June 28, 2016 - About a thousand liters of sulfuric acid leaked from the construction site of a smelter factory in the country's industrial city of Ulsan Tuesday, injuring six workers, firefighters said.  The incident took place at around 9:15 a.m. at a factory owned by Korea Zinc Inc., the country's largest zinc smelter, some 414 kilometers southeast of Seoul.  The chemical at some 70 percent concentration leaked as six workers were disassembling pipes for maintenance. All six are suffering from burns, with three of them in critical condition, authorities said.  Firefighters said they are investigating whether there is any secondary damage from the accident.  Earlier in the day, about a ton of waste chemicals comprised of hydrochloric acid, nitric acid, hydrofluoric acid and water spilled out of a tank due to chemical reactions in Gumi, 261 kilometers southeast of Seoul.  The firefighters completed cleanup of the spilled chemicals at around 5:30 a.m., about three hours after the incident was first reported.  They said no harmful chemical substances were detected near the site of the accident. 

April 20, 2009 - GEA Bischoff received an order for 1 horizontal dry electrostatic precipitator from Korea Zinc Co. Ltd. The off-gases from a new lead smelter in Onsan, South Korea will be cleaned.  With this contract Korea Zinc Co. Ltd. continuous the longtime cooperation with GEA Bischoff, who since the year 1993 supplied 11 dry and 20 wet precipitators as well as various other gas cleaning equipment to this client.

November 26, 2008 - Ausmelt Limited (AET) has signed a Licensing Agreement with Korea Zinc Co. Ltd (Korea Zinc) for the construction of two new Top Submerged Lance (TSL) technology furnaces for lead smelting.  The two new furnaces will be built at Korea Zinc.s production facilities in Onsan, Korea. They will recover lead from up to 70,000 tonnes per annum of lead-bearing materials, including lead secondaries.