GB/T 2286-2017 in English
VALIDDetermination of total sulfur composition of coke
- Issued on:2017-10-14
- Implemented on:2018-05-01
- File Format:PDF
- Delivery:Via email within 1~3 business days
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《GB/T 2286-2017焦炭全硫含量的测定方法》由TC469（全国煤化工标准化技术委员会）归口，TC469SC3（全国煤化工标准化技术委员会炼焦化学分会）执行，主管部门为国家标准化管理委员会。
Introduction
1. Standard Overview
GB/T 2286-2017 "Determination of Total Sulfur Content in Coke" replaces the previous GB/T 2286-2008 standard, mainly increasing the determination range of semi-coke (blue coke) and introducing coulometric titration and infrared spectroscopy. This standard is applicable to the determination of total sulfur content in coke and semi-coke products.
2. Background and Significance of Standard Formulation
With the development of the coking industry, the requirements for coke quality are becoming increasingly stringent. Sulfur content, as one of the key indicators, directly affects product quality and environmental performance. The release of the new standard ensures the scientificity, accuracy and operability of the determination method, and provides a unified technical specification for the industry.
3. Comparison of determination methods
| Method name | Principle description | Reagents and instruments | Precision |
|---|---|---|---|
| Eschka method | Sulfur is converted into sulfate by burning, and then the barium sulfate content is determined by barium chloride precipitation method. | Main reagents: Eschka reagent, hydrogen peroxide, hydrochloric acid solution; Instruments: Analytical balance, Muffle furnace. | Repeatability:≤0.04% (sulfur content ≤1.00); Reproducibility:≤0.10%. |
| High temperature combustion method | The sample is burned in an oxygen flow to generate sulfur oxides, which are absorbed by hydrogen peroxide solution and then titrated. | Main reagents: sodium hydroxide standard solution, sulfuric acid; Instruments and equipment: high temperature tube furnace, acid-base burette. | Repeatability:0.05%; Reproducibility:0.10%. |
| Coulometric titration method | The sample is burned under the action of a catalyst to generate sulfur dioxide, which is titrated with potassium iodide electrolyte. | Main reagents: potassium iodide, potassium bromide; Instruments: coulometric sulfur analyzer. | Repeatability:≤0.05% (sulfur content ≤1.00); Reproducibility:≤0.10%. |
| Infrared spectroscopy | Burn the sample at high temperature and detect the infrared characteristic absorption peak of sulfur dioxide. | Main reagents: anhydrous magnesium perchlorate; Instruments: infrared spectrometer. | Repeatability:≤0.05% (sulfur content ≤1.00); Reproducibility:≤0.10%. |
4. Technical details of each determination method
4.1 Application case of the Eschka method
In practical applications, the Eschka method is widely used for its high accuracy and precision. For example, in a coke production enterprise, the total sulfur content of the product was determined to be 0.85% by this method, which meets the national standard requirements.
4.2 Advantages of the high-temperature combustion method
The high-temperature combustion method is easy to operate and suitable for rapid detection in large-scale production. Its main advantage is that it does not require complex reagent preparation and is suitable for the determination of high-sulfur content samples.
4.3 Automation characteristics of coulometric titration
The coulometric titration method uses microcomputers to achieve automatic control, which significantly improves the determination efficiency and accuracy. This method is particularly suitable for online detection systems.
4.4 Environmental characteristics of infrared spectroscopy
Infrared spectroscopy does not require the use of harmful reagents and is green and environmentally friendly. Its rapid and non-destructive detection characteristics are highly favored in modern laboratories.
5. Implementation suggestions
- Choose a suitable method:According to the sample type and sulfur content range, the Eschka method or high-temperature combustion method is preferred; for occasions with high automation requirements, the coulometric titration method is recommended.
- Instrument calibration:Regularly calibrate the instrument with certified standard samples to ensure the reliability of the measurement results.
- Blank test:A blank test must be performed on each batch of samples to eliminate the influence of reagents and environmental factors.
- Quality control:Establish a complete quality control system, including repeatability and reproducibility verification, abnormal data processing, etc.
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