Experimental Study on Plant-derived Urease-induced Calcium Carbonate Precipitation for Immobilizing Limestone Dusts
Dust in open-pit limestone mines can cause air,water,and soil pollution,adversely affect human health and surrounding ecosystems,and restrict the construction and production of green mines.To solve this problem,based on enzvme-induced carbonate precipitation technology,soybean urease was used to prepare a biological dust suppressant.The immobilization effect of biological dust suppressant on limestone dust was analyzed from macro and micro perspectives,and its immobilization mechanism was revealed.The results showed that the activity of urease was closely related to urea concentration and temperature.When the concentration of the cementing solution was 0.8 mol·L-1,the calcium carbonate precipitation ratio of the biological dust suppressant was the largest,with a pH of 7.47,indicating weak alkalinity.The production of calcium carbonate under the action of a biological dust suppressant was significantly improved,and the dust suppression efficiency was greatly improved.The biological dust suppressant can effectively improve the anti-wind erosion ability,and the dust suppression efficiency reaches 49.65％at the highest wind speed and 85.45％at the lowest wind speed.In addition,the biological dust suppressant can effectively slow down the corrosion rate,reaching 0.020 mm/a at 96 h,which is about 11.05％of water.The mineralization products of enzyme-induced carbonate precipitation(EICP)are mainly calcite calcium carbonate,which have the functions of filling,cementation,connection,and overall immobilization,and can effectively immobilize limestone dust.Studies have shown that the economy,environmental protection,sustainability,and positive impact on limestone dust of EICP technology make it a potentially promising solution for dust suppression.
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维普
