3 results about "Colloidal iron" patented technology

The application discloses a kind of multistage filtration systems for ultrapure water production process, multistage filtration system includes primary filter device and secondary filter device, RO concentrated water stock solution is sequentially transported to primary filter device, secondary filter device;The inside of primary filter device is equipped with colloidal silica filter material, the inside of secondary filter device is equipped with colloidal iron filter material;Colloidal silica filter material is amino functionalized MOFs nanofiber composite membrane, colloidal iron filter material is nanofiber membrane with surface grafted hydroxamic acid group.The multistage filtration system for ultrapure water production process provided by the application has excellent colloidal silica removal effect and excellent colloidal iron removal effect.

A method of treating contaminated water that has ferrous ions and at least one additional mineral in solution includes the steps of: adding a sufficient quantity of a caustic agent to the contaminated water to achieve a basic pH, and adding oxygen to the contaminated water to achieve a molar ratio of oxygen to ferrous iron of at least 1:10. The pH and the oxygen concentration are sufficient to produce ferrous hydroxide (Fe(OH)2) from ferrous ions and ferric hydroxide (Fe(OH)3) from the ferrous hydroxide while limiting colloidal iron formation, at least the ferric hydroxide forming a precipitate. The precipitate is separated from the contaminated water.

The application discloses a method for deeply removing fluorine in zinc sulfate solution, which comprises the following specific steps: (1) adding aluminum sulfate into the pre-neutralized zinc sulfate solution to perform pre-defluorination, and then performing liquid-solid separation to obtain defluorinated solution; (2) sequentially adding calcine and slaked lime into the defluorinated solution, and then performing liquid-solid separation. The method does not change the main process route, only adds aluminum sulfate particles into the pre-neutralized solution, and outputs defluorination slag by pressure filtration to open a channel, and the fluorine in the solution is removed by the aid of 10% iron ions in the process, the process adjustment does not need additional investment, and the original matching equipment and facilities can completely realize the removal of fluorine in the solution, the economic cost of the method is less than that of defluorination by a defluorination agent, the defluorination rate is high, the pre-removal of aluminum sulfate reaches 60%, the deep removal of fluorine by colloidal iron is realized, and the total fluorine removal rate reaches more than 90%.