Process for recycling steel swarf sludge to produce an iron chloride solution
The two-step process of leaching steel swarf sludge with hydrochloric acid and subsequent precipitation effectively recycles steel swarf, achieving high iron recovery and purity, while addressing the challenges of alloying metal removal and cutting fluid aggregation.
WO2025058553A1PCT designated stage expired Publication Date: 2025-03-20ANFERRA AB
Patent Information
- Application Number
- PCT/SE2024/050783
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- Priority Date
- 2023-09-12
- Filing Date
- 2024-09-11
- Publication Date
- 2025-03-20
Smart Images
Figure SE2024050783_20032025_PF_FP_ABST
Abstract
Process for recycling steel swarf to produce an iron chloride solution, the process comprising: in a leaching step, dissolving steel swarf sludge in a hydrochloric acid solution, wherein the pH of the mixture of steel swarf sludge and hydrochloric acid is less than about 3, thereby forming an aqueous iron chloride slurry, and in a precipitation step, increasing the pH of the iron chloride solution to a pH value of about 3.5 to about 4.5, to precipitate non-iron steel alloying metals in the aqueous iron chloride solution.
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Citation Information
Patent Citations
Continuous production of ferrous chloride solution involves reacting granular steel scrap or other iron alloy with dilute hydrochloric acid in trickle bed reactor
DE19947552A1
Method for purifying iron chloride-base waste liquid containing chromium or the like
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Purification of iron chloride solution
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Process for making electrolytic iron
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