CN102491386A - Method for improving silica modulus of purified liquid obtained by Bayer process - Google Patents
Method for improving silica modulus of purified liquid obtained by Bayer process Download PDFInfo
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- CN102491386A CN102491386A CN2011103721319A CN201110372131A CN102491386A CN 102491386 A CN102491386 A CN 102491386A CN 2011103721319 A CN2011103721319 A CN 2011103721319A CN 201110372131 A CN201110372131 A CN 201110372131A CN 102491386 A CN102491386 A CN 102491386A
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- bayer process
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- siliceous modulus
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Abstract
The invention discloses a method for improving a silica modulus of purified liquid obtained by the Bayer process. The method provided by the invention can improve a silica modulus of purified liquid obtained by post-Bayer process ore-increasing thickening precipitation. The method provided by the invention is characterized in that 1, dilution and desilicication of precipitated ore pulp are reinforced and dilute ore pulp obatined by ore-increasing thickening precipitation is added with calcium-containing compounds so that silica minerals of an ore pulp liquid phase and the calcium-containing compounds undergo a full reaction to produce hydrated garnet precipitates, and thus solution silica content is reduced and a solution silica modulus is improved; and 2, through red mud settlement separation and filtration, purified sodium aluminate liquid having a silica modulus above 240 is obtained. Through the method provided by the invention, a seed decomposition requirement on a silica modulus of purified sodium aluminate liquid is satisfied and a scaling rate of spent liquor on evaporation equipment is reduced.
Description
Technical field
A kind of method that improves siliceous modulus in sintering section by bayer process, particularly a kind of method that adds seminal fluid siliceous modulus after the enrichment stripping of ore deposit after the Bayer process that improves belongs to technical field of alumina production.
Background technology
The bauxite overwhelming majority of China is a diaspore type bauxite, and condition is comparatively harsh when adopting the Bayer process stripping, need high temperature, high-alkalinity, and the molecular ratio of dissolution fluid is higher, is unfavorable for the production of sandy alumina.Suitably join the ore deposit when being employed in first section stripping diaspore less; Improve the causticity ratio of stripping slurries; Make diaspore ore abundant stripping under comparatively loose leaching condition, because the undersaturation of solution is bigger, the fully stripping quickly of the aluminum oxide in the ore; And the causticity of final dissolution fluid is than controlling by adding the ore deposit after the stripping: in the self-evaporatint n. stage of stripping slurry; The hydrargillite that is prone to stripping is added in the dissolved mineral slurry, utilize the waste heat of high temperature dissolved mineral slurry to make the further stripping of aluminum oxide in the three water ore ore deposits. can guarantee comparatively ideal dissolution fluid causticity ratio and red mud alumina silica ratio like this.This technological major advantage is to improve the cycle efficiency of Bayer process system, can increase output, reduces production costs, and reduces the comprehensive energy consumption of aluminum oxide.After add ore deposit enrichment dissolving-out technology under Chalco alumina producer realized industrial applications.Find that in application process after the enrichment stripping, the siliceous modulus of Bayer process seminal fluid has only about 140 after implementing; Be lower than Bayer process decomposition of crystal seed siliceous modulus greater than 200 requirement; Thereby influence the white lake quality product that decomposition of crystal seed is separated out, and then influenced the chemical quality of product aluminum oxide, and owing to dioxide-containing silica in the seed precipitation solution increases; In the evaporative process of seed precipitation solution, causing vaporizer to scab speeds up; The cleaning cycle of equipment shortened to about 20 days by original two months, had reduced the operation rate of vaporizer, had increased the evaporation energy consumption.
Summary of the invention
The object of the invention is exactly the deficiency that exists to above-mentioned prior art, provides a kind of and can effectively reduce the SiO in the solution
2Content obtains the seminal fluid of higher siliceous modulus, satisfies the requirement of decomposition of crystal seed to the sodium aluminate solution siliceous modulus, and reduces on evaporation equipment, the scab method of raising siliceous modulus in sintering section by bayer process of speed of seed precipitation solution.
The objective of the invention is to realize through following technical scheme.
A kind of method that improves siliceous modulus in sintering section by bayer process; It is characterized in that strengthening the dilution desiliconization process of dissolved mineral slurry, in the dilution ore pulp after the stripping of Hou Jiakuang enrichment, add calcium containing compound and insulated and stirred under weaker concn; Silicon mine and calcium containing compound in the ore pulp liquid phase are fully reacted; Generate the calcium aluminosilicate hydrate deposition and separate out, through red mud settlement separate, filter, obtain siliceous modulus greater than 240 sodium aluminate concentrate solution.
A kind of method that improves siliceous modulus in sintering section by bayer process of the present invention is characterized in that strengthening the dilution desiliconization process of dissolved mineral slurry, after the dilution ore pulp that adds after the enrichment stripping of ore deposit be to add red mud wash liquor adjustment ore pulp, pulp density is N
K120-180g/L.
A kind of method that improves siliceous modulus in sintering section by bayer process of the present invention is characterized in that calcium containing compound is quicklime, calcium hydroxide and calcium aluminate hydrates, and addition is 1-50g/L.
A kind of method that improves siliceous modulus in sintering section by bayer process of the present invention, the temperature that it is characterized in that desilication reaction are 80 ℃-105 ℃.
A kind of method that improves siliceous modulus in sintering section by bayer process of the present invention, the time that it is characterized in that desilication reaction is 1-6 hour.
Adopt method of the present invention; Silicon mine in the ore pulp liquid phase form deposition with calcium aluminosilicate hydrate or sodium white residue as much as possible is separated out and got into solid phase; Then, red mud slurry is through the processes such as settlement separate, solution refining of red mud, obtains siliceous modulus greater than 240 sodium aluminate concentrate solution; Satisfy the requirement of decomposition of crystal seed, and reduce the scab speed of seed precipitation solution on evaporation equipment the solution siliceous modulus.
In the technological process of alumina producing Bayer process, decomposition of crystal seed requires the siliceous modulus of sodium aluminate solution greater than 200, could guarantee SiO like this
2Significantly separate out in that kind the branch process is unlikely.When siliceous modulus was lower than 150-200, when white lake was separated out, silicon-dioxide also became hydrated aluminum silicate to separate out, and makes the SiO in the product
2Content exceeds code requirement, and makes Na
2O content increases, and influences the quality grade of product.After what add that ore deposit enrichment stripping usually adopts is external hydrargillite; Its organic content is higher; After the influence that causes was dilution desiliconization, solution refining, the siliceous modulus of seminal fluid had only about 140, was lower than Bayer process and decomposed the seminal fluid siliceous modulus greater than 200 requirement.
The present invention adopts sodium aluminate solution atmospheric silicon removing technology; Promptly through strengthening Bayer process dilution desiliconization process; The siliceous modulus of raising seminal fluid-take to prolong the residence time, the measure of interpolation calcium containing compound in dissolved mineral slurry dilution operation; Realize the raising of dilution ore pulp solution siliceous modulus, and then obtain high-quality seminal fluid.
After Bayer process is implemented back enrichment dissolving-out technology; Maybe be because higher organism be contained in outer ore deposit; The siliceous modulus of solution is on the low side after making its dilution desiliconization, adds calcium containing compound, on the one hand solution is had significant desiliconization; Calcium containing compound possibly play the effect of adsorb organic compound on the other hand, reduces the influence of organism to the solution silicon concentration.
Method of the present invention; Improved the siliceous modulus that adds seminal fluid after the enrichment stripping of ore deposit after the Bayer process; Through adding calcium containing compound in the dilution ore pulp after the enrichment stripping of back; And prolong the insulated and stirred time, and the silicon that exists with the water glass form in the sodium aluminate solution is separated out with the form of hydrated aluminum silicate or calcium aluminosilicate hydrate, reduce the SiO in the solution
2Content then, through the operating process such as settlement separate, filtration of red mud, obtains the seminal fluid of higher siliceous modulus, satisfies the requirement of decomposition of crystal seed to the sodium aluminate solution siliceous modulus, and reduces the scab speed of seed precipitation solution on evaporation equipment.
Embodiment
A kind of method that improves siliceous modulus in sintering section by bayer process; It is characterized in that strengthening the dilution desiliconization process of dissolved mineral slurry, in the dilution ore pulp after the stripping of Hou Jiakuang enrichment, add calcium containing compound and insulated and stirred under weaker concn; Silicon mine and calcium containing compound in the ore pulp liquid phase are fully reacted; Generate the calcium aluminosilicate hydrate deposition and separate out, through red mud settlement separate, filter, obtain siliceous modulus greater than 240 sodium aluminate concentrate solution.
During operation, in the ore pulp that adds after hydrargillite carries out the stripping of Bayer process enrichment, add red mud wash liquor and be adjusted into pulp density N
KThe dilution ore pulp of 120-180g/L adds the calcium containing compound of 1-50g/L, and makes slurries under 80-105 ℃ temperature stirring reaction 1-6 hour.Calcium containing compound can add with quicklime form, calcium hydroxide form (aquation ash) and calcium aluminate hydrates forms such as (alkali lye ashings).
Further specify through enforcement below.
Embodiment 1
Add the dissolved mineral slurry after the enrichment stripping of ore deposit after the Bayer process, add red mud wash liquor adjustment pulp density to N
K120g/L, the quicklime of adding 5g/L in the dilution ore pulp, after 6 hours, the red mud slurry is through after the liquid-solid separation at stirring reaction under 80 ℃ the temperature, and the siliceous modulus of the sodium aluminate concentrate solution of acquisition is 255.
Embodiment 2
Add the dissolved mineral slurry after the enrichment stripping of ore deposit after the Bayer process, add red mud wash liquor adjustment pulp density to N
K160g/L, the calcium hydroxide of adding 20g/L in the dilution ore pulp, after 4 hours, the red mud slurry is through after the liquid-solid separation at stirring reaction under 90 ℃ the temperature, and the siliceous modulus of sodium aluminate concentrate solution is 260.
Embodiment 3
Add the dissolved mineral slurry after the enrichment stripping of ore deposit after the Bayer process, add red mud wash liquor adjustment pulp density to N
K150g/L, the calcium aluminate hydrates of adding 50g/L in the dilution ore pulp, after 2 hours, the red mud slurry is through after the liquid-solid separation at stirring reaction under 105 ℃ the temperature, and the siliceous modulus of sodium aluminate concentrate solution is 280.
Embodiment 4
Add the dissolved mineral slurry after the enrichment stripping of ore deposit after the Bayer process, add red mud wash liquor adjustment pulp density to N
K150g/L, the calcium hydroxide of adding 10g/L in the dilution ore pulp, after 4 hours, the red mud slurry is through after the liquid-solid separation at stirring reaction under 100 ℃ the temperature, and the siliceous modulus of sodium aluminate concentrate solution is 320.
Embodiment 5
Add the dissolved mineral slurry after the enrichment stripping of ore deposit after the Bayer process, add red mud wash liquor adjustment pulp density to N
K180g/L adds the quicklime of 2g/L and the calcium aluminate hydrates of 30g/L in the dilution ore pulp, after 6 hours, the red mud slurry is through after the liquid-solid separation at stirring reaction under 100 ℃ the temperature, and the siliceous modulus of sodium aluminate concentrate solution is 300.
Embodiment 6
Add the dissolved mineral slurry after the enrichment stripping of ore deposit after the Bayer process, add red mud wash liquor adjustment pulp density to N
K160g/L, the calcium hydroxide of adding 10g/L in the dilution ore pulp, after 3 hours, the red mud slurry is through after the liquid-solid separation at stirring reaction under 105 ℃ the temperature, and the siliceous modulus of sodium aluminate concentrate solution is 340.
Claims (5)
1. method that improves siliceous modulus in sintering section by bayer process; It is characterized in that strengthening the dilution desiliconization process of dissolved mineral slurry, in the dilution ore pulp after the stripping of Hou Jiakuang enrichment, add calcium containing compound and insulated and stirred under weaker concn; Silicon mine and calcium containing compound in the ore pulp liquid phase are fully reacted; Generate the calcium aluminosilicate hydrate deposition and separate out, through red mud settlement separate, filter, obtain siliceous modulus greater than 240 sodium aluminate concentrate solution.
2. a kind of method that improves siliceous modulus in sintering section by bayer process according to claim 1 is characterized in that strengthening the dilution desiliconization process of dissolved mineral slurry, after the dilution ore pulp that adds after the enrichment stripping of ore deposit be to add red mud wash liquor adjustment ore pulp, pulp density is N
K120-180g/L.
3. a kind of method that improves siliceous modulus in sintering section by bayer process according to claim 1 is characterized in that calcium containing compound is quicklime, calcium hydroxide and calcium aluminate hydrates, and addition is 1-50g/L.
4. a kind of method that improves siliceous modulus in sintering section by bayer process according to claim 1, the temperature that it is characterized in that desilication reaction are 80 ℃-105 ℃.
5. a kind of method that improves siliceous modulus in sintering section by bayer process according to claim 1, the time that it is characterized in that desilication reaction is 1-6 hour.
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| CN2011103721319A CN102491386A (en) | 2011-11-22 | 2011-11-22 | Method for improving silica modulus of purified liquid obtained by Bayer process |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104140118A (en) * | 2013-05-06 | 2014-11-12 | 重庆任丙科技有限公司 | A producing method of high-purity aluminium oxide |
| CN115261619A (en) * | 2022-08-29 | 2022-11-01 | 安徽省地质矿产勘查局321地质队 | Method for promoting microbiological leaching of chalcopyrite by utilizing garnet |
| CN115321567A (en) * | 2022-08-16 | 2022-11-11 | 中国铝业股份有限公司 | Method for improving silicon content index of sodium aluminate solution in low-temperature Bayer process |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1775686A (en) * | 2005-12-15 | 2006-05-24 | 中国铝业股份有限公司 | Method for producing alumina by adding ore and concentrating after hydraulic aluminous stone type bauxite stripping |
| CN1865145A (en) * | 2005-05-19 | 2006-11-22 | 贵阳铝镁设计研究院 | Batching process after leaching in alumina production |
-
2011
- 2011-11-22 CN CN2011103721319A patent/CN102491386A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1865145A (en) * | 2005-05-19 | 2006-11-22 | 贵阳铝镁设计研究院 | Batching process after leaching in alumina production |
| CN1775686A (en) * | 2005-12-15 | 2006-05-24 | 中国铝业股份有限公司 | Method for producing alumina by adding ore and concentrating after hydraulic aluminous stone type bauxite stripping |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104140118A (en) * | 2013-05-06 | 2014-11-12 | 重庆任丙科技有限公司 | A producing method of high-purity aluminium oxide |
| CN115321567A (en) * | 2022-08-16 | 2022-11-11 | 中国铝业股份有限公司 | Method for improving silicon content index of sodium aluminate solution in low-temperature Bayer process |
| CN115261619A (en) * | 2022-08-29 | 2022-11-01 | 安徽省地质矿产勘查局321地质队 | Method for promoting microbiological leaching of chalcopyrite by utilizing garnet |
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Application publication date: 20120613 |