Powder coal fly ash beneficiation is based on the various physical components of different chemical nature, respectively flotation, magnetic separation, electrostatic separation, reselection and chemical processing methods such as recycling, be utilized.
How to recover iron from fly ash?
The iron in the fly ash mainly exists in the form of Fe2O3, Fe3O4 and iron silicate. The pyrite particles in the pulverized coal are enriched during combustion; after being subjected to magnetization, some of them become magnetite and Fe3O4 crystals. The x-diffraction analysis indicates that a large amount of Fe2O3 is contained in the interior, which is advantageous for the recovery of all iron.
And the recovery of iron in fly ash. Generally, the magnetic separation method is adopted, and the sorting effect is good.
For the content of total iron in the original fly ash slag, the pre-selection enrichment should be pre-selected, and the pre-selected equipment can be used with a hydrocyclone. For example, in a thermal power plant, the magnetite is more important than the original ash and slag. After pre-selection by the cyclone, the total iron in the fly ash slag from the sand discharge port is enriched. Its iron grade increased from 13.91% to 20.84%, and the recovery rate of total iron was 65.91%. The fly ash residue enriched in all iron was sorted by cylindrical weak magnetic concentrator, and the iron concentrate obtained was 45.22. %, the recovery rate was 39.17%.
The recovery of iron minerals from fly ash does not require stripping, mining, crushing, grinding and other sections, and its investment is only about 1/4 of the iron selected from the ore, thus saving a large number of infrastructure and operating expenses.
The magnetite selected from the fly ash can first be used as a raw material for firing the cement in the cement plant, and secondly can be incorporated into the iron ore with a higher iron content as the raw material for the iron making.
Recovery and Reuse of aluminum oxide, fly ash and other scattered elements of
Al2O3 in fly ash exists in the form of inactive aluminum-rich vitreous andalusite (3Al2O3·SiO2), which can be recovered by chemical beneficiation. For example, in the United States, acid leaching is used to obtain aluminum chloride from fly ash. Because fly ash has a large specific surface area, it has strong adsorption capacity and high polycondensation characteristics. In this case, the pulverized coal is likely to adsorb, reduce and enrich certain rare elements during the combustion to form fly ash. This opens up the possibility of recycling rare elements.
Fly ash as a new mineral resource. Its development and utilization prospects are very broad. A large number of research and practice at home and abroad. Use the appropriate beneficiation method. Comprehensive recovery and use. It is an important direction to solve the pollution and make resources of fly ash. It is also an effective means to improve the utilization value of fly ash integrated platforms.
Study more effective joint beneficiation processes. Such as the use of flotation - magnetic separation - re-election, flotation - de-sludge, flotation - super-segmentation and other joint processes. Choose from a variety of products with economic value from fly ash.
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