Resource recovery method and resource recovery system of desulfurized ash
AssigneesZhangjiagang Hongchang Steel Plate Co., Ltd., Hangsu Shagang Group Co., Ltd., Institute of Research of Iron and Steel, Jiangsu Province/Sha-Steel, Co., Ltd.
InventorsRui Mao, Shendong Mao, Fei Wang, Hang Su
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Abstract
A resource recovery method and a resource recovery system of desulfurized ash. The resource recovery method includes washing desulfurized ash with water, and performing solid-liquid separation to obtain solid residues rich in calcium sulfite and calcium sulfate and a solution rich in calcium hydroxide; preparing the solution into desulfurization slurry; and roasting the solid residues under the action of a reducing agent to obtain flue gas rich in sulfur dioxide and residues rich in calcium oxide. Therefore, the recovery of sulfur and calcium in the desulfurized ash is realized, and no solid waste, liquid waste, gas waste, etc. are produced in the process.
Claims9
A resource recovery method of desulfurized ash, comprising:
- a water washing process:
- washing desulfurized ash with water, a mass ratio of water to desulfurized ash is greater than 20:1, and performing solid-liquid separation to obtain solid residues rich in calcium sulfite and calcium sulfate and a solution rich in calcium hydroxide;
- a slurry preparation process:
- preparing the solution rich in calcium hydroxide into desulfurization slurry;
- and
- a roasting process:
- roasting the solid residues rich in calcium sulfite and calcium sulfate under the action of a reducing agent to obtain flue gas rich in sulfur dioxide and residues rich in calcium oxide.
Dependencies are inferred from the claim text.