Device for preparing ammonium sulfate and calcium carbonate through phosphogypsum ammonification

CN223159238UActive Publication Date: 2025-07-29HUBEI SANNING CHEM
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Patent Information

Application Number
CN202422370566.5
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-09-27
Publication Date
2025-07-29
Estimated Expiration
2034-09-27

AI Technical Summary

Technical Problem

The arbitrary accumulation and emission of phosphogypsum restricts the sustainable development of industries such as wet phosphoric acid and phosphate fertilizer. The composition of phosphogypsum is complex, and its structure is different from that of natural gypsum, making it difficult to effectively utilize.

Method used

Calcium carbonate slurry was prepared by adding phosphogypsum and ammonium carbonate water at 40°C to prepare a calcium carbonate slurry, and calcium carbonate filter slag and ammonium sulfide filtrate were obtained by flash evaporating. Ammonium carbonate liquid was decomposed into carbon dioxide and ammonia escaped, and water was recycled. The equipment was made of fiberglass and recycled filtrate.

Benefits of technology

It has achieved efficient preparation of ammonium sulfide and calcium carbonate, with high product yields, low equipment requirements, environmental protection and no "three wastes" generation, reducing the cost of hazardous waste treatment and meeting the conditions for industrialization.

✦ Generated by Eureka AI based on patent content.

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Abstract

The utility model relates to a device for preparing ammonium sulfate and calcium carbonate by phosphogypsum ammoniation, which comprises a reaction tank, the reaction tank is provided with a phosphogypsum feed pump and an ammonium bicarbonate feed pump, the reaction tank is communicated with a calcium carbonate plate-and-frame filter press through a pipeline, a liquid outlet of the calcium carbonate plate-and-frame filter press is communicated with an ammonium sulfate buffer tank through a pipeline, and the ammonium sulfate buffer tank is communicated with an ammonium carbonate buffer tank through a pipeline. A discharge port of the ammonium sulfate buffer tank is communicated with a feed port in the middle of the ammonium bicarbonate evaporation tower, a gas-phase pipeline at the upper part of the ammonium bicarbonate evaporation tower is connected with a feed port of the ammonium bicarbonate buffer tank through the ammonia recovery tank, and a discharge port of the ammonium bicarbonate buffer tank is connected with a feed port in the upper part of the ammonium bicarbonate evaporation tower. According to the utility model, phosphogypsum and ammonium bicarbonate react to obtain poly calcium carbonate slurry, and filter-pressed filtrate is evaporated to obtain ammonium bicarbonate for recycling. The method does not involve high-temperature, high-pressure and high-cost raw materials, has lower requirements on equipment, and has industrial conditions due to circulating operation of the system.
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