In 2014, more than 43 cities in China were racing to construct their urban rail systems (including metro and light rail systems), recognizing that an urban rail system will be a good solution to the tough problems that they are faced with, including traffic congestion and PM2.5 air pollution. On...

The accumulation of hazardous arsenic-alkali slag (AAS) poses a great threat to the environment, and the difficulty of AAS disposal lies in the selective separation of arsenic and alkali in the leaching solution. According to the precipitation thermodynamic analysis of the Mg 2+ -NH 4 + -CO 3 2-...