摘要
研究了以微硅粉碱性焙烧-熟料浸出-溶液净化-碳分沉淀-洗涤-干燥-煅烧工艺制取白炭黑。将微硅粉与纯碱混合均匀，在850℃下焙烧1 h制成偏硅酸钠熟料；熟料水浸得偏硅酸钠溶液；偏硅酸钠溶液在水浴温度70℃下，用石灰粉搅拌净化1 h除杂，净化液中杂质Fe脱除率为94％，Al脱除率为56％，SiO2损失率为19％；净化液用CO2碳分沉淀，控制温度50～60℃，CO2流量与空气流量比为1∶7～1∶7．5，碳分时间3～4h，获得颗粒均匀的偏硅酸沉淀；偏硅酸经盐酸及蒸馏水洗涤后干燥煅烧得高纯白炭黑，白炭黑纯度在99．98％以上。此工艺原料易得，过程控制简单，不产生污染，可实现工业微硅粉的高值化利用。
Preparation of high-purity silica white by micro-silica powder roasting with alkaline clinker -leaching using water -solution purification -carbon dioxide decomposition -washing -calcination has been researched .The mixture of micro-silica powder with soda was roasted at 850 ℃ for 1 hour to prepare sodium metasilicate clinker .The clinker was leached with water at temperature of 70 ℃ ,then the impurity（Al ,Fe） in the leaching solution was removed with lime powder .Removal rate of Fe is 94% ,removal rate of Al is 56% ,the loss rate of SiO2 is 19% .The purified solution was carbon decomposition for 3-4 hours using CO2 to precipitate acid metasilicate at temperature of 50-60 ℃ , CO2 flow and air flow ratio of 1∶7 .0 -1∶7 .5 .The precipitated acid metasilicate was washed using hydrochloric acid and distilled water ,then was dried and calcined to obtain high-purity silica white with SiO2 grade over 99 .98% .For process ,the raw materials are readily available ,process is simple , no-pollution ,industrial silica powder can be fully used with high value .
出处
《湿法冶金》
CAS
北大核心
2014年第5期406-409,共4页
Hydrometallurgy of China
关键词
微硅粉
焙烧
浸出
洗涤
煅烧碳分
高纯白炭黑
micro-silica powder
roasting
leaching
washing
calcining
carbon decomposition
silica w hite
