[Retracted] Treatment of Comprehensive Wastewater from Chemical and Pharmaceutical Parks by Fly Ash-Coated Iron Electrode Electrocoagulation

Table 4

Iron content analysis.

Mill type	Average particle size	Iron content
Sanmenxia lime	20.46	2.517
Disc grinding fine ash	2.19–11.24	2.801–1.986
Ring roller grinding fine ash	3.41–11.26	2.648–3.117
Vibration grinding fine ash	2.11–11.46	2.076–2.814
Ball mill ash	3.017–11.01	3.27–3.812