Ion-Exchange Method Determines Tungsten Trioxide Content

It is often difficult to achieve mutual separation because tungsten and molybdenum ionic radius close to the atomic structure of tungsten and molybdenum, and they are similar to chemical properties in minerals. There area many methods of separation: precipitation, extraction, ion exchange method and so on. These methods of separation are to smelt molybdenum tungsten and molybdenum. Among them, the precipitation method is the use of the separation of tungsten and molybdenum tungsten acid, its solubility in water and hydrochloric acid is far less thanthat in molybdic acid. Molybdic acid increases as the temperature rises, the solubility of this nature can not be completely removed.

Ion-exchange method is a method of separation in the use of ion exchanging in the exchangeable groups in the solution of different ion-exchange capacity of ions. Two common methods are water softening and deionization method. Water softening is a lowering water hardness pre-treatment program, which is mainly used before reversing osmosis (RO) process.Tenderizer is way that a sodium ion exchanges two calcium ions or magnesium ions to soften water in spherical resin. The key of ion-exchange method is to choose the suitable ion exchangers, adsorption and elution conditions.

Experimental Procedure
1. Weighing 60g of citric acid dissolved in water and diluting to 100ml;
2. Weighing 0.3g of copper sulfate dissolved in water and diluting to 100ml;
3. Weighing 200g of citric acid, placing in 1000ml beaker, adding 400ml water until completely dissolving and adding 330ml of sulfuric acid 0.20g copper sulfate, diluting with water to 1000ml, mixing;
4. Weighing 0.1500g after 550 ℃ calcination of molybdenum trioxide, placing in 250ml beaker, adding an appropriate amount of sodium hydroxide solution, heating and dissolving completely, after cooling, and transferring to 1000ml volumetric flask with sodium hydroxide solution and mixing.

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