7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01114566 CN1125777C (en) | 2001-06-29 | 2001-06-29 | Dressing process for desiliconizing bauxite with medium or low Al/Si ratio |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01114566 CN1125777C (en) | 2001-06-29 | 2001-06-29 | Dressing process for desiliconizing bauxite with medium or low Al/Si ratio |
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|---|---|
| CN1393292A CN1393292A (en) | 2003-01-29 |
| CN1125777C true CN1125777C (en) | 2003-10-29 |
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Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100382894C (en) * | 2005-11-01 | 2008-04-23 | 中南大学 | Gradient floatation method for bauxite |
| CN100366346C (en) * | 2005-11-28 | 2008-02-06 | 中国铝业股份有限公司 | Bauxite separating method |
| CN100354045C (en) * | 2005-12-02 | 2007-12-12 | 中南大学 | Bauxite crude-fine grading flotation desilicification method |
| CN101757986B (en) * | 2009-12-18 | 2013-03-20 | 中国铝业股份有限公司 | Method for floating bauxite |
| CN101850297A (en) * | 2010-06-13 | 2010-10-06 | 中国铝业股份有限公司 | Method for mineral dressing and silicon removal of bauxite |
| CN106964479B (en) * | 2017-04-10 | 2019-01-15 | 中国铝业股份有限公司 | A kind of bauxite stage flotation desilication method |
| CN108554594B (en) * | 2018-05-14 | 2020-08-14 | 山东绿脉铝业科技有限公司 | Ore dressing method for low-grade bauxite |
| CN109201311A (en) * | 2018-08-14 | 2019-01-15 | 湖南埃铝环保科技有限公司 | A kind of high-sulphur alumyte desulfuration method |
| CN112501426B (en) * | 2020-11-12 | 2021-12-14 | 中南大学 | Method for separating micro-fine copper particles from lithium iron phosphate battery waste electrode powder |
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2001
- 2001-06-29 CN CN 01114566 patent/CN1125777C/en not_active Expired - Fee Related
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