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Integrating geometallurgical ball mill throughput predictions into short-term stochastic production scheduling in mining complexes

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International Journal of Mining Science and Technology 2023年第2期33卷 185-199页

作者： Christian Both Roussos Dimitrakopoulos COSMO–Stochastic Mine Planning Laboratory Department of Mining and Materials EngineeringMcGill UniversityMontreal H3A 0E8Canada

This article presents a novel approach to integrate a throughput prediction model for the ball mill into short-term stochastic production scheduling in mining *** datasets for the throughput prediction model include penetration rates from blast hole drilling(measurement while drilling),geological domains,material types,rock density,and throughput rates of the operating mill,offering an accessible and cost-effective method compared to other geometallurgical ***,the comminution behavior of the orebody was geostatistically simulated by building additive hardness proportions from penetration rates.A regression model was constructed to predict throughput rates as a function of blended rock properties,which are informed by a material tracking approach in the mining ***,the throughput prediction model was integrated into a stochastic optimization model for short-term production *** way,common shortfalls of existing geometallurgical throughput prediction models,that typically ignore the non-additive nature of hardness and are not designed to interact with mine production scheduling,are overcome.A case study at the Tropicana Mining Complex shows that throughput can be predicted with an error less than 30 t/h and a correlation coefficient of up to *** integrating the prediction model and new stochastic components into optimization,the production schedule achieves weekly planned production reliably because scheduled materials match with the predicted performance of the *** to optimization using conventional mill tonnage constraints reveal that expected production shortfalls of up to 7%per period can be mitigated this way.

关键词： Geometallurgy Stochastic optimization Short-term open pit mine production scheduling Measurement while drilling non-additivity Hardness

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A general information theoretical proof for the second law of thermodynamics

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Science China(Physics,Mechanics & Astronomy) 2008年第7期51卷 813-816页

作者： ZHANG QiRen Department of Technical Physics, Peking University, Beijing 100871, China 1. Department of Technical Physics Peking University Beijing 100871 China

It is shown that the conservation and the non-additivity of the information, together with the additivity of the entropy, make the entropy increase in an isolated system. The collapse of the entangled quantum state offers an example of the information non-additivity. Nevertheless, the non-additivity of information is also true in other fields in which the interaction information is important. Examples are classical statistical mechanics, social statistics and financial processes. The second law of thermodynamics is thus proven in its most general form. It is exactly true not only in quantum and classical physics but also in other processes in which the information is conservative and non-additive.

关键词： information conservation non-additivity of information entropy increase

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