CN1810647A - Causticization process in alumina producing Bayer process - Google Patents
Causticization process in alumina producing Bayer process Download PDFInfo
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- CN1810647A CN1810647A CN 200610045877 CN200610045877A CN1810647A CN 1810647 A CN1810647 A CN 1810647A CN 200610045877 CN200610045877 CN 200610045877 CN 200610045877 A CN200610045877 A CN 200610045877A CN 1810647 A CN1810647 A CN 1810647A
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- causticization
- alumina producing
- bayer process
- producing bayer
- causticizing
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Abstract
The present invention discloses alumina producing process, and is especially the causticization process in alumina producing Bayer process. The continuous technological process includes the steps of: feeding causticizing liquid and lime milk in controlled amount into a heating tank while introducing fresh vapor to control the causticizing temperature; feeding the heated causticizing reactant liquid into a temperature maintaining tank and causticizing for sufficient time; and depositing separation of the causticized liquid in a depositing tank. The process is an automatic one with high causticization rate with sodium carbonate, resulting in lowered the amount and harm of sodium carbonate in Bayer process, simple operation and lowered labor strength.
Description
Technical field
The present invention relates to a kind of alumina-producing method, particularly relate to the causticization process in a kind of alumina producing Bayer process.
Background technology
In alumina producing Bayer process technology, can generate yellow soda ash because anti-causticization takes place the carbonate in bauxite and the lime in leaching process, and in seed precipitation solution, circulate, constantly accumulation is generally 10～20 grams per liters.After yellow soda ash reaches finite concentration, will separate out on stream, form fouling at pipeline and equipment surface, thus influence production, and reduce equipment capacity.Therefore must reduce the concentration of sodium carbonate in the technical process, carry out causticizing reaction, to reduce the harm that yellow soda ash causes production.Simultaneously, must make causticizing reaction thorough as far as possible, promptly require Bayer process causticization process causticizing efficiency to want high in order to guarantee that the circulation alkali liquor that Bayer process is used for stripping bauxite has higher concentration.
The causticization process flow process that adopts in the Bayer process alumina-producing method is an intermittent operation at present, this flow process production operation is not easy, and level of automation is not high, the bad control of productive capacity, causticizing efficiency undesirable (being≤80%), and operator's labour intensity is big.
Summary of the invention
The present invention is exactly the causticization process that provides in order to solve the problems of the technologies described above in a kind of alumina producing Bayer process, and purpose is to simplify production operation, improves level of automation, reduces labor strength, obtains higher causticizing efficiency.
In order to solve the problems of the technologies described above, the present invention is achieved in that the causticization process in a kind of alumina producing Bayer process, continuously send into causticization stoste and milk of lime in the heating tank respectively and control the addition of milk of lime, heating tank feeds live steam simultaneously, control causticization temperature relends the pressing aid air that contracts and continuously causticizing reaction liquid is sent into the insulation groove after the heating, guarantee the causticization time, to send subsider to carry out settlement separate for liquid after the causticization, and described processing step all is operate continuously.
The addition of described milk of lime is for satisfying CaO/Na
2The OC molecular ratio is 1.3～1.45.
The pressure of described feeding live steam is 0.5～0.6MPa.
The compressed-air actuated pressure of described feeding is 0.3～0.6MPa.
Described causticization temperature maintenance is at 95～99 ℃.
The described causticization time is 2～2.5 hours.
Advantage of the present invention and effect are: above technical scheme all is operate continuously, the level of automation height, can guarantee that sodium carbonate causticization has higher causticizing efficiency, thereby reduce concentration of sodium carbonate in the Bayer process flow process, reduce the harm of yellow soda ash in the Bayer process alumina producing, processing method of the present invention has been simplified production operation, has reduced working strength of workers, easily realizes.
Description of drawings
Fig. 1 is the causticization process schema in the alumina producing Bayer process of the present invention.
Among the figure, 1. pump; 2. pump; 3. heating tank; 4. insulation groove; 5. causticization slush pump.
Embodiment
As shown in Figure 1, causticization process flow process in the alumina producing Bayer process of the present invention is as follows: continuously causticization stoste is sent in the heating tank 3 with pump 1, detected causticization stoste density, send heating tank 3 with milk of lime with pump 2, control its flow, make the milk of lime addition satisfy CaO/Na
2The OC molecular ratio is 1.3～1.45, in heating tank 3, feed live steam simultaneously, the pressure of live steam is 0.5～0.6MPa (cutting off), the control steam flow, make heating tank 3 temperature maintenance at 95～99 ℃, after heating tank 3 heating, in the extraction pipe of heating tank 3, feed pressurized air, pressure is 0.3～0.6MPa (cutting off), constantly causticizing reaction liquid is sent in the insulation groove 4 by air for continuous, insulation groove 4 guarantees satisfied 2～2.5 hours of causticization time, after causticizing reaction finishes, to send subsider to carry out through causticization slush pump 5 settlement separate for liquid after the causticization, and described processing step all is operate continuously.Adopt the causticization process flow process of this operate continuously, the sodium carbonate causticization rate is reached more than 85%.
Claims (6)
1, the causticization process in a kind of alumina producing Bayer process, it is characterized in that processing step is as follows: continuously send into causticization stoste and milk of lime in the heating tank respectively and control the addition of milk of lime, heating tank feeds live steam simultaneously, control causticization temperature, relend the pressing aid air that contracts after the heating and continuously causticizing reaction liquid is sent into the insulation groove, guarantee the causticization time, to send subsider to carry out settlement separate for liquid after the causticization, and described processing step all is operate continuously.
2, the causticization process in the alumina producing Bayer process according to claim 1, the addition that it is characterized in that described milk of lime is for satisfying CaO/Na
2The OC molecular ratio is 1.3～1.45.
3, the causticization process in the alumina producing Bayer process according to claim 1, the pressure that it is characterized in that described feeding live steam is 0.5～0.6MPa.
4, the causticization process in the alumina producing Bayer process according to claim 1 is characterized in that the compressed-air actuated pressure of described feeding is 0.3～0.6MPa.
5, the causticization process in the alumina producing Bayer process according to claim 1 is characterized in that described causticization temperature maintenance is at 95～99 ℃.
6, the causticization process in the alumina producing Bayer process according to claim 1 is characterized in that the described causticization time is 2～2.5 hours.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200610045877 CN1810647A (en) | 2006-02-22 | 2006-02-22 | Causticization process in alumina producing Bayer process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200610045877 CN1810647A (en) | 2006-02-22 | 2006-02-22 | Causticization process in alumina producing Bayer process |
Publications (1)
| Publication Number | Publication Date |
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| CN1810647A true CN1810647A (en) | 2006-08-02 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200610045877 Pending CN1810647A (en) | 2006-02-22 | 2006-02-22 | Causticization process in alumina producing Bayer process |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103848446A (en) * | 2012-11-28 | 2014-06-11 | 沈阳铝镁设计研究院有限公司 | Side stream causticization method and apparatus of Bayer process alumina production |
| CN104203826A (en) * | 2012-03-07 | 2014-12-10 | Bhp比利顿沃斯勒铝私人有限公司 | High temperature processs for causticisation of a Bayer liquor |
-
2006
- 2006-02-22 CN CN 200610045877 patent/CN1810647A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104203826A (en) * | 2012-03-07 | 2014-12-10 | Bhp比利顿沃斯勒铝私人有限公司 | High temperature processs for causticisation of a Bayer liquor |
| CN103848446A (en) * | 2012-11-28 | 2014-06-11 | 沈阳铝镁设计研究院有限公司 | Side stream causticization method and apparatus of Bayer process alumina production |
| CN103848446B (en) * | 2012-11-28 | 2016-04-27 | 沈阳铝镁设计研究院有限公司 | A kind of lateral flow causticization method of Bayer process alumina producing and device |
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