Method for short-process extraction of rubidium chloride from rubidium-containing high-salt brine

Abstract

The invention relates to the technical field of rubidium separation and purification, and particularly discloses a method for short-process extraction of rubidium chloride from rubidium-containing high-salt brine. The method comprises the following steps: firstly, adding inorganic alkali into rubidium-containing high-salt brine in stages, precipitating metal ion impurities such as copper, lead, zinc and magnesium, and adjusting the pH value of the high-salt brine to 13-14; and then, carrying out extraction washing reverse osmosis reverse extraction treatment on the high-salt brine by using 4-tert-butyl-2-(alpha-methyl benzyl) phenol as an extracting agent and sulfonated kerosene as a diluent to obtain a reverse extraction solution containing rubidium chloride, and sequentially carrying outprecipitation, calcination and recrystallization treatment on the reverse extraction solution to obtain a high-purity rubidium chloride product. According to the method disclosed by the invention, the rubidium is separated and purified from the high-salt brine by utilizing a short extraction process, so that the extraction process is shortened, partial circulation of washing water is realized, the yield of raffinate is reduced, and the subsequent treatment cost of the salt brine is reduced on the premise of ensuring the separation effect and the recovery rate of the rubidium.

Description

technical field

[0001] The invention relates to the technical field of rubidium separation and purification, in particular to a short-flow method for extracting rubidium chloride from rubidium-containing high-salt brine. Background technique

[0002] Rubidium is a rare alkali metal element, which has a wide range of applications in optical glass, thermoelectric generators, atomic clocks, solar cells, and medicine. However, rubidium does not have a pure natural mineral, and is often dispersed in mica, cesium garnet, and halides containing cesium, lithium, and potassium, and can only be extracted as a by-product, resulting in its scarcity.

[0003] The separation and purification of rubidium is a challenging task, because the associated alkali metal elements have very similar physical and chemical properties. Common separation methods include precipitation, ion exchange, adsorption and extraction. The precipitation method is the earliest rubidium separation method, but it ha...

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