Research On Optimization And Renovation Of Ventilation System And Heat Harm Treatment In Deep Mining Of Jinqu Gold Mine

With the reduction of mineral reserves in shallow earth and the rapid social development,the demand for mineral resources has increased.As a result,the depth of underground mines is constantly increasing.The problems of ventilation and high-temperature heat damage in deep-well mining become more prominent.In order to effectively exploit and utilize the rich mineral resources in the earth's depth,the deep-well mining is one of the major trends in the future development of the mining industry.In this context,improve the safety production efficiency of mine enterprises,and ensure the physical and mental health of underground workers,it is of great practical significance to conduct research on ventilation optimization and heat damage management for deep wells.The main research contents and results of the paper are as follows:(1)On the basis of consulting and studying related research literatures such as ventilation optimization and thermal hazard management,the causes and hazards of problems such as ventilation difficulties and high-temperature heat damage on deep mining operations were analyzed.(2)Taking the 1118m pit mine in Jinqu gold mine as the research background,on the one hand,it analyzes the ventilation problems in the mine ventilation system,such as the complex and varied ventilation network,insufficient ventilation equipment,inaccurate ventilation structures,and inadequate ventilation management.On the other hand,the causes of the 280m horizontal high temperature heat damage operating environment were analyzed from the high temperature heat source heat release on the downhole working surface,which laid the foundation for the study of heat damage control.(3)Based on the results of in-depth analysis of the ventilation problems,three ventilation system optimization plans were drawn up.The ventilation network of the three solutions was solved by Ventsim(three-dimensional ventilation simulation system),and the entropy weight TOPSIS(approximation to the ideal solution ranking method)was used to optimize the model.The best optimized retrofit plan was implemented and the mine ventilation system was optimized and implemented.The air volume at the middle of the 280m horizontal yard increased from 0m~3/s to 6.7m~3/s,and the air volume on the west side working surface increased from 0.17m~3/s to 3.0m~3/s,strengthened circulation of air on the working surface.(4)After the wind flow circulation on the working surface was strengthened,and the traditional manual refrigeration cooling technology was compared and analyzed.The artificial refrigeration cooling technology using the mine water source as a cold source was proposed;and the use of a low-temperature mine water source at a level of 640m was established.The artificial refrigeration cooling system using the mine water source as a cold source produces low-temperature frozen water to provide cooling energy for thermal treatment of the high-temperature working surface of the well to achieve the purpose of cooling.The result shows that the temperature along the working surface of the 280m level was reduced to 27.6?,and the relative humidity on the working surface was also controlled at about 76%,which enabled the treatment of thermal damage on the high-temperature working surface of deep well mining.