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首页> 外文期刊>Journal of Environmental Science and Health. A, Toxic/Hazardous Substances & Environmental Engineering >Heavy Metals in the Products of Deinking Flotation of Digital Offset Prints
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Heavy Metals in the Products of Deinking Flotation of Digital Offset Prints

机译：数字胶印脱墨浮选产品中的重金属

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This study was undertaken to investigate the suitability of applying the conventional method of chemical deinking flotation of digital offset prints and ecological implications of the disposal of digital offset prints, with special emphasis on the content of heavy metal cations. The EDXRF method was used to determine the concentrations of Pb, Zr, Sr, As, Co, Zn, Cu, Ni, Fe, Mn, Cr, V, Ti, Ca, and K cations in handsheet ashes after flotation as well as in ashes of foams separated from cellulose suspension in the flotation phase. The same method was applied to determine the concentrations of Pb, Cr, Mn, Fe, Ni, Cu, Zn, and Co in process water filtrates obtained from the cellulose suspension after flotation and in foam filtrates. Centrifuging and coagulation previously treated flotation process water, while foam filtrates were centrifuged. Concentrations of Pb, As, Sr, Zr, K, Ca, Ti, V, Cr, Mn, Fe, Cu, and Zn were determined in the sediments obtained by centrifuging process water. The trials were done with unprinted substrates without deinking chemicals, with unprinted substrates in the presence of deinking chemicals and with printed substrates in the presence of deinking chemicals. Cation analysis revealed that deinking chemicals facilitate release of cations from the substrate and their transition into process water. Concentrations of most cations in the flotation process water, in foam water as well as in the sediment of the process water of printed substrate flotation deinking were lower than those obtained by flotation of unprinted substrate suspension. Polymer particles of ElectroInk incompletely separated from cellulose fibers prevent release of cations from cellulose fibers into process water. Deinking chemicals do not affect release of cations from ElectroInk particles, so the substrate is the main source of increased concentration of cations in the water of digital offset print deinking. The major part of cations in process water is bound to the colloid particles of the filler (CaCO_3) released by substrate disintegration and to particles of fine fibers.
机译：进行这项研究是为了研究应用常规方法对数字胶版印刷品进行化学脱墨浮选以及处理数字胶版印刷品的生态意义，并特别着重于重金属阳离子的含量。用EDXRF法测定浮选以及浮选后的烟灰中铅，锌，锶，砷，钴，锌，铜，镍，铁，锰，铬，钒，钛，钙和钾阳离子的浓度。在浮选阶段从纤维素悬浮液中分离出泡沫的灰烬。采用相同的方法确定浮选后从纤维素悬浮液获得的工艺用水滤液中和泡沫滤液中Pb，Cr，Mn，Fe，Ni，Cu，Zn和Co中Pb，Cr，Mn的浓度。离心和凝结处理过的浮选工艺用水，而泡沫滤液则进行了离心分离。通过离心工艺水获得的沉积物中测定了Pb，As，Sr，Zr，K，Ca，Ti，V，Cr，Mn，Fe，Cu和Zn的浓度。该试验是在没有油墨脱墨的情况下对未印刷的基材，在油​​墨脱墨的情况下对未印刷的基材以及在油墨脱墨的情况下对已印刷的基材进行的。阳离子分析表明，脱墨化学物质可促进阳离子从基质中释放出来并过渡到工艺用水中。浮选工艺水，泡沫水中以及印刷基板浮选脱墨过程水沉淀物中大多数阳离子的浓度低于未浮选基板悬浮液浮选所获得的阳离子浓度。 ElectroInk的聚合物颗粒与纤维素纤维不完全分离，可防止阳离子从纤维素纤维释放到工艺用水中。脱墨化学品不会影响ElectroInk颗粒中阳离子的释放，因此基材是增加数字胶印脱墨水中阳离子浓度的主要来源。生产用水中的阳离子的大部分与基质分解产生的填料胶体颗粒（CaCO_3）以及细纤维颗粒结合。

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