CN102502731A - Method for manufacturing superfine aluminum hydroxide micropowder - Google Patents
Method for manufacturing superfine aluminum hydroxide micropowder Download PDFInfo
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- CN102502731A CN102502731A CN2011103087554A CN201110308755A CN102502731A CN 102502731 A CN102502731 A CN 102502731A CN 2011103087554 A CN2011103087554 A CN 2011103087554A CN 201110308755 A CN201110308755 A CN 201110308755A CN 102502731 A CN102502731 A CN 102502731A
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- aluminum hydroxide
- superfine aluminum
- aluminium hydroxide
- decomposition
- micro mist
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Abstract
The invention provides a method for manufacturing superfine aluminum hydroxide micropowder and relates to a method for manufacturing superfine aluminum hydroxide by using Bayer lotion. The method is characterized by utilizing Bayer red mud lotion to manufacture the superfine aluminum hydroxide micropowder by seed crystal decomposition. The domestic production of the superfine aluminum hydroxide micropowder in prior arts adopts sintering process refined liquid; however, only few factories at home manufacture aluminum hydroxide by a sintering process and the capacity is less than 5% of that of aluminum oxide at home and the production cost is high, so that the method for manufacturing the superfine aluminum hydroxide micropowder by using the Bayer lotion has the advantages of wide source of raw materials and low cost. The method for manufacturing the superfine aluminum hydroxide micropowder of the invention is characterized by utilizing the Bayer red mud lotion to manufacture the superfine aluminum hydroxide micropowder by the seed crystal decomposition; after the decomposition, slurry is filtered, washed and dried to obtain a superfine aluminum hydroxide product with the diameter of D50=0.8-2 microns, whiteness more than 95 and oil absorption value of 35-39ml/100g. According to the method provided by the invention, the difficulties that the supply amount of the sintering process refined liquid is small and the cost is high are overcome, and a high-quality production way capable of meeting the supply need of the superfine aluminum hydroxide micropowder is provided.
Description
Technical field
A kind of method of producing fine aluminum hydroxide powder relates to a kind of method that adopts the Bayer process washing lotion to produce ultrafine aluminium hydroxide.
Technical background
At present, the ultrafine aluminium hydroxide micro mist normally adopts the seminal fluid preparation of alumina by sintering production process.Its main physical and chemical index is: granularity D50=1 ~ 3 μ m; Oil-absorption(number), 50 ~ 55ml/100g, Na2O %≤0.3; Because crude fuel price increase in the past few years; It is too high that sintering process is produced the aluminum oxide cost, and many sintering process production capacities stop production, limited production, had a strong impact on the production and the product-feed of ultrafine aluminium hydroxide micro mist.
Summary of the invention
The object of the invention is exactly the deficiency that exists to above-mentioned prior art, and a kind of method of the production ultrafine aluminium hydroxide micro mist that can effectively reduce production costs, satisfy the demands is provided.
The objective of the invention is to realize through following technical scheme.
A kind of method of producing the ultrafine aluminium hydroxide micro mist is characterized in that be adopting the Bayer process red mud washing lotion to produce the ultrafine aluminium hydroxide micro mist through decomposition of crystal seed.
A kind of method of producing the ultrafine aluminium hydroxide micro mist of the present invention is characterized in that the caustic sodium concentration 40 ~ 100g/l of described Bayer process washing lotion, caustic ratio 1.5 ~ 1.8.
A kind of method of producing the ultrafine aluminium hydroxide micro mist of the present invention, the decomposition temperature that it is characterized in that described decomposition of crystal seed is 50 ~ 70 ℃, resolving time 5 ~ 6h.
A kind of method of producing the ultrafine aluminium hydroxide micro mist of the present invention, the crystal seed that it is characterized in that described decomposition of crystal seed are that white lake grinds the thin crystal seed that obtains fineness D50=0.8 ~ 0.9 μ m, and the seed ratio of interpolation is 0.1 ~ 0.2.
A kind of method of producing the ultrafine aluminium hydroxide micro mist of the present invention, the crystal seed that it is characterized in that described decomposition of crystal seed are the superfine aluminum hydroxide seed of the D50=0.1 ~ 0.2 μ m of Tai-Ace S 150 and sodium aluminate solution reaction generation, and the seed ratio of interpolation is 0.005 ~ 0.015.
The method of a kind of economic production ultrafine aluminium hydroxide micro mist of the present invention; Adopt the Bayer process red mud washing lotion to produce the ultrafine aluminium hydroxide micro mist through decomposition of crystal seed; Decomposing rear slurry obtains D50=0.8 ~ 2 μ m through filtering, wash, drying; Whiteness>95, oil-absorption(number) 35 ~ 39ml/100g, the ultrafine aluminium hydroxide product of Na2O %≤0.2.Method of the present invention, biggest advantage are that raw material extensively is easy to get, and have effectively overcome the limitation of producing with your sintering process seminal fluid, have reduced production cost, and product index oil-absorption(number), Na2O content have bigger improvement simultaneously, for derived product provides high quality raw material.
Description of drawings
Fig. 1 is a process flow diagram of the present invention.
Embodiment
A kind of method of producing the ultrafine aluminium hydroxide micro mist is 40 ~ 100g/l at caustic sodium concentration, adds crystal seed in the Bayer process washing lotion of caustic ratio 1.5 ~ 1.8 and decomposes; 50 ~ 70 ℃ of decomposition temperatures, resolving time 5 ~ 6h, decomposing rear slurry obtains D50=0.8 ~ 2 μ m through filtering, wash, drying; Whiteness>95; Oil-absorption(number) 35 ~ 39ml/100g, the ultrafine aluminium hydroxide product of Na2O %≤0., 2.
The crystal seed preparation can be passed through two kinds of methods, and the one, white lake grinds the thin crystal seed that obtains fineness D50=0.8 ~ 0.9 μ m, and the seed ratio of interpolation is 0.1 ~ 0.2; The one, Tai-Ace S 150 and sodium aluminate solution reaction generate the superfine aluminum hydroxide seed of D50=0.1 ~ 0.2 μ m, and the seed ratio of interpolation is 0.005 ~ 0.015.
Embodiment 1
Na
2O
kThe Bayer process primary wash liquor of concentration 45g/l, α k1.7 adds Tai-Ace S 150 and makes thin aluminium hydroxide crystal seed; The seed slurry for preparing directly connect to join again carry out seed in the primary wash liquor and decompose; Seed is than 0.01,50 ~ 60 ℃ of decomposition temperatures, resolving time 6h; Slip after the decomposition makes D50=1 μ m, whiteness through filtration separating, washing, oven dry; 95, oil-absorption(number) 36ml/100g, the ultrafine aluminium hydroxide product of Na2O %≤0., 2.
Embodiment 2
Na
2O
kThe Bayer process primary wash liquor of concentration 90g/l, α k 1.55 adds white lake and grinds the thin crystal seed of fineness D50=0.8 μ m that obtains, and seed is than 0.12; 50 ~ 60 ℃ of decomposition temperatures; Resolving time 5h, the slip after the decomposition makes D50=1.5 μ m, whiteness through filtration separating, washing, oven dry; 95, oil-absorption(number) 37ml/100g, the ultrafine aluminium hydroxide product of Na2O %≤0., 2.
Claims (5)
1. method of producing the ultrafine aluminium hydroxide micro mist is characterized in that being adopting the Bayer process red mud washing lotion to produce the ultrafine aluminium hydroxide micro mist through decomposition of crystal seed.
2. a kind of method of producing the ultrafine aluminium hydroxide micro mist according to claim 1 is characterized in that the caustic sodium concentration 40 ~ 100g/l of described Bayer process washing lotion, caustic ratio 1.5 ~ 1.8.
3. a kind of method of producing the ultrafine aluminium hydroxide micro mist according to claim 1, the decomposition temperature that it is characterized in that described decomposition of crystal seed is 50 ~ 70 ℃, resolving time 5 ~ 6h.
4. a kind of method of producing the ultrafine aluminium hydroxide micro mist according to claim 1, the crystal seed that it is characterized in that described decomposition of crystal seed are that white lake grinds the thin crystal seed that obtains fineness D50=0.8 ~ 0.9 μ m, and the seed ratio of interpolation is 0.1 ~ 0.2.
5. a kind of method of producing the ultrafine aluminium hydroxide micro mist according to claim 1; The crystal seed that it is characterized in that described decomposition of crystal seed is the superfine aluminum hydroxide seed of the D50=0.1 ~ 0.2 μ m of Tai-Ace S 150 and sodium aluminate solution reaction generation, and the seed ratio of interpolation is 0.005 ~ 0.015.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011103087554A CN102502731A (en) | 2011-10-13 | 2011-10-13 | Method for manufacturing superfine aluminum hydroxide micropowder |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011103087554A CN102502731A (en) | 2011-10-13 | 2011-10-13 | Method for manufacturing superfine aluminum hydroxide micropowder |
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| CN102502731A true CN102502731A (en) | 2012-06-20 |
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| CN2011103087554A Pending CN102502731A (en) | 2011-10-13 | 2011-10-13 | Method for manufacturing superfine aluminum hydroxide micropowder |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104045100A (en) * | 2014-06-27 | 2014-09-17 | 中国铝业股份有限公司 | Preparation method of aluminum hydroxide |
| CN104045102A (en) * | 2014-06-27 | 2014-09-17 | 中国铝业股份有限公司 | Production method for aluminum hydroxide |
| CN109626406A (en) * | 2018-12-10 | 2019-04-16 | 贵州博汇联润铝业有限公司 | A kind of ultra-fine ultrawhite aluminum hydroxide micro mist preparation method |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1597527A (en) * | 2004-06-18 | 2005-03-23 | 中国铝业股份有限公司 | Preparation method low electric conductiving super fine aluminium hydroxide micro powder |
| CN101607725A (en) * | 2008-06-19 | 2009-12-23 | 中国科学院过程工程研究所 | A kind of method that reclaims aluminum oxide and sodium oxide in the Bayer process red mud |
-
2011
- 2011-10-13 CN CN2011103087554A patent/CN102502731A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1597527A (en) * | 2004-06-18 | 2005-03-23 | 中国铝业股份有限公司 | Preparation method low electric conductiving super fine aluminium hydroxide micro powder |
| CN101607725A (en) * | 2008-06-19 | 2009-12-23 | 中国科学院过程工程研究所 | A kind of method that reclaims aluminum oxide and sodium oxide in the Bayer process red mud |
Non-Patent Citations (6)
| Title |
|---|
| 《中国粉体技术》 20110831 杜善国等 碳化法制备超细氢氧化铝微粉晶种的研究 第17卷, 第4期 * |
| 《轻金属》 20000331 陈肖虎等 超微细高纯氧化铝制备 , 第3期 * |
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| 杜善国等: "碳化法制备超细氢氧化铝微粉晶种的研究", 《中国粉体技术》 * |
| 王建立等: "种分法制备超细氢氧化铝过程中的粒度控制", 《轻金属》 * |
| 陈肖虎等: "超微细高纯氧化铝制备", 《轻金属》 * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104045100A (en) * | 2014-06-27 | 2014-09-17 | 中国铝业股份有限公司 | Preparation method of aluminum hydroxide |
| CN104045102A (en) * | 2014-06-27 | 2014-09-17 | 中国铝业股份有限公司 | Production method for aluminum hydroxide |
| CN109626406A (en) * | 2018-12-10 | 2019-04-16 | 贵州博汇联润铝业有限公司 | A kind of ultra-fine ultrawhite aluminum hydroxide micro mist preparation method |
| CN109626406B (en) * | 2018-12-10 | 2021-03-16 | 贵州博汇联润铝业有限公司 | Preparation method of superfine ultra-white aluminum hydroxide micro powder |
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Application publication date: 20120620 |