河砂具有熔点高，热储量大，性质稳定等特点，将河砂用于石蜡裂化实验，可收到意想不到的效果。其方法是：1．将河砂用稀盐酸酸洗，再用水冲洗干净，烘干，备用。2.在具支大试管里装入约25g干河砂。3.垫上石棉网用大火加热3～5min，让河砂蓄热升温至500℃以上。4．立即投入约58 River sand has the characteristics of high melting point, large heat reserves, stable properties, etc. The use of river sand for paraffin cracking experiments can have unexpected effects. The method is: 1. The river sand is washed with dilute hydrochloric acid, rinsed with water, dried and set aside. 2. Load about 25 g dry river sand in a large test tube. 3. Asbestos mat is heated with a fire for 3 to 5 minutes to allow the river sand to heat up to more than 500°C. 4. Immediate investment of about 58