In recent years, through the analysis of the static excitation system of large and medium-sized synchronous generators on the system transient stability, relay protection and shafting torsional vibration, it is generally believed that this excitation method has fast response speed, simple wiring

I. Mineral occurrence and embedding characteristics Phosphorus ore gum: sea phosphate ore, predominantly collophane false output oolitic structure, mainly disseminated grain size range of about 0.05 ~ 0.3 mm, metal fine disseminated. Collophane gangue minerals mosaic complex relations: one contain

Outside the production process and the complexity of the diversity of the mineral composition, the rare earth metallurgical production process in addition to producing various forms of rare earth products, will be accompanied by a certain amount of "waste", i.e. gas, waste water and waste

There are more than ten kinds of tin- containing minerals. At present, the tin used in industry is mainly derived from cassiterite. Due to the high density of cassiterite (6.4~7.1g/cm3), the main beneficiation method of cassiterite is re-election. However, due to the brittleness of the cassiterite,

Model NO.: 241/630CAKW33 Brand: Lyhy Custom Design: Available

2016 can be said to be the year of China's luxury car market harvest, the market size exceeded 2 million for the first time, an increase of more than 16%. Under this circumstance, the domestic luxury car market is also changing, and the inherent pattern will be broken. The first camp remained

The portable GC/MS is mainly used for qualitative and quantitative detection of volatile semi-volatile organic pollutants in the atmosphere, water, and soil. With the increasing emphasis on environmental monitoring in China, the portable GC/MS has a broad prospect in China. Champ Consulti

The multimeter is used to measure the voltage and determine the continuity of the circuit, widely used by the public, but there are many errors in the use of the process, often leading to damage to the multimeter. How to use it properly and protect it, the author thinks should pay attentio

Model NO.: OTS Position of Pump Shaft: Horizontal Pump Pump Casing Combined: Horizontal or Vertical Split Case

After the association's recommendation, expert evaluation and public announcement, 37 mining companies nationwide have been identified by the Ministry of Land and Resources as the first batch of national green mine pilot units. Kaifeng Group has become the only chemical company in Guizhou Prov

“Efforts to build beautiful China and realize the sustainable development of the Chinese nation.” The report of the 18th National Congress of the Communist Party of China raised the level of China’s ecological civilization to a level that concerns the development of the nation.

Multi metal sulfide ores Ore primarily copper, lead, zinc and sulfur. Lead ore or zinc ore of a single metal in nature is rare. Commonly used are lead-zinc, copper-zinc, copper-lead-zinc, lead-zinc-sulfur, copper-lead-zinc-sulfur symbiotic ore. These ores contain more or less pyrite or pyrrhotite.