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A combined control method of acid-resistant chelating resin for recovery of complex heavy metals by mass separation

A technology for chelating resins and heavy metals, applied in chemical instruments and methods, improvement of process efficiency, water/sludge/sewage treatment, etc., can solve the problems of inability to selectively separate and recycle heavy metals in multiple stages, and achieve reduction Treatment costs and environmental risks, efficient concentration and purification recovery, the effect of achieving zero discharge and resource utilization

Active Publication Date: 2019-04-12
南京华创环境技术研究院有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to solve the problem that the prior art cannot be multi-stage selectively separated and reclaimed various heavy metals in waste water in a strong acid environment, the present invention provides a method of combining and utilizing highly selective acid-resistant chelating resins to regulate the pH value (pH ≤3), improve the adsorption capacity and selectivity of different heavy metals, so as to realize the method of multi-stage separation and separation and recovery of complex heavy metal ions in strong acid wastewater

Method used

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  • A combined control method of acid-resistant chelating resin for recovery of complex heavy metals by mass separation
  • A combined control method of acid-resistant chelating resin for recovery of complex heavy metals by mass separation
  • A combined control method of acid-resistant chelating resin for recovery of complex heavy metals by mass separation

Examples

Experimental program
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Effect test

Embodiment 1

[0043] First, the wastewater containing copper, nickel and iron (both 50mg / L) with an initial pH value of 0.5 is pumped into the adsorption column filled with 5mL resin A The adsorption temperature is controlled at 20°C, the adsorption flow rate is 8BV / h, the effluent is collected and the pH value is adjusted to 1.2, and then pumped into the adsorption column filled with 5mL resin A The adsorption temperature was controlled at 20°C, the adsorption flow rate was 4BV / h, and the effluent was collected again. The chelating resin after selective adsorption of copper and nickel was desorbed and regenerated with 20% sulfuric acid and 10% hydrochloric acid respectively. The regeneration temperature was 20°C and the flow rate was 4BV / h. The desorbed and regenerated chelating resin is washed with water to neutrality and can be reused.

Embodiment 2

[0045] First, the wastewater containing copper, cobalt and iron (both 50mg / L) with an initial pH value of 0.8 is pumped into the adsorption column filled with 5mL resin A The adsorption temperature is controlled at 30°C, the adsorption flow rate is 6BV / h, the effluent is collected and the pH value is adjusted to 1.9, and then pumped into the adsorption column filled with 5mL resin B The adsorption temperature was controlled at 30°C, the adsorption flow rate was 5BV / h, and the effluent was collected again. The chelating resin after selective adsorption of copper and cobalt was desorbed and regenerated with 20% nitric acid and 10% hydrochloric acid respectively. The regeneration temperature was 40°C and the flow rate was 10BV / h. The desorbed and regenerated chelating resin is washed with water to neutrality and can be reused.

Embodiment 3

[0047] First, the wastewater containing copper, zinc and iron (both 50 mg / L) with an initial pH value of 1.1 is pumped into an adsorption column filled with 5 mL of resin A The adsorption temperature is controlled at 25°C, the adsorption flow rate is 3BV / h, the effluent is collected and the pH value is adjusted to 2.4, and then pumped into the adsorption column filled with 5mL resin B The adsorption temperature was controlled at 25°C, the adsorption flow rate was 3BV / h, and the effluent was collected again. The chelating resin after selective adsorption of copper and zinc was desorbed and regenerated with 10% sulfuric acid and 5% hydrochloric acid respectively. The regeneration temperature was 15°C and the flow rate was 1BV / h. The desorbed and regenerated chelating resin is washed with water to neutrality and can be reused.

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Abstract

The invention discloses an acid-resistant chelating resin combinational adjusting and controlling method for quality-divided recycling complex heavy metal, and belongs to the field of heavy metal wastewater resourceful treatment. The acid-resistant chelating resin combinational adjusting and controlling method for quality-divided recycling complex heavy metal comprises the following steps that strong acid wastewater with a plurality of heavy metals are sequentially pumped into an absorbing column which is filled with different kinds of acid-resistant chelating resin, by stair-stepped adjusting and controlling of the pH value (pH is smaller than or equal to 3) of the solution, multistage selective separation of a plurality of heavy metal ions such as copper, nickel, cobalt, zinc and iron can be achieved, treated water mainly contains molysite which can be used for producing the iron-based flocculating agent or water purifying agent; high concentrated regenerating liquid is obtained by adopting diluted acid to regenerate acid-resistant chelating resin, and high purity recycling can be achieve by technologies such as neutralization. According to the acid-resistant chelating resin combinational adjusting and controlling method for quality-divided recycling complex heavy metal, by stair-stepped adjusting and controlling of the pH value of wastewater and preferential combining of the acid-resistant chelating resin, selective separating and quality-divided recycling of the complex heavy metal in strong acid wastewater are realized, and remarkable environmental benefit and economic benefit are achieved.

Description

technical field [0001] The invention discloses an acid-resistant chelating resin combined control method for recovering complex heavy metals by quality separation, and belongs to the field of resource treatment of heavy metal wastewater. Background technique [0002] Most "heavy-related" industries generally use inorganic acids as raw materials, and acidic heavy metal wastewater exists widely. The acidic heavy metal wastewater produced by non-ferrous metal smelting, electroplating rinsing, and metal mining processes has a large amount of discharge and is highly harmful. A large amount of waste acid and washing water produced by the acid system are strongly acidic (pH ≤ 3), and often contain complex heavy metal ions such as copper, nickel, cobalt, zinc, and iron. Acidic heavy metal wastewater is more harmful than ordinary heavy metal wastewater because of its lower pH value and more heavy metal components. On the one hand, acidic wastewater has a strong corrosive effect, and...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B3/24C22B7/00C02F1/28C02F101/20
CPCC02F1/285C02F2101/20C22B3/24C22B7/006Y02P10/20
Inventor 刘福强宗黎丹仇欢张艳红赵伟凌晨李爱民
Owner 南京华创环境技术研究院有限公司
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