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Method for measuring concentrations of sulfuric acid and manganese sulfate in electrolyte aqueous solution

A manganese sulfate and aqueous solution technology, applied in the field of chemical analysis, can solve the problems of difficult observation of chemical reaction end points, difficult to realize operation automation, large consumption of chemical reagents, etc., to achieve accurate and reliable analysis results, reduce detection costs, and reduce labor effects.

Active Publication Date: 2019-04-23
GUANGXI ERAMET COMILOG CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the production process, using the traditional method to independently analyze the electrolyte in a large number of electrolytic cells has disadvantages such as cumbersome operation, difficult observation of the end point of chemical reaction, slow analysis speed, large consumption of chemical reagents, and difficulty in realizing operation automation.

Method used

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  • Method for measuring concentrations of sulfuric acid and manganese sulfate in electrolyte aqueous solution
  • Method for measuring concentrations of sulfuric acid and manganese sulfate in electrolyte aqueous solution
  • Method for measuring concentrations of sulfuric acid and manganese sulfate in electrolyte aqueous solution

Examples

Experimental program
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Effect test

Embodiment 1

[0051] Embodiment 1: as figure 2 As shown, accurately draw 1ml of the aqueous electrolyte solution sample 1 containing a certain concentration of sulfuric acid and manganese sulfate, place it in a 100mL beaker, add 80ml of distilled water, use 0.5mol / L NaOH as the titrant, and use 0.02ml / 5S as the titrant Add mode for titration, record the conductivity value of each titration point, record the conductivity value of the aqueous solution, and obtain the data series corresponding to the conductivity of the aqueous solution to be measured and the volume of the alkali added, and find out the second by calculating the derivatives of the data series. The coincidence points of the first derivative peak value and the third derivative of 0 are respectively identified as the equivalent points of the reaction of NaOH with sulfuric acid and manganese sulfate, and then the sulfuric acid and manganese sulfate contents of the sample are calculated according to the above calculation method.

Embodiment 2

[0052] Example 2: Accurately draw 1ml of the above-mentioned sample 1, place it in a 100mL beaker, add 80ml of distilled water, use 0.5mol / L NaOH as the titrant, and titrate with the titrant addition mode of 0.10ml / 3S, and record the concentration of the aqueous solution. Conductivity value, to obtain the data series corresponding to the conductivity of the aqueous solution to be measured and the volume of alkali added, by calculating the derivatives of the data series to find out the coincidence points of the peak value of the second derivative and the third derivative of 0, and identify them as NaOH and NaOH respectively. The equivalence point of the sulfuric acid and manganese sulfate reaction, and then calculate the sulfuric acid and manganese sulfate content of the sample according to the above calculation method.

Embodiment 3

[0053] Example 3: Accurately draw 1ml of the above-mentioned sample 1, place it in a 100mL beaker, add 80ml of distilled water, use 0.5mol / L KOH as a titrant, and titrate with a titrant addition mode of 0.02ml / 5S, and record the concentration of the aqueous solution. Conductivity value, to obtain the data series corresponding to the conductivity of the aqueous solution to be measured and the volume of alkali added, by calculating the derivatives of the data series to find out the coincidence points of the peak value of the second derivative and the third derivative of 0, and identify them as NaOH and NaOH respectively. The equivalence point of the sulfuric acid and manganese sulfate reaction, and then calculate the sulfuric acid and manganese sulfate content of the sample according to the above calculation method.

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Abstract

The invention discloses a method for measuring the concentrations of sulfuric acid and manganese sulfate in an electrolyte aqueous solution. The method comprises the steps: (1) an electrolyte aqueoussolution sample is provided; (2) an alkali solution is gradually added, and the conductivity, corresponding to the different addition volumes of the alkali solution, of the aqueous solution sample ismeasured; and (3) the conductivity value is analyzed as a function of the alkali addition amount, the characteristics of the function are associated with (i) the acid and alkali reaction end point and(ii) the manganese sulfate and alkali reaction end point, and the alkali addition volumes corresponding to the two end points correspondingly are obtained; and (4) the alkali addition volumes corresponding to the two end points are converted to the concentrations of the sulfuric acid and the manganese sulfate in the original solution, the alkali addition volumes corresponding to the two end points are converted to the mass M1 of the sulfuric acid and the mass M2 of the manganese sulfate in the original sample, and the concentrations of the sulfuric acid and the manganese sulfate in the original solution are determined according to the volume of the sample. The method is easy to operate, the detection efficiency can be greatly improved, the use amount of chemical reagents is decreased, andthe reliability of detection data is improved.

Description

technical field [0001] The invention relates to the field of chemical analysis and the technical field of electrolytic manganese dioxide production, in particular to a method for measuring the concentration of sulfuric acid and the concentration of manganese sulfate in an aqueous electrolyte solution containing sulfuric acid and manganese sulfate. Background technique [0002] At present, MnSO is generally used in the production process of electrolytic manganese dioxide (hereinafter referred to as EMD). 4 The solution is used as the electrolyte, the anode of the electrolysis is a pole plate made of titanium or titanium alloy, and the cathode is a pole plate made of copper, graphite or similar materials. Mn dissociated under the action of direct current during electrolysis 2+ Generate MnO 2 and deposited on the surface of the anode, while generating H in the electrolytic cell 2 SO 4 and H 2 . Therefore, in the actual production process, the electrolyte contained in the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/06
CPCG01N27/06
Inventor 黄运林陈昌张学英李铁晶
Owner GUANGXI ERAMET COMILOG CHEM