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采矿和冶金业日益感到处理其工业废水的必要。当废水中含有重金属和氰化物一类的有害物质时，一般需要物理化学和化学方法处理。本文讨论以沉淀－浮选的方式作为处理含重金属（主要是锌和镉）及氰化物的废水的物理化学方法。文中给出了用于实际废水的试验室例子。在两种情况下沉淀浮选都可将废水中有毒化合物浓度大幅度降低，得到一种可以排放或循环再用的固体废渣。一种阳离子铺收剂—盐酸十二烷胺—证明是所研究的两体系中最好的表面活性剂。选择硫化钠和双硫脘作为含锌废水的沉淀剂，而优先选用铜盐以一种适用于用AVR（酸化－挥发－再生）法循环再用的形式沉淀氰化物。
The mining and metallurgical industries are increasingly feeling the need to dispose of their industrial effluents. When wastewater contains harmful substances such as heavy metals and cyanides, it is generally required to deal with them physically and chemically. This paper discusses the physico-chemical approach of precipitation-flotation as a treatment of wastewater containing heavy metals (mainly zinc and cadmium) and cyanide. An example of a laboratory for actual wastewater is given. In both cases, sedimentation flotation can significantly reduce the concentration of toxic compounds in the wastewater, resulting in a solid waste that can be discharged or recycled. A cationic surfactant, dodecylamine hydrochloride, proved to be the best of the two systems studied. Sodium sulphide and dithiocarb are selected as precipitating agents for zinc-containing wastewater, and the copper salts are preferably precipitated in a form suitable for recycling by AVR (acidification-volatilization-regeneration).