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Method for measuring free lead in lead-acid battery green plate sample

A lead-acid battery and a measurement method technology, applied in the preparation of test samples, analysis by making materials undergo chemical reactions, and material analysis by observing the impact on chemical indicators, can solve the problem of large errors in free lead loss, There are many steps to achieve the effect of reducing losses, simplifying steps and reducing reagents

Inactive Publication Date: 2012-04-25
CHONGQING WANLI NEW ENERGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, traditional methods are not effective in removing PbO, PbO 2 and PbSO 4 When using two kinds of reagent solutions, there are many steps, and the error of the loss of free lead in the sample is relatively large during the operation process.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] (1) Accurately weigh 1g of the raw plate sample into a 100ml beaker.

[0019] (2) Add excess ammonium acetate solution with a concentration of 35%, heat until fully dissolved, remove and cool, discard the clear liquid, and finally wash with distilled water, and repeat this several times.

[0020] (3) Add nitric acid solution to the residue until completely dissolved, HNO 3 The solution was prepared as concentrated HNO 3 with H 2 The volume ratio of O is 1:1. After the dissolution is complete, transfer it into a 250mL Erlenmeyer flask.

[0021] (4) Adjust the pH to 5-6, add 20% hexamethylenetetramine solution, 2 drops of xylenol orange indicator solution, shake well, and titrate with 0.01mol / L EDTA standard solution until the color of the solution changes from purple to purple. The red color changes to bright yellow as the end point, and the recorded volume is 3.85 mL.

[0022] (5) The titer of the EDTA standard solution to Pb is T, c is the concentration of the EDTA...

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PUM

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Abstract

The invention discloses a method for measuring free lead in a lead-acid battery green plate sample. The method comprises: conducting sampling from a green plate, carrying out weighing, and adding the sample into an ammonium acetate solution till fully dissolved, removing the clear liquid, then adding the obtained product into a nitric acid solution till fully dissolved, adjusting the pH of the solution, adding a hexamethylene tetramine solution, dripping a xylenol orange indicating liquid into the mixed solution, and shaking it well, performing titration with an EDTA (ethylene diamine tetraacetic acid) solution till the solution turns from purple red into bright yellow, taking down the volume of the used EDTA solution, and calculating the titer of the EDTA solution to Pb (plumbum) according to the concentration of the EDTA solution, then calculating the Pb content in the original sample. The method of the invention simplifies the steps of a free lead measuring method, reduces the reagents consumed, and lowers the loss of the target object free lead.

Description

Technical field [0001] The invention belongs to the field of lead-acid batteries, and specifically relates to a method for measuring free lead in lead-acid battery green plate samples. Background technique [0002] In the production process of lead-acid batteries, the content of free lead is one of the main control parameters of the green plate. Excessive free lead content in the green plate will affect the performance of the lead-acid battery. The main components of the green plate are: Pb ,PbO,PbO 2 ,PbSO 4 ,H 2 O, dilute sulfuric acid and some additives. The traditional method for measuring the content of free lead is to use acetic acid solution to dissolve and remove PbO, and use sodium chloride solution to dissolve and remove PbO. 2 and PbSO 4 , then use nitric acid solution to dissolve the free lead in the residue, use the EDTA titration method to measure the corresponding value, and calculate the lead content in the birth plate. However, traditional methods are ...

Claims

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Application Information

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IPC IPC(8): G01N21/79G01N1/44
Inventor 刘汉敏吴中军唐盺
Owner CHONGQING WANLI NEW ENERGY CO LTD
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