1, Yichun beneficiation plant
Located in Jiangxi, tantalum and niobium is a lithium, rubidium sorting concentrator more noble metals minerals, lepidolite concentration plant is a part of the plant. The plant treated ore containing about 20% lithium mica, other useful mineral-rich iron ore manganese tantalum niobium, tantalum, tin ore, microlite, the main gangue minerals albite, topaz, quartz, and a small amount of other minerals. The design scale of Yichun Concentrator is 1,500 tons/day. After the ore is crushed and ground, it is re-elected to produce coarse concentrate, which is selected for commercial concentrate. The re-selected tailings are fed into the lithium mica workshop. The production process of the lithium mica is particularly simple. The mixed amine is directly added to the tailings slurry to directly float the lithium mica. The foam product is the lithium mica concentrate. The lithium mica concentrate produced by the plant has a grade of 4% to 4.7% Li2O, and the recovery rate is about 80% to 85%. At the same time, lanthanum and cerium are recovered from the lithium mica concentrate. The production process is shown in Figure 1. The workshop is currently being expanded and remodeled.
Figure 1 Yichun lithium mica workshop flotation process
2. Germany a processing plant 40 years Germany has used magnetic separation and flotation concentrate from the production of iron lepidolite in a tungsten and tin. The mine only recovered tungsten and tin minerals in the 1920s, while iron-lithium mica was abandoned as tailings. Due to the market demand, the iron-lithium mica concentrate was recovered from the accumulated tailings by magnetic separation method, and then the iron-lithium mica beneficiation workshop was built. In 1945, the plant with a scale of 600 tons/day was built, respectively, using magnetic separation and magnetic separation. The iron-lithium mica concentrate is produced by combining two processes of flotation, and the concentrate grade is 95%-97% iron-lithium mica, and the recovery rate is 50%-70%. There are two types of ore processed, as shown in Table 1, and the production process is shown in Figures 1 and 2.
Table 1 Mineral composition of two ores
| Quartz type | Mineral name | quartz | Lithium mica | fluorite | topaz | 锡石 | Black tungsten ore | |
| content,% | 78 | 20 | 1.3 | 0.5 | 0.1 | 0.1 | ||
| Yunying rock type | Mineral name | Yunyingyan, granite feldspar, porphyry | quartz | Iron lithium mica | Black tungsten ore | 锡石 | other | |
| content,% | 45 | 43 | 6 | 1 | 1 | 4 | ||
FIG 2 zinnwaldite old plant flowsheet
FIG 3 new plant zinnwaldite sorting process
3. What are the mica dressing agents that are sorted according to the difference in surface physicochemical properties of mica and gangue. The ore is broken and ground to dissociate the mica monomer. Under the action of the agent, the mica becomes a foam product and is separated from the gangue. Mica flotation can be carried out in an acidic or alkaline slurry, and the long carbon chain amide cations and fatty acid anions are mica collectors .
The main agents are sulfuric acid, sodium hydroxide, water glass, dodecylamine, oxidized soap and the like. In the mica flotation process, three rough selections and three selections are required to obtain the mica concentrate. Therefore, mica ore float is used to recover mica and fine-grain mica below 14 mesh in pegmatite and mica schist. In China, mica ore flotation has been widely used in production.
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