Debromination of Waste Circuit Boards by Reaction in Solid and Liquid Phases: Phenomenological Behavior and Kinetics

被引：0

作者：

Conesa, Juan A. ^{[1
,2
]}

Gandon-Ros, Gerard ^{[1
,2
]}

Gomez-Rico, Maria F. ^{[1
,2
]}

Aracil, Ignacio ^{[1
,2
]}

机构：

[1] Univ Alicante, Dept Chem Engn, POB 99, E-03080 Alicante, Spain

[2] Univ Alicante, Inst Chem Proc Engn, POB 99, E-03080 Alicante, Spain

来源：

POLYMERS | 2023年 / 15卷 / 06期

关键词：

marble sludge; planetary ball mill; mechanochemistry; potassium carbonate; hydrothermal process; WEEE; electronic waste; BROMINATED FLAME RETARDANTS; POLYVINYL-CHLORIDE; MECHANOCHEMICAL DESTRUCTION; DECHLORINATION; TETRABROMOBISPHENOL; DEHALOGENATION; HYDROCARBONS; PYROLYSIS;

D O I：

10.3390/polym15061388

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 ; 080501 ; 081704 ;

摘要：

The debromination of waste circuit boards (WCBs) used in computer motherboards and components has been studied with two different pieces of equipment. Firstly, the reaction of small particles (around one millimeter in diameter) and larger pieces obtained from WCBs was carried out with several solutions of K2CO3 in small non-stirred batch reactors at 200-225 degrees C. The kinetics of this heterogeneous reaction has been studied considering both the mass transfer and chemical reaction steps, concluding that the chemical step is much slower than diffusion. Additionally, similar WCBs were debrominated using a planetary ball mill and solid reactants, namely calcined CaO, marble sludge, and calcined marble sludge. A kinetic model has been applied to this reaction, finding that an exponential model is able to explain the results quite satisfactorily. The activity of the marble sludge is about 13% of that of pure CaO and is increased to 29% when slightly calcinating its calcite at only 800 degrees C for 2 h.

引用

页数：13

共 30 条

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