Method for measuring content of calcium sulfate in desulfurized gypsum of coal-fired power plant

A technology for desulfurized gypsum and coal-fired power plants, which is applied in the direction of material analysis by observing the influence of chemical indicators, and analysis by chemical reaction of materials, etc., can solve problems such as titration errors, and achieve simple operation steps and testing process. Efficient and fast, drug consumption and low cost effect

Pending Publication Date: 2021-10-08
INNER MONGOLIA POWER GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it is necessary to be equipped with a temperature titrator, accurately grasp the use of the temperature titration system, and manually judge the titration position of the curve, which is prone to titration errors

Method used

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  • Method for measuring content of calcium sulfate in desulfurized gypsum of coal-fired power plant
  • Method for measuring content of calcium sulfate in desulfurized gypsum of coal-fired power plant
  • Method for measuring content of calcium sulfate in desulfurized gypsum of coal-fired power plant

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reference example 1

[0047] The preparation method of the hydrogen type cation exchange resin is as follows: add a sodium chloride solution with a mass concentration of 8% to the 004×7 type strong acid cation exchange resin, soak for 30 hours, wash with desalted water until the washing water is colorless, filter, and then add Sodium hydroxide solution with a mass concentration of 3%, soak for 2 hours, wash with desalted water until the washing water is neutral, filter, and finally add hydrochloric acid solution with a mass concentration of 6%, soak for 2 hours, wash with desalted water until the washing water is neutral, The hydrogen form cation exchange resin 1 was obtained, and the measured pH value was 2.7.

reference example 2

[0049] The preparation method of the hydrogen-type cation exchange resin is as follows: add a sodium chloride solution with a mass concentration of 10% to the 001×7 type strong acid cation-exchange resin, soak for 24 hours, wash with desalted water until the washing water is colorless, filter, and then add Sodium hydroxide solution with a mass concentration of 2%, soak for 3 hours, wash with desalted water until the washing water is neutral, filter, and finally add hydrochloric acid solution with a mass concentration of 5%, soak for 3 hours, wash with desalted water until the washing water is neutral, The hydrogen form cation exchange resin 2 was obtained, and the measured pH value was 2.8.

reference example 3

[0051] The preparation method of the hydrogen type cation exchange resin is as follows: add a sodium chloride solution with a mass concentration of 12% to the 002SC type strongly acidic cation exchange resin, soak for 20 hours, wash with desalted water until the cleaning water is colorless, filter, and then add a mass concentration of 1% sodium hydroxide solution, soak for 4 hours, wash with desalinated water until the washing water is neutral, filter, and finally add hydrochloric acid solution with a mass concentration of 4%, soak for 4 hours, wash with desalinated water until the washing water is neutral, and obtain hydrogen Type cation exchange resin 3, the measured pH value is 2.9.

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Abstract

The invention relates to a method for measuring the content of calcium sulfate in desulfurized gypsum of a coal-fired power plant, which comprises the following steps: (1) drying the desulfurized gypsum in the sun, grinding, sieving and drying, adding hydrogen peroxide, demineralized water and cation exchange resin, stirring to adjust the pH value, stirring, filtering with filter paper, and fixing the volume to obtain a desulfurized gypsum oxidation solution; (2) transferring the desulfurized gypsum oxidation solution, adding absolute ethyl alcohol and an alizarin red S indicator, uniformly mixing, titrating with a barium chloride standard solution, slowly generating turbid substances in a yellow solution, shaking while titrating, determining the titration end point when reddish color appears, and recording the volume of the consumed standard solution; and (3) substituting the volume of the consumed standard solution into a calculation formula, and calculating to obtain the content of calcium sulfate. The method has the advantages of simple operation steps, good repeatability of detection results, high accuracy, high efficiency, rapidness, low pollution, low drug consumption and low cost, meets the requirements of thermal power plant detection laboratories, and has a wide application range.

Description

technical field [0001] The invention relates to a method for determining the content of calcium sulfate, in particular to a method for determining the content of calcium sulfate in desulfurized gypsum in coal-fired power plants. Background technique [0002] The main flue gas desulfurization technology of coal-fired units in thermal power plants in my country is wet flue gas desulfurization (WFGD), and its by-products are mainly sulfate (CaSO 4 2H 2 o). Data show that by 2020, the national output of desulfurized gypsum will reach 1×10 9 t / a, will become one of the main solid wastes of coal-fired power plants. Desulfurization gypsum can be used comprehensively as a resource. In order to improve the utilization efficiency of desulfurization gypsum, its excellent quality must be guaranteed. In the flue gas desulfurization system, the sulfate content not only affects the quality of gypsum, but also affects the operation of the gypsum dehydration system. It is necessary to ti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/78G01N21/82
CPCG01N21/78G01N21/82
Inventor 陈媛媛张志勇赵全中吴宇刘显丽郝素华张晗李霞武洁阿茹娜
Owner INNER MONGOLIA POWER GRP
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