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<p>Polyvinyl chloride (PVC) and waste tires are common waste pollutants and cannot be directly used as injection fuel in blast furnace (BF) due to harmful elements. PVC and waste tire pyrolysis carbon black (CB) were processed here by using an advanced hydrothermal carbonization (HTC) method to remove harmful elements, and the hydrochar for injection was also explored. Results showed that HTC had a significant dechlorination effect, and the chlorine content in PVC decreased by 44.16 pct. Meanwhile, the sulfur in CB also decreased by 0.13 pct. Compared with CB, the calorific value of PVC improved more after HTC, increasing by 75.86 pct. The dechlorination and dezincification effects of co-HTC are more efficient than those of hydrothermal alone. The particle size distribution of co-HTC hydrochar is more concentrated, with a more developed pore structure, the carbon order is close to that of anthracite and has good metallurgical properties. Kinetic results show that with the increase of the addition ratio of co-HTC hydrochar, the average reaction rate of the mixed fuel with the lowest activation energy is the highest at 40 pct. Thus, the hydrochar that meets the requirements of BF injection can be prepared by co-HTC of PVC and CB.</p> Graphical Abstract <p></p>

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Preparation of Blast Furnace Injection Fuel by Co-hydrothermal Carbonization of Polyvinyl Chloride and Pyrolytic Carbon Black

  • 期刊论文

  • 发表日期：

    2025年5月16日

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  • Nan Zhang,
  • Xiaojun Ning,
  • Guangwei Wang

摘要

Polyvinyl chloride (PVC) and waste tires are common waste pollutants and cannot be directly used as injection fuel in blast furnace (BF) due to harmful elements. PVC and waste tire pyrolysis carbon black (CB) were processed here by using an advanced hydrothermal carbonization (HTC) method to remove harmful elements, and the hydrochar for injection was also explored. Results showed that HTC had a significant dechlorination effect, and the chlorine content in PVC decreased by 44.16 pct. Meanwhile, the sulfur in CB also decreased by 0.13 pct. Compared with CB, the calorific value of PVC improved more after HTC, increasing by 75.86 pct. The dechlorination and dezincification effects of co-HTC are more efficient than those of hydrothermal alone. The particle size distribution of co-HTC hydrochar is more concentrated, with a more developed pore structure, the carbon order is close to that of anthracite and has good metallurgical properties. Kinetic results show that with the increase of the addition ratio of co-HTC hydrochar, the average reaction rate of the mixed fuel with the lowest activation energy is the highest at 40 pct. Thus, the hydrochar that meets the requirements of BF injection can be prepared by co-HTC of PVC and CB.

Graphical Abstract