Coal flotation processess presentat.pptx

Coal flotation processess presentation file

1. Coal Flotation An Overview of Coal Flotation Processes and Products

2. Introduction to Coal Flotation Coal flotation is essential in processing coal fines, usually below 250 μm, sometimes up to 1 mm. With the rise of longwall mining methods, the production of fines has increased, making flotation more critical. Environmental regulations have driven the use of flotation as the primary method for recovering coal fines.

3. Coal Flotation Circuits Coal flotation circuits are typically simple, involving roughing and scavenging stages. In some cases, only roughing is required to achieve the desired recovery. Mass recovery in coal flotation can be high, up to 70%, with significant frother usage due to adsorption by coal.

4. Collectors and Frothers in Coal Flotation Petrochemical products like diesel oil, liquid paraffin, and kerosene are commonly used as collectors in coal flotation. Mechanical paddles are often used to remove heavy froth from flotation cells.

5. Products of Coal Flotation Coal operations can produce two main products: high-value coking coal and lower-value thermal coal. Coking coal is used in pyrometallurgical industries and requires low impurity levels (5% to 8% ash content). Thermal coal is used for power generation, with flotation concentrates ranging from 8% to 14% ash content.

6. Flotation Technologies for Coking Coal Coking coals often require froth washing due to their need for low impurity levels. The use of Jameson cells and flotation columns is increasing for producing high-quality coking coal.

7. Flotation Technologies for Thermal Coal Thermal coals typically achieve the desired ash content without froth washing. Mechanical flotation cells remain common in processing thermal coals.

8. Conclusion Coal flotation is a critical process in recovering fines and producing coking and thermal coals. The choice of flotation technology and circuit design depends on the type of coal and desired product specifications.