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Device for multistage selective removal of heavy metal ions in photovoltaic waste liquid and method thereof

A technology of heavy metal ions and metal ions, applied in chemical instruments and methods, neutralized water/sewage treatment, water/sewage multi-stage treatment, etc., can solve problems such as environmental pollution, inability to discharge directly, economic losses, etc. and the effect of high environmental benefits and reduced sewage treatment costs

Inactive Publication Date: 2020-06-05
SUZHOU KZONE EQUIP TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The current best technology for recovering nitric acid and hydrofluoric acid in waste mixed acid is diffusion dialysis, which has the advantages of high recovery rate of nitric acid and hydrofluoric acid, which can reach 80%~90%, and the recovery device occupies a small area and is easy to operate , and almost no energy consumption, but the disadvantage is that about the same volume of dialysate will be produced, and the dialysate contains about 90% of the metal ions in the original solution and about 10% to 20% of the acid
Because the metal ion content of this dialyzate is large and the pH is low, it cannot be discharged directly. It must be treated before it can be discharged to the plant, otherwise it will cause environmental pollution. At the same time, the loss of precious metals contained in the dialyzate will also bring Economic losses

Method used

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  • Device for multistage selective removal of heavy metal ions in photovoltaic waste liquid and method thereof

Examples

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Effect test

Embodiment 1

[0035] This example describes a multi-stage device for selectively removing heavy metal ions in photovoltaic waste liquid, which is used to treat the dialysis liquid after diffusion dialysis treatment of waste liquid produced by wet process black silicon, including the first A metal adsorption mechanism, a second metal adsorption mechanism and a third metal adsorption mechanism carry out adsorption and removal of different metal ions through the first metal adsorption mechanism, the second metal adsorption mechanism and the third metal adsorption mechanism respectively, and the first The metal adsorption mechanism, the second metal adsorption mechanism and the third metal adsorption mechanism are respectively provided with resin adsorption columns for selectively adsorbing corresponding metal ions.

[0036] Such as figure 1 As shown, the structures of the first metal adsorption mechanism, the second metal adsorption mechanism and the third metal adsorption mechanism are basica...

Embodiment 2

[0045] The present invention also provides a method for multi-stage selective removal of heavy metal ions in photovoltaic waste liquid, the method is based on the device described in Example 1, and is used to treat the waste liquid produced by wet process black silicon after diffusion dialysis The dialysate is processed, and the processing steps include:

[0046] The dialysate is transported to the first buffer tank 1 for pH adjustment. The first buffer tank 1 is a heatable and agitable reactor with a jacket. The temperature of the solution in the reactor is adjusted to 15-20°C. Take samples from the sampling port below the first buffer tank 1, measure the H+ concentration, calculate the amount of lye that needs to be added, such as NaOH or KOH, and adjust the pH to about 2~4. If the pH is greater than this range, dilute nitric acid can be added for adjustment. Here The adsorption rate of the first resin adsorption column 3 is relatively high at the pH value. Then the dialysa...

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Abstract

The invention relates to a device for multistage selective removal of heavy metal ions in photovoltaic waste liquid in a multi-stage selective manner and a method thereof. According to the device, a multi-stage metal adsorption mechanism is adopted-for selectively adsorbing and removing heavy metal ions in a dialysate and cleaning liquid; different acting forces between different metals and resinfunctional groups are utilized, different metal ions are directionally adsorbed and removed through different types of resin adsorption columns arranged in each stage of metal adsorption mechanism; after adsorption saturation, the surface of resin for adsorption is eluted through eluent, metal ions are recycled, and therefore metal reutilization is achieved, and particularly precious metal such asgold and silver is recycled. Meanwhile, due to selective adsorption of heavy metals, the removal rate of the heavy metals is up to 90% or above, and the step-by-step adjustment of the pH value of thewastewater is realized, so that the treated wastewater can reach the discharge standard, and the sewage treatment cost of enterprises is greatly reduced.

Description

technical field [0001] The invention relates to the technical field of environmental protection treatment, in particular to the technical field of waste liquid recovery and treatment, in particular to a device for multi-stage selective removal of heavy metal ions in silicon texturing wastewater. Background technique [0002] Wet black silicon technology uses gold, silver and other precious metal particles randomly attached to the surface of the silicon wafer as the cathode, and silicon as the anode. At the same time, a micro-electrochemical reaction channel is formed on the silicon surface, and the silicon substrate is rapidly etched under the metal particles to form a nanostructure. In the production process, KOH and HNO are also used in polishing, digging, desilvering and hole expansion 3 、H 2 o 2 , ammonia water, hydrofluoric acid and other chemical solvents, therefore, wet black silicon technology will generate a waste acid solution containing a large amount of silver ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F101/20C02F103/34
CPCC02F1/285C02F1/52C02F1/5281C02F1/66C02F9/00C02F2101/20C02F2103/346C02F2301/08C02F2303/16Y02P10/20
Inventor 蒋新赵会施利君屠金玲
Owner SUZHOU KZONE EQUIP TECH