目前中国煤炭分类国家标准中，唯独对天然焦没有明确的分类指标。
In China national standards of coal classification, there only no type division of natural coke so far.
天然焦具有良好的物性条件，含有大量的瓦斯气体，是一个理想的储气层。
Natural coke has good conditions of physical character, and contain abundant coalbed gas, is an ideal reservoir of gas.
针对矿井剩余煤炭储量接近枯竭的实际情况，进行了天然焦开采工艺研究。
In view of the mine actual situation of coal resource approaching exhausted, natural coke excavation craft was studied.
接触变质带可进一步划分为岩焦混杂带、天然焦带、焦化煤带、正常煤带。
The contact metamorphic zone may be further divided into coking coal mixing zone, natural coke zone, coking coal zone and normal coal zone.
本文从生产型煤和型焦的需要出发，研究岩浆变质作用所形成的天然焦炭和高、中变质煤的显微结构。
The paper studies the microstructures of the cokeite and the high, middle metamorphic coal, formed by the metamorphism of magma in view of the need for producing moulding coal and coke.
人造石墨、煅烧石油焦、天然石墨、焦炭、以及用这类材料配成的混合料。
Commonly used for cast iron carbon additive materials are: artificial graphite, calcined petro coke, nature graphite, coke, and as the mixture with these materials.
人造石墨、煅烧石油焦、天然石墨、焦炭、以及用这类材料配成的混合料。
Commonly used for cast iron carbon additive materials are: artificial graphite, calcined petro coke, nature graphite, coke, and as the mixture with these materials.
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