Fly ash beneficiation technology
Application of mineral processing technology to improve the comprehensive utilization value of fly ash Fly ash dressing According to the physical and chemical properties of various components in fly ash, it can be recovered by flotation, magnetic separation, electric selection, re-election and chemical beneficiation. 3.1 Recovery of 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. Iron 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 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 use of aluminum oxide and other scattered elements of ash 3.2 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. 4 Conclusion 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 method of beneficiation is adopted. The recovery and use of integrated plants is to solve the pollution and make resources of fly ash. The important direction. It is also an effective means to improve the utilization value of fly ash integrated platforms. Study more effective joint relaxation processes. For example, flotation-magnetic separation-re-election, flotation-de-sludge, flotation-super-segmentation and other joint processes are adopted. Choose from a variety of products with economic value from fly ash.
Silver-Copper Alloy has good electrical conductivity, fluidity and wettability, good mechanical properties, high hardness, wear resistance and resistance to fusion welding, with a tendency to segregation. It is melted in a vacuum medium frequency furnace, and the ingots can be cold processed into plates, sheets and wires after homogenization and annealing. Silver-copper alloy can be used as contact points for air circuit breakers, voltage controllers, telephone relays, contactors, starters and other devices, conductive rings and fixed contacts.
Silver Copper Alloy,Silver Copper Alloy Rod,Oxygen Free Silver Copper,Ofc Silver Copper Alloy Shandong Hitech Metal Material Co., Ltd , https://www.sdhitech.com