| 摘要 |
The present invention relates to a method for cleansing resin-contaminated liquors in paper-pulp manufacturing processes, in which method there is added to a resin-contaminated liquor a floc-promoting metal salt, such as aluminium sulphate, in at least a stoichiometric quantity against ingoing resin, therewith to flocculate the resins present, whereafter there is added an alkali to obtain a pH of 5-6. Subsequent hereto, there is optionally added a flocculating agent in the form of an organic polyelectrolyte. The resultant flocs are then isolated and, optionally after being dewatered to elevate the dry solids content, are reacted with an inorganic acid, such as sulphuric acid, at pH 1-2 and cleaved at a temperature of at least 70 DEG C, whereafter the resultant cleaved resin product is isolated per se and the resultant solution containing cleaved metal salts, such as an aluminium sulphate solution, is isolated per se and, optionally, is then re-cycled or re-used as a flocculating agent. The resultant resin product can be burned as a fuel and/or further refined. |
