When a device is imported from China or manufactured domestically, a fee is tacked on that includes the price of recycling processing. Congress just has to pass a law, period.
Then recycling companies demonstrate responsible recycling and recover the fees. Fees are set per-product in order to ensure they are ultimately profitable.
Resulting pure compounds, proven to not require further recycling processing bad for the environment, can then be re-exported to China for use in manufacturing at market rates.
But as you say, it depends on Congress and on actual regulation and inspections/audits with teeth and meaningful penalties. To actually work, auditable photographic/video evidence of the entire workflow accounting for every single shipment would be a first step. But Congress depends on voters, so it's really up to us to force politicians to campaign on it.