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Process for smelting aluminium by carbon reduction method via adding sodium chloride-alumina molten salt

An alumina and sodium chloride technology, which is applied in the field of sodium chloride-alumina molten salt carbon reduction method for aluminum smelting process, can solve the problems of low energy utilization rate, large equipment investment, low single-tank production capacity, etc., and achieve pollution The effect of small size, low investment and low labor intensity

Inactive Publication Date: 2007-04-25
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] 1. The energy utilization rate is low, and the electric energy efficiency is only 40-50%.
[0004] 2. Raw materials and material costs required for electrolysis
[0005] 3. Unit consumption of direct current per ton of aluminum is 13500-15000 1 kWh
[0006] 4. The production capacity of a single slot is low, and the investment in equipment is large

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0061] Tests using 100ml boron nitride crucible:

[0062] 1. Raw materials: all use industrial grade. The primary alumina is 98.6%, the calcined petroleum coke contains more than 98.95% carbon, and the particle size is 1mm. Sodium chloride chemical reagent 150g.

[0063] 2. Soak alumina in 10% hydrochloric acid solution for 4 hours;

[0064] 3. The soaked alumina is dried at 100°C;

[0065] 4. Mix the obtained alumina 25.0±0.1g and carbon 4.4±0.1g evenly;

[0066] 5. Put the mixture into the smelting furnace, the furnace temperature is 800°C, and the sodium chloride begins to melt;

[0067] 6. Add alumina to the sodium chloride molten salt, first add 0.5% alumina, and then add 1.0% alumina each time.

[0068] Adding method: add about 5g of alumina each time, and the time interval is about 10 minutes. The smelting time is 60 minutes.

[0069] The obtained aluminum is: 10.7±0.1g.

Embodiment 2

[0071] Tests using a 200ml boron nitride crucible:

[0072] 1. Raw materials: all use industrial grade. Alumina grade 98.6%, calcined petroleum coke contains more than 98.95% carbon, particle size 0? mm. Sodium chloride chemical reagent 300g.

[0073] 2. Soak alumina in 3% hydrochloric acid solution for 24 hours;

[0074] 3. The soaked alumina is dried at 500°C;

[0075] 4. Mix the obtained alumina 50.0±0.1g and carbon 8.8±0.1g evenly;

[0076] 5. Put the mixture into the smelting furnace, the furnace temperature is 820°C, and the sodium chloride begins to melt;

[0077] 6. Add alumina to the sodium chloride molten salt, first add 0.5% alumina, and then add 3.0% alumina each time.

[0078] Feeding method: add about 10g of alumina each time, the time interval is about 20 minutes, and the smelting time is 100 minutes.

[0079] The obtained aluminum is: 21.3±0.1g.

Embodiment 3

[0081] Tests using 100ml boron nitride crucible:

[0082] 1. Raw materials: all use industrial grade. The primary alumina is 98.6%, the calcined petroleum coke contains more than 98.95% carbon, and the particle size is 1mm. Sodium chloride chemical reagent 150g.

[0083] 2. Soak alumina in 0.5% hydrochloric acid solution for 4 hours;

[0084] 3. The soaked alumina is dried at 100°C;

[0085] 4. Mix the obtained alumina 25.0±0.1g and carbon 4.4±0.1g evenly;

[0086] 5. Put the mixture into the smelting furnace, the furnace temperature is 800°C, and the sodium chloride begins to melt;

[0087] 6. Add alumina to the sodium chloride molten salt, first add 0.5% alumina, and then add 1.0% alumina each time.

[0088] Adding method: add about 5g of alumina each time, and the time interval is about 10 minutes. The smelting time is 60 minutes.

[0089] The obtained aluminum is: 10.7±0.1g.

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Abstract

A method for aluminum annealing technology using natrium muriaticum-aluminium oxide fused salt carbon reduction method, contains the following methods and steps: crushing calcined oil coke metallurgical coke to 1-0mm or powder, adding aluminium oxide into hydrochloric acid solution with concentration of 0.5 ~ 20% for immersion of 4-24 hours; oven-drying the aluminium oxide at 100-500 DEG C, adding 174kg+-0.1g carbon into per ton aluminium oxide, mixing and putting into smelting furnace at a temperature of 800-820DEG C, sodium chloride staiting to melt,adding aluminium oxide into sodium chloride fused salt by fractionation, the first time adding 0.5-1.0% alumina, 1.0-3.0% for each subsequent adding. The invention uses sodium chloride as the solventand also as a catalyst, adopts carbon reduction method for luminium extracting, has the advantages of less investment and quick, large production capacity for a single furnace and reduces the cost of production.

Description

technical field [0001] The invention relates to an aluminum oxide molten salt aluminum smelting process, in particular to a sodium chloride-alumina molten salt carbon reduction aluminum smelting process using a sodium chloride reduction method for aluminum smelting. Background technique [0002] The ice crystal-alumina molten salt electrolysis method has been used for a long time to smelt aluminum. The existing problems are as follows: [0003] 1. The energy utilization rate is low, and the electric energy efficiency is only 40-50%. [0004] 2. Raw materials and material costs required for electrolysis. [0005] 3. The unit consumption of direct current per ton of aluminum is 13500-15000 1 kWh. [0006] 4. The production capacity of a single tank is low, and the investment in equipment is large. Contents of the invention [0007] The purpose of the present invention is to provide a kind of sodium chloride that uses sodium chloride as a solvent, is also a catalyst, and a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B21/02
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