从烟道灰制备饲料级氧化锌  

Preparation of feed grade zinc oxide from flue dust

作　　者：田伟军[1] 赵志雄[1] 

机构地区：[1]湖南化工职业技术学院化工系,湖南株洲412004

出　　处：《无机盐工业》2008年第6期50-52,共3页Inorganic Chemicals Industry

摘　　要：研究了以含氯烟道灰为原料,经酸浸、除杂、合成制得中间产物碱式碳酸锌,碱式碳酸锌经过滤、洗涤、干燥、煅烧制备饲料级氧化锌的新工艺。重点考察了制备工艺中酸浸、除杂条件以及煅烧温度和时间对产品质量的影响。结果表明:采用质量分数为30%的硫酸浸取,可使锌浸出率达到95%;采用质量分数为27.5%的过氧化氢溶液氧化除铁和锌粉两段置换可彻底除杂;控制煅烧温度800℃,煅烧时间4 h,可制备氧化锌质量分数达到98%的饲料级氧化锌产品。该方法利用了廉价的烟道灰,具有原料来源广泛、生产成本低的优势,制备的产品质量可达到HG/T 2792—1996饲料级氧化锌一等品标准。A new technology for the preparation of feed grade zinc oxide from chlorine - containing flue dust was studied. The process uses chlorine - containing flue dust as raw material, which was synthesized into intermediate product basic zinc carbonate after acid - leaching and purifying. Then feed grade zinc oxide was prepared from basic zinc carbonate through filtrating, washing, drying and calcination. The effects of acid -leaching and impurity -removing conditions as well as the calcining temperature and time on product quality were primarily investigated. Results showed that ： the zinc leaching rate can reach 95% while adopting 30% （mass fraction） sulfuric acid;the impurities can be completely removed by 27.5 % hydrogen peroxide solution oxidizing Fe and two - stage zinc powder displacement method;feed grade zinc oxide with mass fraction of 98% can be prepared by controlling calcining temperature at 800 ℃ for 4 h. This method uses cheap flue dust as raw material. Therefore, it has the advantages of extensive raw material resource and low cost. In addition,the prepared products can meet the standard of HG/T 2792-1996 （first grade）.

关 键 词：烟道灰 饲料级氧化锌 碱式碳酸锌 

分 类 号：TQ134.41[化学工程—无机化工]