Refining process method for producing anhydrous aluminum chloride through high aluminum fly ash

A technology of anhydrous aluminum chloride and high-aluminum fly ash, which is applied in the direction of aluminum chloride and aluminum halide, can solve the problems of low purity of anhydrous aluminum chloride and complicated process, and facilitate large-scale industrial production , High product purity, cheap raw materials

Inactive Publication Date: 2015-07-15
GUIYANG AL-MG DESIGN & RES INST
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Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a refining process for producing anhydrous aluminum chloride from high-alumina fly ash, so as to overcome the low purity of anhydrous aluminum chloride and the relatively complicated process in the prior art. insufficient

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  • Refining process method for producing anhydrous aluminum chloride through high aluminum fly ash

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Embodiment Construction

[0020] The process method of the present invention uses aluminum-containing fly ash as a raw material, is equipped with a certain amount of carbon value reducing agent and chlorine, and undergoes a chlorination reaction in a chlorination furnace. The main gases discharged from the chlorination furnace after the chlorination reaction are: MgCl 2 , CaCl 2 , NaCl, KCl, TiCl 4 , SiCl 4 , FeCl 3 , FeCl 2 , AlCl 3 , CO, CO 2 , N 2 , COCl 2 , Cl 2 The unreacted slag mainly includes: SiO 2 , CaO and MgO etc.

[0021] The mixed gas from the chlorination furnace is cooled by a two-stage dust collector, and the temperature is reduced to 320~400℃, so that MgCl 2 , CaCl 2 , NaCl, KCl, FeCl 2 Most of the impurities are removed in solid form; after two-stage cooling, the gas enters the first-stage separation tower for distillation, and further removes a small amount of MgCl2, CaCl2, NaCl, KCl, FeCl 2 And a lot of FeCl 3 For impurities with high boiling point, the temperature is required to be 200...

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Abstract

The present invention discloses a refining process method for producing anhydrous aluminum chloride through high aluminum fly ash, wherein high aluminum fly ash (the alumina content is more than or equal to 25%) is adopted as a raw material, a carbon value reducing agent is matched, chlorine gas is introduced to carry out a chlorination reaction, and the mixed gas discharged from a chlorination furnace is subjected to treatments such as cooling, distillation and rectification to prepare the anhydrous aluminum chloride product meeting the national standard. The method of the present invention has characteristics of cheap and easily available raw material, high product purity, easy large-scale industrial production, and the like.

Description

Technical field [0001] The invention relates to a refining process for producing anhydrous aluminum chloride from high-aluminum fly ash, and belongs to the field of comprehensive utilization of fly ash. Background technique [0002] Fly ash is the solid waste discharged from coal-fired power plants after coal is burned in the boiler, and it is also the largest industrial waste in my country. Usually burning 1 ton of coal produces 20-30% of fly ash. At present, my country’s annual discharge of fly ash is about 400 million tons, and the accumulated stock of fly ash is more than 2 billion tons, which seriously pollutes the environment and wastes resources. The alumina content in fly ash is usually 40-50%, which is equivalent to the alumina content in bauxite. It is urgent to find an economical and reasonable method to enable comprehensive utilization. [0003] At present, the domestic preparation method of anhydrous aluminum chloride is mainly direct chlorination with aluminum ingots...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/58
Inventor 杨鑫
Owner GUIYANG AL-MG DESIGN & RES INST
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