Method of utilizing microwave energy to prepare calcium carbide at low temperature

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: 2016-03-30
SHANGHAI ADVANCED RES INST CHINESE ACADEMY OF SCI
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  • 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

Method used

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  • Method of utilizing microwave energy to prepare calcium carbide at low temperature
  • Method of utilizing microwave energy to prepare calcium carbide at low temperature

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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 of utilizing microwave energy to prepare calcium carbide at low temperature. The method comprises the following steps of using coal as a carbon source, using limestone or lime as a calcium source, heating by the microwave energy, and reacting and synthesizing to form the calcium carbide, wherein the reaction temperature of the synthesized calcium carbide is 1300-2000 DEG C, the reaction pressure is 0.3-1.1atm, and the reaction time is 3-120min; primarily grinding the carbon source and the calcium source, mixing according to a ratio, and performing ultrafine treatment to obtain an ultrafine mixed material; heating to react and synthesizing to form the calcium carbide by utilizing the microwave energy. The method has the advantages that the coal and the limestone are directly used as the raw materials, are subjected to ultrafine crushing, and are heated and synthesized to form the calcium carbide by the microwave energy; by utilizing various coal types, two steps of the coking of raw coal and the high-temperature decomposing of the calcium carbonate to prepare the limestone are not needed, the synthesizing temperature of the calcium carbide is lowered, the production efficiency and mechanical degree of the calcium carbide are improved, and a byproduct of carbon monoxide can be used as a chemical raw material to produce other 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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IPC IPC(8): C01B31/32C01B32/942
Inventor 姜标赵虹
Owner SHANGHAI ADVANCED RES INST CHINESE ACADEMY OF SCI
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