Resourceful treatment method for aluminum ash

A treatment method and resource recovery technology, applied in the field of aluminum ash resource recovery, can solve problems such as difficulty in removing sodium and alkali, long process flow, high investment costs, etc., and achieve benefits for environmental protection, broad market prospects, and improved utilization. Effect

Active Publication Date: 2017-05-24
三门峡华森新型材料有限公司 +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the patent only mentions the use of evaporation to extract chlorides, and fails to further consider the treatment method of waste gas
[0014] Chinese invention patent 201110173851.2 adopts the Bayer method to produce alumina to process aluminum ash, the process is long, the investment is large, and there is a problem of difficulty in removing sodium and alkali in the stucco. The treated stucco is difficult to use for the production of refractory bricks or castables.
[0015] Chinese invention patent 201510808471.x uses alkali to catalyze deamination, and then dissolves after roasting at 300~900°C, the recovery rate of alumina is low, and the investment cost of building a separate factory is relatively large, and the economic benefit is low in cooperation with an alumina factory

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  • Resourceful treatment method for aluminum ash

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Effect test

Embodiment 1

[0047] A kind of aluminum ash recycling treatment method, used aluminum ash is Al 2 o 3 Aluminum ash with a content of 80% and a particle size of 60% under a 160-mesh sieve are sequentially subjected to denitrification, fluorine, arsenic treatment, metal impurity removal treatment, and finished product drying, such as figure 1 as shown,

[0048] a. the denitrification, fluorine, arsenic treatment comprises the following steps:

[0049] (a1) Hydrolytic denitrification: add water to aluminum ash and mix to form a slurry, the liquid-solid ratio is 3:1, the temperature is 40°C, and the stirring time is 0.5 hours. The aluminum nitride in the aluminum ash contacts with the water phase to form ammonia Gas, the reaction formula is as follows:

[0050] AlN+3H 2 O → Al(OH) 3 +NH 3 ↑

[0051] The generated ammonia gas escapes and enters the ammonia gas absorption tower, and the ammonia gas that enters is sprayed with circulating water in the ammonia gas absorption tower;

[00...

Embodiment 2

[0065] A kind of aluminum ash recycling treatment method, used aluminum ash is Al 2 o 3 Aluminum ash with a content of 85% and a particle size of 60% under a 160-mesh sieve are sequentially subjected to denitrification, fluorine, arsenic treatment, metal impurity removal treatment, and finished product drying, such as figure 1 as shown,

[0066] a. the denitrification, fluorine, arsenic treatment comprises the following steps:

[0067] (a1) Hydrolytic denitrification: add water to aluminum ash and mix to form a slurry, the liquid-solid ratio is 4:1, the temperature is 50°C, and the stirring time is 0.8 hours. The aluminum nitride in the aluminum ash contacts with the water phase to form ammonia Gas, the reaction formula is as follows:

[0068] AlN+3H 2 O → Al(OH) 3 +NH 3 ↑

[0069] The generated ammonia gas escapes and enters the ammonia gas absorption tower, and the ammonia gas that enters is sprayed with circulating water in the ammonia gas absorption tower;

[00...

Embodiment 3

[0083] A kind of aluminum ash recycling treatment method, used aluminum ash is Al 2 o 3 Aluminum ash with a content of 88% and a particle size of 60% under a 160-mesh sieve are sequentially subjected to denitrification, fluorine, arsenic treatment, metal impurity removal treatment, and finished product drying, such as figure 1 as shown,

[0084] a. the denitrification, fluorine, arsenic treatment comprises the following steps:

[0085](a1) Hydrolytic denitrification: add water to aluminum ash and mix to form a slurry, the liquid-solid ratio is 5:1, the temperature is 60°C, and the time is 1.0 hour while stirring continuously, the aluminum nitride in the aluminum ash contacts with the water phase to form ammonia Gas, the reaction formula is as follows:

[0086] AlN+3H 2 O → Al(OH) 3 +NH 3 ↑

[0087] The generated ammonia gas escapes and enters the ammonia gas absorption tower, and the ammonia gas that enters is sprayed with circulating water in the ammonia gas absorpt...

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Abstract

The invention provides a resourceful treatment method for aluminum ash. Firstly, denitrification treatment, defluorination treatment and arsenic removal treatment are conducted so that nitrogen in the aluminum ash can be separated out in the form of ammonia gas to be recycled, harmful substances such as fluorine and arsenic are volatilized out, roasting is conducted, and aluminum ash clinker is obtained; and then metal impurity removing treatment is conducted, the roasted aluminum ash clinker is broken and finely ground and then is leached through diluted acid, metal impurities such as K2O, Na2O, CaO and MgO in the aluminum ash clinker are dissolved out, iron is removed through magnetic separation, and after pressure filtration separation, a finished aluminum oxide product is obtained through drying. According to the resourceful treatment method for the aluminum ash, aluminum oxide, metallic aluminum and the like in the aluminum ash can be recycled, byproducts such as ammonia water and iron are obtained, waste is turned into wealth, the social resource utilization rate is increased, meanwhile, components of fluorine and arsenic in the aluminum ash are removed, innocent treatment is done, and environment protection is facilitated.

Description

technical field [0001] The invention belongs to the technical field of aluminum ash treatment, and in particular relates to a recycling treatment method for aluminum ash. Background technique [0002] Aluminum ash (or aluminum ash slag) is a kind of slag produced in the process of primary aluminum production, aluminum alloy production, waste aluminum recycling and aluminum ash treatment. Aluminum ash is produced in all processes of melting aluminum, mainly including metal aluminum, oxidation Mixture of aluminum and salt flux. Generally, according to the different aluminum content, aluminum ash can be divided into primary aluminum ash, secondary aluminum ash and tertiary aluminum ash, among which: [0003] (1) Primary aluminum ash: primary aluminum ash is produced in three ways, [0004] ①In the process of producing aluminum through molten salt electrolysis of alumina, due to the aluminum ash produced by the carrying of operating and testing equipment, anode replacement, al...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09B3/00B09B5/00C01F7/02
CPCC01F7/02B09B3/00B09B5/00B09B2101/02
Inventor 齐庆华邓卫明郑诗礼
Owner 三门峡华森新型材料有限公司
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