Emulsion Liquid Membrane and APT Production Advantages

Dissolve crude sodium tungstate that obtained after alkali fusion with tungsten fine mud in water as feed solution and adjusted pH to 8-9, after removing impurities of silicon, without removal of phosphorus, arsenic, molybdenum at room temperature for a directly laboratory intermittent film migration, according to the best operating conditions of the orthogonal design, obtain ammonium paratungstate (APT) crystallization directly in inside aqueous phase within 5min . Extraction rate is 99.85%, and the purity level of product is the firsts standards. This article had depth study on various factors, and proposed A-class continuous countercurrent flow with low cost, which is a new approach with great promise.

Advantages of the  first level film production process are: it does not need to adjust the solution to acidic after removing Si, crystalline can be directly produced in  inside aqueous phase by A-class liquid membrane process, acid saving, the process is short, fast, without evaporation and crystallization, energy saving and finer grain, without removing P, As, Mo. Solution containing tungsten material has up to 45g / L when the first extraction. The oil phase and the inner aqueous phase repeatedly reuse, less reagent consumption. According to the economic accounting of film production of mixed rare earth to calculate the operating costs be low, operating costs of liquid membrane method are generally about 1/3 than extraction method, the actual accounts of that is to be tested.