A method for resource recovery of high acid and high iron heavy metal wastewater

A technology for resource recovery and heavy metal, applied in the fields of metallurgical wastewater treatment, mining wastewater treatment, chemical instruments and methods, etc., can solve the problems of poor selectivity, large consumption of chemicals, low removal rate of heavy metal ions, etc. The effect of efficient concentration recovery, reduction of chemical consumption and sludge production

Active Publication Date: 2017-10-24
NANJING UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In view of the problems of low removal rate of heavy metal ions, poor selectivity, and large consumption of chemicals in the existing wastewater treatment methods, the present invention provides a method for recycling high-acid and high-iron heavy metal wastewater by separating resources. Method for efficiently separating and reclaiming heavy metal ions and iron salts in high-acid and high-iron wastewater by using highly selective acid-resistant chelating resin

Method used

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  • A method for resource recovery of high acid and high iron heavy metal wastewater
  • A method for resource recovery of high acid and high iron heavy metal wastewater
  • A method for resource recovery of high acid and high iron heavy metal wastewater

Examples

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Embodiment 1

[0027] A method for resource recovery of high-acid and high-iron heavy metal wastewater, the steps of which are:

[0028] (1) At first, the copper-containing (100mg / L) wastewater containing 20g / L ferric nitrate and a hydrogen ion concentration of 1mol / L is pumped into an adsorption column filled with 200mL strong base anion exchange resin (201×7 type), until When the effluent pH2 stop regeneration.

[0029] (2) then the above-mentioned high-iron heavy metal ion wastewater is passed through the acrylic aminopyridine chelating resin disclosed in 2015102049229 (resin in embodiment 4) that is equipped with 4mL resin A (Chinese patent application number is 2015102049229) C)) glass adsorption column ( 10×240mm), the adsorption temperature is controlled at 45°C, and the effluent is collected (the effluent after being adsorbed by resin A is low-concentration inorganic acid and high-concentration iron salt wastewater). When the concentration of heavy metals in the effluent reaches ...

Embodiment 2

[0036] A method for resource recovery of high-acid and high-iron heavy metal wastewater, the steps of which are:

[0037] (1) First, pump waste water containing 10g / L ferric sulfate and a hydrogen ion concentration of 5mol / L containing lead and zinc (both at a concentration of 50mg / L) into a 200mL strong base anion exchange resin (201×7 type) When the pH of the effluent is less than 1, stop pumping waste water and press out the resin void solution with an air compressor. The effluent after being adsorbed by anion exchange resin is high-iron heavy metal ion waste water, and then regenerate with clean water countercurrently to collect the regenerated solution. Stop regeneration when the regeneration water pH>2.

[0038] (2) then the above-mentioned high-iron heavy metal ion wastewater is passed through the acrylic aminopyridine chelating resin disclosed in 2015102049229 (resin in embodiment 4) that is equipped with 4mL resin A (Chinese patent application number is 2015102049229)...

Embodiment 3

[0041] A method for resource recovery of high-acid and high-iron heavy metal wastewater, the steps of which are:

[0042] (1) First, pump waste water containing 1g / L ferric chloride and a hydrogen ion concentration of 5mol / L containing copper, nickel, and zinc (both at a concentration of 150mg / L) into a 200mL strong base anion exchange resin (201× Type 4) adsorption column, stop pumping waste water when the effluent pH2.

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Abstract

The invention discloses a high-acidity high-iron heavy metal wastewater quality-divided resource recycling method, which belongs to the field of wastewater treatment and comprises the following steps: (1) performing acid adsorption to separate and recycle inorganic acid: pumping high-acidity high-iron heavy metal wastewater to be treated into an adsorption column filled with anion exchange resin to adsorb the inorganic acid in the wastewater; (2) selectively separating and extracting heavy metal by chelate resin: pumping effluent in step (1) into an absorption column filled with high-selectivity acid-resistant chelate resin which selectively intercepts various heavy metal ions such as lead, zinc, cadmium and the like, wherein the effluent only contains low-concentration inorganic acid and high-concentration ferric salt which can be used as raw materials for producing a water clarifying agent, thus realizing the quality-divided resource recycle and comprehensive use of the wastewater of such type. The method adopts a high-selectivity and low-energy consumption type special separation material and technology, realizes the quality-divided resource recycle of the high-acidity and high-iron heavy metal wastewater, is wide in applicable range and has significant environment and economic benefits.

Description

technical field [0001] The invention belongs to the field of wastewater treatment, and in particular relates to the treatment of high-acid and high-iron wastewater, and more specifically, relates to a method for recovering high-acid, high-iron and heavy metal wastewater by separating resources. Background technique [0002] High-acid and high-iron heavy metal wastewater generally comes from the processes of steel pickling, mineral mining and processing, among which the concentration of typical heavy metal ions such as copper, nickel, lead, cadmium and zinc is often as high as 50-150mg / L, and the acid concentration can reach 1- 10mol / L, the iron salt concentration is also as high as 10-20g / L. Conventional water treatment technologies such as neutralization precipitation, chemical precipitation, electrochemical method and bioremediation have shortcomings such as poor removal effect, large consumption of chemicals, and heavy secondary pollution. Emerging deep purification such ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/04C02F101/20C02F103/16C02F103/10
Inventor 刘福强陈达张小朋陶学文朱长青韦蒙蒙宗黎丹王栋白志平李爱民
Owner NANJING UNIV
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