Method for directly producing aluminum fluoride by fluorosilicic acid

A technology of aluminum fluoride and fluorosilicic acid, used in aluminum fluoride, aluminum halide, silicon oxide, etc., can solve the problems of flooding and wrapping, and achieve the effects of convenient measurement, low aluminum content, and high Al recovery rate

Inactive Publication Date: 2019-10-11
KUNMING CHUAN JINNUO CHEM IND
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Problems solved by technology

[0004] The purpose of the present invention is to solve the flooding and wrapping phenomenon in the reaction process of aluminum hydroxide powder and fluosilicic acid in the process of producing aluminum fluoride by the

Method used

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  • Method for directly producing aluminum fluoride by fluorosilicic acid
  • Method for directly producing aluminum fluoride by fluorosilicic acid
  • Method for directly producing aluminum fluoride by fluorosilicic acid

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Experimental program
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Embodiment

[0024] 1) Pre-slurry the aluminum fluoride crystallization filtrate and aluminum hydroxide at a mass ratio of 1.5:1 to obtain aluminum hydroxide slurry, and the slurry temperature is 48°C;

[0025] 2) Pump the measured aluminum hydroxide slurry into the measured fluosilicic acid solution preheated to 85°C for reaction, the excess of fluosilicic acid is 3%, the feeding time is 4min, and the fluosilicic acid in the fluosilicic acid solution ( h 2 SiF 6 ) mass percent 20.73%, F / Si molar ratio 5.3, P 2 o 5 The mass percentage is 0.007%, the reaction temperature is 93°C, and the reaction time (after feeding) is 17min;

[0026] 3) After the reacted slurry is filtered and washed, wet silica filter cake, filtrate and washing water are obtained;

[0027] 4) After the filtrate and washing water are combined, crystallize at 95°C, and the crystallization time is 4.5h;

[0028] 5) After crystallization, cool down the slurry to 60°C, filter and wash to obtain wet aluminum fluoride and ...

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Abstract

The invention relates to a method for directly producing aluminum fluoride by fluorosilicic acid. A phosphoric acid industrial by-product, namely, fluorosilicic acid, aluminum hydroxide and an aluminum fluoride crystallization mother liquor are adopted as raw materials, the aluminum fluoride crystallization mother liquor is adopted for pre-adjusting aluminum hydroxide powder into slurry, the slurry is pumped into a pre-heated fluorosilicic acid solution for a reaction, and an aluminum fluoride product is obtained after desiliconization, crystallization, drying and calcination. On the premise of not changing the reaction rate of the aluminum hydroxide and the fluorosilicic acid, the crystallization mother liquor and the aluminum hydroxide pre-adjusted slurry are recycled, so that the aluminum hydroxide fully reacts with the fluorosilicic acid, an encapsulation phenomenon generated in the direct reaction process of the aluminum hydroxide powder and the fluorosilicic acid and a channel overflowing phenomenon caused by excessive foam are avoided, and a production technology with high utilization rate of aluminum, smooth process and stable operation is provided for directly producing the aluminum fluoride by the fluorosilicic acid.

Description

technical field [0001] The invention belongs to the technical field of chemical industry inorganic fluoride production, and in particular relates to a method for producing aluminum fluoride by a direct method of fluosilicic acid. Background technique [0002] Aluminum fluoride is a flux in the aluminum smelting industry, which can greatly reduce the melting point of alumina. The aluminum fluoride used in the domestic aluminum smelting industry is mostly produced by the fluorite method. With the advancement of the national ecological civilization construction, the protection of fluorite resources has been increased. In recent years, more and more manufacturers have begun to use wet-process phosphoric acid. The by-product produces aluminum fluoride for the aluminum smelting industry. The representative processes for the production of aluminum fluoride from fluorosilicic acid mainly include the ammonia method and the direct method. The direct method has been widely used becaus...

Claims

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Application Information

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IPC IPC(8): C01F7/50C01B33/12
CPCC01B33/12C01F7/50C01P2006/10
Inventor 曾润国葛云松
Owner KUNMING CHUAN JINNUO CHEM IND
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