In tungsten smelting process, the tungsten ore alkali is decomposed to sodium tungstate. In low and middle grade tungsten raw material alkali leaching liquid, a substantial amount of free alkali often contained. To meet the requirements of the subsequent production process of solution PH value and the need of saving resources and protecting the environment, it’s necessary to separate and recycle alkali from the sodium tungstate. So in industry, inorganic acid neutralization or crystallization processing are often used to eliminate the free alkali from sodium tungstate solution. But these two kinds of methods are full of large consumption, it is necessary to seek new alkali tungsten separation method to reduce consumption and the production cost of tungsten smelting process. Next，let me introduce some new methods of eliminating free alkali from sodium tungstate.

First of all, let's take a look at how to make use of membrane electrolysis to remove the free alkali in sodium tungstate. Experiment using constant current electrolysis method in a row, electrolyte circulation by gas lift, anode high trough the material liquid and the cathode of high pure water through after the flow meter into their respective electrolyte circulation in the primary loop, with circulation of electrolyte electrolysis blend into the cell; To record slot voltage sampling and analysis on a regular basis in the process of Yang, cathode overflow liquid of alkali concentration, according to the changes of the concentration of alkali to adjust the feeding and add water to maintain the stability in anode and the cathode overflow of alkali concentration in the liquid. Using continuous operation mode is advantageous to the sodium tungstate solution membrane stability of free alkali process.

According to the experiment, in 50 to 55 ℃, under the condition of current density of 1000 a/m2. The single slot long-term stable operation, removing anode in the raw material for sodium tungstate solution 80% of free alkali, electrical efficiency of more than 88%, energy consumption is lower than 1900 Kwh/tNaOH. Three cell series operation, within 60-65 ℃, power flow density under the condition of 1000 a/m2, electric effect also on 88% to below 2250 Kwh/tNaOH energy consumption. It’s full of industrial practical value. Therefore, cation exchange membrane electric free alkali process is economically feasible. It’s stable and reliable on craft and has a good prospect of industrial application.

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