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Magnesium hydroxide in the pulp and paper industry

Magnesium hydroxide in the pulp and paper industry

BleachMag® protects cellulose and fibers in mechanical pulp peroxide bleaching and in delignification during chemical pulp bleaching. BleachMag is a new and efficient reagent based on natural magnesium hydroxide Mg(OH)2. It effectively replaces soda ash Na2CO3, caustic soda NaOH, caustic magnesia MgO, sodium silicate Na2SiO3 and magnesium sulfate MgSO4. BleachMag improves efficiency as well as product quality and reduces process costs.

Economic savings Production advantages Environment benefits
  • Lower bleaching cost
  • Lower waste water treatment cost
  • Higher pulp yield
  • BleachMag® acts as alkali and magnesium source
  • The liquor preparation and the process itself becomes simpler
  • The pH in pulping remains more stable
  • Drastic reduction of oxalate scaling
  • Improved settling properties of the waste water sludge
  • Reduced TOC, COD and BOD.
  • Safe and easy storage and use
  • Lower chlorine content of BleachMag compared to competitors

BleachMag requires no major changes or investments at the pulp, paper, or board mill. Russian Mining Chemical Company, RMCC, provides BleachMag as a powder or a 50 % stabilized aqueous dispersion.

Chemical pulping

BleachMag® can be used in sulphite and bisulphate pulping to replace both caustic magnesite, and soda ash or lime. The replacement of soda ash with BleachMag powder reduces the consumption of chemicals some 30 %.

Chemical pulp bleaching

BleachMag® reacts as an alkali source and cellulose protector in chemical pulp bleaching. BleachMag slurry contains both hydroxyl ions OH- and magnesium ions Mg2+, so it can replace magnesium sulfate MgSO4, and substitute partially caustic soda NaOH, in chemical pulp bleaching. It has been proved in laboratory and mill that BleachMag slurry is a cost effective option.

Mechanical pulp bleaching

In bleaching of mechanical pulps, BleachMag® reacts as a stabilizer and an alkali agent. BleachMag is a cost effective alternative to caustic soda and sodium silicate. BleachMag can be used in all GW, PGW, RMP, TMP, and CTMP high yield mechanical pulp mills. BleachMag slurry can also improve pulp strength and paper machine retention.

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Contact us, our experts will provide you with advice on the use of the product

+7 495 789 65 30 sales@magminerals.ru