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一、低品位石膏的涵义我国天然石膏质量标准是在1960年由建工部以(60)建陈非字第四号文颁发的,JG16—60石膏质量标准以CaSO_4·2H_2O(Tg)百分含量为依据,其等级划分如下:等级CaSO_4·2H_2O(Tg)%1 Tg≥95%2 95%>Tg≥85%3 85%>Tg≥75%4 75%>Tg≥65%部颁标准对开采天然石膏的最低品位要求,原则上规定单层开采的石膏Tg≥65%,在开采品位不同的几个膏层所组成的一个膏组时,其中每一膏层的CaSO_4·2H_2O 最低品位不得少于45%(边界品位)。但品位中和后的
First, the meaning of low-grade gypsum China’s natural gypsum quality standards in 1960 by the Construction and Construction Department to build (60) Chen Fei word No. issued four, JG16-60 gypsum quality standards to CaSO 4 · 2H 2 O (Tg) percentage Level, the grades are as follows: Grade CaSO 4 · 2H 2 O (Tg)% 1 Tg ≥ 95% 2 95%> Tg ≥ 85% 3 85%> Tg ≥ 75% 4 75%> Tg ≥ 65% Mining the lowest grade of natural gypsum requirements, in principle, the provisions of a single gypsum mining Tg ≥ 65%, in the exploitation of different grades of a paste consisting of a cream group, where each cream layer CaSO 4 · 2H 2 O minimum grade not Less than 45% (border grade). But after the grade and