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Method for detecting content of active calcium oxide and non-active calcium oxide in lime

A technology of activated calcium oxide and detection method, which is applied in the direction of material analysis by observing the influence of chemical indicators, and analysis by making materials undergo chemical reactions, etc. Determination and other problems, to achieve the effect of short time-consuming, good promotion and application prospects, and rapid dissolution

Active Publication Date: 2015-01-21
WUKUN STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the difficulty, there is no effective method to measure the content of active calcium oxide and inactive calcium oxide in lime

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0091] Experimental materials: The lime samples to be tested were taken from the Longshan Mine of Kunming Iron and Steel Co., Ltd.

[0092] Magnesium oxide standard solution is prepared according to the following method: weigh 1.0000g of magnesium oxide that has been previously burned at 850°C and cooled to room temperature in a desiccator, put it in a 250ml beaker, add 20mL of water, mix well, and cover with a watch glass , add 20mL of 20% hydrochloric acid, heat to dissolve at 108°C, cool, transfer to a 1000mL volumetric flask, dilute to the mark with water, and mix well.

[0093] The EDTA standard solution was prepared as follows: Weigh 3.73g disodium edetate into a 500ml beaker, add 100mL water, heat to dissolve at 108°C, cool to room temperature, transfer to a 1000mL volumetric flask, Dilute to the mark with water and shake well to obtain the standard solution.

[0094] EDTA standard solution is calibrated according to the following method: pipette 3 parts of 20.00 mL c...

Embodiment 2

[0126] Experimental materials: The lime samples to be tested were taken from the Longshan Mine of Kunming Iron and Steel Co., Ltd. All the other medicines and reagents are the same as in Example 1. .

[0127] Experimental equipment: with embodiment 1.

[0128] Experimental method: crush the lime sample to be tested to 0.125mm≤particle size≤0.150mm, and dry it at 105°C for 2.5h.

[0129] Take a 0.5000g sample and a total of 4g of anhydrous sodium carbonate: boric acid = 3:2 blend on quantitative filter paper, wrap it with quantitative filter paper and place it in an iron crucible with a 1.0mm thick graphite layer as the bottom , put the iron crucible at 880°C for 24 minutes, take it out and cool it, put the frit in a beaker filled with 60ml of 8% hydrochloric acid solution, cover the beaker with a watch glass, and heat the beaker at 100°C to make the frit Dissolve until the solution is clear. After cooling to room temperature, transfer the solution into a 250ml volumetric ...

Embodiment 3

[0154] Experimental materials: The lime samples to be tested were taken from the Longshan Mine of Kunming Iron and Steel Co., Ltd. All the other medicines and reagents are the same as in Example 1. .

[0155] Experimental equipment: with embodiment 1.

[0156] Experimental method: crush the lime sample to be tested to 0.125mm≤particle size≤0.150mm, and dry it at 110°C for 1.5h.

[0157] Take a 0.5000g sample and a total of 4g of anhydrous sodium carbonate: boric acid = 3:2 blend, mix evenly on quantitative filter paper, wrap it with quantitative filter paper and place it in an iron crucible with a 0.7mm thick graphite layer as the bottom , put the iron crucible at 920°C for 16 minutes, take it out and cool it, put the frit in a beaker filled with 60ml of 8% hydrochloric acid solution, cover the beaker with a watch glass, and heat the beaker at 110°C to make the frit Dissolve until the solution is clear. After cooling to room temperature, transfer the solution into a 250ml...

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Abstract

The invention discloses a method for detecting the content of active calcium oxide and non-active calcium oxide in lime. The method comprises the steps of crushing lime until the particle diameter is less than or equal to 0.150mm, and drying at 105-110 DEG C for 1.5-2.5 hours; taking 0.5000g of a test sample, and mixing with a blend of 4g of anhydrous sodium carbonate and boric acid, fusing at 880-920 DEG C for 16-24 minutes, putting the fused blocks into 60ml of 8% hydrochloric acid and dissolving at 100-110 DEG C, enabling the volume of a solution to be constant by a 250ml volumetric flask so as to obtain a test solution a; taking 0.5000g of a test sample additionally, adding 5g of saccharose and 45-55ml of water which is boiled firstly and then cooled, vibrating closely for 18-22 minutes, enabling the volume of the solution to be constant by a 250ml volumetric flask so as to obtain a test solution b; removing 50.00ml of the test solution a and the test solution b, and respectively adding 5ml of triethanolamine and 20% potassium hydroxide or sodium hydroxide, so that the pH value of the test solution is greater than or equal to 12.5; then adding 4-5 drops of 1mg / ml magnesium oxide standard solution and 2-3 drops of calconcarboxylic acid, titrating the test solution by an EDTA standard solution until the test solution turns blue from red. The content of the active calcium oxide is calculated according to the following formula as shown in the specification, and the content of the non-active calcium oxide is calculated according to the following formula as shown in the specification, wherein W does not refer to CaO=WTCaO_WfCaO. The method is used for rapidly and accurately detecting the content of the active calcium oxide and non-active calcium oxide in a lime test sample, and is high in popularization and application value.

Description

technical field [0001] The invention belongs to the technical field of detection of oxide content of smelting raw materials, and in particular relates to a detection method for the content of active calcium oxide and inactive calcium oxide in lime. Background technique [0002] The main components of lime are CaO, SiO 2 , MgO, Fe 2 o 3 、Al 2 o 3 , P, S, and loss on ignition. The conventional method for determining the above elements in lime is to detect according to the "Limestone Dolomite Chemical Analysis Method" in GB / T 3286 series standards, but the content of calcium oxide in lime determined by GB / T 3286 series standards includes lime activity The sum of calcium oxide and inactive calcium oxide cannot separate active calcium oxide from inactive calcium oxide. What reacts in metallurgical production is determined by the active calcium oxide in metallurgical lime, and has little to do with the inactive calcium oxide, that is, the calcium oxide generated by raw burni...

Claims

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Application Information

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IPC IPC(8): G01N21/78
Inventor 陶俊向青赵冰林辉高鸿宋春玲
Owner WUKUN STEEL
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