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Process for calcining small-granularity dolomite of 20-40 millimeters

A calcination process and small particle size technology, which is applied in the field of dolomite calcination, can solve the problems that affect the smooth production, low calcination quality and efficiency, and unstable process, so as to prevent nodules, eliminate flames from the top of the furnace, and process stable effect

Active Publication Date: 2012-10-03
HENAN FENGBAO SPECIAL STEEL CO LTD ANYANG IRON & STEEL GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In the process of calcining 20mm-40mm small-sized dolomite, the main problems are: due to the limitation of the original site, how to ensure that the standard-sized and small-sized dolomite are evenly mixed before feeding; how to ensure that the large and small The particle size dolomite is evenly distributed; when the small particle size dolomite is calcined, there is a lot of dust, which is easy to form nodules, resulting in abnormal furnace conditions and unstable process; etc.
These problems lead to low calcining quality and efficiency in the process of calcining small-sized dolomite, which in turn affects the smooth progress of the entire production

Method used

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  • Process for calcining small-granularity dolomite of 20-40 millimeters
  • Process for calcining small-granularity dolomite of 20-40 millimeters

Examples

Experimental program
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Effect test

Embodiment 1

[0020] Present embodiment is that the dolomite child of 40 millimeters-80 millimeters particle size and the small particle size dolomite child of 20 millimeters-40 millimeters are mixed as example in the ratio of 2:1.

[0021] (1) mix 40mm-80mm particle size dolomite and 20mm-40mm small particle size dolomite in a ratio of 2:1, and deliver to furnace top charging bell through three vibrating sieves, the diameter of vibrating sieve is 8 mm, The dolomite stones of different particle sizes from top to bottom in the vertical direction in the furnace are stacked in the following ways: 40mm-80mm particle size, 20mm-40mm small particle size, 40mm-80mm particle size, The distance between the material surface in the furnace and the furnace mouth is controlled to be 500 mm;

[0022] (2) Preheating, the temperature of the preheating zone is controlled at 300°C;

[0023] (3) Calcining, the temperature of the calcining zone is controlled to be 1050°C, and the proportioning ratio of gas an...

Embodiment 2

[0027] In this embodiment, the dolomite with a particle size of 40mm-80mm and the dolomite with a small particle size of 20mm-40mm are mixed in a ratio of 4:1 as an example. The diameter of the furnace is 10 mm, and the distance between the material surface in the furnace and the furnace mouth is controlled to be 600 mm, the temperature of the preheating zone is controlled to be 300 °C, the temperature of the calcining zone is controlled to be 1000 °C, the temperature of the cooling zone is controlled to be 200 °C, and the ash discharge temperature is controlled to be 100 °C. ℃, the furnace top temperature is controlled at 120 ℃, the ratio of gas and air volume during calcination is controlled at 1:1.1, and the ash output per time is 5 tons. All the other are the same as in Example 1.

Embodiment 3

[0029] In this embodiment, the dolomite with a particle size of 40mm-80mm and the dolomite with a small particle size of 20mm-40mm are mixed in a ratio of 3:1 as an example, and are sent to the furnace top material bell through three vibrating screens, and the vibrating screen The diameter of the furnace is 11 mm, and the distance between the material surface in the furnace and the furnace mouth is controlled at 570 mm, the temperature of the preheating zone is controlled at 420 °C, the temperature of the calcining zone is controlled at 1030 °C, the temperature of the cooling zone is controlled at 270 °C, and the ash discharge temperature is controlled at 95 °C. ℃, the furnace top temperature is controlled at 130 ℃, the ratio of gas and air volume during calcination is controlled at 1:1.2, and the ash output per time is 5 tons. All the other are the same as in Example 1.

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Abstract

The invention provides a process for calcining small-granularity dolomite of 20-40 millimeters, belonging to the technical field of dolomite calcining. The process comprises the following steps of: (1) mixing materials in a furnace; (2) preheating; (3) calcining; (4) cooling; and (5) producing a finished product. The process is characterized in that dolomite of 40-80 millimeters and small-granularity dolomite of 20-40 millimeters are mixed according to a ratio of (2:1)-(4:1), wherein the distance between the material surface and the furnace mouth in the furnace is controlled to be 500-600 millimeters, the temperature of a preheating zone is controlled to be 300-500 DEG C, the temperature of a calcining zone is controlled to be 1,000-1,050 DEG C, the temperature of a cooling zone is controlled to be 200-300 DEG C, and the discharge ash temperature is controlled to be 90-100 DEG C. The calcining process is stable, reduces the raw material cost and the fuel gas usage, improves the calcining output and has obvious benefit.

Description

technical field [0001] The invention relates to a calcination process of dolomite with a particle size of 20 mm to 40 mm, which is an improvement on the calcination process of dolomite with a particle size of 40 mm to 80 mm in the prior art, and belongs to the technical field of dolomite calcination. Background technique [0002] In recent years, various iron-making and steel-making plants have added light-burned dolomite during sintering and converter slag making, resulting in tight supply of raw materials in dolomite quarries, and the price of standard dolomite with a particle size of 40mm-80mm remains high. Saving funds, developing new resources, and how to use small-sized dolomite instead of standard-sized dolomite on existing equipment and furnace models have become key issues for the iron and steel industry. [0003] During the process of calcining dolomite with a small particle size of 20mm-40mm, the main problems are: due to the limitation of the original site, how t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B2/10
Inventor 宋德生李通曲保全周德明
Owner HENAN FENGBAO SPECIAL STEEL CO LTD ANYANG IRON & STEEL GRP
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