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Production method of active metallurgical lime

A production method and lime technology, applied in the direction of magnesium oxide, etc., can solve the problems of active metallurgical lime carbon, low sulfur impurity content, high sulfur impurity content, and not easy to absorb moisture and deteriorate, so as to reduce sulfur impurity content, high separation efficiency, The effect of not easy to absorb moisture and deteriorate

Active Publication Date: 2014-06-04
ZHEJIANG JIANDE HONGXING CALCIUM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problems of active metallurgical lime carbon produced in the prior art, high content of sulfur impurities, easy to absorb moisture and deteriorate, and high production cost. A low-cost active metallurgical lime production process, the active metallurgical lime produced by it has low content of carbon and sulfur impurities, and is not easy to absorb moisture and deteriorate

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] (1) Wash the limestone raw material with water to remove impurities, dry it, and then crush it to obtain limestone powder with a particle size of 1~3mm;

[0020] (2) Mix 1000kg of limestone powder and 2kg of potassium oxalate evenly to obtain a mixture of limestone powder and potassium oxalate;

[0021] (3) Preheat the mixture of 1002kg limestone powder and potassium oxalate to 600°C;

[0022] (4) Send the preheated mixture of limestone powder and potassium oxalate and coke oven gas fuel with molecular sieve adsorption pretreatment and sulfur content ≤ 500mg / Nm3 into the fluidized kiln for calcination. The fluidized kiln has a diameter of 1000mm and a height of The ratio is 10:1, the ratio of the mass flow rate of the mixture of limestone powder and combustion accelerant to the volume flow rate of coke oven gas is 1:0.3, and the semi-finished active metallurgical lime is obtained by calcining at a calcination temperature of 950°C for 30 seconds;

[0023] (5) The semi-f...

Embodiment 2

[0025] (1) Wash the limestone raw material with water to remove impurities, dry it, and then crush it to obtain limestone powder with a particle size of 1~3mm;

[0026] (2) Mix 1000kg of limestone powder and 5kg of potassium acetate evenly to obtain a mixture of limestone powder and potassium acetate;

[0027] (3) Preheat the mixture of limestone powder and potassium acetate to 550°C;

[0028] (4) The mixture of preheated limestone powder and potassium acetate and coke oven gas fuel with sulfur content ≤ 500mg / Nm3 after molecular sieve adsorption pretreatment are sent into the fluidized kiln for calcination. The diameter of the fluidized kiln is 1000mm, and the height The ratio is 10:1, the ratio of the mass flow rate of the mixture of limestone powder and combustion accelerant to the volume flow rate of coke oven gas is 1:0.1, and the semi-finished active metallurgical lime is obtained by calcining at a calcination temperature of 900°C for 60 seconds;

[0029] (5) The semi-f...

Embodiment 3

[0031] (1) Wash the limestone raw material with water to remove impurities, dry it, and then crush it to obtain limestone powder with a particle size of 2mm;

[0032] (2) Mix 1000kg of limestone powder, 1.5kg of potassium citrate and 1.5kg of potassium oxalate evenly to obtain a mixture of limestone powder, potassium citrate and potassium oxalate;

[0033] (3) Preheat the mixture of limestone powder, potassium citrate and potassium oxalate to 575°C;

[0034] (4) Put the mixture of preheated limestone powder, potassium citrate and potassium oxalate and coke oven gas fuel with molecular sieve adsorption pretreatment and sulfur content ≤ 500mg / Nm3 into the fluidized kiln for calcination. The diameter of the fluidized kiln is 1000mm, the ratio of height to diameter is 10:1, the ratio of the mass flow rate of the mixture of limestone powder and combustion accelerant to the volume flow rate of coke oven gas is 1:0.2, and calcined at 925°C for 45 seconds to obtain semi-finished activ...

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Abstract

The invention relates to a production method of lime, especially relates to a production method of active metallurgical lime, and aims to solve the problem that the active metallurgical lime produced by the existing technology is high in content of sulfur and carbon impurities, easily absorbs moisture and goes bad, and is high in production cost. The production method of active metallurgical lime comprises the following steps of: (1) purifying and crashing the lime stone raw material; (2) mixing the lime stone raw material with the combustion improver to prepare the mixture of the lime stone powder and the combustion improver; (3) preheating the mixture of the lime stone powder and the combustion improver; (4) with the coke oven gas as fuel, roasting the mixture of the lime stone powder and the combustion improver in a boiling kiln; (5) separating by a cyclone separator, and cooling to get the active metallurgical lime product. With the production method of active metallurgical lime provided by the invention, the produced active metallurgical lime is low in content of sulfur and carbon impurities, not easy to absorb moisture and go bad, and low in production cost.

Description

technical field [0001] The invention relates to a production method of lime, in particular to a production method of active metallurgical lime. Background technique [0002] Active metallurgical lime is used as slagging and desulfurization agent for molten iron pretreatment, molten steel refining furnace, oxygen top-blown converter, top-bottom double-blown converter and electric arc steel refining furnace. quality is important. In the smelting process of phase-free silicon steel, the desulfurizer used requires low sulfur and low carbon, generally the sulfur content should be less than 0.02%, and the carbon content should be less than 0.15%. At present, my country's traditional production of active metallurgical lime is mainly shaft kiln and rotary kiln, the highest activity of the produced active metallurgical lime is about 400ml, the highest content of calcium oxide is 92.0%, the content of carbon, sulfur and other impurities is high, and extremely Easy to absorb moisture ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F5/06
Inventor 周建红
Owner ZHEJIANG JIANDE HONGXING CALCIUM
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