Method and device for separating magnesium chloride hexammoniate during silane production by the magnesium silicide method

A technology of hexaammoniated magnesium chloride and magnesium silicide, which is applied in the field of separation and recovery of hexaammoniated magnesium chloride and liquid ammonia, can solve the problems of insufficient ammonia recovery, small production scale, and environmental pollution, and achieve high efficiency, fast speed, solid liquid retention less effect

Active Publication Date: 2010-09-01
JIANGSU YANGNONG CHEM GROUP +1
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Problems solved by technology

[0008] The purpose of the present invention is to provide a method for the recovery and utilization of liquid ammonia and magnesium chloride hexaammoniated suspension produced in the process of producing silane by the current magnesium silicide method, which has the disad

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  • Method and device for separating magnesium chloride hexammoniate during silane production by the magnesium silicide method
  • Method and device for separating magnesium chloride hexammoniate during silane production by the magnesium silicide method
  • Method and device for separating magnesium chloride hexammoniate during silane production by the magnesium silicide method

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[0038] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0039] The separation and recovery device of hexaammoniated magnesium chloride and liquid ammonia in the process of producing silane by the magnesium silicide method of the present invention comprises a salt mud extraction pump 3, a salt mud middle tank 4, a salt mud filtration pump 5, a filter 6, and a salt mud feeder 7 , screw dryer 8, condenser 10, liquid ammonia storage tank 1, liquid ammonia recovery tank 11, liquid ammonia recovery pump 12 and magnesium chloride packaging machine 9, the outlet of salt mud extraction pump 3 is connected with the top of salt mud middle tank 4, The salt mud middle tank 4 is equipped with a stirring device, the lower outlet of the salt mud middle tank 4 is connected with the salt mud filter pump 5, and the outlet of the salt mud filter pump 5 is connected with the salt mud filter 6, and the filter 6 is a clo...

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Abstract

The invention discloses a method for separating and recycling magnesium chloride hexammoniate and liquid ammonia during silane production by a magnesium silicide method, which comprises the following process steps of: inputting the magnesium chloride hexammoniate and liquid ammonia salt slurry produced during silane production by the magnesium silicide method into a filter; inputting the liquid ammonia coming out of the top of the filter into a liquid ammonia storage tank for recycle; conveying the salt slurry coming out of the lower part of the filter into a dryer through a salt slurry feeder; conveying the ammonia gas coming out of the upper part of the dryer into a condenser to liquefy the ammonia gas in the condenser in which the temperature is lower than 33.5 DEG C below zero; and inputting the ammonia gas into the liquid ammonia storage tank for recycle. The invention further discloses a device implementing the method. With the device and method, the invention realizes large-scale industrial production, and magnesium chloride hexammoniate and liquid ammonia are separated and recycled through a continuous liquid-solid filter with fast separation, high efficiency and little liquid in solid. In addition, the filtered wet magnesium chloride hexammoniate is continuously dried at high temperature with high drying efficiency, and the complex ammonia is effectively recycled.

Description

technical field [0001] The invention belongs to the technical field of polysilicon, and relates to the recovery of by-products of silane production, in particular to a method and a device for separating and recovering magnesium chloride hexaammoniate and liquid ammonia produced in the process of producing silane by a magnesium silicide method. Background technique [0002] Silane is widely used in the epitaxial deposition of monocrystalline silicon films and the production of polycrystalline silicon films, the manufacture of amorphous silicon solar cells and photosensitive parts of copiers, the replacement of traditional toner cartridges with silicon drums, and the production of brown glass in the glass industry. In addition, silane and ethylene can produce silicon carbide ultrafine powder under laser activation, and silane and ammonia can produce silicon nitride ultrafine powder under laser activation. With the rapid development of the photovoltaic industry, the domestic de...

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Application Information

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IPC IPC(8): C01C1/02C01F5/30
Inventor 李群张晓薇顾克军祁宏祥吴海浪张晓谕蒋智慧殷恒志
Owner JIANGSU YANGNONG CHEM GROUP
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