Macroporous resin has discontinuous and discrete hole. It does not show the swelling in aqueous solution and is not transparent or milky when wet. Macroporous resin synthetic process: firstly add aromatic hydrocarbon, fatty hydrocarbon, alcohol and other organic solvents known as the pore. When resin polymerization, remove the solvent. Many big holes in the resin are formed. Macroporous resin plays the role of adsorption and filtering in water treatment, and can remove organic material, humus acid, lignin sulfonic acid. It can also remove iron, color, and protect ion exchange resin from pollution to prolong the service life of the exchange resin.

In the traditional tungsten smelting of ion exchange process, there’s a series of problems because of the large water consumption. How to improve the tungsten trioxide concentration of exchange liquid is a very important problem. Compared with the traditional gel type resin, adsorption effect of macroporous resin on high concentration sodium tungstate solution is best and beneficial to reduce the dilution water, improve the equipment capacity and reduce wastewater emissions.

 

Reaction with different types of resin and a certain amount of sodium tungstate solution under different conditions, through timing sampling analysis we can get the following results: 

1. Under weak alkali conditions, different macroporous weakly alkali resin has good adsorption effect on high concentration sodium tungstate solution. The D301 resin adsorption speed is faster than the others. And it is relatively optimal in mechanical strength, wear resistance, resistance to swell-shrink. 

2. D301 resin adsorption capacity decreases with the increase of particle size, but the trend is moderate. This illustrate that its chemical structure has no significant impact on the polymerization ion diffusion rate. 

3. With the reduction of pH, D301 resin adsorption capacity firstly increases and then reduces. In the range of pH value 4 ~ 6, D301 resin shows higher adsorption capacity. 

4. When the concentration of tungsten trioxide in range of 150 g/L and 455 g/L, the resin adsorption capacity can reach 850 mg/g dry resin. But because of high concentration, solution stability is poorer. Therefore, tungsten trioxide concentration control is advisably less than 350 g/L.

5. The D301 resin adsorbing polymerization ion process is less affected by temperature. The resin will be greatly influenced by the high temperature of solution. Therefore, it is most favorable to conduct high concentration of ion exchange under the environment temperature less than 30℃. .

6. The influence of stir speed on D301 resin adsorption capacity is not obvious. The influence of the high intensity mixing effect on the ion exchange process of the high concentration sodium tungstate solution is not big.