Method for producing calcium oxide at high temperature
A technology of calcium oxide and high temperature, applied in chemical instruments and methods, calcium/strontium/barium oxide/hydroxide, inorganic chemistry, etc., can solve the problems of difficult control of production process, reduction of product purity, large equipment volume, etc. Achieve the effect of fast heating speed, good heating effect and high purity
Active Publication Date: 2014-12-24
XIANGFU NEW BUILDING MATERIAL HUNAN
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Problems solved by technology
This production method requires a large volume of equipment, and it is easy to introduce secondary impurities, reducing the purity of the product
[0004] CN101244900A discloses a calcium oxide production method using high-purity marble as a raw material and using gas or solid fuel as a heat source, which reduces the introduction of new impurities to a certain extent and basically achieves clean production, but this production process is difficult to control. higher cost
Method used
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Experimental program
Comparison scheme
Effect test
Embodiment
[0018] This embodiment includes the following steps:
[0019] (1) Dry calcium sulfate at 380°C to a moisture content of 0.01wt%, and crush it into 800 mesh powder;
[0020] The calcium sulfate is calcium sulfate with a whiteness of 99.1% and a purity of 99.2% by weight;
[0021] (2) Mix the calcium sulfate powder obtained in step (1) with 800 mesh iron powder in a weight ratio of 1:1;
[0022] (3) Place the mixture obtained in step (2) in a closed and evacuable insulated container, the container is made of non-magnetic insulating material;
[0023] (4) Start the high-frequency electric heating device placed on the outer surface of the container and turn on the vacuum device of the container; heat the mixture in the insulated container to 1150°C and keep it warm for 40 minutes;
[0024] (5) After the pressure in the adiabatic container is stabilized, release the material, and separate the iron powder from it by the action of the directional magnetic field.
[0025] This embodiment has good...
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Abstract
The invention discloses a method for producing calcium oxide at high temperature. The method comprises the following steps of: (1) drying and grinding calcium sulfate; (2) mixing calcium sulfate powder with iron powder; (3) placing a mixture obtained in the step (2) in a closed insulating container which can be vacuumized, wherein the insulating container is made of a nonmagnetic insulating material; (4) starting a high-frequency electric heating device arranged at the outer surface of the container, starting a vacuumizing device in the insulating container, and heating the mixture in the insulating container to 800-1200 DEG C; and (5) discharging the materials and separating iron powder from the materials under the effect of an oriented magnetic field after the pressure in the insulating container is stable. By the adoption of the method disclosed by the invention, the heating speed is fast, the material is heated uniformly, the heating effect is good, no secondary impurities are introduced in the whole process, and the purity of calcium oxide is high.
Description
Technical field [0001] The invention relates to a method for producing calcium oxide, in particular to a method for producing calcium oxide using calcium sulfate as a raw material. Background technique [0002] Calcium oxide is widely used in pesticides, papermaking, food, petrochemicals, tanning, waste water purification, etc. It can be used in the manufacture of calcium carbide, soda ash, bleaching powder, as refractory materials, desiccants, soil conditioners, and calcium fertilizers; Analytical reagent, flux for manufacturing fluorescent powder; used in leather making and waste water purification; used as building material and metallurgical flux; it is the main raw material for making calcium hydroxide and various calcium compounds. [0003] The traditional calcium oxide production method mainly uses limestone as the raw material, and the calcination process adopts a shaft kiln. The limestone and solid fuel are mixed together or layered into the kiln for combustion. This produ...
Claims
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IPC IPC(8): C01F11/04C01B17/50
CPCY02P20/10
Inventor 刘立文刘珍如宁爱民宁勇宁江天刘勇鲁纪鸣
Owner XIANGFU NEW BUILDING MATERIAL HUNAN