A kind of granular cryolite and preparation method for regulating its molecular ratio

A cryolite and granular technology, which is applied in the field of granular cryolite and its preparation, can solve the problems of fragile granular ice and high cost, and achieve the effects of stable quality, simple control, and reduced production costs

Inactive Publication Date: 2017-07-28
HUNAN NONFERROUS FLUORIDE CHEM
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  • Description
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  • Application Information

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Problems solved by technology

[0004] The cryolite produced by the disclosed technical schemes such as CN1259242C, CN1043033C, CN1225897A, CN1300879A, CN1260130C are all powdery cryolite, to produce granular cryolite must carry out post-pressing, not only cost rises, and the granular ice that dry product is pressed out is easy Another technical defect in the production of cryolite by the above scheme is that the molecular ratio cannot be adjusted in the production process, some can only produce cryolite with high molecular ratio, and some can only produce cryolite with ordinary molecular ratio

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  • A kind of granular cryolite and preparation method for regulating its molecular ratio

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reference example 1

[0034] The preparation method of the seed crystal solution obtained by preliminary ammonolysis of sodium fluorosilicate: mix 600kg sodium fluorosilicate with 14m 3 Cryolite mother liquor (concentration of main components: F: 8.4g / L, Na: 4.1g / L, NH 4 + : 22.4g / L, specific gravity 1.05), stir the ingredients in the reaction tank, add ammonia water until the pH value is 7, age for 40min, and serve.

[0035] The preparation method of sodium aluminate solution: prepare 4.4m 3 Sodium hydroxide solution with a mass concentration of 33.2wt% was heated to 110°C by steam, 3000kg of aluminum hydroxide was added, and the reaction was stirred until the solution was clear to obtain a sodium aluminate solution (among them, the concentration of Al was 198.72 g / L, and the concentration of Na is 218.96 g / L, caustic ratio is 1.29).

reference example 2

[0037] The preparation method of sodium aluminate solution: prepare 4.4m 3 Sodium hydroxide solution with a mass concentration of 33.1wt% was heated to 115°C by steam, 3000kg of aluminum hydroxide was added, and the reaction was stirred until the solution was clear to obtain a sodium aluminate solution (among them, the concentration of Al was 197.37 g / L, and the concentration of Na is 212.98 g / L, and the caustic ratio is 1.2).

reference example 3

[0039] The preparation method of sodium aluminate solution: prepare 4.4m 3 A sodium hydroxide solution with a mass of 32.4wt% was heated to 120°C by steam, 3000kg of aluminum hydroxide was added, and the reaction was stirred until the solution was clear to obtain a sodium aluminate solution (wherein, the concentration of Al was 185.44g / L, and the concentration of Na was 196.88 g / L, caustic ratio is 1.25).

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Abstract

The invention discloses granular cryolite and a preparation method capable of regulating and controlling a molecular ratio thereof. The cryolite is mainly composed of, by mass, 52-55% of F, 12-15% of Al and 28-33% of Na according to a molecular ratio of 2.0-3.0, the cryolite is naturally granulated, and weight of the cryolite less than 1mm in grain diameter is less than or equal to 15%. The preparation method includes following steps: (1), adding sodium fluosilicate into cryolite mother liquid, adding ammonia water to enable pH value to be 8.0-9.5, and performing press filtering to obtain a sodium fluoride and ammonium fluoride mixed solution; (2), adding the sodium fluoride and ammonium fluoride mixed solution and a sodium aluminate solution into a synthesis tank to obtain cryolite slurry; (3), adding an aluminum-based compound into the cryolite slurry, and performing stirring reaction, solid-liquid separation and drying to obtain the granular cryolite. The granular cryolite is adjustable in the molecular ratio within a range of 2.0-3.0. The preparation method is simple, convenient and easy to operate, and the cryolite mother liquid is recyclable, low in energy consumption and low in pollution.

Description

technical field [0001] The invention relates to a granular cryolite and a preparation method thereof, in particular to a granular cryolite and a preparation method capable of regulating its molecular ratio. Background technique [0002] The chemical name of cryolite is sodium fluoroaluminate, and the molecular formula is Na 3 AlF 6 . Cryolite can be divided into natural and man-made. It is mainly used as a flux for electrolytic aluminum smelting, a wear-resistant filler for rubber and grinding wheels, a whitening agent for enamel, and a flux for metals in industry. The traditional process of sodium cryolite production is the fluoroaluminate soda ash method, and the emerging processes include the clay brine method and the sodium fluorosilicate method. [0003] However, as a new technology, the sodium fluorosilicate method has certain disadvantages: in the process of producing cryolite with sodium fluorosilicate, since the caustic ratio of sodium aluminate used cannot reach...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F7/54
CPCC01F7/54C01P2004/51
Inventor 王晓玲刘龙平陈华何志仁周伟梁星李文英
Owner HUNAN NONFERROUS FLUORIDE CHEM
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