综合精品_淫语对白_亚洲一线二线在线观看_自偷自拍av_女m被主人虐玩调教91_青草精品视频_一乃葵在线_村上里沙在线观看_国产精品刺激_日韩精品视频免费_国产又黄又猛又粗_3d蒂法精品啪啪一区二区免费_日韩一本在线_奇米精品一区二区三区四区_日本三级黄色录像

PDF全文閱讀

王    歡 ¹   ,  翁金紅¹   ,  王嘉昊²   ,  馮    建 ¹   ,   劉娟紅²   ,  韓方暉²

( 1 . 安徽馬鋼礦業資源集團姑山礦業有限公司 ，安徽 馬鞍山 243000;

2. 北京科技大學 土木與資源工程學院 ，北京 100083)

摘   要 ：本文選取細粒級鐵尾礦粉，并加入改性劑對其進行改性，研究改性鐵尾礦粉的化學及礦物成分、細度 、燒失量 、需水量比及活性指數等相關性能，并與Ⅱ級粉煤灰性能進行比較，探究改性劑對鐵尾礦粉的改性效果和改性機理。研究結果表明：細粒級鐵尾礦粉的化學與礦物組成與粉煤灰相近，細粒級鐵尾礦粉＞45 μm 的顆粒含量為 17. 7% 、燒失量為 6. 5% 、改性后需水量比為 97. 2% ,  均滿足國家Ⅱ級粉煤灰相關標準 。堿類復合改性劑改性效果最好，改性鐵尾礦粉 3 d 、7 d 和 28 d 活性指數分別為 95. 6% 、95. 7%和 89. 3% ,  均高于Ⅱ級粉煤灰。隨著改性鐵尾礦粉比表面積增加，凈漿抗壓強度提高 。鐵尾礦粉經過改性處理后，界面處的 SiO₂ 中的硅氧鍵會出現重組現象，發生重聚反應，宏觀表現為抗壓強度的提高 。且鐵尾礦粉顆粒粒徑越小，這種重聚反應越顯著，抗壓強度的提升越明顯。

關鍵詞 ：鐵尾礦粉 ；粉煤灰 ；改性劑 ；強度 ；改性機理

中圖分類號 ：X752           

文獻標志碼 ：A           

文章編號 ：1005- 8249  (2023)   05- 0071- 06

DOI : 10. 19860/j . cnki . issn1005- 8249. 2023 . 05 . 012

WANG Huan ¹  ,  WENG Jinhong¹  ,  WANG Jiahao² ,  FENG Jian ¹  ;  LIU Juanhong² ,   HAN Fanghui²    

( 1 . Anhui Masteel Mining Resources Group Gushan Mining Co. ，Ltd . ,   Ma ′anshan 243000 ,   China;

2. School of Civil and Resource Engineering ,   University of Science and Technology Beijing ,   Beijing 100083 ,   China)

Abstract: In this paper, fine-grained iron tailings fines were selected and modified with modifiers. The chemical and mineral composition, fineness, burn-off, water demand ratio and activity index of the modified iron tailings powder were studied. The properties are compared with those of Class II fly ash to investigate the modification effect and modification mechanism of the modifier on the iron tailing powder. The results of the study show that the chemical and mineral composition of fine-grained iron tailings fines is similar to that of fly ash. The fine-grained iron tailings fines have a particle content of >45μm of 17.7% and a burn-off of 6.5%. The water demand ratio after modification was 97.2%, all of which met the relevant national standards for Class II fly ash. The best modification effect was achieved by the alkali composite modifier, with the activity index of modified iron tailing powder being 95.6%, 95.7% and 89.3% at 3d, 7d and 28d respectively, all of which were higher than that of Class II fly ash. As the specific surface area of modified iron tailing powder increased, the compressive strength of net slurry increased. After the modified iron tailing powder is treated, the silica-oxygen bonds in SiO2 at the interface will be reorganised and reunification reaction will occur, which is macroscopically manifested as an increase in compressive strength. The smaller the particle size of iron tailing powder, the more significant this reunification reaction is, and the more obvious the increase of compressive strength.

Keywords: iron tailings; fly ash; modifier; strength; modification mechanism

作者簡介 ：王歡  (1989—) ,  女 ，碩士研究生 ，高級工程師 ，研究方向 ：礦物加工工程。 

收稿日期 ：2022- 04- 08