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Method for determining ferric oxide in silica

A ferric oxide and determination method technology, which is applied in the direction of chemical analysis by titration method, can solve the problems of low efficiency, difficult detection and inaccuracy of the detection method, and achieve the advantages of easy and quick grasp, obvious end point and accurate measurement results Effect

Inactive Publication Date: 2017-11-10
BAOTOU IRON & STEEL GRP
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AI Technical Summary

Problems solved by technology

SiO in silica 2 The content is as high as 96%, Fe 2 o 3 The content is low, which also brings difficulties to the detection, and the existing detection methods generally have the problems of low efficiency and inaccuracy

Method used

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  • Method for determining ferric oxide in silica
  • Method for determining ferric oxide in silica
  • Method for determining ferric oxide in silica

Examples

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Embodiment

[0040] 【1. Method Summary】

[0041] Weigh the sample, dissolve it with sulfuric acid-phosphoric acid mixed acid, reduce a large amount of ferric iron with tin dichloride in hydrochloric acid medium, use sodium tungstate as indicator, add titanium trichloride dropwise to reduce the remaining ferric iron to Divalent, excess titanium trichloride is oxidized with potassium dichromate. Titrate with potassium dichromate using sodium diphenylamine sulfonate as indicator.

[0042] 【2. Sample size】

[0043] Weigh 0.5000g of the sample.

[0044] 【3. Analysis steps】

[0045] 3.1 Reagents

[0046] 1 hydrochloric acid (ρ1.19) (hydrochloric acid and water mixed at 1:1)

[0047] 2 sulfuric acid-phosphoric acid mixed acid (mixture of sulfuric acid and phosphoric acid at 5:3)

[0048] 3 sulfuric acid (mixture of sulfuric acid and water at 5:95)

[0049] 4 Titanium trichloride solution

[0050] Take a portion of titanium trichloride solution (15% to 20%), put it into a brown bottle and ...

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Abstract

The invention relates to a method for determining ferric oxide in silica. The method comprises the following steps: a silica sample is weighed and dissolved in sulfuric acid and phosphoric acid mixed acid, most ferric iron is reduced with stannous chloride in hydrochloric acid media, titanium(III) chloride is added dropwise to reduce residual ferric iron into ferrous iron with sodium tungstate as an indicator, and excessive titanium(III) chloride is oxidized with potassium dichromate; a potassium dichromate standard solution is used for titration with sodium diphenylamine sulfonate as an indicator; a blank control group test is performed, and the content of ferric oxide in silica is calculated. The method has the advantages that the operation is rapid and efficient and the result is accurate and stable.

Description

technical field [0001] The invention relates to the field of element detection, in particular to a method for determining ferric oxide in silica. Background technique [0002] Silica is widely found in nature and forms rocks together with other minerals. Naturally occurring silicon dioxide, also called silica, is a hard, refractory solid. [0003] Silica is the main raw material of siliceous refractories. Silica is mainly used in acid refractory bricks in the metallurgical industry. Pure silica can be used as quartz glass or refined single crystal silicon. In the chemical industry, it is used to prepare silicon compounds and silicates, and can also be used as a filling for sulfuric acid towers. In the building materials industry, it is used in glass, ceramics, Portland cement, etc. It can be used as raw material for ferroalloy smelting such as industrial silicon. SiO in silica 2 The content is as high as 96%, Fe 2 o 3 The content is low, which also brings difficulti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N31/16
CPCG01N31/16
Inventor 戴文杰刘建华常欢
Owner BAOTOU IRON & STEEL GRP
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