Abstract Microbial Induced Calcium Carbonate Precipitation (MICP) has some disadvantages, such as low crystallization conversion rate of calcium carbonate and insufficient strength properties of tailings. In this paper, a modified method combining soft template calcium carbonate mineralization technology with microbial grouting reinforcement technology was proposed. The tailings solidification was studied with the control of nine different concentrations of egg white (0%, 5%, 10%, 15%, 20%, 30%, 40%, 60% and 80%). After 14 days of grouting reinforcement experiment, the results are as follows. ① The shear strength of tailings was improved remarkably, and the best reinforcement effect was at 5% egg white. Compared with the control group, the effective cohesion of tailings increased by 437.61%. ② The fitting curve between the content of calcium carbonate in tailings and its cohesion shows that there is an exponential relationship between them. ③ The results of microscopic examination showed that the proportion of columbite-type calcium carbonate increased with the increase of egg white concentration. The corresponding egg white concentration of calcite-type calcium carbonate was 5%. At this time, the maximum particle size could reach 100 µm. ④ The infrared absorption characteristic curves of the interporous cements of tailings indicate that the changes of crystal form, crystal morphology and particle size of calcium carbonate may be due to the strong interaction between polar groups such as N H, C H and C O in the composition of egg white and calcium carbonate crystal. ⑤ The bonding, connecting and packaging of fibers in egg white will cause fundamental changes in the bonding mode of tailings. The test results showed that the combination of mineralization regulation of egg white and MICP technology can achieve complementary advantages, which is of great engineering significance for improving the stability and safety of tailings dam.

中文翻译：

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蛋清调控下尾矿微生物注浆加固试验

摘要 微生物诱导碳酸钙沉淀法(MICP)存在碳酸钙结晶转化率低、尾矿强度不够等缺点。本文提出了软模板碳酸钙矿化技术与微生物注浆加固技术相结合的改良方法。用九种不同浓度的蛋清（0%、5%、10%、15%、20%、30%、40%、60% 和 80%）作为对照研究了尾矿固化。经过14天的注浆加固实验，结果如下。①尾矿抗剪强度显着提高，5%蛋清补强效果最佳。与对照组相比，尾矿有效凝聚力提高了437.61%。②尾矿中碳酸钙含量与其黏聚力的拟合曲线表明，二者之间存在指数关系。③镜检结果表明，随着蛋清浓度的增加，铌铁矿型碳酸钙的比例增加。相应的方解石型碳酸钙的蛋清浓度为5%。此时，最大粒径可达到 100 µm。④尾矿多孔胶结物的红外吸收特性曲线表明，碳酸钙的晶型、晶体形态和粒径的变化可能是由于蛋类成分中NH、CH和CO等极性基团之间的强相互作用所致。白色和碳酸钙结晶。⑤ 粘接，蛋清中纤维的连接和包装将引起尾矿粘结方式的根本变化。试验结果表明，蛋清矿化调控与MICP技术相结合，可实现优势互补，对提高尾矿坝的稳定性和安全性具有重要的工程意义。