double roller crusher for slag processing

Product Specification

1. Product Introduction

The double roller crusher is a vital, heavy-duty sizing machine engineered for the industrial recycling and resource reclamation sector, specifically designed to process various types of metallurgical slag. Its core function involves utilizing two parallel, counter-rotating rollers to exert immense compressive and shearing forces on raw material fed into the crushing chamber. Built with reinforced structural frameworks, high-torque drivetrains, and advanced hydraulic protection systems, it successfully bridges the gap between raw industrial waste dumps and high-value downstream milling or magnetic separation circuits. Modern double roller crushers have evolved with specialized metallurgical options, such as segmented high-chromium liners and tungsten-carbide studded surfaces, allowing them to withstand the extreme abrasiveness and unpredictable metallic inclusions inherent to industrial slag.

2. Application

Double roller crushers are widely used in environmental recycling, cement manufacturing, steel mills, and non-ferrous metal recovery plants. Specific materials processed include blast furnace slag, steel slag, copper slag, nickel slag, and granulated phosphorus slag. The process stages encompass primary or secondary reduction for aggregate production, pre-grinding preparation for vertical roller mills, and matrix shattering for metal liberation. Additionally, specialized models address specific operational challenges. For instance, high-pressure hydraulic models are utilized in steel slag lines to cleanly fracture tough silicate shells away from trapped elemental iron cores. Low-speed, high-torque models are deployed in wet-granulated slag setups, preventing sticky material buildup while maintaining maximum processing throughput.

3. Working Principle

The fundamental operating principle of a double roller crusher involves feeding irregular, abrasive slag chunks into the crushing chamber from above, where they are gripped by a calculated nip angle between two synchronized rollers. As the rollers rotate toward each other, the material is drawn downward and subjected to continuous, immense mechanical compression and friction. This localized force causes the brittle, glassy slag matrices to fracture cleanly along their natural fault lines, while simultaneously exposing and liberating any embedded metallic pieces. The crushed material drops through the adjustable clearance gap at the bottom of the rollers by gravity. The size of the final product is strictly controlled by the distance between the two roller faces, ensuring a uniform output with minimal generation of unmarketable ultra-fine dust.

4. Advantages

High-efficiency separation and broad applicability: Effectively shatters dense silicate matrices to achieve excellent liberation of trapped elemental metals. Next-generation composite alloy rollers allow the machine to process air-cooled, glassy, or highly abrasive slags with a high reduction ratio and optimal grain shape. Robust and Flexible Processing Capacity: Equipment specifications cover a broad spectrum of processing volumes and dimensions, allowing the crusher to easily handle everything from low-tonnage specialized metal reclamation lines to high-capacity, continuous regional slag recycling centers. Low Energy Consumption and Stable Operation: The direct compression mechanism eliminates the massive frictional and kinetic energy losses common in high-speed impactors. Power consumption per ton is drastically minimized, and the equipment retains a heavy-duty drivetrain capable of full-load restarts under punishing conditions. Convenient Operation and Maintenance: Features an interchangeable, segmented roller liner design that allows maintenance crews to replace high-wear center sections quickly without dismantling the entire main shaft assembly. Built-in scraper bars continuously clean damp, granulated slag from the roller faces, preventing clogging and keeping maintenance intervals short. High Intelligence and Automation: Integrated with advanced PLC automation, the system provides real-time online monitoring of hydraulic pressure, bearing temperatures, and roller wear states. Automated gap adjustments can be performed remotely, allowing operators to rapidly alter product size specifications to match shifting commercial aggregate demands. Optimized structural design: Equipped with an instantaneous hydraulic accumulator relief system that protects the machine from catastrophic failures. If an uncrushable piece of trapped structural steel or an excavator tooth enters the chamber, the movable roller automatically retracts in milliseconds to let it pass safely, resetting immediately to maintain continuous plant operation.