金属离子及非硅稳定剂对化学机械浆漂白过程中过氧化氢稳定性的影响

Effect of Metal Ion and Non-silicon Stabilizer on the Stability of Hydrogen Peroxide in Chemi-mechanical Pulp Bleaching Process

关键词:  金属离子  非硅稳定剂  螯合值  残余H₂O₂含量  漂白效果

Key Words:metal ions  non-silicon stabilizer  chelate value  residual H₂O₂ content  bleaching effect

摘要:本研究主要探讨了Ca²⁺、Mg²⁺、Fe³⁺、Cu²⁺、Mn²⁺ 5种金属离子和6种非硅稳定剂对化学机械浆漂白过程中残余H₂O₂含量的影响。结果表明，Ca²⁺、Mg²⁺可以提高残余H₂O₂含量，Fe³⁺、Cu²⁺、Mn²⁺降低了残余H₂O₂含量，且降幅明显。非硅稳定剂中羟基亚乙基二膦酸（HEDP）的钙铁螯合值最大，钙螯合值为434.0 mg/g，铁螯合值为243.6 mg/g。当Mn²⁺质量浓度为1 mg/kg时，二乙烯三胺五亚甲基膦酸（DTPMP）在漂白过程中能够很好地抑制H₂O₂的无效分解，残余H₂O₂含量最高为4.0%，浆料白度最好为69.9%。

Abstract:The effects of five metal ions （Ca²⁺， Mg²⁺， Fe³⁺， Cu²⁺ ，and Mn²⁺） and six non-silicon stabilizers on residual H₂O₂ content in chemi-mechanical pulp bleaching process were studied. The results showed that Ca²⁺ and Mg²⁺ could increase the residual H₂O₂ content， while Fe³⁺，Cu²⁺， and Mn²⁺ reduced the residual H₂O₂ content significantly. The calcium and iron chelation values of hydroxyethyl diphosphonic acid （HEDP） were the highest in non-silicon stabilizer， with calcium chelation value of 434.0 mg/g and iron chelation value of 243.6 mg/g. Diethylenetriamine pentamethylene phosphonic acid （DTPMP） could effectively inhibit the ineffective decomposition of H₂O₂ in the bleaching process， the residual H₂O₂ content was up to 4.0%， and the whiteness of the pulp was 69.9%，when Mn²⁺ mass concentration was 1 mg/kg.