关键词: 煤矸石, 粉煤灰, 废弃物, 铝资源

Abstract:

To research the content and existence states of aluminum in gangues and fly ash, and to discuses the extraction possibility of aluminum oxide, and to increase the aluminum resource corresponding to make the use of solid wastes from coal fields, the compositions, constitutions and structures of gangues and fly ash from north side of Ordose basin were tested by chemical analysis, XRD, SEM and granularity distribution. The result is that the contents of aluminum oxide both in gangues and in fly ash are approximately or more than 40%, it is more than the industry grade of aluminum deposit. The aluminum of gangues is mainly in kaolinite and boehmitthe, the aluminum of OF ash is mainly in mollite, and the aluminum in CFB ash is mainly in the amorphous matters. At the same time CFB ash compare to OF ash has the character of smaller grain size and equality granularity, wadding grain form and high structure activity.  The conclusion is that the aluminum in CFB ash has high activation and can be extracted easily,the aluminum in gangues can be extracted when the gangues are baked, and the aluminum in OF ash can be extracted when it is activated by chemically methods. The problem of aluminum recourse shorting can be solved by the aluminum extracting of high aluminum solid wastes.

Key words: gangues, fly ash, wastes, aluminum resources