Of course. Salt can be heated in a microwave oven, but not for too long. It can be heated directly in the pan. Precautions for heating: 1, overheating, affecting quality. If milk is heated by microwave oven for a long time, protein in milk will change from sol state to gel state under the action of high temperature, which will lead to the appearance of sediment and affect the quality of dairy products. The longer the milk is heated, the higher the temperature, and the more serious the nutrient loss, among which vitamin C is the most serious, followed by lactose. 2. Avoid heating and preserve nutrition. Professionals also made it clear that putting bagged milk directly into the microwave oven will have a negative impact on human health. If the packaging material is not marked with the words "can be heated by microwave oven", it is not suitable for direct heating by microwave oven.