本文選題：天然石膏 + 水熱法�。� 參考：《礦產(chǎn)保護與利用》2017年06期

【摘要】：以天然石膏為原料采用水熱法制備半水硫酸鈣晶須,SEM觀察晶須形貌及分析長徑比�？疾炝送饧觿�、原料粒度、水熱溫度、pH值、初始料漿濃度、水熱時間對硫酸鈣晶須形貌影響。結果表明:外加劑提高了天然石膏在水中的溶解度;原料粒度會影響天然石膏的溶解速率,粒度越小溶液越容易達到過飽和狀態(tài);水熱溫度在100℃時較難生成硫酸鈣晶須;溶液pH值可改變?nèi)芤弘x子質(zhì)量分數(shù),隨著pH值升高晶須平均直徑逐漸減小,同時會導致外加劑失效;料漿濃度越高,晶須生長空間越小,溶液體系離子遷移速度降低。在原料粒度4μm、料漿濃度5%、CuCl_21.5%(相對于天然石膏質(zhì)量)、水熱溫度120℃、pH=5.3、水熱時間140 min的條件下,制備出平均直徑1~2μm、長徑比達160的半水硫酸鈣晶須。
[Abstract]:Using natural gypsum as raw material, calcium sulfate semidihydrate whisker was prepared by hydrothermal method. SEM was used to observe the morphology of whisker and to analyze the aspect ratio. The effects of additives, particle size of raw materials, hydrothermal temperature and pH value, initial slurry concentration and hydrothermal time on the morphology of calcium sulfate whisker were investigated. The results show that the solubility of natural gypsum in water is improved by admixture, the dissolution rate of natural gypsum is affected by the particle size of raw material, the smaller the particle size is, the more easily the solution is supersaturated, the calcium sulfate whisker is difficult to be formed at the hydrothermal temperature of 100 鈩，

本文編號：1903297