How is pulp ash content determined?
Pulp ash content refers to the content of inorganic substances in pulp except fibers, including calcium, magnesium, sodium, iron, aluminum and other elements. The commonly used determination method is the ash method, and its main steps are as follows:
Sample preparation: Weigh a certain amount of pulp sample and record its weight, and put it into a weighing bottle or ash tray.
Drying: Place the sample in a Drying Oven at 105°C-110°C to dry to constant weight. It usually takes 1-2 hours of drying to reach a constant weight state.
Cooling: Take out the sample and place it in a Drying Oven to cool naturally.
Programmed heating: put the weighing bottle or furnace ash dish together with the sample in the oven, heat to 550°C-600°C, and bake for 2-3 hours to burn the organic matter and leave only the inorganic matter or ash.
Cooling and weighing: take out the sample, place it in a Drying Oven to cool naturally, then re-weigh the sample and the weighing bottle or furnace ash tray to obtain the weight of the sample ash.
Calculation: The formula for calculating the ash content is: ash content (%) = (sample ash weight/sample weight) × 100%.
North and South Chao reminds you: In order to avoid errors when measuring ash content, you need to pay attention to details such as the accuracy of weighing, the control of heating temperature and time, and the time of drying and cooling.
