Method for producing low-sodium salt from potassium-rich brine

Abstract

The invention discloses a method for producing low-sodium salt from potassium-rich brine, which comprises the following steps: sequentially carrying out purification and impurity removal, primary evaporation and concentration and solid-liquid separation to obtain sodium chloride and low-sodium salt raw material brine, carrying out secondary evaporation and concentration on the low-sodium salt raw material brine, and carrying out solid-liquid separation to obtain sodium chloride and high-temperature feed liquid; and carrying out gradient step-by-step cooling crystallization on the high-temperature feed liquid to obtain a low-sodium salt product. According to the method, high-content sodium chloride in the raw material mother liquor can be concentrated and separated out through two evaporation and concentration processes, a mechanical mixing mode is not adopted, but a physical evaporation crystallization mode is adopted, a natural low-sodium salt product can be directly obtained, uniform distribution of granularity is realized, a potassium-sodium layering phenomenon occurring in the transfer, storage and use processes is avoided, and the taste and the condition are better.

Description

technical field [0001] The invention belongs to the technical field of salt production, and in particular relates to a method for producing low-sodium salt from potassium-rich brine. Background technique [0002] Low-sodium salt is a healthy edible salt. The main component of commonly used table salt is sodium chloride, and 10-35% potassium chloride is used instead of sodium chloride in low-sodium salt. Replacing common table salt with low-sodium salt can effectively lower blood pressure and prevent about 743,000 cases of non-fatal cardiovascular disease each year. At present, most of the low-sodium salts produced in China are based on iodized table salt, and 10-35% of the total amount of edible potassium chloride is added, and after being mixed evenly, they are used as low-sodium salt products. However, most of the low-sodium salt products in the market are mechanically mixed with ordinary table salt and edible potassium chloride to obtain low-sodium salt products. Since t...

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Problems solved by technology

[0003] The technical problem to be solved by the present invention is that the existing low-sodium salt products are prepared by mechanical mixing, and the particle size of potassium chloride particles and sodium chloride particles is not uniform, the mixing is not uniform, and sodium and potassium are easily separated.

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