The status quo and industry prospects of aluminum ash treatm
Date:2021-09-23 16:22:42
Author:admin
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216
Aluminium ash is a mixture composed of metallic aluminum, alumina, aluminum nitride, salt and other components, and contains abundant resources. After aluminum ash is defined as hazardous waste, traditional extensive treatment methods are no longer feasible. With the implementation of environmental protection taxes, enterprises urgently need economic, safe, and environmentally friendly aluminum ash treatment technology.
1. Traditional aluminum ash treatment method
(1) Recycling metal aluminum
Aluminum ash, especially primary aluminum ash contains high metal aluminum. Many technologies have been developed at home and abroad to recover the metal aluminum in aluminum ash. Mainly divided into two types: heat treatment method and cold treatment method. Common aluminum ash heat recovery technology including: frying ash recovery method, tilting rotary kiln treatment method, squeezing recovery method and centrifugal method, etc.
(2) Recycle alumina
The main methods for recovering alumina from aluminum ash include acid method, alkali smelting method, alkali leaching method, etc.
(3) Recycling salt
The salt in aluminum ash mainly comes from the flux added in the process of recovering aluminum by heat treatment.
(4) Recycle gas
Aluminum ash can produce hydrogen, ammonia, methane, hydrogen sulfide and other gases.
The advantages of traditional treatment methods are low investment costs, simple treatment processes, relatively extensive treatment processes, and low added value. Most companies are driven by their social responsibilities to prevent environmental pollution. Following the national environmental protection policy Tighten up, in the face of the huge stock of aluminum ash in my country and the status quo of stable increments, it is completely possible to carry out a resource-based processing method, concentrate more resources, and develop multiple, multi-driven collaborative processing methods to achieve the processing process The added value of the industry will attract more investment into the aluminum ash and solid waste treatment industry.
2. Resource utilization method of aluminum ash
(1) Used as a refining agent for steelmaking
Some manufacturers have developed a set of processes for preparing calcium aluminate from aluminum ash. First, the aluminum ash is crushed and ground, and the soluble and insoluble materials in the aluminum ash are separated by water leaching, and the salt is recovered from the solubles. The insoluble matter is mainly composed of aluminum oxide and a small amount of magnesium and silicon oxide, and basically does not contain aluminum nitride and metallic aluminum. Add a certain amount of calcium oxide to the insoluble matter, and burn it to calcium aluminate at 1 093~1 193 ℃, which can be used to remove the harmful element sulfur in high-quality steel. As a big country in iron and steel, the use of aluminum ash to prepare steelmaking flux is expected to realize the large-scale application of aluminum ash.
(2) Preparation of refractory materials
Refractory materials are widely used in high-temperature industries such as metallurgy, cement, ceramics, glass, petrochemicals, etc. Aluminum ash contains a large amount of alumina, making it a potential raw material for refractory production.
(3) Other uses
Using secondary aluminum ash, coal gangue, and petroleum coke as raw materials, high-content aluminum-silicon alloys can be prepared through high-temperature calcination and other processes. This technology not only reduces the production cost of aluminum-silicon alloys, but also realizes the comprehensive utilization of various wastes. It's multiple actions.
Above, a simple example of some traditional aluminum ash treatment methods and resource treatment methods; specific to a specific case, it must be based on the specific composition of aluminum ash, local policies, local industry status, etc., through a single treatment method of aluminum ash or multiple solidification methods. The waste co-processing method minimizes the cost and maximizes the value of aluminum ash treatment.
Henan Zhengzhou Mining Machinery Co., Ltd., a professional aluminum ash processing manufacturer, welcome to call us.
