摘要
以废弃硅藻土为原料,采用硫酸酸浸除杂、氢氧化钠合成硅酸钠、硫酸酸化,再经清洗、干燥等步骤,制得白炭黑。考察了不同因素对制备效果的影响。实验结果表明,酸浸最佳工艺条件为:硫酸质量分数17%,酸浸温度40℃,液固比(硫酸溶液与废弃硅藻土的质量比)3.0∶1;碱处理最佳工艺条件为:碱加入量(氢氧化钠与酸浸后硅藻土的质量比)0.4,碱处理时间60min。在此条件下制备出的白炭黑的总产率可达46.7%,产品质量符合HGT3061—1999《橡胶配合剂沉淀水合二氧化硅技术条件》中的D类标准,可实现废弃硅藻土的资源化利用。
White carbon was prepared from waste diatomite via impurities-removing with sulfuric acid leaching, sodium silicate synthesis with sodium hydroxide, acidification with sulfuric acid, washing and drying, etc. The factors affecting the preparation were studied. The optimum conditions for acid leaching are as follows： sulfuric acid mass fraction 17%, acid leaching temperature 40 ~C and mass ratio of sulfuric acid to waste diatomite 3.0： 1 ; The optimum conditions for alkaline treatment are as follows： mass ratio of sodium hydroxide to waste diatomite 0.4, alkaline treatment time 60 min. Under these conductions, the total yield of white carbon is 46.72%. The product quality can meet the D grade standard of HGT3061 - 1999. This technology can achieve the reuse of waste diatomite.
出处
《化工环保》
CAS
CSCD
北大核心
2009年第1期54-57,共4页
Environmental Protection of Chemical Industry
关键词
硅藻土
固体废物
白炭黑
硅酸钠
水合二氧化硅
综合利用
diatomite
solid waste
white carbon
sodium silicate
hydrous silicon dioxide
comprehensive utilization
