锰尾矿基胶凝材料配方优化及水化机理分析

发布时间：2018-09-08 11:15

【摘要】：为研究低品位锰尾矿胶凝活性,将生石灰、氢氧化钠、水玻璃和石膏等激发剂添加到湖南永州低品位碳酸锰尾矿中,采用正交实验研究不同激发剂及掺量对锰尾矿基胶凝材料抗压强度和软化系数的影响,探究其潜在胶凝活性激发的最佳配方。实验结果表明,当生石灰、水玻璃、石膏掺量分别为10%、1.5%和4%时,胶凝材料净浆试体的各个龄期抗压强度最大,其中28 d抗压强度达到4.91 MPa,软化系数达到0.74。XRD、DTA和SEM微观实验发现:锰尾矿基胶凝材料主要水化产物为钙矾石和水化硅酸钙凝胶,随龄期持续增多并相互交织搭接,使试体内部结构逐渐致密,缝隙减少,提高了试体抗压强度和软化系数,因此,该激发剂可有效激发锰尾矿潜在胶凝活性。
[Abstract]:In order to study the cementitious activity of low-grade manganese tailings, activators such as quicklime, sodium hydroxide, water glass and gypsum were added to the low-grade manganese carbonate tailings in Yongzhou, Hunan Province. The effects of different activators and dosage on compressive strength and softening coefficient of manganese tailings based cementitious materials were studied by orthogonal experiment. The experimental results show that when the content of quicklime, sodium silicate and gypsum is 101.5% and 4%, respectively, the compressive strength of each age of cementitious material is the highest. In 28 days, the compressive strength reached 4.91 MPa, softening coefficient of 0.74.XRDX DTA and SEM. It was found that the main hydration products of manganese tailings were ettringite and calcium silicate hydrate gel, which increased with age and interwoven and overlapped with each other. The internal structure of the sample was gradually densified and the gap was reduced, which increased the compressive strength and softening coefficient of the sample. Therefore, the activator could effectively stimulate the potential cementitious activity of manganese tailings.
【作者单位】：辽宁工程技术大学土木与交通学院;中国科学院武汉岩土力学研究所;
【基金】：国家水体污染控制与治理科技重大专项(2011ZX07104-002-02) 国家自然科学基金资助项目(51274109)
【分类号】：TD926.4

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