Method for recovering zinc ions in willemite ore wastewater
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A technology of zinc ions and ore, applied in the field of recovering zinc ions in willem ore wastewater, can solve the problems of low adsorption capacity, long adsorption time and high time cost, and achieve obvious economic benefits, high resin recovery rate and fast adsorption speed. Effect
Inactive Publication Date: 2016-01-13
ZHEJIANG GONGSHANG UNIVERSITY
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[0004] The ion exchange resin method has the above-mentioned advantages, but there is still a biggest defect, that is, the adsorption time of the existing methods is generally long, although the adsorption capacity can reach 200mg / g or even close to 300mg / g, but most of them need one to two days , the time cost is too high and the efficiency is low for the recovery of seriously polluted zinc
However, the current fast adsorption method generally does not have a high adsorption capacity, and the adsorption capacity can only hover at 70-80 mg / g, which cannot meet the demand.
And the treatment of silicon-zinc ore wastewater contains trace amounts of metal ions such as Fe and Mn. If it is discharged directly, it will cause environmental pollution
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Embodiment 1
[0030] (1) Accurately weigh 60.0 mg of chlorine balls, transfer them into a 100 mL three-necked bottle, add 40 mL of N,N-dimethylformamide (DMF) as a reaction solvent, and soak until the chlorine balls are fully swollen. Among them, the chlorine balls Macroporous cross-linked chloromethylated polystyrene beads;
[0031] (2) Add p-aminobenzoic acid (PABA) as a ligand in the obtained product of step (1), the reaction molar ratio of chlorine balls and p-aminobenzoic acid is 1:4, add catalyst, at 80 ℃ of reaction temperature Under nitrogen protection, the stirring reaction was carried out for 10 hours, and the rotating speed was 200r / min;
[0032] (3) After the reaction, filter the product of step (2) to obtain a filter cake, soak and wash the filter cake with N,N-dimethylformamide as the reaction solvent until the washing liquid is colorless, and then wash with distilled water , then soaked in NaOH aqueous solution, washed with water, then washed with absolute ethanol, acetone, ...
Embodiment 2
[0049] Experiment 1
[0050] Take by weighing 7 parts of 15.0mg synthetic resins obtained by the present invention and place them in iodine measuring bottles respectively, then add pH=3, pH=3.5, pH=4.0, pH=4.5, pH=5, pH= 5.5 and 25 mL of acetic acid-sodium acetate buffer solution with pH=6 were soaked in an iodine bottle for 24 hours, and then, an appropriate amount of prepared silicon-zinc ore wastewater was taken to make Zn 2+The concentration is 2mg / ml, then take 5mL of the solution, shake it at a constant temperature for 10 hours under the conditions of r=200r / min, T=298K, and measure the saturated adsorption capacity of the synthetic resin for metal zinc ions after the adsorption equilibrium.
[0051] Among them, the adsorption capacity (q e ) and distribution ratio (D):
[0052] q e = ( C 0 - C ...
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Abstract
The present invention discloses a method for recovering zinc ions in willemite ore wastewater. The method comprises: (1) soaking chlorine balls in N,N-dimethylformamide adopted as a reaction solvent until the chlorine balls completely swell; (2) adding p-aminobenzoic acid adopted as a ligand to the product obtained in the step (1), adding a catalyst, and at a reaction temperature of 80-120 DEG C, carrying out a heating stirring reaction for 10 min under nitrogen protection; (3) filtering the product obtained in the step (2) to obtain a filter cake, soaking and washing the filter cake with the N,N-dimethylformamide adopted as the reaction solvent until the washing liquid is colorless, washing with distilled water, soaking with a NaOH solution, washing with distilled water, and washing sequentially with absolute alcohol, acetone and diethyl ether, and carrying out vacuum drying at a temperature of 50 DEG C to obtain an adsorption function resin; and (4) accurately weighing 15 mg of the dried resin, adding an acetic acid-sodium acetate buffer solution, soaking overnight, taking 50-100 mL of a supernatant after the willemite ore wastewater naturally precipitates, adding the swelling resin and the remaining acetic acid-sodium acetate buffer solution, taking out the resin after 10 h, and washing with a 0.5-2 mol / L HCl, wherein the washed solution is the zinc ion solution.
Description
technical field [0001] The invention relates to resin preparation and application methods, in particular to a synthetic resin method with high efficiency recovery, good adsorption performance and reusability for treating zinc ions in silicon-zinc ore wastewater and a method for recovering zinc ions in silicon-zinc ore wastewater. Background technique [0002] With the continuous development of society, the development of industry is also making progress, followed by the treatment of various industrial wastewater. Now people are beginning to pay more and more attention to the impact of heavy metal pollution on human body and water ecology. Because heavy metal pollutants are difficult to degrade in the environment, they can be gradually enriched through the food chain, and finally accumulate in animals and plants, so that the concentration can increase hundreds of times. Many environmental pollution incidents are related to heavy metal pollution, which is the most harmful poll...
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