What are the common hydrochloric acid lithium extraction processes for spodumene?

15311826613

Welcome to consult Xinhai - customized mineral processing plan

Xinhai can provide you with mineral processing tests, mineral processing process and mineral processing equipment selection, mineral processing plant scheme design and construction drawing design; provide mining mineral processing equipment; provide mineral processing plant construction and equipment installation as well as mine management and operation services.

Consultation 153-1182-6613

15311826613

Click to add WeChat

Get product price

WeChat ID has been copied, add friends, and get manufacturer quotations!

Spodumene beneficiation for lithium extraction is an important resource for obtaining lithium. Due to the complex nature of spodumene ore and the different ore formation conditions, The mineral processing methods are also different. Among them, the salt method is more common for extracting lithium. The main reason is that after high-temperature calcination, the lepidolite structure becomes loose and an ion exchange reaction occurs. According to the different processing methods, it can be divided into sulfate roasting method, chlorine Chemical roasting method, sulfide roasting method, etc.

1. Lepidolite sulfate roasting lithium selection method

Yes The cations in the sulfate are exchanged with lithium ions, the lithium ions are replaced, and a lithium sulfate solution is obtained by leaching. The sulfate method has low impurity content, high leaching rate, good comprehensive metal recovery effect, and simple process. It has been widely used in the industrial production of lithium extraction from lepidolite. However, the sulfate method also needs to be completed after high-temperature roasting. During the high-temperature roasting process, fluorine and sulfide-containing waste gas will volatilize, causing serious environmental pollution. Minerals tend to stick together during the roasting process, reducing the roasting efficiency and lithium. Products are susceptible to potassium contamination.

2. Lithium selection method by chlorination roasting of lepidolite

The lithium and other valuable metals in lepidolite are converted into soluble chlorides, and the lithium-containing solution is obtained after leaching. Realize the extraction of lithium and alkali metals. The chloride roasting method can effectively shorten the time, produce a small amount of silicon-aluminum slag, and is easy to use. However, chloride gasification will cause pollution to the environment. The use of chlorine gas has higher operational risks and requires higher anti-corrosion requirements for equipment, resulting in production Increased costs.

3. Lithium selection method by roasting lepidolite sulfide

Use sulfides (such as Na2S and FeS) to be effectively roasted or ground and then leached with water to extract lithium. The iron sulfide reagent used in this process is cheap, has low baking temperature, is environmentally friendly, has low impurity content, and has a relatively high leaching rate. However, the grinding time in the experiment is long, and sulfur-containing compounds may volatilize into the atmosphere and cause air pollution.

The above three are all lithium extraction processes by salt method. In actual production, the recovery of lithium needs to consider many factors. For the production of mineral processing plants, it is very important to understand the composition and properties of minerals. On this basis, the method used as a process is relatively scientific and reasonable, and can effectively reduce investment losses.