Effect of compound activator on copper slag activity and preparation of filling materials
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摘要: 為了實現銅爐渣的廢物利用,以堿激發方式為主研究銅爐渣制備礦用膠凝材料的可能性.選取生石灰、NaOH和早強劑組成的混合物作為復合激發劑,開展銅爐渣活性激發和充填材料制備試驗,并采用X射線衍射和掃描電子顯微鏡對銅爐渣水化產物進行分析.試驗結果表明,各激發劑對銅爐渣活性的影響順序依次為生石灰 > 早強劑 > NaOH,在復合激發劑的作用下爐渣凈漿試樣的7和28 d強度分別可以達到1.5和3.0 MPa以上.銅爐渣尾砂充填料28 d強度為1.0 MPa,流動性良好,滿足充填材料要求.銅爐渣早期水化產物主要有片狀的Ca(OH)2和C-S-H凝膠,隨著養護時間的增加,C-S-H凝膠Ca/Si比不斷減小,水化產物結構更加致密.養護時間至28 d時,銅爐渣中活性成分基本反應完全.Abstract: The preparation of cementitious materials for filling primarily via the alkali-activated method was discussed to recycle copper slags. A mixture of lime, NaOH, and early-strength agent was selected as a composite activator to carry out copper slag activation and filling material-preparation experiments, and the hydration products were analyzed by X-ray diffraction and scanning electron microscopy. The test results show that the effect of different activators on sample strength follows the order lime > early-strength agent > NaOH. The strengths of slag paste samples at 7 and 28 d post-curing reach 1.5 and 3.0 MPa, respectively. The strength of filling materials mixed by copper slag and tailings is 1.0 MPa as the curing ages are 28 d, and the slurry has well fluidity. These values meet the requirements of a suitable filling material. The early hydration products of copper slag mainly include Ca(OH)2 and C-S-H gel. As the curing time increases, the Ca/Si ratio of the C-S-H gel decreases and the structure of the hydration products becomes more compact. After curing for 28 d, the active components in the copper slag are nearly completely reacted.
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參考文獻
[2] Huang X Q, Hou H B, Zhou M, et al. Mechanical properties and microstructure analysis of copper tailings solidifying with different cementitious materials. Adv Mater Res, 2014(878):171 [3] Mithun B M, Narasimhan M C. Performance of alkali activated slag concrete mixes incorporating copper slag as fine aggregate. J Cleaner Prod, 2016, 112(1):837 [11] Shi C J, Qian J S. High performance cementing materials from industrial slags——a review. Resour Conserv Recy, 2000, 29(3):195 [12] Cihangir F, Ercikdi B, Kesimal A, et al. Paste backfill of highsulphide mill tailings using alkali-activated blast furnace slag:effect of activator nature, concentration and slag properties. Miner Eng, 2015, 83:117 -
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