Method for extracting iron washed ore from fly ash or slag

Abstract

The invention relates to a method for the comprehensive utilization of fly ash and slag, in particular to a method for extracting the iron concentrate ore from the fly ash or the slag. The method comprises the technological processes as follows: a screening process of the iron concentrate ore in the fly ash or the slag, a flotation process of floating beads, a pre-desiliconization process, a technological process of white carbon black production, a technological process of alumina production and a technological process of cement production by adopting the slag. Since the element Fe in the fly ash or the slag is not uniformly distributed, the fly ash or the slag is ground by a ball mill so as to allow the extracted iron ore to meet certain requirements for the quality and the purity; and the purity of the iron ore can be further improved after dry magnetic separation of two levels. Moreover, after the iron concentrate ore is extracted, the floating beads, the white carbon black, alumina and joint cement can also be extracted from the fly ash or the slag organically and continuously step by step.

Description

【Technical field】 [0001] The invention relates to a resource utilization method of fly ash or slag, in particular to a method for extracting iron ore concentrate from fly ash or slag. 【Background technique】 [0002] Fly ash is a highly dispersed aggregate of solid particles. The chemical composition of fly ash or slag is related to the mineral composition of coal. The physical properties vary with coal types, boiler types, and combustion methods. The method adopts high-alumina fly ash or slag in western Inner Mongolia to extract iron ore. [0003] The iron in fly ash or slag is mainly composed of pyrite, hematite, siderite, limonite, etc., which constitute fine pellets of solid solution structure. Coal generally contains iron-containing minerals such as pyrite, marcasite, and cerulean, so its combustion products contain a certain amount of iron. Affected by the source, type and combustion status of coal, the amount of iron contained in fly ash or slag of different power pl...

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Problems solved by technology

[0004] In recent years, most of the research results of extracting useful resources from fly ash or slag at home and abroad are only of theoretical significance. The main reason for limiting the industrialization of these research results is that the research on the extraction of useful resources from fly ash or slag is not systematic. For example, Some study the extraction of alumina alone, some specialize in the extraction of silica, some specialize in the extraction of iron ore, some specialize in the extraction of carbon, and some specialize in the extraction of trace elements. Correlation and integration to make it a feasible overall solution makes the extraction cost high and it is difficult to carry out industrialization promotion

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