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Method for identifying volcanic ash activity of coal ash

A technology of pozzolanic activity and fly ash, which is applied in the field of identification of fly ash pozzolanic activity, can solve the problems that affect the deepening and expansion of the application field of fly ash, hinder the basic theoretical research of the reaction mechanism of fly ash, and achieve easy operation, The effect of simple method

Inactive Publication Date: 2011-03-02
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, as far as the current research results at home and abroad are concerned, there is still no method for accurately and quantitatively evaluating the activity of fly ash pozzolana, which greatly hinders the basic theoretical research on the reaction mechanism of fly ash, and further affects the Further deepening and expansion of coal ash application field

Method used

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  • Method for identifying volcanic ash activity of coal ash
  • Method for identifying volcanic ash activity of coal ash
  • Method for identifying volcanic ash activity of coal ash

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] 1) Alkali soluble

[0023] Use 7.5M KOH solution to mix and react with the fly ash sample to be tested, control the reaction temperature at 50°C, and then take samples at 6 hours, 9 hours, 24 hours, 72 hours and 120 hours.

[0024] 2) pickling

[0025] Each sample after alkali dissolution in step 1 was filtered, and the filter residue was pickled with 3% hydrochloric acid solution at normal temperature, and then filtered, and the filter residue was dried and weighed.

[0026] 3) calculate

[0027] Each sample after pickling, drying and weighing in step 2 is calculated by the above formula to obtain the reaction degree of the samples obtained at 6 hours, 9 hours, 24 hours, 72 hours and 120 hours respectively as 6.28%, 8.03 %, 15.56%, 39.12% and 55.23%.

[0028] 4) Assessment of pozzolanic activity

[0029] Utilize the linear equation through the origin to plot the reaction degree of each fly ash gained in step 3 to time, see figure 1 , the obtained straight line is ...

Embodiment 2

[0031] 1) Alkali soluble

[0032] Use 7.5M KOH solution and the fly ash sample to be tested for a mixed reaction at a solid-to-liquid ratio of 1:40, control the reaction temperature at 75°C, and then take samples at 1 hour, 3 hours, 6 hours, 9 hours and 24 hours .

[0033] 2) pickling

[0034] Each sample after alkali dissolution in step 1 was filtered, and the filter residue was pickled with 3% hydrochloric acid solution at normal temperature, and then filtered, and the filter residue was dried and weighed.

[0035] 3) calculate

[0036] Each sample after pickling, drying and weighing in step 2 is calculated by the above formula to obtain the reaction degree of the samples taken at 1 hour, 3 hours, 6 hours, 9 hours and 24 hours respectively as 5.37%, 10.13 %, 15.12%, 23.87% and 47.06%.

[0037] 4) Assessment of pozzolanic activity

[0038] Utilize the linear equation through the origin to plot the reaction degree of each fly ash gained in step 3 to time, see figure 2 ,...

Embodiment 3

[0040] 1) Alkali soluble

[0041] Use 7.5M KOH solution and the fly ash sample to be tested for a mixed reaction at a solid-to-liquid ratio of 1:40, control the reaction temperature at 40°C, and then take samples at 6 hours, 24 hours, 72 hours, 120 hours and 168 hours .

[0042] 2) pickling

[0043] Each sample after alkali dissolution in step 1 was filtered, and the filter residue was pickled with 6% hydrochloric acid solution at room temperature, then filtered, and the filter residue was dried and weighed.

[0044] 3) calculate

[0045] Each sample after pickling, drying and weighing in step 2 is calculated by the above formula to obtain the reaction degree of the samples obtained at 6 hours, 24 hours, 72 hours, 120 hours and 168 hours respectively as 4.61%, 8.03 %, 18.77%, 26.67%, and 35.34%.

[0046] 4) Assessment of pozzolanic activity

[0047] Utilize the linear equation through the origin to plot the reaction degree of each fly ash obtained in step 3 to time, see ...

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Abstract

The invention discloses a method for identifying volcanic ash activity of coal ash, comprising the following steps: firstly, using an alkali solution and an acid-washing technology to assess the volcanic ash activity of the coal ash; then, controlling certain aqueous alkali concentration, reaction temperature and reaction time; finally, carrying out acid-washing on filtered filter residues and drawing a graph indicating the relationship between reaction degree of samples at various time slots and time to obtain slope of straight lines passing the original point, which is exactly the volcanic ash activity of the coal ash at the sodu concentration and temperature. The method in the invention is simple, easy to operate, widely applied to identifying activity of coal ash in thermal power plants and provides theoretical basis for comprehensive utilization of the coal ash.

Description

technical field [0001] The invention relates to a material activity identification method, in particular to a method for identifying fly ash pozzolanic activity. Background technique: [0002] Fly ash comes from the inorganic components in coal. It is a silicon-aluminum material with artificial pozzolanic activity formed after a series of physical and chemical changes of coal powder under the high-temperature thermodynamic action in the boiler. At present, it has been widely used in various fields such as cement industry, civil engineering, roadbed construction and new geopolymer materials. The potential pozzolanic activity of fly ash is the basis for its application in these fields. However, as far as the current research results at home and abroad are concerned, there is still no method for accurately and quantitatively evaluating the activity of fly ash pozzolana, which greatly hinders the basic theoretical research on the reaction mechanism of fly ash, and further affec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N5/04
Inventor 李琴沈立锋陈晨李培明翟建平
Owner NANJING UNIV