Method for promoting carbonization of quicklime by taking calcium carbonate as template agent

A technology of calcium carbonate and quicklime, which is applied in the field of building materials, can solve problems affecting performance and waste, and achieve the effects of improving utilization rate, increasing carbonization degree, and increasing reaction area

Inactive Publication Date: 2019-09-13
HUBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Therefore, the degree of carbonization of calcium hydroxide directly affects its range of use and effect, but in many practical applications, the degree of carbonization of calcium hydroxide is not high, only half of the theoretical value, which not only seriously affects its performance, but also has an output of hundreds of millions of tons. For the unit context, is a huge waste

Method used

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  • Method for promoting carbonization of quicklime by taking calcium carbonate as template agent
  • Method for promoting carbonization of quicklime by taking calcium carbonate as template agent

Examples

Experimental program
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Effect test

Embodiment 1

[0027] 1) Put the calcium carbonate into a ball mill according to the ball-to-material ratio of 20:1 for ball milling for 10 minutes, then grind it with a mortar, and pass through a 500-mesh sieve for subsequent use;

[0028] 2) Weigh the calcium carbonate obtained in step 1 according to 0.3% of the quicklime mass, and mix the quicklime and calcium carbonate in a beaker evenly;

[0029] 3) add water according to 50% of the total mass of quicklime and calcium carbonate, and stir evenly;

[0030] 4) Put the uniformly stirred powder together with the beaker into the reaction kettle for curing, the curing pressure is 0.05MPa, and the curing time is 2h; after curing, a product with an increased degree of carbonization than unmodified quicklime is obtained.

Embodiment 2

[0032] 1) Put the calcium carbonate into a ball mill according to the ball-to-material ratio of 20:1 for ball milling for 120 minutes, then grind it with a mortar, and pass through a 500-mesh sieve for subsequent use;

[0033] 2) Weigh the calcium carbonate obtained in step 1 according to 1.7% of the quicklime mass, and mix the quicklime and calcium carbonate in a beaker;

[0034] 3) add water according to 35% of the total mass of quicklime and calcium carbonate, and stir evenly;

[0035] 4) Put the uniformly stirred powder together with the beaker into the reaction kettle for curing, the curing pressure is 0.3MPa, and the curing time is 2h; after curing, a product with an increased degree of carbonization than unmodified quicklime is obtained.

Embodiment 3

[0037] 1) Put the calcium carbonate into a ball mill according to the ball-to-material ratio of 20:1 for ball milling for 80 minutes, then grind with a mortar, and pass through a 500-mesh sieve for subsequent use;

[0038] 2) Weigh the calcium carbonate obtained in step 1 according to 2.5% of the quicklime mass, and mix the quicklime and calcium carbonate in a beaker;

[0039] 3) add water according to 30% of the total mass of quicklime and calcium carbonate, and stir evenly;

[0040] 4) Put the uniformly stirred powder together with the beaker into the reaction kettle for curing, the curing pressure is 0.05MPa, and the curing time is 2h; after curing, a product with an increased degree of carbonization than unmodified quicklime is obtained.

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Abstract

The invention relates to a method for promoting carbonization of quicklime by taking calcium carbonate as a template agent. The method comprises the following steps: (1) putting calcium carbonate intoa ball mill according to a certain ball-material ratio to carry out ball milling, then carrying out grinding by using a mortar, and carrying out sieving for later use; (2) weighing calcium carbonateaccording to 0.3%-3% of the mass of quicklime, and uniformly mixing the quicklime and the calcium carbonate in a beaker; (3) adding water accounting for 25%-50% of the total mass of the quicklime andthe calcium carbonate, and uniformly carrying out stirring; (4) putting the uniformly stirred powder and the beaker into a pressure reaction kettle together for carbonization and solidification, and carrying out curing in the reaction kettle, wherein the curing gas is CO2, the pressure range is 0.05-0.9 MPa, and the curing time is 2 hours, so that a product with a carbonization degree higher thanthe carbonization degree of unmodified quicklime is obtained after curing is finished. The ground calcium carbonate exerts a template induction function in the carbonization process and promotes carbonization. According to the method, the carbonization degree of quicklime can be improved.

Description

technical field [0001] The invention belongs to the field of building materials and relates to a modification method for increasing the carbonization degree of quicklime. Background technique [0002] Quicklime is calcium oxide. Due to its advantages of wide sources, low cost and excellent chemical applicability, it has been widely used in daily life; calcium hydroxide can be seen everywhere in the fields of construction, clinical medicine, food, sewage treatment and so on. figure. my country's lime industry is developing rapidly, with an output of about 280 million tons in 2017, accounting for 70% of the world's total. Among the many uses, the construction industry is the most demanding; the construction industry uses quicklime and water to react to produce slaked lime (calcium hydroxide), and slaked lime can react with carbon dioxide to form calcium carbonate to harden and meet the use requirements. [0003] Therefore, the degree of carbonization of calcium hydroxide dir...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/10
CPCC04B28/10C04B22/10C04B22/066
Inventor 陈艳林刘浩彭航肖媛郭炜丁朋娄浪黄康
Owner HUBEI UNIV OF TECH
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