The coal industry refers to an industry that mainly extracts coal resources. It is one of the main sources of national energy and an important pillar of the national economy. There are a large number of enterprises in China's coal circulation industry, and the scale is relatively small. The total number of coal circulation enterprises in China is about 100,000, and the scale is relatively small. This is mainly because China's coal production and consumption enterprises are relatively scattered, and the industry concentration is low, which provides living space for coal circulation service providers of different sizes. The state is vigorously promoting the integration of coal mining enterprises, and the coal circulation market will also tend to be concentrated, which will gradually increase the market access barriers for coal circulation enterprises, and the living space for small-scale coal circulation enterprises will continue to shrink, and large-scale, cross-regional circulation service providers will become the mainstream.
Cement: Powdered hydraulic inorganic cementitious material. When mixed with water, it forms a slurry that can harden in air or water, and can firmly bond materials such as sand and stone together. Cement is classified according to its use and performance into: (1) General-purpose cement: Cement commonly used in general civil engineering construction. General-purpose cement mainly refers to the six major types of cement specified in GB175—2007, namely Portland cement, ordinary Portland cement, slag Portland cement, pozzolanic Portland cement, fly ash Portland cement, and composite Portland cement. (2) Special cement: Cement with special properties or uses, such as G-grade oil well cement, rapid-hardening Portland cement, road Portland cement, aluminate cement, sulfoaluminate cement, etc.
Metallurgy refers to the process and technology of extracting metals or metal compounds from minerals and using various processing methods to make metals into metallic materials with certain properties. Metallurgy has a long history of development, from the Stone Age to the subsequent Bronze Age, and then to the large-scale development of modern iron and steel smelting. The history of human development is integrated with the history of metallurgical development. The technologies of metallurgy mainly include pyrometallurgy, hydrometallurgy, and electrometallurgy. With the successful application of physical chemistry in metallurgy, metallurgy has moved from technology to science, and thus there is a metallurgical engineering major in universities.
Minerals generally refer to all natural mineral or rock resources buried underground (or distributed on the surface, or weathered from rocks, or deposited from rocks) that can be used by humans. The classification of mineral resources mainly includes: According to the genesis and formation conditions of minerals, they are divided into endogenic minerals, exogenic minerals, and metamorphic minerals; According to the material composition and structural characteristics of minerals, they are divided into inorganic minerals and organic minerals; According to the occurrence state of minerals, they are divided into solid minerals, liquid minerals, and gaseous minerals; According to the characteristics and main uses of minerals, they are divided into energy minerals, metallic minerals, non-metallic minerals, and water and gas minerals.
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