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High-calcium active lime

A technology of active lime and high calcium, which is applied in the field of materials, can solve the problems of processing and unspecified limestone grade, etc., and achieve the effect of expanding the application range and reducing the impurities of active lime

Active Publication Date: 2020-04-10
GUIZHOU ANKAIDA IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

First of all, this process does not specify the grade of limestone used. We know that the components of limestone produced by different mineral sources are quite different. This process is mainly aimed at the removal of C and S impurities. , and the harmful impurities contained in limestone are mainly SiO 2 , Fe 2 o 3 etc. These main impurities are not treated in this process

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] 1. Select SiO2 2 , Fe 2 o 3 For low-grade limestone with a total content of more than 3%, use a magnet to remove iron debris in the limestone, soak in sodium hydroxide solution for 6 hours, wash and dry to obtain pretreated limestone;

[0020] 2. Preparation of dispersant: use ethanol as solvent, add monoethanolamine with a mass of 4% of the solvent and sodium ethylenediamine tetramethylene phosphate with a mass of 15%;

[0021] 3. Break the pretreated limestone into particles with a particle size of 50mm, add a dispersant to the limestone particles, and irradiate with ultraviolet light with a wavelength of 235nm while stirring for 1.5 hours;

[0022] 4. Make a suspension of calcium hydroxide and water at a volume ratio of 1:2.5, that is, a complexing agent. Add the complexing agent to the limestone particles, and continue heating to 220 ° C. At the same time, supplemented by an electric field, the voltage value is 3000V, wash with nitric acid solution, then treat wi...

Embodiment 2

[0028] 1. Select SiO2 2 , Fe 2 o 3 For low-grade limestone with a total content of more than 3%, use a magnet to remove iron debris in the limestone, then soak in potassium hydroxide solution for 8 hours, then wash and dry to obtain pretreated limestone;

[0029] 2. Preparation of dispersant: using ethanol as a solvent, adding 5% of diethanolamine by solvent mass and 17% of diethylenetriaminepentamethylene phosphate by solvent mass;

[0030] 3. Break the pretreated limestone into granules with a particle size of 60 mm, add a dispersant to the limestone granules, and irradiate ultraviolet light with a wavelength of 280 nm while stirring for 1 hour;

[0031]4. Make a suspension of calcium hydroxide and water at a volume ratio of 1.2:2, that is, a complexing agent. Add the complexing agent to the limestone particles, and continue heating to 240 ° C. At the same time, supplemented by an electric field, the voltage value is 3200V, wash with hydrochloric acid solution, then add s...

Embodiment 3

[0037] 1. Select SiO2 2 , Fe 2 o 3 For low-grade limestone with a total content of more than 3%, use a magnet to remove iron debris in the limestone, then soak in potassium hydroxide solution for 4 hours, then wash and dry to obtain pretreated limestone;

[0038] 2. Preparation of dispersant: using ethanol as a solvent, adding 3% triethanolamine by solvent mass and 12% amine trimethylene phosphate by solvent mass;

[0039] 3. Break the pretreated limestone into granules with a particle size of 40 mm, add a dispersant to the limestone granules, and irradiate ultraviolet light with a wavelength of 190 nm while stirring for 1.5 hours;

[0040] 4. Make a suspension of calcium hydroxide and water at a volume ratio of 1:3, that is, a complexing agent. Add the complexing agent to the limestone particles, and continue heating to 200 ° C. At the same time, supplemented by an electric field, the voltage value is 2800V, wash with strong acid solution, and then add sodium alginate afte...

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Abstract

The invention belongs to the field of materials, and particularly relates to high-calcium active lime. A preparation method comprises the steps of pretreatment, activation, impurity removal and the like. According to the method, low-grade limestone with the total content of SiO2 and Fe2O3 being greater than 3% is utilized; the calcium content of the active lime produced by the process disclosed bythe invention reaches 97.3%, the carbon content is lower than 0.5%, the sulfur content is lower than 0.02%, the SiO2 content is lower than 1.0%, and the Fe2O3 content is lower than 1.0%, the producedactive lime has few impurities and can reach the standards of various fields, and the application range is expanded.

Description

technical field [0001] The invention belongs to the field of materials, and in particular relates to a high-calcium active lime. Background technique [0002] Activated lime, namely quicklime, is obtained by calcining limestone, shells, etc. It is a kind of light burnt lime of good quality. It has high porosity, large specific surface area, low bulk density and less impurities. It is widely used in construction, chemical industry and environment. and other fields. However, due to the different requirements for calcium oxide, carbon and sulfur content of active lime in various fields, the production line of active lime is relatively single, and the active lime that can be used to make architectural coatings cannot be used for refining because the carbon content does not meet the standard. Steel makes the same production of active lime, but it cannot be applied to various fields at the same time, which limits the application range of active lime. [0003] In the traditional ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B2/10C21C7/076
CPCC04B2/104C21C7/076Y02P10/20
Inventor 张龙梁远鹏钟红莉吴义德袁图忠张文栋胡品斌顾华辛建王勇
Owner GUIZHOU ANKAIDA IND
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