焙烧温度与碳结构对钙碳球团抗压强度的影响

doi:10.19964/j.issn.1006-4990.2022-0645

Abstract

Abstract:

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.

Key words: calcium oxide, lean coal, calcium oxide-containing carbon pellets, calcination temperature, carbon structure, compressive strength

CLC Number:

TQ127.1

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.

Figures/Tables 12

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References 28

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工业分析
w（M_ad）	w（A_d）	w（V_d）	w（FC_d）
1.04	10.57	12.93	76.5
元素分析
w（C_d）	w（H_d）	w（O_d）	w（N_d）	w（S_d）
80.43	3.85	3.45	1.29	1.28

焙烧温度/℃	元素分析/%
焙烧温度/℃	w（C）	w（S）	w（H）	w（O）	w（N）
350	46.52	0.36	2.83	2.73	0.86
450	46.35	0.25	2.34	2.98	0.84
550	45.14	0.19	2.15	4.36	0.80
650	44.86	0.16	1.94	5.01	0.75
750	44.35	0.11	1.73	5.57	0.74

波段名称	波段位置/cm^-1	振动模式	波段类型
G	1 580	理想石墨晶格的E_2g对称伸缩振动	sp²
D₁	1 350	A_1g对称性石墨晶格振动	sp²
D₂	1 720	无序石墨晶格结构	sp²
D₃	1 450~1 540	芳香环的半圆形呼吸；无定形碳结构	sp²，sp³
D₄	1 200~1 350	芳基-烷基醚；对位芳烃	sp³

温度/℃	A_D1	A_D3	I_D1 /I_G	I_G /I_all
350	22 520	16 500	0.441 92	0.495 46
450	26 150	21 020	0.457 01	0.479 1
550	32 590	25 580	0.481 03	0.469 48
650	24 730	19 950	0.485 47	0.469 39
750	15 620	16 800	0.461 72	0.465 35

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Effect of calcination temperature and carbon structure on compressive strength of CaO-containing carbon pellets

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