China Nonferrous Metallurgy

Yanggu Xiangguang Copper Industry Co., Ltd. uses vulcanization precipitating arsenic-gypsum neutralization process to treat acid sewage water from flue gas sulphuric acid production.During the treatment process, gases such as hydrogen sulfide and carbon dioxide are generated, which need to be absorbed by the treatment system to ensure zero emission of fugitive gases.The hydrogen sulfide in the first stage of the detoxification tower in the vulcanization precipitating arsenic process cannot be completely absorbed. It can be completely absorbed by connecting the outlet pipe of the first stage of the detoxification tower to the fan inlet of the second stage of the detoxification tower, and the absorption liquid can be recycled as the hydrogen sulfide reaction liquid.The unorganized gas generated in the gypsum neutralization process includes hydrogen sulfide and carbon dioxide. After two lye spray washing system transformations, the unorganized gas in the gypsum production can be effectively controlled. The reaction tank is improved by improving the gas extraction and negative pressure effects of the reaction tank.Measures such as the location of the liquid inlet pipe and the addition of a self-circulating diaphragm pump at the bottom of the reaction tank slowed down the reaction siltation tank and blockage, so that the gypsum fan’s air extraction pipeline was unblocked and the air extraction effect was ensured.