棕刚玉砂熔样方法的改进洪元泮棕刚玉砂化学成份的测定，目前按国标ＧＢ３０４３—８９进行。该标准方法规定试样制备要“用刚玉研钵研细至全部通过１００号筛”。这是考虑到棕刚玉很硬，制样困难，故不象其它矿产品，要求通过２００目筛，但又要照顾到熔样，才定为全部通... The improvement of brown corundum sand melting sample method The determination of the chemical composition of brown corundum sand produced by Hong Yuanyu is currently carried out according to the national standard GB3043-89. The standard method stipulates that the preparation of the sample is to be “finely ground with a corundum mortar until all passes through the No. 100 sieve.” This is due to the fact that brown corundum is very hard and sample preparation is difficult. Therefore, unlike other mineral products, it is required to pass a 200-mesh sieve, but it is necessary to take care of the melting sample.