CN1377829A - Process for removing organics from sodium Bayer process aluminate solution - Google Patents
Process for removing organics from sodium Bayer process aluminate solution Download PDFInfo
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- CN1377829A CN1377829A CN 02110046 CN02110046A CN1377829A CN 1377829 A CN1377829 A CN 1377829A CN 02110046 CN02110046 CN 02110046 CN 02110046 A CN02110046 A CN 02110046A CN 1377829 A CN1377829 A CN 1377829A
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- calcium oxide
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- aluminate solution
- sodium aluminate
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Abstract
The present invention relates to the preparation of chemical intermediate. It is a technological process of removing organics from Bayer process sodium aluminate solution. The sodium aluminate solution material, which is obtained through leaching out from diaspore type bauxite, separation of red clay, precision filtering, regulation of components and desilication, has its organics removed through addition of calcium oxide of 0.1-1.0 mm size to react for 60-240 min and liquid-solid separation. The present invention has a elimination rate of 70-80% and is especially suitable for preparing pseudo-thin diasphore from deeply desilicifcated Bayer process sodium aluminate solution.
Description
Technical field the invention belongs to mineral compound intermediate preparation method, relates in particular to a kind of organic technology of removing from Bayer process sodium aluminate solution.
Background technology
Alumina producing Bayer process bauxite is no matter which kind of mineral type all contains a small amount of (some thousandths of to ten thousand/several) organic impurity; Humic-acid kind organism and alkaline reaction in the high temperature process in leaching generate various humic acids sodium salts, are dissolved in sodium aluminate solution; Circulation accumulation in Production Flow Chart, and be decomposed to form sodium oxalate (potassium) and aluminium carbonate salt complex by macromolecular compound gradually.Many in the world results of study show that organic content reaches finite concentration in the Bayer process sodium aluminate solution, can cause the many harm of alumina producing; As reduce Al
2O
3Solubility rate; Plant timesharing and make adding crystal seed inefficacy slowing down decomposition; Al (OH)
3The product refinement; Al
2O
3Impurity increases; Alkaline consumption increases; Red-mud settlement speed reduces; Fairly obvious etc. to the restraining effect of diaspore stripping especially.For example, there is report to work as organic content when reaching 2%, Al
2O
3Solubility rate is reduced to 67% by 89%.
Bayer process sodium aluminate solution is used to produce pseudo-boehmite, and the organic impurities in the solution is harmful especially, eliminates SiO at solution substantially through super deep desilication
2After, residual organic impurity in the solution just becomes the key factor of producing high purity pseudoboehmite.Residual organic impurity generates the very tiny oxalate of crystal grain in the solution, decomposes the colloidal Al that the output specific surface area is very big at sodium aluminate
2O
3During hydrate, oxalate often is adsorbed and adheres to Al
2O
3On the hydrate colloidal solid, co-precipitation with it causes the product dephasign to increase.
To how removing residual organic impurity in the Bayer process sodium aluminate solution, the insider has carried out a large amount of tests and practice.To this, reported in literature is a lot, as: with the bauxite precrushing, residual organic is removed in roasting under neutral atmosphere; Circulating mother liquor in producing is added Na
2C
2O
4H
2The O crystal seed is separated out organism; Mother liquid evaporation is separated out Na
2CO
3H
2O takes partial organic substances out of; In mother liquor, washing lotion, add MnO
2, milk of lime removes organism; Add MgSO
4, caoxalate ... directly from sodium aluminate solution, remove organism ... or the like.
Above-mentioned all methods, complex process, efficient not high (a tree name report, clearance rate preferably only reaches 40%), less economical; Can not adapt to from the reacted accurate solution of the super deep desilication of Bayer process sodium aluminate solution and remove organism.
Summary of the invention
Purpose of the present invention provides that a kind of technology is easy, clearance rate is high, be easy to industrialized technology, is particularly suitable for removing from the accurate solution behind the super deep desilication of Bayer process industrial sodium aluminate solution organic technology.
The objective of the invention is to implement by following technical measures:
Develop a kind of organic technology of from Bayer process sodium aluminate solution, removing, comprise the steps:
3. with the ore pulp of diaspore type bauxite stripping, through separating red mud, secondary filter, adjustment concentration of component, behind the desilication reaction, index reaches the sodium aluminate solution of following requirement, as raw material:
SiO
2Content ≈ 0 (＜0.00014g/L; Until leveling off to zero, silicon index aluminium/silicon is than 10000～500000=; Al
2O
325～85g/L; Organism is (with C
2O
4 2-Meter) 0.01～0.1g/L; Suspension content＜10ppm; Na
2Oc 1～15g/L; Fe
2O
30.1～1.0ppm; Caustic ratio 1.3～2.5; (Na
2Oc is meant yellow soda ash, converts to be Na
2O)
4. add particle diameter φ 0.1～1.0mm calcium oxide, addition is 2～8g/L; Stirring velocity 40～200rpm, 80～100 ℃ of temperature ranges, reaction times 60～240min replaces and absorption reaction;
3. reaction is finished, and carries out liquid, the solid separation; Gained filtrate prepares pseudo-boehmite for the next step.
Its described calcium oxide is the calcium oxide of chemical precipitation calcination of calcium carbonate, effective CaO content 80～98%;
Its described calcium oxide is a carbonate-free lime stone incinerating calcium oxide, effective CaO content 80～95%;
Its described displacement and absorption reaction are finished, and liquid, the solid organic slag that separates back formation are used Na
2O
TThe wash water dilution of＜1.0g/L mixes; Deliver to the red mud separating, washing and depositing groove and reclaim Al
2O
3, Na
2Behind the O, residue and red mud discharge simultaneously.
Advantage of the present invention is:
1. clearance rate height can be removed in the sodium aluminate solution organic impurities (with C
2O
4 2-The meter) 70～80%;
2. technology is easy, and technology is reliable, does not increase three waste discharge, the economic benefit height, and production scale is big;
3. be specially adapted to remove organism the accurate filtrate of the Bayer process sodium aluminate solution behind super deep desilication, obviously be better than other known method.
Embodiment:
Embodiment one
The ore pulp of Bayer process diaspore type bauxite stripping, through separating red mud, secondary filter, adjustment concentration of component, behind the desilication reaction, index reaches the sodium aluminate solution of following index request, as raw material:
SiO
2Content 0.00014～0.00018g/L; Al
2O
325～35g/L; Organism is (with C
2O
4 2-Meter) 0.01～0.05g/L; Suspension content 1～2ppm; Na
2O
c1～2g/L; Fe
2O
30.1～0.2ppm; Caustic ratio 1.3～1.4.
Described calcium oxide is the calcium oxide of chemical precipitation calcination of calcium carbonate, effective CaO content 80～85%;
Add the calcium oxide of φ 0.1～0.2mm, addition is 2～3g/L; In 80～85 ℃, stirring velocity 40～60rpm, reaction 60～80min replaces and absorption reaction.After calcium oxide drops into, rapidly in its surperficial ecto-entad digestion; Form a large amount of Ca
2+Overheated interface, absorption is the Na of easy reaction
2(K
2) C
2O
4H
2O generates CaC
2O
4H
2O; Effective CaO new life's Ca simultaneously
2+With the Al (OH) in the solution
4 -, the remaining SiO (OH) of minute quantity
2 2-Ionic reaction generates aquation ca aluminosilicate sosoloid, with the tiny CaC in the absorption
2O
4H
2The O crystal is separated out from solution jointly, becomes solid phase precipitation; Reaction is finished, and liquid, the solid separation are carried out in press filtration; The organic solid slag that contains that obtains contains C
2O
4 2-Reach 〉=0.62%, the C in the solution
2O
4 2-Be reduced to≤0.01g/L, elimination efficiency reaches 80.5%.
Solid slag contains C
2O
4 2-% * W/ raw material sodium aluminate solution C
2O
4 2-%=clearance rate %.
Liquid, the solid organic slag that separates back formation are used Na
2O
TThe wash water dilution of＜1.0g/L mixes; Deliver to the red mud separating, washing and depositing groove and reclaim Al
2O
3, Na
2Behind the O, residue and red mud discharge simultaneously.
The associativity of the inventive method and super deep desilication technology is good, and gained filtrate is again through secondary filter, and filtrate is adjusted to:
SiO
2Content is reduced to＜0.00014～0.00018g/L, until leveling off to zero; Al
2O
325～35g/L, suspension content 1～2ppm; Na
2O
c1～2g/L; Fe
2O
30.1～0.2ppm; Caustic ratio 1.3～1.4; For going on foot gelatinization reaction down, guaranteed the pseudo-boehmite crystalline phase purity of preparation technically.
Embodiment two SiO
20.00014～0.00018g/L; Al
2O
335～45g/L; Organism is (with C
2O
4 2-Meter) 0.01～0.04g/L; Suspended substance 2～3ppm; Na
2O
c3～4g/L; Fe
2O
30.3～0.4ppm; Caustic ratio 2.4～2.5; Add the calcium oxide of φ 0.2～0.3mm chemical precipitation calcination of calcium carbonate, effective CaO content 85～90%; Addition 4～5g/L; In 85～90 ℃, stirring velocity 70～90rpm, reaction 80～100min; Gained contains organic solid slag and contains C
2O
4 2-Reach 〉=0.48%, the C in the solution
2O
4 2-Be reduced to≤0.01g/L clearance rate 70.3%; All the other are with embodiment one.
Embodiment Three S's iO
20.00018～0.00022g/L; Al
2O
380～85g/L; Organism is (with C
2O
4 2-Meter) 0.09～0.1g/L; Suspended substance 9～10ppm; Na
2O
c14～15g/L; Fe
2O
30.9～1.0ppm; Caustic ratio 1.7～1.8; Calcium oxide is a carbonate-free lime stone incinerating calcium oxide, effective CaO content 90～95%; Add calcium oxide φ 0.9～1.0mm, addition is 7～8g/L; In 95～100 ℃, stirring velocity 180～200rpm, reaction 220～240min; Solid slag contains C
2O
4 2-〉=0.55%, the C in the solution
2O
4 2-Be reduced to≤0.01g/L clearance rate 77.8%.All the other are with embodiment one.
Embodiment four SiO
20.00020～0.00022g/L; Al
2O
380～85g/L; Organism is (with C
2O
4 2-Meter) 0.08～0.09g/L; Suspended substance 7～8ppm; Na
2O
c13～14g/L; Fe
2O
30.7～0.8ppm; Caustic ratio 1.6～1.7; Add 5～6g/L; φ 0.7～0.8mm carbonate-free lime stone incinerating calcium oxide, effective CaO content 85～90%; In 85～90 ℃, stirring velocity 180～200rpm, reaction 120～150min; Clearance rate 78.5%.All the other are with embodiment three.
Embodiment five SiO
20.00020～0.00022g/L; Al
2O
355～65g/L; Organism is (with C
2O
4 2-Meter) 0.01～0.02g/L; Suspended substance 2～3ppm; Na
2O
c3～4g/L; Fe
2O
30.3～0.4ppm; Caustic ratio 1.9～2.0; The calcium oxide that adds φ 0.2～0.3 mm chemical precipitation calcination of calcium carbonate, effective CaO content 95～98%; Addition is 4～5g/L; In 85～90 ℃, stirring velocity 70～90rpm, reaction 60～80min; Solid slag contains C
2O
4 2-〉=0.51%, the C in the solution
2O
4 2-Be reduced to≤0.01g/L clearance rate 80.3%.All the other are with embodiment one.
Embodiment six SiO
2Content 0.00014～0.00016g/L; Al
2O
375～80g/L; Organism is (with C
2O
4 2-Meter) 0.9～0.1g/L; Suspension content 9～10ppm; Na
2O
c14～15g/L; Fe
2O
30.9～1.0ppm; Caustic ratio 2.3～2.4; Calcium oxide is a carbonate-free lime stone incinerating calcium oxide, effective CaO content 90～95%; Add 7～8g/L φ, 0.1～0.2mm calcium oxide; In 80～85 ℃, stirring velocity 160～180rpm, reaction 220～240min replaces and absorption reaction, and elimination efficiency reaches 75.8%.All the other are with embodiment one.
Embodiment seven SiO
20.00020～0.00022g/L; Al
2O
370～75g/L; Organism is (with C
2O
4 2-Meter) 0.08～0.09g/L; Suspended substance 7～8ppm; Na
2O
c13～14g/L; Fe
2O
30.5～0.6ppm; Caustic ratio 1.3～1.4; Add 5～6g/L, φ 0.7～0.8mm carbonate-free lime stone incinerating calcium oxide, effective CaO content 85～90%; 85～90 ℃, stirring velocity 180～200rpm, reaction 120～150min; Clearance rate reaches 78.5%.All the other are with embodiment two.
Embodiment eight SiO
20.00014～0.00016g/L; Al
2O
380～85g/L; Organism is (with C
2O
4 2-Meter) 0.09～0.1g/L; Suspended substance 9～10ppm; Na
2O
c14～15g/L; Fe
2O
30.9～1.0ppm; Caustic ratio 1.6～1.7; Add the calcium oxide of 7～8g/L φ, 0.9～1.0mm effective CaO content, 90～95% limestone calcinations; In 85～90 ℃, stirring velocity 120～140rpm, reaction 220～240min; Solid slag contains C
2O
4 2-〉=0.55%, the C in the solution
2O
4 2-Be reduced to≤0.01g/L clearance rate 77.8%.All the other are with embodiment one.
Embodiment nine SiO
2Content 0.00014～0.00017g/L; Al
2O
360～65g/L; Organism is (with C
2O
4 2-Meter) 0.08～0.09g/L; Suspended substance 7～8ppm; Na
2O
c13～14g/L; Fe
2O
30.7～0.8ppm; Caustic ratio 1.3～1.4; Add φ 0.1～0.2mm carbonate-free lime stone incinerating calcium oxide, effective CaO content 85～90%; Addition is 5～6g/L; In 95～100 ℃, stirring velocity 100～120rpm, reaction 120～150min; Clearance rate 78.5%.All the other are with embodiment three.
Embodiment ten SiO
20.00020～0.00022g/L; Al
2O
355～65g/L; Organism is (with C
2O
4 2-Meter) 0.03～0.04g/L; Suspended substance 2～3ppm; Na
2O
c3～4g/L; Fe
2O
30.3～0.4ppm; Caustic ratio 2.3～2.4; The calcium oxide that adds φ 0.2～0.3mm chemical precipitation calcination of calcium carbonate, effective CaO content 95～98%; Addition is 4～5g/L; In 85～90 ℃, stirring velocity 70～90rpm, reaction 80～100min; Solid slag contains C
2O
4 2-〉=0.51%, the C in the solution
2O
4 2-Be reduced to≤0.01g/L clearance rate 79.3%.All the other are with embodiment one.
Embodiment 11 SiO
20.00020～0.00022g/L; Al
2O
360～65g/L; Organism is (with C
2O
4 2-Meter) 0.9～0.1g/L; Suspension content 9～10ppm; Na
2O
c14～15g/L; Fe
2O
30.9～1.0ppm; Caustic ratio 2.4～2.5; Calcium oxide is a carbonate-free lime stone incinerating calcium oxide, effective CaO content 90～95%; Add calcium oxide φ 0.9～1.0mm, addition is 7～8g/L; In 95～100 ℃, stirring velocity 80～100rpm, reaction 220～240min replaces and absorption reaction, and elimination efficiency reaches 75.8%.All the other are with embodiment one.
Embodiment 12 SiO
2Content 0.00014～0.00016g/L; Al
2O
365～70g/L; Organism is (with C
2O
4 2-Meter) 0.08～0.09g/L; Suspended substance 3～4ppm; Na
2O
c13～14g/L; Fe
2O
30.7～0.8ppm; Caustic ratio 1.8～1.9; Add φ 0.7～0.8mm carbonate-free lime stone incinerating calcium oxide, effective CaO content 80～85%; Addition is 5～6g/L; In 85～90 ℃, stirring velocity 150～170rpm, reaction 120～150min; Clearance rate reaches 78.5%.All the other are with embodiment two.
Embodiment ten Three S's iO
20.00016～0.00018g/L; Al
2O
335～45g/L; Organism is (with C
2O
4 2-Meter) 0.05～0.06g/L; Suspended substance 2～3ppm; Na
2O
c5～6g/L; Fe
2O
30.3～0.4ppm; Caustic ratio 1.3～1.4; Add the calcium oxide of φ 0.2～0.3mm chemical precipitation calcination of calcium carbonate, effective CaO content 85～90%; Addition 4～5g/L; In 85～90 ℃, stirring velocity 70～90rpm, reaction 80～100min; Gained contains organic solid slag and contains C
2O
4 2-Reach 〉=0.48%, the C in the solution
2O
4 2-Be reduced to≤0.01g/L clearance rate 70.3%; All the other are with embodiment one.
Embodiment 14 SiO
20.00020～0.00022g/L; Al
2O
345～50g/L; Organism is (with C
2O
4 2-Meter) 0.09～0.1g/L; Suspended substance 5～6ppm; Na
2O
c14～15g/L; Fe
2O
30.9～1.0ppm; Caustic ratio 1.5～1.6; Add φ 0.9～1.0mm, the carbonate-free lime stone incinerating calcium oxide of effective CaO content 90～95%, addition 7～8g/L; In 90～95 ℃, stirring velocity 40～60rpm, reaction 120～140min; Solid slag contains C
2O
4 2-〉=0.55%, the C in the solution
2O
4 2-Be reduced to≤0.01g/L clearance rate 77.8%.All the other are with embodiment one.
Embodiment 15 SiO
20.00014～0.00016g/L; Al
2O
325～30g/L; Organism is (with C
2O
4 2-Meter) 0.08～0.09g/L; Suspended substance 7～8 ppm; Na
2O
c13～14g/L; Fe
2O
30.7～0.8ppm; Caustic ratio 1.3～1.4; Add 5～6g/L, the carbonate-free lime stone incinerating calcium oxide of φ 0.7～0.8mm effective CaO content 85～90%; In 85～90 ℃, stirring velocity 80～100rpm, reaction 120～150min; Clearance rate 78.5%.All the other are with embodiment three.
Embodiment 16 SiO
20.00020～0.00022g/L; Al
2O
335～40g/L; Organism is (with C
2O
4 2-Meter) 0.06～0.07g/L; Suspended substance 2～3ppm; Na
2O
c3～4g/L; Fe
2O
30.3～0.4ppm; Caustic ratio 1.5～1.6; The calcium oxide that adds φ 0.2～0.3mm chemical precipitation calcination of calcium carbonate, effective CaO content 85～90%; Addition is 4～5g/L; In 85～90 ℃, stirring velocity 50～70rpm, reaction 80～100min; Solid slag contains C
2O
4 2-〉=0.51%, the C in the solution
2O
4 2-Be reduced to≤0.01g/L clearance rate 76.3%.All the other are with embodiment one.
Embodiment 17 SiO
2Content 0.00020～0.00022g/L; Al
2O
380～85g/L; Organism is (with C
2O
4 2-Meter) 0.9～0.1g/L; Suspension content 9～10ppm; Na
2O
c14～15g/L; Fe
2O
30.9～1.0ppm; Caustic ratio 1.9～2.0; Add carbonate-free lime stone incinerating effective CaO content 90～95%, the calcium oxide of φ 0.9～1.0mm, addition 7～8g/L; In 95～100 ℃, stirring velocity 140～160rpm, reaction 220～240min; Clearance rate 75.8%.All the other are with embodiment one.
Embodiment 18 SiO
20.00018～0.00020g/L; Al
2O
375～80g/L; Organism is (with C
2O
4 2-Meter) 0.08～0.09g/L; Suspended substance 7～8ppm; Na
2O
c7～8g/L; Fe
2O
30.5～0.6ppm; Caustic ratio 2.3～2.4; Add φ 0.7～0.8mm effective CaO content 85～90% carbonate-free lime stone incinerating calcium oxide, addition 2～3g/L; 85～90 ℃, stir speed 80～100rpm, reaction 120～150min; Clearance rate reaches 78.5%.All the other are with embodiment two.
Embodiment 19 SiO
20.00014～0.00016g/L; Al
2O
360～65g/L; Organism is (with C
2O
4 2-Meter) 0.09～0.1g/L; Suspended substance 9～10ppm; Na
2O
c2～3g/L; Fe
2O
30.9～1.0ppm; Caustic ratio 1.3～1.4; Calcium oxide is a carbonate-free lime stone incinerating calcium oxide, effective CaO content 90～95%; Add calcium oxide φ 0.9～1.0mm, addition is 4～5g/L; In 85～90 ℃, stirring velocity 100～120rpm, reaction 200～220min; Solid slag contains C
2O
4 2-〉=0.55%, the C in the solution
2O
4 2-Be reduced to≤0.01g/L clearance rate 77.8%.All the other are with embodiment one.
Embodiment 20 SiO
20.00018～0.00020g/L; Al
2O
380～85g/L; Organism is (with C
2O
4 2-Meter) 0.08～0.09g/L; Suspended substance 7～8ppm; Na
2O
c13～14g/L; Fe
2O
30.7～0.8ppm; Caustic ratio 1.7～1.8; Add the calcium oxide of φ 0.2～0.3mm effective CaO content 80～85% limestone calcinations, addition 2～3g/L; 95～100 ℃, stir speed 180～200rpm, reaction 120～150min; Clearance rate 78.5%.All the other are with embodiment three.
Embodiment 21 SiO
20.00020～0.00022g/L; Al
2O
355～65g/L; Organism is (with C
2O
4 2-Meter) 0.01～0.02g/L; Suspended substance 2～3ppm; Na
2O
c3～4g/L; Fe
2O
30.3～0.4ppm; Caustic ratio 1.3～1.4; The calcium oxide that adds φ 0.2～0.3mm effective CaO content 85～90% chemical precipitation calcination of calcium carbonate, addition 4～5g/L; In 85～90 ℃, stirring velocity 70～90rpm, reaction 80～100min; Solid slag contains C
2O
4 2-〉=0.51%, the C in the solution
2O
4 2-Be reduced to≤0.01g/L clearance rate 76.3%.All the other are with embodiment one.
Embodiment 22 SiO
20.00014～0.00016g/L; Al
2O
370～75g/L; Organism is (with C
2O
4 2-Meter) 0.9～0.1g/L; Suspended substance 1～2ppm; Na
2O
c14～15g/L; Fe
2O
30.1～0.2ppm; Caustic ratio 1.9～2.0; Add φ 0.9～1.0mm, effective CaO content 90～95%, carbonate-free lime stone incinerating calcium oxide, addition 7～8g/L; 85～90 ℃, stir speed 150～160rpm, reaction 220～240min, clearance rate 75.8%.Surplus with embodiment one.
Embodiment 20 Three S's iO
20.00020～0.00022g/L; Al
2O
375～80g/L; Organism is (with C
2O
4 2-Meter) 0.08～0.09g/L; Suspended substance 7～8ppm; Na
2O
c13～14g/L; Fe
2O
30.7～0.8ppm; Caustic ratio 2.3～2.4; Add the calcium oxide of φ 0.7～0.8mm effective CaO content 85～90% limestone calcinations, addition 5～6g/L; 80～85 ℃, stir speed 120～140rpm, reaction 120～150min; Clearance rate 78.5%.All the other are with embodiment two.
Embodiment 24 SiO
20.00014～0.00016g/L; Al
2O
340～45g/L; Organism is (with C
2O
4 2-Meter) 0.09～0.1g/L; Suspended substance 9～10ppm; Na
2O
c14～15g/L; Fe
2O
30.6～0.7ppm; Caustic ratio 1.3～1.4; Add φ 0.9～1.0mm, effective CaO content 90～95%, the calcium oxide of limestone calcination, addition are 2～3g/L; In 85～90 ℃, stirring velocity 150～160rpm, reaction 220～240min; Solid slag contains C
2O
4 2-〉=0.55%, the C in the solution
2O
4 2-Be reduced to≤0.01g/L clearance rate 77.8%.All the other are with embodiment one.
Embodiment 25 SiO
200020～0.00022g/L; Al
2O
345～50g/L; Organism is (with C
2O
4 2-Meter) 0.08～0.09g/L; Suspended substance 7～8ppm; Na
2O
c13～14g/L; Fe
2O
30.7～0.8ppm; Caustic ratio 2.4～2.5; Add the calcium oxide of φ 0.3～0.4mm limestone calcination, effective CaO content 85～90%; Addition 5～6g/L; 95～100 ℃, stir speed 180～200rpm, reaction 120～150min; Clearance rate 78.5%.All the other are with embodiment three.
Embodiment 26 SiO
20.00020～0.00022g/L; Al
2O
355～65g/L; Organism is (with C
2O
4 2-Meter) 0.02～0.03g/L; Suspended substance 2～3ppm; Na
2O
c3～4g/L; Fe
2O
30.3～0.4ppm; Caustic ratio 1.3～1.4; The calcium oxide that adds φ 0.2～0.3mm chemical precipitation calcination of calcium carbonate, effective CaO content 90～95%; Addition is 4～5g/L; In 85～90 ℃, stirring velocity 70～90rpm, reaction 80～100min; Solid slag contains C
2O
4 2-〉=0.51%, the C in the solution
2O
4 2-Be reduced to≤0.01g/L clearance rate 73.3%.All the other are with embodiment one.
Embodiment 27 SiO
20.00014～0.00016g/L; Al
2O
350～55g/L; Organism is (with C
2O
4 2-Meter) 0.9～0.1g/L; Suspension content 9～10ppm; Na
2O
c10～11g/L; Fe
2O
30.9～1.0ppm; Caustic ratio 1.9～2.0; Calcium oxide is a carbonate-free lime stone incinerating calcium oxide, effective CaO content 90～95%; Add calcium oxide φ 0.9～1.0mm, addition is 2～3g/L; In 85～90 ℃, stirring velocity 120～140rpm, reaction 220～240min replaces and absorption reaction, and elimination efficiency reaches 75.8%.All the other are with embodiment one.
Embodiment 28 SiO
20.00016～0.00018g/L; Al
2O
375～80g/L; Organism is (with C
2O
4 2-Meter) 0.08～0.09g/L; Suspended substance 5～6ppm; Na
2O
c9～10g/L; Fe
2O
30.2～0.3ppm; Caustic ratio 1.7～1.8; Add φ 0.3～0.4mm, the calcium oxide of effective CaO content 85～90% limestone calcinations, addition 5～6g/L; 90～95 ℃, stir speed 180～200rpm, reaction 120～150min; Clearance rate 78.5%.Surplus with embodiment two.
Embodiment 29 SiO
20.00018～0.00020g/L; Al
2O
380～85g/L; Organism is (with C
2O
4 2-Meter) 0.09～0.1g/L; Suspended substance 9～10ppm; Na
2O
c14～15g/L; Fe
2O
30.9～1.0ppm; Caustic ratio 1.3～1.4; Add φ 0.6～0.7mm, effective CaO content 90～95% carbonate-free lime stone incinerating calcium oxide, addition is 7～8g/L; 85～90 ℃, stir speed 100～120rpm, reaction 60～80min; Solid slag contains C
2O
4 2-〉=0.55%, the C in the solution
2O
4 2-Be reduced to≤0.01g/L clearance rate 77.8%.All the other are with embodiment one.
Embodiment 30 SiO
2Content 0.00014～0.00016g/L; Al
2O
325～30g/L; Organism is (with C
2O
4 2-Meter) 0.08～0.09g/L; Suspended substance 7～8ppm; Na
2O
c7～8g/L; Fe
2O
30.7～0.8ppm; Caustic ratio 1.3～1.4; Add the calcium oxide of φ 0.7～0.8mm effective CaO content 85～90% limestone calcinations, addition 3～4g/L; 85～90 ℃, stir speed 180～200rpm, reaction 120～150min; Clearance rate 78.5%.All the other are with embodiment three.
Embodiment hentriaconta-SiO
20.00020～0.00022g/L; Al
2O
355～65g/L; Organism is (with C
2O
4 2-Meter) 0.03～0.04g/L; Suspended substance 2～3ppm; Na
2O
c3～4g/L; Fe
2O
30.3～0.4ppm; Caustic ratio 2.3～2.4; The calcium oxide that adds φ 0.2～0.3mm effective CaO content 85～90% chemical precipitation calcination of calcium carbonate, addition 4～5g/L; 95～100 ℃, stir speed 70～90rpm, reaction 80～100min; Solid slag contains C
2O
4 2-〉=0.51%, the C in the solution
2O
4 2-Be reduced to≤0.01g/L, clearance rate 79.7%, all the other are with embodiment one.
Embodiment 32 SiO
2Content 0.00018～0.00020g/L; Al
2O
370～75g/L; Organism is (with C
2O
4 2-Meter) 0.9～0.1g/L; Suspension content 9～10ppm; Na
2O
c14～15g/L; Fe
2O
30.9～1.0ppm; Caustic ratio 1.3～1.4; Add φ 0.9～1.0mm, effective CaO content 90～95% carbonate-free lime stone incinerating calcium oxide, addition 7～8g/L; In 85～90 ℃, stirring velocity 140～160rpm, reaction 60～80min replaces and absorption reaction, and elimination efficiency reaches 75.8%.All the other are with embodiment one.
Embodiment 30 Three S's iO
2Content 0.00014～0.00016g/L; Al
2O
375～80g/L; Organism is (with C
2O
4 2-Meter) 0.08～0.09g/L; Suspended substance 7～8ppm; Na
2O
c13～14g/L; Fe
2O
30.7～0.8ppm; Caustic ratio 2.3～2.4; Add the calcium oxide of φ 0.1～0.2mm effective CaO content 85～90% limestone calcinations, addition 2～3g/L; 85～90 ℃, stir speed 180～200rpm, 120～150min; Clearance rate reaches 78.5%.All the other are with embodiment two.
Embodiment 34 SiO
20.00014～0.00018g/L; Al
2O
335～45g/L; Organism is (with C
2O
4 2-Meter) 0.01～0.02g/L; Suspended substance 2～3ppm; Na
2O
c9～10g/L; Fe
2O
30.3～0.4ppm; Caustic ratio 1.7～1.8; Add the calcium oxide of φ 0.2～0.3mm effective CaO content 85～90% chemical precipitation calcination of calcium carbonate, addition 4～5g/L; In 90～95 ℃, stirring velocity 80～90rpm, reaction 80～100min; Gained contains organic solid slag and contains C
2O
4 2-Reach 〉=0.48%, the C in the solution
2O
4 2-Be reduced to≤0.01g/L clearance rate 70.3%; All the other are with embodiment one.
Embodiment 35 SiO
20.00020～0.00022g/L; Al
2O
380～85g/L; Organism is (with C
2O
4 2-Meter) 0.09～0.1g/L; Suspended substance 1～2ppm; Na
2O
c6～7g/L; Fe
2O
30.9～1.0ppm; Caustic ratio 1.3～1.4; Calcium oxide is a carbonate-free lime stone incinerating calcium oxide, effective CaO content 90～95%; Add calcium oxide φ 0.9～1.0mm, addition is 3～4g/L; In 85～90 ℃, stirring velocity 200～240rpm, reaction 220～240min; Solid slag contains C
2O
4 2-〉=0.55%, the C in the solution
2O
4 2-Be reduced to≤0.01g/L clearance rate 77.8%.All the other are with embodiment one.
Embodiment 36 SiO
2Content 0.00014～0.00016g/L; Al
2O
345～50g/L; Organism is (with C
2O
4 2-Meter) 0.08～0.09g/L; Suspended substance 3～4ppm; Na
2O
c13～14g/L; Fe
2O
30.1～0.2ppm; Caustic ratio 1.5～1.6; Add the calcium oxide of φ 0.7～0.8mm effective CaO content 85～90% limestone calcinations, addition 5～6g/L; 85～90 ℃, stir speed 40～60rpm, reaction 120～150min; Clearance rate 78.5%.Surplus with embodiment three.
Embodiment 37 SiO
20.00020～0.00022g/L; Al
2O
355～65g/L; Organism is (with C
2O
4 2-Meter) 0.01～0.02g/L; Suspended substance 2～3ppm; Na
2O
c8～9g/L; Fe
2O
30.3～0.4ppm; Caustic ratio 1.3～1.4; The calcium oxide that adds φ 0.2～0.3mm effective CaO content 85～90% chemical precipitation calcination of calcium carbonate, addition 4～5g/L; In 85～90 ℃, stirring velocity 70～90rpm, reaction 80～100min; Solid slag contains C
2O
4 2-〉=0.51%, the C in the solution
2O
4 2-Be reduced to≤0.01g/L clearance rate 76.3%.All the other are with embodiment one.
Embodiment 38 SiO
20.00014～0.00016g/L; Al
2O
380～85g/L; Organism is (with C
2O
4 2-Meter) 0.9～0.1g/L; Suspension content 9～10ppm; Na
2O
c14～15g/L; Fe
2O
30.9～1.0ppm; Caustic ratio 1.9～2.0; Add φ 0.9～1.0mm, effective CaO content 90～95% carbonate-free lime stone incinerating calcium oxide, addition 7～8g/L; In 85～90 ℃, stirring velocity 50～60rpm, reaction 220～240min replaces and absorption reaction, and elimination efficiency reaches 75.8%.All the other are with embodiment one.
Embodiment 39 SiO
20.00014～0.00016g/L; Al
2O
355～60g/L; Organism is (with C
2O
4 2-Meter) 0.08～0.09g/L; Suspended substance 7～8ppm; Na
2O
c13～14g/L; Fe
2O
30.7～0.8ppm; Caustic ratio 2.3～2.4; Add φ 0.7～0.8mm carbonate-free lime stone incinerating calcium oxide, effective CaO content 85～90%; Addition is 2～3g/L; In 95～100 ℃, stirring velocity 80～100rpm, reaction 120～150min; Clearance rate reaches 78.5%.All the other are with embodiment two.
Embodiment 40 SiO
20.00020～0.00022g/L; Al
2O
380～85g/L; Organism is (with C
2O
4 2-Meter) 0.09～O.1g/L; Suspended substance 9～10ppm; Na
2O
c14～15g/L; Fe
2O
30.9～1.0ppm; Caustic ratio 1.3～1.4; Calcium oxide is a carbonate-free lime stone incinerating calcium oxide, effective CaO content 90～95%; Add calcium oxide φ 0.1～0.2mm, addition is 7～8g/L; In 85～90 ℃, stirring velocity 100～120rpm, reaction 220～240min; Solid slag contains C
2O
4 2-〉=0.55%, the C in the solution
2O
4 2-Be reduced to≤0.01g/L clearance rate 77.8%.All the other are with embodiment one.
Embodiment 41 SiO
20.00016～0.00018g/L; Al
2O
330～35g/L; Organism is (with C
2O
4 2-Meter) 0.08～0.09g/L; Suspended substance 7～8ppm; Na
2O
c13～14g/L; Fe
2O
30.7～0.8ppm; Caustic ratio 1.3～1.4; Add φ 0.7～0.8mm carbonate-free lime stone incinerating calcium oxide, effective CaO content 85～90%; Addition is 5～6g/L; In 85～90 ℃, stirring velocity 180～200rpm, reaction 120～150min; Clearance rate 78.5%.All the other are with embodiment three.
Claims (4)
1. from Bayer process sodium aluminate solution, remove organic technology for one kind, it is characterized in that comprising the steps:
1. with the ore pulp of diaspore type bauxite stripping, through separating red mud, secondary filter, adjustment concentration of component, behind the desilication reaction, index reaches the sodium aluminate solution of following requirement, as raw material:
SiO
2Content ≈ 0 (＜0.00014g/L);
Al
2O
3?25～85g/L；
Organism is (with C
2O
4 2-Meter) 0.01～0.1g/L;
Suspension content＜10ppm;
Na
2Oc?1～15g/L；
Fe
2O
3?0.1～1.0ppm；
Caustic ratio 1.3～2.5;
2. add particle diameter φ 0.1～1.0mm calcium oxide, addition is 2～8g/L; Stirring velocity 40～200rpm, 80～100 ℃ of temperature ranges, reaction times 60～240min replaces and absorption reaction;
3. reaction is finished, and carries out liquid, the solid separation; Gained filtrate prepares pseudo-boehmite for the next step.
2. from Bayer process sodium aluminate solution, remove organic technology according to claim 1 is described, it is characterized in that described calcium oxide is the calcium oxide of chemical precipitation calcination of calcium carbonate, effective CaO content 80～98%.
3. from Bayer process sodium aluminate solution, remove organic technology according to claim 1 is described, it is characterized in that described calcium oxide is a carbonate-free lime stone incinerating calcium oxide, effective CaO content 80～95%.
4. from Bayer process sodium aluminate solution, remove organic technology according to claim 1 is described, it is characterized in that described displacement and absorption reaction finish, liquid, separate organic slag that the back forms admittedly, use Na
2O
TThe wash water dilution of＜1.0g/L mixes; Deliver to the red mud separating, washing and depositing groove and reclaim Al
2O
3, Na
2Behind the O, residue and red mud discharge simultaneously.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103030162A (en) * | 2012-12-11 | 2013-04-10 | 中国科学院过程工程研究所 | Method for preparing sodium aluminate solid from bayer process red mud |
| CN101437758B (en) * | 2006-04-07 | 2013-04-24 | 阿尔科澳大利亚有限公司 | Method of reducing calcia concentrations of green bayer process liquors |
| CN109678185A (en) * | 2018-12-18 | 2019-04-26 | 杭州科创有色金属研究有限公司 | A kind of devices and methods therefor for crude liquid refining in alumina producing |
| CN112551564A (en) * | 2020-12-09 | 2021-03-26 | 沈阳铝镁设计研究院有限公司 | Deep purification method of sodium aluminate solution |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| IL44544A0 (en) * | 1973-04-03 | 1974-06-30 | Lazarus J | Image projector and viewer |
| EP0188268A3 (en) * | 1985-01-17 | 1990-01-31 | Alcoa Chemie GmbH | Process for the preparation of aluminiumhydroxide with a small content of impurities, especially of iron and with a high brightness |
-
2002
- 2002-03-05 CN CNB021100462A patent/CN1297480C/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101437758B (en) * | 2006-04-07 | 2013-04-24 | 阿尔科澳大利亚有限公司 | Method of reducing calcia concentrations of green bayer process liquors |
| CN103030162A (en) * | 2012-12-11 | 2013-04-10 | 中国科学院过程工程研究所 | Method for preparing sodium aluminate solid from bayer process red mud |
| CN109678185A (en) * | 2018-12-18 | 2019-04-26 | 杭州科创有色金属研究有限公司 | A kind of devices and methods therefor for crude liquid refining in alumina producing |
| CN112551564A (en) * | 2020-12-09 | 2021-03-26 | 沈阳铝镁设计研究院有限公司 | Deep purification method of sodium aluminate solution |
| CN112551564B (en) * | 2020-12-09 | 2023-03-10 | 沈阳铝镁设计研究院有限公司 | Deep purification method of sodium aluminate solution |
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