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Method for preparing pure calcium aluminate cement from electrically collected dust powder produced in roasting of aluminum hydroxide

A technology of pure calcium aluminate cement and aluminum hydroxide, which is applied in the field of preparing pure calcium aluminate cement by roasting electric dust collector powder with aluminum hydroxide, can solve the problem of high production cost, reduce the cost of milling, reduce the production cost, and improve the The effect of market competitiveness

Inactive Publication Date: 2020-01-31
中铝中州铝业有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Industrial high-purity calcium aluminate cement is generally made of industrial alumina as raw material, mixed with high-quality lime or light calcium carbonate, and is obtained by high-temperature downdraft kiln, rotary kiln sintering or electric arc furnace melting, and the production cost is relatively high.

Method used

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  • Method for preparing pure calcium aluminate cement from electrically collected dust powder produced in roasting of aluminum hydroxide
  • Method for preparing pure calcium aluminate cement from electrically collected dust powder produced in roasting of aluminum hydroxide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] The electric dust collector powder from the process of boiling and roasting aluminum hydroxide to produce alumina is screened and removed by a vibrating screen, and the material under the screen is homogenized; the calcium aluminate clinker CA-60 (ie, CaO· Al 2 o 3 ) of the two proportioning (dust collection powder: light calcium carbonate=54.13%: 45.87%) to calculate the required amount of dust collection powder and light calcium carbonate, and take the electric dust collection powder and light calcium carbonate of the required amount respectively Grind in a dry porcelain lining ball mill for 30 hours, ball: material = 2: 1, the average particle size of the dust collection powder after grinding is 4.9 μm, and the average particle size of light calcium carbonate is 4.8 μm, then grind the two Mix the raw materials evenly in the mixer; put the finely ground mixed raw materials into a stainless steel sugar coating machine, add 5‰ peach gum aqueous solution, and roll them ...

Embodiment 2

[0024] The electric dust collector powder from the process of boiling and roasting aluminum hydroxide to produce alumina is screened and removed by a vibrating screen, and the material under the screen is homogenized; the calcium aluminate clinker CA-80 (ie CaO· 2Al 2 o 3 ) of the two proportioning (dust collection powder: light calcium carbonate=70.24%: 29.76%) calculates the required amount of dust collection powder and light calcium carbonate, and takes the electric dust collection powder and light calcium carbonate of the required amount respectively Grind for 25 hours in a dry-type ceramic lining ball mill, ball: material = 2: 1, the average particle diameter of the dust collection powder after grinding is 5.2 μm, and the average particle diameter of light calcium carbonate is 5 μm, and then the two kinds of finely ground Mix the raw materials evenly in the mixer; put the finely ground mixed raw materials into a stainless steel sugar coating machine, add 5.5‰ peach gum a...

Embodiment 3

[0026] The electric dust collector powder from the process of boiling and roasting aluminum hydroxide to produce alumina is screened and removed by a vibrating screen, and the material under the screen is homogenized; the calcium aluminate clinker CA-70 (ie, CaO· Al 2 o 3 and CaO·2Al 2 o 3 summed average value) of the two proportioning (dust collection powder: light calcium carbonate=62.19%: 37.81%) to calculate the required amount of dust collection powder and light calcium carbonate, and take the required amount of electric dust collection powder and light calcium carbonate The high-quality calcium carbonate was ground in a dry-type porcelain-lined ball mill for 32 hours respectively, ball: material=2: 1, the average particle diameter of dust-collecting powder after grinding was 4.9 μ m, and the average particle diameter of light calcium carbonate was 4.8 μ m, and then Mix the two kinds of finely ground raw materials evenly in the mixer; put the finely ground mixed raw ma...

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Abstract

The invention discloses a method for preparing pure calcium aluminate cement from electrically collected dust powder produced in roasting of aluminum hydroxide. The method comprises the following steps: 1) screening the electrically collected dust powder produced in roasting of aluminum hydroxide to remove impurities, and homogenizing an undersize material; 2) respectively weighing the electrically collected dust powder and light calcium carbonate according to the proportion required by a calcium aluminate formula, carrying out grinding for 25-32 hours, and uniformly mixing the two ground materials; 3) putting the finely ground and uniformly mixed raw materials into a sugar coating machine, adding 0.5-0.55% o of an aqueous peach gum solution, and carrying out rolling into balls; 4) holdingthe balls in a sagger, and carrying out firing at a temperature of 1450-1700 DEG C for 2-8 hours; and 5) cooling, crushing and grinding a sintered material to obtain fine powder. By adopting the method disclosed by the invention, a pure calcium aluminate cement product meeting the national standard GB / T201-2015 of aluminate cement can be prepared. According to the method, the electrically collected dust powder produced in roasting of aluminum hydroxide is used in the production of high-grade refractory materials, so the production cost of the pure calcium aluminate cement can be reduced, andthe quality of metallurgical-grade aluminum oxide is improved.

Description

technical field [0001] The invention relates to the recycling technology of aluminum hydroxide roasting dust, in particular to a method for preparing pure calcium aluminate cement from aluminum hydroxide roasting electric dust collection powder. Background technique [0002] In the alumina production process, aluminum hydroxide boiling roasting is the last process of the whole process. The purpose of roasting is to remove the attached water and crystallization water of aluminum hydroxide, and complete the transformation of part of γ-AI2O3 to α-AI2O3 , to generate alumina whose physical and chemical properties meet the requirements of electrolysis. During the boiling and roasting process of aluminum hydroxide, aluminum hydroxide is preheated by hot air at a temperature of 380°C in the Venturi dryer and enters the preheating cyclone, and is classified under the action of centrifugal force. The coarse powder enters the main roasting system, and the fine powder enters the main r...

Claims

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Application Information

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IPC IPC(8): C04B7/32C04B7/36
CPCC04B7/32C04B7/36
Inventor 李太昌陈洪德王庆玲于海艳
Owner 中铝中州铝业有限公司