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Device for preparing silver cyanide (AgCN) by recovering hydrogen cyanide (HCN) through electrodynamic migration and method for device

A hydrogen cyanide and electrodynamic technology, which is applied in the field of devices for preparing silver cyanide by electrodynamic migration and recovery of hydrogen cyanide, can solve the problems of secondary pollution, consumption of large chemicals, etc.

Active Publication Date: 2014-09-24
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Patent CN 201586472 U discloses a cyanide-containing waste gas treatment device. The cyanide-containing waste gas is fully absorbed after being mixed with caustic soda solution twice. Compared with the operation in the prior art, the absorption rate is greatly increased and the caustic soda consumption is reduced. , which improves the level of safe production, but this technology also faces the consumption of a large amount of chemical agents, and produces secondary pollution, and cannot recycle HCN

Method used

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  • Device for preparing silver cyanide (AgCN) by recovering hydrogen cyanide (HCN) through electrodynamic migration and method for device
  • Device for preparing silver cyanide (AgCN) by recovering hydrogen cyanide (HCN) through electrodynamic migration and method for device
  • Device for preparing silver cyanide (AgCN) by recovering hydrogen cyanide (HCN) through electrodynamic migration and method for device

Examples

Experimental program
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Effect test

Embodiment 1

[0025] use as figure 1 A device for recovering hydrogen cyanide to prepare silver cyanide by electromotive migration is shown to recover HCN in carbon fiber cyanide-containing waste gas and synthesize AgCN. The concentration of HCN in the exhaust gas is 30mg / m 3 , the flow rate is 100m 3 / h, the residence time is 10min, after the device of reclaiming hydrogen cyanide to prepare silver cyanide through electrokinetic migration, the AgCN product with a purity of 98%-99.5% is obtained in the product tank, and it is discharged after being treated by the cathode electro-Fenton device The content of HCN in the gas is less than 0.05mg / Nm 3 , far lower than the maximum allowable concentration of HCN national standard of 0.3mg / Nm 3 . Among them, the size of the electric exhaust gas treatment device is 3m*4m*10m, the anode is a titanium ruthenium-plated mesh electrode, the cathode is a stainless steel mesh electrode, and the inert filler is an active ceramic ball.

Embodiment 2

[0027] In Example 2, two sets of electric waste gas treatment devices were used in series to recover HCN in calcium carbide furnace gas and synthesize AgCN. The operating steps and AgCN recovery principle are the same as those in Example 1. The concentration of HCN in the exhaust gas is 2.45g / m 3 , the flow rate is 1000m 3 / h, the furnace gas enters the two-stage electric waste gas treatment device in two ways, and the residence time is 20min. The AgCN product is obtained in the product tank, and the content of HCN in the discharged gas after being treated by the cathode electric Fenton device is lower than 0.25mg / Nm 3 , lower than the maximum allowable concentration of HCN national standard is 0.3mg / Nm 3 . Among them, the size of each stage of electric exhaust gas treatment device is 5m*4m*10m, the anode is titanium ruthenium plated mesh electrode, the cathode is stainless steel mesh electrode, and the inert filler is active ceramic ball.

Embodiment 3

[0029] In Example 3, two sets of electric waste gas treatment devices are used to recover HCN in the calcium carbide furnace gas in series, and the concentration of HCN in the waste gas is 2.45g / m 3 , enters the two-stage electric waste gas treatment device in two ways, and after passing through the device for electrodynamic migration recovery and purification of cyanide-containing waste gas, HCN pure gas and AgNO 3 The absorbing liquid is reversely contacted, and after electromotive force migration recovers hydrogen cyanide to prepare silver cyanide, the AgCN product with a purity of 97%-98.5% can be obtained in the product tank, and the AgCN at this time is 70.9%-80.5% suspended liquid.

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Abstract

The invention discloses a device for recovering hydrogen cyanide and preparing silver cyanide by electrodynamic migration. The device consists of an electric exhaust gas treatment device, a cathode electro-Fenton device, and an HCN gas absorption device. The electric exhaust gas treatment device is composed of an anode chamber and a cathode chamber, which are separated by an ion-selective permeable membrane, and a voltage is applied to both ends of the device. , the exhaust gas enters the cathode chamber and is converted into CN- form, and enters the anode chamber through the ion exchange membrane under the action of electromigration, and obtains high-concentration HCN gas in the anode chamber, which is collected by the HCN recovery storage tank, and the absorption liquid in the absorption liquid tank contains Ag+, react with HCN in the absorption tower to prepare the product AgCN. The device can recover HCN from various cyanide-containing waste gases (such as carbon fiber tail gas, acrylcyanide waste gas, calcium carbide furnace gas, coke oven gas, yellow phosphorus tail gas, etc.) and produce AgCN products.

Description

technical field [0001] The invention relates to a device and a method for preparing silver cyanide by recovering hydrogen cyanide by electromotive force migration. Background technique [0002] The removal methods of HCN are mainly absorption method, adsorption method and combustion method. Several methods for removing HCN waste gas have their own characteristics, and the advantages and disadvantages of each treatment method and the objects they are suitable for are different. When dealing with HCN tail gas produced in actual production, factors such as HCN concentration, other components contained in tail gas and emission methods, existing equipment and cost of treatment methods will all affect the choice of HCN removal method. When using the adsorption method, some gas components will affect the adsorption of activated carbon to HCN. For example, when the exhaust gas contains a lot of water vapor, there is a competitive adsorption phenomenon between water vapor and HCN, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/74B01D53/78B01D53/54C01C3/08
Inventor 吴祖成廖文
Owner ZHEJIANG UNIV
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