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

A technology of concentrated seawater and liquid salt, applied to potash fertilizers, alkali metal chlorides, inorganic fertilizers, etc., can solve the problems of expensive extraction materials, complicated operating procedures, and large material turnover, and achieve improved comprehensive utilization and energy consumption. Low, reduce the effect of potassium extraction cost

Inactive Publication Date: 2013-03-20
TIANJIN SEA WATER DESALINATION & COMPLEX UTILIZATION INST STATE OCEANOGRAPHI
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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.

Method used

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

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[0017] The technical scheme of the present invention will be further described in conjunction with the following examples:

[0018] Take 4 glass exchange columns, the size is 15mm×1400mm, each exchange column contains Na + Type natural clinoptilolite 150g, 4 ion-exchange columns with natural clinoptilolite are connected in series. Get 8L of concentrated seawater after extracting bromine, magnesium and calcium as the raw material solution, and the potassium ion K in the raw material solution + The concentration is 2.69g / L, SO 4 2- The concentration is 4.88g / L, Ca 2+ The concentration is 0.60g / L.

[0019] The raw material liquid passes through the ion exchange column in series from bottom to top, the flow rate is 16mL / min, the potassium ion K in the raw material liquid + Adsorbed onto the zeolite in the ion exchange column, Na + Type zeolites become K + type zeolite. Collect the exchange liquid flowing out from the ion exchange column, and take samples every 15 minutes...

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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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Application Information

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IPC IPC(8): C05D1/00C01D3/06
Inventor 蔡荣华高春娟张家凯王俐聪曹冬梅王玉琪
Owner TIANJIN SEA WATER DESALINATION & COMPLEX UTILIZATION INST STATE OCEANOGRAPHI
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