Unlock instant, AI-driven research and patent intelligence for your innovation.

Systems and methods for activating and drying silica fume and catalyst

A catalyst and silicon powder technology, applied in chemical instruments and methods, silicon compounds, halogenated silicon compounds, etc., can solve problems such as affecting normal production, long activation and drying time, uneven temperature distribution, etc., to ensure safety and stability. , The effect of shortening the activation drying time and improving the activation drying efficiency

Active Publication Date: 2015-12-02
CHINA ENFI ENGINEERING CORPORATION
View PDF4 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the past, the activation and drying of silicon powder and catalyst used induction heating or steam heating on the outer wall of the dryer to raise the internal temperature to the activation drying temperature. Due to the extremely poor thermal conductivity of silicon powder, these methods have low heating efficiency and slow temperature rise. Moreover, the temperature distribution is uneven and the energy consumption is high; the activation and drying time is long, which affects normal production

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
  • Systems and methods for activating and drying silica fume and catalyst
  • Systems and methods for activating and drying silica fume and catalyst
  • Systems and methods for activating and drying silica fume and catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0106] The silicon powder and the powdered nickel catalyst are added into the mixer according to the ratio of 50:1 to 200:1, and the silicon powder and nickel catalyst mixture are obtained by mixing. The silicon powder nickel catalyst mixture obtained above is fed into the activation drying space of the activation dryer through the raw material feeding port which is connected with the mixer and arranged on the body of the activation dryer. Use the electric heating component of the reducing gas supply device to preheat the hydrogen in it to 150 degrees Celsius, and then feed it into the activated dryer through the reducing gas inlet connected to the reducing gas supply device and arranged on the main body of the activated dryer in the activated dry space. Utilize the resistance heating rod casing that is provided with in the activation drier to provide heat to the silicon powder catalyst mixture in the activation drying space, the temperature of the activation drying space is c...

Embodiment 2

[0108]The silicon powder and the powdered nickel catalyst are added into the mixer according to the ratio of 50:1 to 200:1, and the silicon powder and nickel catalyst mixture are obtained by mixing. The silicon powder nickel catalyst mixture obtained above is fed into the activation drying space of the activation dryer through the raw material feeding port which is connected with the mixer and arranged on the body of the activation dryer. Use the electric heating component of the reducing gas supply device to preheat the hydrogen in it to 450 degrees Celsius, and then feed it into the activated dryer through the reducing gas inlet connected to the reducing gas supply device and arranged on the activated dryer body in the activated dry space. Utilize the resistance heating rod casing that is provided with in the activation drier to provide heat to the silicon powder catalyst mixture in the activation drying space, the temperature of the activation drying space is controlled at ...

Embodiment 3

[0110] The silicon powder and the powdered nickel catalyst are added into the mixer according to the ratio of 50:1 to 200:1, and the silicon powder and nickel catalyst mixture are obtained by mixing. The silicon powder nickel catalyst mixture obtained above is fed into the activation drying space of the activation dryer through the raw material feeding port which is connected with the mixer and arranged on the body of the activation dryer. Use the electric heating component of the reducing gas supply device to preheat the hydrogen in it to 150 degrees Celsius, and then feed it into the activated dryer through the reducing gas inlet connected to the reducing gas supply device and arranged on the main body of the activated dryer in the activated dry space. Utilize the resistance heating rod casing that is provided with in the activation drier to provide heat to the silicon powder catalyst mixture in the activation drying space, the temperature of the activation drying space is c...

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 provides a system and a method for activating and drying silicon powder and catalytic agents. The system comprises a mixer, an activating and drying device connected with the mixer, and a reducing gas supply device connected with the activating and drying device. The system is simple in structure, easy to operate and control, and safe and stable in operation. Moreover, gas is distributed uniformly, the heat transfer effect is good, the activating and drying time is short, the efficiency is high, the reaction temperature and the pressure of the system are low, equipment is convenient to maintain, the reducing gas can be recycled, heat can be recovered, and the energy consumption is low.

Description

technical field [0001] The invention relates to the field of polysilicon production, in particular to a system and method for activating and drying silicon powder and catalyst. Background technique [0002] A large amount of silicon tetrachloride, a by-product produced in the polysilicon production process, will seriously pollute the environment if discharged directly. The existing treatment method is to convert silicon tetrachloride into trichlorosilane through cold hydrogenation. This method is to mix the powder catalyst and silicon powder uniformly in a certain proportion, and then continuously convert them from 20 degrees Celsius to 420 degrees Celsius under a reducing gas atmosphere. Activation treatment under changing temperature conditions; a certain proportion of reducing gas and silicon tetrachloride mixed gas passes through the activated catalyst and silicon powder material layer to realize the cold hydrogenation reaction of silicon tetrachloride. Silicon powder a...

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 Patents(China)
IPC IPC(8): C01B33/037C01B33/107C30B29/06C30B35/00
Inventor 张升学严大洲肖荣晖汤传斌杨永亮万烨
Owner CHINA ENFI ENGINEERING CORPORATION