... such as iron and waste water, waste water from electroplating factory, metallurgical wastewater, coal washing waste water, sewage treatment, sludge ... industrial, and improve cement quality, and construction adhesive, filled joint repair and the blocking Agent, soil improvement, and electroplating ... speed control in 100~300rpm. Proper heating (< 60 ° c), you can speed up the dissolution.3, adjust the PH ...