Preparation method of powder type high-capacity titanium-based lithium ion exchanger

Abstract

The invention provides a preparation method of a powder type high-capacity titanium-based lithium ion exchanger, wherein the titanium source is metatitanic acid on a sulfuric acid process production line, and the precursor can be prepared at low lithium source consumption and short calcination time. The lithium ion elution process of a precursor comprises stirring and adding acid to remove lithiumin a tank, that concentration of slurry H+ in the tank is controlled to prevent the dissolution of titanium, the dissolved lithium is concentrated in a solution, the solid and liquid are separated toobtain a lithium solution with high concentration and low acidity, the concentration energy consumption is reduced and alkali for neutralizing waste acid is reduced, thereby greatly reducing production cost.

Description

technical field [0001] The invention belongs to the field of preparation of inorganic non-metallic materials, in particular to a preparation method of a titanium series lithium ion exchanger. Background technique [0002] Lithium and its compounds are important strategic materials for national economy and national defense construction, and are widely used in many fields such as glass, ceramics, aviation, nuclear energy and new energy. According to the annual report published by the United States Geological Survey (USGS) in January 2016, the world's proven reserves of onshore lithium resources in terms of metal lithium are about 14 million tons, of which reserves in salt lake brine Accounting for 70% to 80%; and the amount stored in seawater is about 260 billion tons. Therefore, in order to meet the needs of sustainable development, scholars from various countries are actively looking for new technologies for extracting lithium from salt lake brine and (concentrated) seawate...

AI Technical Summary

Problems solved by technology

The first two methods have problems such as complex process, expensive raw materials, and difficult process control, which are not conducive to industrialization

High-temperature solid-phase method, the synthesis method is simple, and it is easy to achieve mass production. Usually, the titanium source is mixed with anatase or rutile titanium dioxide and lithium source, and then calcined at high temperature. However, due to the diffusion rate of lithium source in TiO2 crystal, it takes a long time. Sintering, resulting in an excess of more than 20% of the expensive lithium source to make up for the loss of lithium during the sintering process, there are problems of high lithium source consumption and easy sintering of particles

The precursor lithium ion elution process is often eluted with flowing acid. In order to reduce the dissolution loss of titanium, the acid concentration is usually less than 0.2mol / L, resulting in too low concentration of the dissolved lithium solution, which requires high energy consumption for concentration, and contains A large amount of acid, neutralization requires a large amount of base and introduces too many cationic impurities, increasing the cost of lithium source recovery

The above problems lead to the difficulty in quality control of titanium-based lithium ion exchangers, difficulty in mass production and high cost, making it difficult to popularize and apply

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