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Method for innocent treatment of secondary aluminum ash by weakly alkaline water washing

A harmless treatment and weakly alkaline water technology, applied in chemical instruments and methods, inorganic chemistry, sustainable waste treatment, etc., can solve problems such as complex cost, complex cost of equipment, difficult separation, etc., to achieve convenient and stable recycling, The effect of solving overcapacity and meeting usage requirements

Pending Publication Date: 2022-06-28
UNIV OF JINAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The treatment device includes high temperature reaction furnace, cyclone separation tower, electrode dust collector, calcium carbonate absorption tower, bag filter, and collection box; the device is complicated and expensive, and the high temperature reaction furnace consumes a lot of energy and has high temperature requirements, so it is not suitable for concrete minerals Admixture field
[0005] Chinese patent (application number 201910938317.2) discloses an efficient and clean secondary aluminum ash harmless treatment method, but it requires a roasting process, the firing temperature is 860°C to 1200°C, high energy consumption, high temperature requirements, not Applicable to the field of concrete mineral admixtures
[0006] Chinese patent (application number 202111357964.8) discloses a secondary aluminum ash harmless treatment process, which also has the problem of complex equipment and high cost, and is not suitable for the field of concrete mineral admixtures
[0007] Chinese patent (application number 202111317619.1) discloses a method for treating aluminum ash by a low-temperature harmless wet method. The method is simple, low in energy consumption, and avoids the danger of explosion in the dry method; solution; sulfuric acid solution is a strong acid, which is dangerous, and the product aluminum sulfate is not suitable for the field of concrete mineral admixtures
[0009] The existing technology is to process secondary aluminum ash by electrothermal method, acid leaching method, and alkali fusion method. At present, they are still in the laboratory stage. Due to problems such as difficult separation, high cost, and easy generation of secondary hazardous waste, it is not applicable. Large-scale treatment of secondary aluminum ash

Method used

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  • Method for innocent treatment of secondary aluminum ash by weakly alkaline water washing
  • Method for innocent treatment of secondary aluminum ash by weakly alkaline water washing
  • Method for innocent treatment of secondary aluminum ash by weakly alkaline water washing

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] The secondary aluminum ash is selected from the aluminum ash of Henan Borun Casting Materials Co., Ltd., and the content of metal aluminum is 15%.

[0049] First heat 70kg of tap water to boiling and the temperature is 90°C, then add 25kg of secondary aluminum ash and 1kg of sodium carbonate into the water for stirring and mixing, the generated high-temperature ammonia vapor is collected through a condenser tube to collect the condensate, and the remaining gas is introduced into a water tank for filtration Then, the solution was kept stirring at a constant speed and kept at a constant temperature for 6 hours; the secondary aluminum ash was precipitated and filtered, and dried and ground. By XRF analysis, the nitrogen removal rate was 98.4%.

[0050] After the reaction, the recovery method of sodium carbonate is:

[0051] Evaporate and crystallize the recycled high-temperature alkaline water to obtain sodium carbonate powder with a small amount of impurities.

Embodiment 2

[0053] The secondary aluminum ash is selected from the aluminum ash of Henan Borun Casting Materials Co., Ltd., and the content of metal aluminum is 15%.

[0054] First, heat 80kg of tap water to boiling and the temperature is 85°C, then add 30kg of secondary aluminum ash and 1kg of sodium carbonate into the water for stirring and mixing, and the generated high-temperature ammonia vapor is collected through a condenser tube to collect the condensate, and the remaining gas is introduced into a water tank for filtration Then, the solution was kept stirring at a constant speed and kept at a constant temperature for 7 hours; the secondary aluminum ash was precipitated and filtered, and dried and ground. By XRF analysis, the nitrogen removal rate was 98%.

Embodiment 3

[0056] The secondary aluminum ash is selected from the aluminum ash of Henan Borun Casting Materials Co., Ltd., and the content of metal aluminum is 15%.

[0057] First heat 40kg of tap water to 80°C, then add 10kg of secondary aluminum ash and 0.5kg of potassium carbonate into the water for stirring and mixing, the generated high-temperature ammonia vapor is collected through the condenser tube to collect the condensate, and the remaining gas is introduced into the water tank for filtration and discharge; The solution was kept stirring at a constant speed and kept at a constant temperature for 8 hours; the secondary aluminum ash was precipitated and filtered, and dried and ground. By XRF analysis, the nitrogen removal rate was 98%.

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Abstract

The invention discloses a secondary aluminum ash alkalescent washing harmless treatment method, belongs to the technical field of aluminum ash treatment, and adopts a technical method for hydrolyzing aluminum nitride in a high-temperature water bath heating environment by doping an alkalescent catalyst. According to the method, the problems that in the harmless treatment process of the secondary aluminum ash, a traditional chemical treatment method is difficult to separate, high in manufacturing cost, prone to generating secondary hazardous waste, very difficult to apply to concrete mineral admixtures and the like are solved, aluminum nitride in the secondary aluminum ash can be remarkably removed, and the volatilization toxicity of the secondary aluminum ash is effectively reduced.

Description

technical field [0001] The invention relates to the technical field of aluminum ash treatment, in particular to a method for harmless treatment of secondary aluminum ash by weak alkaline water washing. Background technique [0002] Secondary aluminum ash is secondary ash produced in the process of aluminum electrolysis and aluminum smelting. The main components are aluminum, aluminum oxide, aluminum nitride, etc., and also contain a small amount of fluoride salts, chlorides and other toxic and harmful substances. Aluminum nitride is prone to hydrolysis when it comes into contact with water or is affected by a humid environment, releasing ammonia and nitrogen, which pollutes the atmosphere and poses a potential safety hazard. In 2020, the Ministry of Ecology and Environment of the People's Republic of China issued the "National Hazardous Waste List", which clearly pointed out that secondary aluminum ash is hazardous waste. [0003] Under the strict requirements of energy sa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B20/02C04B18/14C01C1/02
CPCC04B20/023C04B18/141C01C1/022Y02W30/91
Inventor 谢群周代昱杨涛春林明强
Owner UNIV OF JINAN
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