A method for synergistically regulating and strengthening the decomposition of sodium aluminate solution seed crystals

A technology of sodium aluminate and crystal seeds, which is applied in the field of aluminum metallurgy, can solve the problems of insignificant economy, large equipment investment, and high operating costs, and achieve high decomposition rate, improved output rate and cycle efficiency, and less new equipment. Effect

Inactive Publication Date: 2019-11-08
CENT SOUTH UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this method can produce sandy alumina, the temperature is high, the equipment investment is large, the operating cost is high, and the economy is not significant.

Method used

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  • A method for synergistically regulating and strengthening the decomposition of sodium aluminate solution seed crystals
  • A method for synergistically regulating and strengthening the decomposition of sodium aluminate solution seed crystals

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] (1) Preparation of highly active seed crystal slurry: take 50mL sodium bicarbonate slurry (NaHCO 3 120g / L), added to a 500mL beaker, heated to 45°C in a water bath; added 70mL sodium aluminate solution (Na 2 O155.01g / L, Al 2 o 3 179.59g / L, α K 1.42), induce nucleation for 30 minutes; then add 20 mL of sodium aluminate solution, decompose quickly for 60 minutes, and prepare a slurry of highly active aluminum hydroxide seed crystals. The particle size of aluminum hydroxide is fine (average particle size d501.4μm, less surface-to-surface superimposition, mainly intersecting or perpendicular to each other, particle edges are jagged, poor crystallization), and the stirring time is 4 hours at 45°C.

[0029] (2) Solution seeding enhancement: Take 900mL of sodium aluminate solution and add it to a 2000mL stainless steel bucket, heat it in a water bath to a temperature of 60°C, and add aluminum hydroxide circulating seeds at 1000g / L (average particle size d5060.13μm, - The n...

Embodiment 2

[0032] (1) Preparation of highly active seed crystal slurry: take 50mL sodium bicarbonate slurry (NaHCO 3 120g / L), added to a 500mL beaker, heated in a water bath to 40°C; added 50mL of sodium aluminate solution (Na 2 O160.23g / L, Al 2 o 3 185.64g / L, α K 1.42), induce nucleation for 30 minutes; then add 50 mL of sodium aluminate solution, decompose quickly for 60 minutes, and prepare a slurry of highly active aluminum hydroxide seed crystals. The particle size of aluminum hydroxide is fine (average particle size d502.5μm, the particles are mainly vertical or intersecting), and the stirring time is 3.5 hours at 40°C.

[0033] (2) Solution seeding enhancement: Take 900mL of sodium aluminate solution and add it to a 2000mL stainless steel bucket, heat it in a water bath to a temperature of 60°C, and add aluminum hydroxide circulating seeds at 1000g / L (average particle size d5060.13μm, - The number of 45 μm particles accounted for 18.21% of the total), and 15 mL of highly activ...

Embodiment 3

[0036] Adopt technological process of the present invention ( figure 1 ):

[0037] (1) Preparation of highly active seed crystal slurry: take 50mL sodium bicarbonate slurry (NaHCO 3 100g / L), added to a 500mL beaker, heated to 40°C in a water bath; 50mL of sodium aluminate solution (Na 2 O162.10g / L, Al 2 o 3 189.31g / L, α K 1.41), induce nucleation for 10 minutes; then add 50mL of sodium aluminate solution, decompose quickly for 60 minutes, and prepare a slurry of highly active aluminum hydroxide seed crystals. Highly active aluminum hydroxide seed crystals have fine particle size (average particle size d501.4μm, vertical or intersecting surfaces, irregular and jagged edges, figure 2 ), 40°C residence stirring time is less than 2 hours.

[0038] (2) Solution seeding enhancement: Take 900mL of sodium aluminate solution and add it to a 2000mL stainless steel bucket, heat it in a water bath to a temperature of 60°C, and add the aluminum hydroxide seed crystals (average Part...

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Abstract

A method of cooperatively regulating and improving crystal seed decomposition of sodium aluminate solution includes the steps of preparing high-activity crystal seed slurry, reinforcing seed precipitation, pretreating and agglomerating fine particles. In the method, solution decomposition and crystallization processes are regulated through multiple means, thus solving a contradictory problem of increasing decomposition rate and guaranteeing production quality. By means of the method, solution decomposition rate can reach more than 57%. The product has a sandy appearance and can satisfy first grade in national standard. The method is high in decomposition rate, can form the sandy product, has simple process and low investment, and has extensive application prospect.

Description

technical field [0001] The invention relates to a method for synergistically regulating and strengthening the decomposition of sodium aluminate solution seed crystals, which belongs to the technical field of aluminum metallurgy. Background technique [0002] Sodium aluminate solution seed decomposition (commonly called "seed classification") is a key process in the production of alumina by the Bayer process, which directly affects the output rate, product quality and main technical and economic indicators. [0003] As a raw material for electrolytic aluminum, sandy alumina has the advantages of good fluidity, low flying loss, low dust content, and high specific surface area, and sandy aluminum hydroxide decomposed from sodium aluminate solution is the basis for the production of sandy alumina. At present, whether the traditional one-stage or the traditional two-stage seed separation method is adopted, when ensuring the production of sandy aluminum hydroxide, the seed separat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F7/14
CPCC01F7/14C01P2004/03C01P2004/61C01P2006/80
Inventor 李小斌刘桂华彭志宏周秋生齐天贵叶普洪刘井辉李铮
Owner CENT SOUTH UNIV
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