Inorganic Chemicals Industry >
Effect of calcination temperature and carbon structure on compressive strength of CaO-containing carbon pellets
Received date: 2022-11-01
Online published: 2023-09-19
In the process of arc production of calcium carbide，the raw material should have a certain strength to ensure the smooth passage of the product carbon monoxide.In order to improve the compressive strength of calcium carbon pellets in the two-step method，calcium oxide-containing carbon pellets with diameter of 15 mm and mass of 2.5 g were pressed with evenly mixed calcium oxide and lean coal at a pressure of 8 MPa and a time of 1 min by an embedded prototype，and calcined at a temperature of 350~750 ℃.The influence of carbon structure on the compressive strength of calcium oxide-containing carbon pellets at different calcination temperatures was studied.The results showed that when the temperature was 350~＜550 ℃，the decomposition and de-polymerization of coal was occured，the relative number of carbon structures with semi-coke defects was increased，and the compressive strength was decreased with the increase of temperature.When the temperature was 550~＜650 ℃，the coal was solidified and contracted into semi-coke，resulting in an increase in compressive strength to a maximum of 59.9 kPa.When the temperature was 650~750 ℃，the polycondensation reaction of semi-coke was occured，and the defect structure was developed to order and graphitization was occured，resulting in the reduction of compressive strength.
LI Qiang , YOU Xiaomin , SHE Xuefeng , JIANG Zeyi , XUE Qingguo , WANG Jingsong . Effect of calcination temperature and carbon structure on compressive strength of CaO-containing carbon pellets[J]. Inorganic Chemicals Industry, 2023 , 55(9) : 43 -49 . DOI: 10.19964/j.issn.1006-4990.2022-0645
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