Comprehensive utilization method for red mud

Abstract

The invention discloses a method for comprehensively utilizing red mud, comprising the following steps: chloridizing roasting, namely roasting the mixture of the red mud, coal and calcium chloride; cinder treatment, namely obtaining magnetic iron slag and non-magnetic slag after magnetic separation is carried out to levigated cinder, and then separating the magnetic iron slag and non-magnetic slag; adding calcined soda or oxalic acid after levigation liquid and wash water are rich in mischmetal due to cyclic use, and then precipitating mischmetal slag; treatment of dry dust and circulation liquid, namely, after dry powder for roasting dust collection is collected, mixing the dry powder with scouring water which is used for tail gas circulation and then leaching soluble ScCl3 and GaCl3; after filter pressing, precipitating scandium by adding oxalic acid crystal in filtrate; carrying out filter pressing again, precipitating gallium and Ti(OH)4 by adding ammonia into the filtrate, dissolving obtained gallium-titanium slag with acid and then using P2O4 extractant to extract the gallium; and using extractant to extract the scandium after scandium precipitate is dissolved by acid, carrying out precipitation again by adopting back-extraction acid dissolving, and obtaining Sc2O3 by means of roasting. The method can realize recovery of valuable metals from the red mud, and secondary residual slag is totally used for building material production; and the method has environment protection effects and economic benefits, plays an important role in the development of recycling economy and is applicable to enterprises generating red mud.

Description

technical field [0001] The invention relates to the production of metals, and also to the treatment of metallurgical wastes, and furthermore, to a method for extracting metals from waste red mud produced by alumina and realizing comprehensive utilization. Background technique [0002] The comprehensive utilization of red mud has done quite a lot of research at home and abroad, and some achievements have been made. However, most of the current methods are for single research on red mud. For example, the Chinese patent application No. 200710116152.8 "Method for Extracting Metal Scandium and Titanium from Red Mud" adopts red mud acid hydrolysis to extract scandium and titanium, which is based on the alumina plant process. The produced red mud is used as raw material. First, leaching the sodium and calcium in the red mud with hydrochloric acid with a concentration of 2% to 6% to increase the content of scandium and titanium in the red mud, and then using hydrochloric acid with a...

AI Technical Summary

Problems solved by technology

So far, there is no process report that can integrate multiple technologies to comprehensively recover most of the valuable metals in red mud and enable the effective utilization of a large amount of secondary residues, let alone related patent applications

Images