CN101348270A - Mixing desiliconisation process by combination method - Google Patents
Mixing desiliconisation process by combination method Download PDFInfo
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- CN101348270A CN101348270A CN 200710012144 CN200710012144A CN101348270A CN 101348270 A CN101348270 A CN 101348270A CN 200710012144 CN200710012144 CN 200710012144 CN 200710012144 A CN200710012144 A CN 200710012144A CN 101348270 A CN101348270 A CN 101348270A
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Abstract
The invention relates to a desiliconization process, in particular to a combination-method compound desiliconization process. The desiliconization process comprises the following steps: all or partial crude liquid by the sintering process is added to a Bayer process system and is dissolved out by use of a Bayer process, and then a large amount of fresh red mud in slurry is used as desiliconization seed; a large amount of heat contained in the slurry is used as a heat source; and desilication reaction is finished through mixing. Compared with the prior production flow, the desiliconization process simplifies the production flow, raises the heat utilization efficiency of a Bayer-process dissolution system, simplifies the process flow, saves energy, reduces consumption, decreases seed precipitation seminal fluid alpha, k, and raises the decomposition rate of seed precipitation.
Description
Technical field
The present invention relates to a kind of desilication process, relate in particular to a kind of all or part of crude liquor used sinter method and enter the Bayer process digestion series, mix according to a certain percentage, carry out the mixing desiliconisation process by combination method of desiliconization jointly with Bayer process stripping rear slurry.
Background technology
Integrated process output accounts for more than 60% of alumina product ultimate production in the alumina producing, exist two desiliconization process in the existing integrated process alumina producing: one is that the ore pulp of Bayer process system itself is after the pre-desiliconization of raw pulp, again through flow processs such as stripping, dilution, separation carry out from desiliconization, its siliceous modulus in sintering section by bayer process can reach more than 250, can satisfy the needs that kind of branch decomposes, obtain fine aluminium hydroxide product.Another is exactly a sintering process system with white residue or Bayer process red mud as the desiliconization seed, adjusts the α of desiliconization dope with seed precipitation solution
K, adopting live steam is the direct heating or the indirect heating pressurization desiliconization of thermal source.Its sintering process kind divides the seminal fluid siliceous modulus can reach more than 250, and carbon divides the seminal fluid siliceous modulus can reach more than 600, can satisfy the sintering process kind and divide decomposition and carbon to divide the needs that decompose.
There is following shortcoming in existing integrated process desilication process:
1, there are two cover desiliconization systems in technical process complexity as mentioned above.
2, process for desiliconizing crude liquid obtained by sinter processing apparatus production capacity is limited, becomes the bottleneck that product is carried by the old factory of restriction.
3, the Bayer process digestion series generally is to adopt multistage self-evaporatint n. cooling in order to reclaim the heat in the stripping slurries, and flash distillation secondary vapour removes preheating low temperature raw pulp.But in this kind method, the secondary vapour parameter that flash distillation is come out is lower, and with respect to adopting live steam to conduct heat to raw pulp, required heat interchanging area is big.
4, in the mixed combining method system, the steam consumption of desiliconization process accounts for more than 10% of total energy consumption, is one of main power consumption operation.
Summary of the invention
The invention provides a kind of mixing desiliconisation process by combination method for solving the problems of the technologies described above, purpose is that crude liquor used sinter method is mixed with Bayer process stripping rear slurry, simplifies technical process, and is energy-saving and cost-reducing, improves the efficiency of utilization of Bayer process digestion series, reduces to plant and divides seminal fluid α
K, improve kind of a branch rate of decomposition.
A kind of mixing desiliconisation process by combination method, it comprises the steps: crude liquor used sinter method is joined in the Bayer process system, utilize red muds fresh in a large number in the Bayer process stripping rear slurry as the desiliconization seed, a large amount of heats that contain in the slurries can be finished the mixing desiliconization as thermal source.
It is all or part of crude liquor used sinter method to be joined in the flash-pot of Bayer process system mix with Bayer process stripping rear slurry that described crude liquor used sinter method joins in the Bayer process system, enters the red mud separating, washing operation through dilution trap, dilution pit again.
Described crude liquor used sinter method is joined in the flash-pot is that the thick liquid of the method for partially sintering is joined different flash-pots by two flow processs.
It is the thick liquid of the method for partially sintering to be joined in the flash-pot, dilution trap of Bayer process system or the dilution pit mix with Bayer process stripping rear slurry that described crude liquor used sinter method joins in the Bayer process system, enters the red mud separating, washing operation then.
The temperature of described mixed solution is 140～180 ℃, the desiliconization of pressurizeing, and pressure is 0.7～1.1Mpa.
The temperature of described mixed solution is 90～115 ℃, carries out atmospheric silicon removing.
The described blended residence time is 0.5～8h.
Add lime in the solution of described mixing back, making siliceous modulus is 600～1500.
The ratio of mixture of described crude liquor used sinter method and Bayer process stripping rear slurry is 3～7: 7.
It is crude liquor used sinter method to be joined in the dilution trap of Bayer process system mix that described crude liquor used sinter method joins in the Bayer process system, enters the red mud separating, washing operation again.
Described crude liquor used sinter method is joined in the dilution trap is that crude liquor used sinter method is joined dilution trap by pipeline.
Described crude liquor used sinter method is joined in the dilution pit is all or part of crude liquor used sinter method to be sent into the atmospheric silicon removing groove earlier carry out entering in the dilution pit behind the atmospheric silicon removing again.
The siliceous modulus of described atmospheric silicon removing is about 150～600.
Described mixing back solution temperature is 90～115 ℃.
Seed concentration during described the mixing is 30～80g/L.
The described blended residence time is 3～8h.
Described mixed discharging siliceous modulus is 200～350.
The ratio of mixture of described crude liquor used sinter method and Bayer process stripping rear slurry is 0.5～4: 7.
Add lime in the solution of described mixing back, making siliceous modulus is 600～1500.
Principle of the present invention is as follows:
All or part of crude liquor used sinter method is directly sent into the Bayer process system, utilize red muds fresh in a large number in the Bayer process stripping rear slurry as the desiliconization seed, a large amount of heat that contains in the slurries can be finished desilication reaction as thermal source.
The nucleus of contained sodium white residue is the same in the sodium white residue that crude liquor used sinter method is separated out in desiliconization process and the Bayer process red mud, and other physicochemical property are also similar.Therefore, crude liquor used sinter method mixes with bayer process ' s digested slurry, utilizes the bayer process ' s digested slurry of the crude liquor used sinter method diluting high-concentration of lower concentration exactly, also utilizes the high temperature of dissolved mineral slurry and fresh and competent Bayer process red mud to do the desiliconization seed simultaneously.Make that silicon-dioxide removes fast in the mixed solution, reach desiliconizing crude liquid obtained purpose.So crude liquor used sinter method mixes the prerequisite that possesses sodium aluminate solution desilicification with bayer process ' s digested slurry.
Mixing temperature that the back reached, different desiliconization conditions such as contain admittedly according to crude liquor used sinter method and Bayer process stripping rear slurry, cause different desiliconization mechanisms, below is the different blended chalaza:
1, mix at flash-pot, mixeding liquid temperature is 140～180 ℃, promptly basic satisfied pressurization desiliconization condition;
2, mix at flash-pot, 90～115 ℃ of mixeding liquid temperatures promptly satisfy the atmospheric silicon removing condition substantially;
3, mix at dilution trap, need additionally add heat, reach the atmospheric silicon removing condition, promptly mixeding liquid temperature is 90～115 ℃.
4, all or part of crude liquor used sinter method enters the dilution pit then and mixes with the stripping rear slurry earlier through atmospheric silicon removing, finishes desilication reaction.
Crude liquor used sinter method mixes with Bayer process stripping rear slurry, if mixing point at flash-pot, ratio of mixture generally should be not more than 3: 7; If mixing point is at dilution trap, ratio of mixture can suitably increase.
Advantage of the present invention and effect are as follows:
The crude liquor used sinter method of lower concentration mixes with the dissolved mineral slurry of high density, has played the diluting effect to the Bayer process dissolution fluid equally, has reduced the amount of water of Bayer process washing system, thereby has alleviated evaporation burden, has reduced the evaporation steam consumption; Reduced to plant and divided seminal fluid α
k, improved and planted the branch rate of decomposition, help producing sandy alumina.
Because crude liquor used sinter method has been joined in the flash-pot of Bayer process system, shunted the thick liquid of the method for partially sintering, alleviated the machine utilization of sintering process desiliconization system significantly, improved the handling capacity of sintering process system; Crude liquor used sinter method mixes with ore pulp after the stripping, utilized the low parameter waste heat of stripping rear slurry by direct mixing, although the live steam consumption of Bayer process part will rise (the live steam consumption of sintering process desiliconization descends simultaneously), the heat-exchange equipment of required Bayer process part will reduce.
Crude liquor used sinter method has been joined in the dilution pit of Bayer process system, simplified the series process flow process, reduced the desiliconization energy consumption; Crude liquor used sinter method is carried out atmospheric silicon removing earlier, can effectively guarantee mixed siliceous modulus, to the influence of whole process of production operation, stablized service temperature when reducing owing to the Bayer process change of production.
In mixed solution, add lime, can effectively guarantee mixed siliceous modulus, and, be admitted to the sintering process system batching and reclaimed by native system with the aluminum oxide that the tricalcium aluminate form is lost.
Mix the production technology level that the desiliconization The Application of Technology can improve integrated process, the simplified process equipment flow process reduces the production process energy consumption, solves the existing problem of process for desiliconizing crude liquid obtained by sinter part, realizes good economic benefit.
Description of drawings
Fig. 1 is a process flow sheet of the present invention.
In the accompanying drawing: 1, digester; 2, flash-pot; 3, dilution trap; 4, dilution pit; 5, red mud separation circuit; 6, atmospheric silicon removing groove.
Embodiment
The present invention will be further described below in conjunction with accompanying drawing, but protection scope of the present invention is not limit by embodiment.
As shown in Figure 1, mixing desiliconisation process by combination method of the present invention is that crude liquor used sinter method is joined in the Bayer process system, utilize red muds fresh in a large number in the Bayer process stripping rear slurry as the desiliconization seed, the a large amount of heats that contain in the slurries stop certain hour as thermal source, can finish desilication reaction.
Embodiment 1:
With the method for crude liquor used sinter method with Bayer process stripping rear slurry mixing desiliconization, the ore pulp of Bayer process system enters into flash-pot 2 through digester 1, enters dilution trap 3, dilution pit 4 more successively, enters red mud separating, washing operation 5 at last; The thick liquid of the method that partially sinters enters along a or b two flow processs in the flash-pot 2 of Bayer process system and mixes, and again through dilution trap 3, enters the red mud separating, washing operation behind the dilution pit 4.
When the temperature of mixed solution is 140～180 ℃, what carry out is the pressurization desiliconization, and pressure is 0.7～1.1Mpa, and the blended residence time is 0.5～1h; When the temperature of mixed solution is 90～115 ℃, what carry out is atmospheric silicon removing, and the blended residence time is 3～8h; Add lime in the solution of described mixing back, making siliceous modulus is 600～1500.
The ratio of mixture of above-mentioned crude liquor used sinter method and Bayer process stripping rear slurry is 3～7: 7.
Embodiment 2:
The thick liquid of the method that partially sinters described in the embodiment 1 mixes in the b flow process enters the flash-pot 2 of Bayer process system respectively, through dilution trap 3, dilution pit 4 enters red mud separating, washing operation 5 and substituted by following step: the thick liquid of the method that partially sinters enters along the c flow process in the dilution trap 3 of Bayer process system and mixes, add a part of live steam, reach with embodiment 1 in after the condition of b flow process, enter red mud separating, washing operation 5 through dilution pit 4 again.
Embodiment 3:
With the method for crude liquor used sinter method with Bayer process stripping rear slurry mixing desiliconization, the slip in the Bayer process system enters into flash-pot 2 through digester 1, enters dilution trap 3, dilution pit 4 more successively, enters red mud separating, washing operation 5 at last; After all or part of crude liquor used sinter method sent into atmospheric silicon removing groove 6 earlier and carry out atmospheric silicon removing, siliceous modulus was about 150～600, enters dilution pit 4 through the d flow process again and mixes with Bayer process stripping rear slurry, enters red mud separating, washing operation 5.
Solution temperature is 90～115 ℃ after the above-mentioned mixing; Seed concentration during mixing is 30～80g/L; The blended residence time is 3～8h; Mixed discharging siliceous modulus is 200～350; The ratio of mixture of crude liquor used sinter method and Bayer process stripping rear slurry is 0.5～4: 7.
After mixing, add lime in the solution, make siliceous modulus reach 600～1500.
Claims (19)
1, a kind of mixing desiliconisation process by combination method, it is characterized in that it comprises the steps: all or part of crude liquor used sinter method is joined in the Bayer process system, utilize red muds fresh in a large number in the Bayer process stripping rear slurry as the desiliconization seed, the a large amount of heat that contains in the slurries is finished desilication reaction as thermal source.
2, mixing desiliconisation process by combination method according to claim 1, it is characterized in that it is crude liquor used sinter method to be joined in the flash-pot of Bayer process system mix with Bayer process stripping rear slurry that described crude liquor used sinter method joins in the Bayer process system, enters red mud separating, washing operation (5) through dilution trap (3), dilution pit (4) again.
3, mixing desiliconisation process by combination method according to claim 2, it is characterized in that crude liquor used sinter method is joined in the flash-pot (2) is that the thick liquid of the method for partially sintering is joined in the different flash-pots by two kinds of flow processs.
4, mixing desiliconisation process by combination method according to claim 1, it is characterized in that it is the thick liquid of the method for partially sintering to be joined in the dilution trap (3) of Bayer process system mix with Bayer process stripping rear slurry that described crude liquor used sinter method joins in the Bayer process system, enters red mud separating, washing operation (5) through dilution pit (4) again.
5, the described mixing desiliconisation process by combination method of claim 2 is characterized in that the temperature of described mixed solution is 140～180 ℃, the desiliconization of pressurizeing, and pressure is 0.7～1.1Mpa.
6, claim 2 or 4 described mixing desiliconisation process by combination method, the temperature that it is characterized in that described mixed solution is 90～115 ℃, carries out atmospheric silicon removing.
7, the described mixing desiliconisation process by combination method of claim 2 is characterized in that the described blended residence time is 0.5～1h.
8, claim 2 or 4 described mixing desiliconisation process by combination method is characterized in that the described blended residence time is 3～8h.
9, claim 2 or 4 described mixing desiliconisation process by combination method is characterized in that adding lime in the solution of described mixing back, and making siliceous modulus is 600～1500.
10, claim 1,2 or 4 described mixing desiliconisation process by combination method is characterized in that the ratio of mixture of described crude liquor used sinter method and Bayer process stripping rear slurry is 3～7: 7.
11, mixing desiliconisation process by combination method according to claim 1, it is characterized in that it is middle mixing of dilution pit (4) that crude liquor used sinter method is joined the Bayer process system that described crude liquor used sinter method joins in the Bayer process system, enters the red mud separating, washing operation again.
12, mixing desiliconisation process by combination method according to claim 11, it is characterized in that described with crude liquor used sinter method join dilution pit (5) be all or part of crude liquor used sinter method is sent into atmospheric silicon removing groove (6) earlier and is carried out atmospheric silicon removing after, enter again in the dilution pit (5).
13, mixing desiliconisation process by combination method according to claim 12, the siliceous modulus that it is characterized in that described atmospheric silicon removing is about 150～600.
14, mixing desiliconisation process by combination method according to claim 11 is characterized in that described mixing back solution temperature is 90～115 ℃.
15, mixing desiliconisation process by combination method according to claim 11, the seed concentration when it is characterized in that described the mixing is 30～80g/L.
16, mixing desiliconisation process by combination method according to claim 11 is characterized in that the described blended residence time is 3～8h.
17, mixing desiliconisation process by combination method according to claim 11 is characterized in that described mixed discharging siliceous modulus is 200～350.
18, mixing desiliconisation process by combination method according to claim 11 is characterized in that the ratio of mixture of described crude liquor used sinter method and Bayer process stripping rear slurry is 0.5～4: 7.
19, mixing desiliconisation process by combination method according to claim 10 is characterized in that adding lime in the solution of described mixing back, and making siliceous modulus is 600～1500.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103848452A (en) * | 2014-02-25 | 2014-06-11 | 湖南中大冶金设计有限公司 | Simple treatment method of Bayer-process red mud and sintering-process silicon slag in aluminum oxide production by series process |
| CN115321567A (en) * | 2022-08-16 | 2022-11-11 | 中国铝业股份有限公司 | Method for improving silicon content index of sodium aluminate solution in low-temperature Bayer process |
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2007
- 2007-07-17 CN CN 200710012144 patent/CN101348270A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103848452A (en) * | 2014-02-25 | 2014-06-11 | 湖南中大冶金设计有限公司 | Simple treatment method of Bayer-process red mud and sintering-process silicon slag in aluminum oxide production by series process |
| CN103848452B (en) * | 2014-02-25 | 2015-10-07 | 湖南中大冶金设计有限公司 | The Simple treatment method of Bayer process red mud and silica residue in sinter process in producing alumina through series process |
| CN115321567A (en) * | 2022-08-16 | 2022-11-11 | 中国铝业股份有限公司 | Method for improving silicon content index of sodium aluminate solution in low-temperature Bayer process |
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Open date: 20090121 |