Method for extracting rubidium, cesium and lithium from sodium chloride slag

Abstract

The invention discloses a method for extracting rubidium, cesium and lithium from sodium chloride slag. The method for extracting rubidium, cesium and lithium from sodium chloride slag comprises the following steps that (1) the sodium chloride slag is dissolved in water to form a solution, hydrochloric acid is added to adjust the pH of the solution to range from 2 to 3, the solution is heated and concentrated, when the concentration liquid level is 1 / 4-1 / 3, filter pressing is carried out on concentration liquid, and filtrate is extracted; (2) sodium hydroxide is added into the filtrate in the step (1), a rubidium-cesium solution with the alkalinity of 0.5-1 mol / L is prepared, and continuous stirring is carried out for 20-40 min by using a stirrer; and (3) the solution treated in the step (2) is added into an extracting agent consisting of t-BAMBP, diethylbenzene and sulfonated kerosene, and stirring is carried out until rubidium and cesium in the solution are not detected. According to the method for extracting rubidium, cesium and lithium from the sodium chloride slag, the problem of enrichment of low-concentration rubidium, cesium and lithium is solved, the problem of recovery of rubidium, cesium and lithium from solid slag is solved, the recovery cost is low, and the production period is short.

Description

technical field [0001] The invention relates to the technical field of element separation, in particular to a method for extracting rubidium, cesium and lithium from sodium chloride slag. Background technique [0002] Rubidium and cesium are rare alkali metals with good photoelectric properties and chemical activity, and are widely used in national defense, medicine, new energy, aerospace and other fields. As rare metal elements, rubidium and cesium are widely distributed and occur in lepidolite, cesium garnet, potassium feldspar, salt lake brine, and geothermal water. [0003] At present, the basic raw materials for industrial production of rubidium and cesium are mainly solid ores such as cesium garnet and lepidolite. After extraction, the production efficiency of low-concentration rubidium and cesium is low. In order to improve production efficiency, after evaporation and concentration, a part of rubidium and cesium It is basically enriched in the solid slag. Therefore...

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Problems solved by technology

[0003] At present, the basic raw materials for industrial production of rubidium and cesium are mainly solid ores such as cesium garnet and lepidolite. After extraction, the production efficiency of low-concentration rubidium and cesium is low. In order to improve production efficiency, after evaporation and concentration, a part of rubidium and cesium It is basically enriched in the solid slag. Therefore, the extraction of rare metal elements such as rubidium and cesium from rubidium, cesium and sodium chloride slag is of great significance for the sustainable development of rubidium and cesium extraction and recovery.

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