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Production method of low-carbon high-activity lime

A production method and high-activity technology, which is applied in the field of lime production and preparation, can solve problems such as difficulty in meeting requirements, and achieve the effects of improving quality, improving activity, and simple process

Inactive Publication Date: 2018-08-24
广西华洋矿源材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, active lime produced by traditional methods is difficult to meet the requirements when producing high-grade silicon steel, ultra-low carbon steel and other types of steel.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] A method for producing low-carbon high-activity lime, comprising the steps of:

[0030] S1. Pretreatment: The limestone raw material is cleaned, impurity removed, dried, crushed, and graded to obtain limestone powder with a particle size of 20-30 mm, and salt water is evenly sprayed on the surface of the limestone powder. The brine is saturated saline, and the quality of spraying the saturated brine accounts for 2% of the mass of the limestone powder.

[0031] In the limestone powder, the proportion of particle diameters greater than 30mm is less than 5%, the proportion of particle diameters less than 20mm is less than 5%, and the proportion of particle diameters less than 10mm is less than 1%. The chemical composition of the limestone raw material: CaO>53%, SiO 2 <1%.

[0032] S2. Preheating treatment: Preheat the limestone powder after spraying salt water, use a suspension preheater to preheat the limestone powder, first preheat the suspension preheater for 25 minut...

Embodiment 2

[0038] A method for producing low-carbon high-activity lime, comprising the steps of:

[0039] In step S3 calcination treatment, the preheated limestone powder is vacuum calcined, the calcination temperature is 1200° C., the pressure in the vacuum chamber is 2600 Pa, and other steps are the same as in Example 1.

Embodiment 3

[0041] A method for producing low-carbon high-activity lime, comprising the steps of:

[0042] In step S3 calcination process, vacuum calcine the preheated limestone powder, the calcination temperature is 1200° C., the pressure in the vacuum chamber is 2800 Pa, and other steps are the same as in Example 1.

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Abstract

The invention provides a production method of low-carbon high-activity lime and relates to the field of preparation and production of lime. The method particularly includes steps of pretreatment, preheating, calcination and cooling. The refining method is carried out through steps of normal pressure preheating, vacuum calcination and normal pressure cooling by controlling the component and granular size of the raw materials and calcination temperature and fuel in the reaction process. The method increases activity of the active lime and reduces carbon and sulfur content, and improves quality of the active lime.

Description

technical field [0001] The invention relates to the field of lime production and preparation, in particular to a production method of low-carbon high-activity lime. Background technique [0002] Lime (quick lime) is obtained by calcining limestone, chalk, shells, etc., and has a wide range of applications in metallurgy, construction, chemical industry, environment, agriculture and other fields. Lime is white block or powder, with low hardness, Mohs hardness between 2-3, according to its reactivity, it can be divided into four categories: activated lime, lightly burned lime, moderately burned lime, and overburned lime. Activated lime is a kind of light burnt lime with good quality. It has the advantages of high porosity, large specific surface area, good reactivity, low impurities, uniform particle size and certain strength. The activity of activated lime is generally above 300ml ( 4mol / L HCl, 40±1°C, 10min hydrochloric acid titration value). CaO content and activity are im...

Claims

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Application Information

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IPC IPC(8): C04B2/10C04B2/04
CPCC04B2/04C04B2/10
Inventor 李文康张宸宇欧西江
Owner 广西华洋矿源材料有限公司
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