CN100371248C - Red mud separating method for alumina producing Bayer process - Google Patents
Red mud separating method for alumina producing Bayer process Download PDFInfo
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- CN100371248C CN100371248C CNB2006100454550A CN200610045455A CN100371248C CN 100371248 C CN100371248 C CN 100371248C CN B2006100454550 A CNB2006100454550 A CN B2006100454550A CN 200610045455 A CN200610045455 A CN 200610045455A CN 100371248 C CN100371248 C CN 100371248C
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Abstract
The red mud separating method for alumina producing Bayer process includes depositing separation of the leaching and diluting liquid, washing of red mud and filtering separation of red mud; and features the centrifuging separation of partial leaching and diluting liquid while deposition separating the other part, and the merging the overflowed liquid from centrifuging separation to the deposition separated liquid. The present invention combines centrifuging separation technique and the depositing separation technology, and has high red mud separating speed, reduced hydrolysis loss, raised leaching rate, raised washing efficiency, lowered red mud loss and raised production capacity.
Description
Technical field
The present invention relates to a kind of red mud separating method for alumina producing Bayer process, be used for red mud and separate.
Background technology
Red mud separates a requisite operation as the Bayer process alumina producing, its main flow process is a stripping diluent (with washing first groove overflow towards rare dissolution fluid) afterwards at present, deliver to separation tank and carry out preliminary liquid-solid separation, the subsider supernatant liquor enters subsequent processing, and underflow is delivered to washing settling groove and is repeatedly washed, the underflow that washs last groove send red mud filter to filter, filter filtrate enters washing settling groove and carries out backflush, and the overflow of washing first groove enters the allotment of carrying out concentration in the stripping slurries.
Two leading indicators judging the quality of red mud separation circuit are actual solubility rate η
RealWith net digestion efficiency η
OnlyDifference and additional loss, Δ η wherein
Real-η
OnlyDifference mainly be judge that red mud separates, the size of the hydrolysising loss in the washing process, additional loss L
Decrease(wherein NT refers to the full alkali of filter filtrate to=NTL/S, L/S is the liquid-solid ratio of filter cake) be the detersive efficiency of judging red mud, utilize subsider to carry out the isolating flow process of red mud, because the subsider surface-area is big, area of dissipation is big, the underflow liquid-solid ratio is subjected to the reasons such as restriction of red mud performance and raker stirrer machine intensity simultaneously, makes this process exist bigger hydrolysising loss and general detersive efficiency.
How can simplify Bayer process red mud and separate, shorten the time that red mud separates and washs, the reduction of temperature in the minimizing process reduces hydrolysising loss simultaneously, increases detersive efficiency, just becomes a very valuable research topic of red mud separation circuit.
Summary of the invention
The object of the present invention is to provide a kind of red mud separating method for alumina producing Bayer process, can the sharp separation red mud, reduce the red mud hydrolysising loss, increase laterite washing efficient.
Red mud separating method for alumina producing Bayer process of the present invention comprises settlement separate, the washing of red mud of stripping diluent and the filtering separation of red mud, it is characterized in that the part of stripping diluent is carried out centrifugation, and all the other carry out settlement separate.
It is comparatively suitable that the stripping diluent of participation centrifugation partly accounts for 1/5-1/2.
The overflowing liquid of centrifugation incorporated into together carry out settlement separately in the settlement separate diluent, can when improving the concentration of diluent, not increase the into solids content of subsider slurries like this, help the performance of flocculation agent effect.
Incorporate the washings first of centrifugation red mud into washing settling groove and wash separation, comprise first groove of washing or secondary washing groove, simplify flow process, can promote red mud to separate to greatest extent.
The present invention combines centrifugal separation technique with the subsider sedimentation-separation technology, avoid the simple centrifugation problem, the problem includes: the problem that floating addendum is too much and simple settlement separate speed is slow, stripping liquid concentration is limited, can accelerate red mud separates, can reduce the hydrolysising loss in red mud separation, the washing process effectively, dwindle the difference of actual solubility rate and net digestion efficiency, because the solid phase liquid-solid ratio of centrifugation is little, also can significantly improve detersive efficiency simultaneously, reduce the red mud additional loss.Because a part of diluent is carried out centrifugation, directly advance filter after separating underflow adds wash water and mixes and carry out washing and filtering, isolating overflow is mixed into subsider with another part diluent again and separates, like this can be when improving the concentration of diluent, do not increase the into solids content of subsider slurries, help the performance of flocculation agent effect.Improve the concentration of diluent, promptly can improve the stripping concentration of process in leaching, thereby improve the production capacity of producing.By centrifugal separation technique is combined with existing subsider sedimentation techniques, can effectively improve the liquid measure processing power of sedimentation operation, provide a solution fast to the Bayer process alumina producing enterprise that has bottleneck at the red mud separation circuit.
Description of drawings
Fig. 1, process flow diagram of the present invention.
Embodiment
The invention will be further described below in conjunction with embodiment.
The test situation of the application unit is as follows:
Whizzer separating resulting: the ore A/S=7.35 that this test is used
Charging (diluent) situation see the following form (g/l)
| NT | AO | NK | Solid content |
| 162.2 | 172.78 | 152.5 | 45 |
Overflow and underflow situation see the following form (g/l)
| NT | AO | NK | Solid content | Underflow attached liquid (%) |
| 161.8 | 171.54 | 151.8 | 5 | 35.2 |
The exsolution red mud situation sees the following form
| SiO 2 | Al 2O 3 | NaO | A/S | N/S | Actual solubility rate % |
| 26.43 | 21.25 | 10.25 | 0.80 | 0.39 | 89.12 |
Centrifugation red mud situation sees the following form
| SiO 2 | Al 2O 3 | NaO | A/S | N/S | Separate solubility rate % |
| 25.58 | 21.45 | 9.77 | 0.84 | 0.33 | 88.57 |
From test situation as can be seen, have only 0.55%, compare, can obviously reduce hydrolysising loss with industrial production through the red mud separation solubility rate of sharp separation and the difference of actual solubility rate.According to above test-results, following scheme balance is carried out in each material concentration and distribution in the flow process:
With the stripping liquid concentration in the above measurement result, washing lotion concentration, diluent concentration is all corresponding mentions 20%, concentration situation such as following table after the raising.
Charging (diluent) situation see the following form (g/l)
| NT | AO | NK | Solid content |
| 194.64 | 207.34 | 183 | 54 |
1/3 of this concentration dilution liquid is entered whizzer carry out centrifugation, separating the back mixes with all the other diluents of 2/3, the solid content that then enters the diluent of subsider is: 54 * 2/3+5 * 1/3=39.33g/l, solid content before specific concentration improves is also low, therefore, can carry out effectively settlement separate.
And the washing of red mud reduces nearly 1/3 owing to enter the red mud amount of subsider rinse bath part, bigger variation can not take place in sedimentation bottom land stream liquid-solid ratio under the normal circumstances, has only 2/3 of original system so bring the attached liquid of washing system into, other 1/3 red mud enters whizzer with centrifugation, because whizzer underflow attached liquid is lower, washing relatively easily will further be strengthened so improve the washing effect of concentration system.
Claims (2)
1. red mud separating method for alumina producing Bayer process, comprise settlement separate, the washing of red mud of stripping diluent and the filtering separation of red mud, it is characterized in that the part of stripping diluent is carried out centrifugation, all the other carry out settlement separate, the overflowing liquid of centrifugation incorporate into together carry out in the settlement separate diluent settlement separate.
2. red mud separating method for alumina producing Bayer process according to claim 1, the washings first that it is characterized in that the centrifugation red mud is incorporated washing settling groove into and is washed separation.
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| Application Number | Priority Date | Filing Date | Title |
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| CNB2006100454550A CN100371248C (en) | 2006-07-16 | 2006-07-16 | Red mud separating method for alumina producing Bayer process |
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| CNB2006100454550A CN100371248C (en) | 2006-07-16 | 2006-07-16 | Red mud separating method for alumina producing Bayer process |
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| CN1887711A CN1887711A (en) | 2007-01-03 |
| CN100371248C true CN100371248C (en) | 2008-02-27 |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100532262C (en) * | 2007-07-12 | 2009-08-26 | 中国铝业股份有限公司 | Method for producing aluminium oxide by middle-low grade alumyte |
| CN101264910B (en) * | 2008-04-25 | 2010-10-13 | 河南未来铝业（集团）有限公司 | Mother liquor evaporation seed addition method for aluminum hydroxide or aluminum oxide production technique by Bayer process |
| CN104528785A (en) * | 2014-12-11 | 2015-04-22 | 广西华银铝业有限公司 | Method for improving settling separation performance of bauxite slurry |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1370741A (en) * | 2002-03-26 | 2002-09-25 | 贵州铝厂 | Red clay separation process for alumina sintering production |
| CN1613771A (en) * | 2004-11-25 | 2005-05-11 | 中国铝业股份有限公司 | Method for separating red mud from alumina stripping slurry |
| CN1743077A (en) * | 2005-09-22 | 2006-03-08 | 贵阳铝镁设计研究院 | Coarse-fine red mud grading method |
| CN1772617A (en) * | 2005-09-28 | 2006-05-17 | 中国铝业股份有限公司 | Sintering process of separating red mud for alumina production |
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- 2006-07-16 CN CNB2006100454550A patent/CN100371248C/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1370741A (en) * | 2002-03-26 | 2002-09-25 | 贵州铝厂 | Red clay separation process for alumina sintering production |
| CN1613771A (en) * | 2004-11-25 | 2005-05-11 | 中国铝业股份有限公司 | Method for separating red mud from alumina stripping slurry |
| CN1743077A (en) * | 2005-09-22 | 2006-03-08 | 贵阳铝镁设计研究院 | Coarse-fine red mud grading method |
| CN1772617A (en) * | 2005-09-28 | 2006-05-17 | 中国铝业股份有限公司 | Sintering process of separating red mud for alumina production |
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