CN108658111A - A method of improving alumina producing Bayer process efficiency - Google Patents
A method of improving alumina producing Bayer process efficiency Download PDFInfo
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- CN108658111A CN108658111A CN201810974868.XA CN201810974868A CN108658111A CN 108658111 A CN108658111 A CN 108658111A CN 201810974868 A CN201810974868 A CN 201810974868A CN 108658111 A CN108658111 A CN 108658111A
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
- C01F7/00—Compounds of aluminium
- C01F7/02—Aluminium oxide; Aluminium hydroxide; Aluminates
- C01F7/04—Preparation of alkali metal aluminates; Aluminium oxide or hydroxide therefrom
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
- C01F7/00—Compounds of aluminium
- C01F7/02—Aluminium oxide; Aluminium hydroxide; Aluminates
- C01F7/04—Preparation of alkali metal aluminates; Aluminium oxide or hydroxide therefrom
- C01F7/06—Preparation of alkali metal aluminates; Aluminium oxide or hydroxide therefrom by treating aluminous minerals or waste-like raw materials with alkali hydroxide, e.g. leaching of bauxite according to the Bayer process
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
- C01F7/00—Compounds of aluminium
- C01F7/02—Aluminium oxide; Aluminium hydroxide; Aluminates
- C01F7/04—Preparation of alkali metal aluminates; Aluminium oxide or hydroxide therefrom
- C01F7/14—Aluminium oxide or hydroxide from alkali metal aluminates
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Abstract
The present invention relates to a kind of methods improving alumina producing Bayer process efficiency, the piece alkali that this method must be supplemented with using alumina producer is reacted with Bayer-process seed-separating mother liquor or evaporation mother liquor, high severe alkali, high molecule ratio sodium aluminate solution are formed, does not need to exclude carbon alkali and its causticization by forcing the processes such as effect evaporation that pregnant Bayer liquor can be realized；By realizing the efficient crystallization process of intermediate products aluminate hydrates sodium, the cycle efficieny and the production capacity under existing weaponry and equipment that dissolution medium can be improved.The present invention can be under the premise of not inputting other materials or energy, you can synchronous to realize salt discharge causticization and improve medium circulation efficiency；Newly-increased aluminate hydrates sodium crystallization process mild condition, equipment investment is low, and industry is handling strong, and economic benefit is apparent.Alumina product produced by the invention and the alumina product of existing Bayer process are identical in quality, and no any newly-increased exhaust gas, waste liquid or solid waste generate, energy conservation and environmental protection.
Description
Technical field
The present invention relates to technical field of alumina production more particularly to a kind of sides for improving alumina producing Bayer process efficiency
Method.
Background technology
Metallic aluminium and aluminum oxide industry are the important foundation raw material industries of the national economic development.Commercial alumina total output
90% or more be used for electrolysis production metallic aluminium, it is other then be used for electronics, refractory material, oil, chemical industry, ceramics, environmental protection
And the fields such as pharmacy.
2017,69,020,000 tons of China's aluminium oxide yield, accounting world wide production 56.2%.Currently, the industry of aluminium oxide is raw
Production method is substantially alkaline process, includes mainly Bayer process, sintering process and Bayer-sintering combination method.Have benefited from technology and equipment into
It walks, be limited by economy constraint, existing metallurgical-grade aluminum oxide uses bayer process to be produced substantially.
K.J.Bayer proposes Bayer process production principle between 1889~1892 years, can mainly be dissolved out by bauxite, dilution takes off
The closed cycle that silicon, sperm kind are divided, medium evaporation Four processes are formed is described.Though through technology and dress more than 120 year
Standby progress, but the basic principle of Bayer process does not change yet, i.e., and the circulatory mediator that molecular proportion is 3 or so in process in leaching passes through molten
Diaspore, boehmite or the gibbsite in bauxite are solved, molecular proportion is made and is 1.5 or so, aluminium oxide is saturated
Sodium aluminate solution, then through refined obtained molecular proportion be still 1.5 or so, be suitble to kind of a sodium aluminate concentrate solution for point decomposition, secondly by
Seeded precipitation process obtains aluminium hydroxide intermediate products and molecular proportion as 3 or so seed precipitation solution, and last seed precipitation solution passes through
Evaporation draining and benefit alkali obtain the circulating mother liquor that molecular proportion is 3 or so, and circulating mother liquor is molten as circulatory mediator return process in leaching
Solve bauxite.
As shown in the above, it is 3 or so to follow that one of critical process of existing Bayer process alumina producing, which is molecular proportion,
Ring mother liquor dissolves bauxite and the saturated solution of sodium aluminate that molecular proportion is 1.5 or so is made.(i.e. molecular proportion is 3 to unit dissolution medium
Left and right circulating mother liquor) processing bauxite production capacity, that is, medium circulation efficiency mainly determined by the state always of molecular proportion.And
And medium, after initially severe alkali concentration and leaching temperature determine, saturation sodium aluminate solution molecular proportion obtained is determination.Therefore, it carries
One of key of high Bayer process medium circulation efficiency is how to improve the molecular proportion of circulating mother liquor.
Sintering process can prepare aluminium hydroxide by carbonation decomposition, and decomposition efficiency is far above 50%, however uses sintering process
Aluminium hydroxide or alumina product obtained are high-quality not as good as Bayer process, and since sintering process comprehensive energy consumption level is far above Bayer
Method, in addition to preparing chemical aluminum oxide, existing alumina producing enterprise no longer uses sintering process technique or Bayer-sintering connection substantially
It is legal.
During existing Bayer seeds precipitation, the effect for improving mother liquor molecular proportion by Optimal Decomposition system has very much
Limit.It is detached as the alkaline constituents in extractant extraction sodium aluminate solution, or by electrolytic process using fatty alcohol or alkyl phenol
Alkaline constituents and high molecule ratio sodium aluminate solution is made, or the method for carrying out dilution crystallization by introducing the third components such as methanol,
It is difficult to the drawbacks such as commercial Application there are the organic component that production cost is high or high energy consumption, introducing are unrelated with Bayer system.
Thus, existing method cannot it is economical, effectively improve existing Bayer process aluminum oxide production process medium circulation efficiency.
Invention content
In view of problems of the prior art, piece alkali that the present invention must be supplemented with using alumina producer and seed precipitation solution or
Mother liquor reaction is evaporated, high severe alkali, high molecule ratio sodium aluminate solution are formed, does not need to visit by forcing the processes such as effect evaporation can be realized
Ear mother liquor, which synchronizes, excludes carbon alkali and its causticization；By realizing the efficient crystallization process of intermediate products aluminate hydrates sodium, can improve
The cycle efficieny and the production capacity under existing weaponry and equipment of dissolution medium.The present invention can be before not inputting other materials or energy
It puts, you can synchronous to realize salt discharge causticization and improve medium circulation efficiency；Newly-increased aluminate hydrates sodium crystallization process mild condition, if
Standby investment is low, and industry is handling strong, and economic benefit is apparent.
For this purpose, present invention employs following technical solutions：
The present invention provides a kind of methods improving alumina producing Bayer process efficiency comprising following steps：
(1) it uses solid NaOH to mix, react with Bayer system seed precipitation solution or evaporation mother liquor, adjusts severe alkali concentration extremely
300g/L or more；
(2) slurries that step (1) obtains are mixed with sodium carbonate crystal seed, carries out sodium carbonate crystallization process；After crystallization,
Sodium carbonate slag phase and salt discharge mother liquor are obtained through solid-liquor separation；
(3) severe alkali concentration is adjusted into severe alkali concentration to 350g/L is not less than less than the salt discharge mother liquor of 350g/L, is crystallized
Preceding liquid；
(4) liquid carries out aluminate hydrates sodium crystallization process before the crystallization for obtaining step (3)；After crystallization, divide admittedly through liquid
From obtaining crystal slag and crystalline mother solution；
(5) the crystal slag for obtaining step (4) dissolves, and send to Bayer production process and dilutes desiliconization process, is then planted
Divide process, obtains aluminum hydroxide precipitation；
(6) crystalline mother solution for obtaining step (4) is sent into Bayer production process and dissolves out process, then obtains Bayer Process digestion
Slurry obtains aluminum hydroxide precipitation through diluting desiliconization, refined, decomposable process；
(7) causticization after the sodium carbonate slag phase dissolving obtained step (2), is made NaOH solution and causticization slag, NaOH solution
It is sent into Bayer dissolution process and removes dissolving bauxite.
The method of the present invention uses solid NaOH allotment seed precipitation solution or evaporation mother liquor to severe alkali concentration 300g/L or more,
The efficient carbon alkali exclusion process that mother liquor can be realized under the premise of without forcing effect to be evaporated saves pressure effect evaporation equipment and throws
The problems such as money is big, evaporation process operation is difficult and consumption steam；The sodium aluminate solution obtained after allotment is appropriate for aluminate hydrates
Sodium crystallization process, by the efficient crystallization process of aluminate hydrates sodium, obtained aluminate hydrates sodium intermediate products easy to dissolve and
The sodium aluminate solution of high molecule ratio, high severe alkali concentration；Aluminate hydrates sodium intermediate products obtain molecular proportion on 1.5 left sides by dissolving
Liquid before kind point that is right, being suitble to kind of point process, and then aluminium hydroxide intermediate products are made, improve medium circulation efficiency；Macromolecule
Sodium aluminate solution than, high severe alkali concentration directly returns to Bayer Process digestion process, can significantly increase dissolution ore proportioning quantity and then carry
The aluminium hydroxide or aluminium oxide quantum of output of high Bayer process.
The method of the present invention does not need newly-increased Bayer process molten other than the equipment such as newly-increased aluminate hydrates sodium room temperature crystallization process
Go out unit etc. and being obviously improved for existing alumina producer production capacity can be realized, equipment investment is low, and low energy consumption, remarkable in economical benefits.
The severe alkali concentration of adjustment described in step (1) of the present invention to 300g/L or more, such as severe alkali concentration can be 300g/L,
350g/L, 400g/L, 450g/L, 500g/L, 550g/L or 600g/L, preferred severe alkali concentration are 300g/L~600g/L.
Preferably, the slurries that step (1) obtains, molecular proportion are 4~11, for example, can be 4,4.5,5,5.3,5.5,6,
6.5,7,7.5,8,8.5,9,9.2,9.6,10,10.2,10.5,10.8 or 11.
Preferably, temperature used by step (2) the sodium carbonate crystallization process is 80~110 DEG C, such as can be 80
DEG C, 82 DEG C, 85 DEG C, 90 DEG C, 92 DEG C, 95 DEG C, 98 DEG C, 100 DEG C, 102 DEG C, 105 DEG C, 108 DEG C or 110 DEG C；Crystallization time be 1~
3h, such as can be 1h, 1.2h, 1.5h, 2h, 2.2h, 2.5h or 3h.
Preferably, the adjustment of step (3) the severe alkali concentration is carried out by evaporation process, can also use other manner into
Row adjustment, the present invention does not do particular determination for adjustment mode, as long as adjusting its concentration to 350g/L or more.
Preferably, the severe alkali concentration of liquid is 300g/L~600g/L before step (3) described crystallization, such as can be 300g/
L, 350g/L, 400g/L, 450g/L, 500g/L, 550g/L or 600g/L, molecular proportion are 4~11, for example, can be 4,4.2,
4.5,5,5.2,5.5,5.8,6.2,7.4,7.5,8,8.4,9.1,9.2,9.6,10.2,10.6,10.8 or 11.
Preferably, temperature used by step (4) the aluminate hydrates sodium crystallization process is 30~60 DEG C, such as can be
30 DEG C, 32 DEG C, 35 DEG C, 40 DEG C, 45 DEG C, 50 DEG C, 55 DEG C or 60 DEG C；Crystallization time is at least 3h, for example, can be 3h, 5h, 8h,
10h、15h。
The aluminate hydrates sodium crystallization process mild condition that the present invention increases newly, required temperature is only 30~60 DEG C, essentially
Crystallizing at room temperature process, therefore, low for equipment requirements, low energy consumption, and commercial operability is strong.
Preferably, the severe alkali concentration of step (4) described crystalline mother solution is 300g/L~600g/L, such as can be 300g/
L, 350g/L, 400g/L, 450g/L, 500g/L, 550g/L or 600g/L, molecular proportion are 20 or more, for example, can be 20,22,
25,28,30,34,37,40,42,45,50,55 or 58, preferably 25~55.
The piece alkali that the present invention must be supplemented with by using alumina producer is reacted with seed precipitation solution or evaporation mother liquor, is formed high severe
The sodium aluminate liquor of alkali, high molecule ratio does not need to synchronize exclusion carbon alkali by forcing the processes such as effect evaporation that pregnant Bayer liquor can be realized
And its causticization；It also achieves the efficient crystallization process of intermediate products aluminate hydrates sodium, to greatly improve following for dissolution medium
Production capacity under ring efficiency and existing weaponry and equipment.
Preferably, step (5) the crystallization slag part kind divides semen washing, after hot water dissolving, obtains sodium aluminate solution
Then liquid carries out seeded precipitation and aluminum hydroxide precipitation is made again.
Preferably, step (6) crystalline mother solution is mixed with Bayer system evaporation mother liquor, bauxite and lime, then
It is sent into Bayer production process and dissolves out process.
Preferably, step (7) described causticization carries out causticization using milk of lime.
As currently preferred technical solution, the method for the present invention for improving alumina producing Bayer process efficiency, packet
Include following steps：
(1) it uses solid NaOH to mix, react with Bayer system seed precipitation solution or evaporation mother liquor, adjusts severe alkali concentration extremely
300g/L or more, molecular proportion are 4~11；
(2) slurries that step (1) obtains are mixed with sodium carbonate crystal seed, sodium carbonate is carried out at a temperature of 80~110 DEG C
Crystallization process, crystallization time are 1~3h；After crystallization, sodium carbonate slag phase and salt discharge mother liquor are obtained through solid-liquor separation；
(3) severe alkali concentration is adjusted into severe alkali concentration to 350g/L is not less than less than the salt discharge mother liquor of 350g/L, obtains severe alkali
Concentration is in 350g/L or more, molecular proportion liquid before 4~11 crystallization；
(4) liquid carries out aluminate hydrates sodium crystallization process at a temperature of 30~60 DEG C before the crystallization for obtaining step (3), knot
The brilliant time is at least 3h；After crystallization, it is 300g/L~600g/L, molecule to obtain crystal slag and severe alkali concentration through solid-liquor separation
Than the crystalline mother solution for 20 or more；
(5) divide the crystal slag part kind that step (4) obtains to semen washing, after hot water dissolving, obtain sodium aluminate solution
Then liquid carries out seeded precipitation and aluminum hydroxide precipitation is made again；
(6) crystalline mother solution that step (4) obtains is mixed with Bayer system evaporation mother liquor, bauxite and lime, then
It is sent into Bayer production process and dissolves out process, then obtain Bayer Process digestion slurry, through diluting desiliconization, refined, decomposable process, obtain
Aluminum hydroxide precipitation；
(7) milk of lime causticization is used after the sodium carbonate slag phase dissolving obtained step (2), NaOH solution and causticization slag is made,
NaOH solution is sent into Bayer dissolution process and removes dissolving bauxite.
Compared with prior art, the present invention at least has the advantages that：
(1) efficient coupling of the present invention Bayer process aluminum oxide production process existing benefit alkali process and aluminate hydrates sodium are efficient
High severe alkali, high molecule ratio sodium aluminate solution is made by newly-increased aluminate hydrates sodium crystallization process in crystallization process, can be by Bayer process
Medium circulation efficiency improves 1.5% or more, and economic benefit is apparent；
(2) the present invention newly-increased same output aluminium hydroxide of aluminate hydrates sodium crystallization process or alumina product, Ke Yi
It does not input under the premise of the substance or energy unrelated with existing Bayer system, realizes the raising of Bayer process production capacity；
(3) present invention does not need setting forced evaporation salt discharge process, you can realizes in pregnant Bayer liquor the exclusion of sodium carbonate and severe
Change, saves relevant device investment and energy consumption；
(4) present device investment is low, comprehensive energy consumption is horizontal low, and industry is handling good；
(5) of the invention alumina product and the alumina product of existing Bayer process are identical in quality, without any newly-increased exhaust gas,
Waste liquid or solid waste generate, energy conservation and environmental protection.
Description of the drawings
Fig. 1 is the process flow chart of the method provided by the present invention for improving alumina producing Bayer process effect.
The present invention is described in more detail below.But following examples is only the simple example of the present invention, not generation
Table or limitation the scope of the present invention, protection scope of the present invention are subject to claims.
Specific implementation mode
Technical solution to further illustrate the present invention below with reference to the accompanying drawings and specific embodiments.
Fig. 1 shows the process flow chart of the method for the present invention for improving alumina producing Bayer process effect, tool
Body includes the following steps：
(1) it uses solid NaOH to mix, react with Bayer system seed precipitation solution or evaporation mother liquor, adjusts severe alkali concentration extremely
300g/L or more；
(2) slurries that step (1) obtains are mixed with sodium carbonate crystal seed, carries out sodium carbonate crystallization process；After crystallization,
Sodium carbonate slag phase and salt discharge mother liquor are obtained through solid-liquor separation；
(3) severe alkali concentration is adjusted into severe alkali concentration to 350g/L is not less than less than the salt discharge mother liquor of 350g/L, is crystallized
Preceding liquid；
(4) liquid carries out aluminate hydrates sodium crystallization process before the crystallization for obtaining step (3)；After crystallization, divide admittedly through liquid
From obtaining crystal slag and crystalline mother solution；
(5) the crystal slag for obtaining step (4) dissolves, and send to Bayer production process and dilutes desiliconization process, is then planted
Divide process, obtains aluminum hydroxide precipitation；
(6) crystalline mother solution for obtaining step (4) is sent into Bayer production process and dissolves out process, then obtains Bayer Process digestion
Slurry obtains aluminum hydroxide precipitation through diluting desiliconization, refined, decomposable process；
(7) causticization after the sodium carbonate slag phase dissolving obtained step (2), is made NaOH solution and causticization slag, NaOH solution
It is sent into Bayer dissolution process and removes dissolving bauxite.
Of the invention for ease of understanding, it is as follows that the present invention enumerates embodiment.Those skilled in the art are it will be clearly understood that the implementation
Example is only to aid in the understanding present invention, should not be regarded as a specific limitation of the invention.
Embodiment 1
A kind of method improving alumina producing Bayer process efficiency is present embodiments provided, with certain Bayer process alumina producer
Seed precipitation solution is raw material, and the mother liquor of the alumina producer mainly forms (g/L, similarly hereinafter) as described in Table 1.
Table 1
Its production process, includes the following steps：
(1) seed precipitation solution is mixed with solid NaOH, is deployed into liquid phase Na2OkA concentration of 400g/L, molecular proportion are 5.5
Sodium carbonate filter cake and Na is obtained by filtration with sodium carbonate crystal seed salt discharge 3 hours at 100 DEG C in slurry2OkA concentration of 400g/L, molecule
Than liquid before the crystallization for 5.5；
(2) by Na2OkLiquid is cooled to 45 DEG C, crystallizes 15 hours before a concentration of 400g/L, the crystallization that molecular proportion is 5.5, obtains
Aluminate hydrates sodium filter cake and severe alkali concentration 395g/L, the crystalline mother solution that molecular proportion is 25；
(3) aluminate hydrates sodium filter cake is washed, with after hot water dissolving with part seed precipitation solution, obtains Na2OkIt is a concentration of
Then 175g/L, the sodium aluminate solution that molecular proportion is 1.46 carry out seeded precipitation and aluminium hydroxide are made；
(4) it on the basis of certain total severe alkali quality, is imitated with severe alkali concentration 395g/L, the crystalline mother solution that molecular proportion is 25 and A
After evaporating mother liquor mixing, Bayer Process digestion process is carried out with diaspore ore etc., the front and back concentration of conversion dissolution medium dissolution becomes
Change, it is 167.5kg/m that medium circulation efficiency, which is calculated,3；
(5) milk of lime causticization is used after the sodium carbonate filter cake dissolving obtained step (1), NaOH solution and causticization slag is made,
NaOH solution is sent into Bayer dissolution process and removes dissolving bauxite.
Embodiment 2：
A kind of method improving alumina producing Bayer process efficiency is present embodiments provided, with certain Bayer process described in table 1
The evaporation mother liquor of alumina producer is raw material, and production process is as described below：
(1) A is imitated evaporation mother liquor to mix with solid NaOH, is deployed into liquid phase Na2OkA concentration of 500g/L, molecular proportion 7.7
Slurry sodium carbonate filter cake and Na is obtained by filtration with sodium carbonate crystal seed salt discharge 3 hours at 100 DEG C2OkA concentration of 500g/L, divide
Son ratio is liquid before 7.7 crystallization；
(2) by Na2OkLiquid is cooled to 60 DEG C, crystallizes 5 hours before a concentration of 500g/L, the crystallization that molecular proportion is 7.7, obtains
Aluminate hydrates sodium filter cake and severe alkali concentration 492g/L, the crystalline mother solution that molecular proportion is 37；
(3) aluminate hydrates sodium filter cake is washed, with after hot water dissolving with part seed precipitation solution, obtains Na2OkIt is a concentration of
Then 175g/L, the sodium aluminate solution that molecular proportion is 1.45 carry out seeded precipitation and aluminium hydroxide are made；
(4) it on the basis of certain total severe alkali quality, is imitated with severe alkali concentration 492g/L, the crystalline mother solution that molecular proportion is 37 and A
After evaporating mother liquor mixing, Bayer Process digestion process is carried out with diaspore ore etc., the front and back concentration of conversion dissolution medium dissolution becomes
Change, it is 167.6kg/m that medium circulation efficiency, which is calculated,3；
(5) milk of lime causticization is used after the sodium carbonate filter cake dissolving obtained step (1), NaOH solution and causticization slag is made,
NaOH solution is sent into Bayer dissolution process and removes dissolving bauxite.
Embodiment 3：
A kind of method improving alumina producing Bayer process efficiency is present embodiments provided, with certain Bayer process described in table 1
The evaporation mother liquor of alumina producer is raw material, and production process is as described below：
(1) B is imitated evaporation mother liquor to mix with solid NaOH, is deployed into liquid phase Na2OkA concentration of 600g/L, molecular proportion are
Sodium carbonate filter cake and Na is obtained by filtration with sodium carbonate crystal seed salt discharge 3 hours at 100 DEG C in 10.6 slurry2OkA concentration of 600g/
L, liquid before the crystallization that molecular proportion is 10.6；
(2) by Na2OkLiquid is cooled to 50 DEG C, crystallizes 10 hours before a concentration of 600g/L, the crystallization that molecular proportion is 10.6, obtains
To aluminate hydrates sodium filter cake and severe alkali concentration 583g/L, the crystalline mother solution that molecular proportion is 42；
(3) aluminate hydrates sodium filter cake is washed, with after hot water dissolving with part seed precipitation solution, obtains Na2OkIt is a concentration of
Then 175g/L, the sodium aluminate solution that molecular proportion is 1.46 carry out seeded precipitation and aluminium hydroxide are made；
(4) it on the basis of certain total severe alkali quality, is imitated with severe alkali concentration 583g/L, the crystalline mother solution that molecular proportion is 42 and A
After evaporating mother liquor mixing, Bayer Process digestion process is carried out with diaspore ore etc., the front and back concentration of conversion dissolution medium dissolution becomes
Change, it is 167.9kg/m that medium circulation efficiency, which is calculated,3；
(5) milk of lime causticization is used after the sodium carbonate filter cake dissolving obtained step (1), NaOH solution and causticization slag is made,
NaOH solution is sent into Bayer dissolution process and removes dissolving bauxite.
Embodiment 4：
A kind of method improving alumina producing Bayer process efficiency is present embodiments provided, with certain Bayer process described in table 1
The seed precipitation solution of alumina producer is raw material, and production process is as described below：
(1) seed precipitation solution and solid NaOH are mixed into liquid phase Na2OkA concentration of 300g/L, the slurry that molecular proportion is 4.2,
With sodium carbonate crystal seed salt discharge 3 hours at 100 DEG C, sodium carbonate filter cake and Na is obtained by filtration2OkA concentration of 300g/L, molecular proportion are
4.2 salt discharge filtrate；
(2) by Na2OkA concentration of 300g/L, the salt discharge filtrate that molecular proportion is 4.2 are evaporated to Na2OkA concentration of 550g/L, divide
Son ratio is liquid before 4.2 crystallization；
(3) by Na2OkLiquid is cooled to 45 DEG C, crystallizes 30 hours before a concentration of 550g/L, the crystallization that molecular proportion is 4.2, obtains
Aluminate hydrates sodium filter cake and severe alkali concentration 538g/L, the crystalline mother solution that molecular proportion is 55；
(4) aluminate hydrates sodium filter cake is washed, with after hot water dissolving with part seed precipitation solution, obtains Na2OkIt is a concentration of
Then 175g/L, the sodium aluminate solution that molecular proportion is 1.45 carry out seeded precipitation and aluminium hydroxide are made；
(5) it on the basis of certain total severe alkali quality, is imitated with severe alkali concentration 538g/L, the crystalline mother solution that molecular proportion is 55 and A
After evaporating mother liquor mixing, Bayer Process digestion process is carried out with diaspore ore etc., the front and back concentration of conversion dissolution medium dissolution becomes
Change, it is 177.8kg/m that medium circulation efficiency, which is calculated,3；
(6) milk of lime causticization is used after the sodium carbonate filter cake dissolving obtained step (1), NaOH solution and causticization slag is made,
NaOH solution is sent into Bayer dissolution process and removes dissolving bauxite.
Comparative example 1：
Using the seed precipitation solution of certain Bayer process alumina producer described in table 1 as raw material, using alumina producing Bayer process, life
Production process is as described below：
(1) it takes A effect evaporation mother liquors in part to enter pressure effect evaporator evaporation, obtains forcing effect mother liquor after salt discharge；
(2) mother liquor is imitated into the pressure obtained by part A effect evaporations mother liquor, step (1) and system requires supplementation with solid NaOH and mixes
It closes, Bayer process circulating mother liquor, Na is made2OkA concentration of 245g/L, molecular proportion 3.38；
(3) circulating mother liquor, diaspore ore made from mixing step (2) etc. carry out Bayer Process digestion process, and conversion is molten
Go out the front and back concentration variation of medium dissolution, it is 165.0kg/m that circulating mother liquor cycle efficieny, which is calculated,3；
(4) milk of lime causticization is used after the sodium carbonate filter cake dissolving obtained step (1), NaOH solution and causticization slag is made,
NaOH solution is sent into Bayer dissolution process and removes dissolving bauxite.
The circulating mother liquor being calculated in medium circulation efficiency that Examples 1 to 4 is calculated and comparative example 1 is recycled and is imitated
Rate show that embodiment 1 improves 1.52% compared with the Bayer process medium circulation efficiency of comparative example 1 after being compared；Embodiment 2 is more right
The Bayer process medium circulation efficiency of ratio 1 improves 1.58%；Embodiment 3 is carried compared with the Bayer process medium circulation efficiency of comparative example 1
It is high by 1.76%；Embodiment 4 improves 7.76% compared with the Bayer process medium circulation efficiency of comparative example 1.
It can be obtained by the above results, the piece alkali and Bayer-process seed-separating mother liquor that the present invention must be supplemented with using alumina producer
Or evaporation mother liquor reaction, high severe alkali, high molecule ratio sodium aluminate solution are formed, is not needed by forcing the processes such as effect evaporation can be realized
Pregnant Bayer liquor excludes carbon alkali and its causticization；By realizing the efficient crystallization process of intermediate products aluminate hydrates sodium, effectively increase
The cycle efficieny of dissolution medium.
Applicant states that the present invention illustrates the detailed construction feature of the present invention by above-described embodiment, but the present invention is simultaneously
It is not limited to above-mentioned detailed construction feature, that is, does not mean that the present invention has to rely on above-mentioned detailed construction feature and could implement.Institute
Belong to those skilled in the art it will be clearly understood that any improvement in the present invention, to the equivalence replacement of component selected by the present invention
And the increase of accessory, the selection etc. of concrete mode, it all falls within protection scope of the present invention and the open scope.
Claims (7)
1. a kind of method improving alumina producing Bayer process efficiency, which is characterized in that include the following steps：
(1) solid NaOH and Bayer system seed precipitation solution or evaporation mother liquor is used to mix, react, adjust severe alkali concentration to 300g/L with
On；
(2) slurries that step (1) obtains are mixed with sodium carbonate crystal seed, carries out sodium carbonate crystallization process；After crystallization, through liquid
Gu isolated sodium carbonate slag phase and salt discharge mother liquor；
(3) severe alkali concentration is adjusted into severe alkali concentration to 350g/L is not less than less than the salt discharge mother liquor of 350g/L, obtains crystallizing preceding liquid；
(4) liquid carries out aluminate hydrates sodium crystallization process before the crystallization for obtaining step (3)；After crystallization, obtained through solid-liquor separation
To crystal slag and crystalline mother solution；
(5) the crystal slag for obtaining step (4) dissolves, and send to Bayer production process and dilutes desiliconization process, then carries out kind and divided
Journey obtains aluminum hydroxide precipitation；
(6) crystalline mother solution for obtaining step (4) is sent into Bayer production process and dissolves out process, then obtains Bayer Process digestion material
Slurry obtains aluminum hydroxide precipitation through diluting desiliconization, refined, decomposable process；
(7) causticization after the sodium carbonate slag phase dissolving obtained step (2), is made NaOH solution and causticization slag, and NaOH solution is sent into
Bayer dissolution process removes dissolving bauxite.
2. the method as described in claim 1, which is characterized in that step (1) the severe alkali concentration is 300g/L~600g/L；
Preferably, the slurries that step (1) obtains, molecular proportion are 4~11.
3. method as claimed in claim 1 or 2, which is characterized in that warm used by step (2) the sodium carbonate crystallization process
Degree is 80~110 DEG C；Crystallization time is 1~3h；
Preferably, the adjustment of step (3) the severe alkali concentration is carried out by evaporation process；
Preferably, the severe alkali concentration of liquid is 300g/L~600g/L before step (3) described crystallization, and molecular proportion is 4~11.
4. the method as described in one of claim 1-3, which is characterized in that step (4) the aluminate hydrates sodium crystallization process institute
The temperature used is 30~60 DEG C；Crystallization time is at least 3h；
Preferably, the severe alkali concentration of the crystalline mother solution be 300g/L~600g/L, molecular proportion be 20 or more, preferably 25~
55。
5. the method as described in one of claim 1-4, which is characterized in that step (5) the crystallization slag part kind divides sperm
Washing, after hot water dissolving, obtains sodium aluminate solution, then carries out seeded precipitation again and aluminum hydroxide precipitation is made.
6. the method as described in one of claim 1-5, which is characterized in that step (6) crystalline mother solution is steamed with Bayer system
Hair mother liquor, bauxite and lime are mixed, and Bayer production process dissolution process is re-fed into；
Preferably, step (7) described causticization carries out causticization using milk of lime.
7. the method as described in one of claim 1-6, which is characterized in that the described method comprises the following steps：
(1) solid NaOH and Bayer system seed precipitation solution or evaporation mother liquor is used to mix, react, adjust severe alkali concentration to 300g/L with
On, molecular proportion is 4~11；
(2) slurries that step (1) obtains are mixed with sodium carbonate crystal seed, sodium carbonate crystallization is carried out at a temperature of 80~110 DEG C
Process, crystallization time are 1~3h；After crystallization, sodium carbonate slag phase and salt discharge mother liquor are obtained through solid-liquor separation；
(3) severe alkali concentration is adjusted into severe alkali concentration to 350g/L is not less than less than the salt discharge mother liquor of 350g/L, obtains severe alkali concentration
In 350g/L or more, molecular proportion liquid before 4~11 crystallization；
(4) liquid carries out aluminate hydrates sodium crystallization process at a temperature of 30~60 DEG C before the crystallization for obtaining step (3), when crystallization
Between be at least 3h；After crystallization, it is 300g/L~600g/L to obtain crystal slag and severe alkali concentration through solid-liquor separation, and molecular proportion is
20 or more crystalline mother solution；
(5) divide the crystal slag part kind that step (4) obtains to semen washing, after hot water dissolving, obtain sodium aluminate solution, so
It carries out seeded precipitation again afterwards and aluminum hydroxide precipitation is made；
(6) crystalline mother solution that step (4) obtains is mixed with Bayer system evaporation mother liquor, bauxite and lime, is re-fed into
Bayer production process dissolves out process, then obtains Bayer Process digestion slurry, through diluting desiliconization, refined, decomposable process, obtains hydrogen-oxygen
Change aluminum precipitation；
(7) milk of lime causticization is used after the sodium carbonate slag phase dissolving obtained step (2), NaOH solution and causticization slag, NaOH is made
Solution is sent into Bayer dissolution process and removes dissolving bauxite.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111252790A (en) * | 2020-03-16 | 2020-06-09 | 中国铝业股份有限公司 | Improved method for evaporation and salting-out process of Bayer process high-carbon alkali solution |
| CN113104873A (en) * | 2021-03-31 | 2021-07-13 | 中铝集团山西交口兴华科技股份有限公司 | Device for removing sodium oxalate in production flow of alumina and fine alumina |
| CN113165028A (en) * | 2018-12-27 | 2021-07-23 | 巴西利亚铝业公司 | Aluminum recovery method |
| CN113912093A (en) * | 2021-09-29 | 2022-01-11 | 靖西天桂铝业有限公司 | Method for thickening evaporation mother liquor and discharging sodium carbonate salt in aluminum oxide production |
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| CN1597528A (en) * | 2004-05-14 | 2005-03-23 | 中国铝业股份有限公司 | Carbon decomposed mother liquor high concentration crystallization evaporation method |
| CN103332714A (en) * | 2013-07-05 | 2013-10-02 | 云南文山铝业有限公司 | Method used for reducing sodium carbonate content of low evaporation mother liquor |
| CN105776268A (en) * | 2016-02-06 | 2016-07-20 | 杭州锦江集团有限公司 | Drying firing method taking fly ash as raw material |
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| CN1597528A (en) * | 2004-05-14 | 2005-03-23 | 中国铝业股份有限公司 | Carbon decomposed mother liquor high concentration crystallization evaporation method |
| CN103332714A (en) * | 2013-07-05 | 2013-10-02 | 云南文山铝业有限公司 | Method used for reducing sodium carbonate content of low evaporation mother liquor |
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Cited By (4)
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| CN113165028A (en) * | 2018-12-27 | 2021-07-23 | 巴西利亚铝业公司 | Aluminum recovery method |
| CN111252790A (en) * | 2020-03-16 | 2020-06-09 | 中国铝业股份有限公司 | Improved method for evaporation and salting-out process of Bayer process high-carbon alkali solution |
| CN113104873A (en) * | 2021-03-31 | 2021-07-13 | 中铝集团山西交口兴华科技股份有限公司 | Device for removing sodium oxalate in production flow of alumina and fine alumina |
| CN113912093A (en) * | 2021-09-29 | 2022-01-11 | 靖西天桂铝业有限公司 | Method for thickening evaporation mother liquor and discharging sodium carbonate salt in aluminum oxide production |
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