CellGuard® Magnesium Hydroxide:
Paper and Pulp Bleaching
Effectively replaces caustic soda, sodium silicate and magnesium sulfate
Martin Marietta’s CellGuard magnesium hydroxide functions as a cellulose protector and an alkali in mechanical pulp peroxide bleach systems, as well as the oxygen delignification and extraction stages of chemical pulp bleaching. CellGuard has multiple applications in pulp bleaching and provides the following benefits:
| Mechanical Pulp Bleaching | Chemical Pulp Bleaching |
| Significantly lowers bleach chemical costs by eliminating or reducing caustic soda and sodium silicate usage and by yielding higher residual peroxide for potential reuse | Reduces chemical costs by eliminating magnesium sulfate usage in oxygen delignification and extraction stage bleaching |
| Reduces potential for silicate scaling and oxalate scaling | Lowers caustic soda usage in oxygen delignification and extraction stage bleaching |
| Lowers BOD/COD up to 40% | Maintains brightness and physical properties |
| Improves pulp yield as indicated by BOD/COD reduction | |
| Reduces anionic trash as measured by conductivity up to 40% | |
Maintains brightness and physical properties |
CellGuard OP
Concentrated aqueous suspension used as a cellulose protector in oxygen delignification systems, as an alkali source in mechanical pulp peroxide bleaching and as a partial substitute for caustic soda in EOP and EP bleaching.
CellGuard MH
A high purity powder used as a cellulose protector in oxygen delignification systems, an alkali source in mechanical pulp peroxide bleaching, and as a partial substitute for caustic soda in EOP and EP bleaching.
CellGuard OP as a Replacement for Caustic Soda in Mechanical Pulp Bleaching
Technical Bulletin
CellGuard OP as a Replacement for Caustic Soda in Chemical Pulp Bleaching
A case study featuring kraft softwood pulp.
