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Device and method for determining total alkalinity and residual silica content of used sodium silicate-bonded sand or reclaimed sodium silicate-bonded sand

A silicon dioxide and measuring device technology, applied in the preparation of test samples, chemical analysis by titration, etc., can solve problems such as failure to provide the method of silicon dioxide content, and achieve good reproducibility and complete dissolution , the result is accurate

Inactive Publication Date: 2012-08-08
WUHAN TEXTILE UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] 3. Failure to provide a method for testing the silicon dioxide content in the residual binder film of water glass old sand

Method used

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  • Device and method for determining total alkalinity and residual silica content of used sodium silicate-bonded sand or reclaimed sodium silicate-bonded sand
  • Device and method for determining total alkalinity and residual silica content of used sodium silicate-bonded sand or reclaimed sodium silicate-bonded sand
  • Device and method for determining total alkalinity and residual silica content of used sodium silicate-bonded sand or reclaimed sodium silicate-bonded sand

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Weigh the old water glass sand samples three times, and prepare and analyze the liquid samples according to the aforementioned method respectively, and the steaming time is 50 minutes. Obtain about 100 ml of the sample, and then directly titrate the sample, the concentration of hydrochloric acid used is c=0.3960 mol / L, and the indicator is a mixed indicator of methyl red-bromocresol green; the analysis steps are as described above, and the titration analysis results are shown in the following table shown.

[0026]

Embodiment 2

[0028] Weigh 430.2645 grams of the old sand sample of water glass, prepare and analyze the liquid sample according to the aforementioned method, and the steaming time is 60 minutes. Obtain about 522.8 ml of the sample, then use a pipette to pipette 20 ml of the sample for titration, the concentration of hydrochloric acid used is c=0.3960 mol / L, the amount of NaF added is 2 g, and the NaF blank sample V 3 =1 ml), sampled and analyzed three times, the indicator was a mixed indicator of methyl red-bromocresol green.

[0029] 1) Add cresol green-methyl red mixed indicator (three parts of 1g / L bromocresol green ethanol solution, one part of 2g / L methyl red ethanol solution) as titration indicator.

[0030] 2) Titration of Na 2 O: Titrate with 0.5 mol / l hydrochloric acid solution. When the color of the solution changes from green to red, it is the titration end point. The volume of the consumed hydrochloric acid standard solution is recorded as V m1, and this solution continues to ...

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Abstract

The invention relates to a device and a method for determining total alkalinity and residual silica content of used sodium silicate-bonded sand or reclaimed sodium silicate-bonded sand binder membranes. The method comprises the following steps of building an experimental device according to the figure 1, weighing a sample, putting the sample into a sample preparation bottle (4) shown in the figure 1, adding distilled water into a flask by a water replenishing device (2), switching on a power supply, boiling the distilled water, feeding steam into the sample preparation bottle (4) by a connection pipe, wherein the steam passing through the sample is condensed into extract, filtering the extract, wherein the filtered extract flows into a lower collector (5) to form a liquid sample for analysis, cooling the liquid sample to the room temperature, adding an indicator into the liquid sample, carrying out titration by a standard strong acid solution until a titration end point, recording the consumption amount of the standard strong acid solution, calculating total alkalinity of the sample, adding sodium fluoride or potassium fluoride solids into the solution subjected to the total alkalinity determination, shaking up, carrying out dissolution so that the solution has an alkaline color, carrying out titration of produced sodium hydroxide by a strong acid, and calculating the content of silica.

Description

technical field [0001] The invention relates to a method and device for testing sodium oxide content and silicon dioxide content, especially in the technical field of component testing of old sand or regenerated sand of water glass sand, used for measuring the residue of old sand or regenerated sand of water glass sand Total alkalinity (sodium oxide content) and silica content in the adhesive film. Background technique [0002] Residual Na in sodium silicate used sand and recycled sand 2 The amount of O is an important index to describe the quality of water glass-based recycled sand, and it is also an important basis for evaluating water glass sand recycling equipment. Generally, when manufacturers purchase water glass sand treatment equipment, they need to put Na 2 The residual amount of O is written into the technical requirements (generally stipulates that Na in water glass recycled sand 2 The mass fraction of O ≤ 0.6%). When the residual Na 2 When the mass fraction ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N31/16G01N1/28
Inventor 卢记军谭远友闻向东陈长芬彭其安徐自立吴世林卢鑫
Owner WUHAN TEXTILE UNIV
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