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

A technology of hydrogen cyanide and electromotive power, which is applied in the field of electromotive transfer and recovery of hydrogen cyanide to prepare silver cyanide, which can solve the problems of large chemical consumption and secondary pollution

Active Publication Date: 2013-01-30
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

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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 preparing silver cyanide (AgCN) by recovering hydrogen cyanide (HCN) through electrodynamic migration. The device consists of an electric waste gas treatment device, a cathode electro-Fenton device and an HCN gas absorption device, wherein the electric waste gas treatment device consists of an anode chamber and a cathode chamber; the anode chamber and a cathode chamber is partitioned by an ion permselective membrane; voltages are respectively applied to both ends of the device; a waste gas is converted into a CN<-> form after entering the cathode chamber, and transmits an ion exchange membrane under the action of electromigration to enter the anode chamber; a high-concentration HCN gas is obtained in the anode chamber; the high-concentration HCN gas is collected in an HCN recovery storage tank; absorption liquid in an absorption liquid tank contains Ag<+>; and the Ag<+> reacts with HCN in an absorption tower. The device disclosed by the invention can be used for recovering HCN in various cyanogen-contained waste gases, such as a carbon fiber tail gas, an allyl cyanide gas, a calcium carbide furnace gas, a coke-oven gas, a yellow phosphorus tail gas and the like, and the HCN can be produced into an AgCN product.

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 Applications(China)
IPC IPC(8): B01D53/74B01D53/78B01D53/54C01C3/08
Inventor 吴祖成廖文
Owner ZHEJIANG UNIV
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