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Method for detecting acid reaction activity of calcined kaolin

A technology of calcined kaolin and detection method, which is applied in the detection field of acid reactivity of calcined kaolin, can solve the problem of low acid reactivity, and achieve the effects of accurate detection results, simple operation, and simple equipment and equipment.

Active Publication Date: 2017-04-26
山西晋坤矿产品股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because the level of acid reactivity reflects the degree of calcination of calcined kaolin, if calcined kaolin is under-calcined, or calcined, the acid reactivity of calcined kaolin is low

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Embodiment 1, a kind of detection method of acid reactivity of calcined kaolin, comprises the following steps:

[0027] (1) called m 0 1.000g sample into 120ml Teflon container;

[0028] (2) Use a rubber tube to absorb 10ml of hydrochloric acid with a volume ratio of 1:1 to clean the inner wall of the Teflon container, cover and tighten the lid to ensure that the pressure reducing valve hole on the lid is at the top;

[0029] (3) Rotate the Teflon container to ensure that the sample is saturated with hydrochloric acid;

[0030] (4) Put the Teflon container in the microwave instrument for digestion;

[0031] (5) After the digestion is completed, cool down, and remove the Teflon container after cooling;

[0032] (6) Weigh a crucible that has been sintered for 30 minutes and cooled in a muffle furnace at a preset temperature of 1000°C, and record its mass m 1 is 20.9148g;

[0033] (7) Put the crucible in the sixth step in the filter flask on the crucible stand, turn o...

Embodiment 2

[0041] Embodiment 2, weigh m 0 For 1.000g sample, sintered crucible m 1 is 20.6536g, after sintering, the mass of the sample plus the crucible is m 2 It is 21.2110g, brought into the formula, the calculated LOI is 44.26%, the RW is 0.5574, the acid reactivity H is 44.1, and the calcination is complete.

Embodiment 3

[0042] Embodiment 3, take m 0 For 1.000g sample, sintered crucible m 1 is 22.7318g, after sintering, the mass of the sample plus the crucible is m 2 It is 23.2919g, brought into the formula, the calculated LOI is 43.99%, the RW is 0.5601, the acid reactivity H is 43.8, and the calcination is complete.

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PUM

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Abstract

The invention belongs to the technical field of chemical detection methods, relates to a method for detecting acid reaction activity of calcined kaolin and solves the problem of reflection of calcining completeness degree of kaolin in a calcining process in the prior art. The method includes steps: weighing a sample m0, adding into a Teflon vessel, cleaning the inner wall of the vessel all around with 10ml of hydrochloric acid being 1:1 in volume ratio, covering, tightening, and digesting in a microwave apparatus; cooling after digesting, and moving out the vessel; weighing a crucible subjected to sintering, and recording mass of the crucible as m1; putting the crucible in a filter flask on a crucible holder, starting a vacuum pump, adopting 5% hydrochloric acid for flushing a digested sample, then flushing with deionized water for three times, and standing for one minute to remove excessive moisture; putting the crucible with the flushed sample into a muffle furnace, sintering, moving the crucible to a dryer after sintering is finished, cooling for 20min, weighing the mass and recording as m2; calculating ignition loss and acid reaction activity. The method has advantages of simple equipment, convenience in operation and accuracy in detection result.

Description

technical field [0001] The invention belongs to the technical field of chemical detection methods, in particular to a method for detecting acid reactivity of calcined kaolin. Background technique [0002] Kaolin (Al 2 o 3 2SiO2 2 2H 2 O, referred to as AS2H2), at an appropriate temperature (600 ~ 900 ℃) after dehydration by calcination to form anhydrous aluminum silicate (Al 2 o 3 · 2SiO2 2 , referred to as AS2). It is a highly active mineral admixture, which is an amorphous aluminum silicate formed by calcining kaolin at low temperature, and has high pozzolanic activity. [0003] During the calcination process of kaolin, due to the difference in the chemical environment of Al during the phase transition process, it is activated by calcination at a certain temperature, so that the Al in it has acid reactivity. Since the tetrahedral aluminum formed in the calcination process has acid reactivity, it is easy to carry out extraction reaction with acidic substances. In...

Claims

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Application Information

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IPC IPC(8): G01N5/04
CPCG01N5/04
Inventor 曹永新李亚军李文杰刘继文任向上冯厚孙国权齐世强李江
Owner 山西晋坤矿产品股份有限公司