A kind of regeneration method of metal filter tube

A technology of metal filtration and filter tubes, applied in the direction of filter regeneration, filtration separation, separation methods, etc., can solve problems such as no reusable value, achieve the effect of reusing and restoring air permeability

Active Publication Date: 2017-05-10
NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Currently only a batch of freshly prepared metal filter tubes can be replaced
The replaced metal filter tubes can only be used as waste products and have no reusable value.

Method used

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  • A kind of regeneration method of metal filter tube
  • A kind of regeneration method of metal filter tube
  • A kind of regeneration method of metal filter tube

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] The metal filter tube of the present embodiment regeneration process is the stainless steel filter tube used in the purification process of the polysilicon process produced by the Siemens method, and the regeneration method of the metal filter tube of the present embodiment comprises the following steps:

[0024] Step 1. Wipe the outer surface of the metal filter tube until the solid intercepted matter accumulated on the outer surface of the metal filter tube is removed;

[0025] Step 2, place the metal filter tube wiped in step 1 in hydrofluoric acid for acid leaching treatment; the temperature of the acid leaching treatment is 30°C, the time of the acid leaching treatment is 6h, and the hydrofluoric acid The consumption is 10 times of metal filter tube quality, and the mass percentage concentration of described hydrofluoric acid is 10%;

[0026] Step 3. Under the condition that one end of the metal filter tube after the acid leaching treatment in step 2 is closed, fil...

Embodiment 2

[0034] The metal filter tube of the present embodiment regeneration process is the stainless steel filter tube used in the purification process of the polysilicon process produced by the Siemens method, and the regeneration method of the metal filter tube of the present embodiment comprises the following steps:

[0035] Step 1. Wipe the outer surface of the metal filter tube until the solid intercepted matter accumulated on the outer surface of the metal filter tube is removed;

[0036] Step 2, place the metal filter tube wiped in step 1 in hydrofluoric acid for acid leaching treatment; the temperature of the acid leaching treatment is 40°C, the time of the acid leaching treatment is 4h, and the hydrofluoric acid The consumption is 12 times of metal filter tube quality, and the mass percentage concentration of described hydrofluoric acid is 15%;

[0037] Step 3. Under the condition that one end of the metal filter tube after acid leaching treatment in step 2 is closed, fill th...

Embodiment 3

[0044]The metal filter tube of the present embodiment regeneration process is the stainless steel filter tube used in the purification process of the polysilicon process produced by the Siemens method, and the regeneration method of the metal filter tube of the present embodiment comprises the following steps:

[0045] Step 1. Wipe the outer surface of the metal filter tube until the solid intercepted matter accumulated on the outer surface of the metal filter tube is removed;

[0046] Step 2. Put the metal filter tube wiped in step 1 into hydrofluoric acid for acid leaching treatment; the temperature of the acid leaching treatment is 50°C, the time of the acid leaching treatment is 0.5h, and the hydrofluoric acid The consumption of acid is 20 times of the metal filter tube quality, and the mass percentage concentration of described hydrofluoric acid is 1%;

[0047] Step 3. Under the condition that one end of the metal filter tube after the acid leaching treatment in step 2 is...

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Abstract

The invention provides a regeneration method of a metal filter pipe. The regeneration method comprises the following steps: (1) the outer surface of the metal filter pipe is wiped until solid residues accumulated on the outer surface of the metal filter pipe are totally removed; (2) the metal filter pipe is put in hydrofluoric acid for acid leaching; (3) multiple times of back flushing are performed; and (4) the sintering is performed to obtain the regenerated metal filter pipe. The regeneration method combines the wet acid leaching, the back flushing and the high-temperature reduction sintering to strengthen the descaling efficiency of the metal filter pipe, and realizes the high-efficiency regeneration of the metal filter pipe. The metal filter pipe regenerated by the method can realize the industrialized recycling to prominently reduce the production cost, and is wide in promotion and application values.

Description

technical field [0001] The invention belongs to the technical field of metal element recycling, and in particular relates to a regeneration method of a metal filter tube. Background technique [0002] The existing purification system used in the purification process of producing polysilicon by the Siemens method mainly includes a filtration system, a backflushing system and a slag discharge system. Traditional filter systems are mainly based on mechanical dust removal and ceramic filter materials. It has been found through practice that the gas-solid separation effect of mechanical dust removal is not good, especially it is difficult to separate fine solid particles from gas. Although ceramic filter materials have the advantages of high temperature resistance and corrosion resistance, the biggest disadvantages of ceramic filter materials are poor thermal shock resistance, fragility, and fast attenuation of filtration capacity. In recent years, due to good temperature resis...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23G1/02B01D41/04
Inventor 李烨汤慧萍汪强兵王建杨坤杨保军
Owner NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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