A kind of recycling method of nano-silver particle waste liquid

A technology of nano-silver particles and waste liquid, applied in the direction of improving process efficiency, can solve the problems of difficulty in separation and purification of nano-silver particles, and achieve the effect of eliminating special physical and chemical characteristics, reducing usage amount, and increasing usage rate.

Active Publication Date: 2022-01-18
珠海纳金科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, in the preparation process of nano-silver particles at home and abroad, the nano-silver particles remaining in the waste liquid are mainly below 30nm, because it is still difficult to separate and purify the nano-silver particles below 30nm in the current technology.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] A method for recycling nano-silver particle waste liquid, comprising:

[0044] The step of collecting waste liquid: Centrifuge 10L nano-silver particle stock solution in a centrifuge at 4000-7000r / mind for 30-60min. At this time, there will be obvious stratification in the centrifuge liquid. The bottom turbid liquid obtained 1.2L waste liquid;

[0045] Stirring step: Stir the waste liquid evenly, measure the solid content of the waste liquid, weigh the total weight of the waste liquid, and calculate the silver content in the waste liquid to be 20.1080g; the stirring speed is 100r / min, and the stirring time is 15min;

[0046] Reaction steps: put the waste liquid in a fume hood, add 20mL of ammonia water with a concentration of 5% while stirring, stir after adding the ammonia water, the stirring speed is 100r / min, the stirring time is 15min, and then stand for 2 days to obtain Reaction solution; Wherein, the mass volume ratio of the silver in the waste liquid and ammonia...

Embodiment 2

[0052] A method for recycling nano-silver particle waste liquid, comprising:

[0053] The step of collecting waste liquid: Centrifuge 10L nano-silver particle stock solution in a centrifuge at 4000-7000r / mind for 30-60min. At this time, there will be obvious stratification in the centrifuge liquid. The bottom turbid liquid obtained 1.2L waste liquid;

[0054] Stirring step: Stir the waste liquid evenly, measure the solid content of the waste liquid, weigh the total weight of the waste liquid, and calculate the silver content in the waste liquid to be 8.2711g; the stirring speed is 300r / min, and the stirring time is 5min; ;

[0055] Reaction steps: put the waste liquid in a fume hood, add 30mL of ammonia water with a concentration of 5% while stirring, stir after adding the ammonia water, the stirring speed is 100r / min, the stirring time is 10min, and then stand for 1 day to obtain Reaction liquid; Wherein, the mass volume ratio of the silver in waste liquid and ammoniacal li...

Embodiment 3

[0061] A method for recycling nano-silver particle waste liquid, comprising:

[0062] The step of collecting waste liquid: Centrifuge 10L nano-silver particle stock solution in a centrifuge at 4000-7000r / mind for 30-60min. At this time, there will be obvious stratification in the centrifuge liquid. The bottom turbid liquid obtained 1.2L waste liquid;

[0063] Stirring step: Stir the waste liquid evenly, measure the solid content of the waste liquid, weigh the total weight of the waste liquid, and calculate the silver content in the waste liquid to be 7.5900g; the stirring speed is 300r / min, and the stirring time is 5min; ;

[0064] Reaction steps: put the waste liquid in a fume hood, add 30mL of ammonia water with a concentration of 5% while stirring, stir after adding the ammonia water, the stirring speed is 200r / min, the stirring time is 10min, and then stand for 2 days to obtain Reaction liquid; Wherein, the mass volume ratio of the silver in waste liquid and ammoniacal l...

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PUM

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Abstract

The invention discloses a recycling method of nano-silver particle waste liquid, comprising: collecting the waste liquid: performing centrifugation on the original liquid of nano-silver particle, pouring off the clarified liquid in the upper layer, and collecting the turbid liquid in the middle and bottom layers to obtain the waste liquid; Stirring steps: stir the waste liquid evenly, calculate the silver content in the waste liquid; reaction steps: place the waste liquid in a fume hood, add the ammoniacal liquor with a concentration of 5% while stirring, stir after adding the ammoniacal liquor, and then standing still to obtain a reaction solution; centrifugation step: centrifuging the reaction solution to obtain a centrifuge; drying step: drying the centrifugation solution to obtain silver nuggets; grinding step: grinding and pulverizing the silver nuggets to obtain micron silver particles. The invention can simply and effectively recycle the silver in the nano-silver particle waste liquid, reduce the waste of silver, avoid pollution to the environment, and at the same time greatly reduce the use of oxidants such as hydrogen peroxide, and has high recovery rate and low cost And easy to operate features.

Description

technical field [0001] The invention relates to a method for recycling resources, in particular to a method for recycling nano silver particle waste liquid. Background technique [0002] The recycling of nano-silver particle waste liquid refers to the recovery of the main component in the waste liquid-nano-silver particle after a certain treatment of a large amount of waste liquid generated in the process of purification and extraction of nano-silver particles. The treated nano-silver aggregates into irregular aggregates with a particle size of micron or above, and the recovered silver nuggets are then ground and pulverized into micron silver particles. Micron silver particles are silver particles whose particle diameter is at the micron level, which has a long-lasting antibacterial effect and is suitable for personal care, medical, pharmaceutical and animal health products and other fields. [0003] We know the rapid development of nanomaterial technology and its wide appl...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F9/04C22B7/00C22B11/02
CPCC22B7/005C22B11/021B22F9/04Y02P10/20
Inventor 雷震陈昌协余雪玲
Owner 珠海纳金科技有限公司
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