Waelz kiln operation book

Currently isfahan is operating 4 waelz kilns each processing up to 500 tons per. The book is intended for scientists, engineers and technicians who deal with. Scheme of a waelz kiln for zinc recycling with sdhlprocess air lance and infrared camera for slag temperature. It gives thermal balance of the waelz kiln and analyses possible breeches of the operating practices. Zinc ore and a reductant often a form of coal are introduced into the kiln under flame to initiate the reaction. 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. For questions or problems with your specific application please contact north american kiln for assistance. See what the career and earning prospects are to decide if. It is operated counter currently at a rotational speed of. The recovery of zinc oxide from low grade zincbearing material by waelz kiln is a popular and economic method. Camera based identification and control of the waelz process. A german invention first put in use in 1925, the waelz kiln is a long and narrow, slowly rotating refractorylined continuous kiln see figure 2. Pdf identification and control of the waelz process using infrared.

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 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. Mar 29, 2019 learn what a kiln operator does and whats required to become one. 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.

Steelworks residues and the waelz kiln treatment of electric arc. 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. 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. This monograph sets forth physicochemical characterization of the waelz process and behaviour of various compounds of lead, zinc, cadmium, indium and others in the waelz processing. This plant recycles electric arc furnace eaf steel dust utilizing the waelz kiln technology. After 1 year of operation, an industrial plant producing 2000 ty of zinc cathode was designed. Despite research into multiple alternative technologies, the traditional waelz kiln is the most economically viable processing method for. The zinc enriched product is referred to as waelz oxide, and the reduced zinc by product as waelz slag. Indutec ezinex integrate process on secondary zinc.

The major component of the waelz process is the waelz kiln. The kiln book covers the principles of efficient design, building methods, refractory, materials, bricklaying procedures and instructions, fuels and firing systems, arches, flues, electric elements and general safety. In the waelz process, dust is treated in a rotary kiln where it is heated to approximately 1,200 c. Engitec also studied the indutec process, a pyrotechnology competitive to the waelz kiln. The technology employed at chicago and rockwood is the waelz kiln technology. 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. An overview on the influences of physical, chemical and. During eaf operation, electricarc furnace dust, eafd, is generated as a result of. The solid charge entering at the feed end is first dried and then heated up until the reaction starts. It pays significant attention to hardware equipment of the waelz process and lining of the waelz 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.