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Process and apparatus for converting spent potliners into a glass frit, and resulting products

A waste tank lining and glass technology, applied in fluorine/hydrogen fluoride, solid waste management, silicon halide compounds, etc., can solve the problem of not being able to provide captured fluorine

Inactive Publication Date: 2008-02-06
NUOVOFORD INT
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  • Application Information

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Problems solved by technology

These patents fail to provide methods for efficiently capturing fluorine in frits and separating carbon by physical means

Method used

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  • Process and apparatus for converting spent potliners into a glass frit, and resulting products
  • Process and apparatus for converting spent potliners into a glass frit, and resulting products
  • Process and apparatus for converting spent potliners into a glass frit, and resulting products

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Embodiment Construction

[0057] The present invention generally provides the conversion of spent tank lining (SPL) or other hazardous materials from the aluminum manufacturing industry into commercially available glass frits of amorphous sodium and calcium fluoroaluminosilicates (e.g., currently under the trademark for CAlSiFrit  ) and high-carbon materials (for example, currently under the trademark CAlSiCoke  of) pyrometallurgical methods and devices. The spent tank liner, calcium oxide source and silicate source are fed into the non-burner end of the counter-current rotary kiln. The raw material is heated to destroy the cyanide, convert the fluoride salt to calcium fluoride and form a homogeneous liquid mass. Carbon is then physically separated from the feed in a fixed bed furnace in series with a rotary kiln, and the feed is vitrified. Both the rotary kiln and the fixed bed furnace are connected to the waste gas treatment system.

[0058] The term "waste tank liner" is known in the art. The...

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Abstract

The present invention relates to a fire metallurgy method for converting the waste slot liner or other harmful material from the aluminum production industry to the glass clinker clew of amorphous fluorine-bearing sodium aluminosilicate and amorphous fluorine-bearing aluminum calcium silicate and converting to the high-carbon material and the device. The raw materials of waste slot liner, silicon dioxide or siliceous material and calcium oxide are added to the non-burner end of the counterflow rotary burner. The material is heated to destroy the cyanide, the salt fluoride is converted to calcium fluoride and forms a homogeneous liquid material. Then the carbon is physically separated from the material. Afterwards the material is glassed to generate the valuable glass clinker clew and high-carbon material.

Description

technical field [0001] The present invention generally relates to the treatment of spent tank linings or other hazardous materials from the aluminum manufacturing industry. In particular, the invention relates to a pyrometallurgical method and apparatus for converting spent tank linings into glass frits and to the products obtained by this method. Background technique [0002] During aluminum production, alumina is dissolved in cryolite in electrolytic cells or cells, which are steel shells protected by refractory materials and lined with carbon. Many cells, usually over 100, are arranged in series to form a column of electrolytic cells. The tank is filled mainly with cryolite (Na 3 AlF 6 ) composed of a molten electrolyte and operated at about 930 to 1000°C. Other materials are added to the electrolyte to improve operating efficiency or reduce energy consumption, such as alumina, aluminum fluoride, sodium fluoride, soda ash, calcium fluoride, lithium carbonate, and magn...

Claims

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Application Information

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IPC IPC(8): C04B28/00C04B28/04C04B28/08C04B18/04C03C8/14C01F11/22C01B33/08C01B7/20A62D3/00
CPCY02W30/91
Inventor 盖伊·让德龙安德烈·戈瑟兰迪米特里·希拉德皮埃尔·拉维涅
Owner NUOVOFORD INT
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