Method for preparing heavy metal ion adsorbent by using fly ash aluminum extraction slag

Abstract

The invention provides a method for preparing a heavy metal ion adsorbent by using fly ash extracted aluminum slag, which comprises the following steps: 1) burdening: mixing the fly ash extracted aluminum slag, a structure inducer and a dilute alkali solution together and adding into a reactor, 2) reaction: adding the mixed slurry obtained in the step 1) into a closed reactor and carrying out dynamic hydrothermal reaction; 3) filtration: carrying out suction filtration on the slurry obtained after the reaction in the step 2) to obtain a filter cake; and 4) washing and drying: washing the filter cake obtained in the step 3) with water and ethanol for three times respectively, and drying the filter cake to obtain the mesoporous tobermorite. According to the method, the mesoporous tobermorite is prepared from the aluminum extraction slag obtained after aluminum oxide is extracted through a fly ash wet alkali method, and the mesoporous tobermorite has good adsorption performance on heavy metal ions in waste water, is high in adsorption capacity on Pb < 2 + > and Cd < 2 + >, and particularly is high in adsorption rate and removal rate on Pb < 2 + >; besides, the raw materials are solid wastes, other siliceous or calcareous raw materials do not need to be added, and the method is simple, economical and feasible.

Description

technical field [0001] The invention relates to the field of solid waste reuse, in particular to a method for preparing a heavy metal ion adsorbent by using fly ash to extract aluminum slag. Background technique [0002] The annual production of high-alumina fly ash in my country is more than 25 million tons, which seriously occupies land and pollutes the environment, and urgently needs to be developed and utilized. The use of high-alumina fly ash to extract alumina is of great significance to the healthy development of my country's aluminum industry and environmental protection, and has received widespread attention. At present, the technologies for extracting alumina from fly ash mainly include sintering method, acid method, ammonium sulfate method, alkali wet method and so on. Among them, the alkali wet method (CN201010565571.1 and CN201510164903.8) has relatively mild process conditions, and the alumina extraction rate is high, reaching more than 90%. It not only avoids...

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Problems solved by technology

[0004] The object of the present invention is to provide a kind of method that utilizes fly ash to extract aluminum slag to prepare heavy metal ion adsorbent, the mesoporous tobermullite that utilizes this method to obtain has good adsorption performance to the heavy metal ion in waste water, especially to Pb 2+ and Cd 2+ The adsorption capacity reaches 338.98 mg / g and 105.37 mg / g respectively, which can alleviate the environmental pollution caused by the aluminum extraction slag and heavy metal ion wastewater produced by the high aluminum fly ash wet extraction process

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