With the development of society, solid waste, such as coal fly ash has caused serious environmental problems. Extraction of high value metals from coal fly ash is vital for sustainable development and maintenance of social economy. This work aimed to present a nonhazardous and efficient electrolysis method to extract selective iron products from coal fly ash leachate. Compared with current precipitation, biological, and organic extraction processes, this electrolysis method can selectively prepare different iron products. No chemicals or expensive membranes were used to prevent the introduction of pollutant and membrane limitations. Moreover, no waste was produced enabling realization of zero pollution discharge. Batch experiments indicated that the degree of reduction of iron can be controlled during the electrolysis process, thereby allowing for the production of different types of iron products. The purity of iron electrolytic product was 98.30 wt% Fe₂O₃, 1.35 wt% SO₃, and 0.09 wt% Al₂O₃, and current efficiency reached 60.3% under the optimal conditions: c (Fe²⁺) = 0.1 M, t = 4.0 h, and J = 2500 A/m². Different iron products like Fe₃O₄, FeOOH and Fe can be prepared sequentially during electrolysis process. Moreover, O₂ is generated on anode, and H₂ is generated on cathode as clean energy, which increases economic benefits. The wastewater (containing H₂SO₄) is widely used as a leaching reagent during leaching of coal fly ash, which can return to leaching process enabling zero hazardous substance discharge. This study would provide an alternative clean and efficient method for extracting selective iron products from coal fly ash leachate.

随着社会的发展，煤粉煤灰等固体废物已引起严重的环境问题。从粉煤灰中提取高价值金属对于可持续发展和维持社会经济至关重要。这项工作旨在提出一种从煤粉煤灰浸出液中提取选择性铁产品的无害且有效的电解方法。与目前的沉淀，生物和有机提取工艺相比，这种电解方法可以选择性地制备不同的铁产品。没有使用化学药品或昂贵的膜来防止污​​染物和膜的引入。而且，没有产生废物，实现了零污染排放。批量实验表明，在电解过程中可以控制铁的还原程度，从而允许生产不同类型的铁产品。铁电解产物的纯度为98.30 wt％Fe₂ Ó ₃，1.35％（重量）SO ₃，和0.09重量％的Al ₂ ö ₃，和电流效率在最佳条件下达到60.3％：Ç（铁²⁺）= 0.1M，吨 = 4.0小时，并Ĵ  = 2500甲/ m ²。可以在电解过程中依次制备不同的铁产品，如Fe ₃ O ₄，FeOOH和Fe。此外，作为清洁能源，在阳极上生成O ₂，在阴极上生成H ₂，从而提高了经济效益。废水（含H ₂ SO ₄）被广泛用作粉煤灰浸出过程中的浸出剂，可返回到浸出过程中以实现零有害物质排放。这项研究将提供一种从煤粉煤灰渗滤液中提取选择性铁产品的清洁，有效的替代方法。