High-magnesium limestone calcining method and lime produced by same

A limestone and high-magnesium technology, applied in the field of metallurgy, can solve the problems of affecting the operating efficiency of the rotary kiln, the limestone is easy to burst, and the ringing of the rotary kiln, so as to reduce the consumption of coal powder and exhaust gas emissions, reduce the phenomenon of ringing, and strengthen the strength Effect

Active Publication Date: 2021-02-23
SHANXI TAIGANG STAINLESS STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The calcination performance of this high-magnesium limestone is different from that of conventional limestone. When calcined according to the conventional process, the limestone is easy to burst and produce powder, which deteriorates the kiln condition and easily causes the rotary kiln to form rings, which affects the operating efficiency of the rotary kiln.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] (1) The MgO content of limestone is 7.46%, and the CaO content is 44.26%.

[0044] (2) After the limestone is crushed and sieved, the 10-40mm limestone is sent into the preheating tank, and after preheating at 265°C, it is sprayed with water + air cooling after it comes out of the discharge port. The amount of water sprayed is 190kg / t- 石灰石 , The fan speed is 700r / min, so that the temperature of the limestone is quickly reduced to below 100°C.

[0045] (3) Bring the above materials into the preheater and preheat at 260-280°C, then send them to the rotary kiln for calcination: the calcination temperature is controlled at 1050°C, and the coal injection rate is controlled at 195kg / t. After the calcination is completed, it enters the cooler for cooling, and the finished lime is output.

[0046] After testing, the limestone burst rate is 14.5%, the lime drum powder rate is 18.4%, the lime hydration activity is 29.85%, and the pulverized coal consumption is 192kg / t.

Embodiment 2

[0048] (1) Limestone MgO content is 9.13%, CaO content is 43.86%

[0049](2) After the limestone is crushed and sieved, the 10-40mm limestone is sent into the preheating tank. After preheating at 270 ° C, it is sprayed with cold water + air cooling after it comes out of the discharge port. The amount of water sprayed is 195kg. / t- 石灰石 , The fan speed is 700r / min, so that the temperature of the limestone is quickly reduced to below 100°C.

[0050] (3) Bring the above materials into the preheater and preheat at 260-280°C, and then send them to the rotary kiln for calcination: the calcination temperature is controlled at 1030°C, and the coal injection rate is controlled at 190kg / t. After the calcination is completed, it enters the cooler for cooling, and the finished lime is output.

[0051] After testing, the limestone burst rate is 15.0%, the lime drum powder rate is 17.8%, the lime hydration activity is 29.33%, and the pulverized coal consumption is 191kg / t.

Embodiment 3

[0053] (1) Limestone MgO content is 10.81%, CaO content is 41.99%

[0054] (2) After the limestone is crushed and sieved, put the 10-40mm limestone into the preheating tank. After preheating at 275°C, it will be sprayed with cold water + air cooling after it comes out of the discharge port. The amount of water sprayed is 198kg. / t- 石灰石 , The fan speed is 700r / min, so that the temperature of the limestone is quickly reduced to below 100°C.

[0055] (3) Bring the above materials into the preheater and preheat at 260-280°C, then send them to the rotary kiln for calcination: the calcination temperature is controlled at 1000°C, and the coal injection rate is controlled at 185kg / t. After the calcination is completed, it enters the cooler for cooling, and the finished lime is output.

[0056] After testing, the limestone bursting rate is 14.88%, the lime drum dusting rate is 16.91%, the lime hydration activity is 30.68%, and the pulverized coal consumption is 187kg / t.

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Abstract

The invention belongs to the technical field of metallurgy, and particularly relates to a high-magnesium limestone calcining method and lime produced by the same. The high-magnesium limestone calcination method comprises the following steps: (1) preheating crushed and screened high-magnesium limestone, (2) carrying out water spraying and air cooling treatment on the preheated high-magnesium limestone, so that the temperature of the high-magnesium limestone is rapidly reduced to 100 DEG C or below, and (3) calcining the high-magnesium limestone pretreated in the step (2) to obtain lime. According to the method for calcining the high-magnesium limestone, the preheated high-magnesium limestone is subjected to cold water spraying and air cooling quenching temperature treatment, so that the organization structure of the limestone can be stabilized, the strength of the limestone is enhanced, and the situation that the kiln condition is deteriorated due to the fact that powder is generated inthe calcining process is avoided.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a method for calcining high-magnesium limestone and lime produced therefrom. Background technique [0002] Shanxi Province and Hebei Province are rich in high-magnesium limestone resources, whose MgO content usually reaches 7%-14%, and CaO content is 38%-46%. Most of these resources are distributed among the interlayers of low-magnesium limestone, and if they are utilized, the cost of lime production can be effectively reduced. The MgO in lime is a beneficial component for post-process sintering and steelmaking. The use of this high-magnesium lime in steelmaking and sintering can reduce the proportion of dolomite and help reduce the cost of flux. [0003] The calcination performance of this high-magnesium limestone is different from that of conventional limestone. When calcined according to the conventional process, the limestone is easy to burst and produce powde...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B2/10
CPCC04B2/10
Inventor 贺淑珍史永林李昊堃蔡湄夏
Owner SHANXI TAIGANG STAINLESS STEEL CO LTD
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