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According to the degree of coalification, coal could be divided into three categories: brown coal, bituminite, and coal. Hard coal was a general term for bituminite and anthracite. Among them, brown coal was the mineral coal with the lowest degree of coalification. Its ash value was generally between 20% - 30%. It was rich in volatile components, easy to burn and smoke, and the combustion would produce more ash floating in the air. Bituminous coal has a moderate degree of coalification, with a carbon content of 80% - 90%, a hydrogen content of 4% - 6%, and an oxygen content of 10% - 15%. It is relatively black in color, and the dyed hand is black. It is dense and brittle, and the stripes are black. When it burns, it emits thick smoke. According to the volatile content, the thickness of the colloid layer, or the technological properties, it could also be divided into long flame coal, gas coal, fat coal, coke coal, lean coal, and lean coal. The coal with the highest degree of coalification had a high fixed carbon content, the least impurities, low volatile components, and a high ignition point. It was not easy to burn on fire, and the burning flame was not obvious or even non-existent. From the point of view of usage, it could also be divided into thermal coal and so on. The thermal coal was mainly used to generate energy for heating or to drive mechanical movements and then convert it into other energy. In addition, China's coal could be divided into 17 sub-categories, namely, smokeless coal, lean coal, poor-lean coal, lean coal, coke coal, fat coal, 1/3 coke coal, gas-fat coal, gas coal, 1/2 medium-sticky coal, weakly sticky coal, non-sticky coal, long-flame coal, brown coal, etc.

The coal miners, often treated like slaves by the so - called coal kings, faced extremely harsh conditions. They worked long hours in dangerous mines with little pay. For example, they had to endure the constant threat of cave - ins and toxic gases. Their living quarters were usually shabby and overcrowded, and they had few rights or protections.

Open pit coal mines should use mine safety certification. The coal safety certification was applicable to underground coal mines, while the mine safety certification was applicable to other metal or non-metal mines that were not coal mines. The open-pit coal mine belonged to the category of non-coal mines, so the mine safety certification should be used. If you want to know more about the follow-up, click on the link and read it!

There were many ways to mine coal. The following conclusions were made: The methods of coal mining could be divided into underground mining and open-pit mining. Underground mining was divided into two categories: wall mining and pillar mining. The wall mining method was featured by a long coal wall, and the roadways at both ends of the working face were used for air intake, air return, coal transportation, and material transportation. The pillar mining method was featured by a short coal wall in the shape of a square pillar, and a large number of working faces were mined at the same time. The specific coal mining methods included strike longwall mining method, inclined longwall mining method, inclined slicing mining method, and longwall top coal mining method. The strike longwall mining method was a mining method that advanced along the strike, the inclined longwall mining method was a mining method that advanced along the inclined, the inclined slicing mining method was a mining method that divided the thick coal seam into slices along the inclined plane, and the longwall top coal mining method was a mining method that first mined the coal at the bottom of the longwall working face of the gently inclined thick coal seam, and then used the top coal mining method. In addition, open-pit coal mining was also a common method of coal mining. The open-pit coal mining has the characteristics of large mining capacity, fast construction speed, high labor efficiency, low production cost, excellent labor environment, guaranteed safety, and high resource recovery rate. Open pit mining had become the main method of coal mining in the world's major coal mining countries. In summary, coal mining methods included underground mining and open pit mining. Underground mining was divided into two categories: wall mining and pillar mining. The specific methods included strike longwall mining, inclined longwall mining, inclined slicing mining, and longwall top coal mining. Opencast coal mining was also a common method.

Judging which type of coal was the "best" depended on a variety of factors, such as its use, coal quality characteristics, and so on. From the perspective of the degree of coalification, the coal with the highest degree of coalification had a high fixed carbon content, the lowest impurity content, and low volatile components. In terms of application, the smokeless coal could be used in fertilizer (nitrogen fertilizer, synthetic nitrogen), ceramic, manufacturing and forging industries; the pulverized coal could be used in the smelting industry, and could also be used for the filtering and purification of domestic and industrial water supply. From the perspective of burning to generate energy for heating or driving mechanical movement (thermal coal use), the coal with the lowest economic cost would be selected as the "best" choice. Although every type of coal could be burned, factors such as cost and combustion efficiency had to be considered. Bituminous coal could be divided into many types according to the volatile content, the thickness of the colloid layer, or the technological properties. It was a medium-level coal with a carbon content of 80% - 90%, a hydrogen content of 4% - 6%, and an oxygen content of 10% - 15%. It was mainly used as boiler fuel and raw materials for coke making. It could also be used to make gas and coal oil. Lignite was the mineral coal with the lowest degree of coalification. It was rich in volatile components and easy to burn and smoke. Burning it would produce more ash, but it could become an important chemical raw material after processing. Therefore, there was no absolute "best" coal, but the most suitable coal was judged according to specific needs and conditions.

He recommended a few good novels. " Great Song: From the County Magistrate of the Border to the Power of the World " was a historical novel written by Black Wind Cave. In the first year of Jingyou, the state of many famous people at that time was described in a very interesting way. There was a little butterfly that wanted to change something. Its original name was " Jingyou New Wind." Although there were small problems, it was worth watching. " Taoist Descends the Mountain: Starting from Visiting Ninth Uncle " was a Xianxia novel about riding a dragon to climb the sky. Lin Zhennan exorcised ghosts and exterminated zombies in Ninth Uncle's world. "Douluo's Golden Sparkling" was a light novel that could fill one's face with livers. The main character, Su Yuntian, was Su Yuntao's younger brother. He had inherited Gilgamesh's legacy. The story in Spirit Hall was extremely exciting. The author's plot control was quite good. It was a harem novel. Miner, a game novel written by Aiduo. The keyword was Fourth Brother. " God Grade Mine Owner " was an urban novel with colorful shells. It was a system novel. The main character relied on the system to dominate the mining industry. Although the writing was average, the plot was smooth. It was recommended with four stars. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>

" Selling the coal mine at the beginning, I support half of the entertainment industry " was a novel about an urban entertainment star. The author was Meng. The story was about the protagonist's legendary life of being reborn from the past, imagining the future, and successfully supporting half of the entertainment industry by selling the coal mine. The novel had already reached chapter 123, with a total of 250,800 words.

I'm not sure specifically which 'coal top stories' you are referring to. It could be about new coal mining technologies, environmental impacts of coal usage, or coal industry news in a particular region.

Laoheishan Hongzheng Coal Mine was a coal mine located in Laoheishan Town, Dongning County, Heilongjiang Province. According to the information provided, the mine adopted the inclined shaft development method, with a recoverable reserve of 5,417,600 tons and a service life of 12.9 years. The coal produced by the mine was long flame coal, which could be used for power and civil use. The total construction period of the mine reconstruction and expansion project was 21 months, and the total investment was estimated to be 112,398,900 yuan. According to the public announcement, the project did not require land acquisition. Regarding the impact of the project, the main issues that the public was asked for included understanding the project, the surrounding environment of the residential area, the impact on life, concerns, the impact on traffic, and the impact on income. However, the information provided about the specific impact of the Hongzheng coal mine and the details of the social stability risk assessment was not enough to give a definite answer.