Active aluminum detection method

A measurement method, the technology of active aluminum, which is applied in the direction of analyzing the material by chemical reaction and analyzing the material by observing the influence on the chemical indicator, which can solve the problems of strict operation requirements, harsh conditions and high cost, and achieve the test The effect of high precision and simple operation

Inactive Publication Date: 2013-02-20
成都桑莱特科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this method is a national standard, the principle itself is reliable and classic, but because this method requires a special gas measuring instrument, the cost is high, and the operation requirements are strict, the conditions are relatively harsh, and a little carelessness will easily cause large errors

Method used

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  • Active aluminum detection method

Examples

Experimental program
Comparison scheme
Effect test

specific Embodiment

[0044] Let me introduce the instruments needed in this embodiment as follows:

[0045] Separating funnel: 250 ml, 2 pieces

[0046] Burette: 50 ml, 1 piece

[0047] Erlenmeyer flask with ground mouth: 500 ml, 2 pcs

[0048]The above description is not intended to limit the instrument used in the present invention to the above content and cannot be replaced. In fact, in the present invention, any instrument that can achieve the functions of the above instrument can be used as the instrument of the present invention.

[0049] The reagent used in the invention is as follows:

[0050] 1% (mass volume ratio: 1 gram of sodium diphenylamine sulfonate dissolved in 100 ml of water) sodium diphenylamine sulfonate indicator.

[0051] Sulphur-phosphorus mixed acid: 98% sulfuric acid and 85% phosphoric acid are mixed at a volume ratio of 1:4.

[0052] 15% NaHCO3 saturated solution: 15 grams of NaHCO3 dissolved in 100ml of water.

[0053] 10% sulfuric acid aqueous solution: Measure 10m...

example 1

[0057] In the following implementation, the sample is 0.15 grams as the criterion, to introduce the specific implementation process of the method, a method for the determination of active aluminum, comprising the steps:

[0058] Step 1, prepare Fe 2 (SO 4 ) 3 Reagent; Concrete process is as follows: take by weighing 330 grams of Fe 2 (SO 4 ) 3 In 750 ml of water, add 75 ml of 98% concentrated sulfuric acid, heat to dissolve, dilute into 1000ml volumetric flask after cooling.

[0059] Step 2, weighing and dissolving the sample: the specific process is as follows: Accurately weigh a certain amount (such as but not limited to 0.15 g) of aluminum powder sample into a 500 ml ground-mouth conical flask, and slowly add 25 to 35 m1 (preferably 30 m1) Fe 2 (SO 4 ) 3 solution; Immediately plug the bottle with a rubber stopper equipped with a separatory funnel and an outlet hose, and insert one end of the outlet tube into a solution filled with saturated NaHCO 3 solution in the...

Embodiment 2

[0069] The only difference between Example 2 and Example 1 is that in step 3, before adding the sodium diphenylamine sulfonate indicator, 15 ml of sulfur-phosphoric acid and about 30 ml of water are added. There are two effects of adding sulfur-phosphorus mixed acid: one is to control the acidity required for titration; the other is to make the color change of the indicator more sensitive; it can make the determination more accurate.

[0070] Table 1 is a set of data of the parallel test of the method involved in the patent of the present invention and the national standard active aluminum detection method (GB3169.1-1982). The results show that the measurement results of the method of the present invention are within the tolerance range (parallel ≤ 0.8%), Fully able to meet the requirements, and convenient and easy.

[0071]

[0072] Table 1

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Abstract

The invention discloses an active aluminum detection method. The method comprises the following steps of: preparing a Fe2(SO4)3 solution; weighing and dissolving the sample in the following specific processes of accurately weighing an aluminum powder sample in a container, and slowly adding the Fe2(SO4)3 solution prepared in the first step and 10% of a sulfuric acid solution into the container; instantly sealing an opening of the container and only leaving an outlet which is communicated with a NaHCO3 solution; quickly adding the NaHCO3 solution into the container, slightly swinging the container, and subsequently putting the container on a heat source to heat and boil till the reaction is complete; titrating the solution and calculating in the following specific processes of taking the container (namely a triangular flask) down, cooling the container to a room temperature, then dropwise adding a sodium diphenylamine sulfonate indicator into the container, and instantly titrating the solution by a K2Cr2O7 solution till the solution changes from green to purple or hyacinthine as a result; and then calculating the content of active aluminum by a formula. The active aluminum detection method has the beneficial effects of no need for purchasing special equipment, simple operation and high detection precision.

Description

technical field [0001] The invention relates to the determination of active aluminum, in particular to a method for determining the content of active aluminum by means of a redox method. [0002] Background technique [0003] Aluminum powder is a key raw material of exothermic solder, which directly participates in the chemical reaction of exothermic welding, which affects the intensity of the reaction and the quality of the resulting joint. Therefore, the quality control of aluminum powder is very important, but in the storage process of aluminum powder It is inevitable to be in contact with air, so a layer of Al is formed on the surface of aluminum powder. 2 o 3 oxide film. In the case of utilizing the performance of metallic aluminum, this part is inactive aluminum. The analysis method of active aluminum in the existing aluminum powder is the national standard - gas volumetric method for the determination of active aluminum. Calculate the content of active aluminum b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/78
Inventor 代作海
Owner 成都桑莱特科技股份有限公司
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