Zhengzhou Hongji Machinery Manufacturing Co.,Ltd Was found in 1968, professional in LWA, Leca equipments manufacturing. Abstract: Lightweight aggregate raw ... garding , chemical, construction etc field. Zhengzhou Hongji Machinery Manufacturing Co.,Ltd Was found in 1968, professional in LWA, Leca ... to the kiln for second use, the final products waiting for package after separation by the screen, ...