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首页> 外文期刊>Crystal Research and Technology: Journal of Experimental and Industrial Crystallography >Preparation of Large-Grained alpha-High Strength Gypsum with FGD Gypsum
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Preparation of Large-Grained alpha-High Strength Gypsum with FGD Gypsum

机译：用FGD石膏制备大颗粒α-高强度石膏

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摘要

Using FGD gypsum as the raw material, short columnar-shaped alpha-calcium sulfate hemihydrate can be prepared with succinic acid in hydrothermal autoclave method with a low salt content. The influence of washing times, slurry concentration, salt content, reaction temperature, pH and the amount of succinic acid were investigated. The research shows that: short columnar alpha-calcium sulfate hemihydrate with the length of 50 mu m and length-diameter ratio of 1, dry compressive strength of which is similar to 40 grade was obtained at the slurry concentration of 14%, salt content of 3%, succinic acid of 0.07% after three times washing under 115 degrees C without the change of pH value. After 5 times circulation of mother liquid, the morphology of the product had no significant difference with the initial product and recycling rate of sodium chloride was not less than 90%.
机译：使用FGD石膏作为原料，短柱状α-硫酸钙半水合物可以用琥珀酸在水热容高压釜方法中用低盐含量制备。 研究了洗涤时间，浆料浓度，盐含量，反应温度，pH和琥珀酸量的影响。 研究表明：短柱状α-硫酸钙半水合物，长度为50μm，长度直径比为1，在浆料浓度为14％，盐含量的浆料浓度下获得类似于40级的干压缩强度。 3％，琥珀酸在115摄氏度下洗涤3次后3％，没有pH值的变化。 在母液循环5次后，产品的形态与初始产物和氯化钠的回收率没有小于90％。

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