Please advise whether the salt purification process below is feasible

Water distribution tank------Salt dissolving tank-------Front reaction tank-------Middle reaction tank--------Filter press-----Filter press-------Back reaction tank--------Kai membrane-------Brine tank Changed to: Clarification tank (with BaCl2 added)——Water distribution tank ------Salt dissolving tank-------Front reaction tank-------Pre-treatment unit (with FeCL3 added)——Middle reaction tank Last edited by yzhms on 2009-3-19 11:58]

Water distribution tank------Salt dissolving tank-------Front reaction tank-------Middle reaction tank--------Filter press-----Filter press-------Back reaction tank--------Kai membrane-------Brine tank. The poster wants to use multiple filter presses to replace the pre-treatment unit; does he think the two can be considered equivalent? In my opinion, this is very detrimental to the operation of the Kai membrane. The function of the preprocessor is to use flocculants to enclose small sediment particles, causing them to aggregate into larger particles that can then settle automatically. If the process described above is used, the residence time is relatively short; conventional filtration methods can only remove large particles of salt sludge, and thus do not achieve an effective filtering effect. In this way, most of the small particles end up in the KAI membrane, which poses a significant strain on its capacity. Furthermore, if saltwater must be filtered, switching between filter presses is also a rather cumbersome task; the workload associated with the saltwater processing step is significant as well, and this affects the smooth operation of that process. This post was last edited by yzhms on 2009-3-19 11:59]

Sodium carbonate should be added before filtration to effectively settle impurities; adding it after filtration will be ineffective!

Problems existing: 1. Treating magnesium hydroxide and barium sulfate directly by filtration pressuring makes it difficult to remove the sludge, and the filtration pressure rises too rapidly； 2. When filtering saline water, crystals such as calcium carbonate are still used to form a filter cake ； 3. If it is a dual-system setup, consideration can be given to treating brackish water to recover barium sulfate.

What the original poster means is that by going straight to the pressure filter, the sludge removal processes in the clarification tank and pre-treater can be avoided, right? What a large area of filter press would be needed to operate continuously in this way, and once the filter cloth is damaged, the mixture becomes cloudy easily, which directly affects the operation of the brine purification equipment. The idea is very creative!

It’s a good idea, but the sediment passing through the filter is too fine, making it difficult to achieve stable operation

This process can be used, but its stability is not high. If the saltwater contains high levels of magnesium, more Mg(OH)2 is produced, which makes the filtration process difficult; the filter cloth has poor permeability and needs to be washed frequently, as well as the filter press itself: loveliness:

This process is not feasible. The precipitation of Mg(OH)2 requires a flocculant; moreover, the pores in the filter fabric of the roller are relatively large, allowing Mg(OH)2 to pass through easily in the absence of flocculation.

This process is merely a theoretical treatment method; reusing the filtration device does not necessarily yield good results. For any given equipment or process, it is first necessary to determine what the purpose is Only then can it be used. In my opinion, a pre-treater is necessary before using the Kay membrane, but it isn’t necessarily this specific combination; the actual goal is to control various cationic parameters before the membrane is used.

Thank you all for your guidance; I have learned a great deal from it. At HaiChuan, I feel like I’m at home, which is wonderful. Thank you again:loveliness: :loveliness: :loveliness: :loveliness:

The filtration pressure of the press is very high, placing a significant strain on it

I support the person from the second floor; I think this manufacturing method is quite good!

No, the vulnerabilities are too severe; it’s better to use the molding process.