Refining system and refining process of brine for production of salt from sea water

Abstract

The invention discloses a refining system and a refining process of brine for production of salt from sea water. The refining system includes a multi media filtration system, a multi media filtration cleaning system, an ultrafiltration system, an ultrafiltration backwash system and an ultrafiltration chemical cleaning system; the multi media filtration system includes a multi media filtration system water inletting tank and a multi media filter, the multi media filtration cleaning system includes a multi media filtration cleaning system fresh water box, a multi media filtration system upper-row electric valve, a multi media filtration system lower-row electric valve and a multi media filtration cleaning system cleaning pump; the ultrafiltration system includes an ultrafiltration system water inletting tank and an ultrafiltration membrane component, the ultrafiltration backwash system includes an ultrafiltration system air compressor and an ultrafiltration system water producing tank, and the ultrafiltration chemical cleaning system includes an ultrafiltration cleaning system fresh water box, an ultrafiltration cleaning system citric acid storage box and an ultrafiltration cleaning system hydrochloric acid storage tank. The refining process relates to a physical filtering technology without addition of medicament, and may not cause the hidden danger of product edible salt.

Description

technical field [0001] The invention relates to the technical field of water treatment, and more specifically relates to a brine refining system and refining process for producing salt from seawater. Background technique [0002] At present, the preparation of edible salt and industrial salt in our country mostly adopts the vacuum salt method, which can be divided into reprocessed salt, well mine salt, and sun-dried saturated brine salt according to the different salt-making raw materials. For the seawater salt production industry, compared with re-salt production (the original salt is redissolved into saturated brine to produce salt), using beach-dried saturated brine to produce salt does not require desalination of the original salt, and the consumption of fresh water is low, which simplifies the salt production process and reduces the cost of salt production. Land use, while greatly reducing production costs, has been adopted by many sea salt manufacturers. However, the ...

AI Technical Summary

Problems solved by technology

However, in the original technology, the precipitation method cannot remove colloids, and the filtration accuracy of sand filtration is low, and the removal efficiency of colloidal pollutants at the level of tens to thousands of nanometers is extremely low

Therefore, the high-concentration brine treated by the original technology still contains a large amount of colloidal pollutants and metal ion pollutants such as iron and manganese carried by it. Using this raw material brine for vacuum salt production will cause the product salt to carry a large amount of organic colloids Pollutants and some iron and manganese ions, after the product salt is re-dissolved with fresh water or pure water, the pollutants are precipitated, reacting to form flocs and making the saturated brine show a clear color, which affects the use

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