Method for recovering gold in cyanide tailing by hierarchical ramified flotation

A method for recovering gold in a cyanide tailing by hierarchical ramified flotation, comprising the following steps:

• step 1:
• screen classification:
• slurrying a cyanide tailing (1) with water according to a mass concentration of 30-40%, and then conducting screen classification (2) through a Taylor standard sieve with a mesh size of 0.038 mm to obtain a coarse-grained product and a fine-grained product;
• step 2:
• coarse-grained roughing:
• slurrying the coarse-grained product obtained in step 1 with water according to a mass concentration of 30-35%;
• then sequentially adding a dispersant (sodium silicate:
• 500-700 g/t), an activator (copper sulfate:
• 100-120 g/t), a combined collector (MA-1:
• 30-40 g/t;
• ammonium dibutyl dithiophosphate:
• 15-20 g/t) and a frother (terpenic oil:
• 10 g/t);
• conducting coarse-grained roughing (3) to obtain a coarse-grained roughing concentrate (8) and a coarse-grained roughing tailing;
• step 3:
• first coarse-grained scavenging:
• adding a combined collector (MA-1:
• 15-20 g/t;
• ammonium dibutyl dithiophosphate:
• 10-15 g/t) and a frother (terpenic oil:
• 5 g/t) to the coarse-grained roughing tailing obtained in step 2;
• conducting first coarse-grained scavenging (4) to obtain a first coarse-grained scavenging concentrate (9) and a first coarse-grained scavenging tailing;
• returning the first coarse-grained scavenging concentrate (9) to the coarse-grained roughing (3) in step 2;
• step 4:
• second coarse-grained scavenging:
• adding a combined collector (MA-1:
• 8-10 g/t;
• ammonium dibutyl dithiophosphate:
• 5-8 g/t) to the first coarse-grained scavenging tailing obtained in step 3;
• conducting second coarse-grained scavenging (5) to obtain a second coarse-grained scavenging concentrate (10) and a second coarse-grained scavenging tailing (11);
• returning the second coarse-grained scavenging concentrate (10) to the first coarse-grained scavenging (4) in step 3;
• step 5:
• first coarse-grained cleaning:
• adding a dispersant (sodium silicate:
• 200-300 g/t) to the coarse-grained roughing tailing (8) obtained in step 2;
• conducting first coarse-grained cleaning (6) to obtain a first coarse-grained cleaning concentrate and a first coarse-grained cleaning tailing (13);
• returning the first coarse-grained cleaning tailing (13) to the coarse-grained roughing (3) in step 2;
• step 6:
• second coarse-gained cleaning:
• subjecting the first coarse-gained cleaning concentrate obtained in step 5 to second coarse-gained cleaning (7) without adding any reagent to obtain a second coarse-gained cleaning concentrate (12) and a second coarse-gained cleaning tailing (14);
• combining the second coarse-grained cleaning tailing (14) with the fine-grained product obtained by the screen classification (2) in step 1;
• step 7:
• fine-grained roughing:
• sequentially adding a dispersant (sodium silicate:
• 1000-1200 g/t), an activator (copper sulfate:
• 100-120 g/t), a combined collector (MOS-2:
• 30-40 g/t;
• MA-1:
• 10-16 g/t) and a frother (terpenic oil:
• 20-30 g/t) to a combined pulp of the fine-grained product obtained in step 1 and the second coarse-grained cleaning tailing (14) obtained in step 6;
• conducting fine-grained roughing (15) to obtain a fine-grained roughing concentrate (22) and a fine-grained roughing tailing;
• step 8:
• first fine-grained scavenging:
• adding a dispersant (sodium silicate:
• 500-600 g/t), a combined collector (MOS-2:
• 15-20 g/t;
• MA-1:
• 5-8 g/t) and a frother (terpenic oil:
• 10-15 g/t) to the fine-grained roughing tailing obtained in step 7;
• conducting first fine-grained scavenging (16) to obtain a first fine-grained scavenging concentrate (23) and a first fine-grained scavenging tailing;
• returning the first fine-grained scavenging concentrate (23) to the fine-grained roughing (15) in step 7;
• step 9:
• second fine-grained scavenging:
• adding a combined collector (MOS-2:
• 8-10 g/t;
• MA-1:
• 5 g/t) and a frother (terpenic oil:
• 5-8 g/t) to the fine-grained scavenging tailing obtain in step 8;
• conducting second fine-grained scavenging (17) to obtain a second fine-grained scavenging concentrate (24) and a second fine-grained scavenging tailing;
• returning the second fine-grained scavenging concentrate (24) to the first fine-grained scavenging (16) in step 8;
• step 10:
• third fine-grained scavenging:
• subjecting the second fine-grained scavenging tailing obtained in step 9 to third fine-grained scavenging (18) without adding any reagent to obtain a third fine-grained scavenging concentrate (25) and a third fine-grained scavenging tailing (26);
• returning the third fine-grained scavenging concentrate (25) to the second fine-grained scavenging (17) in step 9;
• step 11:
• first fine-grained cleaning:
• adding a dispersant (sodium silicate:
• 600-700 g/t), a collector (MOS-2:
• 20-30 g/t) and a frother (terpenic oil:
• 10-15 g/t) to the fine-grained roughing concentrate (22) obtained in step 7;
• conducting first fine-grained cleaning (19) to obtain a first fine-grained cleaning concentrate and a first fine-grained cleaning tailing (28);
• returning the first fine-grained cleaning tailing (28) to the fine-grained roughing (15) in step 7;
• step 12:
• second fine-grained cleaning:
• adding a collector (MOS-2:
• 10-15 g/t) and a frother (terpenic oil:
• 5-8 g/t) to the first fine-grained cleaning concentrate obtained in step 11;
• conducting second fine-grained cleaning (20) to obtain a second fine-grained cleaning concentrate and a second fine-grained cleaning tailing (29);
• returning the second fine-grained cleaning tailing (29) to the first fine-grained cleaning (19) in step 11;
• step 13:
• third fine-grained cleaning:
• subjecting the second fine-grained cleaning concentrate obtained in step 12 to third fine-grained cleaning (21) without adding any reagent to obtain a third fine-grained cleaning concentrate (27) and a third fine-grained cleaning tailing (30);
• returning the third fine-grained cleaning tailing (30) to the second fine-grained cleaning (20) in step 12;
• and
• step 14:
• obtaining of final gold concentrate and final tailing:
• combining the second coarse-grained cleaning concentrate (12) obtained in step 6 and the third fine-grained cleaning concentrate (27) obtained in step 13 into a final gold concentrate;
• combining the second coarse-grained scavenging tailing (11) obtained in step 4 and the third fine-grained scavenging tailing (26) obtained in step 10 into a final tailing.