Method for enriching valuable metal minerals in tailings

Abstract

The invention relates to a method for refining valuable metal minerals in tailings. The method comprises the following operating steps: with an aqueous solution of sodium hexametaphosphate as a dispersant, dispersing the tailings, grading fine granules of the tailings according to the size of granularity, carrying out gravity separation on the graded tailings, and refining valuable metals obtained after gravity separation. According to the method disclosed by the invention, the tailings are processed by adopting simple process flows, the tailing resources are sufficiently utilized, multiple valuable metal minerals in the tailings are enriched, and thus the beneficiation feed grade of the flows is improved and relatively high concentrate grade and recycling rate can be obtained; meanwhile, the flow processing capability is also improved and the equipment load is alleviated. According to the method, fewer dispersant is used, the process flows are simple and easy to operate, the energy consumption is reduced, and thus the processing cost of the tailings is reduced and the economic benefit for site selection is increased.

Description

technical field

[0001] The invention relates to a method for enriching metal tailings, in particular to a method for enriching valuable metal minerals in tailings. Background technique

[0002] Tailings are discarded products after mineral processing. Since the minerals that are easy to be selected have been recovered, the rest are minerals with poor selectivity. Therefore, the content of valuable metals in tailings is not only low, but also difficult to obtain. In addition, after stacking, the tailings are not only bonded into agglomerates, but also the metal minerals are seriously oxidized, and the particle size is fine and mixed with impurities, making it more and more difficult for valuable metals to be recycled, except for a small part used in tunnels. Most of the backfill and brick paving or other uses have been piled up in the mining area for many years. This will not only cause a waste of resources, but also pollute the environment and cause a burden to the environm...

Examples

Embodiment 1

[0016] Raw material (contents are all in mass percentage): tin polymetallic tailings, particle size is 5-120 μm, tin content is 0.30%, lead content is 0.25%, antimony content is 0.21%, zinc content is 0.85%, sulfur content is 5.87%, The gangue minerals contain 30.11% silica and 35.15% calcium carbonate.

[0017] Prepare an aqueous solution with a mass percentage of 5% sodium hexametaphosphate, put 157.5g sodium hexametaphosphate per ton of tailings to disperse the tailings, and then divide the tailings into 14-34μm, 34-54μm, 54-74μm , 74~94μm four size grades, and then the 14~34μm and 34~54μm size grade tailings are re-selected by grooved spiral chute respectively, and the 54~74μm and 74~94μm size grade tailings are re-selected by ordinary spiral chute respectively The tailings obtained after re-selection of the four particle sizes are combined to obtain the enriched product.

[0018] The product obtained after enrichment was tested, and it was detected that the tin content i...

Embodiment 2

[0020] Raw materials (the contents are all in mass percentage): lead-zinc polymetallic tailings with a particle size of 5-120 μm, a lead content of 0.53%, a zinc content of 0.92%, a sulfur content of 4.12%, and a gangue mineral silica content of 27.61%. The calcium carbonate content is 17.46%, and the aluminum salt content is 26.10%.

[0021] Sodium hexametaphosphate is prepared into an aqueous solution with a mass percentage of 7%, and 244g of sodium hexametaphosphate is put into each ton of tailings to disperse the tailings, and then the tailings are divided into 14-34μm, 34-54μm, 54-74μm, 74 ~94μm four particle grades, and then the 14~34μm and 34~54μm size grade tailings are re-selected by grooved spiral chute respectively, and the 54~74μm and 74~94μm size grade tailings are re-selected by ordinary spiral chute respectively. Combine the tailings obtained by re-selecting the four particle sizes separately to obtain the enriched product.

[0022] The product obtained after e...

Embodiment 3

[0024] Raw materials (the contents are all in mass percentage): copper-lead-zinc polymetallic tailings, particle size is 5-120 μm, copper content is 0.13%, lead content is 0.37%, zinc content is 0.93%, sulfur content is 3.15%, gangue mineral two The silicon oxide content is 39.61%, and the calcium carbonate content is 27.66%.

[0025] Sodium hexametaphosphate is prepared as an aqueous solution with a mass percentage of 9%, and 330g of sodium hexametaphosphate is put into each ton of tailings to disperse the tailings, and then the tailings are divided into 14-34μm, 34-54μm, 54-74μm, 74 ~94μm four particle grades, and then the 14~34μm and 34~54μm size grade tailings are re-selected by grooved spiral chute respectively, and the 54~74μm and 74~94μm size grade tailings are re-selected by ordinary spiral chute respectively. Combine the tailings obtained by re-selecting the four particle sizes separately to obtain the enriched product.

[0026] The product obtained after enrichment ...

technical field

[0001] The invention relates to a method for enriching metal tailings, in particular to a method for enriching valuable metal minerals in tailings. Background technique

[0002] Tailings are discarded products after mineral processing. Since the minerals that are easy to be selected have been recovered, the rest are minerals with poor selectivity. Therefore, the content of valuable metals in tailings is not only low, but also difficult to obtain. In addition, after stacking, the tailings are not only bonded into agglomerates, but also the metal minerals are seriously oxidized, and the particle size is fine and mixed with impurities, making it more and more difficult for valuable metals to be recycled, except for a small part used in tunnels. Most of the backfill and brick paving or other uses have been piled up in the mining area for many years. This will not only cause a waste of resources, but also pollute the environment and cause a burden to the environm...

Examples

Embodiment 1

[0016] Raw material (contents are all in mass percentage): tin polymetallic tailings, particle size is 5-120 μm, tin content is 0.30%, lead content is 0.25%, antimony content is 0.21%, zinc content is 0.85%, sulfur content is 5.87%, The gangue minerals contain 30.11% silica and 35.15% calcium carbonate.

[0017] Prepare an aqueous solution with a mass percentage of 5% sodium hexametaphosphate, put 157.5g sodium hexametaphosphate per ton of tailings to disperse the tailings, and then divide the tailings into 14-34μm, 34-54μm, 54-74μm , 74~94μm four size grades, and then the 14~34μm and 34~54μm size grade tailings are re-selected by grooved spiral chute respectively, and the 54~74μm and 74~94μm size grade tailings are re-selected by ordinary spiral chute respectively The tailings obtained after re-selection of the four particle sizes are combined to obtain the enriched product.

[0018] The product obtained after enrichment was tested, and it was detected that the tin content i...

Embodiment 2

[0020] Raw materials (the contents are all in mass percentage): lead-zinc polymetallic tailings with a particle size of 5-120 μm, a lead content of 0.53%, a zinc content of 0.92%, a sulfur content of 4.12%, and a gangue mineral silica content of 27.61%. The calcium carbonate content is 17.46%, and the aluminum salt content is 26.10%.

[0021] Sodium hexametaphosphate is prepared into an aqueous solution with a mass percentage of 7%, and 244g of sodium hexametaphosphate is put into each ton of tailings to disperse the tailings, and then the tailings are divided into 14-34μm, 34-54μm, 54-74μm, 74 ~94μm four particle grades, and then the 14~34μm and 34~54μm size grade tailings are re-selected by grooved spiral chute respectively, and the 54~74μm and 74~94μm size grade tailings are re-selected by ordinary spiral chute respectively. Combine the tailings obtained by re-selecting the four particle sizes separately to obtain the enriched product.

[0022] The product obtained after e...

Embodiment 3

[0024] Raw materials (the contents are all in mass percentage): copper-lead-zinc polymetallic tailings, particle size is 5-120 μm, copper content is 0.13%, lead content is 0.37%, zinc content is 0.93%, sulfur content is 3.15%, gangue mineral two The silicon oxide content is 39.61%, and the calcium carbonate content is 27.66%.

[0025] Sodium hexametaphosphate is prepared as an aqueous solution with a mass percentage of 9%, and 330g of sodium hexametaphosphate is put into each ton of tailings to disperse the tailings, and then the tailings are divided into 14-34μm, 34-54μm, 54-74μm, 74 ~94μm four particle grades, and then the 14~34μm and 34~54μm size grade tailings are re-selected by grooved spiral chute respectively, and the 54~74μm and 74~94μm size grade tailings are re-selected by ordinary spiral chute respectively. Combine the tailings obtained by re-selecting the four particle sizes separately to obtain the enriched product.

[0026] The product obtained after enrichment ...