This method development lab explored the redox titration of potassium dichromate with an iron oxide ore dissolved in a concentrated nitric acid medium. While this experiment differed by the use of only the acid, it became well apparent that the chemistry of the nitric acid prevents the adequate determination of iron in the hematite ore.
The determination of reduction degree in a DR process is sensitive to the total iron in the ore and DRI. An accurate and high throughput analysis method for total iron has been developed.
This International Standard specifies a titrimetric method for the determination of the metallic iron content of reduced iron ores. This method is applicable to a concentration range of 57,5 % mass fraction to 90,5 % mass fraction of the metallic iron.
The basis of the metallic iron determination method in this study is the following chemical reaction: Fe + CuSO 4 FeSO 4 + Cu Solid metallic iron replaces the Cu2+ in the solution and becomes Fe2+. Solid metallic iron content can be determined by determining the Fe2+ content in the solution.
1.1 These test methods cover the determination of total iron in iron ores, concentrates, and agglomerates in the concentration range 30 % to 95 % iron. 1.2 The test methods in this standard are contained in the sections indicated as follows:
The mercuric chloride (equivalent to about 0.5 g of metallic mercury) used in one iron determination would impart a 2- ppM (parts per milliard) mercury concentration to some 50,000 gallons of water. As this is regarded as the allowable limit, a potential pollution hazard exists.
The student, having practised some of the above experiments, may proceed to the assay of an iron ore. Determination of Iron in Brown Iron Ore. Weigh up 1 gram of the dried and powdered ore, calcine in the cover of a platinum crucible, and dissolve up in an evaporating dish with 20 c.c. of strong hydrochloric acid.
Other methods for the determination of metallic iron include oxidation with iron(III),"-" displacement of silver by iron in Ag(NHa)4(SCN)i,16'16 measurement of hydrogen evolved by reaction with an acid,'7'18 con- version into iron(II) sulphide by fusion with sulphur, followed by determination of the hydrogen sulphide,19 reduction of lead ...
Closed crucible reduction of lump powdered mill scale or iron ore by coal: The sequential methodology and mechanism for optimization of process parameters. Advanced Powder Technology 2020, 31 (9), …
ISO 5416, Direct reduced iron — Determination of metallic iron — Bromine-methanol titrimetric method; ISO 11323, Iron ore and direct reduced iron — Vocabulary; 3 Terms and definitions. For the purposes of this document, the terms and definitions given in ISO 11323 apply.
Iron ores for blast furnace feedstocks — Determination of low-temperature reduction-disintegration indices by static method — Part 1: Reduction with CO, CO2, H2 and N2. 90.93. ISO/TC 102/SC 3. ISO 4696-2:1998. Iron ores — Static test for low-temperature reduction-disintegration — …
ISO 16878:2016 specifies a titrimetric method for the determination of the metallic iron content of reduced iron ores. This method is applicable to a concentration range of 57,5 % mass fraction to 90,5 % mass fraction of the metallic iron. NOTE The term "metallic iron" means those forms of iron not bonded to oxygen or not present as pyrite.
Determination of the Iron Weigh a 0.7 g samples of ore into 500 mL erlenmeyer flasks. Since the iron ore is very hygroscopic, weigh the sample on the same day you dry it. Plan to run 4 or 5 samples so that you will have 3 good ones to report. Have DRY erlenmeyer flasks for ease of weighing.
ISO 16878: 2016 – determination of metallic iron – Iron (III) chloride titrimetric method; ISO 5416:2006, Direct reduced iron – determination of metallic iron – Bromine-methanol titrimetric method; Both test methods specify titrimetric methods for determination of the mass fraction of metallic iron in reduced iron ores such as HBI and DRI.