摘要
为了有效地利用电石渣资源,研究用电石渣为原料制备球形、板状形、针叶形碳酸钙.利用DTA-TG、SEM等研究了电石渣的预处理方式对碳酸钙纯度的影响和碳化反应温度、CO2流量等对多晶型碳酸钙形成的影响.结果表明:电石渣可直接与氯化铵反应,当pH>7时,合成的碳酸钙的纯度大于97%,白度大于98.电石渣经过处理后,在不同的碳化反应温度及合适的CO2流量的条件下分别可以得到球形、板状形、针叶形的碳酸钙.
To recycle calcium carbide residue effectively, calcium carbide of different crystal form, including global aragonite, calcite and acicular calcium carbide was synthesized. Both the influence of pretreatment in the purity of calcium carbide, and the influence of temperatures of carbonization reaction, release velocity of carbon dioxide in the apparition of calcium carbide of different crystal form were studied with DTA-TG and SEM. The result shows that calcium carbide residue can take place chemistry reaction with ammonia chlorinate straight. Under the condition that pH was above 7, the purity of calcium carbide was above 97 %, and the whiteness was above 98. Once provided the different temperatures of carbonization reaction and the proper release velocity of carbon dioxide, global aragonite, calcite and acicular calcium carbide were obtained.
出处
《环境科学》
EI
CAS
CSCD
北大核心
2006年第4期775-778,共4页
Environmental Science
基金
国家高技术研究发展计划(863)项目(2003AA333030)
四川省重点学科建设基金资助项目
四川省科学基金资助(041100)
关键词
电石渣
多晶形碳酸钙
预处理
calcium carbide residue
calcium carbide of different crystal formation
pretreatment
