Issues with the purification of phosphate saline
Thread Content
Does anyone have any tips? The project I’m working on currently involves the purification of phosphate-containing brine. The purification process is similar to that used in the chlor-alkali industry, and it consists of primary and secondary purification steps. In the primary purification stage, the calcium and magnesium concentrations in the brine are 3 mg/L and 4 mg/L respectively. In the secondary step, adsorption is carried out using a chelating resin in a single tower; the resin used is Lanxiao LSC-100, with a resin packing height of 1.7 m, a tower diameter of 0.5 m, and a resin packing volume of 0.4 m3. The flow rate of the brine entering the tower during the primary stage is 1.0 m3/h. The total calcium and magnesium concentrations in the brine after secondary purification are between 200–300 μg/L, while the levels of other metal ions remain within normal ranges. I wonder whether the chelating resin has different adsorption effects on metal ions present in chlorides and phosphates What is the principle?
It is likely that sodium chloride being a strong electrolyte, while hydrogen phosphate is a weak electrolyte, results in poor adsorption performance by the secondary chelation resin. I’m not sure if that’s correct? :L