Method for extracting rubidium chloride from kaolin tailings

Abstract

The invention discloses a method for extracting rubidium chloride from kaolin tailings. Firstly, the kaolin tailings are subjected to millstone mill crushing and sieving to obtain kaolin fine mineralpowder, the kaolin fine mineral powder and a leaching agent are mixed evenly, the evenly-mixed powder is poured into an acid solution which is heated in advance, acid leaching is conducted, and an acid leaching liquid is obtained; the pH of the obtained leaching liquid is adjusted to approach neutral, calcium is removed, and leaching liquid containing rubidium is obtained; and the processes that 4-tert-butyl-2-(alpha-xylyl) which is diluted by adding sulfonated kerosene is adopted for extraction, a hydrochloric acid solution is adopted for reverse extraction and the like are adopted to obtaina rough rubidium salt product, and the rough rubidium salt product is dissolved and recrystallized to obtain a rubidium salt product with high purity. The rubidium salt extraction process free of chloridizing roasting has the advantages of being simple and feasible in process procedure, low in cost, environmentally friendly, free of pollution and suitable for industrialization.

Description

technical field [0001] The invention belongs to the field of mineral purification, in particular to a method for extracting rubidium chloride from kaolin tailings. Background technique [0002] Due to its unique properties, rubidium has a wide range of uses and plays an important role in the national economy. It plays an important role in both traditional fields and new application fields, especially in high-tech fields. found out. In the traditional fields, such as catalysts, special glass, electronic devices, biological materials and other fields, there has been great development in recent years. In new fields, such as rubidium atomic clock, magnetic fluid power generation, energy and other fields, it has shown strong vitality. At present, in developed countries, the proportion of rubidium used in high-tech fields reaches 80%, and that of rubidium used in traditional fields accounts for 20%. Rubidium is an important raw material for the manufacture of electronic devices...

AI Technical Summary

Problems solved by technology

Salt lake brines and underground brines in Qinghai, Tibet Plateau and other places are also rich in rubidium. However, because the chemical properties of rubidium are similar to those of other coexisting metal ions, industrial separation is difficult and the full utilization of rubidium resources is limited. Rubidium low yield

[0004] At present, there are many domestic enterprises producing rubidium chloride and other rubidium salts, and the output is not large. The main preparation method is to extract from the by-products in the lithium salt smelting process and kaolin tailings. The extraction method is mostly mixed with chloride salts. After granulation, roasting is carried out, and the roasted minerals are crushed and then leached with water, followed by decalcification, extraction, back extraction and other processes to prepare rubidium salt products. This method has long process flow, high cost, and large energy loss in the sintering process. Chlorine gas that pollutes the air is also produced during the roasting process

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