CN206666147U - A kind of recycling equipment of silicon tetrachloride as by-product of polysilicon - Google Patents
A kind of recycling equipment of silicon tetrachloride as by-product of polysilicon Download PDFInfo
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- CN206666147U CN206666147U CN201621022679.5U CN201621022679U CN206666147U CN 206666147 U CN206666147 U CN 206666147U CN 201621022679 U CN201621022679 U CN 201621022679U CN 206666147 U CN206666147 U CN 206666147U
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- storage tank
- silicon tetrachloride
- deionized water
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Abstract
It the utility model is related to a kind of recycling equipment of silicon tetrachloride as by-product of polysilicon, including consersion unit and equipment for after-treatment, consersion unit includes silicon tetrachloride storage tank, deionized water dispersant storage tank, Venturi tube, the output end of silicon tetrachloride storage tank is connected with the input pipeline of inlet cylinders section, the output end of deionized water dispersant storage tank and the input pipeline of cylindrical throat connect, the output end of circular cone diffuser is connected with the input pipeline of silicon tetrachloride storage tank, and equipment for after-treatment includes box filter, spray drying tower and sack cleaner.The beneficial effects of the utility model are：Reaction condition is gentle, safely controllable, can obtain different aggregation particle diameters and the silica product of specific surface area by controlling the parameter such as four silica flow velocitys and deionized water velocity ratio, dispersant dosage and spray drying temperature to control properties of product；Promote polysilicon industry health to develop rapidly, reduce environmental pollution, energy-saving and emission-reduction.
Description
Technical field
It the utility model is related to a kind of recycling equipment of silicon tetrachloride as by-product of polysilicon.
Background technology
In recent years, as the development of polysilicon industry, the process problem of its silicon tetrachloride as by-product become increasingly conspicuous.According to system
Meter, often produce 1 ton of about 10~15 tons of polysilicon by-produced tetrachlorosilane.Silicon tetrachloride is a kind of poisonous and harmful with severe corrosive
Liquid, to safety and environmental protection it is very harmful, how effectively to solve polysilicon industry silicon tetrachloride as by-product processing ask
Topic, had great significance for the development and the Implement of sustainable development strategy for promoting photovoltaic industry.
At present, the processing to silicon tetrachloride as by-product of polysilicon mainly has two approach：First, by polysilicon by-product four
The products such as silester, organosilicon are made in silicon chloride, but digestion amount of these methods to silicon tetrachloride is too small, and are often consuming
New environmental pollution is produced while waste again；Another way be by silicon tetrachloride as by-product of polysilicon hydrogenation be trichlorine hydrogen
Silicon, return to synthesis procedure and recycled, this processing mode has investment big, high energy consumption, the low, complex procedures of conversion ratio etc.
Shortcoming.Processing silicon tetrachloride mainly also has two methods in the world：One of method is to be gone back at high temperature under high pressure using hydrogen
Originally it was the primary raw material trichlorosilane of polysilicon, the two of method is the gas-phase silica using silicon tetrachloride production high added value.
Such as German watt gram, day the Bender mountain of external main polysilicon company had not only produced polysilicon but also raw using later approach
White carbon is produced, gas-phase silica and production of polysilicon are combined closely, forms the circulating economy chain that a resource utilizes mutually, it is real
Existing resource circulation utilization.
The domestic technique that gas-phase silica is produced using silicon tetrachloride as raw material is in the starting stage, and some critical processes are grasped
Abroad in a small number of major company's hands.And the method equipment investment is big, production cost is higher, constrains its product promotion.Therefore,
Find a kind of simple production process, equipment investment is small, product cost is low new method solves the recycling of silicon tetrachloride
Problem is imperative.
In recent years precipitated silica due to simple production process, equipment investment is small, product cost is low and to environment without dirt
The features such as dye is considered as the new way for solving the problems, such as silicon tetrachloride recycling.Preparing white carbon black by precipitation method is with industry water
Glass and sulfuric acid (or hydrochloric acid) are raw material to prepare white carbon.If Chinese invention patent ZL 200910227609.1 is by four chlorinations
Silicon is slowly added in water, and reaction is hydrolyzed, while adds appropriate dispersant, is prepared precipitated silica, in course of reaction
Caused hydrogen chloride can be used for production polyvinyl chloride or trichlorosilane after carrying out gas phase recovery；Chinese invention patent CN
Silicon tetrachloride is added dropwise in being reacted in water or alkaline solution 101712476A, and precipitated silica is prepared；Middle promulgated by the State Council
Bright patent ZL201110086493.1 mixes silicon tetrachloride with solvent naphtha and water, reaction generation precipitated silica；Chinese invention
Silicon tetrachloride is added dropwise in the water glass solution after dilution patent CN 102659118A, reaction generation precipitated silica.It is above-mentioned
Although patent can prepare precipitated silica, exist and react the too drastic white carbon particle diameter for being difficult to control, being prepared
Greatly, the shortcomings of poor activity, how to make that reaction is gentle, white carbon particle diameter is small and it is active it is big be always the difficulty for preparing precipitated silica
Topic.
Using venturi-type devices, by the way that silicon tetrachloride is prepared into precipitation hard charcoal with deionized water hybrid reaction
It is black, there is the features such as reaction is gentle controllable, and obtained white carbon particle diameter is small, and specific surface area is big, activity is big.
Utility model content
The technical problems to be solved in the utility model is：Based on above mentioned problem, there is provided a kind of chlorination of polysilicon by-product four
The recycling equipment of silicon.
Technical scheme is used by the utility model solves its technical problem：A kind of silicon tetrachloride as by-product of polysilicon
Recycling equipment, including consersion unit and equipment for after-treatment, consersion unit includes silicon tetrachloride storage tank, deionized water is disperseed
Agent storage tank, Venturi tube, Venturi tube include inlet cylinders section, circular cone contraction section, cylindrical throat and the circular cone being sequentially connected
Diffuser, the output end of silicon tetrachloride storage tank are connected with the input pipeline of inlet cylinders section, deionized water dispersant storage tank
The input pipeline of output end and cylindrical throat connects, the output end of circular cone diffuser and the input end pipe of silicon tetrachloride storage tank
Road is connected, and the mechanical pump for controlling its flow velocity, rear place are provided with the pipeline between the output end and input of silicon tetrachloride storage tank
Reason equipment includes box filter, spray drying tower and sack cleaner.
Further, deionized water dispersant storage tank is built with deionized water and the mixed solution of dispersant, deionized water
Pipeline between dispersant storage tank and cylindrical throat is provided with control valve.
The beneficial effects of the utility model are：(1) directly produced using deionized water as raw material, rather than traditional alkali
Water, energy consumption of reaction reduce, and security greatly improves；(2) reaction condition is gentle, safely controllable, can be by controlling four silica streams
Speed and the parameter such as deionized water velocity ratio, dispersant dosage and spray drying temperature control properties of product, obtain different aggregations
The silica product of particle diameter and specific surface area；(3) silica of accessory substance four in production of polysilicon is used as raw materials for production
Precipitated silica is prepared, efficiently solves that the silica of accessory substance four in polysilicon industry is difficult to handle, recycling is low, dirty
The problem of big is contaminated, the health for promoting polysilicon industry develops rapidly, reduces environmental pollution, energy-saving and emission-reduction.
Brief description of the drawings
The utility model is further illustrated below in conjunction with the accompanying drawings.
Fig. 1 is structured flowchart of the present utility model；
Wherein：1. silicon tetrachloride storage tank, 2. deionized water dispersant storage tanks, 3. Venturi tubes, 3-1. inlet cylinders sections, 3-
2. circular cone contraction section, 3-3. cylindrical throats, 3-4. circular cone diffusers, 4. circular cone diffusers, 5. box filters, 6. sprayings are dry
Dry tower, 7. sack cleaners, 8. control valves.
Embodiment
The utility model is further described presently in connection with accompanying drawing.These accompanying drawings are simplified schematic diagram only to show
Meaning mode illustrates basic structure of the present utility model, therefore it only shows the composition relevant with the utility model.
A kind of recycling equipment of silicon tetrachloride as by-product of polysilicon as shown in Figure 1, including consersion unit is with after
Processing equipment, consersion unit include silicon tetrachloride storage tank 1, deionized water dispersant storage tank 2, Venturi tube 3, and Venturi tube 3 is wrapped
Include the inlet cylinders section 3-1 being sequentially connected, circular cone contraction section 3-2, cylindrical throat 3-3 and circular cone diffuser 3-4, silicon tetrachloride
The output end of storage tank 1 is connected with inlet cylinders section 3-1 input pipeline, the output end and circle of deionized water dispersant storage tank 2
Tubular throat 3-3 input pipeline connection, circular cone diffuser 3-4 output end and the input pipeline of silicon tetrachloride storage tank 1
Connect, the mechanical pump 4 for controlling its flow velocity, rear place are installed on the pipeline between the output end and input of silicon tetrachloride storage tank 1
Reason equipment includes box filter 5, spray drying tower 6 and sack cleaner 7.
Deionized water dispersant storage tank 2 is built with deionized water and the mixed solution of dispersant, the storage of deionized water dispersant
Pipeline between tank 2 and cylindrical throat 3-3 is provided with control valve 8.
Using a kind of resource utilization method of silicon tetrachloride as by-product of polysilicon of the equipment, comprise the following steps：
(1) at room temperature, dispersant is added in deionized water, be uniformly mixed, be put in the storage of deionized water dispersant
Tank is standby；
(2) silicon tetrachloride liquid in silicon tetrachloride storage tank is added into entering for venturi tube inlet cylindrical section by mechanical pump
Mouthful, the mixed solution of deionized water and dispersant is introduced from Venturi tube cylindrical throat, makes silicon tetrachloride and deionized water
Being reacted in Venturi tube, the mixture of Venturi tube circular cone diffuser opening discharge is back in silicon tetrachloride storage tank,
Circular response is carried out, the chemical equation of silicon tetrachloride and deionized water is：SiCl4+2H2O=SiO2+4HCl；
(3) until the mixed solution of deionized water and dispersant all adds, mixture is aged in silicon tetrachloride storage tank,
Obtain solidliquid mixture；
(4) solidliquid mixture that step (3) obtains is delivered into storage tank, filtered by box filter, deionization washing
Wash, obtain filter cake and raffinate；
(5) filter cake for obtaining step (4) adds deionized water, is made into slurry, and slurry is sent by pumping to spray drying tower,
After heated-air drying, it is collected by filtration by sack cleaner, obtains white carbon.
The specific surface area of the white carbon of preparation is 500~800m2/ g, particle diameter are 200~400nm, and its analysis of components detects
Meet People's Republic of China's light industry food white carbon QB/T2346-2007 standards.
Using it is above-mentioned according to desirable embodiment of the present utility model as enlightenment, pass through above-mentioned description, related work people
Member can carry out various changes and amendments in the range of without departing from this item utility model technological thought completely.This item is real
The content being not limited to new technical scope on specification, it is necessary to which its technology is determined according to right
Property scope.
Claims (2)
1. a kind of recycling equipment of silicon tetrachloride as by-product of polysilicon, it is characterized in that：Including consersion unit and post processing
Equipment, consersion unit include silicon tetrachloride storage tank (1), deionized water dispersant storage tank (2), Venturi tube (3), Venturi tube
(3) inlet cylinders section (3-1), circular cone contraction section (3-2), cylindrical throat (3-3) and the circular cone diffuser being sequentially connected are included
(3-4), the output end of silicon tetrachloride storage tank (1) are connected with the input pipeline of inlet cylinders section (3-1), deionized water dispersant
The output end of storage tank (2) is connected with the input pipeline of cylindrical throat (3-3), the output end and four of circular cone diffuser (3-4)
The input pipeline of silicon chloride storage tank (1) connects, and is installed on the pipeline between the output end and input of silicon tetrachloride storage tank (1)
There is the mechanical pump (4) for controlling its flow velocity, equipment for after-treatment includes box filter (5), spray drying tower (6) and sack cleaner
(7)。
2. a kind of recycling equipment of silicon tetrachloride as by-product of polysilicon according to claim 1, it is characterized in that：Institute
The deionized water dispersant storage tank (2) stated is built with deionized water and the mixed solution of dispersant, deionized water dispersant storage tank
(2) pipeline between cylindrical throat (3-3) is provided with control valve (8).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621022679.5U CN206666147U (en) | 2016-08-31 | 2016-08-31 | A kind of recycling equipment of silicon tetrachloride as by-product of polysilicon |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621022679.5U CN206666147U (en) | 2016-08-31 | 2016-08-31 | A kind of recycling equipment of silicon tetrachloride as by-product of polysilicon |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206666147U true CN206666147U (en) | 2017-11-24 |
Family
ID=60356149
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201621022679.5U Expired - Fee Related CN206666147U (en) | 2016-08-31 | 2016-08-31 | A kind of recycling equipment of silicon tetrachloride as by-product of polysilicon |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206666147U (en) |
-
2016
- 2016-08-31 CN CN201621022679.5U patent/CN206666147U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20171124 Termination date: 20190831 |