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Method for continuously producing aluminium electrolysis raw materials high-fluorine alumina, cryolite and sodium silicate with aluminum dust

A technology of high-fluorine alumina and aluminum electrolysis, applied in the direction of aluminum fluoride, aluminum oxide/hydroxide, aluminum halide, etc., can solve the problems of unrealized continuous production, low resource utilization rate, complicated process flow, etc., and achieve Environmentally friendly, simple operation, and short technological process

Active Publication Date: 2010-09-08
中南大学科技园(湖南)发展有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above methods are all single production, without realizing continuous production, the resource utilization rate is not high, the process flow is relatively complicated, the energy consumption is large, and there is environmental pollution of waste and wastewater

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] (1) Take 50 g of sieved aluminum ash, and leach for 130 min at 70° C. in 150 ml of water under stirring at 400 r / min;

[0016] (2) The solution after leaching is press-filtered, and the filter residue enters the subsequent process, and the filtrate is evaporated and concentrated to obtain mixed crystals of NaCl and KCl; the evaporated mother liquor is returned to the leaching process; the filter residue is roasted at 850° C. for 15 minutes;

[0017] (3) Add 15m oxidant H to the roasted product 2 o 2 0.5% (volume) HF solution, so that the total volume is 250ml; leaching 60min under stirring at 500r / min;

[0018] (4) solution after leaching is by pressure filtration, and the solid that filtrate obtains after evaporating and concentrating produces cryolite according to prior art; Evaporation mother liquor reacts with NaOH and produces water glass according to prior art; Filter residue is dried 12 hours at 90 ℃, MgF 2 46.52g of high-fluorine alumina, its main element com...

Embodiment 2

[0020] (1) Take 50g of sieved aluminum ash, and leaching for 70min at 50°C in 50ml water under stirring at 800r / min;

[0021] (2) The solution after leaching is press-filtered, and the filter residue enters the subsequent process, and the filtrate is evaporated and concentrated to obtain NaCl and KCl mixed crystals; the evaporated mother liquor is returned to the leaching process; the filter residue is roasted at 800 ° C for 50 minutes;

[0022] (3) Add 150ml of HF solution containing 5.5% (volume) to the roasted product, and simultaneously feed oxidant O at a rate of 15g / h. 3 , leaching for 90min under stirring at 1000r / min;

[0023] (4) solution after leaching is by pressure filtration, and the solid that filtrate obtains after evaporating and concentrating produces cryolite according to prior art; Evaporation mother liquor reacts with NaOH and produces water glass according to prior art; Filter residue is dried 12 hours at 90 ℃, MgF 2 42.56g of high-fluorine alumina, its ...

Embodiment 3

[0025] (1) Take 50 g of sieved aluminum ash, and leach for 150 min at 100° C. in 75 ml of water under stirring at 1000 r / min;

[0026] (2) The solution after leaching is press-filtered, and the filter residue enters the subsequent process, and the filtrate is evaporated and concentrated to obtain mixed crystals of NaCl and KCl; the evaporated mother liquor is returned to the leaching process; the filter residue is roasted at 750° C. for 90 minutes;

[0027] (3) Add 10ml saturated NaNO to the roasted product 2 2.5% (volume) HF solution of the solution, so that the total volume of the solution is 50ml, leaching for 120min under stirring at 100r / min;

[0028] (4) The solution after leaching is filtered by pressure, and the solid obtained after the filtrate is evaporated and concentrated is used to synthesize cryolite; the evaporated mother liquor is reacted with NaOH to produce water glass; the filter residue is dried at 90°C for 12 hours to obtain 2 40.58g of high-fluorine alum...

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Abstract

The invention discloses a method for continuously producing aluminium electrolysis raw materials high-fluorine alumina, cryolite and sodium silicate with aluminum dust, which comprises the following steps that: aluminum gray is added with water, soaked and filtered, the filtrate is evaporated and concentrated to obtain a NaCl and KCL mixed crystal; filter residue is calcined for 15 to 60min at 750 to 950DEG C; 0.5 to 10 percent HF solution which contains 10 to 40ml of oxidant is added into a calcined product by the solid-liquid ratio of 1:1 to 1:10 to be soaked and react for 30 to 180min under the stirring at 100 to 1000r / min; the solution is filtered, the solid after the evaporation and the concentration of the filtrate is dried to prepare cryolite according to the prior art; the cryolite evaporation mother liquor reacts with NaOH to prepare the sodium silicate according to the prior art; and the filter residue is dried for 12h at 90 to 110 DEG C, and the high-fluorine alumina which contains MgF2 is obtained. The method can continuously produce high- fluorine alumina, cryolite and sodium silicate with high activity for an electrolyzer, is environmental-friendly during the production process, has energy consumption far lower than that of a traditional process and short process, and is simple to operate.

Description

technical field [0001] The invention relates to a method for continuously producing high-fluorine alumina, cryolite and water glass as raw materials for aluminum electrolysis by using aluminum ash. Background technique [0002] Chinese patent CN101177292 discloses a method of using aluminum ash to produce fluorine-containing β-alumina for aluminum electrolytic cells. The original aluminum waste ash is added to water 1 to 3 times the weight of aluminum ash, stirred evenly, soaked, filtered and dehydrated until the water content is less than 8%; Evaporate the solution obtained by filtration and dehydration to obtain mixed crystals of NaCl, KCl, and NaF; add the dehydrated primary aluminum waste ash to a dilute hydrochloric acid solution that is 2 to 3 times the weight of the primary aluminum waste ash and mix fully, and the pH of the mixed solution 5~6, heat the mixed slurry and stir at 80~100°C for 3~5 hours to generate NH 3 and Al(OH) 3 , the hydrolyzed Al(OH) 3 Calcining...

Claims

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Application Information

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IPC IPC(8): C01F7/02C01F7/54C01B33/32
Inventor 冀树军李菲郭学益田庆华苏鹏
Owner 中南大学科技园(湖南)发展有限公司
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