Eureka AIR delivers breakthrough ideas for toughest innovation challenges, trusted by R&D personnel around the world.

Chlorosilane-containing slurry treatment method and chlorosilane-containing slurry treatment system

A treatment method and technology of a treatment system are applied in the field of chlorosilane-containing slag slurry treatment method and treatment system, which can solve the problems of high price and later maintenance costs, blockage of conveying equipment and pipelines, and short continuous operation period of the system, and achieve The effect of short investment recovery period, low operation and maintenance cost, and long continuous operation period

Pending Publication Date: 2018-11-06
青海黄河上游水电开发有限责任公司新能源分公司 +2
View PDF6 Cites 6 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

After the slurry is concentrated, due to the reduction of liquid phase chlorosilane and the presence of silicon powder and high-boiling metal chlorides, its fluidity becomes poor, especially under the conditions of long pipelines and low temperatures, metal chlorides And silicon powder will be deposited on the pipe wall of the conveying pipeline, often causing the blockage of conveying equipment and pipeline, affecting the normal process operation; (2) In the dry hydrolysis method, the metal chloride in the slurry is also evaporated and recovered in large quantities, so that the subsequent The product quality of the rectification unit is reduced
This method is acceptable in the production process of solar-grade polysilicon, but in the production process of electronic-grade polysilicon, because electronic-grade polysilicon has very strict requirements on the surface metal and bulk metal content of the product, this method cannot meet its production requirements; (3) Due to the particularity of the properties of chlorosilane, the safety requirements of the equipment in the production process are high
In the application of this method, the shaft end seal of the dryer is often not tightly sealed, causing chlorosilane leakage, which has certain safety hazards and causes the system to run continuously for a short period; (4) in the drying hydrolysis method, the dryer is The core components of this technology have relatively high prices and post-maintenance costs. For polysilicon manufacturers with small production capacity, the investment recovery period is too long

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Chlorosilane-containing slurry treatment method and chlorosilane-containing slurry treatment system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0108] A method for treating chlorosilane-containing slag slurry, comprising the following steps:

[0109] Set up a vertical 20m next to the washing tower 3 The slag slurry collection tank, the chlorosilane-containing slag slurry discharged from the cold hydrogenation system enters the slag slurry collection tank, and the top of the tank is vented to the cold hydrogenation process vent system. The slag slurry of the two production lines (two sets of cold hydrogenation units) is discharged into the collection tank for static separation. Stop discharging after discharging to 80% of the collection tank volume, about 23 tons. After standing still for about 4 hours, the incompatibility and density difference of the components in the slag slurry are used to make the slag slurry form a supernatant liquid and a bottom turbid liquid in the collection tank.

[0110] The supernatant is discharged from multiple chlorosilane outlets of different heights set on the slag slurry collection ...

Embodiment 2

[0114] Such as figure 1 As shown, a chlorosilane-containing slag slurry treatment system includes a slag slurry collection tank 1, a filter 2, a delivery pump 3, a chlorosilane recovery device 4 and a washing device 5;

[0115] The slag slurry collection tank 1 is provided with a slag slurry inlet 11, a plurality of chlorosilane outlets 12 of different heights and a bottom outlet 13;

[0116] The chlorosilane discharge port 12 is connected to the chlorosilane recovery device 4 through the filter 2 and the delivery pump 3 in sequence;

[0117] The outlet 13 at the bottom of the slurry collection tank is connected to the washing device 5 .

[0118] Wherein, the slag slurry feed port 11 is connected with the slag slurry discharge port 7 of the cold hydrogenation system through a pipeline.

[0119] The arrangement of multiple chlorosilane outlets 12 of different heights includes:

[0120] The first outlet is set at the first position, and the height between the first position a...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention belongs to the technical field of polycrystalline silicon production, and relates to a chlorosilane-containing slurry treatment method and a chlorosilane-containing slurry treatment system. The chlorosilane-containing slurry treatment method disclosed by the invention comprises the following steps: chlorosilane-containing slurry gets into a slurry collection tank, and is kept still,and by utilizing the incompatibility and density difference between components in the slurry, the slurry is formed into supernate and bottom turbid liquid in the slurry collection tank; the supernateis discharged out from a plurality of chlorosilane outlets which are arranged at different heights on the slurry collection tank, sequentially passes through a filter and a delivery pump, and gets into a chlorosilane recovery device; and the bottom turbid liquid gets into a washing device from the bottom outlet of the slurry collection tank under the effect of pressure difference and is washed. According to the invention, the chlorosilane recovery rate is high, the quality of recovered chlorosilane is better, and the requirement of electronic-grade polycrystalline silicon production on qualitycan be met. Moreover, the investment of the process is low, safety is good, the continuous operation period is long, later operation and maintenance costs are low, the investment recovery period is short, and risk is low.

Description

technical field [0001] The invention belongs to the technical field of polysilicon production, and relates to the technical field of slag slurry treatment in the polysilicon production process, in particular to a chlorosilane-containing slag slurry treatment method and a treatment system. Background technique [0002] In the production process of electronic grade polysilicon, the slag slurry mainly comes from the hydrogenation reduction of silicon tetrachloride, the synthesis of trichlorosilane, the separation and purification of chlorosilane, etc., especially the cold hydrogenation process, the slag discharged from the cold hydrogenation unit and the separation and purification unit The amount of slurry is greatly increased. During the production process of the cold hydrogenation process, a slag slurry mainly composed of chlorosilane, silicon powder and metal chloride will be produced. There are currently four main methods for the treatment of the slag slurry: direct hydrol...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/107C01B33/03
CPCC01B33/03C01B33/10778C01P2006/80
Inventor 刘铭朱顺云胥五一郑永良王金宝刘虹宾刘永生孙康朱发磊危胜杜斌功
Owner 青海黄河上游水电开发有限责任公司新能源分公司
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Eureka Blog
Learn More
PatSnap group products