Technological method for improving strength of preheated pellets in grate-rotary kiln

A process method and rotary kiln technology, which is applied in the field of grate machine and rotary kiln, can solve problems such as easy ring formation, and achieve considerable technical and economic indicators and economic benefits

Inactive Publication Date: 2018-01-19
BAOTOU IRON & STEEL GRP
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  • Abstract
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Problems solved by technology

[0003] The biggest problem with the grate machine-rotary kiln process is that it is easy to form loops

Method used

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  • Technological method for improving strength of preheated pellets in grate-rotary kiln
  • Technological method for improving strength of preheated pellets in grate-rotary kiln
  • Technological method for improving strength of preheated pellets in grate-rotary kiln

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Embodiment

[0022] Starting from the actual production, this process method is fully applied to the 1.2 million tons of grate machine-rotary kiln pellet production process in the west area of ​​Baotou Steel. Compared with the process before adopting the process method, it mainly has the following effects. As shown in Table 1, different process systems are designed for orthogonal experiments. Lower chain grate - rotary kiln preheating ball strength.

[0023] Table 1 The quality of the preheating ball in different process systems of the chain grate

[0024]

[0025]

[0026] Note: The temperature of the first stage of drying is 230°C. When the machine speed is 2.4m / min, 2m / min, and 1.5m / min, the preheating time of the first stage is 2.5min, 3min, and 4min.

[0027] The best process conditions can be obtained through the orthogonal experiment range and variance analysis: the temperature of the second stage of drying is 360°C, and the time is 6 minutes; the temperature of the first stag...

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Abstract

The invention discloses a technological method for improving the strength of preheated pellets in a grate-rotary kiln. In iron concentrates, the content of the iron concentrates with the grain size being -200 meshes is 80% or above, and the iron concentrates with the grain size being -325 meshes is 60%-80%; the specific surface area of the iron concentrates reaches 1500-1900 cm<2>/g or above; thegrain composition of raw materials stabilizes at no more than 0.074 mm, and the fluctuation range is no more than +/-1.5%; and the moisture content of crude pellet is 7.5%-8.0%. The grate-rotary kilnhas the technological parameters that the drying second-stage temperature is 355-365 DEG C; the preheating first-stage temperature is 570-580 DEG C; the preheating second-stage temperature is 990-1010DEG C; and the machine speed is 1.5-2.5 m/min. According to the technological method, the raw materials, the pelletizing technological parameters and the technological parameters of the grate-rotarykiln are controlled, by optimizing the technological conditions, the strength of the preheated pellets in the grate-rotary kiln can be improved, the strength of finished pellets can also meet the blast-furnace smelting requirement, and the economic benefits are considerable.

Description

technical field [0001] The invention relates to the technical field of the grate machine-rotary kiln, in particular to a process method for improving the strength of the grate machine-rotary kiln preheating ball. Background technique [0002] Grate machine-rotary kiln is more suitable for the national conditions of my country's pellet plant construction because of the following characteristics: (1) large production capacity and uniform product quality; (2) coal can be used as basic fuel; (3) adaptation to fluctuations in the properties of raw materials (4) The price of the high-temperature-resistant material of the chain grate is relatively low, which can be solved domestically. Therefore, in recent years, the grate machine-rotary kiln pellet technology has been developed rapidly in our country. [0003] The biggest problem with the grate-rotary kiln process is that it is easy to form loops. At present, the severe ringing of the rotary kiln has become the primary problem re...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/24C22B1/20C22B1/216
Inventor 张国成邬虎林刘周利白晓光张利高向洲
Owner BAOTOU IRON & STEEL GRP
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