Abstract
A deinking process is based on two fundamental operations: defibering and deinking. Defibering depends on added chemicals and shear stress applied to a wastepaper suspension. The defibering operation and the added chemicals control ink removal. In this study disintegration stock concentration, rotor speed and disintegration time are used to optimise defibering to a Somerville index less than 0.01%. Higher stock concentrations always represent minimum specific energy consumption (SEC) due to shear and acceleration effects. The effect of cationic surfactant and addition points of chemicals are evaluated. When cationic surfactant is used to enhance ink removal the best performance is achieved with disintegration at basic pH and flotation at neutral pH. The addition of cationic surfactant in the flotation step is beneficial as it minimises ink dispersion.
| Original language | English |
|---|---|
| Pages (from-to) | 351+354+358 |
| Journal | Appita Journal |
| Volume | 56 |
| Issue number | 5 |
| Publication status | Published - Sept 2003 |
UN SDGs
This output contributes to the following UN Sustainable Development Goals (SDGs)
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SDG 7 Affordable and Clean Energy
Keywords
- Cationic surfactant
- Disintegration pH
- Flotation efficiency
- Hydrogen peroxide
- Sodium hydroxide
- Specific energy consumption
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