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Experiment of Marinating and Leaching the Witherite Tailing and the Study of It’s Disposal and Comprehensive Utilization

Author: LiWeiShan
Tutor: HuangShengYan
School: Chongqing University
Course: Environmental Engineering
Keywords: The Witherite Last slag Immersion test Leaching experiments Processing and comprehensive utilization of tailings
CLC: X705
Type: Master's thesis
Year: 2007
Downloads: 125
Quote: 1
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Abstract


Tailings piled up not only a large number of occupation of land, destruction of ecosystems, but also an important source of heavy metal pollution. Depth study of the release of heavy metals law to provide a scientific basis for solid waste pollution prevention and environmental management. The city population County Witherite has a wealth of mineral resources, as Witherite the expansion of mining production, tailings accumulation is gradually increasing. How to deal with these high-barium-containing tailings has also become a problem can not be ignored. Witherite tailing the issue is a large number of the Chongqing City, the county population for the study, established groundwater protection objectives barium ion leaching leaching characteristics and laws derived through the simulation of dynamic and static experiments, analysis of different factors, the barium ion leaching difference under different conditions, to guide the tailings final disposal. Tailings static orthogonal immersion test results showed that: the average impact on the the static leaching rate of barium ions were: leaching time> pH values> solid-liquid ratio; three factors, the barium ion concentration of the leaching solution the average impact : solid-liquid ratio> leaching Time> pH value. Barium ions in the neutral pH of acidic pH conditions have more leaching, so the purpose of preventing the barium ion contamination under natural conditions, to control tailings and water contact and the contact time is the key, you should try to avoid slag and water contact, at any time, the isolation of the embodiment with water to reduce pollution of the environment are effective and necessary. Natural acid rain tailings simulation the Leaching Experiment results show that: within 30 days of leaching experiments, Ba 2 concentration leaching law is a renewed drop of the ramp-up process began 10 better days after the steady rise in line with the the Binomial y = 0.0057x 2 -0.1079x 10.317 the coefficient R 2 = 0.9967, as the leaching time the extension of leaching solution Ba 2 concentration has a slow growth the leaching ratio soaking able to get more of barium ions leaching. The experimental results of the study combined with local conditions in the city population, learn from the landfill groundwater and surface water facilities construction experience, design and planning of the construction of the tailings; explore the feasibility of using tailings backfill approach proposed practical recommendations, and evaluate a variety of possible the Witherite tailings comprehensive utilization of channels, including: beneficiation enrichment - chemical purification production technology, a system of high purity the spherical barium carbonate, barium silicon smelting calcium alloy and cement mineralizer . The thesis conclusions can be used to help and guide the local mining production, to provide scientific support to the department of environmental protection and management decision-making departments.

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CLC: > Environmental science, safety science > Processing and comprehensive utilization of waste > General issues > Solid waste disposal and utilization
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