Microwave is a kind of high-frequency electromagnetic wave. Through the microwave pre-treated ore, its grindability is improved, and the grinding efficiency is improved, and the grinding grain size at the same time is reduced, so that the grinding energy consumption is reduced.
The calcite quality is reduced between 400 ℃ and 700 ℃at microwave temperatures. The temperature at which calcite begins to decompose is around 800 ℃. When calcite is not decomposed, the decrease in mass is due to the loss of internal moisture and CO2 in the calcite, causing the internal and external pressure difference of the ore to cause the calcite matrix to break, and the internal fracture of the ore is cracked. The grindability of calcite is improved, the particle size of calcite grinding products is reduced, and the grinding efficiency of calcite is improved. However, when the microwave temperature reaches 800 ℃, the calcination of calcite begins to decompose into calcium oxide, which leads to a significant increase in the quality of the ore. The decomposition of the calcite begins to cause the fractured components to re-adhere, resulting in a weakening of the grinding aid.
The longer the microwave treatment is, the higher the temperature of the ore grows; the higher the microwave power gets, the faster the ore heats up. Microwave pretreatment of calcite minerals can improve the grindability of the ore and increase the productivity of the mill, reaching a maximum at a microwave temperature of 700 ℃. 1.453 t / (m3 / h). When the microwave temperature is too high, the decomposition of the calcite will cause the broken components to re-adhere and reduce the grindability of the ore. It is therefore necessary to select a suitable microwave treatment time and temperature.
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