砂中云母含量的多少,对混凝土的强度和耐冻性有很大关系。以往在材料试验中无法测定,书中所介绍的氯化锌测定云母方法,经试验无效。后来用碘汞化钾络盐溶液方法及根据碘化汞能溶于过量碘化钾中的化学原理,重新配方建立了配药浮选云母,检选和鉴定云母及 The amount of mica in the sand has a great influence on the strength and frost resistance of the concrete. In the past, it could not be determined in material tests. The mica method for measuring zinc chloride introduced in the book was invalid after tests. Later, with the method of iodine-mercury-potassium complex salt solution and the chemical principle that mercury iodide can be dissolved in excessive potassium iodide, a formula was formulated for the preparation of pharmacy flotation mica, and mica was selected and identified.