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Method for recovering Pb<2+> from electrolytic zinc rinsing wastewater with calcium-carbonate-modified kieselguhr

A technology of diatomite and calcium carbonate, which is applied in chemical instruments and methods, water/sewage treatment, process efficiency improvement, etc., can solve the problem of small adsorption capacity of diatomite and achieve the effect of improving the recovery rate

Inactive Publication Date: 2013-06-19
GUILIN UNIVERSITY OF TECHNOLOGY
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  • Abstract
  • Description
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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 for recovering Pb&lt;2+&gt; from electrolytic zinc rinsing wastewater with calcium-carbonate-modified kieselguhr
  • Method for recovering Pb&lt;2+&gt; from electrolytic zinc rinsing wastewater with calcium-carbonate-modified kieselguhr

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Embodiment

[0013] (1) Take 10g of diatomaceous earth concentrate (after purification) and add it to 50 mL of Na with a concentration of 0.4mol / L 2 CO 3 solution, put it into a rotary constant temperature water bath shaker, stir at 25°C at 150r / min, slowly add 5mL of saturated CaCl dropwise 2 Continue to stir for 30 minutes and take it out, remove the upper layer solution, vacuum filter, then 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 calcium carbonate Modified diatomaceous earth adsorbent.

[0014] (2) Put 10 mL of the calcium carbonate modified diatomite adsorbent prepared in step (1) with a concentration of 0.1 g / L into a 250 mL conical flask with a stopper, and add 100 mL of Pb-containing 2+ The electrolytic zinc rinsing wastewater solution has an adsorption time of 120 minutes and an adsorption temperature of 25°C. After being covered, it is oscillated at a ...

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Abstract

The invention discloses a method for recovering Pb<2+> from electrolytic zinc rinsing wastewater with calcium-carbonate-modified kieselguhr, which comprises the following steps:(1) adding 10g of fine kieselguhr into 50mL of 0.4-0.5 mol / L Na2CO3 solution, putting in a rotary thermostatic water bath oscillator, stirring, and dropwisely adding 5-5.2 mL of saturated CaCl2; after stirring, taking out, removing the supernatant solution, carrying out vacuum filtration, washing with pure water to a neutral state, centrifuging for solid-liquid separation, drying, pulverizing, and passing through a 200-mesh sieve to prepare a calcium-carbonate-modified kieselguhr adsorbent; and (2) adding 10mL of 0.1 g / L calcium-carbonate-modified kieselguhr adsorbent prepared in the step (1) into a 250 mL a conical flask with a stopper, adding 100mL of Pb<2+>-containing electrolytic zinc rinsing wastewater solution with the pH value of 4.83-4.85, adsorbing at 25-30 DEG C for 120-125 minutes, plugging, and oscillating in the rotary thermostatic water bath oscillator at the speed of 150 r / min to adsorption equilibrium. The invention can be used for recovering Pb<2+> from electrolytic zinc rinsing wastewater, and enhances the recovery rate.

Description

technical field [0001] The invention relates to a method for recovering Pb from electrolytic zinc rinsing wastewater by using calcium carbonate 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 nece...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/28C02F1/62B01J20/14C22B7/00C22B13/00
CPCY02P10/20
Inventor 陈南春解庆林周海妙杨利姣高军
Owner GUILIN UNIVERSITY OF TECHNOLOGY
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