CN115814954A - Gold concentrate pre-leaching short-flow flotation method and system - Google Patents
Gold concentrate pre-leaching short-flow flotation method and system Download PDFInfo
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Abstract
The invention discloses a gold concentrate pre-leaching short-flow flotation method and a gold concentrate pre-leaching short-flow flotation system. And classifying the ground ore products, and feeding overflow products into a stirring barrel for adding medicines and mixing slurry. After the pulp is mixed, the mixed concentrate is sent to a mixed separation system consisting of three flotation columns and comprising primary roughing, primary concentrating and primary scavenging, the mixed concentrate enters subsequent separation flotation operation, and the tailings serving as low-sulfur concentrate enter subsequent cyanidation operation. And adding chemicals into the concentrate obtained by the mixed flotation for size mixing, and pumping the concentrate to a separation system consisting of three flotation columns for primary roughing, primary concentrating and primary scavenging through a separation feed pump to obtain high-copper concentrate and high-sulfur concentrate. The method can effectively recover various metals of gold, silver, copper, lead and zinc in the gold concentrate, simultaneously enhances the separation efficiency and provides powerful guarantee for the subsequent cyaniding leaching operation. Under the condition of being simpler than the conventional flotation process, the comprehensive recycling of multi-metal resources is realized, the economic benefit of enterprises is improved, and the resource waste is reduced.
Description
Technical Field
The invention relates to a gold concentrate pre-leaching flotation equipment system and a gold concentrate pre-leaching flotation separation method.
Background
Gold mine resources in China are rich, but semi-crude gold mine is mainly used. In the aspect of multi-metal recovery of gold ore, foreign gold ore deposits have high grade and low mining cost and are mostly in a single flow, so foreign gold production enterprises do not form a scale and basically adopt a single operation form. Gold in domestic multi-metal sulfide type gold ores is often symbiotic with sulfide minerals such as silver, copper, lead, zinc and the like and oxide minerals, gold mainly exists in the sulfide ores and can be effectively enriched through flotation, but gold concentrate often contains various metals such as silver, copper, lead, zinc, iron and the like, comprehensive recovery of the multi-metal gold concentrate can realize comprehensive utilization of resources and can bring good economic benefits to enterprises.
Gold extraction by cyanidation is one of the most widely used gold ore dressing methods, and particularly, cyanidation is the most suitable method for gold concentrate. Most ore dressing plants adopt a production process of directly cyaniding and leaching gold concentrate, and then refloating leached slag to respectively obtain high-copper concentrate and high-sulfur concentrate. At present, the prior art of optimizing enrichment by flotation before leaching and then respectively cyaniding and leaching gold and silver is adopted, the process breaks through the traditional process flow of directly cyaniding and leaching gold and silver from gold concentrate, but the particles treated by flotation are all in a fine particle grade (-0.038 mu m content of more than 90%), and the application of the traditional flotation machine is limited to a certain extent, so that the final grade and recovery rate of metal are influenced.
Therefore, the traditional flotation machine has long flow, is difficult to recover fine particles, and has low system recovery rate and poor separation effect.
Disclosure of Invention
The invention aims to provide a gold concentrate pre-leaching short-flow flotation method and a system, and aims to solve the problems that: firstly, the aim of shortening the flotation process is achieved by changing the flotation method before leaching and the equipment system; and secondly, the recovery rate of fine materials is improved by strengthening the separation effect, so that a more reasonable separation process for the gold concentrate is formed, and the recovery rate and the separation efficiency are greatly improved.
The technical scheme adopted by the invention is as follows:
a gold concentrate pre-leaching short-flow flotation method is characterized by comprising the following steps:
a) Grinding and grading gold concentrate, feeding an overflow product into a mixed-flotation roughing stirring barrel, adding a collecting agent into the mixed-flotation roughing stirring barrel, feeding overflow ore pulp subjected to water adding and pulp mixing into a mixed-flotation roughing flotation column by a first feeding pump, feeding concentrate of the mixed-flotation roughing flotation column into a mixed-flotation fine-flotation column, and feeding tailings of the mixed-flotation roughing flotation column into a mixed-flotation scavenging flotation column by a second feeding pump; returning tailings of the mixed selection and fine selection flotation column and concentrate of the mixed selection and scavenging flotation column to the mixed selection and rough selection stirring barrel to form a circulation closed loop; the tailings of the mixed-flotation scavenging flotation column are used as low-sulfur concentrate to enter the subsequent cyaniding operation; the concentrate of the mixed selection and concentration flotation column enters a separation and roughing stirring barrel;
b) Adding a pyrite inhibitor and a chalcopyrite collector into a separation roughing stirring barrel in sequence, adding water and mixing pulp, then sending the ore pulp to a separation roughing flotation column by a third feed pump, enabling the concentrate of the separation roughing flotation column to flow into a separation concentrating flotation column, enabling the tailings of the separation roughing flotation column to be fed into a separation scavenging flotation column by a fourth feed pump, and returning the tailings of the separation concentrating flotation column and the concentrate of the separation scavenging flotation column to the separation roughing stirring barrel to form a circulation closed circuit; and the tailings of the separation scavenging flotation column are used as high-sulfur concentrate, and the concentrate of the separation and concentration flotation column is used as high-copper concentrate to respectively enter subsequent cyanidation operation.
Preferably, the fineness of the gold concentrate after grinding and grading in the step A) is required to be as follows: 70 to 95 percent of-400 meshes.
Preferably, the collectors in the step A) are butyl sodium xanthate and ethidium; in the step A), the adding amount of the collecting agent is 90-130g/t of butyl sodium xanthate and 90-130g/t of ethidium nitrate.
Preferably, in the step B), the pyrite inhibitor is lime, and the adding amount is 4800-5200g/t; in the step B), the chalcopyrite collecting agents are ammonium butyl black, butyl sodium xanthate and ethidium nitrate, and the adding amount of the chalcopyrite collecting agents is 50-60g/t of the ammonium butyl black, 10-15g/t of the butyl sodium xanthate and 5-10g/t of the ethidium nitrate.
Preferably, the flotation column is a cyclone-static microbubble flotation column.
The short-flow flotation system before gold concentrate leaching comprises a mixed-flotation roughing stirring barrel, a mixed-flotation roughing flotation column, a mixed-flotation concentrating flotation column, a mixed-flotation scavenging flotation column, a separation roughing stirring barrel, a separation roughing flotation column, a separation concentrating flotation column and a separation scavenging flotation column, and is characterized in that: an overflow outlet of the mixed-concentration roughing stirring barrel is connected with a feed inlet of the mixed-concentration roughing flotation column through a pipeline; the concentrate outlet of the mixed selection rough flotation column is connected with the feed inlet of the mixed selection fine flotation column through a pipeline; a tailing outlet of the mixed-concentration roughing flotation column is connected with a mixed-concentration scavenging stirring barrel through a pipeline, and the mixed-concentration scavenging stirring barrel is connected with a feeding hole of the mixed-concentration scavenging flotation column through a pipeline; the tailing outlet of the mixed selection and concentration flotation column and the concentrate outlet of the mixed selection and scavenging flotation column are respectively connected with the mixed selection and roughing stirring barrel through pipelines; the concentrate outlet of the mixed concentration flotation column is connected with a separation and distribution barrel through a pipeline, and the separation and distribution barrel is connected with the separation and roughing stirring barrel through a pipeline; an overflow outlet of the separation roughing stirring barrel is connected with a feed inlet of the separation roughing flotation column through a pipeline; the concentrate outlet of the separation and roughing flotation column is connected with the feed inlet of the separation and roughing flotation column through a pipeline; the tailing outlet of the separation roughing flotation column is connected with a separation scavenging stirring barrel through a pipeline, and the separation scavenging stirring barrel is connected with the feed inlet of the separation scavenging flotation column through a pipeline; the tailing outlet of the separation and concentration flotation column and the concentrate outlet of the separation and scavenging flotation column are respectively connected with the separation and roughing stirring barrel through pipelines.
Preferably, a first feeding pump is installed on a pipeline between the mixed-concentration rough-separation stirring barrel and the mixed-concentration rough-separation flotation column; a second feeding pump is arranged on a pipeline between the mixed selection scavenging stirring barrel and the mixed selection scavenging flotation column; a third feeding pump is arranged on a pipeline between the separation roughing stirring barrel and the separation roughing flotation column; and a fourth feeding pump is arranged on a pipeline between the separation scavenging stirring barrel and the separation scavenging flotation column.
Preferably, the flotation column is a swirl-static microbubble flotation column.
The invention has the positive effects that:
the invention adopts a cyclone-static microbubble flotation column to perform mixed flotation and separation flotation on gold concentrate. The hydromechanics multi-flow-state characteristic of the flotation column is fully utilized, a high turbulence mineralization multi-circulation separation mechanism for the materials difficult to float is constructed, the collision efficiency of ore particles and bubbles is greatly improved, the lower limit of mineral separation force is reduced, the recovery of fine materials is improved, the separation effect is strengthened, a more reasonable separation process and method for gold concentrates are formed, and the recovery rate and the separation efficiency are greatly improved.
The invention breaks through the conventional flotation machine mineral processing technology, fully utilizes the hydrodynamic multi-flow-state characteristic of the flotation column, and through adding the medicament, the reinforced stirring and the reinforced circulation and recovery of the flotation column, the flotation technology is simplified, the one-coarse two-fine three-sweep is shortened into one-coarse one-fine one-sweep, the recovery rate is greatly improved, and the separation effect is reinforced. The invention has the advantages of low sorting cost, simple arrangement, considerable economic and environmental benefits and obvious technical advantages for gold concentrates which are difficult to treat by fine particles, and can be suitable for pre-leaching flotation of similar gold concentrates.
The mixed concentrate with gold recovery rate averagely as high as 97.33% and sulfur grade averagely 46.74% is obtained by a mixed separation subsystem consisting of three flotation columns, and the subsequent separation flotation operation is carried out on the mixed concentrate, wherein the average gold grade in the low-sulfur concentrate is 4.49g/t, the average sulfur grade is 6.16%, and the average indexes of the grade and recovery rate of other metals in the mixed concentrate are mostly improved. Adding medicine into the concentrate obtained by the mixed flotation, mixing the concentrate into slurry, and pumping the slurry to a separation system consisting of three flotation columns for primary roughing, primary concentrating and primary scavenging through a separation feeding pump to obtain the high-copper concentrate with the gold grade averagely as high as 453.32g/t, wherein the average gold recovery rate is 77.84%, the gold grade of the high-sulfur concentrate is below 19g/t, the sulfur recovery rate is more than 92%, and the grade and average index of recovery rate of other metals in the high-copper concentrate are better than the on-site production index.
The method can effectively recover various metals of gold, silver, copper, lead and zinc in the gold concentrate, simultaneously enhances the separation efficiency and provides powerful guarantee for the subsequent cyaniding leaching operation. Under the condition of being simpler than the conventional flotation process, the comprehensive recycling of multi-metal resources is realized, the economic benefit of enterprises is improved, and the resource waste is reduced.
Drawings
Fig. 1 is a schematic diagram of the structure and the working principle of the short-flow flotation system before gold concentrate leaching.
In the figure, 1, a mixed selection roughing stirring barrel, 2, a first feeding pump, 3, a mixed selection roughing flotation column, 4, a mixed selection roughing flotation column, 5, a separation material separating barrel, 6, a separation roughing stirring barrel, 7, a third feeding pump, 8, a separation roughing flotation column, 9, a separation selection flotation column, 10, a separation scavenging stirring barrel, 11, a fourth feeding pump, 12, a separation scavenging flotation column, 13, a mixed selection scavenging stirring barrel, 14, a second feeding pump, 15, a mixed selection scavenging flotation column.
Detailed Description
The present invention will be described in detail with reference to examples.
Example 1: the invention relates to an embodiment of a short-flow flotation system for gold concentrate pre-leaching flotation.
As shown in fig. 1, the present embodiment includes a bulk roughing agitation vat 1, a bulk roughing flotation column 3, a bulk concentrating flotation column 4, a bulk scavenging flotation column 15, a bulk roughing agitation vat 6, a bulk roughing flotation column 8, a bulk concentrating flotation column 9, and a bulk scavenging flotation column 12.
An overflow outlet of the mixed flotation and roughing stirring barrel 1 is connected with a feed inlet of a mixed flotation column 3 through a pipeline with a first feed pump 2. The concentrate outlet of the mixed concentration rough concentration flotation column 3 is connected with the feed inlet of the mixed concentration fine concentration flotation column 4 through a pipeline. The tailing outlet of the mixed-flotation roughing flotation column 3 is connected with a mixed-flotation scavenging stirring barrel 13 through a pipeline, and the mixed-flotation scavenging stirring barrel 13 is connected with the feeding hole of a mixed-flotation scavenging flotation column 15 through a pipeline with a second feeding pump 14. And a tailing outlet of the mixed selection and concentration flotation column 4 and a concentrate outlet of the mixed selection and scavenging flotation column 15 are respectively connected with the mixed selection and roughing stirring barrel 1 through pipelines.
The concentrate outlet of the mixed concentration flotation column 4 is connected with a separation and distribution barrel 5 through a pipeline, and the separation and distribution barrel 5 is connected with the separation and roughing stirring barrel 6 through a pipeline.
The overflow outlet of the separation roughing stirring barrel 6 is connected with the feed inlet of the separation roughing flotation column 8 through a pipeline with a third feed pump 7. The concentrate outlet of the separation and roughing flotation column 8 is connected with the feed inlet of the separation and concentration flotation column 9 through a pipeline. The tailing outlet of the separation roughing flotation column 8 is connected with a separation scavenging stirring barrel 10 through a pipeline, and the separation scavenging stirring barrel 10 is connected with the feeding hole of a separation scavenging flotation column 12 through a pipeline with a fourth feeding pump 11. The tailing outlet of the separation and concentration flotation column 9 and the concentrate outlet of the separation and scavenging flotation column 12 are respectively connected with the separation and roughing stirring barrel 6 through pipelines.
Each flotation column is provided with a circulating pump.
In this example, three bulk flotation columns and three separation flotation columns constitute a rough-fine-sweep operation. And the gold concentrate after being ground by the grinding machine enters a classifier, an overflow product is conveyed to a mixed-flotation roughing stirring barrel 1, a collecting agent is added, and an overflow outlet of the mixed-flotation roughing stirring barrel 1 is connected with a mixed-flotation roughing flotation column 3 through a first feeding pump 2. The ore pulp is fed into a mixed selection rough flotation column 3 through a first feeding pump 2, the concentrate of the mixed selection rough flotation column 3 automatically flows into a mixed selection fine flotation column 4, the tailings of the mixed selection rough flotation column 3 automatically flow into a mixed selection scavenging stirring barrel 13, and then the ore pulp is fed into a mixed selection scavenging flotation column 15 through a second feeding pump 14. The scavenged concentrate and the selected tailings return to the mixed-concentration rough-separation stirring barrel 1 to form a circulating closed circuit. And the tailings of the mixed-separation scavenging flotation column 15 are used as low-sulfur concentrate to enter the subsequent cyaniding operation. The concentrate of the mixed concentration flotation column 4 automatically flows to a separation and separation bucket 5 for separation operation, and a gold concentrate feeding, pulp mixing and mixed concentration loop is completed.
And (3) completing mixed fine separation by the separation operation through a rough flotation column, a fine flotation column and three flotation columns in the same process mode of the mixed selection loop, and obtaining two products of high-sulfur concentrate and high-copper concentrate to enter subsequent cyanidation operation. The ore pulp in the separation and separation barrel 5 enters a separation and roughing stirring barrel 6, a pyrite inhibitor and a chalcopyrite collector are sequentially added into the separation and roughing stirring barrel 6, water is added for stirring and pulp mixing, the ore pulp is pumped to a separation and roughing flotation column 8 through a third feeding pump 7, the concentrate of the separation and roughing flotation column 8 automatically flows into a separation and concentration flotation column 9, the tailings of the separation and roughing flotation column 8 automatically flow into a separation and scavenging stirring barrel 10, and then the tailings are fed into a separation and scavenging flotation column 12 through a fourth feeding pump 11. The scavenged concentrate and the fine tailings are returned to the separation roughing stirring barrel 6 to form a circulation closed loop. The tailings of the separation and scavenging flotation column 12 are used as high-sulfur concentrate to enter the subsequent cyanidation operation. The concentrate from the separation and concentration flotation column 9 is used as high copper concentrate for subsequent cyanidation.
Example 2: the invention relates to a short-flow flotation method embodiment (I) of gold concentrate pre-leaching flotation.
Referring to fig. 1, the short-flow flotation method for gold concentrate pre-leaching flotation of the present embodiment includes the following steps.
A. The gold concentrate is subjected to mixed flotation after grinding and grading operation. Grinding gold concentrate from a certain mine belonging to Shandong gold company to obtain 93% ore fineness of-400 meshes, grading the ground ore product, allowing the graded overflow product to flow to a mixed-separation roughing stirring barrel 1, adding water to enable the concentration of ore pulp to reach 25% -27%, and adding 100g/t of collecting agent butyl sodium xanthate and 100g/t of ethyl sulfur nitrogen.
The overflow ore pulp after adding water and mixing pulp is fed into a mixed selection roughing flotation column 3 through a first feeding pump 2, the concentrate of the mixed selection roughing flotation column 3 flows into a mixed selection fine flotation column 4, the tailings of the mixed selection roughing flotation column 3 automatically flow into a mixed selection scavenging stirring barrel 13 firstly, and then are fed into a mixed selection scavenging flotation column 15 through a second feeding pump 14; the tailings of the mixed selection and concentration flotation column 4 and the concentrate of the mixed selection and scavenging flotation column 15 return to the mixed selection and roughing stirring barrel 1 to form a circulation closed circuit; the tailings of the mixed-flotation scavenging flotation column 15 are used as low-sulfur concentrate to enter the subsequent cyaniding operation; concentrate of the mixed concentration flotation column 4 firstly flows into a separation and separation barrel 5, and then flows into a separation and roughing stirring barrel 6 from the separation and separation barrel 5.
Through the operation of rough and fine cleaning of the cyclone-static microbubble flotation column, the average recovery rate of gold in the bulk concentrate is 97.33%, the average sulfur grade is 46.74%, the average gold grade in the low-sulfur concentrate is 4.49g/t, and the average sulfur grade is 6.16%. The results of the short-flow column flotation system and method for gold concentrate bulk flotation and the comparison thereof with the conventional full flotation machine system method are shown in table 1.
TABLE 1 index results of gold concentrate beneficiation of this example and comparison thereof with conventional methods
* Representing the difference between the results of the flotation column test and the concentrate yield of the production cell.
As can be seen from table 1, under the short flow column flotation system and method of the present invention, the result of the gold concentrate bulk flotation index is better than that of the traditional full flotation machine system and method, the vast majority of concentrate grade of the flotation column is better than that of the traditional flotation machine, and the recovery rate of each metal in the concentrate grade is also better than that of the flotation machine index. Under the flow of one rough one fine sweep of the flotation column, compared with a full flotation machine production system (the flow is one rough two fine sweeps and three fine sweeps), the gold grade in the flotation column mixed concentrate is lower by 5.75g/t, the zinc content is lower by 0.14 percent, the silver content is higher by 19.05g/t, and the copper-lead-sulfur grade is improved to some extent under the condition that the contents of various metals such as gold in the raw ore are equivalent; the gold, silver, copper and zinc in the flotation column concentrate are all improved by more than 10 percent, and the recovery rates of lead and sulfur are all improved by more than 7 percent. The method enhances the efficiency of sorting the gold concentrate from multiple metals, shortens the process and enhances the recovery effect.
B. And (4) separating and floating the gold concentrate bulk concentrate.
5000g/t of lime serving as a pyrite inhibitor, 50g/t of butylammonium black serving as a chalcopyrite collector, 12.5g/t of butyl sodium yellow serving as a chalcopyrite collector and 5g/t of ethyl-sulfur-nitrogen serving as a chalcopyrite collector are sequentially added into a sorting roughing stirring barrel 6, water is added for size mixing to enable the concentration of ore pulp to reach 42% -46%, then the ore pulp is sent to a sorting roughing flotation column 8 through a third feeding pump 7, concentrate of the sorting roughing flotation column 8 flows into a sorting flotation column 9, tailings of the sorting roughing flotation column 8 firstly flow into a sorting scavenging stirring barrel 10, then are fed into a sorting scavenging flotation column 12 through a fourth feeding pump 11, and tailings of the sorting flotation column 9 and concentrate of the sorting scavenging column 12 return to the sorting roughing stirring barrel 6 to form a circular flotation closed circuit; the tailings of the separation scavenging flotation column 12 are used as high-sulfur concentrate, and the concentrate of the separation concentrating flotation column 9 is used as high-copper concentrate to respectively enter the subsequent cyanidation operation.
After the coarse-fine-sweeping flotation operation of the cyclone-static microbubble flotation column, the high-copper concentrate and the high-sulfur concentrate are obtained and respectively enter the subsequent cyanidation operation. The results of the short-flow column flotation system and method for gold concentrate separation and comparison with the conventional full flotation machine system and method are shown in table 2.
Table 2 gold concentrate sorting index results of this example and comparison with conventional methods
* Representing the difference between the results of the flotation column test and the concentrate yield of the production cell.
According to the data in table 2, it can be seen that under the short-flow column type flotation system and method of the present invention, the gold concentrate separation index results are better than those of the conventional full flotation machine system and method, the concentrate grade of each metal in the high copper concentrate separated and floated by the flotation column is better than that of the conventional flotation machine, the recovery rate of each metal in the high copper concentrate is also better than that of the flotation machine, and the grade and the recovery rate of sulfur in the high sulfur concentrate separated and floated by the flotation column are also better than those of the flotation machine. Under the flow of one rough one fine sweep of the flotation column, compared with a full flotation machine production system (the flow is one rough two fine three sweeps), the gold concentrate mixed flotation result improves the gold grade in the high copper concentrate of the flotation column by 74.36g/t, the silver grade by 311.17g/t, the copper lead zinc grade by 1.55, 7.76 and 0.51 percentage points respectively and the separation flotation high sulfur concentrate grade by 0.82 percentage point under the condition that the metal content and the sulfur content of the raw ore are equivalent. The recovery rates of gold, silver, copper, lead and zinc in the flotation column high copper concentrate are respectively improved by 11.39 percent, 16.63 percent, 17.85 percent, 10.14 percent and 16.16 percent, and the recovery rate of sulfur is improved by 2.64 percent. The flotation column is more favorable for separation flotation, and the separation effect of sulfur and metal is obvious. The system and the method of the invention are superior to the system and the method of a flotation machine, thereby not only shortening the flow, but also strengthening the separation effect of sulfur and metal.
Example 3: the invention relates to a short-flow flotation method embodiment (II) of gold concentrate pre-leaching flotation.
In this example, flotation before leaching is performed on gold concentrate with fineness of 74% and with fineness of-400 meshes by coarse grinding, and parameters such as flotation equipment, process and materials are the same as those in example 2.
Through the operation of swirl-static microbubble flotation column one-coarse-one-fine-one-sweep mixed flotation, the average recovery rate of gold in the mixed concentrate is 98.74 percent, the average sulfur grade is 43 percent, the average gold grade in the low-sulfur concentrate is 2.96g/t, and the average sulfur grade is 4.7 percent. The results of the gold concentrate bulk flotation and the comparison thereof with the conventional full flotation machine system method under the condition are shown in table 3.
Table 3 index results of bulk concentration of gold concentrate of this example and comparison thereof with conventional methods
* Representing the difference between the results of the flotation column test and the concentrate yield of the production cell.
As can be seen from table 3, in the short-flow column flotation system and method of the present invention, after the particle size is coarsened, the index of the flotation column is not changed much, the result of the index of the gold concentrate bulk flotation is still better than that of the conventional full flotation machine system and method, most concentrate grades of the flotation column are still better than that of the conventional flotation machine, and the recovery rate of each metal in the concentrate grades is still better than that of the flotation machine. Under the flow of one rough one fine sweep of the flotation column, compared with a full flotation machine production system (the flow is one rough two fine sweeps and three fine sweeps), the gold grade in the flotation column mixed concentrate is lower by 4.64g/t, the zinc content is lower by 0.04 percent, the silver content is higher by 6.01g/t, and the copper-lead-sulfur grade is improved to some extent under the condition that the contents of various metals such as gold in the raw ore are equivalent; the recovery rate of each metal in the concentrate of the flotation column is also improved. After the granularity is reduced, the whole flotation effect of the system and the method is not influenced, the index advantage is obvious, and the method enhances the recovery effect of multiple metals in the gold concentrate.
Because the mixed flotation granularity is coarsened, the separation flotation feed granularity is also coarsened. After the flotation operation of coarse-fine-sweep separation of the cyclone-static microbubble flotation column, the high copper concentrate and the high sulfur concentrate are obtained and respectively enter the subsequent cyanidation operation. The gold concentrate separation results of the short-flow column flotation system and method and the comparison results with the traditional full flotation machine system and method are shown in the table 4.
Table 4 gold concentrate sorting index results of this example and comparison with conventional methods
* Indicating the difference between the results of the flotation column test and the concentrate yield of the production flotation machine.
According to the data in table 4, it can be seen that, in the short-flow column type flotation system and method of the present invention, after the particle size is coarsened, the index change of the flotation column is small, the result of the gold concentrate sorting index is still better than that of the conventional full flotation machine system and method, the concentrate grade of each metal in the high copper concentrate separated and floated by the flotation column is still better than that of the conventional flotation machine, the recovery rate of each metal in the high copper concentrate is still better than that of the flotation machine, and the grade of the high sulfur concentrate separated and floated by the flotation column and the recovery rate of sulfur are also better than that of the flotation machine. Under the flow of one rough one fine sweep of the flotation column, compared with a full flotation machine production system (the flow is one rough two fine three sweeps), the gold concentrate mixed flotation result improves 65.46g/t, the silver grade improves 144.43g/t, the copper lead zinc grade improves 0.79, 4.24 and 0.2 percentage points respectively, and the separation flotation high sulfur concentrate grade improves 0.76 percentage points under the condition that the metal content and the sulfur content of raw ores are equivalent. The recovery rates of gold, silver, copper, lead and zinc in the flotation column high copper concentrate are respectively improved by 4.5 percent, 6.31 percent, 16.39 percent, 12.38 percent and 14.87 percent, and the recovery rate of sulfur is improved by 11.09 percent. The overall flotation effect of the system and the method is not affected after the particle size is coarsened, all indexes are still superior to those of the traditional flotation machine process, and the flotation column is more beneficial to separation flotation. The system and the method of the invention are superior to the system and the method of a flotation machine, thereby not only shortening the flow, but also obtaining better effect on the concentrate grade and the recovery rate.
Claims (8)
1. A gold concentrate pre-leaching short-flow flotation method is characterized by comprising the following steps:
a) Grinding and grading gold concentrate, enabling overflow products to enter a mixed flotation roughing stirring barrel (1), adding a collecting agent into the mixed flotation roughing stirring barrel (1), feeding overflow ore pulp subjected to water adding and pulp mixing into a mixed flotation column (3) through a first feeding pump (2), enabling concentrate of the mixed flotation column (3) to flow into a mixed concentration flotation column (4), and feeding tailings of the mixed concentration flotation column (3) into a mixed concentration scavenging flotation column (15) through a second feeding pump (14); tailings of the mixed selection and concentration flotation column (4) and concentrate of the mixed selection and scavenging flotation column (15) return to the mixed selection and roughing stirring barrel (1) to form a circulation closed loop; the tailings of the mixed-flotation scavenging flotation column (15) are used as low-sulfur concentrate to enter the subsequent cyaniding operation; concentrate of the mixed concentration flotation column (4) enters a separation roughing mixing barrel (6);
b) Adding a pyrite inhibitor and a chalcopyrite collector into a separation roughing stirring barrel (6) in sequence, adding water and mixing pulp, then sending the pulp to a separation roughing flotation column (8) by a third feeding pump (7), enabling the concentrate of the separation roughing flotation column (8) to flow into a separation concentrating flotation column (9), feeding the tailings of the separation roughing flotation column (8) into a separation scavenging flotation column (12) by a fourth feeding pump (11), and returning the tailings of the separation concentrating flotation column (9) and the concentrate of the separation scavenging flotation column (12) to the separation roughing stirring barrel (6) to form a circulation closed circuit; the tailings of the separation scavenging flotation column (12) are used as high-sulfur concentrate, and the concentrate of the separation concentrating flotation column (9) is used as high-copper concentrate to respectively enter the subsequent cyanidation operation.
2. The flotation method for gold concentrate before leaching according to claim 1, wherein the fineness of gold concentrate after grinding and grading in step a) is required: 70 to 95 percent of-400 meshes.
3. The gold concentrate pre-leaching short flow flotation method according to claim 1, characterized in that: collecting agents in the step A) are butyl sodium xanthate and ethidium; in the step A), the adding amount of the collecting agent is 90-130g/t of butyl sodium xanthate and 90-130g/t of ethidium nitrate.
4. The gold concentrate pre-leaching short flow flotation method according to claim 1, characterized in that: in the step B), the pyrite inhibitor is lime, and the addition amount is 4800-5200g/t; in the step B), the chalcopyrite collecting agents are ammonium butyl black, butyl sodium xanthate and ethidium nitrate, and the adding amount of the chalcopyrite collecting agents is 50-60g/t of the ammonium butyl black, 10-15g/t of the butyl sodium xanthate and 5-10g/t of the ethidium nitrate.
5. The gold concentrate pre-leaching short flow flotation method according to any one of claims 1 to 5, characterized in that: the flotation column is a rotational flow-static microbubble flotation column.
6. The short-flow flotation system before gold concentrate leaching comprises a mixed-concentration roughing flotation stirring barrel (1), a mixed-concentration roughing flotation column (3), a mixed-concentration roughing flotation column (4), a mixed-concentration scavenging flotation column (15), a separation roughing stirring barrel (6), a separation roughing flotation column (8), a separation roughing flotation column (9) and a separation scavenging flotation column (12), and is characterized in that: an overflow outlet of the mixed-concentration roughing stirring barrel (1) is connected with a feed inlet of a mixed-concentration roughing flotation column (3) through a pipeline; the concentrate outlet of the mixed concentration and rough concentration flotation column (3) is connected with the feed inlet of the mixed concentration and fine concentration flotation column (4) through a pipeline; a tailing outlet of the mixed-selection rough-selection flotation column (3) is connected with a mixed-selection scavenging stirring barrel (13) through a pipeline, and the mixed-selection scavenging stirring barrel (13) is connected with a feeding hole of a mixed-selection scavenging flotation column (15) through a pipeline; the tailing outlet of the mixed selection and concentration flotation column (4) and the concentrate outlet of the mixed selection and scavenging flotation column (15) are respectively connected with the mixed selection and roughing stirring barrel (1) through pipelines; the concentrate outlet of the mixed concentration flotation column (4) is connected with a separation and distribution barrel (5) through a pipeline, and the separation and distribution barrel (5) is connected with the separation and rough concentration stirring barrel (6) through a pipeline; an overflow outlet of the separation roughing stirring barrel (6) is connected with a feed inlet of the separation roughing flotation column (8) through a pipeline; the concentrate outlet of the separation and roughing flotation column (8) is connected with the feed inlet of the separation and roughing flotation column (9) through a pipeline; a tailing outlet of the separation roughing flotation column (8) is connected with a separation scavenging stirring barrel (10) through a pipeline, and the separation scavenging stirring barrel (10) is connected with a feeding hole of the separation scavenging flotation column (12) through a pipeline; the tailing outlet of the separation and concentration flotation column (9) and the concentrate outlet of the separation and scavenging flotation column (12) are respectively connected with the separation and roughing stirring barrel (6) through pipelines.
7. The gold concentrate pre-leaching short flow flotation system of claim 6, wherein: a first feeding pump (2) is arranged on a pipeline between the mixed-flotation rough-flotation stirring barrel (1) and the mixed-flotation rough-flotation column (3); a second feeding pump (14) is arranged on a pipeline between the mixed selection scavenging stirring barrel (13) and the mixed selection scavenging flotation column (15); a third feeding pump (7) is arranged on a pipeline between the separation roughing stirring barrel (6) and the separation roughing flotation column (8); a fourth feeding pump (11) is arranged on a pipeline between the separation scavenging stirring barrel (10) and the separation scavenging flotation column (12).
8. The gold concentrate pre-leaching short flow flotation system according to claim 6 or 7, wherein: the flotation column is a rotational flow-static microbubble flotation column.
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