Movement Characteristics And Parameter Optimization Of Elastic Screen Surface During Dewatering And Screening Of Gold Flotation Tailings

Mineral resources are important material basis for economic and social development and ecological civilization construction,as well as a constituent element of the ecological environment.The large amount of waste rocks and tailings produced in the process of mineral resource development are the main components of industrial solid waste.Tailings refer to the solid waste produced in the mine beneficiation process that has low content of useful components and is not suitable for further separation under current technical and economic conditions,including the beneficiation of various metallic and non-metallic ores.During the"Thirteenth Five-Year Plan"period,my country's tailings utilization has increased substantially.The average annual tailings emissions were 1.436 billion tons,which was lower than the 1.695 billion tons in the"Twelfth Five-Year Plan"period.Over the same period,the comprehensive utilization rate of tailings was 26%,much higher than the average level of 18.7%in the"Twelfth Five-Year Plan".Nevertheless,the comprehensive recovery rate of tailings in my country will remain at a low level for a long period of time in the future,and more than70%of tailings are still unused every year.In addition,the amount of tailings stockpiled in the past is huge.The tailings piled up in the tailing pond not only waste resources,pollute the environment,occupy land,and affect the lives of the surrounding people,but also pose great safety hazards.In view of the above environmental problems,the comprehensive recovery and utilization of tailings is of great significance.In this paper,theoretical calculations,testing and analysis systems,and screening tests are used to combine research methods.By analyzing the characteristics of tailings,the elastic screen surface is developed,the solid-liquid separation mechanism in the vibration dehydration process is explored,and the rigid-flexible coupling elastic screen surface is thoroughly studied.The strengthening mechanism of the screening effect,the study of the significance of the influence of multiple parameters on the dehydration effect and the law of interaction,the proposal of a coordinated optimization method for the elastic screening of dehydration parameters,to improve the dehydration efficiency,and provide guidance for the further comprehensive utilization of gold mine tailings for industrial applications;Provide support for the realization of environmental protection goals of reducing tailings emissions,improving mine backwater,and extending the service life of tailings ponds.The movement characteristics of the screen body and the screen surface under different excitation conditions are studied.Explore the influence of different excitation conditions on the amplitude,speed,acceleration and other parameters in the actual screening and dewatering process of the screen body and screen surface.It is found that when the excitation frequency is unchanged,compared to the screen body frequency spectrum,more obvious frequency peaks can be observed in the flexible area of the screen surface at twice and three times the excitation frequency.The y-direction acceleration amplitude in the flexible area of the screen surface is obviously greater than that of the screen body;and with the increase of the excitation frequency,the larger the y-direction acceleration amplitude in the flexible area of the screen surface relative to the amplitude of the screen body,the screen surface is flexible at f=16.67 Hz The acceleration amplitude in the y direction of the area is about 1.32 times that of the screen body.When the exciting force is constant,the y-direction amplitude of the screen body decreases with the increase of the exciting frequency and changes linearly;the y-direction amplitude of the elastic area of the screen surface increases with the increase of the exciting frequency,and the larger the frequency,the larger the amplitude Bigger.Repeated experiments are used to explore the influence of different vibration parameters on the elastic screening and dewatering effect of gold mine tailings under different moisture content conditions,and to determine the optimal value range of excitation force and frequency.Keep the processing capacity Q=8.79 t/(m²·h)unchanged,and when the feed water content W₀=25%,the best excitation parameters are the excitation frequency f=15.62 Hz and the excitation force F=9.40 kN.When the moisture content of the sieve is 11.19%,the dehydration rate is 55.25%,and the content of coarse particles on the sieve is 87.06%;when the moisture content of the feed material is W₀=30%,the best excitation parameter is the excitation frequency f=15.62Hz,Exciting force F=9.66 kN,at this time the moisture content on the sieve is 13.90%,the dehydration rate is 53.67%,and the content of coarse particles on the sieve is87.98%;when the moisture content of the feed is W₀=35%,the best excitation parameter For the excitation frequency f=15.62 Hz,the excitation force F=9.66 kN,at this time the moisture content of the sieve is 16.61%,the dehydration rate is 52.54%,and the content of the coarse particles on the sieve is 88.65%;the moisture content of the feed is W₀=40%,the best excitation parameters are the excitation frequency f=15.62Hz,and the resultant excitation force F=9.66 kN.At this time,the moisture content on the sieve is 19.67%,the dehydration rate is 50.83%,and the content of coarse particles on the sieve is 88.76%.In the case of feed water content W₀=45%,the best excitation parameter is the excitation frequency f=15.62 Hz,the excitation force F=9.85kN,and the moisture content of the sieve is 23.03%and the dehydration rate is 48.83%.The content of coarse particles on the sieve is 87.54%.When the moisture content of the feed is constant,the excitation frequency has a greater impact on the dehydration rate than the excitation force.Carry out vibration test on the on-site dewatering vibrating screen,analyze its vibration trajectory and the parameters of acceleration,speed and amplitude in various directions.According to the actual production,the moisture content of the oversize of the dewatering screen is relatively high,and the content of fine particles on the oversize is relatively high.Set up two vibrating dewatering screens with excitation frequency f=13.44 Hz and f=15.00 Hz respectively,and measure and calculate the moisture content of the feed and on-screen material of the two dewatering screens within 15 days.Through calculation,f=13.44 Hz vibrates,the dewatering rate of the dewatering screen is 43.98%.When f=15.00Hz,the dewatering rate of the vibrating dewatering screen is46.92%,and the dewatering efficiency is increased by 6.67%.When f=13.44 Hz,the on-screen coarse particle content of the vibrating dewatering screen is 84.57%,and when f=15.00 Hz,the on-screen coarse particle content of the vibrating dewatering screen is 86.15%,and the screening accuracy is increased by 1.87%.After the overall technological transformation of the comprehensive recovery and utilization of gold mine tailings,the daily processing of 6,000 tons of tailings,the production of more than2,000 tons of construction sand,2,000 tons of potash and feldspar,and 2,000 tons of dry-mixed mortar,have achieved a utilization rate of nearly 100%.Tailings turn waste into treasure.