What does the loss on ignition of limestone mean
The loss on ignition of limestone is a key indicator for evaluating its quality and applicability, playing an important role in various fields such as building materials, metallurgy, and chemical engineering.
Concept connotation
The loss on ignition of limestone refers to the percentage of mass loss caused by chemical reactions such as decomposition and volatilization of internal substances after sufficient burning of limestone samples under specific high temperature conditions (usually 950 ℃ -1050 ℃). This indicator intuitively reflects the content of volatile and easily decomposable components in limestone, mainly including carbon dioxide produced by the decomposition of calcium carbonate, carbon dioxide produced by the decomposition of magnesium carbonate, gases produced by the combustion of organic matter, as well as water and gas losses caused by water evaporation and dehydration of clay minerals.
Measurement method
Accurate determination of loss on ignition requires strict adherence to standard procedures. Take a certain amount of dried and finely ground limestone sample, place it in a high-temperature furnace and burn it at a constant temperature. After the mass is constant, compare the mass difference before and after burning, and calculate the loss on ignition value. During the process, variables such as burning temperature and time need to be controlled to ensure accurate results.
Practical application significance
In the production of building materials, excessive loss on ignition can cause defects such as holes and cracks in lime products, reducing their strength and durability; In the metallurgical industry, high heat loss affects the permeability of furnace materials, increasing energy consumption and impurity content. Therefore, the loss on ignition is an important basis for quality control and material selection of limestone.
