CN101264909A - Technique for producing aluminum hydroxide or aluminum oxide by Bayer process - Google Patents
Technique for producing aluminum hydroxide or aluminum oxide by Bayer process Download PDFInfo
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- CN101264909A CN101264909A CNA2008100496389A CN200810049638A CN101264909A CN 101264909 A CN101264909 A CN 101264909A CN A2008100496389 A CNA2008100496389 A CN A2008100496389A CN 200810049638 A CN200810049638 A CN 200810049638A CN 101264909 A CN101264909 A CN 101264909A
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- mother liquor
- aluminum oxide
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Abstract
The invention relates to a process for manufacturing aluminum hydroxide or aluminum oxide by means of Bayer process, which comprises the following steps: when the solid content of alumyte primary ore pulp is indicated to exceed the specified standard in a final tank during a normal pressure desiliconization process, the qualified mother liquor obtained from a mother liquor evaporation process is mixed with the pre-desiliconized alumyte primary ore pulp with an over-standard solid content, and proportioned until the solid content of alumyte primary ore pulp complies with the relevant standard; then, pipeline stripping is conducted to prepare the aimed aluminum hydroxide or aluminum oxide. By partially improving the process sequences of evaporating the mother liquor, using the evaporated mother liquor to prepare and control the solid content of the ore pulp, and increasing the controllable points in the process, the preparation process of aluminum hydroxide or aluminum oxide has the advantages of improving the pass rate of the ore pulp for stripping, increasing the recovery rate of aluminum oxide during the process, and greatly bettering the effects of red mud separation and red mud washing.
Description
(1) technical field
The present invention relates to a kind of Bayer process and produce aluminium hydroxide or alumina technology.
(2) background technology
Produce in the production process of aluminium hydroxide or aluminum oxide at traditional Bayer process pipeline dissolving-out process, bauxite, lime, alkali lye are carried out raw material to grind and is made into the bauxite raw pulp, often directly carry out the canalization stripping behind the pressure-off silicon, carrying out red mud after the dilution separates, the isolating underflow of red mud carries out laterite washing, solid phase after the washing is that red mud is abandoned it, and the liquid phase of washing is then returned and is used for dilution; The isolating overflow of red mud is filtered, solid phase is still carried out red mud and is separated, liquid phase is then carried out seed decomposition, cyclone classification, the underflow of cyclone classification all carries out separating of aluminium hydroxide with overflow, separate the liquid phase that obtains and carry out mother liquid evaporation, the cyclone classification underflow carries out the isolating solid phase of aluminium hydroxide and washs, the solid that washing obtains is the aluminium hydroxide finished product, liquid phase is the white clay washing lotion, the white clay washing lotion is shunted, a part is carried out mother liquid evaporation with seed precipitation solution, and a part is sent laterite washing once washing groove, goes dilution with primary wash liquor.Wherein the qualified mother liquor that obtains of mother liquid evaporation is used for recirculated water or produces water being mixed with alkali lye and being used for raw material and grinding.The simple and easy flow process of mother liquid evaporation is referring to Fig. 1 in the tradition Bayer process production technique.
There is following problem in this technology: 1. bauxite, lime, alkali lye carry out raw material and grind the bauxite raw pulp solid content that obtains and be not easy control, and general easy to be higher when the pre-desiliconization slot of atmospheric silicon removing operation end groove detects, qualification rate is lower; 2. red mud separation and laterite washing are always because slip contains the unusual and muddy groove that height causes stripping slurry admittedly.
(3) summary of the invention
The object of the present invention is to provide a kind of Bayer process to produce aluminium hydroxide or alumina technology, particularly existing mother liquid evaporation trend is improved, bauxite raw pulp concentration is wayward in the present treatment process to solve, red mud separates and the problem of laterite washing weak effect.
The technical solution used in the present invention is as follows:
Bayer process is produced aluminium hydroxide or alumina technology, when bauxite raw pulp solid content shows when exceeding standard at the last groove of atmospheric silicon removing operation, the qualified mother liquor that the mother liquid evaporation operation is obtained mixes with bauxite raw pulp after the pre-desiliconization that solid content exceeds standard, allocate to the solid content of bauxite raw pulp up to standardly, and then carry out the canalization stripping and prepare aluminium hydroxide or aluminum oxide.
In general, the amount that adds of the qualified mother liquor that obtains of mother liquid evaporation operation is the 1-25% of bauxite raw pulp volume.
We are from the Material control of the each point position of Production Flow Chart, when bauxite raw pulp solid content shows when exceeding standard at the last groove of atmospheric silicon removing operation, part is delivered to the last groove of atmospheric silicon removing from the next qualified mother liquor of evaporation of mother liquid evaporation operation, carry out mixing preparation herein, to control the solid content of the bauxite raw pulp after the pre-desiliconization; This makes that the bauxite raw pulp that comes from burden process is that the atmospheric silicon removing operation has increased a reference mark at pre-desiliconization slot, has improved the qualification rate of the slip that enters the stripping operation; Control herein, the slip that makes the stripping operation obtain improves, and has avoided red mud to separate and the long-time muddy groove phenomenon of laterite washing subsider, and production process becomes steadily, and the rate of recovery of aluminum oxide is improved.If bauxite raw pulp solid content does not need to adjust, only need control by valve not add the qualified mother liquor that evaporation obtains herein and get final product.
The present invention has following advantage with respect to prior art:
The present invention is by improving the part of mother liquid evaporation technology trend, mother liquid evaporation is used for the allotment control of ore pulp solid content, increased the controllable dot of technological process, the slip qualification rate that enters stripping is improved, the alumina recovery rate of technological process is improved; Red mud separates and laterite washing effect also obviously improvement.
(4) description of drawings
The mother liquid evaporation that Fig. 1 produces aluminium hydroxide or alumina technology for the Bayer process before improving moves towards schema;
Fig. 2 moves towards schema for the mother liquid evaporation after improving.
(5) embodiment:
Below with specific embodiment technical scheme of the present invention is described, but protection scope of the present invention is not limited thereto:
Embodiment 1
The alkali lye of bauxite, lime, the qualified mother liquor preparation of evaporation is carried out material grinding together, form the bauxite raw pulp, then enter the atmospheric silicon removing operation, detecting the raw pulp solid content at the pre-desiliconization end of atmospheric silicon removing operation groove is 240g/l, the qualified mother liquor of evaporation that adds bauxite raw pulp volume 10%, after the mixing, ore pulp contains admittedly for about 220g/l after the pre-desiliconization, qualified, send the high pressure stripping, carry out red mud after the follow-up dilution and separate, the isolating underflow of red mud carries out laterite washing, the solid phase of washing is that red mud is abandoned it, and the liquid phase of washing is then returned and is used for dilution; The isolating overflow of red mud is filtered, solid phase is still carried out red mud and is separated, liquid phase is then carried out seed decomposition, cyclone classification, the underflow of cyclone classification all carries out separating of aluminium hydroxide with overflow, separates the liquid phase that obtains and carries out mother liquid evaporation, and the cyclone classification underflow carries out the isolating solid phase of aluminium hydroxide and washs, the solid that washing obtains is the aluminium hydroxide finished product, liquid phase is the white clay washing lotion, and a part is carried out mother liquid evaporation with seed precipitation solution, and another part then adds laterite washing once washing groove.
Embodiment 2
The alkali lye of bauxite, lime, the qualified mother liquor preparation of evaporation is carried out material grinding together, form the bauxite raw pulp, then enter the atmospheric silicon removing operation, detecting the raw pulp solid content at the pre-desiliconization end of atmospheric silicon removing operation groove is 250g/l, the qualified mother liquor of evaporation that adds bauxite raw pulp volume 14%, after the mixing, ore pulp contains admittedly for about 220g/l after the pre-desiliconization, qualified, send the high pressure stripping.Other are with embodiment 1.
Claims (2)
1. Bayer process is produced aluminium hydroxide or alumina technology, it is characterized in that showing when exceeding standard at the last groove of atmospheric silicon removing operation when bauxite raw pulp solid content, the qualified mother liquor that the mother liquid evaporation operation is obtained mixes with bauxite raw pulp after the pre-desiliconization that solid content exceeds standard, allocate to the solid content of bauxite raw pulp up to standardly, and then carry out the canalization stripping and prepare aluminium hydroxide or aluminum oxide.
2. Bayer process as claimed in claim 1 is produced aluminium hydroxide or alumina technology, it is characterized in that the amount of the qualified mother liquor adding that the mother liquid evaporation operation obtains is the 1-25% of bauxite raw pulp volume.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008100496389A CN101264909A (en) | 2008-04-25 | 2008-04-25 | Technique for producing aluminum hydroxide or aluminum oxide by Bayer process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008100496389A CN101264909A (en) | 2008-04-25 | 2008-04-25 | Technique for producing aluminum hydroxide or aluminum oxide by Bayer process |
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| CN101264909A true CN101264909A (en) | 2008-09-17 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNA2008100496389A Pending CN101264909A (en) | 2008-04-25 | 2008-04-25 | Technique for producing aluminum hydroxide or aluminum oxide by Bayer process |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103663517A (en) * | 2013-11-26 | 2014-03-26 | 中国铝业股份有限公司 | Method for reducing proportion of sodium and silicone in red mud dissolved out by ore dressing Bayer process |
| CN113856507A (en) * | 2021-10-18 | 2021-12-31 | 中铝矿业有限公司 | Imported bauxite pulp preparation device and method |
| CN113979457A (en) * | 2021-12-07 | 2022-01-28 | 中国铝业股份有限公司 | Dealkalization method for Bayer process red mud |
-
2008
- 2008-04-25 CN CNA2008100496389A patent/CN101264909A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103663517A (en) * | 2013-11-26 | 2014-03-26 | 中国铝业股份有限公司 | Method for reducing proportion of sodium and silicone in red mud dissolved out by ore dressing Bayer process |
| CN103663517B (en) * | 2013-11-26 | 2016-07-13 | 中国铝业股份有限公司 | A kind of method reducing Liquor of Ore Dressing Bayer process exsolution red mud sodium-silicon-rate |
| CN113856507A (en) * | 2021-10-18 | 2021-12-31 | 中铝矿业有限公司 | Imported bauxite pulp preparation device and method |
| CN113856507B (en) * | 2021-10-18 | 2024-04-02 | 中铝矿业有限公司 | Imported bauxite pulp preparation device and method |
| CN113979457A (en) * | 2021-12-07 | 2022-01-28 | 中国铝业股份有限公司 | Dealkalization method for Bayer process red mud |
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Open date: 20080917 |