CN103736600A - Method for desiliconizing bauxite - Google Patents
Method for desiliconizing bauxite Download PDFInfo
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- CN103736600A CN103736600A CN201310737941.9A CN201310737941A CN103736600A CN 103736600 A CN103736600 A CN 103736600A CN 201310737941 A CN201310737941 A CN 201310737941A CN 103736600 A CN103736600 A CN 103736600A
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Abstract
The invention aims to provide a bauxite desilication high-efficiency energy-saving short-flow technology, which is characterized in that part of low-grade fine mud influencing the flotation effect is removed from bauxite after selective flocculation, and then flotation is carried out, so that the effects of reducing the number of flotation stages, and having good reagent dosage and sorting index can be achieved.
Description
Technical field
The invention belongs to ore dressing field, relate to a kind of desilication method of bauxite.
Background technology
Aluminium is that in the earth's crust, to enrich degree be the 3rd element, it is one of metallic element the most often using in civilized society, because aluminium alloy has the corrosion resistance of height and good mechanical strength/mass ratio, be therefore widely used as the primary structure material of aircraft, building, machine part, beverage can and packaging for foodstuff.At present, bauxite is the primary raw material that aluminium oxide/aluminium is produced.The known bauxite reserves of China are about 2,300,000,000 t, occupy the 5th, the world.The feature different from the country of other processing bauxites, Chinese Bauxite Ore more than 98% has diaspore to exist, containing having an appointment 80% diaspore.Gangue mineral in China's bauxite is mainly kaolinite, pyrophillite and illite, and all the other are a small amount of titanium and iron tramps.The inclusion form that these gangue minerals are often contaminated with particulate exists.Undesirable feature of China's diaspore ore is low alumina-silica ratio, and typical scope is 4～6.
As everyone knows, Al
2o
3with SiO
2mass ratio is greater than 10 high grade bauxite can directly use Bayer process, and for Al
2o
3with SiO
2mass ratio is lower than 8 low grade diaspore bauxite, the method that can use sintering to combine with Bayer process.Sintering process energy consumption is very large, and environment is unfriendly, and alumina production cost is high, in the urgent need to adopting the physical separation technique of low expense to improve the Al of Chinese diaspore ore
2o
3mass ratio, to can directly use bayer process processing.Therefore selective flocculation+direct-flotation desiliconisation technique is the very promising bauxite desilication method of one.
Summary of the invention
The object of this invention is to provide the energy-efficient short flow process technology of a kind of bauxite desilication, make bauxite first after selective flocculation, remove a part and affect the low-grade thin mud of flotation effect, then carrying out flotation, can reach like this and reduce flotation hop count, dosing and the good effect of sorting index.
The present invention adopts following technical scheme:
For a method for bauxite desilication, it is characterized in that comprising the following steps:
Step 1,
Bauxite is placed to ball mill and grind, in the process of ore grinding, add sodium carbonate, addition is about 3000g/t, stops ore grinding after the bauxite be about-0.074mm that is milled to granularity is accounted for to 90%;
Step 2,
By adding running water in prepared ore deposit in step 1, make ore pulp, making pulp density is 10%;
Step 3,
To adding NaOH to regulate pH value in prepared ore pulp in step 2, be 10;
Step 4,
In prepared ore pulp in step 3, add water softener, in the process of interpolation, constantly stir, mixing speed is 1992r/min, and mixing time is 10 minutes, and described water softener is sodium polyphosphate, and its consumption is 5000g/t;
Step 5,
In prepared ore pulp in step 4, add flocculant, its consumption is 5g/t, in the process of interpolation, constantly stirs, and mixing speed is 400r/min, and mixing time is within 2 minutes, to make mixed liquor, and described flocculant is polyacrylamide 63016;
Step 6,
By obtained mixed liquor in step 5, quiescent settling 15 minutes, adopts the method for siphon to extract top suspension out, obtains rough concentrate;
Step 7,
In the prepared rough concentrate of step 6, add adjusting agent Na
2cO
33000g/t also stirs 3 minutes, then adds inhibitor ZM-260g/t and stirs 6 minutes, then adds collecting agent KM500g/t to stir 3 minutes, carrying out one section roughly selects, the flotation froth obtaining is flotation rough concentrate, and it is 8.50, Al that flotation rough concentrate is carried out obtaining alumina silica ratio after selected twice again
2o
3the rate of recovery is 72.14% concentrate, and in groove, product obtains final product from failing again after twice is scanned.While scanning required medicament kind with roughly select consistent.
Tool of the present invention has the following advantages:
Because China's bauxite resource is mainly middle poor value, mineral composition complexity, argillization is serious, expect that high-grade bauxite just need to carry out flotation processing, but single flotation flowsheet, and separating effect is often undesirable, and there is long flow path, the shortcoming that reagent consumption is many.Adopt selective flocculation+flotation flowsheet can get rid of the impact of sludge on flotation, reduce reagent consumption, improve concentrate grade, shorten flotation flowsheet.Process the bauxite that raw ore alumina silica ratio is 4.9, through three selective flocculation+mono-section flotation flowsheets, can be recycled rate is 73.58%, the bauxite concentrate that alumina silica ratio is 8.7.If without selective flocculation, directly carry out float test, need one section to roughly select+tetra-sections selected, its concentrate index is alumina silica ratio 8.02, the rate of recovery 63.25%.Patent of the present invention is a kind of energy-efficient short flow process technology of applicable bauxite as can be seen here.
The specific embodiment
It is below the example that adopts selective flocculation+direct floatation process flow process.
Adopt this method to select bauxite to carry out the test of selective flocculation+direct flotation, Al in these mineral to Shanxi low alumina-silica ratio difficulty
2o
3content is that 63.55%, SiO2 content is 12.88%, and alumina silica ratio is 4.93.
In ore, add the sodium carbonate of 3000g/t, be milled to-0.074mm90%, the ore pulp after levigate is poured in settling vat, regulating pulp density is 10%.(adding flocculant mixing speed is before 1992r/min after stirring 5min, to add flocculant 630163000g/t, adding the mixing speed after flocculant is 400r/min), quiescent settling 15min after stirring, adopt the method for siphon to extract top suspension out as mine tailing, according to aforesaid operations step, carry out continuously three selective flocculation tests.Then subsidence part is divided and pour flotation cell into and carry out flotation, add adjusting agent sodium carbonate 3000g/t, stir 3 minutes, then add inhibitor ZM-260g/t, stir 6 minutes, finally add collecting agent KM1200g/t, stir 3 minutes, start to inflate scraping foam 5 minutes, the froth bed of gained is bauxite concentrate, and its index reaches: Al
2o
3content is 69.32%, SiO
2content is 7.97%, and alumina silica ratio is 8.70.
Should be understood that these embodiment are only not used in and limit the scope of the invention for the present invention is described.In addition should be understood that those skilled in the art can make various changes or modifications the present invention after having read the content of the present invention's instruction, these equivalent form of values fall within the application's appended claims limited range equally.
Claims (1)
1. for a method for bauxite desilication, it is characterized in that comprising the following steps:
Step 1,
Bauxite is placed in ball mill and ground, in the process of ore grinding, add sodium carbonate, addition is about 3000g/t, stops ore grinding after the bauxite be about-0.074mm that is milled to granularity is accounted for to 90%;
Step 2,
By adding running water in prepared ore deposit in step 1, make ore pulp, making pulp density is 10%;
Step 3,
To adding NaOH to regulate pH value in prepared ore pulp in step 2, be 10;
Step 4,
In prepared ore pulp in step 3, add water softener, in the process of interpolation, constantly stir, mixing speed is 1992r/min, and mixing time is 10 minutes, and described water softener is sodium polyphosphate, and its consumption is 5000g/t;
Step 5,
In prepared ore pulp in step 4, add flocculant, its consumption is 5g/t, in the process of interpolation, constantly stirs, and mixing speed is 400r/min, and mixing time is within 2 minutes, to make mixed liquor, and described flocculant is polyacrylamide 63016;
Step 6,
By obtained mixed liquor in step 5, quiescent settling 15 minutes, adopts the method for siphon to extract top suspension out, obtains rough concentrate;
Step 7,
In the prepared rough concentrate of step 6, add adjusting agent Na
2cO
33000g/t also stirs 3 minutes, then adds inhibitor ZM-260g/t and stirs 6 minutes, then adds collecting agent KM500g/t to stir 3 minutes, carrying out one section roughly selects, the flotation froth obtaining is flotation rough concentrate, and it is 8.50, Al that flotation rough concentrate is carried out obtaining alumina silica ratio after selected twice again
2o
3the rate of recovery is 72.14% concentrate, and in groove, product obtains final product from failing again after twice is scanned.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310737941.9A CN103736600B (en) | 2013-12-30 | 2013-12-30 | Method for desiliconizing bauxite |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310737941.9A CN103736600B (en) | 2013-12-30 | 2013-12-30 | Method for desiliconizing bauxite |
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|---|---|
| CN103736600A true CN103736600A (en) | 2014-04-23 |
| CN103736600B CN103736600B (en) | 2016-07-06 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105080730A (en) * | 2015-09-10 | 2015-11-25 | 刘海平 | Silicon reduction and impurity removal method for low-grade bauxite |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1369328A (en) * | 2001-02-13 | 2002-09-18 | 中南大学 | Ore dressing process for desiliconizing bauxite |
| CN1803300A (en) * | 2005-11-28 | 2006-07-19 | 中国铝业股份有限公司 | Flotation selection and desiliconization method for middle and low grade alumyte |
| CN1947850A (en) * | 2006-11-03 | 2007-04-18 | 北京矿冶研究总院 | Reverse flotation desliming method for bauxite |
| CN101844112A (en) * | 2010-06-30 | 2010-09-29 | 中南大学 | Application of collecting agent in reverse floatation of bauxite |
-
2013
- 2013-12-30 CN CN201310737941.9A patent/CN103736600B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1369328A (en) * | 2001-02-13 | 2002-09-18 | 中南大学 | Ore dressing process for desiliconizing bauxite |
| CN1803300A (en) * | 2005-11-28 | 2006-07-19 | 中国铝业股份有限公司 | Flotation selection and desiliconization method for middle and low grade alumyte |
| CN1947850A (en) * | 2006-11-03 | 2007-04-18 | 北京矿冶研究总院 | Reverse flotation desliming method for bauxite |
| CN101844112A (en) * | 2010-06-30 | 2010-09-29 | 中南大学 | Application of collecting agent in reverse floatation of bauxite |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105080730A (en) * | 2015-09-10 | 2015-11-25 | 刘海平 | Silicon reduction and impurity removal method for low-grade bauxite |
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| CN103736600B (en) | 2016-07-06 |
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