From the mini-black and white screen of a few pixels to the stunning full screen of several megapixels, technological progress is so amazing. However, cell phones have an important component that has not been greatly improved for decades. The most talked about by people is battery. In t ....

In the process of mine production, a large amount of fine dust containing free silica is generated, and the miners inhale these dusts to cause lung disease and get lung cancer. The factors that cause silicosis in the mine are: 1 Dust weight concentration (mg/m3); 2 dust dispersion, less than 5μ ....

The first type: jaw crusher The jaw crusher of the jaw crusher (also known as the tiger mouth) appeared in 1858 and has a large crushing ratio. Jaw crusher product size uniform, simple structure, reliable operation, easy maintenance, operating costs and economic characteristics, is a crushing devic ....

Spontaneous coal must have three conditions: the spontaneous combustion tendency of coal itself; continuously supplying a suitable amount of air; and poor heat dissipation, heat can be produced by oxidation of coal accumulation. Coal itself has a tendency to spontaneous combustion, that is, it has ....

Cable fever analysis When the power cable passes certain load current, it will heat up. With the increase of load current, the temperature of the cable surface will be higher. If it is not handled in time, the consequences can be imagined. Such as: polyvinyl chloride (PVC) cable is based on the c ....

At present, nano-scale calcium carbonate has been industrialized in China, different carbonization methods have emerged, and the scale production has been increasing. The application fields have also been rapidly expanded from rubber, ink and other industries to plastics, coatings, adhesives and pa ....

1 power plant is the largest user of coal China's power plants are mainly coal-fired power plants, and about 80% of the power generation comes from thermal power. According to the development plan of China's power industry, at least in the first 20 years of the 21st century, it will mainta ....