During eaf operation, electricarc furnace dust, eafd, is generated as a result of. Pdf identification and control of the waelz process using infrared. Mar 29, 2019 learn what a kiln operator does and whats required to become one. It is operated counter currently at a rotational speed of. The waelz process is a method of recovering zinc and other relatively low boiling point metals from metallurgical waste and other recycled materials using a rotary kiln.
Rotary kilns transport phenomena and transport processes. The waelz process is applied on industrial scale in the metallurgy of zinc and it is designed to the enrichment of materials with low metal content to produce a concentrated zinc oxide waelz oxide. The furnace can treat various zinc material such as low grade zinc oxide ore, zinc leaching residue, zincbearing water quenched slag from lead smelting, zinc electrolyte purification precipitate. After 1 year of operation, an industrial plant producing 2000 ty of zinc cathode was designed. Informatics in control, automation and robotics, pp. The first section of the book traces the development of individual kilns, stressing their firing principles and their strengths and weaknesses. Camera based identification and control of the waelz process. Despite research into multiple alternative technologies, the traditional waelz kiln is the most economically viable processing method for. Beginning with primitive firing methods, rhodes moves on to the evolution of kilns in china, korea, and japan, and then discusses the history and growth of europeans kilns. The recovery of zinc oxide from low grade zincbearing material by waelz kiln is a popular and economic method. Steelworks residues and the waelz kiln treatment of electric arc. For questions or problems with your specific application please contact north american kiln for assistance.
It pays significant attention to hardware equipment of the waelz process and lining of the waelz kiln. The major component of the waelz process is the waelz kiln. The solid charge entering at the feed end is first dried and then heated up until the reaction starts. Currently isfahan is operating 4 waelz kilns each processing up to 500 tons per. Indutec ezinex integrate process on secondary zinc.
The rockwood facility has an annual waste processing capacity of 90,000 tons and the chicago plant will bring another kiln online early in 1994, boosting itos capacity to 180,000 tonsyr. It gives thermal balance of the waelz kiln and analyses possible breeches of the operating practices. See what the career and earning prospects are to decide if. An overview on the influences of physical, chemical and. Scheme of a waelz kiln for zinc recycling with sdhlprocess air lance and infrared camera for slag temperature. The waelz process is applied on industrial scale in the metallurgy of zinc and it is designed to the enrichment of materials with low metal content to produce a concentrated zinc oxide waelz.
The waelz process is a method of recovering zinc and other relatively low boiling point metals from metallurgical waste typically eaf flue dust and other recycled materials using a rotary kiln waelz kiln. Regardless of rotary kiln size or configuration the basic principles outlined in this manual govern the reliable operation of every rotary kiln, calciner, dryer, incinerator, digester and cooler application. In the waelz process, dust is treated in a rotary kiln where it is heated to approximately 1,200 c. The technology employed at chicago and rockwood is the waelz kiln technology. This plant recycles electric arc furnace eaf steel dust utilizing the waelz kiln technology. The book is intended for scientists, engineers and technicians who deal with. The zinc enriched product is referred to as waelz oxide, and the reduced zinc by product as waelz slag.
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