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Method for treating wastewater containing heavy metal ions through phase transformation of MgCO3.3H2O

A technology of heavy metal ions and magnesium carbonate trihydrate, which is applied in water/sewage treatment, adsorption water/sewage treatment, water/sludge/sewage treatment, etc., can solve the problem that sediments are difficult to be effectively treated, and achieve good filtration performance, Good wettability, simple and operable process

Active Publication Date: 2018-06-05
SHENYANG LIGONG UNIV
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Problems solved by technology

[0008] In view of the above-mentioned problems existing in the existing treatment technology of wastewater containing heavy metal ions, especially the problem that the sediment is difficult to be effectively treated after the wastewater containing heavy metal ions is treated by precipitation treatment, the present invention provides a method for treating wastewater containing heavy metal ions by phase transformation using magnesium carbonate trihydrate. The method of heavy metal ion waste water, by adding magnesium carbonate trihydrate to the to-be-treated Cr-containing 3+ , Pb 2+ 、Ni 2+ 、Cu 2+ , Zn 2+ 、Cd 2+ In the waste water of one or several heavy metals, the 414-type basic magnesium carbonate is formed by heating, stirring, standing and aging, and the Cr 3+ , Pb 2+ 、Ni 2+ 、Cu 2+ , Zn 2+ 、Cd 2+ Coarse carbonate or basic magnesium carbonate precipitates are formed, and the clear liquid and filter cake can be obtained by filtering and separating

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  • Method for treating wastewater containing heavy metal ions through phase transformation of MgCO3.3H2O

Examples

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Embodiment 1

[0039] A method for treating waste water containing heavy metal ions by phase transition of magnesium carbonate trihydrate, the flow chart of which is shown in figure 1 , including the following steps:

[0040] Step 1, the preparation of magnesium carbonate trihydrate

[0041] (1) Insulate magnesite at 750°C for 3.5 hours, and air-cool to room temperature to obtain highly active magnesium oxide;

[0042] (2) Using highly active magnesium oxide as a raw material, according to the solid-to-liquid ratio of 1:40, mix it with deionized water at 90°C, and hydrate at 60°C for 3.5h to obtain Mg(OH) 2 suspension.

[0043] (3) After cooling to room temperature, to Mg(OH) 2 0.16m in suspension 3 / L rate into CO 2 Gas, until the pH value of the solution is 7.3 to 7.8, stop the ventilation, and get heavy magnesium water Mg (HCO 3 ) 2 solution.

[0044] (4) the above-mentioned gained heavy magnesium water Mg (HCO 3 ) 2 The solution was stirred and reacted at 45° C. at a rate of 45...

Embodiment 2

[0057] A method for treating waste water containing heavy metal ions by phase transformation of magnesium carbonate trihydrate, comprising the following steps:

[0058] Step 1, the preparation of magnesium carbonate trihydrate

[0059] (1) Insulate magnesite at 750°C for 3.5 hours, and air-cool to room temperature to obtain highly active magnesium oxide;

[0060] (2) Using magnesium oxide as a raw material, according to the solid-to-liquid ratio of 1:40, mix it with deionized water at 90°C, and hydrate at 60°C for 3.5h to obtain Mg(OH) 2 suspension.

[0061] (3) After cooling to room temperature, to Mg(OH) 2 0.14m in suspension 3 / L rate into CO 2 Gas, until the pH value of the solution is 7.3 to 7.8, stop the ventilation, and get heavy magnesium water Mg (HCO 3 ) 2 solution.

[0062] (4) the above-mentioned gained heavy magnesium water Mg (HCO 3 ) 2 The solution was stirred and reacted at 50°C at a rate of 500r / min for 1.0h, the stirring was stopped, filtered, washed...

Embodiment 3

[0075] A method for treating waste water containing heavy metal ions by phase transformation of magnesium carbonate trihydrate, comprising the following steps:

[0076] Step 1, the preparation of magnesium carbonate trihydrate

[0077] (1) Insulate magnesite at 750°C for 3.5 hours, and air-cool to room temperature to obtain highly active magnesium oxide;

[0078](2) Using highly active magnesium oxide as a raw material, according to the solid-to-liquid ratio of 1:40, mix it with deionized water at 90°C, and hydrate at 60°C for 3.5h to obtain Mg(OH) 2 suspension.

[0079] (3) After cooling to room temperature, to Mg(OH) 2 0.12m in suspension 3 / L rate into CO 2 Gas, until the pH value of the solution is 7.3 to 7.8, stop the ventilation, and get heavy magnesium water Mg (HCO 3 ) 2 solution.

[0080] (4) the above-mentioned gained heavy magnesium water Mg (HCO 3 ) 2 The solution was stirred and reacted at 50°C at a rate of 300r / min for 1.5h, the stirring was stopped, fil...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/52C02F1/28C02F101/20C02F101/22
CPCC02F1/281C02F1/5245C02F2101/20C02F2101/22
Inventor 王余莲于洪浩李喜坤唐宏欣
Owner SHENYANG LIGONG UNIV
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