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Method for measuring iron content in direct reduction iron of steelmaking auxiliary material

A determination method and technology for reducing iron, applied in the direction of chemical analysis by titration, can solve the problems of large measurement error, difficult determination of metallic iron content, incomplete sample dissolution, etc., to avoid oxidation loss, improve accuracy and The effect of precision

Active Publication Date: 2014-03-05
武汉钢铁有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the content of metallic iron in direct reduced iron is not easy to determine, there is no quantitative analysis and determination method at present, the sample is not completely dissolved by the conventional sample dissolution method, and the measurement error of the conventional titration method is relatively large. Therefore, it is still There is no effective method to measure the total iron content in direct reduced iron; and in the measurement process, in order to avoid the oxidation of metallic iron to cause low measurement results, it is necessary to isolate the air as much as possible. Therefore, in order to meet the on-site test In order to meet the requirements of fast and accurate sample analysis, it is necessary to invent a fast, accurate and air-isolated method for determining the content of metallic iron in direct reduced iron.

Method used

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  • Method for measuring iron content in direct reduction iron of steelmaking auxiliary material

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Embodiment 1

[0025] A method for measuring total iron content in steelmaking auxiliary material direct reduced iron, comprising the following steps:

[0026] 1) Sample particle size, blank test and measurement times

[0027] 1.1) Sample particle size: The sample particle size should be less than 0.125mm (less than 120 mesh).

[0028] 1.2) Blank test: do a blank test together with the sample, and the reagents used must be taken from the same reagent bottle.

[0029] 1.3) Measurement times: the same sample, in the same laboratory, should be measured twice by the same operator.

[0030] 1.4) Calibration test: analyze the standard sample with similar content of the same type along with the sample.

[0031] 2) Devices and reagents

[0032] 2.1) Erlenmeyer flask with stopper (200mL)

[0033] 2.2) S21-2 electromagnetic stirrer

[0034] 2.3) M-50 sand core filter movable device

[0035] 2.4) Qualitative filter paper

[0036] 2.5) Suction filter bottle (200mL)

[0037] 2.6) Burette with plu...

Embodiment 2

[0061] The method for measuring the total iron content in steelmaking auxiliary material direct reduced iron comprises the following steps:

[0062] 1) Sample particle size, blank test and measurement times

[0063] 1.1) Sample particle size: The sample particle size should be less than 0.125mm (less than 120 mesh).

[0064] 1.2) Blank test: do a blank test together with the sample, and the reagents used must be taken from the same reagent bottle.

[0065] 1.3) Measurement times: the same sample, in the same laboratory, should be measured twice by the same operator.

[0066] 1.4) Calibration test: analyze the standard sample with similar content of the same type along with the sample.

[0067] 2) Devices and reagents

[0068] 2.1) Erlenmeyer flask with stopper (100mL)

[0069] 2.2) S21-2 Electromagnetic Stirrer

[0070] 2.3) M-50 sand core filter movable device

[0071] 2.4) Qualitative filter paper

[0072] 2.5) Suction filter bottle (500mL)

[0073] 2.6) Burette with...

Embodiment 3

[0096] The method for measuring the total iron content in steelmaking auxiliary material direct reduced iron comprises the following steps:

[0097] 1) Sample particle size, blank test and measurement times

[0098] 1.1) Sample particle size: The sample particle size should be less than 0.125mm (less than 120 mesh).

[0099] 1.2) Blank test: do a blank test together with the sample, and the reagents used must be taken from the same reagent bottle.

[0100] 1.3) Measurement times: the same sample, in the same laboratory, should be measured twice by the same operator.

[0101] 1.4) Calibration test: analyze the standard sample with similar content of the same type along with the sample.

[0102] 2) Devices and reagents

[0103] 2.1) Erlenmeyer flask with stopper (100mL)

[0104] 2.2) S21-2 Electromagnetic Stirrer

[0105] 2.3) M-50 sand core filter movable device

[0106] 2.4) Qualitative filter paper

[0107] 2.5) Suction filter bottle (500mL)

[0108] 2.6) Burette with...

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Abstract

The invention discloses a method for measuring the iron content in direct reduction iron of a steelmaking auxiliary material. The method comprises the following steps: 1, decomposing a test sample, namely, weighing a reduced iron test sample, adding an FeCl3 solution, placing on a magnetic stirrer, and stirring for 20-30min; 2, filtering the test sample, namely, filtering and sealing the stirred test sample; and 3, titrating the test sample, namely, adding sulfuric-phosphoric mixed acid in the test sample, sealing a suction filtration bottle opening by using a rubber plug, placing on the magnetic stirrer, stirring for 20-30min, opening the rubber plug of the suction filtration bottle opening, adding 50-60 drops of a 0.2% sodium diphenylaminesulfonate indicator in each 1 g of reduced iron test sample, titrating by using a sodium diphenylaminesulfonate standard solution until the solution is of a stable bluish violet, recording a volume of the consumed potassium dichromate standard solution, and calculating the content of metal iron according to a formula. The method prevents the metal iron from being oxidized, and is good in repeatability and accurate in measurement; the measurement accuracy of test sample testing is within 1.0 percent.

Description

technical field [0001] The invention relates to a test method for iron content, in particular to a test method for total iron content in steelmaking auxiliary material direct reduced iron. technical background [0002] The use of non-metallic materials and non-ferrous metals in steel has increased, resulting in a continuous decline in the quality of scrap steel. Scrap steel is used as a raw material for steelmaking. Due to its different sources, its chemical composition fluctuates greatly, and it is difficult to grasp and control, which brings great difficulties to steelmaking operations. [0003] Direct reduced iron (DRI-Direct Reduced Iron) is a low-carbon porous substance formed by fine iron powder or iron oxide reduced in a furnace at low temperature. Its chemical composition is stable and its impurity content is low. Due to the stable chemical composition of direct reduced iron, it can effectively dilute the content of residual and inclusion metal elements in steel, th...

Claims

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Application Information

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IPC IPC(8): G01N31/16
Inventor 吕琦崔隽李小杰沈克郭芳贾丽晖黄柏华古兵平朱慧
Owner 武汉钢铁有限公司
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