Study on the Degradation of Sodium Diethyldithiocarbamate (DDTC) in Artificially Prepared Beneficiation Wastewater with Sodium Hypochlorite

Abstract

e degradation of DDTC in beneficiation wastewater has become an increasingly concerned issue due to the serious effects on the environment. In this study, the degradation characteristics of DDTC in artificially prepared beneficiation wastewater were investigated by adding sodium hypochlorite as an oxidant, and the influences of different degradation conditions on removal efficiency of DDTC were analyzed systematically. e results indicated that the degradation rate of DDTC without sodium hypochlorite added can reach 88.4% in a stewing time of 6 h. When the dosage of sodium hypochlorite was 400 mg·L −1 , the degradation rate of DDTC can reach 91.28% for 1 min reaction time under the natural condition of pH value 5.98 and reaction temperature 25°C. e DDTC in the wastewater was firstly degraded into carbon disulfide and diethylamine, and then carbon disulfide was further degraded into CO 2 , S, or SO 4 2− , while diethylamine was degraded into N 2 and CO 2 . e research results can provide a technical basis for the treatment of beneficiation wastewater containing DDTC.

Multiphase Flow Characteristics in the Classification Process of a Novel Wide Neck Thickener: Experiment and Simulation

“…Thickeners are important units for water recovery in which particles settle under gravity to achieve solid–liquid separation. − This process has been widely used in many industries, such as wastewater treatment, metallurgy plants, and mineral processing. − Fine minerals have low settling rates, and, in order to effect faster settling, a flocculant is often added to the feed slurry and mixed to bind dispersed fine particles into larger aggregates, − this produces a clear liquor overflow and a concentrated underflow suspension of solids . These suspended solids are discharged from the bottom while the clarified liquid is collected at the peripheral overflow for reuse or further purification. , However, thickeners cannot cope with the increasing number of fine minerals in the feed ore, and researchers have studied the influence of various parameters on thickener performance.…”