CN86106054A - Lime-Bayer process processing-water-type bauxite is produced the technology of aluminum oxide - Google Patents
Lime-Bayer process processing-water-type bauxite is produced the technology of aluminum oxide Download PDFInfo
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- CN86106054A CN86106054A CN 86106054 CN86106054A CN86106054A CN 86106054 A CN86106054 A CN 86106054A CN 86106054 CN86106054 CN 86106054 CN 86106054 A CN86106054 A CN 86106054A CN 86106054 A CN86106054 A CN 86106054A
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- China
- Prior art keywords
- red mud
- cement
- lime
- bauxite
- washing
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)
Abstract
Lime---Bayer process processing-water-type bauxite is produced the technology of aluminum oxide.Belong to the processing method of producing aluminium hydroxide and aluminum oxide.The major technique feature is to the SiO in the ore
2Also correspondingly add lime and press and boil leaching, make SiO
2Partly or entirely generate moisture calcium aluminosilicate, thereby reduce or avoided the chemical loss of alkali.In addition, red mud can be used for producing silicate or other cement, accomplishes utilization of waste material, reduces environmental pollution.
Description
The invention belongs to the processing method (COIF7/02) of producing aluminum oxide.
The technology that Bayer process is handled bauxite into alumina is known.It is to press with sodium aluminate alkali solution to boil leaching bauxite, makes aluminum oxide wherein enter liquid phase, produces the solid alumina hydrate after separate out.When handling the monohydrate aluminium ore, if contain TiO in the ore
2, then to add corresponding lime and press and boil leaching, make TiO
2Be converted into uhligite.But under pressure is boiled condition, the SiO in the ore
2Contain sodium aluminosilicate of water with the generation of sodium aluminate alkali solution reaction, discharge Production Flow Chart, make alkaligenous chemical loss with residue-red mud; The discharge and the stacking of red mud cause environmental pollution, and the industrial utilization of red mud does not achieve satisfactory results at present as yet yet.
The purpose of this invention is to provide a kind of Bayer process flow process-lime bayer method that reduces or avoid the chemical loss of alkali,, provide a kind of effective way that industrial utilization is abandoned red mud simultaneously to handle alumina production with monohydrated bauxite.
Feature of the present invention is, when handling alumina silica ratio greater than 6 alumina production with monohydrated bauxite with Bayer process, to the SiO in the ore
2Also to add corresponding lime and press and boil leaching, make SiO
2Partly or entirely generate moisture calcium aluminosilicate, thereby reduce or avoided the chemical loss of alkali.
The present invention does not change the essential characteristic and the equipment of bayer process, and just to the SiO in the ore
2Also to add and join that lime carries out slip preparation and pressure is boiled leaching.Handled ore must be a monohydrated bauxite, and its aluminium silicon weight ratio should be greater than 6, and preferable ore alumina silica ratio is 8-15.To add the lime of joining be commercial lime, its addition is pressed CaO/SiO
2(add SiO in CaO in the lime and the ore
4Weight ratio) calculate CaO/SiO
2Generally can be controlled in 1.5-3.0, be preferably 2.0-3.0.When leaching ore in the autoclave, Controllable Temperature is built in 200-300 ℃, and optimum temps is different according to the ore leaching performance.Ore pulp after pressure is boiled carries out liquid-solid separation, i.e. sedimentation and filtration after with lower concentration sodium aluminate alkali solution dilution.The red mud of this technology has superior sedimentation, strainability.Filter cake promptly is a red mud, removes attachment removal alkali through washing.If intending with red mud is raw material production silicate cement or other cement, then abandon the Na of red mud
2O and K
2The summation of O content should be less than 3%, preferably below 2%.
Specific embodiment has provided a kind of effective means that use lime-bayer process flow process is produced aluminum oxide.Details are as follows: this technology is used original flow process of Bayer process and equipment, handled bauxite Al
2O
3/ SiO
2Be 8, its chemical constitution (weight percent is) SiO
28.97, Fe
2O
31.2, Al
2O
371.7, TiO
22.9, CaO0.2, MgO0.1, Na
2O0.1K
O0.05, alkali 13.8 burns.The mineral composition of this bauxite is, diaspore is about 70%, and boehmite is a small amount of, and kaolinite is about 20%, a small amount of and a spot of anatase octahedrite of mica mineral and rutile.Used lime is commercial lime, and the addition of lime is pressed CaO/SiO3.0 and calculated, owing to contain TiO in the ore
2, the same with Bayer process, also to add again and join some lime, this part amount of lime is pressed CaO/TiO
2Be 0.7 calculating.The bauxite of getting ready, lime and unsaturated sodium aluminate alkali solution (decomposition nut liquid is through evaporation process) are sent into the slurry preparation unit respectively with the preparation raw pulp.Raw pulp is sent into after the desiliconization to press through giving of for some time and is boiled the leaching unit, at 240 ℃ of aluminum oxide that leach down in the bauxite, dissolution time 0.5-3.0 hour, press the ore pulp after boiling to constitute by red mud and saturated sodium aluminate alkali solution, the saturated solution composition that is obtained is (grams per liter): Al
2O
3160-230, causticity Na
2O150-250, carbonic acid Na
2O-20, causticization coefficient 1.60.Above-mentioned pressure is boiled ore pulp and is used from sending into red mud setting tank behind the unitary rare sodium aluminate alkali solution dilution of laterite washing and carry out liquid-solid separation, its overflow is sent into leaf filter and is filtered, solution after the filter is sent into seed and is whisked decomposer and decompose, and the aluminium hydroxide of separating out is output finished product aluminum oxide after washing, roasting.Seed precipitation solution is through evaporating batching return time.And the underflow of red mud setting tank is sent into the laterite washing unit, the ore pulp after this unitary overflow is used for boiling towards rare pressure, and underflow is sent in the flow process of producing cement and is gone.
Compare with traditional Bayer process, advantage of the present invention is, because to the SiO in the ore2Also add and joined lime and press and boil leaching, make SiO2Partly or entirely generate moisture calcium aluminosilicate, thereby partly or entirely avoided the chemical loss of alkali, washing, the filterability of red mud are superior, and can be used as the raw material of producing portland cement and other cement, accomplish twice laid, eliminated that red mud is piled up and the environmental pollution that causes.
Claims (10)
1, a kind of processing method with Bayer process processing bauxite into alumina is boiled leaching, red mud separation and washing, decomposition, calcining process and is constituted by slurry preparation, pressure, it is characterized in that the SiO in the ore
2Also to add and join that lime carries out slurry preparation and pressure is boiled leaching, make the SiO in the bauxite
2Reaction generates moisture calcium aluminosilicate, and handled bauxite is monohydrated bauxite, and its aluminium silicon weight ratio is greater than 6.
2, in accordance with the method for claim 1, the alumina silica ratio that it is characterized in that handled monohydrate bauxite ore is 8-15.
3, according to claim 1 or 2 described methods, what it is characterized in that lime adds dosage by CaO in the lime and the SiO in the bauxite
2Weight ratio is calculated, and is generally 1.5-3.0, is preferably 2.0-3.0.
4, according to the method for stating of claim 1 or 2, it is characterized in that pressing the temperature of boiling leaching is 200-300 ℃.
5, in accordance with the method for claim 3, it is characterized in that pressing the temperature of boiling leaching is 200-300 ℃.
6,, it is characterized in that red mud as the raw material of producing silicate cement or other kind cement such as high-alumina cement, through washing, the Na of red mud according to claim 1 or 2 described methods
2O and K
2O content summation is less than 3%.
7, in accordance with the method for claim 3, it is characterized in that red mud as the raw material of producing silicate cement or other kind cement such as high-alumina cement, through washing, the Na of red mud
2O and K
2O content summation is less than 3%.
8, in accordance with the method for claim 4, it is characterized in that red mud as the raw material of producing silicate cement or other kind cement such as high-alumina cement, through washing, red mud Na
2O and K
2O content summation is less than 3%.
9, in accordance with the method for claim 6, it is characterized in that red mud is through washing, its Na
2O and K
2O content summation is less than 2%.
10, according to claim 7 or 8 described methods, it is characterized in that red mud through the washing, its Na
2O and K
2O content summation is less than 2%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 86106054 CN86106054A (en) | 1986-09-11 | 1986-09-11 | Lime-Bayer process processing-water-type bauxite is produced the technology of aluminum oxide |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 86106054 CN86106054A (en) | 1986-09-11 | 1986-09-11 | Lime-Bayer process processing-water-type bauxite is produced the technology of aluminum oxide |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN86106054A true CN86106054A (en) | 1988-03-23 |
Family
ID=4803083
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 86106054 Withdrawn CN86106054A (en) | 1986-09-11 | 1986-09-11 | Lime-Bayer process processing-water-type bauxite is produced the technology of aluminum oxide |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN86106054A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1049875C (en) * | 1996-11-15 | 2000-03-01 | 山西铝厂 | Primary mineral pulp preparation process in Baeyer's alumina producing process |
-
1986
- 1986-09-11 CN CN 86106054 patent/CN86106054A/en not_active Withdrawn
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1049875C (en) * | 1996-11-15 | 2000-03-01 | 山西铝厂 | Primary mineral pulp preparation process in Baeyer's alumina producing process |
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|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| WW01 | Invention patent application withdrawn after publication |