Device and method for carrying out electro-Fenton oxidization on HCN (hydrogen cyanide) by using liquid-phase method
A Fenton oxidation and liquid phase technology, applied in chemical instruments and methods, separation methods, separation of dispersed particles, etc., can solve problems such as secondary pollution, low-concentration HCN solution cannot be treated, and consume large amounts of chemical agents
Active Publication Date: 2014-09-10
ZHEJIANG UNIV
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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. , improve the level of safe production, but also face the consumption of a large amount of chemical agents, and produce secondary pollution, and the ions cannot be recycled
Moreover, the remaining low-concentration HCN solution is not treated
Method used
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Embodiment 1
[0024] use as figure 1 A liquid-phase electro-Fenton oxidation device for HCN is shown to treat HCN in carbon fiber cyanide-containing waste gas. The concentration of HCN in the exhaust gas is 90mg / m 3 , after the device for recovery and purification of cyanide-containing waste gas through electromotive migration, CN - Oxidized to (NH 4 ) 2 CO 3 Recovery can obtain the product of 96.6%-98.7% through recrystallization.
Embodiment 2
[0026] In Example 2, two sets of electric waste gas treatment devices are used in series to recover HCN in the calcium carbide furnace gas, and the operation steps and principles are the same as those in Example 1. The concentration of HCN in the exhaust gas is 2.45g / m 3 , after the electromotive migration recovery and purification of cyanide-containing waste gas device, CN - Oxidation to (NH 4 ) 2 CO 3 Recovery can obtain 97%-98.5% product after recrystallization.
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The invention discloses a device and a method for electro-fenton oxidation of HCN by liquid phase method. It includes electric exhaust gas treatment device, HCN recovery storage tank, gas demister, spray storage tank, online monitor, anolyte collection tank, catholyte tank, solution tank containing Fe2+, cathode electro-Fenton device, (NH4) 2CO3 recovery storage tanks, other waste gas treatment devices, neutralization tanks, etc.; high-concentration cyanide-containing waste gas first passes through an electric waste gas treatment device to recover most of the HCN, and the remaining low-concentration HCN gas is passed into the cathode electro-Fenton device, and the cathode electro-Fenton device It is a fluidized bed type filled with a conductive medium. Apply voltage to both ends of the device, feed a solution containing Fe2+, and feed air into the cathode. Under the action of electricity, free radicals are generated to oxidize low-concentration HCN into NH3 and CO2. , to achieve zero HCN emissions and recovery of (NH4)2CO3. The device can treat low-concentration HCN in cyanide-containing waste gases such as calcium carbide furnace gas and coke oven gas.
Description
technical field [0001] The invention relates to a device and a method for electro-fenton oxidation of HCN by liquid phase method. 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, which makes the adsorbed HCN desor...
Claims
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IPC IPC(8): B01D53/78B01D53/54
Inventor 吴祖成张群芳廖文
Owner ZHEJIANG UNIV