Constraint， project constraint

crash-ball mill-magnetic separation-gravity separation

gravity separation by shaking table-high intensity magnetic separation

gravity separation-magnetic separation

Iron separation by low intensity magnetic separation

New technology of magnetic separation-flotation separation

separation and separation

separation tower separation column

separation-reaction-separation technique (= SRS technique)

3D constraint

3-D constraint inversion

3D geometric constraint

abundance sum-to-one constraint(ASC)

access constraint

access right constraint

accuracy constraint

action constraint

action number constraint

active constraint