Method for removing high-concentration thallium-containing industrial wastewater by manganese ferrite

A manganese ferrite, high-concentration technology, applied in chemical instruments and methods, water pollutants, water/sewage treatment, etc., can solve the problems of poor treatment effect and high treatment cost of high-concentration thallium-containing wastewater, and achieve low preparation cost, The effect of efficient recycling and non-toxic price

Inactive Publication Date: 2019-03-08
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] In view of the problems existing in the prior art, the technical problem to be solved by the present invention is to provide a method for removing high-concentration industrial thallium-containing wastewater by using manganese ferrite, which can solve the problem of poor treatment effect and high treatment cost of existing high-concentration thallium-containing wastewater. High problem, heavy metal thallium can be recovered

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Artificially prepared thallium-containing wastewater: the thallium content is 20mg / L. The steps to treat this wastewater are as follows:

[0025] Step 1. Add 50mg / L of sodium hypochlorite to 2L of waste water, and stir for 10 minutes to partially oxidize the monovalent thallium in the water to trivalent thallium;

[0026] Step 2. Add 25mg / L nano-scale manganese ferrite adsorbent to the waste water, and the adsorption time is 30min. The manganese ferrite adsorbs trivalent thallium and monovalent thallium in the water;

[0027] Step 3, adding a magnetic field with a magnetic field strength of 2T around the waste water in step 2, the magnetic field suction time is 30min, the supernatant is the obtained treated water, and the waste water is separated from solid to liquid;

[0028] Step 4. After the solid-liquid separation in step 3, remove the magnetic field to take out the nano-scale manganese ferrite adsorbent solid, pour the sulfuric acid solution onto the manganese fer...

Embodiment 2

[0032] The difference between this embodiment and embodiment 1 is that in step 2, 17 mg / L nanometer manganese ferrite adsorbent is added.

[0033] As detected by an inductively coupled plasma mass spectrometer, the concentration of thallium in the effluent treated in this embodiment was 0.02 mg / L, the removal rate of thallium was 97.4%, and the mass percentage of thallium in the enriched and recovered thallium solution was 21.1%.

Embodiment 3

[0035] The difference between this embodiment and embodiment 1 is that in step 2, 10 mg / L nanometer manganese ferrite adsorbent is added.

[0036] The concentration of thallium in the effluent treated in this embodiment was 0.43 mg / L, the removal rate of thallium was 91.4%, and the mass percentage of thallium in the enriched and recovered thallium solution was 23.2% through detection by inductively coupled plasma mass spectrometer.

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Abstract

The invention discloses a method for removing high-concentration thallium-containing industrial wastewater by manganese ferrite. The method comprises the steps as follows: 1, adding an oxidizing agentto high-concentration thallium-containing wastewater, performing stirring and oxidizing part of univalent thallium in water into trivalent thallium; 2, adding nanoscale manganese ferrite or a nanoscale manganese ferrite adsorbent coated with humic acid to the wastewater obtained in the step 1 to adsorb trivalent thallium and univalent thallium in water; 3, applying a magnetic field around the wastewater obtained in the step 2, taking a supernatant as obtained treated water, and performing solid-liquid separation on the wastewater; 4, removing the magnetic field after solid-liquid separation in the step 3, taking out a nanoscale manganese ferrite adsorbent solid, and performing desorption to obtain an enriched recovered thallium solution and a regenerated nanoscale manganese ferrite adsorbent. The method has the advantages as follows: nanoscale manganese ferrite is convenient to produce and low in preparation cost and can be repeatedly recycled after being prepared once, and heavy metal thallium can be recovered efficiently.

Description

technical field [0001] The invention belongs to the technical field of environmental protection, and in particular relates to a method for removing high-concentration industrial thallium-containing wastewater by using manganese ferrite. Background technique [0002] The emission sources of thallium pollution mainly include natural and man-made emission sources. It is generally believed that 0.2-2ppm concentration of thallium will cause pollution, while the total content of thallium in the natural environment is very low, the concentration is as low as 1bbp, and high concentrations of thallium in some local areas will cause harm; such as thallium-containing minerals In the vicinity of sphalerite mines, in the exhaust gas after burning solid waste containing thallium. Low levels of thallium can cause serious harm to the ecosystem; thallium is extremely toxic to the human body, and thallium will inactivate the potassium ion transport pump protein on the cell membrane, disrupt ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/12C02F101/20
CPCC02F1/488C02F1/722C02F1/76C02F1/763C02F2101/20
Inventor 皇甫小留王海楠何强刘彩虹刘巨超邹依洁孙莉莉
Owner CHONGQING UNIV
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