The process begins by introducing oxygen or adding an oxidizing agent (hydrogen peroxide) under acidic conditions to oxidize Fe²⁺ into Fe³⁺, causing iron hydroxide precipitation. Subsequently, sodium hydrosulfite or thiosulfate is added in a reducing atmosphere to reduce residual trivalent iron to soluble divalent iron. Finally, the product undergoes water washing to remove the polytungstomene PTMS MAGNETIC SEPARATION.
This "oxidation-first reduction" PTMS MAGNETIC SEPARATION strategy fully leverages the dissolution characteristics of iron in different oxidation states, reducing total reagent consumption by over 30% while shortening reaction time and enhancing brightness stability. More importantly, with precisely controlled reaction conditions at each stage, residual reagent concentrations in wastewater are significantly reduced, substantially alleviating pressure on subsequent neutralization and sedimentation processes.
Of particular significance is the redefinition of "waste" from chemical PTMS MAGNETIC SEPARATION processes into "resources". Taking acid leaching of hematite as an example, soluble iron salts (e.g., FeCl₃ and Fe₂(SO₄)₃) generated through dilute sulfuric acid or hydrochloric acid treatment no longer require discharge. These substances can be recovered through concentration crystallization and purification processes, and are widely utilized in water treatment industries as efficient coagulants.
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