Abstract: The raw material characteristics of laterite nickel ore,such as high viscosity and inclusion of large ore lumps, lead to low crushing efficiency.To improve the crushing efficiency of the double-tooth roller crusher for this ore,the crushing process of laterite nickel ore in the double-tooth roller crusher was studied through simulation analysis.First,the discrete ele ment parameters of the ore in laterite nickel ore were calibrated via uniaxial compression tests.Then,combined with the dis crete element method (DEM) and the Tavares crushing model,the influence laws of parameters such as the number of crusher teeth,tooth height of the roller teeth,and rotation speed of the roller teeth on the processing capacity of laterite nickel ore and the particle size distribution of products were analyzed.The results showed that:the more the number of crusher teeth,the high er the tooth height,and the lower the rotation speed of the roller teeth,the more serious the material adhesion.When the num ber of teeth is 3,the tooth height of the roller teeth is 40 mm,and the rotation speed of the crusher is 70 r/min,the crushing processing capacity and particle size control of laterite nickel ore reach the optimal balance,and the discharge particle size can meet the process requirements of subsequent separation or smelting.After installing comb plates on both sides of the roller teeth in the crushing chamber,the material processing capacity is increased to 91.5 kg,which is 13% higher than that without comb plates,significantly improving the crushing operation effect;In the crushing of high-viscosity laterite nickel ore,the shape of the roller teeth has a limited effect on improving the processing capacity.The research results can provide theoretical and technical support for the crushing conditions of viscous materials.

Key words: laterite nickel ore,double toothed roller crusher,parameter calibration,simulation analysis