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A method and application for preparing formaldehyde gas-sensing material based on modification of tin sludge in tin plating process

A formaldehyde gas and tin slime technology, applied in material resistance, material analysis, material analysis by electromagnetic means, etc., can solve problems such as high economic cost, waste of tin resources, environmental pollution, etc. Emission treatment cost and effect of alleviating the loss of tin resources

Active Publication Date: 2020-10-27
NORTHEASTERN UNIV LIAONING +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a method and application for preparing formaldehyde gas-sensitive materials based on the modification of tin sludge in the tin plating process. The waste tin sludge produced in the production process of tin plating is acidified and activated, washed and filtered, dehydrated and dried. agent; precious metal doping; after sintering treatment; then mixed with a certain amount of solvent to form a uniform slurry coated on Al 2 o 3 The surface of the ceramic tube is heat-treated and aged to make a formaldehyde gas sensor, which not only solves the problems of serious waste of tin resources, high economic costs for enterprises, and serious environmental pollution, but also comprehensively utilizes in the field of formaldehyde gas-sensing materials

Method used

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  • A method and application for preparing formaldehyde gas-sensing material based on modification of tin sludge in tin plating process
  • A method and application for preparing formaldehyde gas-sensing material based on modification of tin sludge in tin plating process

Examples

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Effect test

Embodiment 1

[0030] Take 2g of the tin sludge in the electroplating bath filtered out in large-scale industrial production and dissolve it in 30ml of 40% nitric acid, stir it magnetically for 30min at a water bath temperature of 40°C for activation treatment, then suction filter the liquid, and filter the residue Continue to dissolve in 30ml deionized water, wash under magnetic stirring, and repeat suction filtration and washing three times. Then, the filter residue washed for the third time was dissolved in 30 ml of absolute ethanol and washed three times under magnetic stirring, and the product after suction filtration was dried in an oven at 60° C. for 12 hours. Grind the dried sample into a uniform powder in an agate mortar, and dissolve it in 40mlV under vigorous stirring. 水 :V 无水乙醇 = In the 1:1 mixed solution, add 0.5g PVP as a protective agent to the above solution at a water bath temperature of 60°C, and then add AgNO at a doping mass ratio of 1%. 3 solution and 0.1g ascorbic aci...

Embodiment 2

[0036]Take 2g of the tin sludge in the electroplating bath filtered out in large-scale industrial production and dissolve it in 30ml of 40% nitric acid, stir it magnetically for 30min at a water bath temperature of 40°C for activation treatment, then suction filter the liquid, and filter the residue Continue to dissolve in 30ml deionized water, wash under magnetic stirring, and repeat suction filtration and washing three times. Then, the filter residue washed for the third time was dissolved in 30 ml of absolute ethanol and washed three times under magnetic stirring, and the product after suction filtration was dried in an oven at 60° C. for 12 hours. Grind the dried sample into a uniform powder in an agate mortar, and dissolve it in 40mlV under vigorous stirring. 水 :V 无水乙醇 = In the 1:1 mixed solution, add 0.5g PVP as a protective agent to the above solution at a water bath temperature of 50°C, and then add AgNO according to the doping mass ratio of 2%. 3 solution and 0.1g a...

Embodiment 3

[0040] Take 2g of the tin sludge in the electroplating bath filtered out in large-scale industrial production and dissolve it in 30ml of 40% nitric acid, stir it magnetically for 30min at a water bath temperature of 40°C for activation treatment, then suction filter the liquid, and filter the residue Continue to dissolve in 30ml deionized water, wash under magnetic stirring, and repeat suction filtration and washing three times. Then, the filter residue washed for the third time was dissolved in 30 ml of absolute ethanol and washed three times under magnetic stirring, and the product after suction filtration was dried in an oven at 60° C. for 12 hours. Grind the dried sample into a uniform powder in an agate mortar, and dissolve it in 40mlV under vigorous stirring. 水 :V 无水乙醇 = In the 1:1 mixed solution, add 0.5g PVP as a protective agent to the above solution at a water bath temperature of 60°C, and then add HPtCl according to the doping mass ratio of 1%. 6 solution and 0.1g...

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Abstract

The invention belongs to the fields of comprehensive recycling and utilization of industrial waste tin, environmental protection and semiconductor oxide formaldehyde gas-sensitive sensors, and relates to a method and application of preparing formaldehyde gas-sensitive materials based on the modification of tin mud in the tin plating process. The formaldehyde gas-sensitive material of the present invention is obtained from the waste tin sludge existing at the bottom of the plating tank on the tin plating production line through acidification activation, washing and drying, noble metal doping and subsequent heat treatment. The manufactured gas sensor has excellent gas-sensing properties such as high sensitivity, fast response and recovery speed to formaldehyde. It achieves effective and rational utilization of tin resources, reduces economic costs, and reduces environmental pollution caused by waste. It is an environmentally friendly preparation method.

Description

technical field [0001] The invention belongs to the field of comprehensive recovery and utilization of industrial waste tin, environmental protection and semiconductor oxide formaldehyde gas sensor, in particular to the modification treatment of tin sludge in the tin plating process and the preparation of the gas sensor for detecting formaldehyde. Background technique [0002] In the electroplating solution of tin plating on the tinning production line of Baosteel Cold Rolling Sheet Factory, Sn is added to the plating solution through a special tin melting system. 2+ , in conventional continuous industrial production, Sn 2+ Oxidized to Sn 4+ , Sn 4+ with SnO 2 The form exists in the bottom of the plating tank to form a large amount of tin sludge. It is a by-product of industrial waste, and the annual discharge of enterprises is about tens of tons. However, tin is a scarce resource, and the discharge of tin sludge means a large loss of tin resources and high economic pro...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N27/12
CPCG01N27/125
Inventor 于慧敏李建中尹远洪付玉
Owner NORTHEASTERN UNIV LIAONING
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