A method for automatic control of moisture in sintering mixture

A technology for sintering mixtures and sintering mixtures, applied in the direction of chemical process analysis/design, etc.

Active Publication Date: 2019-09-27
山东诺德能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method is difficult to accurately adjust the amount of water added according to the target moisture

Method used

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  • A method for automatic control of moisture in sintering mixture
  • A method for automatic control of moisture in sintering mixture
  • A method for automatic control of moisture in sintering mixture

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0081] The raw materials used for sintering include iron-containing raw materials, flux and fuel. These raw materials all contain a certain amount of original moisture, but the moisture value cannot meet the requirements of sintering. Add moisture when mixing and secondary mixing. The main purpose of primary mixing is to add water to moisten and mix evenly, so that the water content, particle size and components in the material can be evenly distributed, while the secondary mixing should not only continue to mix, but also carry out supplementary wetting. The main purpose is to granulate .

[0082] The sintered material contains crystallization water and physical water, the former mainly comes from the ore itself, and the latter comes from the externally added water of the material. Adding water to the powdery sintering material is mainly to help the mixture into balls and granules, and to improve the air permeability of the material layer; secondly, during the sintering proce...

Embodiment 2

[0114] Using the amount of water calculated in Example 1, by setting the amount of water added in the first mixing and second mixing, the final moisture of the sintering machine is further estimated, and the final moisture is H 3

[0115]

[0116] A 2 : Water content of the mixture after first mixing, A 2 =(1-γ 2 )*(A 1 +W 2 -W S2 -W B2 );

[0117] gamma 3 : Water evaporation rate of the secondary mixture, γ 3 The value of is 1~5%, and the present embodiment is 1%;

[0118] W S3 : water absorption of mixed quicklime, W S3 =m S ·α S3 ·β S 32.14%; where α S3 is the water absorption rate of quicklime, α S3 The value is 5-15%, and this implementation takes 10%; β S is the CaO content of quicklime, and the CaO content of the quicklime adopted this time is 78.88%, W S2 =0.91t / h;

[0119] W B3 : Water absorption of a mixed dolomite, W B3 =m B ·α B3 ·β B 32.14%; where α B3 is the water absorption rate of dolomite, α B3 Value is 5~8%, and the present embodi...

Embodiment 3

[0122] The basic content of this embodiment is the same as that of Embodiment 1, except that the raw material ratio and moisture content of this embodiment are as shown in Table 2. (1-1) Water absorption α of quicklime when first mixed S1 Calculated by the following formula:

[0123]

[0124] K S1 : Coefficient of water absorption of quicklime in a mixture, K S1 The value is 0.16~0.20; this embodiment takes 0.18

[0125] t 1 : Mixing time for one mixing, t 1 The range is 3~6min, and the present embodiment takes 5min

[0126] The percentage of quicklime particle size ≤ 3mm, The value is 92~95%, and the present embodiment is 92%;

[0127] h 1 : mix target moisture, the present embodiment gets 7.39%;

[0128] T 1 : temperature of a mixture, T 1 The range is between 40°C and 55°C, and 44°C is used in this embodiment;

[0129] m in this example s =40t / h, M 0 =798.50t / h;

[0130] Calculated to get α S1 = 54.99%;

[0131] Table 2 The cutting amount of each raw ...

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Abstract

The invention discloses an automatic control method for the water content of a sintering mixture and belongs to the technical field of sintering. The automatic control method includes the specific steps that S100, the water content of a mixture in the first mixing process is controlled, and a target water content H1 is firstly set; it is detected that the water content of the mixture after first mixing is H'1; and when |H'1-H1|>=0.1%, the water adding amount in the mixture sintering correcting process is W'1; and S200, the water content of the mixture in the second mixing process is controlled, and a target water content H2 is firstly set; it is detected that the water content of the mixture after second mixing is H'2; and when |H'2-H2|>=0.1%, the water adding amount in the mixture sintering correcting process is W'2. By adjusting the water adding amount W1 during first mixing and the water adding amount W2 during second mixing in the mixture sintering process, the total water adding amount W0 in the mixture sintering process is controlled. According to the automatic control method for the water content of the sintering mixture, the accuracy and objectivity of operation are improved, and the water distribution precision of the sintering mixture is improved.

Description

technical field [0001] The invention relates to the technical field of iron ore sintering, and more specifically relates to a method for automatically controlling the moisture content of a sintering mixture. Background technique [0002] Before the sintered material is mixed and granulated, its particle size is relatively fine. For example, the concentrate powder in the iron-containing raw material contains more than 60% of the 0-3mm particle size, and the flux and fuel have been crushed during the raw material preparation process, of which 0-3mm The content of the 3mm part is more than 80%, especially the <0.5mm powder accounts for about 40% of the total weight. Such fine-grained raw materials will seriously affect the air permeability of the sintered material layer during sintering, even when the draft sintering is carried out. It will be taken away by the air flow passing through the material layer, resulting in the loss of raw materials and seriously affecting the nor...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B1/16G16C20/10
Inventor 陈虎常春荣邓小龙杨雄文
Owner 山东诺德能源科技有限公司
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