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Method for measuring content of calcium carbonate in gypsum

A technology of calcium carbonate and content, which is applied in the direction of material analysis by observing the influence of chemical indicators, and analysis by making materials undergo chemical reactions, can solve the problems of rapid analysis and tedious measurement time required by unfavorable tests, and achieve Reasonable method design, accurate and stable results

Inactive Publication Date: 2014-12-10
BLUESTAR LEHIGH ENG INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The prior art method is cumbersome and takes a long time to measure, which is not conducive to the rapid analysis of test requirements

Method used

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  • Method for measuring content of calcium carbonate in gypsum
  • Method for measuring content of calcium carbonate in gypsum
  • Method for measuring content of calcium carbonate in gypsum

Examples

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Comparison scheme
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Embodiment 1

[0022] Embodiment 1, a kind of method for measuring calcium carbonate content in gypsum, its main steps are as follows:

[0023] (1) Weigh a certain amount of sample into a container; add an appropriate amount of sodium chloride solution with a mass concentration of 5%, place it on an electric heating plate and heat to a slight boil;

[0024] (2) Remove the filter, wash it with a 0.8% NaCl solution at 50°C, and put the filter paper into a container;

[0025] (3) Add hydrochloric acid solution, put it on an electric heating plate and heat to slightly boil; in the hydrochloric acid solution, the volume ratio of hydrochloric acid to water is 1:4;

[0026] (4) Remove the filter, adjust the pH value of the filtrate to alkaline; add a masking agent, titrate the calcium ion with a standard solution to obtain the content of calcium carbonate; the masking agent is a triethanolamine solution, and in the triethanolamine solution: triethanol The volume ratio with water is 1:2.5; the stan...

Embodiment 2

[0027] Embodiment 2, a kind of method for measuring calcium carbonate content in gypsum, its main steps are as follows:

[0028] (1) Weigh a certain amount of sample into a container; add an appropriate amount of sodium chloride solution with a mass concentration of 5-20%, and heat it on a heating plate until slightly boiling;

[0029] (2) Remove the filter, wash it with a 1.2% NaCl solution at 70°C, and put the filter paper into a container;

[0030] (3) Add hydrochloric acid solution, put it on an electric heating plate and heat to slightly boil; in the hydrochloric acid solution, the volume ratio of hydrochloric acid to water is 1:6;

[0031] (4) Remove the filter, adjust the pH value of the filtrate to alkaline; add a masking agent, titrate the calcium ion with a standard solution to obtain the content of calcium carbonate; the masking agent is a triethanolamine solution, and in the triethanolamine solution: triethanol With the volume ratio of water is 1: 5; Described sta...

Embodiment 3

[0032] Embodiment 3, a kind of method for measuring calcium carbonate content in gypsum, its main steps are as follows:

[0033] (1) Weigh a certain amount of sample into a container; add an appropriate amount of sodium chloride solution with a mass concentration of 10%, and heat it on a heating plate until slightly boiling;

[0034] (2) Remove the filter, wash it with a 1% NaCl solution at 60°C, and put the filter paper into a container;

[0035] (3) Add hydrochloric acid solution, put it on an electric heating plate and heat to slightly boil; in the hydrochloric acid solution, the volume ratio of hydrochloric acid to water is 1:5;

[0036] (4) Remove the filter, adjust the pH value of the filtrate to alkaline; add a masking agent, titrate the calcium ion with a standard solution to obtain the content of calcium carbonate; the masking agent is a triethanolamine solution, and in the triethanolamine solution: triethanol The volume ratio with water is 1:3; the standard solution...

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Abstract

The invention discloses a method for measuring the content of calcium carbonate in gypsum. The method comprises the following steps: weighing a certain amount of samples into a utensil; adding a sodium chloride solution and heating on an electrical heating plate until the solution is slightly boiled; taking down, filtering, washing with the NaCl solution, and putting filter paper into the utensil; adding a hydrochloric acid solution and heating on the electrical heating plate until the solution is slightly boiled; taking down, filtering, and adjusting the pH value of filter liquor to be more than 7; adding a masking agent, and titrating calcium ions in calcium carbonate by a standard solution to obtain the content of calcium carbonate. The method is reasonable in design, quick, convenient, accurate and stable in result and wide in application range.

Description

technical field [0001] The invention relates to a content determination method, in particular to a method for determining calcium carbonate content in gypsum. Background technique [0002] In the research process of the reaction process of using heavy calcium carbonate and sulfuric acid (waste) to generate gypsum, because the ratio of reactants and reaction time and other parameters need to be controlled, it is necessary to test the product, that is, to detect the amount of calcium carbonate in gypsum To determine the proportion and time of the reactants and other parameters. And the content determination method of calcium carbonate in the prior art is to measure the content of total calcium oxide and the content of sulfate radical in the sample earlier, then calculate the content of calcium in calcium sulfate according to the content of sulfate radical, finally subtract with total calcium Remove the calcium from the calcium sulfate to obtain the amount of calcium carbonate...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/79
Inventor 单连勇郭凤云张素芳
Owner BLUESTAR LEHIGH ENG INST CO LTD
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