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.
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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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