摘要
研究了利用废石膏制备硫脲的新方法,通过废石膏炭化焙烧制备硫化钙、碳酸化浸取制备硫氢化钙、硫氢化钙与石灰氮湿法反应制备硫脲。该工艺省却了传统硫脲合成过程中硫化氢制备环节。同时,考察了废石膏炭化焙烧的反应条件对硫化钙产出率影响的规律,提出废石膏高效利用的优化条件为:按废石膏与炭的质量比为1∶2.5,管式炉中920℃条件下焙烧2.5 h,废石膏还原为硫化钙的转化率达95%,进一步合成的硫脲纯度达92%。
Thiourea is synthesized by using waste gypsum and calcium cyanamide as raw mterials, through the process of carbonization roasting, leaching of acid, synthesis process, the sulfur of waste gypsum is transformed into thiourea. By investigating the influence of reaction conditions, the optimal conditions of roasting waste gypsum was put forward： mixing waste gypsum and carbon by the mass ratio of 1：2.5, calcining the mixture in furnace at 920 ℃ for 2. 5 h. On that condition, the conversion rate of waste gypsum can reach to 95% and the purity of the final product of thiourea reached 92%.
出处
《化工设计通讯》
CAS
2011年第4期80-83,86,共5页
Chemical Engineering Design Communications
关键词
废石膏
硫化钙
硫脲
制备
表征
waste gypsum
calcium sulfide
thiourea
preparation
characteristic
