Systems and methods to chemically treat metal-bearing waste streams to recover value-added materials

A method for processing a metal-bearing waste stream, the method comprising:

• loading a powder feedstock into a first reactor, wherein the powder feedstock comprises at least one of a metal-bearing component and a sulfur bearing component;
• configure a processor to operate a processing sequence comprising at least one of a dissolution process and a precipitation process in one or more reactors, including the steps of:
• using a first dissolution process, wherein the first dissolution process comprises using a leach process performed by at least one of contacting, passing, and percolating an acid through the powder feedstock and collecting a leachate formed in a second reactor,
• responsive to collecting the leachate, use a sequential selective precipitation process at a predetermined pH to sequentially precipitate components, wherein a first predetermined pH is used to precipitate a first component from the leachate,
• responsive to precipitating the first component, separate by filtration the first component, and collect the first filtrate in at least one of the second reactor and a third reactor,
• responsive to collecting the first filtrate, use a base component to adjust the first filtrate to a second predetermined pH,
• using the sequential precipitation process at the second predetermined pH, precipitate a second component, separate by filtration the second component and generate a second filtrate, and
• using the sequential precipitation process to separate additional components based on the predetermined pHs of the component of interest.