GB/T 20475.1-2006Classification of the content of harmful elements in coal - Part 1: Phosphorus (English PDF)

GB/T 20475.1-2006 is the English-translated version of 煤中有害素含量分级 第1部分：磷.

China's national classification of coal by phosphorus content. It is Part 1 of GB/T 20475 and specifies the ranges, names and codes into which coal is classified by its dry-basis phosphorus content, together with the phosphorus requirements applying to the production, processing and utilisation of coal.

It applies to coal exploration, production, processing, marketing and utilisation. Phosphorus in coal matters almost entirely because of coke.

Phosphorus is not removed in the coke oven and is not removed in the blast furnace either: essentially all of it that enters with the coke and the ore reports to the hot metal, and from there it must be removed in the steelmaking vessel at a cost in time, flux, slag volume and iron yield.

Phosphorus in steel causes cold shortness, so the specification on the finished product is tight, and every source of it in the burden is therefore controlled.

Coking coal is bought against a phosphorus limit as well as against ash, sulfur and caking properties, and a coal that fails on phosphorus is worth much less because it can only be blended in small proportion.

Classifying the resource by phosphorus content, rather than only specifying individual cargoes, is what allows the reserve to be planned: a deposit is known in advance to be low, medium or high phosphorus, and washing plants, blends and contracts are arranged accordingly.

The standard fixes the boundaries between the classes, the name and the code of each, and refers the determination and the sampling to the coal sampling and analysis standards, so that a class assigned in exploration and a class assigned on a delivered cargo mean the same thing. Issued on 12 September 2006 and in force since 1 February 2007.

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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 15 pages — is available in the English PDF.

GB/T 20475.2-2006|GB/T 20475.3-2012|GB/T 20475.4-2012|GB/T 216-2003|GB/T 15224.1-2018|GB/T 15224.2-2010

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