Technology for preparing high-purity anhydrous lithium chloride through centrifugal extraction of salt lake brine

Abstract

The invention discloses a technology for preparing high-purity anhydrous lithium chloride through centrifugal extraction of salt lake brine. The technology solves the technical problem that in the prior art, the preparing purity is poor and comprises the steps of impurity removal, hydrochloric acid blending, multistage counterflow centrifugal extraction, multistage counterflow washing, multistage counterflow reverse extraction, saponification, iron removal, oil removal, final evaporation and concentration, crystallization, separation, drying, packaging and obtaining 99.995% high-purity sewage lithium chloride products. Compared with the prior art, the technology has the beneficial effects that before lithium extraction, the saponification working procedure is set, an extraction organic phase containing amide complexing extractants is regenerated, and a frequency converter closed-loop flow control system is introduced for precisely controlling the flow; the backflow of the stage is adopted for solving the problem that the contact face is small due to large-phase-ratio feeding; a centrifugal extraction machine is arranged, the technology is automatically switched, and continuity and reliability of production can be ensured.

Description

technical field [0001] The invention relates to the field of comprehensive utilization of salt lake resources, in particular to a process for preparing high-purity anhydrous lithium chloride by centrifugal extraction of salt lake brine. Background technique [0002] Lithium has been hailed as "the energy metal that drives the world's progress". Because of its unique physical and chemical properties, it is a strategic resource of great significance in national economy and national defense construction. In nature, lithium resources mainly occur in solid ore and liquid brine. Lithium salt production in my country has always been dominated by lithium-containing ores such as spodumene and lepidolite. With the increasing depletion of solid lithium ore resources, lithium extraction from salt lake brine has attracted more and more attention from relevant departments. Due to the abundant lithium resources in salt lake brine, salt lake brine has gradually become the most important ...

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Problems solved by technology

However, the traditional solvent extraction method generally uses a box-type mixing and clarifying extraction tank extraction method, which has the following disadvantages: 1. The extraction process requires a large amount of organic phase, and the volume of the organic phase that needs to be filled in the extraction tank is large, and the area occupied by the extraction tank is large. 2. The extraction efficiency is low, the total flux of the extraction tank is small, and the processing capacity of the feed liquid is small; 3. The number of stages required is large, and it is difficult to obtain high-purity products; 4. It takes a long time to re-establish phase equilibrium; 5. Extraction The organic phase in the process raffinate is entrained more

The above reasons have hindered the popularization and application of solvent extraction in the process of extracting lithium, and also hindered the industrial production of high-purity lithium chloride

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