2results about How to "Reduce impurity concentration" patented technology

The utility model relates to the technical field of environment-friendly treatment of industrial sewage, in particular to a yellow phosphorus production sewage circulating purification system, which is provided with a yellow phosphorus sewage tank, a multi-stage sedimentation mechanism, a concentration filtering mechanism and a clear liquid collecting tank which are sequentially arranged along a sewage treatment flow, the yellow phosphorus sewage tank is used for collecting yellow phosphorus production sewage; the multi-stage sedimentation mechanism is provided with a plurality of deep cone sedimentation machines which are arranged in series and are used for carrying out sedimentation separation on the conveyed yellow phosphorus sewage; the concentrating and filtering mechanism is used for concentrating and separating the conveyed settling floating liquid; and the clear liquid collecting tank is used for collecting the clear liquid separated by the concentrating and filtering mechanism and conveying the clear liquid to the phosphorus collecting tower through a water conveying pipe. Aiming at the special characteristics of yellow phosphorus production sewage purification treatment, the utility model constructs a closed circulation purification system, has the technical characteristics of greatly reducing the occupied area, being low in construction and operation cost and excellent in separation and purification effect, and has remarkable technical effect and economic benefit.

The invention belongs to the technical field of cobalt hydrometallurgy, and particularly relates to a method for preparing high-purity cobalt from crude cobalt hydroxide, which comprises the following steps of: performing size mixing on the crude cobalt hydroxide, and performing selective reduction leaching through concentrated sulfuric acid and sulfur dioxide to obtain cobalt leachate and manganese slag; sodium bicarbonate is adopted to adjust the pH of the cobalt leaching solution for segmented precipitation and filtration, and after impurities are removed, a nickel-containing cobalt sulfate solution is obtained; the solution is introduced into nickel removal resin subjected to qualified cobalt sulfate pre-saturation treatment for adsorption and elution separation, cobalt-containing effluent is combined, and high-purity cobalt sulfate is obtained; and finally, carrying out electrodeposition by taking the cobalt plate as an electrolyte solution to obtain the high-purity cobalt plate. According to the method, the processes of selective reduction leaching, sodium bicarbonate segmented precipitation, cobalt pre-saturation, resin adsorption nickel removal and cobalt electrodeposition are adopted, the method has the advantages of being short in technological process, easy to operate and low in cost, the prepared cobalt plate product is high in purity, and nickel sulfate is recycled.