RECLAIMING PULP FROM WASTE PAPERS BY TREATING WITH A SOLUTION OF SODIUM HYDROXIDE, SODIUM CARBONATE, SODIUM OR AMMONIUM BICARBONATE, AND SODIUM BORATE

摘要

The reclamation of purified and reusable pulps from various types of waste papers by first shredding the paper into fine pieces, boiling the shredded paper in a chemical solution containing an alkali metal hydroxide, an alkali metal carbonate an alkali metal bicarbonate and sodium borate, water washing the chemicals from the cooked paper and then bleaching the pulp with a chemical bleach at elevated temperature. The chemicals in the solution are believed to react to form sodium borocarbonate as a reactive compound.