The use of technical salt (mineral halite) in the regeneration technology of modern automatic Na-softening filters


The consumption of salt for the regeneration of Na-softening filters is one of the most expensive items in the operation of water treatment equipment.

Modern water softening systems are fully automated. The operator only needs to add salt to the feeder (salt solvent tank) after it has been consumed. 

Modern valves automatic control of flows in the softening systems are complex technical devices with lots of transitions, openings, orifices, injectors, plungers, etcThe use of solutions from crude technical salt (halite) in such devices can lead to clogging of the device and its failure. 

Manufacturers of flow control valves recommend using tableted salt for resin regeneration. Tableted salt is a salt that has been pre-cleaned of various contaminants. The solution obtained from such a salt is transparent and an insoluble precipitate is not formed at the bottom of the feeder. The content of NaCl in the tableted salt should be at least 99.0%. For regeneration of resin of softening systems the amount of the sodium chloride in the salt should be at least 97%. 

The main disadvantage of the tableted salt is its cost. Currently, the wholesale purchases of 1 kg of the tableted salt costs from 0,25 $. As a cheaper analogue, a mineral concentrate halite (technical salt) of the highest category, which contains 97-98% NaCl can be considered.

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