1 coal industry status 1.1 Problems caused by coal mining and utilization China produces nearly 1.3 billion tons of coal per year. Most of the coal is directly burned as energy. The coal processed by deep processing is less than 30%, which seriously pollutes the environment. The cumulative amount -----
The floatability of fluorite and barite is similar, and it is difficult to separate them by flotation. Fluorite and barite separation flotation can use the preferential flotation process to inhibit gangue and other gangue, flotation fluorite; can also use the first floating barite, after floating fl-----
Intelligent lighting refers to the use of computer, wireless communication data transmission, spread spectrum power carrier communication technology, computer intelligent information processing and energy-saving electrical control technology to form a distributed wireless telemetry, remote control, -----
First, the classification of scraper conveyor According to the arrangement and structure of the scraper conveyor chute, it can be divided into side by side and overlap type. According to the number and arrangement of the scraper chain of the scraper conveyor, it is divided into single chain, doubl-----
From the perspective of name, "integrated video surveillance system" means that it is not only simple as video surveillance. With the rapid development of China's high-speed rail business, more and more security companies are concerned about the high-speed rail field, and competition-----
For the production of flour mills, the extraction rate of wheat has a direct impact on the economic benefits of flour mills. With low wheat flour production rates, the cost is high. On the contrary, the cost will decline. Therefore, raising the flour yield of wheat is one of the current -----
  The overburden layer in the sublevel caving method without bottom column not only plays a role in damaging the impact of the surrounding rock when it is falling, but also provides extrusion blasting conditions to prevent the ore from being scattered in the goaf and ensuring normal mining. -----