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摘要
In order to solve the problem of difficulty in resource utilization caused by excessive salinity and alkalinity of red mud, MgCl2 and dehydrated mineral slime of alumina industrial solid waste were used to control salinity and alkalinity of red mud. The effect of salinity and alkalinity regulation of red mud was characterized by pH, conductivity, mass fraction of alkaline anions (OH?, CO32?, HCO3?, AlO2?), mass fraction of soluble salt cations (K+, Ca2+, Na+, Mg2+) and germination rate of ryegrass seeds. The results showed that when red mud added with 7‰ MgCl2 and mixed with dehydrated mineral slime at a mass ratio of 1:4, pH decreased from 11.36 to 8.43, conductivity decreased from 1.557 mS·cm?1 to 1.166 mS·cm?1, and germination rate of ryegrass seeds reached 99.67%. The pH, conductivity and mass fractions of OH?, CO32?, AlO2?, K+, Ca2+, Na+ and Mg2+ of red mud decreased with increase of MgCl2 addition and mixture ratio of dehydrated mineral slime, thus germination rate of ryegrass seeds increased, which showed a good effect on salinity and alkalinity regulation. The results of this study can provide the basis for control salinity and alkalinity of solid waste red mud in alumina industrial. ? 2022, Science Press. All right reserved.
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