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Method for detecting concentration of four acids in mixed acid liquor

A technology of mixing acid and acid concentration, which is applied in the field of detection and analysis, can solve the problems of complicated methods and inability to detect the components of acid liquid mixed with four kinds of acids, and achieves a simple operation method, which is conducive to product quality control and fast detection speed. Effect

Inactive Publication Date: 2021-12-17
应悦
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0015] The present invention proposes a method for detecting the concentrations of four acids in a mixed acid solution, which solves the problem in the prior art that the components of an acid solution mixed with four acids cannot be detected
Also solved simultaneously, the problem that the method in the existing provided technology is too complicated

Method used

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  • Method for detecting concentration of four acids in mixed acid liquor
  • Method for detecting concentration of four acids in mixed acid liquor
  • Method for detecting concentration of four acids in mixed acid liquor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0080] To prepare mixed acid:

[0081] Four acids (sulfuric acid, hydrofluoric acid, hydrochloric acid, fluosilicic acid)

[0082] Preparation of standard solution: Accurately weigh 4.9201g of 98.32% sulfuric acid, 4.8624g of 40.69% hydrofluoric acid, 12.5335g of 32.02% hydrochloric acid, 16.5495g of 36.0% fluosilicic acid, and 1.1826g of water to prepare about 12% sulfuric acid and 5% hydrogen 40g of standard acid solutions of hydrofluoric acid, 10% hydrochloric acid, and 15% fluosilicic acid.

[0083] Standard solution preparation h 2 SO 4

[0084] The sampling in the following examples is all taken from Example 1.

Embodiment 2

[0086] (1) Determination of total acidity and fluosilicic acid content

[0087] Take a sample of 1.0702g of the test solution into the titration bottle 1, and add 50ml of frozen KNO to the titration bottle 3 solution, add 0.1ml phenolphthalein indicator solution and keep the solution ice-cold (about 0°C). Use a 50mL automatic burette (with 0.4985mol / L standard NaOH titration solution inside) to titrate until the light pink color in the solution remains unchanged for 15 seconds, and consume 20.43ml of NaOH standard solution. The phenolphthalein indicator solution used at this time can be replaced by a mixed indicator of "bromothymol blue sodium salt + phenol red sodium salt". At this time, the titration end point is "deep purple without fading for 15 seconds".

[0088] Add 100mL of boiling water (referring to 99°C) to titration bottle 1, and immediately titrate with sodium hydroxide standard solution until the light pink color that appears remains unchanged for 15 seconds, and...

Embodiment 3

[0124] (1) Determination of total acidity and fluosilicic acid content

[0125] Take a sample of 1.0760g of the test solution into the titration bottle 1, and add 50ml of frozen KNO to the titration bottle 3 solution, add 0.1ml phenolphthalein indicator solution and keep the solution ice-cold (about 0°C). Use a 50mL automatic burette (with 0.4985mol / L standard NaOH titration solution inside) to titrate until the light pink color in the solution remains unchanged for 15 seconds as the end point, and consume 20.55ml of NaOH standard solution.

[0126] Add 100mL of boiling water to titration bottle 1, and immediately titrate with sodium hydroxide standard solution until the light pink color appears and remains unchanged for 15 seconds, and consumes 9.74ml of NaOH standard solution.

[0127] Use the following calculation formula to calculate the total acidity and fluosilicic acid content:

[0128]

[0129]

[0130] (2) Determination of hydrochloric acid content

[0131] T...

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Abstract

The invention provides a method for detecting the concentration of four acids in mixed acid liquor. The method comprises the following steps of measuring the total acidity and the content of fluosilicic acid, measuring the content of hydrochloric acid: adding barium nitrate, precipitating fluosilicate and sulfate radicals in the solution, and titrating chloride ions by using silver nitrate to measure the content of hydrochloric acid, determining the content of hydrofluoric acid: adding active silicon dioxide, enabling the active silicon dioxide to react with the hydrofluoric acid in the solution to produce fluosilicic acid, then determining the content of the fluosilicic acid, and subtracting the content of the fluosilicic acid, which is determined for the first time, from the content of the fluosilicic acid to calculate the content of HF, and determining the content of sulfuric acid in the solution by subtracting the content of hydrofluoric acid, hydrochloric acid and fluosilicic acid from the total acid. The method disclosed by the invention can be used for detecting the acid liquor component formed by mixing four acids, is simple and safe to operate, and is suitable for industrial popularization and application.

Description

technical field [0001] The invention relates to the technical field of detection and analysis, in particular to a method for detecting the concentration of four acids in a mixed acid solution. Background technique [0002] In the production enterprises of hydrofluoric acid, fluorosilicic acid, hydrochloric acid, sulfuric acid or enterprises that produce these acids by-products, sampling inspections must be carried out on the production process to ensure the normal production; and quality inspections of products are also required. Ensure product quality meets specified requirements. [0003] In enterprises that use hydrofluoric acid, fluosilicic acid, hydrochloric acid, and sulfuric acid as raw materials, sampling and analysis of raw materials are also required to ensure quality; conduct. [0004] For example, a display production factory uses hydrofluoric acid and hydrochloric acid (or sulfuric acid) as raw materials to thin the panel glass. When preparing the thinning aci...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N31/16
CPCG01N31/16
Inventor 应悦应盛荣王鸿莺
Owner 应悦
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