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Method of recovering Pb<2+> from electrolytic zinc rinsing waste water by using manganese oxide modified diatomite

A technology of diatomite and manganese oxide, applied in chemical instruments and methods, metallurgical wastewater treatment, water/sewage treatment, etc., can solve the problems of small adsorption capacity of diatomite, and achieve the effect of high recovery rate and simple process

Inactive Publication Date: 2013-04-10
GUILIN UNIVERSITY OF TECHNOLOGY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the natural diatomite has a small adsorption capacity, and it is often necessary to modify the diatomite

Method used

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  • Method of recovering Pb&lt;2+&gt; from electrolytic zinc rinsing waste water by using manganese oxide modified diatomite
  • Method of recovering Pb&lt;2+&gt; from electrolytic zinc rinsing waste water by using manganese oxide modified diatomite

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Embodiment

[0016] (1) Take 15g of purified diatomaceous earth and add it to 50 mL of NaOH solution with a concentration of 4mol / L, shake at 90°C for 100 minutes, then remove the upper layer solution, and then add 100mL of MnCl with a concentration of 2mol / L 2 The solution was adjusted to pH 1.5 with analytical pure HCl, left to stand for 120 minutes, stirred for 60 minutes, then left to stand for 24 hours, and the supernatant was removed.

[0017] (2) Add 25 mL of MnCl with a concentration of 2 mol / L to the resultant of step (1) 2 The solution was stirred and allowed to stand.

[0018] (3) Repeat the operation process of step (2), remove the supernatant, wash with pure water until neutral, centrifuge to separate the solid from the liquid, take the solid and dry it at 105°C, crush it through a 200-mesh sieve, and prepare the adsorbent Manganese oxide modified diatomaceous earth.

[0019] (4) Put 0.1g of the adsorbent manganese oxide modified diatomite obtained in step (3) into a 250mL c...

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Abstract

The invention discloses a method of recovering Pb<2+> from electrolytic zinc rinsing waste water by using manganese oxide modified diatomite. The method comprises the steps that (1), refined purified diatomite is taken, added to an NaOH solution, vibrated at 90-95 DEG C for 100-120 minutes, subjected to upper layer solution removal, added with an MnCl2 solution, placed for 120 minutes after a pH value is adjusted to 1-2 with analytical pure HCl, stirred for 60 minutes, then placed for 24 hours, and subjected to supernate removal; (2), the MnCl2 solution is added to a substance obtained in Step (1), stirred and placed; (3), operational processes in Step (2) are repeated; supernate is removed; the substance is washed to be neutral with pure water; centrifugation is performed for solid-liquid separation; solid is taken, dried and smashed; the manganese oxide modified diatomite is prepared; and (4), the manganese oxide modified diatomite is added to a 100mL Pb<2+> electrolytic zinc rinsing waste water solution, adsorbed at 25-30 DEG C for 80-85 minutes, subjected to capping, and then vibrated in a rotary water-bath constant-temperature vibrator at 200r / min till adsorption equilibrium is achieved. The method is simple in technology, and the recovery rate of Pb<2+> is high.

Description

technical field [0001] The invention relates to a method for recovering Pb from electrolytic zinc rinsing wastewater by using manganese oxide modified diatomite 2+ Methods. Background technique [0002] Contains heavy metal Pb 2+ The waste water mainly comes from metallurgy, electroplating, battery and solid waste landfill leachate. Wastewater of heavy metal ions discharged into the environment can only change its form or be transferred, diluted and accumulated, but cannot be degraded, so it is extremely harmful. Lead and its compounds have toxic effects on many systems of the human body, which can damage the central brain and peripheral nervous system, cause myocardial damage, and affect the function of the digestive system. [0003] Diatomaceous earth is a kind of biogenic siliceous sedimentary rock, which is mainly composed of diatom remains through silicification and consolidation. However, the natural diatomite has a small adsorption capacity, and it is often necess...

Claims

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Application Information

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IPC IPC(8): C02F1/28C02F1/62C22B7/00C22B13/00C02F103/16
Inventor 周海妙解庆林陈南春杨利姣高军
Owner GUILIN UNIVERSITY OF TECHNOLOGY
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