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GB/T 38216.4-2024: Steel slag - Determination of total iron content - Titanium(III) chloride-potassium dichromate titration methods
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Steel slag - Determination of total iron content - Titanium(III) chloride-potassium dichromate titration methods
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GB/T 38216.4-2024
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Basic data | Standard ID | GB/T 38216.4-2024 (GB/T38216.4-2024) | | Description (Translated English) | Steel slag - Determination of total iron content - Titanium(III) chloride-potassium dichromate titration methods | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | H54 | | Classification of International Standard | 77.140.99 | | Word Count Estimation | 10,173 | | Date of Issue | 2024-09-29 | | Date of Implementation | 2025-04-01 | | Issuing agency(ies) | State Administration for Market Regulation, China National Standardization Administration | GB/T 38216.4-2024: Steel slag - Determination of total iron content - Titanium(III) chloride-potassium dichromate titration methods
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Steel slag - Determination of total iron content - Titanium(Ⅲ) chloride-potassium dichromate titration methods
Determination of total iron content in steel slag
Titanium trichloride-potassium dichromate titration method
Steel slag-Determination of total iron content-Titanium (Ⅲ)
chloride-potassium dichromate titration methods
ICS 77.140.99
CCS H 54
National Standard of the People's Republic of China
Released on 2024-09-29
2025-04-01 Implementation
State Administration for Market Regulation
The National Standardization Administration issued
Foreword
This document is in accordance with the provisions of GB/T 1.1-2020 "Guidelines for standardization work Part 1.Structure and drafting rules for standardization documents"
Drafting is required.
This document is Part 4 of GB/T 38216.GB/T 38216 has published the following parts.
Determination of chromium oxide content in steel slag - Diphenylcarbazide spectrophotometric method (GB/T 38216.1);
Determination of fluorine and chlorine content in steel slag - Ion chromatography (GB/T 38216.2);
Determination of free calcium oxide content in steel slag by EDTA titration and thermogravimetric analysis (GB/T 38216.3);
Determination of total iron content in steel slag - Titanium trichloride x potassium dichromate titration method (GB/T 38216.4);
Determination of manganese oxide content in steel slag by flame atomic absorption spectrometry (GB/T 38216.5).
Please note that some of the contents of this document may involve patents. The issuing organization of this document does not assume the responsibility for identifying patents.
This document was proposed by the China Iron and Steel Association.
This document is under the jurisdiction of the National Technical Committee on Steel Standardization (SAC/TC 183).
This document was drafted by. Shanghai Meishan Iron and Steel Co., Ltd., Ruizhilu (Hangzhou) Technology Co., Ltd., Shandong Iron and Steel Group Rizhao
Co., Ltd., Chengdu Advanced Metal Materials Industry Technology Research Institute Co., Ltd., Shougang Group Co., Ltd., Beijing Forestry University, Dalian
Kemeng Engineering Materials Co., Ltd., Metallurgical Industry Information Standards Research Institute, Inner Mongolia Huayizhuo Materials Technology Co., Ltd., Beijing-Tianjin-Hebei Iron and Steel Alliance
(Qian'an) Collaborative Innovation Research Institute Co., Ltd.
The main drafters of this document are. He Zhiming, Huang Fei, Wang Xiaojie, Yang Jinguang, He Ping, Qiu Jinhui, Wu Yiqing, Wang Ju, Wen Wei,
Xue Ying, Wang Jiangwei, Sun Xiangyang, Zhu Qian, Zhang Ruopeng, Chen Jian, Gao Lianghao, Liu Yusong, Luan Caixia, Feng Junkai, Yang Zhiqiang, Wang Rendong,
Li Qiuxia, Wu Zhaohui, Zhao Jingjing, Wang Qiang, Sun Rongguo, Cheng Weihua, Gao Shuping, and Zhang Ruichao.
Introduction
Steel slag is a by-product of the steelmaking process, containing iron (TFe), iron oxide, calcium oxide, magnesium oxide, sulfur trioxide,
Carbon, silicon dioxide, aluminum oxide, phosphorus pentoxide, zinc oxide, chromium oxide and other ingredients, as well as anions such as fluorine and chlorine.
After processing, part of the steel slag can be returned to the steel industry as raw materials; the stabilized steel slag is a good green material that can replace part of
Natural materials. In the comprehensive utilization standard system of metallurgical solid waste resources, the determination method of chemical composition of steel slag is a very important part.
GB/T 38216 "Steel Slag" serves the treatment, processing, trade and application of steel slag.
To provide technical support for the high-quality green development of the steel industry, it is planned to consist of five parts.
Determination of chromium oxide content in steel slag - Diphenylcarbazide spectrophotometric method (GB/T 38216.1);
Determination of fluorine and chlorine content in steel slag - Ion chromatography (GB/T 38216.2);
Determination of free calcium oxide content in steel slag by EDTA titration and thermogravimetric analysis (GB/T 38216.3);
Determination of total iron content in steel slag - Titanium trichloride x potassium dichromate titration method (GB/T 38216.4);
Determination of manganese oxide content in steel slag by flame atomic absorption spectrometry (GB/T 38216.5).
Determination of total iron content in steel slag
Titanium trichloride-potassium dichromate titration method
WARNING—Persons using this document should have practical experience in formal laboratory work. This document does not purport to address all possible safety issues.
The user is responsible for taking appropriate safety and health measures and ensuring compliance with relevant national laws and regulations.
1 Scope
This document describes a method for the determination of total iron content by titration with potassium dichromate reduced by titanium trichloride.
This document is applicable to the determination of total iron content in steel slag, including converter slag, electric furnace slag, refined slag, etc. Determination range (mass fraction).
1.0%～35.0%.
2 Normative references
The contents of the following documents constitute the essential clauses of this document through normative references in this document.
For referenced documents without a date, only the version corresponding to that date applies to this document; for referenced documents without a date, the latest version (including all amendments) applies.
in this document.
GB/T 2007.2 General rules for sampling and sample preparation of bulk mineral products - Manual sample preparation method
GB/T 6682 Specifications and test methods for water used in analytical laboratories
GB/T 8170 Rules for rounding off values and expression and determination of limit values
GB/T 12805 Laboratory glassware - Burettes
GB/T 12806 Laboratory glassware Single-line volumetric flasks
GB/T 12808 Laboratory glassware - Single-line pipettes
3 Terms and definitions
There are no terms or definitions that require definition in this document.
4 Principle
The sample was heated and decomposed with sulfuric acid and phosphoric acid, and then most of the trivalent iron in the test solution was reduced with stannous chloride, and then sodium tungstate was used as an indicator.
Titanium dioxide reduces all the remaining trivalent iron to divalent iron to form "tungsten blue", and the excess reducing agent (or the air) is oxidized by dilute potassium dichromate solution.
In sulfuric acid and phosphoric acid medium, sodium diphenylamine sulfonate is used as an indicator and potassium dichromate standard titration solution is used to titrate the divalent
Iron, calculate the mass fraction of total iron.
5 Reagents
Unless otherwise specified, only reagents of analytical grade or above shall be used in the analysis, and the experimental water shall comply with the third grade specified in GB/T 6682.
The above distilled water and deionized water.
5.1 Sulfuric acid, ρ=1.84 g/mL.
5.2 Phosphoric acid, ρ=1.69 g/mL.
5.3 Sulfuric acid and phosphoric acid mixed acid, 3 3 4, that is, 3 parts of sulfuric acid (5.1) 3 parts of phosphoric acid (5.2) 4 parts of water.
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