Environment-friendly and low-carbon calcium carbide synthesis process

A synthesis process and calcium carbide technology, which is applied in the field of green and low-carbon calcium carbide synthesis process, can solve the problems of high carbon dioxide and emissions, and achieve the effects of improving the quality of calcium carbide, reducing CO2 emissions, and improving the effective utilization of resources.

Inactive Publication Date: 2019-01-04
SHANGHAI ADVANCED RES INST CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a green and low-carbon calcium carbide synthesis process, which mainly solves the problem of high carbon dioxide emissions in the calcium carbide synthesis process in the prior art

Method used

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  • Environment-friendly and low-carbon calcium carbide synthesis process
  • Environment-friendly and low-carbon calcium carbide synthesis process
  • Environment-friendly and low-carbon calcium carbide synthesis process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] The mixture of powdered metallurgical coke (see Table 1 for the composition analysis of metallurgical coke) and calcium carbonate (the mass content of calcium carbonate is greater than 99.0%) (the molar ratio of carbon to calcium is 4:1) is ultrafinely ground by an ultrafine pulverizer , take the mixed material with a particle size distribution of 50-100 μm and put it into a granulator, use water as a binder, and carry out wet granulation to obtain a round pellet with a size of 1-2 cm as a raw material. After exchanging heat with the tail gas from the high-temperature carbon removal process through the heat exchanger and drying, the raw material group is put into the middle temperature section of the two-stage electric furnace, and the vacuum system of the reaction furnace is opened to discharge the air in the reaction furnace. When the absolute pressure of the system is low After 500Pa, turn on the heating power supply to heat up to 1200°C and keep the temperature const...

Embodiment 2

[0035] Powdered metallurgical coke (see Table 1 for composition analysis of metallurgical coke) and calcite (calcium carbonate mass content 98.0%) mixture (molar ratio of carbon to calcium is 4:1) was ultrafinely ground by a superfine pulverizer, and then obtained The mixed material with a particle size distribution between 100 and 200 μm is put into a granulator, and water is used as a binder for wet granulation to obtain a round pellet with a size of 2-3 cm as a raw material group. The raw material group is passed through After the tail gas from the high-temperature decarbonization process is heat-exchanged and dried, it is put into the electric heating reaction furnace 1, furnace 2 and furnace 3 respectively, and the vacuum system of the reaction furnace 1, furnace 2 and furnace 3 is opened to discharge the air in the reaction furnace. When the absolute pressure of the system is lower than 500Pa, first turn on the heating power of the reaction furnace 1, raise the temperatur...

Embodiment 3

[0037] A mixture of powdered metallurgical coke (see Table 1 for the composition analysis of metallurgical coke) and calcium carbonate (the mass content of calcium carbonate is greater than 99.0%) (the molar ratio of carbon to calcium is 4:1) was granulated into balls by wet method, and the preparation method was the same as in the example 1. Firstly, after the raw material group is heat-exchanged and dried by the tail gas from the high-temperature decarbonization process, it is put into the microwave rotary hearth furnace through the distributor. The air in the reaction furnace, when the absolute pressure of the system is lower than 500Pa, turn on the microwave heater, adjust the microwave power in the middle temperature zone to 1200°C and keep the temperature constant for 30 minutes. After being discharged, it is sent to the high-temperature decarbonization process. The solid-phase product generated by the reaction is sent to the high-temperature zone through the transition ...

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Abstract

The invention discloses an environment-friendly and low-carbon calcium carbide synthesis process. In the process, limestone and calcite are directly used as a calcium source for synthesizing calcium carbide; limestone calcining and calcium carbide synthesis processes are coupled in one reaction furnace, so that a process of calcining the limestone in a lime kiln in the conventional calcium carbideproduction process is eliminated; meanwhile, in the process, CO2 and CaO which are generated by decomposing CaCO3 can further respectively serve as a gasifying agent and a catalyst for carbon, and part of the generated CO2 is locally converted into CO in real time; the high-temperature CO gas generated in a high-temperature region exchanges heat with the medium temperature section and a high-temperature carbon removal process in sequence, thus realizing recycling of waste heat of high-temperature exhaust gas and improving the overall heat efficiency; gas in a medium temperature stage reacts with a high-temperature solid phase product, so that apparent heat of gas and solid phase materials is recycled, and CO2 in the gas and non-reacted carbon in the high-temperature solid phase product are converted into a high-additional-value product CO.

Description

technical field [0001] The invention belongs to the technical field of calcium carbide production, and in particular relates to a green and low-carbon calcium carbide synthesis process. Background technique [0002] China is a country poor in oil and rich in coal. Coal is an important basic energy source and industrial raw material in our country. Calcium carbide is a major intermediate product of clean coal and a basic raw material in the organic synthesis chemical industry. It is widely used in the synthesis of benzene, rubber, and polychloride. Organic chemical products such as ethylene and polyacetylene can also be used for welding and cutting metal (oxyacetylene flame). [0003] The electrothermal method has been used in the production of calcium carbide in industry. First, the limestone (basic component is CaCO 3 ) is calcined in a lime kiln at 850-1000°C to form quicklime (CaO mass content >92%), and then the cooled quicklime is crushed and sieved, and then put in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/942
CPCC01B32/942Y02P20/10Y02P20/129
Inventor 姜标赵虹齐会杰黄伟光
Owner SHANGHAI ADVANCED RES INST CHINESE ACADEMY OF SCI
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