Study On Compled Resistivity And Strength Properties Of Red Mud Curing Copper Ion Pollution Of Loess

Red mud is a solid waste produced in the process of alumina production in aluminum plant.At present,the amount of untreated red mud in the world has exceeded 3*10¹⁰ T,and at the rate of 1.2*10⁹ t/years,the treatment of red mud is mostly wet stacked,and the red mud yard not only consumes the land resources,but its harmful substances will soak into the soil,resulting in soil alkalinity and even pollution.To dye groundwater resources.The properties of red mud are studied,and applied to various fields,so as to realize the utilization of red mud and reduce the harm of red mud to the environment.Soil heavy metal pollution is one of the most common destruction of land resources.The exploitation of non-ferrous metals and the discharge of industrial wastewater caused heavy metal ions to enter the soil and cause heavy metal pollution in the soil.The invasion of heavy metal ions will destroy the soil structure,change the physical and chemical properties of the soil,and the soil is affected by the heavy metal ions to reduce the bearing capacity.The hidden danger of engineering construction is caused.Copper contaminated soil is a common type of heavy metal contaminated soil.Al₂O₃,Fe₂O₃,CaO and other oxides in red mud are all effective active components to adsorb heavy metal ions,and the larger specific surface area of red mud also increases their adsorption properties.In this paper,red mud is used as adsorbent,cement and lime together to form the red mud cement lime system to solidify/stabilize the copper ion polluted loess,so as to achieve the effect of"changing waste into treasure"and"treating waste by waste".Eight groups of copper ion content gradients were set up in this paper:0,0.05%,0.1%,0.25%,0.5%,0.75%,1%,2.5%,five curing ages:7d,14d,28d,60d,90d.The curing of copper ion polluted loess by red mud cement stone ash system was studied with the aid of complex resistivity method,unconfined compressive strength test and pressure sensitivity test.Stabilization effect.The main results are as follows:?1?Under different current frequencies,the amplitude and phase angle of the complex resistivity change obviously,and the specimen has amplitude frequency characteristic and phase frequency characteristic.The rate of test of complex resistivity amplitude and the phase angle decreased with the increase of the current frequency and different age and different copper content.?2?When the copper ion content of the specimen is affected by the copper ion content and the copper ion content of the specimen is 2.5%,the amplitude of the complex resistivity of the specimen is the lowest.When the copper ion content is at 0-1.0%,the amplitude of the complex resistivity of the specimen is small,and it is in a small wave state.?3?Tthe amplitude of complex resistivity has a good positive correlation with the curing age.The amplitude of complex resistivity increases with the increase of curing age.There is a positive correlation between the unconfined compressive strength and the curing age.?4?The specimen has a good pressure sensitivity.Through the change of the resistivity amplitude of the specimen,it can reflect the compression deformation of the specimen,and the method of complex resistivity can be applied to the safety detection and monitoring of the actual engineering structure system.?5?When the copper ion content is not more than 1%,the red mud cement lime system has a good curing/stabilizing effect,and the curing effect is worse when the concentration of copper ion is at the maximum value of 2.5%.