GB/T 39201-2020 in English
VALIDTechnical specifications for extraction of aluminum oxide from high-alumina fly ash
- Issued on:2020-10-11
- Implemented on:2021-05-01
- File Format:PDF
- Delivery:Via email within 5 business days
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《GB/T 39201-2020高铝粉煤灰提取氧化铝技术规范》由TC415（全国产品回收利用基础与管理标准化技术委员会）归口，主管部门为国家标准化管理委员会。
Introduction
Interpretation of the core content of the standard
This standard specifies the full-process technical requirements for extracting alumina from high-alumina fly ash using the pre-desiliconized soda-lime sintering method, with a focus on controlling the raw material characteristics of aluminum-silicon ratio ≥1.0 and Al2O3 content ≥40%.
Comparison of key technical indicators
| Process links | Key parameters | Control range | Detection method |
|---|---|---|---|
| Pre-desiliconization | Circulating alkali solution NRk | 90-110g/L | Appendix B |
| Clinker sintering | Sintering temperature | 1200-1300℃ | GB/T1574 |
| Crude liquor desiliconization | Silicon content index | First stage ≥300 Second stage ≥550 | Appendix C |
Analysis of process innovations
Optimization of pre-desiliconization process
By leaching amorphous SiO2 with caustic soda, the aluminum-silicon ratio is increased from ≥1.0 to ≥2.0, significantly improving the subsequent sintering efficiency. Typical operating parameters:
- Reaction temperature: 115-120℃
- Reaction time: 30min
- Sodium silicate solution SiO2 concentration: ≥43g/L
By-product resource recovery path
The standard specifically regulates the reuse of silica-calcium slag (2CaO·SiO2):
- Building material admixtures (cement, concrete)
- Pavement stabilization base material
- Metal gallium enrichment and recovery
Implementation suggestions
Key points of quality control
It is recommended to establish a three-level detection system:
| Raw material detection | Key monitoring of limestone CaO ≥ 51% |
| Process control | Real-time monitoring of dissolution rate ηAl ≥ 91% |
| Finished product inspection | Alumina ignition loss ≤ 1.0% |
Environmental compliance requirements
To be implemented simultaneously:
- GB25465 (pollutant emissions)
- GB18599 (solid waste disposal)
- Hazardous waste identification standards
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