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Preparation method of high-purity calcium oxide

A calcium oxide, high-purity technology, applied in calcium/strontium/barium oxide/hydroxide, nanotechnology for materials and surface science, nanotechnology, etc., can solve production costs, high energy consumption, and product purity Low, poor dispersion and other problems, to achieve the effect of improving production efficiency, high purity, small particle size

Pending Publication Date: 2020-08-25
NANNING XIAYANG CHEM TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the disadvantages of existing calcium oxide production technology, such as high production cost and high energy consumption, low purity and poor dispersibility of the prepared product, the present invention provides a method for preparing high-purity calcium oxide

Method used

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  • Preparation method of high-purity calcium oxide

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Embodiment 1

[0023] A preparation method of high-purity calcium oxide, comprising the following steps:

[0024] (1) Crush the limestone into 1cm particles, then put it into the calcination furnace and calcine at 600°C for 40~60min to obtain quicklime, and cool it down to room temperature naturally;

[0025] (2) According to the gray-water ratio of 1g:6mL, mix quicklime with hot water at 80°C, stir and age for 24 hours, and then sieve through a 200-mesh sieve to prepare a calcium hydroxide suspension with a concentration of 1.3mol / L ;

[0026] (3) Put the calcium hydroxide solution in the reaction kettle, add 0.8% of its mass modifier, stir and react at 35°C and 140r / min for 60min, and then vacuum dry at 50°C to obtain calcium hydroxide solid ;

[0027] The mixed modifier is obtained by mixing sodium stearate and polyvinyl alcohol 124 according to a mass ratio of 1:0.3;

[0028] (4) Calcinate the obtained calcium hydroxide solid at 600°C for 1 hour, then cool it to room temperature, put ...

Embodiment 2

[0031] A preparation method of high-purity calcium oxide, comprising the following steps:

[0032] (1) Crush the limestone into 2cm particles, then put it into the calciner and calcinate at 800°C for 60 minutes to obtain quicklime, and cool it down to room temperature naturally;

[0033] (2) According to the gray-water ratio of 1g:8mL, mix quicklime with hot water at 80°C, stir and age for 24 hours, and then sieve through a 200-mesh sieve to prepare a calcium hydroxide suspension with a concentration of 1.3mol / L ;

[0034] (3) Put the calcium hydroxide solution in the reaction kettle, add 1.2% of its mass modifier, stir and react at 55°C and 210r / min for 120min, and then vacuum dry at 60°C to obtain calcium hydroxide solid ;

[0035] The mixed modifier is obtained by mixing sodium stearate and polyvinyl alcohol 124 according to a mass ratio of 1:0.5;

[0036] (4) Calcinate the obtained calcium hydroxide solid at 800°C for 3 hours, then cool it to room temperature, put it in...

Embodiment 3

[0039] A preparation method of high-purity calcium oxide, comprising the following steps:

[0040] (1) Crush the limestone into 2cm particles, then put it into the calciner and calcinate at 700°C for 50 minutes to obtain quicklime, and cool it down to room temperature naturally;

[0041] (2) According to the gray-water ratio of 1g:7mL, mix quicklime with hot water at 80°C, stir and age for 24 hours, and then sieve through a 200-mesh sieve to prepare a calcium hydroxide suspension with a concentration of 1.3mol / L ;

[0042] (3) Take the calcium hydroxide solution and place it in a reaction kettle, add a mixed modifier of 1% of its mass, stir and react at 45°C, 140~210r / min for 80min, and then dry it in vacuum at 55°C to obtain hydroxide calcium solids;

[0043] The mixed modifying agent is obtained by mixing sodium stearate and polyvinyl alcohol 124 according to a mass ratio of 1:0.4;

[0044] (4) Calcinate the obtained calcium hydroxide solid at 700°C for 2 hours, then cool...

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Abstract

The invention provides a preparation method of high-purity calcium oxide. Calcium hydroxide is produced by using raw materials with extremely high calcium oxide content, the dispersity of calcium ionsis improved by using stearic acid and polyvinyl alcohol 124, and the crystal form and the particle size of the calcium ions are controlled so that calcium hydroxide solids are high in fineness and good in dispersity, and finally, calcium oxide with high purity and good dispersity is prepared through high-temperature calcination. Calcium hydroxide with good dispersity can be better and more uniformly calcined at high temperature so that the production efficiency is improved, the yield of waste gas CO2 is reduced, and the cost of subsequent treatment is reduced. The method is simple in process,safe, environmentally friendly and high in production efficiency, and the prepared calcium oxide product is high in purity and good in dispersity.

Description

technical field [0001] The invention belongs to the technical field of calcium oxide preparation, in particular to a preparation method of high-purity calcium oxide. Background technique [0002] Calcium oxide is an inorganic compound, commonly known as quicklime, which can be used as a filler, analytical reagent, building material, decolorizer, etc. Usually, the method for preparing quicklime is direct calcination. The limestone is crushed and then calcined at a high temperature of 900~1200℃. Obtain finished product, but this method energy consumption is high, produces more carbon dioxide gas. [0003] Invention patent CN201911208399.1, a preparation method of fine calcium oxide, including rough stone treatment, adding dilute hydrochloric acid to generate calcium chloride solution, filtering to remove impurities, adding sodium carbonate to generate calcium carbonate, constant temperature drying, calcination, cooling, surface treatment, crushing, Grinding and other steps to...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F11/06C01F11/16B82Y30/00B82Y40/00
CPCC01F11/06C01F11/16B82Y30/00B82Y40/00C01P2004/62C01P2004/64C01P2006/12C01P2004/54C01P2004/10
Inventor 韦明
Owner NANNING XIAYANG CHEM TECH CO LTD
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