CN102515217A - Method for adding lime to alumina produced by adopting ore-dressing Bayer process - Google Patents
Method for adding lime to alumina produced by adopting ore-dressing Bayer process Download PDFInfo
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- CN102515217A CN102515217A CN2011103667032A CN201110366703A CN102515217A CN 102515217 A CN102515217 A CN 102515217A CN 2011103667032 A CN2011103667032 A CN 2011103667032A CN 201110366703 A CN201110366703 A CN 201110366703A CN 102515217 A CN102515217 A CN 102515217A
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Abstract
The invention relates to a method for adding lime to alumina produced by adopting an ore-dressing Bayer process, in particular to a method for adding the lime in an original ore pulp mixing course in the ore-dressing Bayer process. The method is characterized in that an ore concentrate base flow is obtained after ore concentrate which is obtained after bauxite is floated is dehydrated by a thickener; and the ore concentrate base flow, the lime thinned by adopting a lime pulverizer, and a circulating alkali liquor are mixed to form standard original ore pulp according to the requirements of needed ingredients for [C/S], the solid contents and liquid phase Nk concentration. By adopting the method, the production flow is simplified, the labor intensity of workers is reduced, the bottleneck of production increase of the ore-dressing Bayer process is eliminated, and greater economic benefits can be created.
Description
Technical field
A kind of Liquor of Ore Dressing Bayer process is produced the method that aluminum oxide adds lime, particularly adds the method for lime in the Liquor of Ore Dressing Bayer process raw pulp allocation process.
Background technology
Lime is the main additive of strengthening the diaspore type bauxite stripping, and adding lime during stripping has following benefit: 1. improve AI
2O
3Dissolution rate; 2. reduce alkali loss; 3. eliminate TiO in the bauxite
2Detrimentally affect, avoid the generation of sodium titanate; 4. improve the red-mud settlement performance; 5. promote aluminium stripping in the alumogoethite; 6. removal of contamination.At present, the method for adding generally all is lime, ore, alkali lye to be added in the grid mill together grind, and the ore pulp that obtains supplies stripping to use.
Liquor of Ore Dressing Bayer process is owing to increased an ore dressing and desiliconizing flow process before stripping; Its raw pulp allotment material mainly contains three kinds; The one, lime is through the milk of lime of lime slaking machine system gained; The 2nd, the concentrate behind the bauxite flotation passes through the concentrate filter cake of filter second dehydration gained more earlier through the thickener primary dewatering, and the 3rd, circulation alkali liquor.Lime emulsification system method is the ashing of white clay washing lotion, because white clay washing lotion concentration is lower, in follow-up stripping is produced, has brought a large amount of moisture content into, causes system to water down seriously; And concentrate filters second dehydration technology, because equipment capacities such as ceramic filter, vertical-disk filter are on the low side, operation factor is not high, Operation and Maintenance defective such as difficulty relatively, causes concentrate to filter and produces difficulty, the compelled batching of participating in directly of a part of concentrate underflow.These all become the Liquor of Ore Dressing Bayer process alumina producing and put forward the unfavorable factor of producing consumption reduction.
Summary of the invention
The object of the invention is exactly the deficiency that is directed against on the above Technology, existing Liquor of Ore Dressing Bayer process is produced alumina technology improve, and proposes a kind of method that can effectively carry adding lime in the Liquor of Ore Dressing Bayer process raw pulp allocation process that produces consumption reduction, simplifies flow process.
The objective of the invention is to realize through following technical scheme.
A kind of Liquor of Ore Dressing Bayer process is produced the method that aluminum oxide adds lime; It is characterized in that the concentrate behind the bauxite flotation passes through thickener dehydration back gained concentrate underflow; With employing lime pulverizing mill levigated lime and circulation alkali liquor; [C/S] that requires according to required batching, contain admittedly and liquid phase Nk concentration requirement, be deployed into qualified raw pulp.
A kind of Liquor of Ore Dressing Bayer process of the present invention is produced the method that aluminum oxide adds lime, it is characterized in that lime adopts the lime pulverizing mill to grind, and the fineness of lime powder is that fineness is that 0.125mm tails over≤7%;
A kind of Liquor of Ore Dressing Bayer process of the present invention is produced the method that aluminum oxide adds lime, it is characterized in that the concentrate behind the bauxite flotation is 55%～60% through thickener dehydration back gained concentrate underflow density;
A kind of Liquor of Ore Dressing Bayer process of the present invention is produced the method that aluminum oxide adds lime, it is characterized in that circulation alkali liquor Nk >=245g/l.
Method of the present invention; Save labour intensity is big, energy consumption is high, level of automation is low concentrate filter dehydration operation and the big lime slaking machine operation of floor space, simplified Production Flow Chart, reduced labor strength; Eliminate Liquor of Ore Dressing Bayer process and carried the bottleneck of product, can create bigger economic benefit.
Embodiment
A kind of Liquor of Ore Dressing Bayer process is produced the method that aluminum oxide adds lime; It is characterized in that according to the raw pulp requirement [C/S], contain admittedly and liquid phase Nk concentration batching index, calculate lime, concentrate and the alkali lye amount of required adding, then that commercial lime is levigate with the lime pulverizing mill; Fineness is that 0.125mm tails over≤7%; Send into the raw pulp make-up tank with carrying the material scraper plate then, the weight concentration of thickener dehydration back gained is that 65%-72% concentrate underflow is directly squeezed into the raw pulp make-up tank with the underflow pump, adds the circulation alkali liquor of the Nk>=245g/l of requirement again; After in make-up tank, stirring, send preparatory desiliconization process.
Below in conjunction with implementing method of the present invention is further described.
Embodiment 1
Getting concentration is 70% thickener concentrate underflow 0.71M
3Squeeze into the raw pulp make-up tank with pump; Get 0.114 ton of the commercial lime of CaO content 88% then, levigate with the lime pulverizing mill, fineness is that 0.125mm tails over≤7%; Send into the raw pulp make-up tank with carrying the material scraper plate then; In make-up tank, adding Nk again is the circulation alkali liquor of 250g/l, is just contained 790g/l, [C/S] after stirring admittedly and be 1, Nk is the qualified raw pulp of allotment of 120 g/l, with the preparatory desiliconization process of pumping.
Embodiment 2
Getting concentration is 65% thickener concentrate underflow 0.71M
3Squeeze into the raw pulp make-up tank with pump; Get 0.114 ton of the commercial lime of CaO content 88% then, levigate with the lime pulverizing mill, fineness is that 0.125mm tails over≤7%; Send into the raw pulp make-up tank with carrying the material scraper plate then, in make-up tank, adding Nk again is the circulation alkali liquor 0.63M of 250g/l
3, just contained 770g/l, [C/S] after stirring admittedly and be 1.2, Nk is the qualified raw pulp of allotment of 103 g/l, with the preparatory desiliconization process of pumping.
Embodiment 3
Getting concentration is 68% thickener concentrate underflow 0.78M
3Squeeze into the raw pulp make-up tank with pump; Get 0.149 ton of the commercial lime of CaO content 88% then, levigate with the lime pulverizing mill, fineness is that 0.125mm tails over≤7%; Send into the raw pulp make-up tank with carrying the material scraper plate then; In make-up tank, adding Nk again is the circulation alkali liquor of 250g/l, is just contained 790g/l, [C/S] after stirring admittedly and be 1.3, Nk is the qualified raw pulp of allotment of 112 g/l, with the preparatory desiliconization process of pumping.
Claims (3)
1. a Liquor of Ore Dressing Bayer process is produced the method that aluminum oxide adds lime; It is characterized in that the concentrate behind the bauxite flotation passes through thickener dehydration back gained concentrate underflow; With employing lime pulverizing mill levigated lime and circulation alkali liquor; [C/S] that requires according to required batching, contain admittedly and liquid phase Nk concentration requirement, be deployed into qualified raw pulp.
2. a kind of Liquor of Ore Dressing Bayer process according to claim 1 is produced the method that aluminum oxide adds lime, it is characterized in that lime adopts the lime pulverizing mill to grind, and fineness is that fineness is that 0.125mm tails over≤7%.
3. a kind of Liquor of Ore Dressing Bayer process according to claim 1 is produced the method that aluminum oxide adds lime, it is characterized in that the concentrate behind the bauxite flotation is 65%-70% through thickener dehydration back gained concentrate underflow weight concentration;
A kind of Liquor of Ore Dressing Bayer process according to claim 1 is produced the method that aluminum oxide adds lime, it is characterized in that circulation alkali liquor Nk >=245g/l.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011103667032A CN102515217A (en) | 2011-11-18 | 2011-11-18 | Method for adding lime to alumina produced by adopting ore-dressing Bayer process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011103667032A CN102515217A (en) | 2011-11-18 | 2011-11-18 | Method for adding lime to alumina produced by adopting ore-dressing Bayer process |
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| CN102515217A true CN102515217A (en) | 2012-06-27 |
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| CN2011103667032A Pending CN102515217A (en) | 2011-11-18 | 2011-11-18 | Method for adding lime to alumina produced by adopting ore-dressing Bayer process |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105399120A (en) * | 2015-12-01 | 2016-03-16 | 中国铝业股份有限公司 | Method for adding lime in dissolution process of diaspore |
| CN107445182A (en) * | 2017-08-28 | 2017-12-08 | 中国铝业股份有限公司 | A kind of Liquor of Ore Dressing Bayer process matches somebody with somebody calcium method |
| CN116200608A (en) * | 2023-01-30 | 2023-06-02 | 中铝郑州有色金属研究院有限公司 | Method for recycling iron and aluminum from red mud |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1324765A (en) * | 2000-05-19 | 2001-12-05 | 郑州轻金属研究院 | Alumina producing process with hydraulic duralumin-type bauxite concentrate |
| CN1686811A (en) * | 2005-05-18 | 2005-10-26 | 中国铝业股份有限公司 | Method for desilication of concentrate through reverse flotation for bauxite |
| CN1686809A (en) * | 2005-05-18 | 2005-10-26 | 中国铝业股份有限公司 | Method of reverse flotation for preparing alumina from concentrate of beauxite |
| US20090169447A1 (en) * | 2007-12-28 | 2009-07-02 | Matthew Taylor | Methods and compositions for the removal of impurities and water from the bayer process |
| CN101716439A (en) * | 2009-12-18 | 2010-06-02 | 中国铝业股份有限公司 | Method for dehydrating micro-particle slurry |
-
2011
- 2011-11-18 CN CN2011103667032A patent/CN102515217A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1324765A (en) * | 2000-05-19 | 2001-12-05 | 郑州轻金属研究院 | Alumina producing process with hydraulic duralumin-type bauxite concentrate |
| CN1686811A (en) * | 2005-05-18 | 2005-10-26 | 中国铝业股份有限公司 | Method for desilication of concentrate through reverse flotation for bauxite |
| CN1686809A (en) * | 2005-05-18 | 2005-10-26 | 中国铝业股份有限公司 | Method of reverse flotation for preparing alumina from concentrate of beauxite |
| US20090169447A1 (en) * | 2007-12-28 | 2009-07-02 | Matthew Taylor | Methods and compositions for the removal of impurities and water from the bayer process |
| CN101716439A (en) * | 2009-12-18 | 2010-06-02 | 中国铝业股份有限公司 | Method for dehydrating micro-particle slurry |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105399120A (en) * | 2015-12-01 | 2016-03-16 | 中国铝业股份有限公司 | Method for adding lime in dissolution process of diaspore |
| CN107445182A (en) * | 2017-08-28 | 2017-12-08 | 中国铝业股份有限公司 | A kind of Liquor of Ore Dressing Bayer process matches somebody with somebody calcium method |
| CN116200608A (en) * | 2023-01-30 | 2023-06-02 | 中铝郑州有色金属研究院有限公司 | Method for recycling iron and aluminum from red mud |
| CN116200608B (en) * | 2023-01-30 | 2023-12-05 | 中铝郑州有色金属研究院有限公司 | Method for recycling iron and aluminum from red mud |
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Application publication date: 20120627 |
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