Debris is seen at a control room after a furnace explosion at the Xinyu Iron and Steel Group Company in Xinyu City, east China's Jiangxi Province, April 1, 2013. A furnace exploded at 11:22 a.m. at the company on Monday, which killed four people and injured another 32. The injured have been hospitalized. (Xinhua/Song Zhenping)

Debris is seen at the site of a furnace explosion at the Xinyu Iron and Steel Group Company in Xinyu City, east China's Jiangxi Province, April 1, 2013. A furnace exploded at 11:22 a.m. at the company on Monday, which killed four people and injured another 32. The injured have been hospitalized. (Xinhua/Song Zhenping)

Debris is seen at the site of a furnace explosion at the Xinyu Iron and Steel Group Company in Xinyu City, east China's Jiangxi Province, April 1, 2013. A furnace exploded at 11:22 a.m. at the company on Monday, which killed four people and injured another 32. The injured have been hospitalized. (Xinhua/Song Zhenping)

Debris is seen at the site of a furnace explosion at the Xinyu Iron and Steel Group Company in Xinyu City, east China's Jiangxi Province, April 1, 2013. A furnace exploded at 11:22 a.m. at the company on Monday, which killed four people and injured another 32. The injured have been hospitalized. (Xinhua/Song Zhenping)

An injured worker is treated at the hospital of the Xinyu Iron and Steel Group Company after a furnace explosion in Xinyu, east China's Jiangxi Province, April 1, 2013. A furnace exploded at 11:22 a.m. at the company on Monday, which killed four people and injured another 32. The injured have been hospitalized. (Xinhua/Song Zhenping)

Firemen work at the site of a furnace explosion at the Xinyu Iron and Steel Group Company in Xinyu, east China's Jiangxi Province, April 1, 2013. A furnace exploded at 11:22 a.m. at the company on Monday, which killed four people and injured another 32. The injured have been hospitalized. (Xinhua/Song Zhenping)