Maanshan Iron & Steel zinc dust and mud off the successful application of zinc and Technology -

Successful application of zinc dust and mud Maanshanwastes will undoubtedly improve the effectiveness of
dezincification Technologysteel companies. However, as recycling, gas mud zinc,
Solution recycling zinc enrichment in the blast furnacealkali metals and other harmful elements enriched
problem of harmful elements for high-qualityserious and the highest gas content of mud up to
resources Zinc blast furnace gas sludgeharm furnace,7.07% zinc, plus the amount of converter using zinc
state flow, and reduce the life of a blast furnace,scrap the gradual increase in soil Zn OG New
pollution of the atmospheric environment has beenConverter Content from the initial production 0.2% to
the production of a metallurgical complex technical1%, much higher than the blast furnace of tolerance.
problems. Maanshan Iron & Steel Co., Ltd.According to process requirements, the iron dust and
(hereinafter referred to as Ma Steel) has officially putsludge should be recycled after processing, but the
into operation first set of 200 000 t / a zinc dust andrecycling of zinc enrichment of the first problems to
zinc off mud rotary hearth furnace plant, Maanshansolve. Maanshan Iron & Steel Through technical
Iron & Steel Nippon Steel introduced the mostanalysis and experimental study, and Nippon Steel
advanced dust mud rotary hearth furnaceEngineering Corporation, Mitsubishi firms to carry out
dezincification technology, and self-integration, designtechnical cooperation, self-integrated design,
facilities, use of Maanshan Iron & Steel Tzuhuconstruction, China's first set of rotary hearth
harmless all the gas produced by New District andfurnace off zinc system, in addition to the
OG mud mud, metal of higher than 80% of the metalintroduction of some of the core device, the key and
pellets 140,000 tons / year of zinc rate of miss oversupporting facilities achieve localization.
85%. The implementation of the project on theThe project design process in sintering, blast furnace,
promotion of China's iron and steel industry inconverter dry zinc dust is 20 tons, and its products
the smelting process of the rare, rare micro-elementscan be used as blast furnace materials, rotary hearth
in the development of extraction technology tofurnace dust generated by the higher zinc, as zinc
enhance the metallurgical solid waste processingplant material, After the furnace exhaust emission Hill
capacity in the system of high value-added rawafter the waste heat boiler to produce steam, can
materials recycling, and promote the production ofslag generated in steel within the steel recycling.
metallurgical improvement of the economic andPromote the steel industry a rare, rare
technical indicators and so has a positive meaning.micro-elements in the development of extraction
First to solve the problem of zinc enrichmentBy zinc dust and mud rotary hearth furnace
Gas recycling cause mud, OG excessive soil zincdezincification own key technology integration,
content, much higher than the blast furnace of theremoval of trade enrichment of zinc in the blast
affordability of urgent de zincfurnace, metallurgy dust and sludge to achieve a high
Present, there are more than 700 steel companies,recycling to explore the entire industry and related
through restructuring and technologicalindustries play example
transformation, and many equipment and technologyMasteel the first domestic 200 000 t / a zinc dust
has reached the world advanced level. But the design,and zinc removal mud rotary hearth furnace
blast furnace gas sludge, zinc enrichment issue hasinstallation, trial production in May this year has been
not been a breakthrough solution to a serious threaton process optimization, control, production gradually
to the smooth line of blast furnace, high yield, lowstabilized to achieve zinc, alkali reduction of harmful
consumption and long life.elements of metal and metal iron, carbon recycling,
2007 9 months, Maanshan Iron & Steel built withreduce the accumulation of harmful elements in the
international advanced level project Tzu New 5 millionsystem of the blast damage, sound use of all the gas
tons. One blast furnace gas dust removal by wetproduced by New District and OG mud mud and
cleaning process, an annual output of blast furnacegetting 55% of the gross recovery Zinc Zinc 03,000
gas sludge of about 65 000 t / a (dry basis), gravitytons / year of metal is greater than 80% of the
filter dust 65 000 t / a, Blast Furnace dust 32 500 t /metal pellets 140,000 tons / year, and the
a; converter once wet flue gas purification dustsuperheated saturated steam, the system off for
removal process is also an annual output of cementmore than 85% zinc, 60% ranked alkali, low dust
OG 120 000 t / a (dry basis), the second converterconcentrations at 50mg/m3. The main products of
flue dust 31 000 t / a. Because, blast furnace gas inmetal pellets chemical composition, strength and rate
the mud 36% of total iron content of about 40%of removal of the physical and chemical properties of
carbon content, total iron content of BOF OG mud atzinc reached the design level, some indicators even
about 55%, carbon content of about 4% of othermore than similar products of Nippon Steel targets.
dust also carbon, iron, if effective use of these