The general methods for determining the ash content in coal are slow ashing method and fast ashing method. The slow ashing method is an arbitration method; the fast ashing method can be used as a routine analysis method. Generally, the equipment needed is: high temperature muffle furnace, 0.1mg analytical balance, glass desiccator, container, etc.
Below we briefly introduce the steps of slow ashing method to measure ash:
Key points of the method: Weigh 1g of air-dried coal sample, put it into a high-temperature muffle furnace below 100°C, raise the temperature to 500°C, keep it for 30min, then raise it to (815±10)°C and burn for 1h until the mass is constant. The ash yield was defined as the percentage of the mass of ash to the mass of the coal sample.
1. Weigh (1±0.1) g (1±0.1) g (accurate to 0.002 g) of an air-dried coal sample with a particle size of less than 0.2 mm in a container that has been pre-burned to a constant mass and weighed (accurate to 0.0002 g), shake Evenly, flatten.
2. Put it into a muffle furnace whose temperature does not exceed 100°C, close the furnace door and maintain good ventilation during the ashing process. For this reason, the muffle furnace must have a chimney; slowly raise the furnace temperature to 500°C within a certain period of time. °C and kept at this temperature for 30 min. Continue to heat up to (815±10)°C, and burn at this temperature for 1h.
3. Take out the container from the furnace, cool it in the air for about 5 minutes, move it into a desiccator to cool to room temperature, and weigh it. Or if the ash content is greater than 15%, perform inspection burning for 20 minutes each time until the mass change of two consecutive burnings does not exceed 0.001g, and the mass after the last burning is taken as the basis for calculation.
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