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. With the improvement of environmental protection requirements, the utilization of desulfurization gypsum has gradually become an important issue in resource recycling. The following is a detailed analysis of desulfurized gypsum.
1. Definition and source of desulfurized gypsum
Flue Gas Desulfurization Gypsum (FGD Gypsum) is a by-product produced by limestone-gypsum wet desulfurization technology during the flue gas desulfurization process of coal-fired power plants. Its main component is calcium sulfate dihydrate (CaSO₄·2H₂O), which is similar in chemical composition to natural gypsum, but has slightly different purity and physical properties.
| project | Desulfurized gypsum | natural gypsum |
|---|---|---|
| Main ingredients | CaSO₄·2H₂O (≥90%) | CaSO₄·2H₂O (70%-90%) |
| Impurity content | Lower (contains a small amount of chlorine, magnesium, etc.) | Higher (containing clay, quartz, etc.) |
| color | white or off-white | gray, yellow or brown |
2. Production process of desulfurized gypsum
The production of desulfurized gypsum is mainly divided into the following steps:
3. Uses of desulfurized gypsum
Desulfurization gypsum is widely used in the following fields due to its good performance and environmental value:
| Application areas | Specific use | Proportion (%) |
|---|---|---|
| building materials | Gypsum board, cement retarder, self-leveling gypsum | 65% |
| agriculture | Soil conditioners, fertilizer additives | 15% |
| Chemical industry | Calcium sulfate filler and mold making | 10% |
| other | Road base material, artistic plaster | 10% |
4. Market status and trends of desulfurized gypsum
In recent years, with the advancement of environmental protection policies, the output and utilization rate of desulfurization gypsum have increased year by year. The following are the hot topics about desulfurized gypsum on the Internet in the past 10 days:
5. Environmental significance of desulfurized gypsum
The use of desulfurized gypsum not only reduces the emission of industrial waste, but also reduces the demand for natural gypsum mining, which has significant environmental benefits. According to statistics, the use of each ton of desulfurized gypsum can reduce approximately 0.5 tons of carbon dioxide emissions and save 1.2 tons of natural gypsum resources.
Summarize
As a by-product of coal-fired power plants, desulfurization gypsum can be "turned into treasure" through reasonable resource utilization. In the future, with technological advancement and policy support, the application fields of desulfurization gypsum will be further expanded, providing important support for circular economy and green development.
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