Study more effective joint beneficiation processes. For example, flotation-magnetic separation-re-election, flotation-de-sludge, flotation-super-segmentation and other joint processes are adopted. Choose a variety of economic value products from coal ash powder.
Selected from fly ash magnet ore as a starting material may first be fired cement to cement plants, followed by a high iron grade can be incorporated as the iron ore feed.
Fly ash beneficiation is based on the physical and chemical properties of various components in fly ash. The useful minerals can be recovered by flotation, magnetic separation, electro-election, re-election and chemical beneficiation, respectively.
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. The Hainan fly ash beneficiation technology has strong adsorption capacity and high polycondensation characteristics due to its large specific surface area. 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.
How to recover iron from fly ash?
Features of disc tailings recovery machine: 1. The tailings recovery machine has large processing capacity, high recovery rate and low water consumption. Due to the composite magnetic system composed of technologies such as magnetism, the depth of the magnetic field around the disk is reached. The field strength is high and the gradient is large. Compared with other similar products, the recovery amount is 23 times. 2. The tailings recovery machine is easy to discharge and the magnetic block is not worn.
Recovery and Utilization of Alumina and Other Lean Elements in Fly Ash The iron in fly ash is mainly 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.
We provide the status of titanium ore flotation Hainan Hainan fly ash beneficiation technology news and information for you, and the iron in fly ash recycling. 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 to the original ash. After pre-selection by the cyclone, the total iron in the fly ash 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.
As a new mineral resource, fly ash has a broad prospect for development and utilization. A large number of researches and practices at home and abroad have proved that the use of suitable beneficiation methods and comprehensive recovery and utilization is the solution to the pollution and resources of fly ash. The important direction of the transformation. It is also an effective means to improve the utilization value of fly ash integrated platforms.
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