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Method for promoting carbonization of quicklime

A technology of quicklime and magnesium oxide, which is applied in the field of building materials, can solve problems such as waste and affecting performance, 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
  • Method for promoting carbonization of quicklime

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] 1) Weigh a certain amount of light magnesia into a beaker, add boiling water, and stir while heating on a magnetic heating stirrer. The heating temperature is 120° C., and the stirring time is 1 hour; then dry for later use;

[0029] 2) Mix calcium carbonate and magnesium carbonate according to the molar ratio CaCO 3 :MgCO 3 =1:0.3 Weigh and mix. Then, according to the ball-to-material ratio of 20:1, the mixed powder was ball-milled for 10 minutes, and then passed through a 500-mesh sieve for later use:

[0030] 3) According to the molar ratio of CaO:Mg(OH) 2 =1:0.2 Take by weighing quicklime and magnesium hydroxide (step 1 product), and take by weighing dolomite powder according to 1% of the total mass of quicklime and magnesium hydroxide powder, the mixed powder that quicklime, magnesium hydroxide and step 2 obtains in Mix well in the beaker;

[0031] 4) Add water according to 45% of the total mass of the powder in step 3, and stir evenly;

[0032] 6) Put the uni...

Embodiment 2

[0034] 1) Weigh a certain amount of light magnesia into a beaker, add boiling water, and stir while heating on a magnetic heating stirrer. The heating temperature is 120° C., and the stirring time is 1 hour; then dry for later use;

[0035] 2) Mix calcium carbonate and magnesium carbonate according to the molar ratio CaCO 3 :MgCO 3 =1:0.3 Weigh and mix. Then, according to the ball-to-material ratio of 20:1, the mixed powder was ball-milled for 60 minutes, and then passed through a 500-mesh sieve for subsequent use;

[0036] 3) According to the molar ratio of CaO:Mg(OH) 2 =1:0.2 Take by weighing quicklime and magnesium hydroxide (step 1 product), and take by weighing the mixed powder of step 2 according to 5% of the total mass of quicklime and magnesium hydroxide powder, the mixed powder that quicklime, magnesium hydroxide and step 2 obtain Mix well in a beaker;

[0037] 4) Add water according to 30% of the total powder mass in step 3, and stir evenly;

[0038] 5) Put the ...

Embodiment 3

[0040] 1) Weigh a certain amount of light magnesia into a beaker, add boiling water, and stir while heating on a magnetic heating stirrer. The heating temperature is 120° C., and the stirring time is 1 hour; then dry for later use;

[0041] 2) Mix calcium carbonate and magnesium carbonate according to the molar ratio CaCO 3 :MgCO 3 =1:0.5 Weigh and mix. Then, according to the ball-to-material ratio of 20:1, the mixed powder was ball-milled for 120 minutes, and then passed through a 500-mesh sieve for preparation;

[0042] 3) According to the molar ratio of CaO:Mg(OH) 2 =1:0.12 Take by weighing quicklime and magnesium hydroxide (step 1 product), and take by weighing step 2 mixed powder according to 1.7% of quicklime and magnesium hydroxide powder gross mass, the mixed powder that quicklime, magnesium hydroxide and step 2 obtain Mix well in a beaker;

[0043] 4) Add water according to 30% of the total mass of the mixed powder in step 3, and stir evenly;

[0044] 5) Put the ...

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Abstract

The invention relates to a method for promoting carbonization of quicklime. The method comprises the steps: (1) preparing magnesium hydroxide powder; (2) weighing calcium carbonate and magnesium carbonate at a certain molar ratio, performing mixing, then performing ball grinding on the mixed powder at a certain ball-to-material ratio, and performing sieving for later use; (3) weighing quicklime and magnesium hydroxide at a certain molar ratio, weighing the mixed powder obtained in the step (2) at an amount of 0.1-5% of the total mass of the quicklime and magnesium hydroxide powder, mixing thequicklime, the magnesium hydroxide and the mixed powder obtained in the step 2 uniformly in a beaker; (4) adding water at an amount of 20-45% of the total mass of the powder obtained in the step (3),and performing uniform stirring; and (5) putting the mixed powder together the beaker in a pressure reactor for carbonization and solidification, and performing curing in a reactor with CO2 curing gasso as to obtain the product with a carbonization degree higher than the unmodified quicklime after completion of curing. Through the method, the degree of carbonization 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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