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Method for preparing coarse-particle aluminum hydroxide from aluminum ammonium sulfate solution

A technology of aluminum ammonium sulfate and aluminum hydroxide, which is applied in the preparation of aluminum hydroxide and other directions, can solve the problem of difficulty in producing coarse-grained aluminum hydroxide and the like

Active Publication Date: 2020-08-07
SHENYANG POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the intermediate material aluminum ammonium sulfate solution is acidic, and it is difficult to produce coarse-grained aluminum hydroxide that meets the requirements of metallurgical-grade alumina with existing equipment.

Method used

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  • Method for preparing coarse-particle aluminum hydroxide from aluminum ammonium sulfate solution
  • Method for preparing coarse-particle aluminum hydroxide from aluminum ammonium sulfate solution
  • Method for preparing coarse-particle aluminum hydroxide from aluminum ammonium sulfate solution

Examples

Experimental program
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Effect test

Embodiment 1

[0035] A method for preparing coarse-grained aluminum hydroxide from an ammonium aluminum sulfate solution. The preparation materials include ammonium aluminum sulfate solution, ammonia water, and a crystal growth accelerator; The feed port 5 of the horizontal reaction tank is pumped into the horizontal reaction tank. The crystal growth accelerator is sodium dodecylsulfonate, and the addition amount of the crystal growth accelerator is 400 ppm. The effect of the crystal growth accelerator is Promote the growth of aluminum hydroxide particles. Inside the tank body 1 of the horizontal reaction tank, from the feed port 5 to the discharge port 6, there are alternately provided with upper reinforcement baffles 10 that completely cover the upper half of the inner cavity and less than half of the inner cavity. The lower reinforced deflector 13 completely covered by the lower part, the deflector 10 and the tank body 1 are welded and fixed, the surface of the upper reinforced deflector...

Embodiment 2

[0038]A method for preparing coarse-grained aluminum hydroxide from an ammonium aluminum sulfate solution. The preparation materials include ammonium aluminum sulfate solution, ammonia water, and a crystal growth accelerator; The feed port 5 of the horizontal reaction tank is pumped into the horizontal reaction tank, the crystal growth accelerator is sodium dodecylbenzenesulfonate, and the addition of the crystal growth accelerator is 600 ppm, and the crystal growth accelerator It can promote the growth of aluminum hydroxide particles. Inside the tank body 1 of the horizontal reaction tank, from the feed port 5 to the discharge port 6, there are alternately provided with upper reinforcement baffles 10 that completely cover the upper half of the inner cavity and less than half of the inner cavity. The lower reinforced deflector 13 completely covered by the lower part, the deflector 10 and the tank body 1 are welded and fixed, the surface of the upper reinforced deflector 10, th...

Embodiment 3

[0040] A method for preparing coarse-grained aluminum hydroxide from an ammonium aluminum sulfate solution. The preparation materials include ammonium aluminum sulfate solution, ammonia water, and a crystal growth accelerator; The feed inlet 5 of the horizontal reaction tank is pumped into the horizontal reaction tank, and the crystal growth accelerator is a kind of sodium dodecylsulfonate and sodium dodecylbenzenesulfonate or a mixture thereof, and the crystal growth accelerator The addition amount of agent is 500 ppm, and the effect of crystal growth accelerator promotes the growth of aluminum hydroxide particle. Inside the tank body 1 of the horizontal reaction tank, from the feed port 5 to the discharge port 6, there are alternately provided with upper reinforced baffles 10 that completely cover the upper half of the inner cavity and fully cover the lower part that is less than half of the inner cavity. The lower reinforced deflector 13 for shielding, the deflector 10 and ...

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Abstract

The invention relates to a method for preparing coarse-particle aluminum hydroxide from an aluminum ammonium sulfate solution. An aluminum ammonium sulfate solution, ammonia water and a crystal growthpromoter are mixed through a solution pump, and the mixture is pumped into a horizontal reaction tank from a feed port of the horizontal reaction tank; upper reinforced flow guide plates and lower reinforced flow guide plates are alternately arranged in the tank body of the horizontal reaction tank from the feeding hole to the discharging hole; acid-resistant layers cover the surfaces of the upper reinforced flow guide plates, the surfaces of the lower reinforced flow guide plates and the inner wall of the tank body; a heating sleeve is arranged at the periphery of the tank body, a mixed solution enters from the feed port to the discharge port and is discharged for reaction for 4-10 hours, effluent slurry is subjected to solid-liquid separation to obtain a solid and a liquid, and the solid is washed and dried to obtain coarse-particle aluminum hydroxide. Due to the fact that the influence of mechanical stirring is avoided, outlets from which gaseous matter escapes and the probabilitythat aluminum hydroxide particles are mechanically broken is reduced, and conditions are provided for continuous growth of aluminum hydroxide.

Description

technical field [0001] The invention belongs to the field of alumina material production, in particular to a method for preparing coarse-grained aluminum hydroxide in an acidic system. Background technique [0002] my country is a big producer of alumina, its output has ranked first in the world for many years, and its total production exceeds 50% of the world's total. Alumina is mainly obtained from bauxite processed by the Bayer method or sintering method, but my country's bauxite resources are scarce, and the existing reserves cannot meet the needs of the development of the alumina industry. Exploring other non-bauxite aluminum-containing resources to produce alumina has become an urgent problem to be solved for the sustainable development of my country's alumina industry. [0003] For many years, high-alumina fly ash has been considered a "misplaced resource" due to its high aluminum content, and has become a research hotspot for scientific researchers. So far, the met...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/34
CPCC01F7/34C01P2004/61C01P2004/03
Inventor 吴玉胜刘金亮李来时
Owner SHENYANG POLYTECHNIC UNIV
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