摘要
造纸白泥是一种以碳酸钙为主且含有熟石灰的固体废弃物。因含水率较高,脱水困难,后续处理成本增加。采用氯化铵法及碳化法对竹浆造纸白泥处理后不仅脱水容易,而且制得了较纯的碳酸钙,使其能够得到合理利用。以固液比、氯化铵用量及CO_2通气速率为因素对碳酸钙制备的条件进行了探究,并利用XRD、SEM对所制备碳酸钙进行分析。结果表明,白泥经处理后碳酸钙含量及白度均有所提高。氯化铵法的最佳条件为:固液比为0.125 g/m L,氯化铵用量为白泥质量的25.68%;碳化法最佳条件为:固液比为0.125 g/m L,CO_2通气速率为0.144 L/(h·g白泥)。相比之下,碳化法处理工艺简单,用水量少,无废水排放。
Lime mud from the papermaking process （LMP） is a solid waste which contains calcium carbonate and a small amount of hydrated lime. So the subsequent processing costs increased as the high moisture content and dehydration difficulties. This paper adopts method of ammonium chloride and method of carbonation for processing of bamboo LMP, after the process, the dehydration is easy, and the pure calcium carbonate is made, so that it can be used reasonably. The conditions for the preparation of calcium carbonate were studied by considering the factors including the ratio of solid to liquid, the dosage of ammonium chloride and CO2 ventilation rate, and the calcium carbonate was analyzed by XRD and SEM. The results showed that the content of calcium carbonate and the whiteness of the treated LMP were increased. The best conditions for the method of ammonium chloride： the ratio of solid to liquid was 0.125 g/mL, the amount of ammonium chloride was 25.68% of LMP; The best conditions for the method of carbonation： the ratio of solid to liquid was 0.125 g/mL, CO2 ventilation rate was 0.144 L/（h·g LMP）. In contrast, the carbonization process is simple, with little water and no waste water discharge.
出处
《非金属矿》
CAS
CSCD
北大核心
2017年第2期94-98,共5页
Non-Metallic Mines
基金
西南科技大学大学生创新基金(CX15-075)
关键词
造纸白泥
氯化铵
碳化
脱水
碳酸钙
lime mud from papermaking process
ammonium chloride
carbonization
dehydration
calcium carbonate
