Where do the aluminum and silicon in saltwater come from? How to remove it?

It is mainly brought in by water and salt; when brine is used, it is also due to water or substances introduced during the purification of the brine. Additionally, poor control of excess alkalinity in the system leads to an increase in its amount.

This post was last edited by pzhhuagong on 2009-11-6 at 16:04. Aluminum ions (Al3+) are mainly introduced by industrial salts. Impact: If it is not combined with other ions, no precipitate is formed, but it can pass through the membrane into caustic soda, affecting product quality. Silicon, SiO2, is mainly introduced by industrial salts and pollution from salt processing. Impact: Silicates aggregate within the membrane as the pH value increases, thereby entering the cathode circulation fluid. Mainly, in the one-time salt removal process, the pretreatment separation effect is not satisfactory, as is the membrane filtration effect.

The aluminum content in the brine is slightly high; saltwater tanks are usually made of reinforced concrete, and it is necessary to provide corrosion protection to prevent silicon present in the cement from entering the brine

SiO2 is mainly introduced through the open-air stacking of salts, or by the use of open containers and pollution during the salt processing process. Effect on the ion exchange membrane: It causes a decrease in current efficiency; aluminum ions (Al3+) can deposit together with silicates and sodium. Sources of aluminum ions: 1. Soil present in salts; 2. Vacuum-treated salts. Effect on the ion exchange membrane: It causes a decrease in current efficiency; aluminum ions can deposit together with silicates and sodium. Aluminum is acidified in the anode solution, turning into ions that enter the ion exchange membrane in the form of cations. However, as the pH value increases, they transform into soluble anions that deposit in the ion exchange membrane in the form of anions; the mechanism is similar to that of silicon. If brackish water is recycled, there is generally no accumulation of these two types of ions. The metal ion concentrations in the purified water can be monitored and analyzed, and under normal conditions, these concentrations can be reduced to the required levels using chelating resins

Thank you for the analysis from above; I also suspect that it was brought in by contamination during the salt processing. But even after treatment with a resin tower, the levels are still above the limit. What should I do?

6# *ou*ngzhe amphiphilic resin cannot remove trivalent aluminum ions; it can only remove divalent metal ions. Aluminum ions can only be removed by controlling the excess alkalinity in a single saltwater treatment.

I asked for an analysis of a sample of industrial water; the values are as follows: Al: 0.438 ppm, SiO2: 6.55 ppm, Ba: 0.089 ppm, Ca: 40 ppm, Fe: 0.057 ppm, Mg: 6.86 ppm, Mn: 0.027 ppm, Ni: 0.017 ppm, Sr: 0.319 ppm. As can be seen from these figures, the levels of these two ions in the industrial water exceed the allowed limits, and it is difficult to remove them – so isn’t it very hard to meet the required standards? May I ask those who produce ion-exchange membrane caustic using industrial salt, what type of hydrated salt do they use?

It seems that industrial water must definitely not be used to dissolve salt. Otherwise, the consequences will be really serious.

What region is this industrial water from? Are the calcium and magnesium levels this high?

This post was last edited by yzhms on 2009-12-8 at 15:24. 8# *ou*ngzhe: Is a sand filter used in the treatment of raw water? Additionally, in the filtration process for mineral water, aluminum trichloride is added as a coagulant to improve the water’s light transmittance and to deal with suspended particles; there is no effective solution for this issue, so it is recommended to change the source of the water.