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在冷拔钢管中,为了提高钢管质量,顶头的表面要进行严格的镀铬处理。镀铬液用铬酐(cro_3)配制,不可避免要产生一种以铬酸形式存在的六价铬。六价铬是一种强腐蚀剂和强氧化剂,对人体有严重危害,特别是电镀时温度升高,大量铬酸分子随电解所产生的氧气和氢气溢出液面而进入大气,加之从镀槽中取镀件时带出的铬酸滴在地上或进入清洗槽,其后便随着清洗镀件和冲洗地面的冲洗水而进入下水道,致使环境受到污染。过去,我厂分厂采用槽边抽风将氢气、氧气和铬酸酸雾从风道排出。但因大部分铬
In the cold drawn steel, in order to improve the quality of steel, the head surface to be strictly chrome plating. Chromium plating solution with chromic anhydride (cro_3) preparation, it is inevitable to produce a chromic acid form of hexavalent chromium. Hexavalent chromium is a strong corrosive and strong oxidant, on the human body has a serious harm, especially when plating temperature, a large number of chromic acid molecules with the electrolysis of oxygen and hydrogen spill into the atmosphere, and from the plating tank Chromic acid dripping out of the plating takes place on the floor or into the cleaning tank, and then enters the sewer as washing plating and flushing water flushing the ground, causing the environment to be contaminated. In the past, I plant the factory side slot exhaust hydrogen, oxygen and chromate acid mist discharge from the air duct. But because most of the chromium