添加无机盐化合物对MOW脱墨体系胶体特性及脱墨浆质量的影响

本文介绍了在混合办公废纸（MOW）脱墨过程中添加几种无机金属盐来改变脱墨分散体系的胶体特性（用Zeta电位、接触角、吸光率、透射率等参数来表征），进一步探讨了胶体化学环境的变化与脱墨浆残余油墨量及白度值的关系。结果表明：添加一定量的无机金属盐后取得了适宜的胶体化学环境，这对脱墨分散体系中油墨粒子的脱除有着积极的促进作用，三种无机金属盐对脱墨浆残余油墨量和白度的影响程度依次为MgCl2〉Al2（SO4）]〉CaCl2。其中，添加氯化镁（2．0％）时残余油墨量减少了67．37％，白度增加了4．9％。

Effect of Adding Inorganic Salt Compounds on Colloid Chemistry Characteristic and Deinking Efficiency of MOW

In this paper,some inorganic salt compounds,including CaCl2,Al2(SO4)3 and MgCl2,are used to optimize the deinking process of MOW.The main colloid characteristic parameters of deinking system,for example zeta potential,contact angle,absorbance and transparence,are measured,and the relationship of the colloid characteristic parameters with the adding dosage of the inorganic salt compounds was discussed.The results showed that an ideal deinking efficiency can be obtained by adding some feasible inorganic salt compound into the deinking system.Among three inorganic salt compounds,the influence sequence to the deinking result is MgCl2>Al2(SO4)3>CaCl2.With an adding 2% of MgCl2,the brightness of the deinked pulp can be increased 4.9%,and the residual ink particle content of the deinked pulp is reduced by 67.37%.