Iron-containing red mud recycling method, rock wool preparation method and corresponding rock wool

Abstract

The invention provides an iron-containing red mud recycling method, a rock wool preparation method and corresponding rock wool. With the iron-containing red mud recycling method, iron-containing red mud can be recycled on a large scale with high efficiency and low energy consumption. The rock wool preparation method is used for producing rock wool by using hot slag as the raw material, wherein thehot slag is recycled by utilizing the iron-containing red mud recycling method. The rock wool is correspondingly obtained with the rock wool preparation method. The iron-containing red mud recyclingmethod comprises the following steps of first, pretreatment, wherein materials subjected to pretreatment is obtained after the iron-containing red mud is pretreated; second, reduction and recycling treatment, wherein reduction treatment is carried out on the pretreated materials at a high temperature so that reduced materials can be obtained after reduction and recycling are carried out on the pretreated materials; third, melting separation treatment, wherein high-temperature melting is carried out on reduced materials obtained after treatment so that the reduced materials are layered according to different specific gravities to be separated so as to be recycled respectively, and molten iron and hot slag are obtained. In the second step, gas is adopted as the fuel for heating, reduction treatment is carried out on iron in iron oxide and sodium in sodium oxide, the sodium obtained through reduction is subjected to recycling treatment in the form of vapor, and the part, not recycled, ofthe materials are the material residues after reduction treatment.

Description

technical field [0001] The invention belongs to the field of resource utilization of industrial solid waste, and specifically relates to a method for recovering iron-containing red mud capable of large-scale and high-efficiency recovery of iron-containing red mud, and a rock wool preparation method for producing rock wool by using the recovered hot slag as a raw material and Correspondingly obtained rock wool. Background technique [0002] At present, the relatively mature application of red mud resources is to add a small amount to iron concentrate powder as a binder, or to make ceramsite or to recover the iron in it through iron selection, but due to the characteristics of red mud and the scale of process equipment and market demand, etc., can only be applied on a small scale and in a small amount. For the red mud with a stock of more than 200 million tons and an annual increase of tens of millions of tons, it cannot solve the fundamental problem. [0003] Although there...

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Problems solved by technology

[0003] Although there are some recovery methods that use iron-containing red mud to prepare rock wool, due to its technological characteristics, the reduction reaction is completed at the same time as the melting treatment, so there are problems of high energy consumption and cost and low recovery efficiency.

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