A method of preparing a C/gamma-Fe2O3 composite material from acid-regeneration desilication mud cakes

Abstract

A method of preparing a C / gamma-Fe2O3 composite material from acid-regeneration desilication mud cakes is disclosed. The method includes a) adding water into block desilication mud cakes, pulping under heating, and adding furfuryl alcohol, furfural or starch the mass of which is 2-5 times of that of the desilication mud cakes so as to form desilication mud slurry with food dispersity, b) subjecting the slurry in the step a) to spray drying at 100-120 DEG C to obtain coated desilication mud powder, and c) adding the desilication mud powder obtained in the step b) into a heating furnace, raising the temperature to 600-900 DEG C at a heating speed of 2-5 DEG C / min under inert gas protection, maintaining the temperature for 4-8 h after reaching the target temperature, and cooling inside the furnace to obtain the C / gamma-Fe2O3 composite material. The method of preparing the C / gamma-Fe2O3 composite material from the acid-regeneration desilication mud cakes is provided. The starch, the furfuryl alcohol or the furfural which are cheap are utilized for coating, and then thermal cracking is performed to obtain the magnetic carbon material. The method effectively achieves recovery and reutilization of resources.

Description

technical field [0001] The invention relates to a method for preparing a composite material, in particular to a method for preparing magnetic amorphous carbon C from industrial waste. Background technique [0002] Carbon materials are hydrophobic adsorbents that can still function in the presence of water or water vapor; carbon materials are not only suitable for absorbing land spills, but also for absorbing water spills; and when used for degreasing water, Will not sink after adsorption. Although carbon has many advantages, it has limitations in terms of adsorption capacity, ease of separation, and recyclability. [0003] At present, in the cold rolling process of silicon steel, due to the characteristics of fast pickling speed, good quality, and easy acid regeneration, hydrochloric acid pickling has become the mainstream technology in strip pickling. Since the steel itself contains more Si elements, the Si concentration in pickling waste acid will also increase significa...

AI Technical Summary

Problems solved by technology

This method is to produce iron oxide black, the added value of iron oxide black is not high, the production process is relatively large to environmental pollution, and the price of iron yellow crystal seeds that needs to be added is also relatively high, and the economy of the whole set of technology is not strong; in addition, the Chinese patent Application CN201210359797.5 also discloses a method for preparing superfine iron oxide red by using acid to regenerate desiliconized mud cake, which can use desiliconized mud cake as raw material to produce iron oxide red, which can be used in pigments, paints and other fields

What this method produces is iron oxide red, and the added value of iron oxide red is better, but the premise is that the purity meets the requirements, and at least high-purity iron oxide red above 99.3% can be used to produce soft magnetic materials. Iron oxide red, the silicon content of which cannot be controlled to the ppm level, such iron oxide red cannot be used to produce soft magnetic products, but can only be used for pigments and paints, which also has the problem of low economic efficiency

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