Method for extracting boron by solvent extraction-ion exchange adsorption combination

Abstract

The invention relates to a method for extracting boron with the combination of solvent extraction-ion exchange adsorption. According to the method, boric acid of relatively low content is extracted from old brine of a magnesium-containing salt lake after acidification boron precipitation; the energy consumption can be effectively reduced as an extraction procedure with relatively small grade numbers is adopted, and the use amount of an extraction agent is reduced; after extraction, an ion exchange adsorption procedure is performed, and the trace boron element is removed by using an ion exchange adsorption method with high selectivity, so that the boron extraction grade number is effectively reduced, and the energy consumption is reduced; as a novel mixed extracting agent system is adopted, the single-grade extraction rate is high, and the solution loss is small. The method can be implemented under the condition of low energy consumption, the boron of low content in old brine after acidification boron precipitation of the salt lake can be effectively extracted, the extract is a pure boron-containing solution, a high-quality boron product can be prepared, the boron resource can be sufficiently utilized, the quality of a later magnesium salt product is greatly improved, comprehensive development and utilization of the old brine after acidification boron precipitation of the salt lake are achieved, and the economic benefits are remarkably increased.

Description

technical field [0001] The invention relates to a new process technology for the development and comprehensive utilization of salt lake brine resources, belongs to the technical field of inorganic salt chemical industry, and specifically relates to a method for extracting boron by combining solvent extraction and ion exchange adsorption. Background technique [0002] Boron and boron compounds are widely used in agriculture, metallurgy, national defense, machinery and medicine, and with the rapid development of my country's industry, the demand is increasing day by day. At present, my country's solid boron ore resources have been nearly exhausted after years of development, and boron-rich salt lake brine resources have outstanding advantages, which have not yet been effectively utilized and developed. Therefore, the separation and extraction of boron from brine will be the main way to obtain boron and boron compounds in the future. [0003] In the comprehensive development a...

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Problems solved by technology

For example, although the acidification crystallization method has simple equipment and a short production cycle, it is mainly suitable for the extraction of high-content boron elements, and boron elements are difficult to obtain a more thorough extraction and separation; Adsorption occurs, and follow-up separation is still required; if the solvent extraction method is used, the number of extraction and stripping stages required to obtain a high boric acid recovery rate is large, the energy consumption is high, and the water consumption is large; although the ion exchange method has adsorption selectivity Higher, but due to the limitation of its ion exchange adsorption capacity, it is not suitable for the extraction of higher content boron-containing brine

However, among the various extraction boron extraction processes reported, there is no technology that can be used for the deep boron extraction of old brine in salt lakes with high efficiency, energy saving, economy and practicality. It is necessary to further develop an effective new process for deep boron extraction of old brine in salt lakes.

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