What is desulfurized gypsum
Desulfurization gypsum is an industrial by-product, mainly derived from solid waste generated during the flue gas desulfurization process of coal-fired power plants. As environmental protection requirements become increasingly stringent, the utilization value of desulfurization gypsum is gradually being discovered and it has become an important material for resource utilization. This article will introduce in detail the definition, source, characteristics, uses of desulfurization gypsum, as well as hot topics and hot content in the past 10 days.
1. Definition and source 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. Its main component is calcium sulfate dihydrate (CaSO₄·2H₂O), which has a similar chemical composition to natural gypsum, but has slightly different physical properties. The production process of desulfurized gypsum is as follows:
| step | describe |
|---|---|
| 1. Flue gas desulfurization | Coal-fired power plants use a limestone-gypsum wet desulfurization process to react sulfur dioxide (SO₂) in the flue gas with limestone slurry to generate calcium sulfite. |
| 2. Oxidation reaction | Calcium sulfite is further oxidized in oxidizing air to form calcium sulfate. |
| 3. Crystallization and separation | The calcium sulfate solution undergoes processes such as concentration, crystallization, and dehydration to finally form desulfurization gypsum. |
2. Characteristics of desulfurized gypsum
Compared with natural gypsum, desulfurized gypsum has the following characteristics:
| characteristic | Desulfurized gypsum | natural gypsum |
|---|---|---|
| chemical composition | CaSO₄·2H₂O (content ≥90%) | CaSO₄·2H₂O (content ≥85%) |
| physical form | Powder, fine particles | lumpy or granular |
| Moisture content | 10%-15% | <5% |
| Impurity content | Contains a small amount of lime, alumina, etc. | Less impurities |
3. Uses of desulfurized gypsum
As an environmentally friendly material, desulfurized gypsum is widely used in the following fields:
| Application areas | Specific use |
|---|---|
| building materials | Produces gypsum boards, gypsum blocks, cement retarder, etc. |
| agriculture | Used to improve soil and provide nutrients such as calcium and sulfur. |
| Chemical industry | Preparation of chemical products such as sulfuric acid and ammonium sulfate. |
| Environmental friendly | Used for wastewater treatment, heavy metal adsorption, etc. |
4. Hot topics and content in the past 10 days
According to the entire Internet search, the hot topics about desulfurization gypsum in the past 10 days mainly focus on the following aspects:
| hot topics | Hot content |
|---|---|
| Resource utilization of desulfurized gypsum | Many governments have introduced policies to encourage the application of desulfurized gypsum in the field of building materials and reduce the mining of natural gypsum. |
| Environmental protection technology innovation | The new desulfurization gypsum drying technology was successfully developed, significantly reducing energy consumption and improving utilization efficiency. |
| market price fluctuations | Affected by the relationship between supply and demand, the price of desulfurization gypsum has increased slightly in some areas. |
| international news | European and American countries have increased exports of desulfurized gypsum, and China's imports have increased. |
5. Summary
As an important industrial by-product, the resource utilization of desulfurized gypsum not only contributes to environmental protection, but also creates economic value. With the advancement of technology and policy support, the application fields of desulfurization gypsum will be further expanded. In the future, the green and high-value utilization of desulfurization gypsum will become an important direction for the development of the industry.
Through the introduction of this article, I believe everyone has a more comprehensive understanding of desulfurization gypsum. If you are interested in the utilization of desulfurization gypsum or related technologies, you can continue to pay attention to industry trends and policy changes.
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