Ecological synthetic utilization method of fly ash

Abstract

The invention relates to an ecological synthetic utilization method of fly ash, and the method has the following steps: (1) selecting fly ash which contains aluminum oxide, iron oxide and silicon oxide as a raw material, wherein the mass content of aluminum oxide, iron oxide and silicon oxide are respectively 20-45%, 10-40% and 30-50%, performing a fine grinding and then leaching; (2) filtering and separating to obtain a leaching solution and leaching residue; adding tributyl phosphate and a diluent in the leaching solution to extract, wherein aluminum enters in raffinate phase to form an aluminum chloride solution as well as iron enters in raffinate phase; (3) performing a liquid atomizing pyrolysis to aluminum chloride to obtain aluminum oxide; (4) using water as a re-extraction preparation in raffinate phase for carrying out a re-extraction, wherein iron enters in the re-extraction preparation to form an iron chloride solution; performing a liquid atomizing pyrolysis to iron chloride to obtain iron red. According to the invention, the valuable elements of aluminum, iron, silicon and the like in fly ash are synthetically utilized, the process flow is short and the operation is simple, so that the ecological synthetic utilization method realizes the synthetic utilization of all the valuable elements of aluminum, iron, silicon and the like in fly ash.

Description

technical field [0001] The invention relates to a processing method of fly ash, in particular to an ecological comprehensive utilization method of fly ash. Background technique [0002] Fly ash is a highly dispersed solid-phase aggregate, and its particle shape is mainly hollow microspheres in the amorphous phase, amorphous carbon particles, irregular glass bodies and other mineral debris. Except for a part of unburned fine carbon particles in the mineral assemblage, most of them are SiO 2 and Al 2 o 3 Generally, the mass content of alumina is 15-45%, the mass content of silicon oxide is 30-60%, and the mass content of iron oxide is 5%-40%. At present, my country's fly ash stockpile has exceeded 3 billion tons. The comprehensive utilization of fly ash can not only provide raw materials for the production of alumina and turn waste into treasure, but also effectively reduce environmental pollution and save the land occupied by stockpiling fly ash. Therefore, its market pro...

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Problems solved by technology

[0004] In the above several types of comprehensive utilization methods of fly ash, the energy consumption of lime sintering method is relatively high (the roasting temperature is higher at 1300 ℃), and the economic benefit is not good; Na 2 CO 3 Na in the sintering process 2 CO 3 The consumption is large and the technological process is complicated; the fluoride-assisted dissolution method has the disadvantages of large pollution and high equipment requirements; although the method of using fly ash to directly produce cement has a relatively simple technological process, this method cannot effectively utilize various components in the fly ash. Valuable element

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