Assertion: arsenic | /r/HasProperty | changed into difficulty
Facets:
value: by this technical scheme
type: CAUSE
value: by acidic oxidation
type: CAUSE
Source sentences:
text: Arsenic, with ferrous salt as raw material, is changed into difficulty by acidic oxidation by this technical scheme Being dissolved in the precipitated ferric arsenate of water, precipitated ferric arsenate reacts further in alkaline solution, forms one layer of densification on ferric arsenate surface Goethitum layer, ferric arsenate is carried out second protection, substantially increases the stability of ferric arsenate/goethitum material.