CN101348272B - Application process for drying aluminium hydroxide fines - Google Patents
Application process for drying aluminium hydroxide fines Download PDFInfo
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- CN101348272B CN101348272B CN2008101412253A CN200810141225A CN101348272B CN 101348272 B CN101348272 B CN 101348272B CN 2008101412253 A CN2008101412253 A CN 2008101412253A CN 200810141225 A CN200810141225 A CN 200810141225A CN 101348272 B CN101348272 B CN 101348272B
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- aluminum hydroxide
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Abstract
The invention provides a process for applying dry aluminum hydroxide fine materials, comprising the following steps: an aluminum hydroxide finished product is obtained from sodium aluminate seminal fluid through crystal seed decomposition, separation and washing; the aluminum hydroxide finished product is dried and then screened so as to form a coarse material part and a fine material part; the coarse material part is used as raw material to be sent into an aluminum fluoride production system; and the fine material part which is dried and screened is used as a crystal seed for a crystal seed decomposition procedure of the sodium aluminate seminal fluid. As the process directly uses the fine material part after screening the aluminum hydroxide for the crystal seed decomposition procedure of the sodium aluminate seminal fluid, the fine material part of which the price per ton is about 300 yuan lower than the aluminum hydroxide finished product can be directly transformed into the normal aluminum hydroxide finished product, thereby greatly reducing the cost of the aluminum hydroxide finished product and reducing the cost of ton products of the aluminum hydroxide and aluminum fluoride joint production by 12 to 40 yuan as well. The process realizes the reutilization of resources, accords with sustainable development strategy, and has higher economic benefit and social benefit.
Description
Technical field
The present invention relates to a kind of application process for drying aluminium hydroxide fines.
Background technology
In most Aluminums were produced, production of aluminum hydroxide system and aluminum fluoride by dry process production system were separated and are carried out.Henan Weilai Aluminum Industry (Group) Co., Ltd. has developed the technology of unique production of aluminum hydroxide system and aluminum fluoride by dry process production system combination producing, shown in Figure 2 in present process for combination producing schema such as the Figure of description, the production of aluminum hydroxide system is that sodium aluminate concentrate solution carries out decomposition of crystal seed through adding aluminium hydroxide crystal seed, and then after separating, washing, obtaining the aluminium hydroxide finished product, part aluminium hydroxide finished product sells; Another part aluminium hydroxide sieves after drying, and the coarse fodder after the screening is sent into the aluminum fluoride by dry process production system as raw material and prepared aluminum fluoride.Fines after the screening is sold as waste material, but the price of fines per ton is than low about 300 yuan of normal hydrogen price of aluminium oxide per ton, but the client is unwilling to accept this fines aluminium hydroxide, has difficulties when selling.The aluminium hydroxide that generally sieves can produce 4%～12% fines, and the low and difficult sale of the price of fines directly causes damage, wastes to enterprise, has also caused the situation of sales difficulty.
Summary of the invention
The purpose of this invention is to provide a kind of application process for drying aluminium hydroxide fines, fines partly is utilized effectively, reduced production cost.
For achieving the above object, the present invention is by the following technical solutions: a kind of application process for drying aluminium hydroxide fines, sodium aluminate concentrate solution gets the aluminium hydroxide finished product after decomposition of crystal seed, separation, washing, the aluminium hydroxide finished product sieves after drying again, screening forms coarse fodder part and fines part, the coarse fodder part is sent into aluminum fluoride production system as raw material, and the fines part after described drying, the screening is used for the decomposition of crystal seed operation of sodium aluminate concentrate solution as crystal seed.
The weight that described fines partly adds the decomposition of crystal seed operation is not more than 10% of crystal seed gross weight in the decomposition of crystal seed operation.
Fines after the present invention sieves aluminium hydroxide partly is directly used in the decomposition of crystal seed operation of sodium aluminate concentrate solution, the fines that can make price per ton be lower than about 300 yuan of aluminium hydroxide finished products partly is converted into normal aluminium hydroxide finished product, the cost that fines per ton partly is used for the decomposition of crystal seed operation and is increased is no more than 10 yuans, but make the lower fines of price partly be converted into the aluminium hydroxide finished product, thereby greatly reduce the cost of aluminium hydroxide finished product, also make the ton product cost of aluminium hydroxide-aluminum fluoride combination producing reduce by 12～40 yuan, fines partly recycles the pressure that has also alleviated sales department simultaneously, realized the utilization again of resource, meet the strategy of sustainable development, have high economic benefit and social benefit.
Description of drawings
Fig. 1 is a process flow sheet of the present invention;
Fig. 2 is the process flow sheet of prior art.
Embodiment
Embodiment 1: application process for drying aluminium hydroxide fines as shown in Figure 1, sodium aluminate concentrate solution gets the aluminium hydroxide finished product after decomposition of crystal seed, separation, washing, the aluminium hydroxide finished product sieves after drying again, screening forms coarse fodder part and fines part, the coarse fodder part is sent into aluminum fluoride production system as raw material, fines part is used for the decomposition of crystal seed operation of sodium aluminate concentrate solution as crystal seed, the weight that fines partly adds the decomposition of crystal seed operation be in the decomposition of crystal seed operation crystal seed gross weight 1%.
Embodiment 2: be with the difference of embodiment 1: the weight that fines partly adds the decomposition of crystal seed operation be in the decomposition of crystal seed operation crystal seed gross weight 3%.
Embodiment 3: be with the difference of embodiment 1: the weight that fines partly adds the decomposition of crystal seed operation be in the decomposition of crystal seed operation crystal seed gross weight 5%.
Embodiment 4: be with the difference of embodiment 1: the weight that fines partly adds the decomposition of crystal seed operation be in the decomposition of crystal seed operation crystal seed gross weight 7%.
Embodiment 5: be with the difference of embodiment 1: the weight that fines partly adds the decomposition of crystal seed operation be in the decomposition of crystal seed operation crystal seed gross weight 10%.
Fines partly is used for the checking that experimentizes of decomposition of crystal seed operation: verification msg is as shown in table 1:
Table 1
This experiment is 250 rev/mins of mixing speed, decomposes 64 ℃ of initial temperature, decomposes under the condition of 45 ℃ of whole temperature, in the same resolving time, add the decomposition result of fines part as the crystal seed gained with the ratio that accounts for total crystal seed amount 0%, 1%, 3%, 5%, 7%, 10%.
The result shows by table 1, adding the fines part of sieving after the aluminium hydroxide drying with the ratio of total crystal seed amount below 10% does not influence whole decomposition of crystal seed process as the part crystal seed, also not influence of quality to aluminium hydroxide has also proved this result in practice is produced.
Claims (2)
1. application process for drying aluminium hydroxide fines, sodium aluminate concentrate solution gets the aluminium hydroxide finished product after decomposition of crystal seed, separation, washing, the aluminium hydroxide finished product sieves after drying again, screening forms coarse fodder part and fines part, the coarse fodder part is sent into aluminum fluoride production system as raw material, it is characterized in that: the fines part after described drying, the screening is used for the decomposition of crystal seed operation of sodium aluminate concentrate solution as crystal seed.
2. application process for drying aluminium hydroxide fines as claimed in claim 1 is characterized in that: the weight that described fines partly adds the decomposition of crystal seed operation is not more than 10% of crystal seed gross weight in the decomposition of crystal seed operation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008101412253A CN101348272B (en) | 2008-08-29 | 2008-08-29 | Application process for drying aluminium hydroxide fines |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008101412253A CN101348272B (en) | 2008-08-29 | 2008-08-29 | Application process for drying aluminium hydroxide fines |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101348272A CN101348272A (en) | 2009-01-21 |
| CN101348272B true CN101348272B (en) | 2011-06-15 |
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ID=40267272
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2008101412253A Expired - Fee Related CN101348272B (en) | 2008-08-29 | 2008-08-29 | Application process for drying aluminium hydroxide fines |
Country Status (1)
| Country | Link |
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| CN (1) | CN101348272B (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2010135856A1 (en) * | 2009-02-24 | 2010-12-02 | 河南未来铝业（集团）有限公司 | Process for producing aluminum hydroxide or alumina by the bayer process |
| WO2010096971A1 (en) * | 2009-02-24 | 2010-09-02 | 河南未来铝业（集团）有限公司 | Method for catalytic decomposition of sodium aluminate solution |
| CN104671266B (en) * | 2013-11-28 | 2016-09-07 | 北京阳光欣禾科技有限公司 | A kind point-score prepares the process of ultrafine aluminium hydroxide |
| CN104817100B (en) * | 2015-04-15 | 2017-01-04 | 中南大学 | A kind of method preparing sandy alumina |
| CN111646492B (en) * | 2020-06-18 | 2021-09-21 | 清华大学 | Gamma-alumina nano fiber and preparation method thereof |
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2008
- 2008-08-29 CN CN2008101412253A patent/CN101348272B/en not_active Expired - Fee Related
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| Publication number | Publication date |
|---|---|
| CN101348272A (en) | 2009-01-21 |
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