acoplamientos flender H3-DH-7-A Helical gear Reduction Box H3

Flender/Flender Gear Units/Helical gear Reduction Box H3

e positions. While the fluorine is almost totally accumulated and incorp- orated in the cement clinker, the iodine is no longer detectable, like the heavy metal thallium. Chlorineand, inrrticula!, bromineare likewise bighlyvolatileandtheirbehaviourismoresimi- lar to that of io ine in this respect. All halogensaccumulate in the electrostatic precipitator dust, likethe volatile heavy talsand alkalis. The elements mentioned, with the exception of fluorine and iodine, are foundiin parti- cularly high concentrations in the very fine clean gas dust. The accumulation behaviour of the elements otassium, fluorine and chlorine in cyclone pre- heater cement kiln plant was investigated anfdiscussed as regards the conditions in the indivi- dual cyclone stages. In contrast to all elements investigated here, iodine is largely (about half of the total input) emitted in non-dust-bound form via the clean cement kiln gas. Types of bond (specification) of the trace elements chromium, thallium and iodine in the cement production process To date, cement clinker, and the cement grades manufactured therefrom, were the only sample materials from the cement industry to under2 investigations of their chromate cont- ent. In this work, the chromate contents and the Cr +/Cr6+ ratios in electrostatic precipitator dust from cement kiln plants with grate preheater are given as function of the oxidising and/or reducing nature of the kiln atmosphere. In the cement production process,the traceelements iodineand thallium preferablyform vola- tile thallium iodide, despite the available surplus of other potential bonding partners (potas- sium for iodine, chlorine and bromine for thallium). In the presence of oxygen, the thallium iodide formed is subject to thermal attackand iodine separation (this also applies to thallium bromide to smaller extent). In contrast, thallium chloride proves to be inert under comparable conditions. The thallium, which is lar ely bound to iodine, i