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Found results for
 patents
1.
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METHOD FOR PRODUCING SODIUM CARBONATE AND HIGH-STRENGTH GYPSUM BY USING CALCIUM CARBONATE AND SODIUM SULFATE AS RAW MATERIALS
| Application Number |
CN2024129633 |
| Publication Number |
2025/161570 |
| Status |
In Force |
| Filing Date |
2024-11-04 |
| Publication Date |
2025-08-07 |
| Owner |
- BEIJING COLUMBUS RECYCLING TECHNOLOGY CO., LTD. (China)
- INSTITUTE OF PROCESS ENGINEERING, CHINESE ACADEMY OF SCIENCES (China)
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| Inventor |
- Li, Haibo
- Cao, Shaotao
- Li, Ya
- Zhang, Yi
- Sheng, Yuxing
- Li, Baozhen
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Abstract
The present application discloses a method for producing sodium carbonate and high-strength gypsum by using calcium carbonate and sodium sulfate as raw materials. In the present application, two low-value-added salts, sodium sulfate and calcium carbonate, are used as raw materials, and are combined with an ammonia cycle to produce a high-value-added product, i.e., sodium bicarbonate or sodium carbonate, and high-strength gypsum; by means of a calcium-oxide-based deamination unit, full cycling of an ammonia raw material in a production process is realized; and by producing the high-strength gypsum, the economic efficiency of the process is improved. The method provided in the present application has the advantages of a simple process, stable operation, low investment and low production costs.
IPC Classes ?
- C01D 7/16 - Preparation from compounds of sodium or potassium with amines and carbon dioxide
- C01D 7/12 - Preparation of carbonates from bicarbonates
- C01F 11/46 - Sulfates
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2.
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METHOD FOR PREPARING BAKING SODA BY USING DESULFURIZED FLY ASH
| Application Number |
CN2024129618 |
| Publication Number |
2025/103162 |
| Status |
In Force |
| Filing Date |
2024-11-04 |
| Publication Date |
2025-05-22 |
| Owner |
- BEIJING COLUMBUS RECYCLING TECHNOLOGY CO., LTD. (China)
- INSTITUTE OF PROCESS ENGINEERING, CHINESE ACADEMY OF SCIENCES (China)
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| Inventor |
- Li, Baozhen
- Cao, Shaotao
- Li, Haibo
- Zhang, Yi
- Liu, Chenming
- Sheng, Yuxing
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Abstract
The present application specifically relates to the technical field of solid waste treatment. Disclosed is a method for preparing baking soda by using desulfurized fly ash. The method comprises: dissolution, coagulation-defluorination coupled precipitation defluorination, oxidative acidification, cooling crystallization, preparation of baking soda from sodium sulfate, reverse precipitation and preparation of baking soda from sodium chloride. In the present application, the industrial desulfurized fly ash is prepared into baking soda having a high added value by using an effective process, and the baking soda is reused in a desulfurization process, thereby achieving resource recycling of the industrial desulfurized fly ash. In addition, impurity ion COD, sulfite, carbonate, bicarbonate and fluorine ions, etc., in the desulfurized fly ash are comprehensively removed; and compared with a traditional process, the recycled baking soda has a higher purity and a higher recovery rate by means of process innovation.
IPC Classes ?
- C01D 7/00 - Carbonates of sodium, potassium, or alkali metals in general
- C01C 1/244 - Preparation by double decomposition of ammonium salts with sulfates
- C01C 1/16 - Halides of ammonium
- C05C 3/00 - Fertilisers containing other salts of ammonia or ammonia itself, e.g. gas liquor
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