GB/T 36167-2018 in English
VALIDMethod for coal preparation laboratory timed-release flotation analysis
- Issued on:2018-05-14
- Implemented on:2018-09-01
- File Format:PDF
- Delivery:Via email within 1~3 business days
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《GB/T 36167-2018选煤实验室分步释放浮选试验方法》由TC42（全国煤炭标准化技术委员会）归口，TC42SC3（全国煤炭标准化技术委员会选煤分会）执行，主管部门为中国煤炭工业协会。
Introduction
Interpretation of GB/T 36167-2018, the national standard of the People's Republic of China
1. Overview of the standard
GB/T 36167-2018 "Coal Preparation Laboratory Step-Release Flotation Test Method" specifies the test method for separating coal powder (mud) into several parts with different ash contents according to their floatability through one roughing and multiple fine cleaning. This standard is applicable to bituminous coal and anthracite with a particle size of less than $0.5\mathrm{mm}$.
2. Background of standard formulation and analysis of technological evolution
With the improvement of coal industry's requirements for coal preparation technology, traditional flotation test methods have been unable to meet the refined needs. GB/T 36167-2018 was formulated based on actual production experience and combined with modern experimental technology to provide a more accurate and highly repeatable step-release flotation test method.
The standard adopts orthogonal design to optimize the test conditions to ensure the best flotation effect under different coal quality conditions. This technological evolution has significantly improved the coal preparation efficiency and clean coal recovery rate, which is of great significance to improving the level of coal utilization.
3. Experimental equipment and instruments
- Flotation machine: in accordance with GB/T4757, the flotation cell volume is $1.5\mathrm{~L}$.
- Micro syringe: capacity $0.25\mathrm{mL}, 0.5\mathrm{mL}$, graduation value $0.01\mathrm{mL}$.
- Micro-injector: Capacity $0.025\mathrm{mL}, 0.05\mathrm{mL}$, graduation value $0.0005\mathrm{mL}$.
- Collector: n-dodecane (chemical reagent) $\mathrm{C_{12}H_{26}}$.
- Foaming agent: 2-octanol (chemical reagent) $)\mathrm{C}_{8}\mathrm{H}_{17}\mathrm{OH}$.
4. Experimental steps and technical points
| Step number | Operation content | Key parameters | Precautions |
|---|---|---|---|
| 1 | Preparation of flotation machine | Impeller speed $1800\pm10 \mathrm{r/min}$ | Ensure the water level is accurate and the equipment is debugged in place |
| 2 | Add coal sample | Slurry concentration$60~{\mathrm{g}}/{\mathrm{L}},80~{\mathrm{g}}/{\mathrm{L}},100~{\mathrm{g}}/{\mathrm{L}}$ | Coal sample weighing accuracy to$0.1\mathrm{g}$ |
| 3 | Flotation agent addition | Collector dosage$800~\mathrm{g/t} \text{ to} 2500~\mathrm{g/t}$ | Stirring time$2~\mathrm{min}$ |
Implementation case analysis
A coal preparation plant used this standard to conduct experiments and successfully controlled the ash content of clean coal within the required range, increasing the flotation efficiency by an average of $15\%$. This case demonstrates the effectiveness and operability of the standard in actual production.
5. Implementation Suggestions
- Select the amount of collector and frother strictly in accordance with the standard to ensure the optimal combination of test conditions.
- Regularly calibrate the flotation machine and measuring instruments to ensure the accuracy of the experimental data.
- Flexibly adjust the test parameters according to the characteristics of different coal qualities to optimize the flotation effect.
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