锂渣作为造纸填料的可行性探讨

Feasibility Study of Lithium Slag as Filler in Papermaking

关键词:  锂渣  造纸填料  抗张指数  撕裂指数

Key Words:lithium slag  papermaking filler  tensile index  tearing index

摘要:本研究分析了2种锂渣的理化性能，探究了锂渣含量对纸张性能的影响。结果表明，锂渣微观形貌呈不规则的块状，具有较大内表面积的多孔结构，粒径较大且分布范围较广。1^#锂渣与2^#锂渣的白度分别为66.4%和76.5%，加填会降低纸张白度。锂渣加填纸的强度性能优于沉淀碳酸钙加填纸。填料含量为18%时，1^#锂渣加填纸的抗张指数较沉淀碳酸钙加填纸提高了38%。填料含量为12%时，2^#锂渣加填纸的撕裂指数较沉淀碳酸钙加填纸提高了41%。此外，2^#锂渣加填纸的防水性能与沉淀碳酸钙加填纸相当，可以满足纸张防水性的要求。因此，锂渣可应用于对白度要求较低的包装纸中。

Abstract:The physical and chemical properties of two types of lithium slag were investigated， and the effect of lithium slag content on paper properties was explored. The results showed that the micro-morphology of lithium slag was irregular gravel-like， with a large internal surface area of the porous structure. The particle size of lithium slag was large and widely distributed. The brightness of 1^# lithium slag and 2^# lithium slag was 66.4% and 76.5%， respectively. The brightness of the paper was reduced after filling the lithium slag. The strength performance of the paper filled with lithium slag was better than the paper filled with PCC. At 18 wt% filler content， the tensile index of the paper filled with 1^# lithium slag was 38% higher than that of the paper filled with PCC. At 12 wt% filler content， the tear index of the paper filled with 2^# lithium slag was 41% higher than that of the paper filled with PCC. In addition， the water resistance of the paper filled with 2^# lithium slag was comparable to that of the paper filled with PCC， which could meet the requirements of water resistance of paper. Therefore， lithium slag could be used in packaging paper with lower whiteness requirements.