Method for froth-controlled flotation of argillaceous lepidolite ore

A method for froth-controlled flotation of argillaceous lepidolite ore, comprising the following steps:

• (1) crushing and grinding a lepidolite ore until a lepidolite monomer is dissociated, and adding water to obtain a pulp having a concentration of 29% to 37% by mass;
• (2) adding a depressant, a collector, and a froth control agent in sequence to the pulp obtained in step (1), and conducting roughing to obtain a roughing concentrate and a roughing tailing;
• (3) adding the depressant, the collector, and the froth control agent in sequence to the roughing tailing obtained in step (2), and conducting first scavenging to obtain a first scavenging concentrate and a first scavenging tailing;
• (4) subjecting the first scavenging tailing obtained in step (3) to second scavenging to obtain a second scavenging concentrate and a second scavenging tailing, the second scavenging tailing being a flotation tailing;
• (5) adding the depressant, the collector, and the froth control agent in sequence to the roughing concentrate obtained in step (2), and conducting first cleaning to obtain a first cleaning concentrate and a first cleaning tailing;
• (6) subjecting the first cleaning concentrate obtained in step (5) to second cleaning to obtain lithium concentrate I and a second cleaning tailing;
• (7) combining the first scavenging concentrate obtained in step (3), the second scavenging concentrate obtained in step (4), the first cleaning tailing obtained in step (5), and the second cleaning tailing obtained in step (6) to obtain a lithium-containing mixed middling, adding the collector and the froth control agent in sequence to the lithium-containing mixed middling, and conducting cleaning-scavenging to obtain lithium concentrate II and a cleaning-scavenging tailing, wherein the cleaning-scavenging tailing is recycled to the second scavenging in step (4);
• and
• (8) combining the lithium concentrate I obtained in step (6) and the lithium concentrate II obtained in step (7) to obtain a lithium concentrate product,
• wherein the depressant is a mixture of sodium carbonate and a water glass, the collector is a mixture of laurylamine, sodium lauryl sulfonate, and ethanol, and the froth control agent is a mixture of diesel oil, a polyether, and tributyl phosphate.