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A method for dividing reaction kinetics stages in fly ash strong alkali system

A technology of reaction kinetics and fly ash, applied in chemical method analysis, scientific instruments, analytical materials, etc., can solve problems that hinder basic theory and practical application research, affect the deepening and expansion of fly ash application fields, and achieve easy The effect of the operation

Active Publication Date: 2020-03-06
JIANGSU PROVINCIAL ACAD OF ENVIRONMENTAL SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, as far as the research results at home and abroad are concerned, there is still no method for accurately dividing the reaction kinetics stages of the fly ash strong alkali reaction system, which hinders the research of basic theory and practical application in related fields, and further affects It has further deepened and expanded the application field of fly ash

Method used

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  • A method for dividing reaction kinetics stages in fly ash strong alkali system
  • A method for dividing reaction kinetics stages in fly ash strong alkali system
  • A method for dividing reaction kinetics stages in fly ash strong alkali system

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Effect test

Embodiment 1

[0030] 1) Strong base system reaction

[0031] The fly ash sample was reacted with a strong alkali solution (5mol / L NaOH solution) according to the solid-to-liquid ratio (mass ratio: 1 / 10), the reaction temperature was 35°C, and the reaction time was 0-48h.

[0032] 2) Calculate the original silicon parameter M 0

[0033] Calculate the apparent substance concentration of silicon in the reaction system by formula (1), and record it as the original silicon parameter M 0 , its value is 2.3mol / L.

[0034]

[0035] where m 0 (g) is the quality of fly ash in the reaction system, C 0 (%) is the mass fraction of silicon in fly ash, V 0 (L) is the volume of the mixed system.

[0036] 3) Silicon parameter series 1

[0037] After the strong alkali system reaction is completed, filter the mixed solution through a 0.45 μm filter membrane to detect the silicon element concentration in the solution, and obtain the silicon parameter series 1, which is recorded as [N 1j ].

[0038]...

Embodiment 2

[0055] Method is the same as embodiment 1, wherein,

[0056] 1) Strong base system reaction

[0057] The fly ash sample was reacted with a strong alkali solution (7.5mol / L NaOH solution) according to the solid-to-liquid ratio (mass ratio: 1 / 20), the reaction temperature was 25°C, and the reaction time was 0-48h.

[0058] 2) Calculate the original silicon parameter M 0

[0059] Calculate the apparent substance concentration of silicon in the reaction system by formula (1), and record it as the original silicon parameter M 0 , and its value is 1.15mol / L.

[0060] 3) Silicon parameter series 1

[0061] After the strong alkali system reaction is completed, filter the mixed solution through a 0.45 μm filter membrane to detect the silicon element concentration in the solution, and obtain the silicon parameter series 1, which is recorded as [N 1j ].

[0062] 4) Silicon parameter series 2

[0063] Use a dilute mixed acid solution (30% HF, 30% HCl and 40% citric acid) to react wit...

Embodiment 3

[0076] Method is the same as embodiment 1, wherein,

[0077] 1) Strong base system reaction

[0078] The fly ash sample was reacted with a strong alkali solution (10mol / L NaOH solution) according to the solid-to-liquid ratio (mass ratio: 140), the reaction temperature was 50°C, and the reaction time was 0-48h.

[0079] 2) Calculate the original silicon parameter M 0

[0080] Calculate the apparent substance concentration of silicon in the reaction system by formula (1), and record it as the original silicon parameter M 0 , and its value is 0.575mol / L.

[0081] 3) Silicon parameter series 1

[0082] After the strong alkali system reaction is completed, filter the mixed solution through a 0.45 μm filter membrane to detect the silicon element concentration in the solution, and obtain the silicon parameter series 1, which is recorded as [N 1j ].

[0083] 4) Silicon parameter series 2

[0084] Use dilute mixed acid solution (30% HF, 30% HCl and 40% citric acid) to react with...

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Abstract

The invention discloses a method for dividing reaction kinetics stages under a fly ash strong alkaline system. The method comprises the following steps: reacting a fly ash sample with a strong alkaline solution according to a determined solid-liquid ratio; calculating the dose concentration M0 of an apparent matter of a silicon element in a reaction system; after the reaction of the strong alkaline system is finished, detecting the concentration of the silicon element in the solution to obtain a silicon parameter series 1; using a dilute mixed acid solution to react with filter residues; after the reaction is finished, detecting the concentration of the silicon element in the mixed acid solution to obtain a silicon parameter series 2; calculating to obtain a characteristic parameter series 1 and a characteristic parameter system 2; carrying out comparative analysis on the characteristic parameter series 1 and the characteristic parameter system 2 to obtain a characteristic reaction boundary 2 and a characteristic reaction boundary 1; and analyzing the characteristic reaction boundary 2 and the characteristic reaction boundary 1 to obtain all the kinetics reaction stages under the fly ash strong alkaline system. The method disclosed by the invention is accurate and easy to operate, and provides a theoretical basis for comprehensive utilization of fly ash.

Description

technical field [0001] The invention relates to the technical field of reaction kinetic stages, in particular to a method for dividing reaction kinetic stages in a fly ash strong alkali system. Background technique [0002] Fly ash is a solid waste produced by coal combustion in power plants. Because fly ash is rich in silicon, it is often used as an inorganic silicon resource. Generally speaking, the reaction with strong alkali in a hydrothermal environment is one of the important methods to utilize silicon in fly ash. At present, fly ash synthesizes zeolite, fly ash-based geopolymers and some new environmental materials are based on The reaction process of fly ash in strong alkali system. Therefore, to understand the kinetic reaction stage of fly ash under strong alkali system is of great theoretical and practical importance for understanding the reaction mechanism of fly ash under strong alkali system and promoting the application of fly ash in the field of new materials...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N31/00
CPCG01N31/00
Inventor 程婷王小平韩承辉谢伟芳
Owner JIANGSU PROVINCIAL ACAD OF ENVIRONMENTAL SCI
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