Families who lived near the factory began bringing in sick children to hospitals and clinics in July and blamed the smelting factory for contaminating nearby soil, air and the area's water supply, the report said.
Local officials say they plan to relocate all 581 households living with 500 meters (1,600 feet) of the factory within the next two years, the report said.
Of the sickened children, 166 will be hospitalized and the remainder will receive at-home treatment to process the lead from their bodies, according to Xinhua.
A spokesman for the local government, surnamed Wang, confirmed the new numbers and said the case was under investigation but refused to comment on whether sicknesses are linked to environmental pollution caused by the smelting company. He refused to give his full name as us common among Chinese officials.
Factory accidents and chemical leaks are common in China and are often blamed on lax enforcement of environmental regulations and safety rules and poor worker training.
Lead poisoning can damage the nervous and reproductive system, cause high blood pressure, anemia, memory loss, and in extreme cases cause victims to fall into comas and die.
China's waterways, especially its major rivers, are dangerously polluted chemicals after decades of rapid economic growth and poor enforcement of pollution controls.
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