Method for treating waste water containing heavy metal ions by phase transformation of magnesium carbonate trihydrate

Abstract

The invention provides a method for treating wastewater containing heavy metal ions through phase transformation of MgCO3.3H2O, and belongs to the technical field of wastewater treatment. The method comprises the following steps: taking wastewater solution containing heavy metal ions, regulating the temperature to 50-60 DEG C, regulating the pH value to 4-8, adding MgCO3.3H2O into the wastewater solution containing the heavy metal ions, and oscillating the solution at constant temperature, so as to obtain wastewater turbid liquid containing the heavy metal ions; heating the wastewater turbid liquid to 55-90 DEG C, stirring at constant temperature for 30-90min, standing, aging, and filtering obtained mixed solution containing precipitation, so as to obtain clear liquid and a filter cake, wherein the mass ratio of MgCO3.3H2O to the heavy metal ions is (4-50):(0.01-1); the heavy metal ion(s) is / are one or more heavy metal ions of Cr<3+>, Pb<2+>, Ni<2+>, Cu<2+>, Zn<2+> and Cd<2+>. According to the method, the wastewater containing the heavy metal ions is treated, the treatment cost is lowered, and the secondary resource recycling of heavy metals can be realized.

Description

technical field

[0001] The invention belongs to the technical field of wastewater treatment, and in particular relates to a method for treating wastewater containing heavy metal ions by phase transition of magnesium carbonate trihydrate. Background technique

[0002] Heavy metal wastewater widely exists in various sectors of national economic production, such as chemical production, electronic component production, metal smelting, mining, etc. Heavy metal pollution has the characteristics of earth circulation and long-lasting harm. Once it enters the ecological cycle, it will pose a great threat to human survival and health. Heavy metal pollutants can accumulate in the human body along the food chain, causing great harm to ecological security and human health. Some of these pollutants are more mutagenic and "three-cause" hazards. After effective separation and purification treatment.

[0003] At present, the treatment technologies of heavy metal wastewater can be roughly d...

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