【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。更多还原

【Abstract】 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 ℃ 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.更多还原