Method for determination of metallic iron content in reduced pellets
A determination method and technology for iron content, which are used in chemical analysis by titration, measurement device, preparation of samples for testing, etc. Reduction of the content of metallic iron in pellets to achieve high accuracy
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Embodiment 1
[0033] The reduced pellet sample submitted for inspection was named No. 1, and the metal iron content of the No. 1 sample was determined;
[0034] 1) Determination of the quality of the sample: pulverize the No. 1 sample, and then pass through a 140-mesh sample sieve, wherein the part passing through the sample sieve is the under-sieve sample, with a total mass of m 2 =20.5g, the average particle size is 0.08mm, the part that has not passed through the sample sieve is the sample on the sieve, and the total mass is m 1 =35.2g, the average particle size is 2.5mm;
[0035] 2) Determination of the content of metallic iron in the sample on the sieve: take three parts of the sample on the sieve, and the quality is controlled at about 0.10g, respectively m a =0.1031g, m b =0.1025g, m c=0.1065g, carry out parallel determination experiment simultaneously, place the sample on the sieve in the conical flask of dry 250mL respectively, then add 2g sodium bicarbonate simultaneously in ea...
Embodiment 2
[0059] The reduced pellet sample submitted for inspection was named No. 2, and the iron content of the No. 2 sample was determined;
[0060] 1) Take the quality of the sample: pulverize the No. 2 sample, then pass through a 130-mesh sample sieve, the part that passes through the sample sieve is the under-sieve sample, and its total mass is m 2 =22.5g, the average particle size is 0.090mm, the part that has not passed through the sample sieve is the sample on the sieve, and its total mass is m 1 =46.0g, the average particle size is 2.1mm;
[0061] 2) Determination of the content of metallic iron in the sample on the sieve: take three parts of the sample on the sieve, and the quality is all controlled at about 0.20g, respectively m a =0.1998g, m b =0.2015g, m c =0.2004g, carry out parallel determination experiment simultaneously, three parts of samples on the sieve are respectively placed in the Erlenmeyer flask of dry 500mL, then add 4g sodium bicarbonate simultaneously in e...
Embodiment 3
[0084] The reduced pellet sample submitted for inspection was named No. 3, and the iron content of No. 3 sample was determined;
[0085] 1) Take the quality of the sample: pulverize the No. 3 sample, then pass through a 150-mesh sample sieve, the part that passes through the sample sieve is the under-sieve sample, and its total mass is m 2 =18.2g, the average particle size is 0.085mm, the part that does not pass through the sample sieve is the sample on the sieve, and its total mass is m 1 =50.6g, the average particle size is 2.74mm;
[0086] 2) Determination of the content of metallic iron in the sample on the sieve: take three parts of the sample on the sieve, and the quality is controlled at about 0.10g, respectively m a =0.0998g, m b =0.1012g, m c =0.1005g, carry out parallel determination experiment simultaneously, three parts of samples on the sieve are respectively placed in dry 250mL flasks, feed nitrogen continuously into the flasks, add 20mL of sodium fluoride sol...
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