What is desulfurized gypsum?
In today's context of increasing environmental awareness, desulfurization gypsum, as an important industrial by-product, has received widespread attention. This article will introduce in detail the definition, use, production process and market status of desulfurization gypsum, and present you with a comprehensive analysis report based on hot topics in the past 10 days.
1. Definition of desulfurized gypsum
Desulfurization gypsum, also known as flue gas desulfurization gypsum (FGD Gypsum), is a by-product produced during the flue gas desulfurization process in coal-fired power plants or other industrial enterprises. Its main component is calcium sulfate dihydrate (CaSO₄·2H₂O), which has a similar chemical composition to natural gypsum, but is different in physical form and impurity content.
2. Production process of desulfurized gypsum
The production of desulfurized gypsum is mainly completed through the wet limestone-gypsum desulfurization process. The following are the main steps of the process:
| step | describe |
|---|---|
| 1. Smoke absorption | The flue gas passes through the absorption tower and contacts the limestone slurry, where sulfur dioxide (SO₂) is absorbed. |
| 2. Chemical reaction | SO₂ reacts with limestone (CaCO₃) to form calcium sulfite (CaSO₃), which is further oxidized to calcium sulfate (CaSO₄). |
| 3. Crystallization and dehydration | The calcium sulfate solution crystallizes to form calcium sulfate dihydrate, which is desulfurized to obtain desulfurized gypsum. |
3. Uses of desulfurized gypsum
As an environmentally friendly material, desulfurized gypsum is widely used in many fields. Here are its main uses:
| use | Specific applications |
|---|---|
| building materials | Used in the production of gypsum boards, gypsum blocks, stucco gypsum, etc. |
| Cement retarder | Added to cement to delay cement setting time. |
| soil improvement | Used to improve soil structure and adjust soil pH. |
| Other industries | Used in papermaking, medicine, chemical industry and other fields. |
4. Market status of desulfurized gypsum
In recent years, with the strengthening of environmental protection policies and the promotion of comprehensive utilization of resources, the market demand for desulfurization gypsum has continued to grow. Here is recent market data:
| index | data |
|---|---|
| global production | About 150 million tons/year |
| China production | About 80 million tons/year |
| Main application areas | Asia, Europe, North America |
| price trend | Stable and rising, supply exceeds demand in some areas |
5. The relationship between hot topics in the past 10 days and desulfurization gypsum
1.Carbon neutrality goal drives desulfurization gypsum utilization: Recently, many governments have reiterated the goal of carbon neutrality, and desulfurization gypsum has been widely discussed as an important part of the circular economy.
2.Green transformation of the building materials industry: Building materials companies have adopted desulfurized gypsum to replace natural gypsum to reduce dependence on natural resources.
3.New Regulations on Industrial Solid Waste Management: Some regions have introduced new regulations requiring industrial enterprises to strengthen the recycling of desulfurized gypsum to avoid environmental pollution.
6. Future development trends of desulfurized gypsum
With the advancement of technology and policy support, the application prospects of desulfurization gypsum are very broad. The following trends may appear in the future:
1.High value-added utilization: Convert desulfurization gypsum into higher value products through deep processing technology.
2.Cross-industry cooperation: Building materials, chemicals, environmental protection and other industries will strengthen cooperation to form a recycling industry chain for desulfurization gypsum.
3.international market: With the unification of global environmental protection standards, the international trade of desulfurization gypsum will become more active.
Conclusion
Desulfurization gypsum, as an environmentally friendly industrial by-product, not only solves the environmental problems of flue gas desulfurization, but also provides high-quality raw materials for many industries. In the future, with continuous technological innovation and continued policy support, desulfurization gypsum will play a greater role on a global scale.
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