What is the use of coal gangue?
Coal gangue is a solid waste generated during coal mining and washing and has long been considered an environmental burden. However, with the advancement of technology and the promotion of resource utilization, the value of coal gangue is gradually being discovered. This article will combine the hot topics and hot content on the entire network in the past 10 days, analyze the uses of coal gangue from multiple angles, and present its application fields with structured data.
1. Main uses of coal gangue
Coal gangue has a wide range of uses, covering many fields such as building materials, energy, environmental protection and agriculture. The following are its specific applications:
| Usage Category | Specific applications | Advantages |
|---|---|---|
| building materials | Brick making, cement admixtures, roadbed filling | Low cost and reduced consumption of natural resources |
| energy utilization | Power generation and gas production | Turn waste into treasure and replenish energy |
| Environmentally friendly materials | Wastewater treatment, soil remediation | Adsorb pollutants and improve the environment |
| agricultural applications | Soil improvement, fertilizer additives | Improve soil fertility and promote crop growth |
2. Application of coal gangue in building materials
Coal gangue has become an important raw material in the construction industry due to its physical and chemical properties. The following are its typical application cases:
| Application scenarios | Technical points | Market share |
|---|---|---|
| Coal gangue brick making | High temperature sintering, replacing clay | about 30% |
| cement admixture | After grinding, it can replace part of the cement. | about 15% |
| roadbed filling | Direct compaction or mixed use | about 20% |
3. Energy utilization of coal gangue
Coal gangue contains a certain amount of combustible substances, which can be converted into energy through technical means. The following are the main ways of its energy utilization:
| Utilization method | Technical principles | Benefit analysis |
|---|---|---|
| generate electricity | Circulating fluidized bed combustion technology | Each ton of coal gangue generates about 200-300 kilowatt hours of electricity |
| gas production | Gasification technology extracts combustible gases | Calorific value can reach 1000-1500 kcal/cubic meter |
4. Environmental protection value of coal gangue
The application of coal gangue in the field of environmental protection has attracted increasing attention, especially in wastewater treatment and soil remediation:
| Environmentally friendly applications | Mechanism of action | Effect |
|---|---|---|
| wastewater treatment | Adsorbs heavy metals and organic pollutants | The removal rate can reach more than 80% |
| soil remediation | Improve acidic soil and provide minerals | Increase soil pH and promote plant growth |
5. Application of coal gangue in agriculture
Coal gangue is rich in silicon, aluminum and other elements, and can be used as a soil conditioner or fertilizer additive:
| agricultural use | How to use | Yield increase effect |
|---|---|---|
| soil improvement | Apply directly to farmland | Increase crop yield by 10%-15% |
| Fertilizer additives | Mix with organic fertilizer | Reduce fertilizer consumption and reduce costs |
6. Future development trends
With the tightening of environmental protection policies and the advancement of resource technology, the comprehensive utilization of coal gangue will become a hot topic. Breakthroughs may be made in the following directions in the future:
1.High value-added product development: Such as extracting rare metals or preparing polymer materials.
2.Intelligent sorting technology: Improve coal gangue classification and utilization efficiency.
3.Cross-industry collaborative utilization: Combine with chemical industry, metallurgy and other industries to form a circular economic chain.
In short, the transformation of coal gangue from "waste" to "resource" not only solves environmental problems, but also provides low-cost raw materials for many industries, which has significant economic and social benefits.
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