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| Forming Process and Mechanism of Interferent from DCS and Calcium Ions in Wet End System of Paper Machine |
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| DOI：10.11981/j.issn.1000-6842.2016.02.11 |
| Key Words:dissolved and colloidal substance； calcium ion； pitch interferent； deposition； aggregation process and mechanism |
| Fund Project:国家自然科学基金项目(31270614)；江苏省高校优势学科建设项目(PAPD)。 |
| Author Name | Affiliation | | 陈 晨 | 南京林业大学江苏省制浆造纸科学与技术重点实验室,江苏南京, 210037 | | 徐 辉 | 南京林业大学江苏省制浆造纸科学与技术重点实验室,江苏南京, 210037 | | 苏文鹏 | 南京林业大学江苏省制浆造纸科学与技术重点实验室,江苏南京, 210037 | | 戴红旗* | 南京林业大学江苏省制浆造纸科学与技术重点实验室,江苏南京, 210037 |
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| Abstract: |
| In this study, the mixture of sodium resinate and sodium stearate in the ratio of 1∶1 in mass was used to simulate the colloidal substances (CS), and the mixture of sodium resinate, sodium stearate and sodium polyacrylate in the ratio of 1∶1∶1 in mass were used to simulate the dissolved and colloidal substances (DCS) existed in white water of papermaking wet end system. The forming process and mechanism of insoluble interferent from soluble substances CS and DCS in the existing of calcium ions was investigated by measurement of turbidity, zeta potential, particle size distribution and morphological observation of the simulated materials before and after reacting with Ca2+. The results showed that the micelles with hydrophilic groups in the sheath were formed when CS accumulated to a certain concentration in white water, the insoluble pitch interferent with high viscosity could be produced by particle-particle collision after micelles reacting with Ca2+; the micelles could also react with hydrophilic groups of CS, after they reacted with Ca2+ to form larger colloids with hydrophobic groups extending in the water, and then adsorbed other hydrophobic groups of CS due to similar polarity, and pitch interferent with large size was produced by “layer by layer” adsorption. Sodium polyacrylate could react with Ca2+ and cause deposition, while sodium polyacrylate could stabilize the pitch to a certain degree by steric stabilization. Reducing the content of DCS in white water and controlling the calcium ions concentration under 5 mmol/L could minimize the pitch deposition． |
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