1. Status of occurrence
150 has now found in nature more lithium and lithium-containing mineral ore, in which 30 kinds of mineral independently lithium silicate majority (67%) and phosphate (21.2%), other minerals is very less. Preparation of lithium mineral raw materials are mainly spodumene (containing from 58% to 8.1%) industrially, lepidolite (containing 3.2% ~ 6.45%), lithium phosphate boehmite (containing 7.1% - 10.1%), petalite (including 2.9% to 4.8%) and iron lithium mica (including 1.1% to 5%), especially the former three minerals are the most important.
2. Lithium ore's main industrial type of lithium resources mainly occurs in the salt lake and granitic pegmatite deposits, of which salt lake lithium resources account for 69% of global lithium reserves and 87% of global lithium reserves. The main types of industry are:
(1) granite pegmatite: Xinjiang Keketuohai Nb - Ta deposit lithium beryllium, beryllium Sichuan Jiajika lithium ore. The content of the cut-off grade is 0.4-0.6%, the lowest industrial grade is 0.8-1.1%, and the associated mineral is >0.2%.
(2) Alkaline granite type: Jiangxi Yichun 414 钽 (铌) - lithium deposits. The content of the cut-off grade is 0.5-0.7%, the lowest industrial grade is 0.9-1.2%, and the associated mineral is >0.3%.
(3) Salt Lake (Brine) Type: Yiliping Lithium Deposit in the central part of Qaidam Basin in Qinghai. The content of LiCl is 1000 mg/L; the associated mineral is >200-300 mg/L.
Spodumene beneficiation technology
3. Mineral processing method
The beneficiation method of solid lithium ore includes hand selection method, flotation method, chemical or chemical-flotation combined method, thermal cracking method, radioactive selection method, and granular flotation method. The first three methods are more commonly used.
(1) Hand selection method In the 1950s and 1960s, it was one of the main methods of mineral processing in the production of lithium concentrate and beryl concentrate at home and abroad. For example, in 1959, Xinjiang, Hunan and other provinces hand-selected the production of beryl concentrates of more than 2,800 tons. In 1962, the world beryl concentrate production was 7,400 tons, of which hand-selected concentrates accounted for 91%. This is mainly due to the fact that most of the lithium mines come from the pegmatite deposits, and the major industrial minerals such as spodumene and beryl are selected and the crystals are easy to choose. However, it should be noted that the manual labor intensity is high, the production efficiency is low, the resources are wasted, and the selection index is low, so it is gradually replaced by mechanical beneficiation methods. However, in developing countries where labor is cheap, hand selection is still the main method of producing lithium concentrate.
(2) Flotation method The research and application of the flotation method was earlier. In the 1930s, the flotation method was applied to the industrial production of spodumene concentrate. Some of the spodumene flotation use reverse flotation, and some use positive flotation; lithium mica is easy to float, and is commonly used for flotation. In China, the flotation research of spodumene and beryl was started in the late 1950s, followed by lithium mica flotation, lithium strontium separation and other lithium antimony ore, and the flotation of spodumene, beryl and lithium mica was developed. The process is applied and applied in the lithium niobium beneficiation process of the new plant. Spodumene beneficiation technology
(3) The chemical or chemical-flotation combination method is applicable to the salt lake lithium mine, and the lithium salt is extracted therefrom by this method. The method is to evaporate on the drying field by brine, so that the sodium salt and the potassium salt are precipitated, the lithium chloride concentration is increased to about 6%, and then sent to the factory to convert lithium chloride into lithium carbonate solid by soda method. product. There are three types of brine-type lithium resources: carbonate type, sulfate type and chloride type. At present, carbonate type and sulfate type are mainly developed. The technology developed is also complex and is still in production trials.
Rice Cake Mould,Gold Ingot Shaped Cake Mould,Tortoise Cake Mould,Boat Cake Mould
OSFE INDUSTRIAL CO.,LTD , https://www.1758cookware.com