Antimony Arsenic Separation from Leach Solution
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Solution Overview
Problem
Current metallurgical processes do not provide a satisfactory method for separating metal sulfides from mixed sulfide ores or concentrates, particularly those containing antimony and arsenic, and do not effectively remove deleterious elements, leading to high separation costs and inefficient recovery of valuable metals.
Innovation Solution
A process involving flotation to separate antimony and arsenic sulfides from other metals, followed by leaching and oxidation to produce precipitates and stable compounds, allowing for the recovery of metal sulfides and removal of deleterious elements, with the use of reagents like sulfite salts and caustic starch solutions, and subsequent recycling and stabilization of leach solutions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional metallurgical processes are used to process mixed sulfide ores, then metal recovery is achieved, but satisfactory separation of metal sulfides and removal of deleterious elements like antimony and arsenic is not achieved, leading to high separation costs
Solution Approach 1:
The process segments the mixed sulfide ore processing into distinct stages: flotation to separate metal sulfides from deleterious elements, leaching to dissolve target metals, and selective precipitation to recover individual metals. This segmentation enables precise separation of metal sulfides from antimony and arsenic, achieving both high separation precision and efficiency
Solution Approach 2:
The process extracts deleterious elements (antimony and arsenic) from the mixed sulfide ore through flotation, separating them into a separate concentrate. This extraction removes the harmful components before further processing, enabling clean recovery of valuable metals without contamination
2Manufacturing precision
If flotation is used to separate metal sulfides, then separation of antimony and arsenic is achieved, but additional processing steps are required for leaching and precipitation
Solution Approach 1:
The leach solution serves multiple functions: it dissolves target metals from the flotation concentrate, acts as a medium for selective precipitation, and enables recovery of both copper and other metals from the same solution. This multi-functionality reduces overall process complexity despite the multiple separation steps
Solution Approach 2:
The process controls precipitation by changing solution parameters (pH, concentration, temperature) to selectively precipitate different metals from the leach solution. By adjusting these parameters, the process achieves precise separation without requiring complex equipment for each individual metal recovery
3Object-generated harmful factors
If oxidation is used to produce antimony and arsenic precipitates, then deleterious elements are removed, but oxidation reagents and monitoring systems are required
Solution Approach 1:
The process uses feedback control through ORP (oxidation-reduction potential) monitoring to track the oxidation state of the leach solution. This feedback enables precise control of the oxidation process, ensuring complete removal of deleterious elements while avoiding excessive oxidation that could affect target metals. The real-time monitoring simplifies process control despite the chemical complexity
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This process effectively separates and recovers metal sulfides, such as copper and lead, while removing antimony and arsenic, achieving high extraction rates and producing stable compounds compliant with environmental standards, thereby reducing costs and improving the efficiency of metal recovery.
Implementation Method 1
subjecting the mixed sulfide concentrate to flotation in which at least one sulfide comprising antimony, arsenic and the first metal is floated and at least one sulfide comprising the second metal is depressed
Implementation Method 2
oxidizing the leach solution to yield an antimony precipitate and an arsenic solution
Data Source
AI summary
A stabilization process for an arsenic solution comprising thiosulfates, the process comprising: acidifying the arsenic solution to decompose the thiosulfates, to yield an acidified solution; oxidizing the acidified solution to oxidize residual As3+ to As5+ and reduced sulfur species to sulfates, to yield a slurry comprising elemental sulfur; separating elemental sulfur from the slurry to yield a liquid; oxidizing the liquid to oxidize residual reduced sulfur species, to yield an oxidized solution; and forming a stable arsenic compound from the oxidized solution.