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A method for preparing calcium carbide at low temperature using microwave energy

A technology of microwave energy and calcium carbide, applied in the direction of carbide, calcium carbide, etc., can solve the problems of high energy consumption, high investment, high pollution, etc., and achieve the effects of short process, low cost and low reaction temperature

Active Publication Date: 2017-10-13
SHANGHAI ADVANCED RES INST CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to provide a method for preparing calcium carbide at low temperature using microwave energy, so as to solve the technical problems of "high investment, high energy consumption, and high pollution" in the traditional calcium carbide production technology in the prior art

Method used

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  • A method for preparing calcium carbide at low temperature using microwave energy
  • A method for preparing calcium carbide at low temperature using microwave energy

Examples

Experimental program
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Effect test

Embodiment 1

[0025] Fujian anthracite (see Table 1 for the composition of anthracite) and limestone (mass content of calcium carbonate greater than 98%) with a particle size of 0.5-5mm after initial grinding were mixed according to the molar ratio of C:Ca=4:1 and then ultra-finely ground to obtain The superfine mixed material whose particle size is less than 40μm accounts for more than 90%. Press it into a disc with a diameter of 5 cm and a thickness of 1 cm under a hydraulic press with a pressure of 50 MPa. Each piece weighs about 20g. The above 3 pieces of mixed raw materials were placed in the crucible of the microwave reactor, and the microwave power was adjusted so that the reaction temperature rose from room temperature to 1700°C within 45mins and kept at 1700°C for 30min. After the reaction was completed, the temperature was lowered to 400° C., and the material was taken out. The surface of the material is gray-black, and the whole shrinks and agglomerates, which is the obtained c...

Embodiment 2

[0030] The molar ratio of C:Ca=4:1 in Example 1 was used for direct reaction. Weigh 60.0 g of the above powder and place it in the crucible of a microwave reactor, adjust the microwave power to increase the reaction temperature from room temperature to 1700 °C within 45 mins and keep it at 1700 °C for 30 min. After the reaction was completed, the temperature was lowered to 400° C., and the material was taken out. The surface of the material is off-white, the interior is gray-black, crisp and loose without sintering, which is the obtained calcium carbide product. The product was detected by gas evolution, and its gas evolution capacity reached 277L / Kg.

Embodiment 3

[0032] The molar ratio of C:Ca=4:1 in Example 1 was used for direct reaction. Weigh 60.0 g of the above powder and place it in the crucible of a microwave reactor, adjust the microwave power to increase the reaction temperature from room temperature to 1400 °C within 30 mins and keep it at 1400 °C for 20 min. After the reaction was completed, the temperature was lowered to 400° C., and the material was taken out. The surface of the material is gray-black, the inside is black, crisp and loose without sintering, which is the obtained calcium carbide product. The product was detected by gas evolution, and its gas evolution capacity reached 129L / Kg.

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Abstract

The invention discloses a method for preparing calcium carbide at low temperature by using microwave energy. The method is as follows: using coal as a carbon source, limestone or lime as a calcium source, and reacting to synthesize calcium carbide under microwave heating; wherein the reaction temperature for synthesizing calcium carbide is 1300-2000 °C, the reaction pressure is 0.3-1.1 atm, and the reaction time is 3 ~ 120min. The carbon source and the calcium source are initially ground and mixed in proportion, and then superfine to obtain a superfine mixed material, and then microwave energy is used to heat and react to synthesize calcium carbide. The present invention directly adopts coal and limestone as raw materials and synthesizes calcium carbide under microwave energy heating after superfine pulverization. This technology uses various types of coal, which can save the two links of making coke from raw coal and pyrolysis of calcium carbonate to make quicklime, reduce the temperature of calcium carbide formation, improve the production efficiency and mechanization of calcium carbide, and at the same time, the by-product carbon monoxide can be used as chemical raw materials to produce other products. Chemical Products.

Description

technical field [0001] The invention relates to the technical field of calcium carbide preparation, in particular to a method for preparing calcium carbide at low temperature using microwave energy. Background technique [0002] Calcium carbide, commonly known as calcium carbide, is produced by high-temperature reaction of coke (C) and lime (CaO). It is an important intermediate product of coal chemical industry and a key compound for the production of pure chemicals from coal except methanol. The current industrial calcium carbide production technology was invented in 1892. It is the reaction of calcium oxide and coke at high temperatures (above 2000°C) generated by the arc to generate molten calcium carbide (CaC 2 ). Although the electrothermal method has a long history, it still has the disadvantages of high energy consumption and high pollution. Calcium carbide synthesis reaction is a solid-phase endothermic reaction, the mass transfer and heat transfer efficiency of r...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B32/942
Inventor 姜标赵虹
Owner SHANGHAI ADVANCED RES INST CHINESE ACADEMY OF SCI
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