GB/T 8454-2020 in English

VALID

Reduced ilmenite powder for welding rob-Determination of ferrous iron content- Potassi um dichromate titrimetric method

Issued on:2020-06-02
Implemented on:2020-12-01
File Format:PDF
Delivery:Via email within 1~3 business days

Price(USD)： $130.00
$127.00

Standard No:	GB/T 8454-2020
Document status:	VALID
Title in English:	Reduced ilmenite powder for welding rob-Determination of ferrous iron content- Potassi um dichromate titrimetric method
Title in Chinese:	焊条用还原钛铁矿粉亚铁含量的测定重铬酸钾滴定法
Language:	English
File Format:	Electronic (PDF)
Delivery:	Via email within 1~3 business days
Issued on:	2020-06-02
Implemented on:	2020-12-01
Superseding:	GB/T 8454-1987 Determination of ferrous iron content in reduced ilmenite powder for welding rod
ICS Classification:	73.060.10-Iron ores
Chinese Classification:	D31-Iron ore
Professional Classification:	GB-National Standard
Related Keywords:	ferrous iron metallic iron % metallic iron titration reagent metallic iron + content- potassi um dichromate
Related Topics:	gb 8454 Potassium dichromate redox potential Reduction Potential of Potassium Dichromate Potassium dichromate redox potential Titration of potassium nitrate content Potassium dichromate standard solution iron content standard Potassium dichromate standard solution Standard Potassium Dichromate Solution Standard Potassium Dichromate Solution Cod Determination Potassium Dichromate Method Cod Determination Potassium Dichromate Method Potassium ferric dichromate The concentration of potassium dichromate solution Potassium dichromate standard solution Cod Determination Potassium Dichromate Method Potassium dichromate + standard solution Potassium dichromate + iron also quantitative method ferrous iron Iron titration Potassium dichromate solution Potassium dichromate standard solution,,, Potassium dichromate standard solution,, Potassium dichromate standard solution Potassium dichromate standard solution feo Redox Potential of Potassium Dichromate Oxidation and reduction of potassium dichromate Potassium dichromate and ammonium ferrous sulfate Iron mass fraction The content of potassium dichromate Potassium dichromate is reduced Ferrous Sulfate and Potassium Dichromate Potassium dichromate and ferrous sulfate Ammonium Ferrous Sulfate and Potassium Dichromate Cod Determination Potassium Dichromate Method Determination of Titanium by Potassium Dichromate Potassium dichromate reduction ammonium ferrous sulfate and potassium dichromate Potassium titration Solution concentration of potassium dichromate Potassium dichromate use Determination of Potassium Dichromate GB/T 8454-1987 Cod Determination Potassium Dichromate Method Reduced ilmenite powder Cod Determination Potassium Dichromate Method GBT8454 GB/T 8454-1987 GB/T 8454-2020 iron content Potassium dichromate titration solution Chlorine content of reduced carbon powder Iron Concentrate Heavy Chromium Titration Titration of reduction potential of insurance powder Indicator for determination of reducing sugar content by potassium permanganate titration method Acid potassium dichromate detects ethanol content Ferrous ion titration masking agent Titration principle of alum limit Determination of reducing sugar by potassium permanganate titration method GB T 6730.8-2016 Determination of ferrous iron content in iron ore - Potassium dichromate titration method The principle of measuring reducing sugar by potassium ferricyanide method Disadvantages of the potassium ferricyanide method for determining reducing sugars Steps for determining iron content using potassium dichromate Determination of reducing sugars by potassium ferricyanide method Ferrous ammonium sulfate calibrated potassium dichromate standard solution Determination of ferrous iron content by perchloric acid potentiometric titration What standard is used for the iron content in ferrous oxide powder? Ilmenite quality Iron ore powder testing National quality of reduced iron powder Determination of iron powder magnetic content Method for calibrating ferrous sulfate with potassium dichromate Determination of ferrous iron content How to titrate potassium dichromate with oxalic acid Determination method of iron content in chromium ore Determination method for lead content in ilmenite Titration method for ferrous ions Potassium dichromate redox method Method for determination of alcohol using potassium dichromate Determination of ferrous iron in rocks and minerals by titration method Reduced ilmenite Method for measuring methanol using potassium dichromate Potassium ferrocyanide method for determining reducibility Ferrous oxalate content determination

《GB/T 8454-2020焊条用还原钛铁矿粉亚铁含量的测定重铬酸钾滴定法》由TC317（全国铁矿石与直接还原铁标准化技术委员会）归口，主管部门为中国钢铁工业协会。

Introduction

Analysis of the core content of the standard

Main technical changes:

New safety warning clauses and normative references
Measurement range adjusted to 1.00%~10.00%
Metallic iron titration reagent changed from mercurous nitrate to potassium dichromate
Added blank test and sodium bicarbonate protection measures

Measurement principle and process

Measurement items	Dissolution system	Titration reagent	Calculation formula
Metallic iron + ferrous iron total amount	Ammonium fluoride-sulfuric acid-hydrochloric acid	Potassium dichromate	A=(V1-Vblank)×C×55.85×100/m0
Metallic iron alone	Ferric chloride solution	Potassium dichromate	B=(V4-Vblank)×C×55.85×250×100/(m1×50)

Ferrous content calculation formula: FeO = 1.2865 × (A - B)

Key technical requirements

Precision control indicators:

Repeatability limit (r): 0.30%
Reproducibility limit (R): 0.60%

Key instruments:

Non-magnetic stirring bar (PTFE coated)
Adjustable speed magnetic stirrer
Class A glass measuring vessel (in line with GB/T12805-12808)

Implementation suggestions

Operation points:

The dissolution process must be strictly isolated from air and protected by sodium bicarbonate
When leaching metallic iron, the stirring time is controlled at 60±5 minutes
The endpoint is determined by maintaining a stable purple color for 15 seconds
If the difference between parallel samples exceeds 0.30%, re-measurement is required

Quality control measures:

Each batch of samples should be monitored with standard substances
Perform regular inter-laboratory comparisons
The reagent blank value should be less than 0.05mL

More samples: JJG 21-2008 GB 50021-2001(2009) JGJ 94-2008

Sample only — not a preview of GB/T 8454-2020

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