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Procedures to determine metallic iron content in steel slag
Appendix 2: Procedures to determine metallic iron content in steel slag
The following was adopted by the author in research to determine metallic iron content in steel slag. Determination of metallic iron content in steel slag 1. Reagents and chemicals a. 10% Copper sulfate (CuSO4); b. 1:1 Sulfuric acid (H2SO4); c. Strong phosphoric acid (H3PO4); d. 0.1 N potassium dichromate (K2Cr2O7s volumetric standard); e. 1% bromocresol indicator; f. Metallic aluminum (foil, 0.5 mm thick). 2. Procedure a. Weigh about one gram sample passing 0.075 mm sieve, put the sample into a 400 ml beaker; b. Add 20–25 ml 10% copper sulfate solution and dilute with 20–25 ml hot water. Boil for 15 minutes and add water to keep 50 ml volume totally; c. Filter and wash with hot water and dilute to 100 ml. Add 14 ml 1:1 sulfuric acid and a piece of metallic aluminum; d. Keep boiling until all copper settles, then cool, filter, and wash with cool water, dilute to 250 ml. Add 3 drops of bromocresol indicator and 5 ml strong phosphoric acid. Titrate using 0.1 N potassium dichromate until purple color occurs. 3. Calculation of metallic iron content in steel slag
Fe% = N ´ V ´ 0.05585 ´ 100 G where N = Potassium dichromate standard solution; V = Volume of potassium dichromate consumed for titration (ml); G = Weight of sample (g); 0.05585 = Weight (g) of metallic iron per mg equivalence.
The following was adopted by the author in research to determine metallic iron content in steel slag. Determination of metallic iron content in steel slag 1. Reagents and chemicals a. 10% Copper sulfate (CuSO4); b. 1:1 Sulfuric acid (H2SO4); c. Strong phosphoric acid (H3PO4); d. 0.1 N potassium dichromate (K2Cr2O7s volumetric standard); e. 1% bromocresol indicator; f. Metallic aluminum (foil, 0.5 mm thick). 2. Procedure a. Weigh about one gram sample passing 0.075 mm sieve, put the sample into a 400 ml beaker; b. Add 20–25 ml 10% copper sulfate solution and dilute with 20–25 ml hot water. Boil for 15 minutes and add water to keep 50 ml volume totally; c. Filter and wash with hot water and dilute to 100 ml. Add 14 ml 1:1 sulfuric acid and a piece of metallic aluminum; d. Keep boiling until all copper settles, then cool, filter, and wash with cool water, dilute to 250 ml. Add 3 drops of bromocresol indicator and 5 ml strong phosphoric acid. Titrate using 0.1 N potassium dichromate until purple color occurs. 3. Calculation of metallic iron content in steel slag
Fe% = N ´ V ´ 0.05585 ´ 100 G where N = Potassium dichromate standard solution; V = Volume of potassium dichromate consumed for titration (ml); G = Weight of sample (g); 0.05585 = Weight (g) of metallic iron per mg equivalence.