Method for extracting ultra-fine ferric oxide by using waste slag

Abstract

The present invention provides a method of industrial residue recycle, especially a method of extracting superfine ferric oxide from waste residue. The technical solution is divided into three process of the method of extracting superfine ferric oxide from waste residue, firstly a detoxifcation process, adopting rotary kiln incineration and detoxifcation; secondly an extracting manufacturing ferric oxide, preparing iron oxide red by LAUX method; thirdly a process of preparing nanometer superfine ferric oxide, using chemical reaction method. The invention can produce beneficial results: a method of extracting superfine ferric oxide utilizing toxic waste residue ''chrome residue'' which being a material of extracting superfine ferric oxide, changing waste into valuable, and also utilzing industrial acid waste, protecting environment. The invention has a strong operability, complete detoxifcation, high economic value, evident predominance; the method is easy to control, the prepared nanometer iron oxide yellow has a small granularity, evenly distribution.

Description

Technical field: [0001] The invention relates to a method for reusing industrial waste residue, in particular to a method for extracting superfine iron oxide from waste residue. Background technique: [0002] Ultrafine iron oxide is a raw material for modern industry. Chromium slag is a kind of toxic industrial waste, and the focus of people's treatment of chromium slag is how to detoxify it. Most chromium slag treatment methods have poor operability, high cost, and inconspicuous economic benefits, and there are hidden dangers of incomplete detoxification by some methods. For example, the patent No.: CN 1030200A "method of using chromium slag instead of lime as slagging solvent", although the use of high temperature in detoxification can be thorough, it brings a lot of inconvenience to the smelting work in actual operation, not to mention the transfer of toxic chromium slag The smelting plant is under the threat of serious pollution from the transportation route to the sta...

AI Technical Summary

Problems solved by technology

Most chromium slag treatment methods have poor operability, high cost, and inconspicuous economic benefits, and there are hidden dangers that cannot be completely detoxified by some methods

For example, the patent No.: CN 1030200A "method of using chromium slag instead of lime as slagging solvent", although the use of high temperature in detoxification can be thorough, it brings a lot of inconvenience to the smelting work in actual operation, not to mention the transfer of toxic chromium slag The smelting plant is under the threat of serious pollution from the transportation route to the stacking site; the patent No.: 1040224A technology only regards chromium slag as a dispensable additive. It will be difficult to control a series of pollution diffusion until smelting, and its economic benefits are very uneconomical; the patent publication number is: CN 1038771A The chromium residue detoxification comprehensive utilization method is easy to produce Secondary pollution, there are certain hidden dangers

From the perspective of detoxification, the thermal detoxification method of chromium slag with the patent publication number of Shanghai Jiaotong University CN 101053908A is one direction, but the chemical composition of dewatered sludge in urban sewage treatment plants is complex and difficult to operate as an additive for detoxification, and chromium slag and dehydration Sludge belongs to hazardous waste residue, and there are strict requirements for transportation, stacking, and practical implementation; since chromium residue contains both water-soluble hexavalent chromium and water-insoluble hexavalent chromium, it is difficult to detoxify