Method for determining calcium oxide and magnesium oxide in iron slag grains

A method of determination, the technology of calcium oxide, is applied in the direction of material analysis by observing the influence of chemical indicators, the preparation of test samples, and the analysis by making materials undergo chemical reactions. Easy to filter, wide measurement range, and short analysis process due to cumbersome operation

Active Publication Date: 2014-04-30
SHENWU TECH GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The separation system of sodium sulfide-copper reagent (sodium diethyldithiocarbamate) is similar to the separation system of ammonia a

Method used

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  • Method for determining calcium oxide and magnesium oxide in iron slag grains
  • Method for determining calcium oxide and magnesium oxide in iron slag grains
  • Method for determining calcium oxide and magnesium oxide in iron slag grains

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] 1. Preparation and calibration of standard solution:

[0028] 1A. Preparation of 0.01mol / L EDTA standard solution: Weigh 3.75g analytically pure EDTA (tetraethylamine disodium oxalate) into a 500ml beaker, add about 200ml of water, heat to 60-70℃ to dissolve, cool, Dilute to 1000ml, set aside after 1 week.

[0029] 1B. Preparation of calcium oxide standard solution: accurately weigh 1.0009g of calcium carbonate (mass fraction of 99.995%) which has been dried at 105°C for 2 hours and cooled to room temperature in a desiccator, placed in a 250ml beaker, added 50ml of water, and covered the surface Add 20ml of 1:1 (hydrochloric acid to water volume ratio 1:1) from the mouth of the cup, and heat to dissolve it, boil for 1-2 minutes, cool to room temperature, transfer to a 1000ml volumetric flask, dilute with water to Scale, the concentration of this calcium oxide standard solution is 0.01mol / L.

[0030] 1C. Calibration: Draw three portions of 20ml 1B in a 250ml beaker, add water...

Embodiment 2

[0059] 1. Preparation and calibration of standard solution: the same as Example 1

[0060] 2. Preparation of the solution to be tested:

[0061] Accurately weigh 0.2500g of vanadium-titanium ore grain iron slag sample, and prepare the filtrate to be tested in the same steps as in Example 1.

[0062] 3. Titration of calcium oxide:

[0063] Pipette 50ml filtrate into a 250ml beaker, adjust the volume to about 100ml with water, add 5ml 1:1 triethanolamine (volume ratio of triethanolamine to water=1:1), adjust pH ≥12 with 20% sodium hydroxide, add calcium carboxylic acid With a little indicator, titrate with 1A EDTA standard solution until the solution turns from red to pure blue as the end point. Note that the consumption of EDTA standard solution is 5.85ml.

[0064] Calculation of calcium oxide content Ca 0 % = C X V 1 X 0.05608 m X 100

[0065] In this embodiment, m is 0.05 g, and the calculated mass fraction of calcium oxide is 6.56%.

[0066] 4. Titrati...

Embodiment 3

[0070] 1. Preparation and calibration of standard solution: the same as Example 1

[0071] 2. Preparation of the solution to be tested:

[0072] Accurately weigh 0.2500g of iron ore granular iron slag sample, and the steps are the same as in Example 1 to prepare the filtrate to be tested.

[0073] 3. Titration of calcium oxide:

[0074] Pipette 50ml filtrate into a 250ml beaker, adjust the volume to about 100ml with water, add 5ml 1:1 triethanolamine (volume ratio of triethanolamine to water=1:1), adjust pH ≥12 with 20% sodium hydroxide, add calcium carboxylic acid With a little indicator, titrate with 1A EDTA standard solution until the solution turns from red to pure blue as the end point. Note that the consumption of EDTA standard solution is 18.20ml.

[0075] Calculation of calcium oxide content Ca 0 % = C X V 1 X 0.05608 m X 100

[0076] In this embodiment, m is 0.05 g, and the calculated mass fraction of calcium oxide is 20.41%.

[0077] 4. Titrati...

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Abstract

The invention provides a method for determining calcium oxide and magnesium oxide in iron slag grains. The determination method comprises the following steps: weighing a sample; heating and dissolving by using acid; adding perchloric acid until the perchloric acid is fumed at a wet salt state; cooling, adding a 20% hexamethylenetetramine solution to adjust the pH (Potential of Hydrogen) value to 7-8, and preserving the temperature; adding a 1% copper reagent, diluting by water and filtering, wherein a filtering solution is a solution to be detected; separately taking the filtering solution, and mixing with the water; adding 1:1 triethanolamine and adjusting the pH to be more than 12 by using 20% potassium hydroxide; adding a calcium carboxylic acid indication agent; titrating by using an EDTA (Ethylene Diamine Tetraacetic Acid) standard solution and calculating the mass percent of the calcium oxide according to a formula shown in the specification; separately taking the filtering solution and mixing with the water in a ratio of 1:1, wherein the amount of the filtering solution is the same as that in the step 4; adding the 1:1 triethanolamine and adding an ammonia buffering solution with the pH of 10; adding a 1% chromium black T indication agent and titrating by using the EDTA standard solution; and calculating the mass percent of the magnesium oxide according to a formula shown in the specification. The method is short in flow and high in speed, and the aims of simplicity, rapidness and accuracy are realized.

Description

Technical field [0001] The invention relates to a method for measuring calcium oxide and magnesium oxide in the field of iron and steel metallurgy, in particular to a method for measuring calcium oxide and magnesium oxide in iron slag. Background technique [0002] The granular iron method-ITMK3 is the third generation coal-based direct reduction ironmaking technology. The process uses iron ore, laterite nickel ore, vanadium ilmenite and other iron ore powder and coal powder as the main raw materials to make carbon-containing pellets. At a relatively low temperature, the pellets are oxidized in only about 10 minutes. Iron reacts in the gas-solid two phases and is quickly reduced to metallic iron, which can be cleanly separated from the slag. The process flow is short and emissions are low, which is beneficial to saving energy consumption and protecting the environment. The latest ironmaking process is currently being developed and tested in the world. The alkalinity of the fin...

Claims

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Application Information

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IPC IPC(8): G01N21/78G01N1/28G01N1/38G01N1/44
Inventor 吴道洪孙雅茹
Owner SHENWU TECH GRP CO LTD
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