齐大山铁尾矿制作人工鱼礁材料的研究

以齐大山铁尾矿为主要原料制备了人工鱼礁混凝土，并进行了性能与机理研究。结果表明，铁尾矿掺加量为70%的鱼礁混凝土，标准养护28 d的抗压强度达到47.3 MPa，抗折强度达到8.6 MPa；比表面积达到720 m²/kg的铁尾矿球磨细粉具有一定的火山灰活性，在人工鱼礁混凝土中能起到良好的活性粉末填充作用；人工鱼礁材料试块海水浸泡初期，表层有少量OH-溶出，使浸泡液pH值由新鲜海水的8.0升至8.5，但69 d后恢复到正常值；重金属离子溶出检测结果表明，浸泡试样的海水水质符合渔业水质国家标准。因此，大比例掺加齐大山铁尾矿制备的人工鱼礁混凝土不仅具有良好力学性能，还能满足人工鱼礁所要求的低碱、无污染要求，表现出了良好的海洋适应性，使大规模综合利用铁尾矿和海洋渔业增殖成为可能。

Investigation on Artificial Reefs Materials made From Qidashan Iron Tailings

The performance and mechanism of the concrete of artificial reefs preparedby Qidashan iron tailings as main raw materials were studied. The research showed that when the additional ratio of iron tailings was 70%，the compressive and flexible strength of concrete for 28 days of standard curing were up to 47.3 MPa and 8.6 MPa，respectively. The iron tailings powder with the specific surface of 720 m²/kg，has a certain of pozzolanic activity，which plays excellent filling effects in the concrete of artificial reefs. During the early period of seawater immersion of artificial reefs blocks，a small amount of OH- was dissolved out of the surface，resulting in the pH value of leaching solution rising from fresh seawater 8.0 to 8.5，but back to normal value after 69 d. Test results of heavy metal ion released indicated that the leaching solution could meet up the national water quality standard for fisheries. Hence，concrete of artificial reefs with high content of iron tailings not only have good mechanical performance，but also have low-alkali and non-pollution properties，which meet the demands of artificial reefs. It shows good marine adaptability，and makes comprehensive utilization of iron tailings and marine fishery proliferation possible.