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Detection method of reducing atmosphere in cement clinker calcination process

A technology of cement clinker and detection method, which is applied in the direction of analysis by chemical reaction of materials and material analysis by observing the influence of chemical indicators, which can solve the large controversy in the judgment of reducing atmosphere and the large fluctuation of clinker quality. and other problems, to achieve the effect of scientific and reliable test results, easy operation and simple method

Active Publication Date: 2018-02-13
清水河县蒙西水泥有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The matching of wind and coal in the cement clinker calcination process is very important. If there is a deviation, different degrees of "yellow core" will be produced. Generally, the factory observes through the eyes of the post workers, and there is no unified judgment standard. The same material is different. People will have different answers after reading it, and can only judge by feeling and experience, resulting in large fluctuations in the quality of clinker, and the judgment of the reduction atmosphere is very controversial

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Embodiment 1: method for detecting reducing atmosphere during cement clinker calcination, which comprises the following steps: (1) clinker grinding; (2) weighing the clinker after grinding; (3) titrating with 2.2'-bipyridine solution ;in,

[0015] (1) Grinding of clinker: Grinding the clinker out of the kiln into a fine powder with a 0.08mm sieve residue of less than 1.5%;

[0016] (2) Weigh the ground clinker: weigh 10 mg of the ground clinker in step (1) and place it in the gray dish;

[0017] (3) Titration with 2.2'-bipyridine solution: titrate 2 drops of 2.2'-bipyridine solution in the clinker described in the gray dish, and the 2.2'-bipyridine solution turns red within 2 minutes after titration, indicating that there is Reducing atmosphere, that is, the presence of divalent iron ions in the clinker. 2. 2'-bipyridyl solution is a redox indicator for identifying ferrous ions, and its solution will appear red when it encounters ferrous salts. Wherein, the 2.2'-bipy...

Embodiment 2

[0018] Embodiment 2: method for detecting reducing atmosphere during cement clinker calcination, which comprises the following steps: (1) clinker grinding; (2) weighing the clinker after grinding; (3) titrating with 2.2'-bipyridine solution ;in,

[0019] (1) Grinding of clinker: Grinding the clinker out of the kiln into a fine powder with a 0.08mm sieve residue of less than 1.5%;

[0020] (2) Weigh the ground clinker: weigh 15 mg of the ground clinker in step (1) and place it in the gray dish;

[0021] (3) Titration with 2.2'-bipyridine solution: titrate 3 drops of 2.2'-bipyridine solution into the clinker in the gray dish, after titration, the 2.2'-bipyridine solution turns yellow slightly within 2 minutes, and then pour it into the gray dish Add two drops of trisodium citrate solution to the clinker and wait for 5 minutes. The trisodium citrate solution turns red, indicating that there is a small amount of divalent iron ions in the clinker, that is, there is a reducing atmo...

Embodiment 3

[0022] Embodiment 3: method for detecting reducing atmosphere during cement clinker calcination, it comprises the following steps: (1) clinker grinding; (2) weighing the clinker after grinding; (3) titrating with 2.2'-bipyridine solution ;in,

[0023] (1) Grinding of clinker: Grinding the clinker out of the kiln into a fine powder with a 0.08mm sieve residue of less than 1.5%;

[0024] (2) Weigh the ground clinker: weigh 13 mg of the ground clinker in step (1) and place it in the gray dish;

[0025] (3) Titration with 2.2'-bipyridine solution: titrate 3 drops of 2.2'-bipyridine solution into the clinker in the gray dish. After titration, the 2.2'-bipyridine solution did not turn red within 2 minutes. Add two drops of trisodium citrate solution to the material and wait for 5 minutes. If the trisodium citrate solution turns red, it indicates that there is a small amount of divalent iron ions in the clinker, that is, there is a reducing atmosphere in the clinker. Wherein, the 2...

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Abstract

The invention discloses a method for detecting reducing atmosphere in the cement clinker calcining process, which comprises the following steps: (1) clinker grinding; (2) weighing the ground clinker; (3) titrating with 2.2,-bipyridine solution . The advantages of the present invention: through the method of the present invention, it is possible to objectively and accurately determine whether there is ferrous iron in the clinker, and then it is possible to more accurately determine whether a reducing atmosphere is generated during the cement clinker calcination process, and analyze the cause of the reducing atmosphere in time and can Take effective measures in time to improve the calcination atmosphere of cement clinker, so as to ensure the quality of cement clinker. The method of the invention is simple, easy to operate, low in cost, and the detection result is scientific and reliable.

Description

Technical field: [0001] The invention relates to a method for detecting a reducing atmosphere, in particular to a method for detecting a reducing atmosphere during the calcining of cement clinker. Background technique: [0002] During the calcination process of cement clinker, a reducing atmosphere will be generated in the kiln due to the mismatch of wind and coal, such as: excessive coal head, poor ventilation in the kiln, or problems with the operation and positioning of the coal injection pipe, resulting in a reducing atmosphere in the clinker , and the human naked eye cannot judge the existence of reducing atmosphere. [0003] During the calcination of cement clinker, a reducing atmosphere will be generated due to the mismatch between wind and coal, and Fe +3 is reduced to Fe +2 It turns yellow, and when it comes to the firing zone or cooling zone (cooler), the surface of the clinker is oxidized again after contact with fresh air, but the inside remains yellow due to s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/78
Inventor 呼志刚王海东于晓明贾爱明蔡高平莘守业陈玉娜
Owner 清水河县蒙西水泥有限公司