Preparation system with rotary valves for magnetic particles for heavy metal contamination reduction and remediation of contaminated farmland soil

A preparation system with rotary valves for magnetic particles for heavy metal contamination reduction and remediation of contaminated farmland soil, comprising a raw material modifying tank (1), a mixed liquid pre-stirring tank (2), a mixed liquid preparation tank (3), a mixed liquid degassing storage tank (4), a dropping device (5), and a magnetic particle solidification device (6),

• wherein an output port of the raw material modifying tank (1) is in communication with a first feed inlet on the mixed liquid preparation tank (3), an output port of the mixed liquid pre-stirring tank (2) is in communication with a second feed inlet on the mixed liquid preparation tank (3);
• the mixed liquid preparation tank (3), the mixed liquid degassing storage tank (4) and the dropping device (5) are serially connected in sequence;
• the magnetic particle solidification device (6) is arranged below the dropping device (5), and the dropping device (5) comprises a dropping storage chamber (501), a dropping seat body (502), and the rotary valves (506);
• the mixed liquid degassing storage tank (4) is in communication with the dropping storage chamber (501), rotary valve cavities and a piston mounting seat (504) are arranged inside the dropping seat body (502), and the rotary valves (506) are rotatably arranged in the rotary valve cavities;
• material sucking pipes (5061) and material passing pipes (5062) axially perpendicular to the material sucking pipes (5061) are arranged inside each of the rotary valves (506);
• piston cavities (5041) are formed in the piston mounting seat (504), and liftable pistons (503) are arranged in the piston cavities (5041);
• a dropping plate (508) is arranged below the rotary valve cavities, feeding pipes (5081) and dropping holes (5082) are arranged on the dropping plate (508) in a staggered manner, and the feeding pipes (5081) are in communication with the dropping storage chamber (501);
• when the rotary valves (506) are rotated to a suction position, lower ends of the material sucking pipes (5061) are respectively in communication with the feeding pipes (5081), and upper ends of the material sucking pipes (5061) are respectively in communication with the piston cavities (5041);
• and when the rotary valves (506) are rotated to a dropping position, upper ends of the material passing pipes (5062) are respectively in communication with the piston cavities (5041), and lower ends of the material passing pipes (5062) are respectively in communication with the dropping holes (5082).