一般坎离砂只能用4—5次,我们采用下列办法处理后,使用次数已增加到12—15次。根据坎离砂加醋产热的道理看来,我们认为其失效的原因,可能是加醋后起化学反应,使坎离砂表面氧化,氧化物逐渐增厚起来,再加醋时,醋液就不易渗入与有效成分接触,即使接触,产生的热被氧化层所阻也不易放出,因而失 Generally, the sand can only be used 4-5 times, we use the following method to deal with, the number of uses has been increased to 12-15 times. According to the truth from the desert hot vinegar heat, it seems that the reason for its failure may be chemical reaction after vinegar, so that the ridge from the surface oxidation of the sand, the oxide gradually thickening, when coupled with vinegar It is difficult to infiltrate into contact with the active ingredients, even if the contact, the heat generated by the oxide layer of the resistance is not easy to release, so the loss