Standard No.:	GB/T 4000-2017
Chinese Name:	焦炭反应性及反应后强度试验方法
English Name:	Determination of coke reactivityindex(CRI) and coke strength after reaction(CSR)
Professional Classification:	H32 Coke
ICS Classification:	75.160.10 Solid fuels
Issued by:
Issued on:	2017-10-14
Implemented on:	2018-05-01
Status:	VALID
Replace:	GB/T4000-2008 Coke - Determination of reactivity and strength after reaction
Language:	English
File Format:	PDF
Word Count:	12000 words
Price(USD):	360 (USD)
Delivery:	via email in 1-3 business day

1 Scope

This standard specifies the principle, test instruments, equipment and materials, sampling and preparation of specimen, test procedures, result calculation and precision of determination of coke reactivity index (CRI) and coke strength after reaction (CSR).

This standard is applicable to the determination of reactivity index and strength after reaction of the coke for iron smelting in blast furnace, and it may be referred to the determination of reactivity index and strength after reaction of the coke for other purpose.

2 Normative References

The following documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.

GB/T 1997 Coke - Sampling and Preparation of Samples
YB/T 4494 Technical Specification of Mechanical Sample Preparation for Measuring Coke Reactivity Index and Coke Strength after Reaction

3 Principle

Weigh a certain amount of coke specimen and place in a reactor; after reacting with carbon dioxide at 1100℃ for 2h, the Coke Reactivity Index (referred to as CRI) is expressed as a percentage of coke mass loss.

After the coke reacts, it’s subject to Type I drum test, and the Coke Strength After Reaction (referred to as CSR) is expressed as a percentage of the mass of coke with size greater than 10mm and that of coke after reaction.

4 Test instruments, Equipment and Materials

4.1 Electric furnace

Electric furnace wire, silicon carbide or other heating element meeting test requirements may be used for electric furnace. In the furnace, the length of (1100±3)℃ thermostatic area is not less than 150mm; a three-section heating furnace (schematic diagram is shown in Figure 1) is preferably adopted to ensure that the temperature of the gas entering into the specimen layer and the temperature in the whole specimen layer are kept at (1100 ± 3) ℃ where carbon dioxide reacts with coke specimen. Single-point temperature-measuring heating furnace may also be adopted, see Annex A.