隔膜电解法再生废铬酸液的改进研究

以阳离子交换膜为隔膜,电解处理塑料粗化过程中产生的废铬酸液。大大优于陶瓷隔膜电解法。离子交换膜法的条件:在温度40～50℃,槽电压2.5～3.0 V的条件下,控制〔Cr^(3+)〕下限值10g/L。电解过程的电流密度为3.5～4.0A/dm^2,电流效率可达72%～80%,电耗仅为150～170 kW·h/m^3。

废铬酸的回收利用

前言我厂是生产各种规格自行车车圈的专业厂,现有环型、直型、手工三条电镀线,镀层结构是氰化镀铜—光亮镍—装饰铬组合体系,自从1982年开机电镀到1987年止,由于镀铬清洗水没能及时处理,造成了大量积压,估计总共有四十多吨废铬液,据了解,浙江省的其它几家主要自行车和零件厂,象杭州、绍兴自行车总厂,兰溪自行车零件厂等都存有许多废铬液,废铬液的贮存,占据了大量的槽位,

废铬酸(Cr^(6+))处理高浓度乳化液的研究

文章介绍了一种废乳化液和废铬酸的混合处理方法,主要利用废乳化液的还原性和废铬酸的氧化性使废乳化液和废铬酸之间相互反应,从而实现废乳化液的破乳及氧化降解和废铬酸的还原去除。此方法无需添加破乳剂、氧化剂及还原剂,运行成本低廉且处理效果好,是一种以废治废的新方法,具有较好的发展前景。

Chromate and the Environment： Removal and Utilization of Industrial Waste

Chromate and dichromate sodium as a function of oxidizer characteristics are used in several industrial areas; for example, in surface protection of coated parts of cadmium, zinc and aluminum （chromate coated treated）, corrosion inhibitors, the treatment of leather, the manufacture of pigments, etc. However, the use of such products has been questioned due to the problems of toxicity and pollution that can be caused in the environmental. The Brazilian environmental agency has established that the concentrations of chromate in water courses are less than 0.5 ppm. In order to reuse chromate （CrO42） from industrial effluent, laboratory experiments have been proposed based on chemical reduction or electrolytic processes, in order to transform these chromate ions in a final mix of oxides （in solid form）, which can then be packed and sent to the production process of sodium chromate. The results of these experiments have become useful industrially （without regard to costs） considering the environmental reuse and the life cycle of the chemical compound.