Valuable metal collaborative recovery method for waste circuit board and tin stripping waste liquid

The invention discloses a valuable metal collaborative recovery method for waste circuit boards and tin removal waste liquid. The method includes the steps of soaking the waste circuit boards in the tin removal waste liquid at normal temperature and under normal pressure; and after the soaking is completed, taking out the circuit boards and removed components, and carrying out fractional precipitation recovery of valuable metals in leachate at the normal temperature and under the normal pressure. The sequence of precipitation is as follows: adding sodium hydroxide to precipitate tin, wherein the pH value is 0.5-2.5, and adding sulfuric acid to precipitate lead, wherein the mole ratio of SO4 to Pb is greater than 1.4; adding the sodium hydroxide to precipitate iron, wherein the pH value is 2.5-4.0; adding the sodium hydroxide to precipitate copper, wherein the pH value is 4.5-6.5; and adding the sodium hydroxide to precipitate zinc, wherein the pH value is 6.5-8.5. According to the valuable metal col