Experimental Study on Heating Performance of Electric Heating Plate Prepared from Graphite Solid Waste
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摘要:
我国石墨消费量的不断增长导致石墨固废总量持续增加，其堆存在占用大量土地的同时，也会对环境造成破坏。为了帮助解决该问题，利用不同类型以及配比的石墨固废包括开采废石、球形石墨尾料等制备了电热板材，给电热板材原料的选择提供了新思路。通过实验得出了石墨固废制备电热板材发热性能随输入电压和石墨尾料掺量的变化规律，并验证了其长期工作的可靠性。实验结果表明，在输入电压大于24 V时，电热板材的发热性能较好；球形石墨尾料掺量越大，电热板材的输出功率越高；循环升温降温270次后，电热板材体积电阻率仍变化较小，可长期稳定使用。
Abstract:The continuous growth of graphite consumption in China has led to the continuous increase of the total amount of graphite solid waste, which will not only occupy space, but also cause damage to the environment. In order to help solve this problem, electric heating plates were prepared by using different forms and proportions of graphite solid waste, including mining waste rock and spherical graphite tailings, which provided a new idea for the selection of raw materials for electric heating plates. Through experiments, the variation law of heating performance of electric heating plates prepared by graphite solid waste with input voltage and graphite tailings content was preliminarily obtained, and the reliability of its long-term work was verified. The test results show that the heating performance of the electric heating plate is better when the input voltage is greater than 24 V. The higher the spherical graphite tailings are, the higher the output power of the electric heating plate is. After 270 cycles of heating, the volume resistivity of the heating plate still changed little, which shows that it can be used for a long time.
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表 1 破碎后石墨开采废石级配
Table 1. Grading of waste rock from graphite mining
粒级/mm +4.75 +2.36 +1.18 +0.6 +0.3 +0.15 +0.075 合计 累积筛余/% 3.36 55.47 75.37 82.35 86.50 91.65 96.31 100.00 
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表 3 球形石墨尾料化学成分的XRF分析结果/%
Table 3. XRF analysis results of spherical graphite tailings
SiO2 Al2O3 Fe2O3 SO3 MgO CaO K2O TiO2 CuO MnO PbO MoO3 固定碳 烧失量 1.89 0.65 0.64 0.55 0.27 0.15 0.13 0.01 0.006 0.005 0.004 0.004 94.35 95.69
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表 2 石墨开采废石化学成分的XRF分析结果/%
Table 2. XRF analysis results of graphite mining waste rocks
SiO2 Al2O3 Fe2O3 SO3 CaO K2O MgO Na2O TiO2 P2O5 64.18 12.35 3.96 3.30 3.00 2.76 2.52 1.05 0.48 0.18 CeO2 BaO V2O5 MnO ZrO2 SrO ZnO Rb2O Y2O3 烧失量 0.13 0.12 0.053 0.045 0.016 0.016 0.014 0.012 0.004 5.82
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