Preparation of Neutral Paper Filler from Sludge Generated from Treating Color Loss Wastewater with Calcium Chloride and Calcium Nitrate

摘要

The present invention is to dissolve the sludge generated when hydrolyzing limestone powder or calcium carbide to synthesize acetylene gas with hydrochloric acid and nitric acid to obtain an aqueous solution of calcium chloride and calcium nitrate, respectively, or to dissolve the industrial calcium nitrate crystal in water calcium nitrate aqueous solution You can also make;In this way, the dye loss wastewater is purified with calcium chloride or calcium nitrate aqueous solution, and a high purity sludge composed of CT (calcium terephthalate) and calcium carbonate (CaCO ₃ ) is synthesized in this process and subsequent processes to make it a neutral paper filler. Treat the dyeing loss wastewater with calcium nitrate (aqueous solution) or calcium chloride (aqueous solution), and pass the CO ₂ gas through the sludge obtained in this process to synthesize a mixture of calcium terephthalate (CT) and calcium carbonate (CaCO ₃ ) It is about a method.