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Determination method of calcium oxide and magnesium oxide in granulated iron slag

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: 2017-03-29
SHENWU TECH GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The separation system of sodium sulfide-copper reagent (sodium diethyldithiocarbamate) is similar to the separation system of ammonia ammonium chloride, forming colloidal precipitates, slow filtration speed, easy to adsorb, cumbersome to operate, and difficult to master

Method used

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  • Determination method of calcium oxide and magnesium oxide in granulated iron slag
  • Determination method of calcium oxide and magnesium oxide in granulated iron slag

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

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

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

[0029] 1B. Calcium oxide standard solution preparation: Accurately weigh 1.0009g of calcium carbonate (mass fraction 99.995%) that was dried at 105°C for 2 hours and cooled to room temperature in a desiccator, put it in a 250ml beaker, add 50ml of water, and cover the surface Carefully add 1:1 (hydrochloric acid to water volume ratio 1:1) hydrochloric acid 20ml from the mouth of the cup, heat to dissolve, boil for 1-2 minutes, cool to room temperature, transfer to a 1000ml liter volumetric flask, dilute with water to scale, the calcium oxide standard solution concentration is 0.01mol / L.

[0030] 1C. Calibration: Draw three parts of 20ml1B into a 250ml bea...

Embodiment 2

[0059] 1. The preparation and calibration of the standard solution: the same as in Example 1

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

[0061] Accurately weigh 0.2500g vanadium-titanium ore particle iron slag sample, and make the filtrate to be tested in the same manner as in Example 1.

[0062] 3. Titration of calcium oxide:

[0063] Draw 50ml of filtrate into a 250ml beaker, adjust the volume to about 100ml with water, add 1:1 triethanolamine (triethanolamine to water volume ratio = 1:1) 5ml, use 20% sodium hydroxide to adjust the pH value to ≥12, 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, and record the consumed EDTA standard solution as 5.85ml.

[0064] Calcium Oxide Calculation

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

[0066] 4. Titration of calcium oxide and magnesium content: dra...

Embodiment 3

[0070] 1. The preparation and calibration of the standard solution: the same as in Example 1

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

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

[0073] 3. Titration of calcium oxide:

[0074] Draw 50ml of filtrate into a 250ml beaker, adjust the volume to about 100ml with water, add 1:1 triethanolamine (triethanolamine to water volume ratio = 1:1) 5ml, use 20% sodium hydroxide to adjust the pH value to ≥12, 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, and record the consumed EDTA standard solution as 18.20ml.

[0075] Calcium Oxide Calculation

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

[0077] 4. Titration of calcium oxide and magnesium content: draw 50ml of filtrate in...

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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 granular iron slag. Background technique [0002] Granular Iron Ironmaking-ITMK3 is the third generation coal-based direct reduction ironmaking technology. The process uses iron ore powder such as iron ore, laterite nickel ore, vanadium-titanium iron ore and coal powder as the main raw materials to make carbon-containing pellets. At a relatively low temperature, it only takes about 10 minutes to oxidize in the pellets. Iron reacts in the gas-solid two-phase, and is quickly reduced to metallic iron, which can be cleanly separated from the slag. The technological process is short and discharges less, which is beneficial to saving energy consumption and protecting the environment. At present, the latest iron-making process is being developed and tested in...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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