Coal gangue is a solid waste generated during coal mining and washing, containing a certain amount of pyrite (iron sulfide). Through crushing, separation, and other processes, sulfur concentrate can be extracted from coal gangue for producing sulfuric acid and other chemical products. With stricter environmental regulations and maturing resource utilization technologies, sulfur extraction from coal gangue has become an industrial direction with both environmental and economic benefits.

A plant in Guizhou uses Hua Sheng Ming roll crushers for coal gangue crushing to extract sulfur concentrate, representing one of the region’s representative coal gangue comprehensive utilization projects.

1210 roll crusher

Project Background

The customer is a coal gangue processing enterprise in Guizhou, adopting a “two-stage crushing + magnetic separation” process route, using two Hua Sheng Ming heavy-duty 1210 hydraulic roll crushers for coal gangue fine crushing and sulfur concentrate extraction.

The customer is a long-term partner of Hua Sheng Ming, having previously purchased the same model multiple times, with this order being a repeat purchase for the same project.

Process Route

The production line adopts a proven “two-stage crushing + magnetic separation” process:

1. Primary Crushing: A double-toothed roll crusher reduces coal gangue from within 20cm to below 3cm

2. Secondary Crushing: The heavy-duty 1210 hydraulic roll crusher further reduces the material to below 3mm

3. Magnetic Separation: A magnetic separator extracts sulfur concentrate from the material

The key to sulfur extraction from coal gangue lies in “liberation”—fully separating pyrite crystals from the gangue matrix. The fine crushing size below 3mm effectively improves the liberation degree of pyrite from gangue, providing ideal feed conditions for downstream magnetic separation or flotation processes, which is the critical prerequisite for improving sulfur concentrate grade and recovery rate.

Equipment Configuration and Performance

1210 roll crusher

Key Features of the 1210 Full-Hydraulic Roll Crusher:

The equipment operates on the low-speed inter-particle compression principle. Two rolls rotate in opposite directions, applying sustained compressive force to the coal gangue, causing pyrite crystals to separate along natural bonding surfaces. This ensures mineral liberation while effectively reducing over-grinding.

Screenless Design – Handles Moist Materials Without Clogging:

Coal gangue often contains moisture and clay during mining and stockpiling. Traditional crushers with screens are prone to clogging and frequent shutdowns. The roll crusher features a screenless bottom design, discharging material immediately after crushing, fundamentally eliminating screen clogging issues. It maintains continuous and stable operation even during rainy seasons or under high-moisture conditions.

Precise and Adjustable Discharge Size:

The hydraulic gap adjustment system allows flexible control of the roll gap, enabling discharge size adjustment according to downstream flotation or magnetic separation requirements to meet different production conditions.

Hydraulic Retraction Protection:

When encountering unbreakable material such as tramp iron, the rolls automatically retract to release pressure, then reset after the foreign object is discharged, reducing equipment damage risk and ensuring continuous production.

1210 roll crusher production site

Customer Feedback

The customer reported that the equipment operates stably with precise and controllable discharge size, effectively ensuring the recovery performance of downstream magnetic separation processes.

Conclusion

In sulfur extraction from coal gangue, the key to the crushing stage lies in achieving full liberation of pyrite from gangue while controlling over-grinding. The Hua Sheng Ming 1210 hydraulic roll crusher, with its combined advantages of gentle liberation, precise particle size control, and wear resistance, provides reliable equipment support for improving sulfur concentrate recovery rates in coal gangue sulfur extraction projects. If you are looking for suitable crushing solutions for coal gangue sulfur extraction or comprehensive utilization projects, please contact Hua Sheng Ming for targeted configuration recommendations based on your material characteristics and production requirements.