Method for extracting potassium co-production liquid salt from concentrated seawater

Abstract

The invention discloses a method for extracting a potassium co-production liquid salt from concentrated seawater, and the method comprises the following steps of: taking natural clinoptilolite as an ion exchanger, and absorbing potassium in concentrated seawater of which the elements, namely bromine, magnesium, calcium and the like, are extracted, wherein the flow speed that the seawater passes into the natural clinoptilolite is 15-20mL / min, and the low-potassium exchange fluid in the obtained exchange fluid is a liquid salt product; taking saturated ammonium chloride solvating as a desorption solution, flowing into potassium-absorbed zeolite at the flow speed of 10-15mL / min, eluting to obtain a potassium-enriched eluant, and evaporating and concentrating the potassium-enriched eluant to obtain an ammonium chloride potassium product; and eluting potassium ion-absorbed zeolite, regenerating by liquid salt, and recycling. According to the method, the seawater of which the elements, namely bromine, magnesium, calcium and the like, are extracted is taken as a raw material liquid, so that the high-quality ammonium chloride potash fertilizer with large market demand can be obtained, the comprehensive utilization rate of the concentrated seawater can be improved, and the low-potassium production cost can be reduced.

Description

technical field [0001] The invention relates to seawater comprehensive utilization technology, in particular to a method for extracting potassium from concentrated seawater and co-producing liquid salt. Background technique [0002] There are abundant potassium resources in seawater, and it is estimated that the total reserves reach 500 trillion tons. However, the grade of potassium resources in natural seawater is extremely low, and the average content of potassium ions in seawater is only 0.38g / L. At present, the methods for extracting potassium from seawater mainly include chemical precipitation, organic solvent extraction and membrane exchange. The chemical precipitation method uses the solubility characteristics of potassium salts to precipitate potassium salts from seawater with chemical substances, and then chemically treats the precipitates to obtain soluble potassium salts. The organic solvent extraction method is to extract the potassium salt in seawater by using...

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Problems solved by technology

In the adsorption process of the above method, there are also common problems such as large material turnover, expensive extraction materials, complicated operating procedures, large energy consumption, and high extraction costs.

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