Method of producing recycled hardened materials using waste gypsum
AssigneeJong-Won Park
InventorJong-Won Park
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Abstract
Disclosed herein is a method for producing a recycled hardened material using waste gypsum. The method comprises treating acidic wastewater generated in the production of copper, zinc or titanium or the production of sodium hydroxide (caustic soda) and chlorine using saline water, with calcium hydroxide (slaked lime), so as to precipitate sludge, and mixing the precipitated sludge with pulp sludge ashes having pozzolanic properties.
Claims8
A method for producing a recycled hardened material using waste gypsum, comprising adding pulp sludge ashes and water to waste gypsum generated from the treatment of acidic wastewater with calcium hydroxide, thereby obtaining a hardened material rapidly, wherein the mixing ratio between the pulp sludge ashes, the waste gypsum and the water is 50-65 wt %:
- 10-25 wt %:
- 10-40 wt %.
A method for producing a recycled hardened material using waste gypsum, the method comprising the steps of:
- dehydrating sludge generated from the treatment of acidic wastewater or saline water by means of a filter press so as to form waste gypsum having a water content of 60-80%;
- adding water to the waste gypsum at a ratio of 1 (waste gypsum):
- 1-1.6 (water) so as to prepare slurry;
- and
- mixing the slurry with dry pulp sludge ashes.
Dependencies are inferred from the claim text.