JC/T 2437-2018 in English
VALIDMethods for chemical analysis of flue gas desulfurization gypsum
- Issued on:2018-04-30
- Implemented on:2018-09-01
- File Format:PDF
- Delivery:Via email within 1~3 business days
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本标准规定了烟气脱硫石膏化学分析方法的基准法和代用法。
本标准适用于采用石灰石/石灰－石膏湿法对含硫烟气进行脱硫净化处理而产生的以二水硫酸钙（CaSO4·2H2O）为主要成分的烟气脱硫石膏的化学成分分析。
Introduction
Technical background of the standard
This standard is formulated for industrial by-products produced by the limestone/lime-gypsum wet flue gas desulfurization process. For the first time, it systematically regulates the chemical analysis method of flue gas desulfurization gypsum with dihydrate calcium sulfate (CaSO4·2H2O) as the main component. With the improvement of environmental protection requirements, the 2018 version has added new pollutant detection items such as total organic carbon and ammonia nitrogen.
Comparison of core detection methods
| Test items | Benchmark method | Substitute method | Key equipment |
|---|---|---|---|
| Carbonate | Hydrochloric acid neutralization titration | - | Constant temperature water bath, Precision balance |
| Chloride ion | Ammonium thiocyanate volumetric method | Potentiometric titration/Silver nitrate titration | Acidity meter, Magnetic stirrer |
| Iron trioxide | Phenanthroline spectrophotometry | EDTA direct titration | Spectrophotometer |
Detailed explanation of key detection technologies
Key points for carbonate determination
When using the acid-base titration method with a double end-point indicator (Taslow indicator), special attention should be paid to the following:
- The reaction temperature should be controlled within the range of 50-70℃
- The amount of hydrogen peroxide added should be accurate to 5 drops (about 0.25mL)
- Repeatability limit 0.20%, reproducibility limit 0.30%
Innovation in ammonia determination
Use pre-distillation-Nessler reagent spectrophotometry combined technology:
Actual case: In the detection of desulfurization gypsum in a power plant, it was found that when the sample contained 0.5mg/kg ammonia, strict control was required:
- Distillation rate 10mL/min
- The pH value of the distillate was adjusted to 11.0±0.1
- Use newly prepared boric acid absorption liquid
Standard implementation recommendations
Laboratory configuration requirements
- The balance room needs to maintain constant temperature and humidity (23±2℃)
- At least equipped with a 0.0001g precision analytical balance
- The wavelength range of the UV spectrophotometer should cover 200-800nm
Quality Control Measures
It is recommended to use standard substances (such as NIST SRM 88b) for method validation, with special attention to:
- Make two parallel samples for each batch of samples
- Control the drying temperature at 45±3℃ when determining the crystal water
- Blank correction is required for the determination of the endpoint of chloride ion titration
Prospects for Standard Development
With the promotion of ultra-low emission technology, future versions may add:
- Heavy metal element detection method
- Radioactive index control requirements
- X-ray diffraction quantitative analysis method
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