Extracting iron powder from coal ash

Can it still be refined? It’s all burned up; it no longer has any reducing power, let alone the skeleton

Inner Mongolia Datang International Tuoketuo Power Generation Co., Ltd. generates 4 million tons of fly ash per year. Expert analysis revealed that the alumina content is close to 50%, the highest in the world, and its chemical composition corresponds to that of bauxite resources of intermediate grade. Since 2004, Datang International has collaborated with companies such as Fangsheng Environment to work on the research and development as well as industrial application of key technologies for the sustainable utilization of high-alumina coal ash. After more than 4 years of intensive research, two core technological routes have been developed, featuring independent intellectual property rights: one involves the use of high-alumina coal ash as raw material to produce aluminum-silicon alloys through electrothermal smelting, and the other involves the extraction of alumina from high-alumina coal ash while simultaneously producing silica products such as silica gel. Based on this, along with advanced industrial technologies, the **much-needed aluminum-silicon-titanium alloy material is ultimately produced.

A method for extracting alumina from fly ash: Fly ash, alumina, extraction, H2SO4 solution, γ-Al2O3, calcination and activation, heating reaction, activation technology, aluminum oxide, comprehensive utilization. [Abstract] A method for extracting alumina from fly ash involves grinding the fly ash and subjecting it to calcination and activation; thereafter, it is reacted with an H2SO4 solution under heat. The resulting alumina is dissolved in hot water, and after concentration and cooling, aluminum sulfate crystals are precipitated. By increasing the temperature to remove water, anhydrous aluminum sulfate is obtained; further heating leads to the decomposition of this substance to form γ-Al2O3, which can then be used to produce metallurgical-grade alumina. This invention employs a new fly ash activation technique; at normal pressure and without the use of any solvents, H2SO4 is sufficient to effectively leach aluminum oxide from fly ash, with a leaching rate of over 85%. This invention transforms fly ash into various types of aluminum salts and aluminum oxides, enabling the refined and comprehensive utilization of fly ash. For more, check patents.