(1. 福州大學 紫金礦業(yè)學院，福州 350116；
2. 東北大學 資源與土木工程學院，沈陽 110819)
摘 要: 通過轉鼓對高壓輥磨機破碎后的低品位銅礦石進行制團并利用地質聚合反應固化團聚體，考察堿激發(fā)劑配比和用量、水添加量、偏高嶺土添加量等因素對團聚體粒度、抗壓強度和耐酸性質的影響，并借助FT-IR和NMR分析技術研究地質聚合反應提高團聚體耐酸性的機理。結果表明：在制團過程中，堿激發(fā)劑用量和水添加量的增加均有助于增大團聚體的成團粒度并提高其耐酸性；堿激發(fā)劑中硅酸鈉含量高時團聚體耐酸性好，少量氫氧化鈉的引入可提高團聚體的強度；偏高嶺土的加入能顯著提升團聚體的耐酸性。FT-IR和NMR測試結果表明，地質聚合物凝膠含量增多是團聚體耐酸性增強的原因。
關鍵字: 低品位銅礦石；地質聚合反應；制團；耐酸性
（1. College of Zijin Mining, Fuzhou University, Fuzhou 350116, China;
2. College of Resources and Civil Engineering, Northeastern University, Shenyang 110819, China）
Abstract:A low-grade copper ore from the high-pressure grinding roll was agglomerated by using a drum, and then geopolymerization was used to cure the agglomerates. The effects of alkali activator composition and dosage, water content and metakaolin addition on particle size, compressive strength and acid resistance of agglomerates were studied. The mechanism of geopolymerization to improve the acid resistance of agglomerates was studied by FTIR and NMR measurements. The results show that alkali activator and water content will help to improve the particle size and acid resistance of agglomerates. It can be seen that reducing of sodium silicate content in the alkali activator results a lower acid tolerance. Adding suitable amount of sodium hydroxide the compressive strength of the agglomerates can be enhanced and their acid resistance can be significantly improved in the presence of metakaolin. FT-IR and NMR results indicate that the increase of geopolymer gels content is responsible for the enhancement of acid resistance of agglomerates.
Key words: low-grade copper ore; geopolymerization; agglomeration; acid resistance
