Process for preparing industrial aluminium fluoride from acidic aluminium slag

A technology of aluminum fluoride and aluminum acid, applied in the field of chemical industry, can solve the problems of large number of equipment, complex process and high cost, and achieve the effect of using less equipment, simple process and small investment

Inactive Publication Date: 2002-12-04
周民强
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  • Abstract
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Problems solved by technology

These two methods have complex processes and a large number of equipment, especially the dry aluminum fluoride production, which requires large investment and high cost.

Method used

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  • Process for preparing industrial aluminium fluoride from acidic aluminium slag
  • Process for preparing industrial aluminium fluoride from acidic aluminium slag

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Embodiment Construction

[0011] The present invention is described in further detail below in conjunction with accompanying drawing:

[0012] 1. The formation of acid aluminum slag:

[0013] The definition of acid aluminum slag: refers to the solid mixture (mainly containing fluorine elements, aluminum elements, ammonium root) formed after the surface acid corrosion of aluminum profiles with chemical corrosion solution, which is called acid aluminum slag.

[0014] The aluminum profile industry uses a large amount of aluminum ingots, which are converted into aluminum profiles by adding a small amount of silicon powder. The surface of the extruded aluminum profile is a layer of aluminum oxide, which has a metallic luster and is not beautiful. The surface needs to be treated with acid or alkaline chemical mixture for surface corrosion. The acid corrosion method developed in recent years has a good effect. Almost all aluminum profiles now require surface chemical corrosion treatment, most of which are ac...

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Abstract

A process for preparing industrial aluminium fluoride from acidic aluminium dregs, which is the waste generated in producing aluminium section and contains ammonium fluoaluminate, other ammonium salts and ferrosilicon, includes pulverizing dried raw material, adding the mixed solution of HF 1-30% and HCl 1-30%, stirring at temp from ordinary temp 80 deg.C for 60-90 min while reaction of ferrosilicon compound on HF and HCl, filtering for separating raw material from mother liquid, washing in clean water, dripdrying, baking at 120 deg.C for 1 hr, grinding, decomposing at 500-800 deg.C for 40-60min, and cooling. Its advantages are simple process and recovering ammonium fluoride as by-product.

Description

(1) Technical field: [0001] The invention relates to the chemical industry, in particular to a method for preparing industrial aluminum fluoride from acid aluminum slag. (two) background technology: [0002] Industrial aluminum fluoride is generally white crystal or powder, which is used as an electrolytic bath component in the electrolysis industry to lower the melting point and increase the conductivity of the electrolyte. At present, the production of aluminum fluoride is divided into dry method and wet method, but no matter which method is used, the aluminum element comes from aluminum hydroxide or aluminum oxide, and the fluorine element comes from the hydrogen fluoride produced by the reaction of fluorite and sulfuric acid. These two methods have complex processes and a large number of equipment, especially the dry aluminum fluoride production, which requires large investment and high cost. (3) Contents of the invention: [0003] The purpose of the present invention...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09B3/00C01F7/50
Inventor 周民强周国富
Owner 周民强
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