Device and method for recovering arsenic and gallium

A method of using a device for recovering arsenic and gallium,

• the device for recovering arsenic and gallium comprising:
• a closed furnace body, a vacuuming mechanism and a vacuuming pipe, wherein the closed furnace body is in communication with the vacuuming pipe, and the vacuuming pipe is connected to the vacuuming mechanism;
• the closed furnace body comprises a first furnace body, a second furnace body and a third furnace body;
• a first heating mechanism and a graphite crucible are arranged inside the first furnace body, the first heating mechanism being configured to be used for heating the graphite crucible, and the graphite crucible being configured to be used for eventually collecting gallium;
• a second heating mechanism and a first collection cylinder are arranged inside the second furnace body, the second heating mechanism being configured to be used for heating the first collection cylinder, and the first collection cylinder being configured to be used for collecting gallium arsenide;
• a second collection cylinder is arranged inside the third furnace body, the second collection cylinder being configured to be used for collecting arsenic;
• the first furnace body is detachably connected to the second furnace body, and the second furnace body is detachably connected to the third furnace body;
• and the graphite crucible is in communication with the first collection cylinder, and the first collection cylinder is in communication with the second collection cylinder;
• the first collection cylinder comprises an upper communication port and a lower communication port, the upper communication port being in communication with the second collection cylinder, the lower communication port being in communication with the graphite crucible, and the upper communication port and the lower communication port not being located on the same vertical line;
• a heat-insulating layer is arranged between the first furnace body and the second furnace body;
• and a heat-insulating layer is arranged between the second furnace body and the third furnace body;
• and a liquid cooling mechanism is arranged at the third furnace body;
• the method comprising the following steps:
• S100:
• placing gallium arsenide waste in the graphite crucible, and vacuuming the closed furnace body to 1-10 Pa by the vacuuming mechanism;
• S200:
• keeping the vacuuming mechanism continuously vacuuming, heating the graphite crucible by the first heating mechanism at a heating temperature of 800-1200° C. for a heating time of 60-240 min;
• and heating the first collection cylinder by the second heating mechanism at the same time at a heating temperature of 500-800° C.;
• and S300:
• stopping heating by the first heating mechanism and the second heating mechanism, closing the vacuuming mechanism after the closed furnace body is cooled to room temperature, and collecting the gallium from the graphite crucible, the gallium arsenide from the first collection cylinder, and the arsenic from the second collection cylinder.