An executive of the company said such a practice has multiple benefits in both economic and environmental terms.

China is a large consumer of iron ore.

In terms of improvement in rankings, China's Ansteel Group Corp made the highest jump across 183 places to 217.

China reduced as much air pollution in seven years as the United States did in three decades.

But to cut pollution, China has reduced steel production, leading to the closure of many plants.

China generated 1.25 trillion kilowatt-hours of electricity from renewable energy during the January-June period.

Compared with wet quenching, Mi said the new technique has economic and environmental benefits.

As a large coal supply base, Xinjiang aims to achieve coal output of more than 400 million tons by 2025.