Modeling of Vertical Shaft Impact Crushers
Licentiate thesis, 2021

One of the largest products in most civilized societies is concrete used to build various types of constructions. To create this product, a mixture of cement, chemical binders, and rock aggregates are combined and then poured into molds where it hardens. The sand part of the rock aggregates is either from natural sources or manufactured. Vertical shaft impact crushers can be used to create this machine sand but existing models make it hard to plan new sites and achieve a viable replacement to the natural sand.

In this thesis, the use of vertical shaft impact crushers to crush aggregate rock to rounder particles is investigated. The main aim of this is to develop and further the understanding of the relationship between the machine and material properties with respect to the resulting crushed product in an effort to achieve an improved product. In order to gain a better understanding of the underlying mechanics of particle breakage, Discrete Element Method has been used to obtain particle collision energies. Several different product size distribution models have also been used to better predict the behavior of different crushers and feed sizes. To facilitate this, a framework to improve sites has been developed.

The resulting framework simulates existing VSI machines and optimizes the machine parameters with respect to the specified feed material and PSD to create sought products. The framework can also be used to optimize existing sites which increases the effectiveness in terms of minimizing energy usage and waste products.



Energy Modeling

Breakage Modeling

M Room Gamma
Opponent: Johannes Quist, Fraunhofer-Chalmers Centre, Sweden


Simon Grunditz

Chalmers, Industrial and Materials Science, Product Development

Fit-for-Purpose VSI Modelling Framework for Process Simulation

Minerals,; Vol. 11(2021)

Journal article

Prediction of Collision Energy in the VSI Crusher

Proceedings; European Symposium on Comminution and Classification 2015 September 7-10,; (2015)

Other conference contribution

Grunditz, S. Evertsson, CM. Hulthén, E. Bengtsson, M. The Effect of Rotor Tip Speed of a Vertical Shaft Impactor on the Collision Energy Spectrum

Development of Simulation Capability and Advanced Process Models for Rock Material, Ore, and Mineral Production

Swedish Mineral Processing Research Association, 2015-11-19 -- 2016-12-31.

VINNOVA, 2013-11-01 -- 2016-12-31.

Development Fund of the Swedish Construction Industry (SBUF), 2013-11-01 -- 2017-06-30.

Subject Categories

Production Engineering, Human Work Science and Ergonomics

Construction Management

Other Environmental Engineering

Driving Forces

Sustainable development

Areas of Advance


IMS: 2021-4


Chalmers University of Technology

M Room Gamma


Opponent: Johannes Quist, Fraunhofer-Chalmers Centre, Sweden

More information

Latest update