CN101757986B - Method for floating bauxite - Google Patents

Method for floating bauxite Download PDF

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Publication number
CN101757986B
CN101757986B CN 200910243351 CN200910243351A CN101757986B CN 101757986 B CN101757986 B CN 101757986B CN 200910243351 CN200910243351 CN 200910243351 CN 200910243351 A CN200910243351 A CN 200910243351A CN 101757986 B CN101757986 B CN 101757986B
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concentrate
froth
ore
pulp
foam
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CN101757986A (en
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陈湘清
周杰强
陈兴华
陈占华
马俊伟
张建强
郭鑫
胡秋云
李花霞
闫琨
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Aluminum Corp of China Ltd
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Aluminum Corp of China Ltd
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Abstract

The invention relates to a method for floating bauxite, which is characterized in that: a froth product of grinding and rough concentration enters a pulp filtering tank and the enriched mineralized froth floats on the surface of ore pulp and overflows from the overflow opening of the pulp filtering tank to give a concentrate I; the defrothed impure ore pulp flows downwards, bottom-flow ore pulp enters a concentrating and floating tank under the action of a slag pulp pump, and a froth product of the concentration is used as a concentrate II; the bottom flow of the concentration returns to rough concentration operation, the bottom flow of the rough concentration is scavenged, the froth of the scavenged returns to the rough concentration operation, and the bottom flow of the scavenging is used as tailings; and the concentrate I and the concentrate II are combined to form the final concentrate. The method of the invention effectively solves the froth transport problem, stabilizes the ore pressure of the ore pulp feed and the floatation process, reduces the water consumption of the floatation system, improves floatation concentration, reduces the floatation time of qualified concentrate, improves equipment capacity, improves ore dressing indexes, reduces production cost and provides qualified bauxite concentrate material for the Bayer-process production of alumina.

Description

A kind of bauxite floating method
Technical field
A kind of bauxite floating method relates to a kind of method to bauxite floatation desilication.
Background technology
China's bauxite reserves are abundant, but 80% be in low-grade diaspore type bauxite, can not directly adopt the bayer process of economical and efficient to produce aluminium oxide, need to improve the bauxite aluminium-silicon ratio through pre-desiliconizing.Along with the high speed development of aluminium industry, cause the high-quality bauxite resource sharply to reduce, flotation desilication becomes more and more important as effective, the most economic method for desilication.The grade of ore descends, and the technique of ore dressing is variation immediately, and the advantage of the direct-flotation desiliconisation technology of bauxite is also more obvious, but float-amount is large, foam viscosity greatly still is its feature.
That is studying now and promoting gradually mainly adopts pump and gases at high pressure to strengthen gas-liquid mixed without transmission floatation process technology, high turbulent condition mineralising, low turbulent condition sorting have been realized, strengthened the particulate mineralising, mineralising is effective, reduce mixing and the interference of concentrate and tailings, greatly improved the efficiency of separation.Therefore, this kind equipment accommodation is extensive, sorting thick, fine all is fit to, coarse grain is carried out quick collecting, simultaneously can strengthen the collecting fine mineral, in addition little, the small investment of energy-conservation (energy-conservation 30%), dosing few (collector dosage reduces by 30%), floor space and advantages of simple structure and simple.
Because the bauxite forward flotation foam is many, and more sticking, to cross the slurry bucket through one because roughly select foam, then enter by the slag stock pump selected, in order to guarantee floatation concentration, control washing water quantity, may cause the transmission of foam not smooth, comprise that the foam delivery pump is easy to occur the not even situation such as dnockout of " cavitation erosion ", inefficiency, thereby the ore deposit pressure and the flow process that affects pan feeding be stablized, affect separation index, foam occurs roughly selecting and transmit insoluble problem.
Summary of the invention
The objective of the invention is the deficiency for above-mentioned prior art existence, provide a kind of and can effectively solve the problems such as bauxite flotation froth transmits, pan feeding slag stock pump efficient is low, effectively stablize the pan feeding ore deposit and press, shorten flotation process, improve the bauxite floating method of mineral processing index.
The objective of the invention is to be achieved through the following technical solutions.
A kind of bauxite floating method, the processing step of its floatation process comprises: ore grinding, classification, flotation, it is characterized in that after the ore pulp behind the ore grinding and floating agent effect, entering and roughly select, the froth pulp of roughly selecting entered stock tank, at the high-grade mineralized froth that obtains the postdigestive more low-grade ore pulp of foam segment under the shower water effect and disappear through the difficulty after the enrichment, mineralized froth after enrichment floats on above the ore pulp, and overflowing from the overfall of crossing stock tank becomes concentrate I; Be mingled with froth breaking after ore pulp toward current downflow, the underflow ore pulp enters selected flotation cell by the slag stock pump, selected froth pulp is as concentrate II; Selected underflow returns roughly selects operation, roughly selects underflow and enters and scan, and scans foam and returns and roughly select operation, scans underflow as mine tailing; Concentrate I, concentrate II merge into final concentrate.
A kind of bauxite floating method of the present invention, it is characterized in that the froth pulp roughly selected to cross stock tank be the container that contains simultaneously overfall, foam collecting tank, underflow pipe, crossing stock tank is column type, inverted conical type or square cell body, foam overflow mode after enrichment is that foam is from overflowing, or scraping foam by float skimming device, the overfall of crossing stock tank overflows part as concentrate I.
A kind of bauxite floating method of the present invention is characterized in that being provided with spray water system above the stock tank, sprayed shape and sprayed and roughly select on the foam so that water can be at the whole area of crossing stock tank top, washed and was mingled with and further enrichment roughly selecting foam.
Method of the present invention, can effectively solve the foam transmission problem, solve the not even problem such as dnockout of " cavitation erosion " that the foam delivery pump occurs, inefficiency, stablizing the ore deposit of ore pulp pan feeding presses, stablize flotation flowsheet, reduce the water content consumption of flotation system, improve floatation concentration, reduce the flotation time of qualified concentrate containing, improve equipment capacity, improve mineral processing index, reduce production costs, for alumina producing Bayer process provides the bauxite concentrate raw material of qualified grade, for efficiently utilizing new approach of low alumina-silicon ratio alumyte Resource Supply in China.
Description of drawings
Fig. 1 is the process chart of the inventive method;
Fig. 2 be stock tank totally show structural representation;
Fig. 3 was the partial schematic diagram of stock tank;
Fig. 4 was the partial schematic diagram of stock tank.
Table 10 has indicated the title of crossing the stock tank all parts.
The specific embodiment
A kind of bauxite floating method, the bauxite raw ore enters the primary grinding machine and roughly grinds, mog for-when 0.074mm accounts for 50%-80%, the ore grinding product through with the floating agent effect after enter into floatation equipment and roughly select, the froth pulp of roughly selecting entered stock tank, at the high-grade mineralized froth that obtains the postdigestive more low-grade ore pulp of foam segment under a certain amount of shower water effect and disappear through the difficulty after the enrichment, mineralized froth after enrichment floats on above the ore pulp, and overflowing from the overfall of crossing stock tank becomes concentrate I; Be mingled with froth breaking after ore pulp toward current downflow, the underflow ore pulp enters selected flotation cell by the slag stock pump, selected froth pulp is as concentrate II; Selected underflow returns roughly selects operation, and the underflow of roughly selecting enters the high-effective classifying equipment, and coarse fraction enters two sections open-circuit grindings, and the ore grinding product returns to be roughly selected; Fine fraction enters scans operation, scans foam and returns and roughly select operation, scans underflow as mine tailing; Concentrate I, concentrate II merge into final concentrate.
Embodiment 1
Take the low-grade bauxite of Henan A/S<3 as the test sample ore, raw ore main chemical compositions and phase composition see Table respectively 1, table 2.The principle process chart is seen accompanying drawing 1, and the concrete technology of its desiliconization is as follows:
The Henan low-grade bauxite exists with the treating capacity of 2t/h Grate ball mill in carry out ore grinding, add an amount of sodium carbonate dispersant in the grinding machine, the mog of the ore grinding product that obtains accounts for 78.6% for-0.074mm, the ore grinding product namely is that classifier overflow enters the raw ore slurry agitator and is driven into flotation cell without transmission by the slag stock pump roughly selects after comprising the collecting agent effect of 80g/t adjusting agent 400g/t with floating agent, the froth pulp of roughly selecting entered stock tank, at the high-grade mineralized froth that obtains the postdigestive more low-grade ore pulp of foam segment under a certain amount of shower water effect and disappear through the difficulty after the enrichment, mineralized froth after enrichment floats on above the ore pulp, and overflowing from the overfall of crossing stock tank becomes concentrate I; Be mingled with froth breaking after ore pulp toward current downflow, the underflow ore pulp enters selected flotation cell by the slag stock pump, selected froth pulp is as concentrate II; Selected underflow returns roughly selects operation; The underflow of roughly selecting enters Cyclone classification, hydrocyclone sand (fineness for-0.074mm account for 41.0%) enters two sections open-circuit grindings, ore grinding product (fineness for-0.074mm account for 75.0%) returns and roughly selects; Cyclone overflow (fineness for-0.074mm greater than 95%) enters and scans agitator, through with the collecting agent effect of 300g/t after squeeze into flotation cell without transmission by the slag stock pump and scan, scan foam and return and roughly select operation, scan underflow as mine tailing; Concentrate I, concentrate II merge into final concentrate.Its ore dressing and desiliconizing the results are shown in Table 3.
Table 1 raw ore chemical composition complete analysis (%)
The content of essential mineral (%) in table 2 raw ore
Table 3 ore dressing and desiliconizing result
Embodiment 2
Being about 4.2 low-grade bauxite take Henan A/S is the test sample ore, and raw ore main chemical compositions and phase composition see Table respectively 4, table 5.The principle process chart is seen accompanying drawing 1, and the concrete technology of its desiliconization is as follows:
The Henan low-grade bauxite exists with the treating capacity of 80t/h Rod mill in carry out ore grinding, add an amount of sodium carbonate dispersant in the grinding machine, the mog of the ore grinding product that obtains accounts for 67.5% for-0.074mm, the ore grinding product namely is that classifier overflow enters the raw ore slurry agitator and is driven into flotation cell without transmission by the slag stock pump roughly selects after comprising the collecting agent effect of 80g/t adjusting agent 450g/t with floating agent, the froth pulp of roughly selecting entered stock tank, at the high-grade mineralized froth that obtains the postdigestive more low-grade ore pulp of foam segment under a certain amount of shower water effect and disappear through the difficulty after the enrichment, mineralized froth after enrichment floats on above the ore pulp, and overflowing from the overfall of crossing stock tank becomes concentrate I; Be mingled with froth breaking after ore pulp toward current downflow, the underflow ore pulp enters selected flotation cell by the slag stock pump, selected froth pulp is as concentrate II; Selected underflow returns roughly selects operation; The underflow of roughly selecting enters 1170 * 1670 dither sieve classifications, and part (fineness for-0.074mm account for 28.0%) enters two sections open-circuit grindings on the sieve, and ore grinding product (fineness for-0.074mm account for 68.6%) returns and roughly selects; The lower part of screen divides (fineness for-0.074mm greater than 98%) to enter and scan agitator, through with the collecting agent effect of 200g/t after squeeze into flotation cell without transmission by the slag stock pump and scan, scan foam and return and roughly select operation, scan underflow as mine tailing; Concentrate I, concentrate II merge into final concentrate.Its ore dressing and desiliconizing the results are shown in Table 6.
Table 4 raw ore chemical composition complete analysis (%)
The content of essential mineral (%) in table 5 raw ore
Table 6 ore dressing and desiliconizing result
Embodiment 3
Being about 5.7 low-grade bauxite take Shanxi south A/S is the test sample ore, and raw ore main chemical compositions and phase composition see Table respectively 7, table 8.The principle process chart is seen accompanying drawing 1, and the concrete technology of its desiliconization is as follows:
The Henan low-grade bauxite exists with the treating capacity of 2.1t/h Grate ball mill in carry out ore grinding, add an amount of sodium carbonate dispersant in the grinding machine, the mog of the ore grinding product that obtains accounts for 56.8% for-0.074mm, the ore grinding product namely is that classifier overflow enters the raw ore slurry agitator and is driven into flotation cell without transmission by the slag stock pump roughly selects after comprising the collecting agent effect of 80g/t adjusting agent 300g/t with floating agent, the froth pulp of roughly selecting entered stock tank, at the high-grade mineralized froth that obtains the postdigestive more low-grade ore pulp of foam segment under a certain amount of shower water effect and disappear through the difficulty after the enrichment, mineralized froth after enrichment floats on above the ore pulp, and overflowing from the overfall of crossing stock tank becomes concentrate I; Be mingled with froth breaking after ore pulp toward current downflow, the underflow ore pulp enters selected flotation cell by the slag stock pump, selected froth pulp is as concentrate II; Selected underflow returns roughly selects operation; The underflow of roughly selecting enters Cyclone classification, hydrocyclone sand (fineness for-0.074mm account for 30.8%) enters two sections open-circuit grindings, ore grinding product (fineness for-0.074mm account for 71.0%) returns and roughly selects; Cyclone overflow (fineness for-0.074mm greater than 95%) enters and scans agitator, through with the collecting agent effect of 200g/t after squeeze into flotation cell without transmission by the slag stock pump and scan, scan foam and return and roughly select operation, scan underflow as mine tailing; Concentrate I, concentrate II merge into final concentrate.Its ore dressing and desiliconizing the results are shown in Table 9.
Table 7 raw ore chemical composition complete analysis (%)
The content of essential mineral (%) in table 8 raw ore
Table 9 ore dressing and desiliconizing result
Table 10
Sequence number Title
1 Cross stock tank
2 Scrape the bubble machine
3 Foam collecting tank
4 Charging aperture
5 Underflow opening
6 The foam overfall
7 Cross the stock tank top cover
8 Mouth spray
9 Foam baffle
10 The A-A section

Claims (3)

1. bauxite floating method, the processing step of its floatation process comprises: ore grinding, classification, flotation, it is characterized in that after the ore pulp behind the grind grading and floating agent effect, entering and roughly select, the froth pulp of roughly selecting entered stock tank, at the high-grade mineralized froth that obtains the postdigestive more low-grade ore pulp of foam segment under the shower water effect and disappear through the difficulty after the enrichment, mineralized froth after enrichment floats on above the ore pulp, and overflowing from the overfall of crossing stock tank becomes concentrate I; Be mingled with froth breaking after ore pulp toward current downflow, the underflow ore pulp enters selected flotation cell by the slag stock pump, selected froth pulp is as concentrate II; Selected underflow returns roughly selects operation, roughly selects underflow and enters and scan, and scans foam and returns and roughly select operation, scans underflow as mine tailing; Concentrate I, concentrate II merge into final concentrate.
2. a kind of bauxite floating method according to claim 1, it is characterized in that the froth pulp roughly selected to cross stock tank be the container that contains simultaneously overfall, foam collecting tank, underflow pipe, crossing stock tank is column type, inverted conical type or square cell body, foam overflow mode after enrichment is that foam is from overflowing, or scraping foam by float skimming device, the overfall of crossing stock tank overflows part as concentrate I.
3. a kind of bauxite floating method according to claim 1, it is characterized in that being provided with above the stock tank spray water system, spray shape and spray and roughly select on the foam so that water can be at the whole area of crossing stock tank top, wash and be mingled with and further enrichment roughly selecting foam.
CN 200910243351 2009-12-18 2009-12-18 Method for floating bauxite Active CN101757986B (en)

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Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102205275A (en) * 2011-05-18 2011-10-05 昆明理工大学 Reinforced floatation desilicification method for high-silicon bauxite
CN102489411B (en) * 2011-12-26 2013-11-27 昆明理工大学 Flotation two-stage desiliconization method for high-silicon bauxite
CN102806146A (en) * 2012-07-27 2012-12-05 中国铝业股份有限公司 Method for performing beneficiation and desilicification on bauxite
CN103285625B (en) * 2013-06-13 2015-08-26 北京矿冶研究总院 A kind of debubbling method of phosphate reverse flotation desiliconization
CN103521363B (en) * 2013-10-19 2016-06-22 李耀吾 Low-grade bauxite raw ore open-circuit grinding ore-dressing technique
CN104841567A (en) * 2015-06-08 2015-08-19 河南东大矿业股份有限公司 Flow mixing method for bauxite forward flotation
CN107051711B (en) * 2017-04-10 2019-09-13 中国铝业股份有限公司 A kind of method that mineral processing tailing of bauxite selects again

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB563045A (en) * 1941-10-21 1944-07-27 American Cyanamid Co Improvements in bauxite beneficiation
US3990965A (en) * 1973-11-29 1976-11-09 Femipari Kutato Intezet Flotation process for the enrichment of bauxites
CN1393292A (en) * 2001-06-29 2003-01-29 中南大学 Dressing process for desiliconizing bauxite with medium or low Al/Si ratio
CN1441705A (en) * 2000-02-15 2003-09-10 纽卡塞尔大学研究合伙有限公司 Improved froth flotation process and apparatus
CN1579638A (en) * 2004-05-20 2005-02-16 沈阳铝镁设计研究院 Washup-flotation process for stacked bauxite
CN101417268A (en) * 2008-11-26 2009-04-29 昆明有色冶金设计研究院 A kind of dressing process for desiliconizing of bauxite

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB563045A (en) * 1941-10-21 1944-07-27 American Cyanamid Co Improvements in bauxite beneficiation
US3990965A (en) * 1973-11-29 1976-11-09 Femipari Kutato Intezet Flotation process for the enrichment of bauxites
CN1441705A (en) * 2000-02-15 2003-09-10 纽卡塞尔大学研究合伙有限公司 Improved froth flotation process and apparatus
CN1393292A (en) * 2001-06-29 2003-01-29 中南大学 Dressing process for desiliconizing bauxite with medium or low Al/Si ratio
CN1579638A (en) * 2004-05-20 2005-02-16 沈阳铝镁设计研究院 Washup-flotation process for stacked bauxite
CN101417268A (en) * 2008-11-26 2009-04-29 昆明有色冶金设计研究院 A kind of dressing process for desiliconizing of bauxite

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