A method for treating anthraquinone spent sulfuric acid
The combined reaction of calcium carbonate and ferrous sulfate with hydrogen peroxide to produce calcium sulfate dihydrate solves the problems of high treatment cost and difficulty in resource utilization of anthraquinone waste sulfuric acid, achieving efficient resource utilization and purification effect.
CN118579922BActive Publication Date: 2026-07-24LIMING RES INST OF CHEM IND
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Patent Information
- Application Number
- CN202410678841.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-29
- Publication Date
- 2026-07-24
- Estimated Expiration
- 2044-05-29
AI Technical Summary
Technical Problem
Existing methods for treating anthraquinone waste sulfuric acid are costly, time-consuming, require secondary treatment of the purified wastewater, and produce poor-quality products, making it difficult to achieve resource utilization.
Method used
A combination of calcium carbonate, ferrous sulfate, and hydrogen peroxide is used to generate calcium sulfate dihydrate through a reaction. The heat from the reaction is used to decompose organic impurities. The pH is then adjusted and flocculation and precipitation are carried out to achieve filtrate reuse.
Benefits of technology
This method enables the preparation of high-quality calcium sulfate dihydrate, reduces processing costs, decreases emissions of waste, simplifies the process, and improves processing efficiency.
✦ Generated by Eureka AI based on patent content.
Abstract
The application discloses a treatment method of anthraquinone waste sulfuric acid, and comprises the following steps: (1) adding calcium carbonate and ferrous sulfate into a reactor, adding water and stirring uniformly; (2) adding anthraquinone waste sulfuric acid and hydrogen peroxide aqueous solution into the reactor in step (1), continuing to stir for a certain time after dropping is completed; (3) filtering and separating the mixture after reaction in step (2), obtaining calcium sulfate dihydrate solid and water phase, and returning the water phase into the reactor; (4) adding calcium hydroxide into the reactor, stirring uniformly, adding a flocculating agent after adjusting pH, and stirring and flocculating; filtering and separating, and obtaining filter cake and filtrate. The treatment method can react the anthraquinone waste sulfuric acid with calcium carbonate to prepare calcium sulfate dihydrate. The heat released in the reaction is used to decompose organic impurities in the waste sulfuric acid by hydrogen peroxide and ferrous sulfate, one-step purification and utilization of the anthraquinone waste sulfuric acid is realized, the filtrate after reaction can be reused, the discharge of three wastes is reduced, the treatment time and cost of the anthraquinone waste sulfuric acid are reduced, and the anthraquinone waste sulfuric acid is used in a resourceful and productized way.
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