After using the high-pressure electric selection and the above process, the total recovery rate of strontium can increase the total recovery rate by more than 15% before the use (with magnetic separation). It is also proved that the total mines in Xinjiang can significantly improve the total strontium ore dressing. Recovery rate. [next] Tantalum concentrate grade Ta 2 O 5 =20% ε =65~70% The electric separator CÐC-1000 drum type electric separator is used, and the ore heating temperature is 80-120 ° C, and the sorting granularity is less than 1 mm. For the electrification operation, the recovery rate of the sputum operation is 94.15%, the recovery rate of the cassiterite operation is 97.49%, and the recovery rate of the zircon operation is 93.89% (both minerals). High Efficiency Slurry Pump,Centrifugal Low Abrasive Slurry Pump,Hydraulic Pump,Lime Grinding Slurry Pump Shijiazhuang Zhongjia Slurry Pump Co.,Ltd. , https://www.zhongjiapump.com
In the world, the ore grades of antimony ore produced in countries such as Nigeria and South Africa are high (more than an order of magnitude higher than domestic ones). In addition, Malaysia, the Philippines, India and Thailand also recover a portion of the coltan from the sand mine. The content of the ore is not high, and the production of the Soviet Union is also growing, and the research and production in this area are highly valued.
China's antimony ore has many resources, some of which are Weijing granite primary deposits, and some of which are Weijing granite weathered deposits and sand deposits. Most of them use re-elected shakers to concentrate on coarse concentrates, and then use magnetic and electric separation. Choose to obtain the final antimony concentrate. At present, domestic demand for concentrates contains (Ta, Nb) 2 O 5 > 40%, and tantalum (Ta 2 O 5 ) is higher than 20%, but the proportion of ore that is currently mined is higher than that of tantalite. Big, and the performance of the cockroach is far worse.
According to our conditions, tantalum and niobium raw ore was obtained after reselection crude concentrate containing (Ta, Nb) -2O 5 about 2 to 4%, in addition to containing pyrite, tourmaline and the like bismuth foam, a large amount of gangue The mineral is garnet , followed by quartz , feldspar and mica . The use of strong magnetic separation efficiency is not high, mainly garnet is also a weak magnetic mineral, its magnetic is similar to the antimony ore, it is difficult to effectively separate them. The Φ120 × 1500mm high-voltage electric separator has poor sorting effect or can not be sorted.
DXJ type Φ320 × 900mm high pressure drum type electrostatic separator in some domestic tantalum and niobium ore (e.g., Xinjiang beneficiation plants, etc.) has been applied, generally obtain good results. Because in the coarse concentrate, the antimony ore belongs to the conductor ore, and a large number of garnet, quartz, feldspar, mica and zircon are all non-conductor mines, so they can be effectively separated by electro-election. The process and results of sorting the high-pressure electric separator into the antimony ore are shown in Figure 1 and Table 1. 
Figure 1 Yankuang electrification process
The following is a description of the actual production process of the Soviet coltan, which is symbiotic with other minerals such as cassiterite , zircon, ilmenite, garnet and monazite. The ore is a sand ore and is re-elected to give heavy minerals. The drum type electric separator is matched with the strong magnetic separator, and the shaker is used for re-selection to obtain qualified antimony concentrate. The process is shown in Figure 2.
Figure 2 Flow chart of the process of mineral processing in the Soviet coltan
Tinfoil grade Sn=49% ε =85~87%
Ilmenite content (referring to minerals) 96% ε = 94~96%
Some sand ore dressing plants in Guangdong and other places in China have similar minerals. The processes and equipment used are basically the same, and the ore dressing indicators are different. The difference between China and the Soviet Union is that there are too many strontium ore deposits, and there are fewer such deposits with high enthalpy.
Electric classification process of antimony ore
Tantalum and niobium-containing minerals are many high tantalum containing tantalum and niobium iron ore more sense of them. The past 20 years, due to the development of military industry, demand for the metal tantalum growing need plus a variety of other industries, so the production is also increasing. According to available materials, the world's annual production of antimony concentrates has exceeded 1,000 tons. Mineral tantalum-containing niobium power can not all selected separation, only tantalite, heavy tantalite, columbite, tantalum, manganese tantalite, niobium, titanium, tantalum, niobium, titanium, calcium, cerium, niobium ore and iron ore It has good conductivity and can be separated as a conductor in the electric selection, while pyrochlore and fine spar are poor conductors and cannot be separated by electric separation.
Table 1 Yankuang Electrification Index
name
Yield,%
Grade (TaNb) 2 O 5
Recovery rate,%
Note
Concentrate
Middle mine
Tailings
total
6.51
7.21
86.37
100.0
43.21
2.71
0.44
3.387
83.01
5.71
11.28
100.0
The ore is the crude concentrate obtained after re-election