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Method for measuring natron sodium oxide content in used sand or reclaimed sand of sodium silicate sand

A technology of sodium silicate and regenerated sand, which is applied in the preparation of test samples, analysis by making materials undergo chemical reactions, and material analysis by observing the impact on chemical indicators, etc., can solve the problem of sodium oxide content data duplication Poor reproducibility, long dissolution time, troublesome operation, etc., to avoid uneven heating, uniform heating effect, and good reproducibility

Active Publication Date: 2008-01-30
CRRC QISHUYAN CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0015] This measurement method uses manual stirring or electromagnetic stirring for more than 5 minutes to achieve the promotion of Na 2 The purpose of dissolving O into water, but this operation is cumbersome and takes a long time to dissolve, and it cannot guarantee the complete dissolution of residual sodium oxide. It needs to be dissolved repeatedly to achieve complete dissolution, so the old sand or regenerated sand obtained in the final measurement The content of sodium oxide in the sample is seriously affected by the intensity of the stirring operation; secondly, the content of sodium oxide in the old sand or reclaimed sand sample obtained in the final measurement is also seriously affected by the water temperature, so the old sand or reclaimed sand sample obtained by this method is The reproducibility of the content data of sodium oxide in the reclaimed sand sample is poor, and the error is large

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1 to Embodiment 3

[0031] Weigh 150 grams of solid sodium silicate sand old sand sample, which is the old sand after the casting operation in the steel casting workshop of Qishuyan Locomotive and Rolling Stock Plant of CSR Group Corporation, divide it into three parts I, II and III, and place them separately for use .

Embodiment 1

[0033] Present embodiment is the method for measuring sodium oxide content in the old sand sample of above-mentioned 1 part sodium silicate sand, has the following steps:

[0034] ① Weigh 50.0 grams (i.e. m=50) of solid sodium silicate sand old sand sample (i.e. the first sodium silicate sand old sand sample) and place it in a 300ml Erlenmeyer flask, then add about 100ml deionized water and make The old sand sample of sodium silicate sand is located under the water surface;

[0035] ②Under ambient pressure, place the triangular flask in a microwave heater and heat the mixture in the container with microwaves, and stop the microwave heating after boiling for 30 seconds;

[0036] ③ Cool the mixed material in the container to the ambient temperature, then filter the material in the container to obtain the filter residue and filtrate; wash the filter residue with water 6 times, and add the cleaning liquid after each washing to the liquid filtrate obtained by the filtration treatme...

Embodiment 2

[0040] This embodiment is the method for measuring the sodium oxide content in the above-mentioned II part of sodium silicate sand old sand sample, and this embodiment is basically the same as Example 1, except that: the old sand of sodium silicate sand used in this embodiment The sample is the old sand sample of the second part of sodium silicate sand, and the strong acid solution used is an aqueous nitric acid solution, and its concentration is 0.4980mol / L, and the volume of the aqueous nitric acid solution consumed is 14.57ml; that is, A=0.4980 in the present embodiment, V =14.57, m=50, n=1, put the above data into the formula W(Na 2 (O)=A * V * 62 * n * 100% / (2 * m * 1000) is calculated, thereby draw the mass percent composition of residual sodium oxide in the old water glass sand in the present embodiment to be 0.45%.

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PUM

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Abstract

The invention relates to a measuring method of sodium oxide content in used or recycled sodium silicate bonded sand. The method comprises the processes: (1) solid sand sample is weighed and placed in a container that can be heated; then water is added to the container to keep the sand sample under water surface; (2) the liquid material in the container is heated with microwave to boil under environmental pressure; (3) the liquid material in the container is cooled to environmental temperature and filtered, then a filter residue and a filtrate are obtained; (4) a methyl red indicator is added into the filtrate, then the solution is titrated with standard strong acidic solution; the titration is stopped when the color of the solution turns from red into green; (5) the data recorded is substituted into the formula W(Na2O) is equal to A multiplied by V multiplied by 62 multiplied by n multiplied by 100% / (2 multiplied by m multiplied by 1000) and calculated, thereby the sodium oxide content in used or recycled sodium silicate bonded sand is obtained. The method of the invention has the advantages of quickness, no stirring, entire dissolution of residual sodium oxide and good reproducibility.

Description

technical field [0001] The invention belongs to the technical field of casting molding, and in particular relates to a method for measuring sodium oxide content in old sand or recycled sand of sodium silicate sand. Background technique [0002] In the casting molding process, the molding sand is formed under the action of external force and reaches a certain degree of compactness, which is called sand mold. Molding sand is a kind of microporous-porous system (also called capillary multi-porous system) with certain strength composed of raw sand and binder, and of course it also includes some addenda when necessary. The raw sand is the backbone material, accounting for 82% to 99% of the total mass of the molding sand; the binder plays the role of bonding the sand particles, covering the sand particles in the form of a bonding film, so that the molding sand has the necessary strength and toughness; the addition is to improve The properties required by the molding sand, or subs...

Claims

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Application Information

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IPC IPC(8): G01N21/79G01N1/28G06F19/00
Inventor 朱向阳
Owner CRRC QISHUYAN CO LTD