China's rare earth metals mine mainly open-pit mining, underground mining is the only individual mines. The open pit mining is mainly Baiyun Obo iron - salt , rare earth mines and some sand mines, leaching rare earth mines and rare, rare earth weathering shells and other mines. Underground mining mines currently only have Shandong Weishan Rare Earth Mine.
The Baiyun Obo iron-salt and rare earth mines began construction in 1956 with a design scale of 12 million t/a, which is a large-scale open-air mechanized mining mine. Its development system is jointly developed for railways and highways, and the mining method is the comprehensive mining method. Shandong Weishan Rare Earth Mine adopts shaft mechanized mining.
Sand mines, mainly for the exploitation of coastal sand mines, have two types: state-owned mining and civilian mining. There are two ways of state mining: one is the bucket mining excavator, the cone concentrator or the mobile mining process with the loader and spiral concentrator as the main body. The production scale is large, with water saving and province. The advantages of high electricity and resource utilization, high metal recovery rate and low cost. Since the 1980s, many mine mining joint approach with this beach placer mining (titanium ore, rutile, zircon, quartz, monazite, xenotime, etc.). The other is a mining process using a water gun, a sand pump, and a rough chute. There are three main ways of mining. First, all are artificial mining and manual washing. This is a primitive and backward method with low recovery rate and serious waste of resources. The second is semi-mechanized mining. The water supply and tailings are mechanized, but the mining is still artificial. The beneficiation still uses triangular troughs and the recovery rate is low. There are still many private mines that use this way to mine coastal sand mines and river alluvial. placer. The third is small mechanized mining, using pontoons and sand pumps for mining, rough selection with spiral chutes, water supply with pumps, tailings with sand pumps, mechanization in mining, and recovery and resource utilization are significantly improved over the first two methods. The labor intensity of workers has also been reduced, which is the basic direction of civilian mining mountains in the future.
The weathering shell leaching type rare earth deposit is easy to mine. Because rare earth elements are adsorbed on the surface of clay minerals in an ionic state, the ore is soil- like and soft, and can be mined by using sputum, hoe and trolley as tools. Therefore, this simple method is widely used in folk mining. mining. Rare earth element extraction does not require mechanical beneficiation, and a relatively rare chemical treatment can be used to obtain a mixed rare earth oxide. State-owned mining has achieved simple semi-mechanization or full mechanization, and the extraction process is also improving day by day.
R410A is an HFC blend designed for new R22 applications. It operates at higher pressures than many other refrigerants, and so cannot be used to retrofit R22 systems. Systems designed for R410A can take advantage of its ability to use smaller components, making it a key refrigerant for domestic and light air conditioning equipment. R410A's low glide also makes it suitable for some centrifugal compressors, and it can operate in low temperature applications.
High Quality R410A Gas,R410A Refrigerant,Blend Refrigerant Gas R410A,Mixed Refrigerant Gas R410A
Zhejiang Jinze Refrigerant Co.,Ltd , https://www.uiszl.com