Efficient separation and comprehensive recovery system based on copper-nickel complex platinum-palladium concentrate

Abstract

The utility model relates to an efficient separation and comprehensive recovery system based on copper-nickel complex platinum-palladium concentrate. The system comprises a smelting furnace, and an outlet of the smelting furnace is sequentially connected with a 1 # converting furnace, a 2 # converting furnace, a stage temperature control cooling furnace, a grinding system and a low-intensity magnetic field pulse high-gradient magnetic separator; an outlet of the low-intensity magnetic field pulse high-gradient magnetic separator is connected with a normal-pressure acid leaching system and a 2 # filter, an outlet of the normal-pressure acid leaching system is sequentially connected with a 1 # filter and a nickel sulfate crystallization system, and an outlet of the 2 # filter is sequentially connected with a roasting furnace, a copper leaching tank, a 3 # filter and a copper sulfate crystallization system; outlets of the nickel sulfate crystallization system and the 3 # filter are connected with a nickel smelting furnace; and an outlet of the nickel smelting furnace is connected with a nickel electrolysis system. The system can efficiently separate and recover valuable metals such as platinum, palladium, gold, silver, copper, nickel and cobalt in the complex platinum-palladium concentrate, is good in separation effect and high in comprehensive recovery rate, fully realizes comprehensive recycling of resources, and has relatively good economic benefits and social benefits.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the precious metal metallurgy technical field, concretely relates to a kind of high-efficiency separation comprehensive recovery system based on copper nickel complex platinum palladium concentrate. BACKGROUND

[0002] The type platinum palladium concentrate is rich in platinum, palladium, gold, silver, copper, nickel and other valuable metals, and traditional roasting leaching or full wet leaching is used, which produces large amount of slag, complex leaching solution composition, difficult waste liquid treatment, or complex process for recovering precious metals, which is difficult to recover poor copper, nickel and cobalt, or simple process for recovering poor copper, nickel and cobalt, which is difficult to recover main component precious metals, resulting in high production cost, which leads to ineffective comprehensive recovery of resources. Therefore, exploring scientific and reasonable recovery process has become a technical problem to be solved in the industry.

[0003] CN117051252A discloses a method for separating and recovering nickel, copper, cobalt, gold, silver, platinum and palladium from platinum palladium concentrate. The patent uses first smelting and first blowing to obtain high-nickel matte, then uses high-temperature normal pressure and high-pressure kettle for high-temperature high-pressure oxidation acid leaching, and then recovers valuable components by step crystallization and separation. Although platinum and palladium can obtain good recovery index, high-temperature high-pressure leaching leads to complex leaching solution composition, and different components interfere with each other seriously in step crystallization process, which is easy to form mixed crystal, and low-content metal cannot obtain good recovery index. Secondly, the method uses high-pressure equipment to oxidize sulfide at high temperature, which requires high design and material of process equipment, higher capital investment, and higher operation and maintenance level. In addition, the method returns the first blowing slag to the smelting link for processing again, which inevitably increases the smelting material quantity and leads to high smelting cost.

[0004] Based on the existing defects and deficiencies, the utility model aims to provide a kind of high-efficiency separation comprehensive recovery system based on copper nickel complex platinum palladium concentrate, which is scientific and reasonable in process arrangement, simple in equipment and low in production cost. UTILITY MODEL CONTENTS

[0005] The utility model provides a kind of high-efficiency separation comprehensive recovery system based on copper nickel complex platinum palladium concentrate, mainly for complex platinum palladium concentrate with copper:nickel ratio of 1:1.1~2.5, which uses smelting enrichment, two-stage gradient blowing enrichment, stage selective crystallization, crushing-grinding-weak magnetic field pulse high-gradient magnetic separation, roasting-sulfuric acid selective leaching combined normal pressure separation and separation product classification refining in combination, to efficiently recover platinum, palladium, gold, silver, copper, nickel, cobalt and other valuable metals.

[0006] The specific technical scheme is: a high-efficiency separation and comprehensive recovery system based on copper-nickel complex platinum-palladium concentrate, comprising a smelting furnace, the outlet of the smelting furnace is connected with a 1# blowing furnace, a 2# blowing furnace, a stage temperature control cooling furnace, a crushing and grinding system and a weak magnetic field pulse high gradient magnetic separator in sequence; the outlet of the weak magnetic field pulse high gradient magnetic separator is connected with a normal pressure acid leaching system and a 2# filter, the outlet of the normal pressure acid leaching system is connected with a 1# filter and a nickel sulfate crystallization system in sequence, the outlet of the 2# filter is connected with a roasting furnace, a copper leaching tank, a 3# filter and a copper sulfate crystallization system in sequence; the outlets of the nickel sulfate crystallization system and the 3# filter are connected with a nickel smelting furnace, and the outlet of the nickel smelting furnace is connected with a nickel electrolysis system.

[0007] Further, preferably, the crushing and grinding system comprises a crushing and grinding machine and a ball mill.

[0008] Further, preferably, the magnetic induction intensity of the weak magnetic field pulse high gradient magnetic separator is 100-200 mT, and the pulse intensity is 100-180 times / min.

[0009] Further, preferably, the diameter and spacing of the magnetic medium rods in the upper half of the quality box of the weak magnetic field pulse high gradient magnetic separator are 3-5 mm, the diameter and spacing of the magnetic medium rods in the lower half are 4-8 mm, and a mesh sieve net with a mesh size of 1 mm is installed on the first layer of magnetic medium rods in the upper half.

[0010] The utility model discloses a high-efficiency separation and comprehensive recovery system based on copper-nickel complex platinum-palladium concentrate, comprising a smelting furnace, the outlet of the smelting furnace is connected with a 1# blowing furnace, a 2# blowing furnace, a stage temperature control cooling furnace, a crushing and grinding system and a weak magnetic field pulse high gradient magnetic separator in sequence; the outlet of the weak magnetic field pulse high gradient magnetic separator is connected with a normal pressure acid leaching system and a 2# filter, the outlet of the normal pressure acid leaching system is connected with a 1# filter and a nickel sulfate crystallization system in sequence, the outlet of the 2# filter is connected with a roasting furnace, a copper leaching tank, a 3# filter and a copper sulfate crystallization system in sequence; the outlets of the nickel sulfate crystallization system and the 3# filter are connected with a nickel smelting furnace, and the outlet of the nickel smelting furnace is connected with a nickel electrolysis system.

[0011] The main technical effects of the utility model are as follows:

[0012] (1) The utility model skillfully combines smelting, two-stage cascade blowing, and when the first blowing is close to the end, timely transfer to another converter for 1100-1200 DEG C short-time secondary blowing, can obtain bottom liquid containing about 10.00% iron and 22-25% sulfur, effectively improve the iron and sulfur content in the liquid, make more iron exist in the form of alloy gold, is favorable to improve the subsequent alloy gold yield, take into account the precious metal enrichment ratio and recovery rate, reduce the content of dispersed precious metal in the slag, fully ensure the recovery of valuable components in the liquid, and enhance the differentiation efficiency. At the same time, avoid the formation of iron sulfide and over-fine mineral crystals (less than 0.01 grain), provide favorable conditions for the next step of separation, and also can greatly reduce the amount of returned iron oxide slag, reduce the smelting production cost.

[0013] (2) The utility model combines stage cooling with smelting and two-stage cascade blowing, through synergistic effect, forms single crystal coarse, simple structure and large particle mineral combination with differentiation structure, effectively avoids or reduces the formation of mixed melting crystals and over-fine mineral crystals (less than 0.01 grain), facilitates the fracture along the grain boundary in the crushing and grinding process, and provides sufficient separation conditions for the subsequent process.

[0014] (3) The utility model skillfully applies weak magnetic field pulse high gradient magnetic separation to the separation of alloy gold and sulfide ore, greatly improves the separation efficiency, avoids the technical defect that flaky coarse-grained alloy gold produced in the grinding process is easy to block the magnetic medium box, and simplifies the process flow.

[0015] (4) For the mixed ore with differentiation structure, the utility model skillfully adopts grinding-pulse high gradient magnetic separation and roasting-sulfuric acid selective leaching for separation, under the condition of suitable grinding fineness, improves the precious metal recovery rate and the separation effect of the attached valuable components, simplifies the process flow, effectively avoids the defects that high temperature and high pressure oxidation leaching requires high equipment and materials, high energy consumption, high reagent consumption, high operation level and infrastructure requirements, and large industrial production control difficulty. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is a device association diagram of a high-efficiency separation and comprehensive recovery system based on copper-nickel complex platinum-palladium concentrate;

[0017] In the figure: 1-smelting furnace, 2-1# blowing furnace, 3-2# blowing furnace, 4-stage temperature control cooling furnace, 5-crushing and grinding system, 6-weak magnetic field pulse high gradient magnetic separator, 7-normal pressure acid leaching system, 8-1# filter, 9-nickel sulfate crystallization system, 10-2# filter, 11-roasting furnace, 12-copper leaching tank, 13-3# filter, 14-copper sulfate crystallization system, 15-nickel smelting furnace, 16-nickel electrolysis system. DETAILED DESCRIPTION

[0018] In order to make the technical problems and technical solutions solved by the utility model clearer and more apparent, the utility model will be further described in detail below in combination with the drawings and examples. It should be understood that the specific examples described herein are only used to explain the utility model and are not used to limit the utility model.

[0019] In the description of the utility model, it should be understood that the orientation or position relationship indicated by the terms "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like is based on the orientation or position relationship shown in the drawings and is only used to facilitate the description of the utility model and is not used to indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the utility model.

[0020] In the description of the utility model, it should be understood that, unless otherwise explicitly specified and limited, the terms "arrangement", "installation", "connection" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integral connection, it can be mechanical connection, or electrical connection, it can be direct connection, or indirect connection through intermediate medium, it can be the communication inside two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to specific circumstances.

[0021] As shown in Figure 1 A kind of high-efficiency separation comprehensive recovery system based on copper-nickel complex platinum-palladium concentrate, including smelting furnace 1, the outlet of the smelting furnace 1 is sequentially connected 1# blowing furnace 2, 2# blowing furnace 3, stage temperature control cooling furnace 4, grinding system 5 and weak magnetic field pulse high gradient magnetic separator 6;Weak magnetic field pulse high gradient magnetic separator 6 is connected with atmospheric acid leaching system 7 and 2# filter 10, the outlet of the atmospheric acid leaching system 7 is sequentially connected with 1# filter 8 and nickel sulfate crystallization system 9, 2# filter 10 outlet is sequentially connected with calcination furnace 11, copper leaching tank 12, 3# filter 13 and copper sulfate crystallization system 14;The outlet of the nickel sulfate crystallization system 9 and 3# filter 13 is connected with nickel smelting furnace 15, and the outlet of the nickel smelting furnace 15 is connected with nickel electrolysis system 16.

[0022] The above grinding system 5 includes a grinding mill and a ball mill;The magnetic induction intensity of weak magnetic field pulse high gradient magnetic separator 6 is 100-200mT, the pulse intensity is 100-180 times / min, the diameter and spacing of the magnetic medium rod in the upper half of the quality box are 3-5mm, the diameter and spacing of the magnetic medium rod in the lower half are 4-8mm, and a sieve screen with a mesh size of 1mm is installed on the first layer of magnetic medium rods in the upper part.

[0023] It should be noted that the above devices are all existing devices, and the present application only relates to the application of these existing devices, and does not relate to the improvement of the structure thereof.

[0024] When the above system is used for recovery of complex platinum-palladium concentrate, the specific working principle is as follows:

[0025] The platinum-palladium concentrate to be treated is mixed with a slagging agent and coal powder and is put into a smelting furnace 1 for smelting, so as to obtain low-grade matte, slag and sulfur dioxide flue gas.

[0026] The obtained low-grade matte is transferred into a 1# converter blowing furnace 2 after being mixed with silica and lump coal, and is subjected to primary converter blowing. When the primary blowing is close to the end point, the low-grade matte is transferred into a 2# converter blowing furnace 3 in time for secondary blowing for a short time, so as to obtain high-grade matte liquid with a bottom-sinking iron content of about 10% and a sulfur content of 22% to 25%, oxidized iron slag (cyclic use) and sulfur dioxide flue gas.

[0027] The obtained high-grade matte liquid with a bottom-sinking is transferred into a stage temperature control cooling furnace 4 in time for selective crystallization, so as to obtain a large-particle mineral combined matte mineral (including eutectic gold, cuprous sulfide and nickel sulfide) with a differentiation structure.

[0028] The matte mineral with a differentiation structure is transferred into a crushing and grinding system 5 for crushing and fine grinding. When the fine grinding fineness is 50% to 65% of -0.074 mm, the mineral is transferred into a weak magnetic field pulse high gradient magnetic separator 6 for separation, so as to obtain eutectic gold (platinum-palladium gold copper nickel iron) and copper-nickel mixed concentrate.

[0029] The eutectic gold (platinum-palladium gold copper nickel iron) is transferred into an atmospheric acid leaching system 7, sulfuric acid is added and is subjected to acid leaching after being heated, the acid leaching slag is filtered through a 1# filter 8, and the eutectic gold (platinum-palladium gold copper) is obtained. Air is continuously supplied to the atmospheric acid leaching system, nickel carbonate is further added for iron removal, and oxidized iron sediment is obtained. The mother liquor after being filtered and washed by the 1# filter 8 is transferred into a nickel sulfate crystallization system 9, is subjected to nickel sulfate crystallization, and nickel sulfate crystals and nickel sulfate crystallization mother liquor (cyclic utilization) are obtained.

[0030] The filter residue obtained after the copper-nickel mixed concentrate slurry is filtered through a 2# filter 10 is transferred into a roasting furnace 11 for roasting, the roasting slag is further transferred into a copper leaching tank 12 for acid leaching, and oxidized nickel (filter residue) is obtained after the acid leaching is filtered through a 3# filter 13. The mother liquor after being filtered and washed is transferred into a copper sulfate crystallization system 14 for crystallization, and copper sulfate crystals and crystallization mother liquor (cyclic utilization) are obtained.

[0031] Finally, the obtained nickel sulfate crystals and oxidized nickel are mixed and are transferred into a nickel smelting furnace 15 for smelting, so as to obtain nickel anode plates with a main component of crude nickel. The nickel anode plates are transferred into a nickel electrolysis system 16 for electrolysis, and cathode nickel, anode mud and silver cobalt slag products are obtained.

[0032] Application Example 1:

[0033] Raw material 1# : a kind of based on copper nickel complex platinum palladium concentrate, main elements and content are as follows: platinum 26.68 g / t, palladium 36.89 g / t, gold 5 g / t, silver 15 g / t, copper 2.34%, nickel 2.50%, cobalt 0.70%, iron 18.26%, sulfur 14.62%, magnesium 11.29%.

[0034] As Figure 1 Indicated, using the system of the utility model is implemented to the complex platinum palladium concentrate, the specific treatment process is as follows:

[0035] (1) smelting enrichment: the platinum palladium concentrate to be treated is mixed with slagging agent (one or two of limestone, silicon dioxide and ferric oxide can be selected) and coal powder and is put into smelting furnace 1 to smelt, low-grade matte, slag and sulfur dioxide flue gas are obtained. In this process, the smelting temperature is 1400 DEG C, the amount of smelting slagging agent is 8% of the weight of platinum palladium concentrate, 20% of the weight of platinum palladium concentrate for silicon dioxide, and 7.5% of the weight of platinum palladium concentrate for ferric oxide.

[0036] (2) two-stage gradient blowing enrichment: the low-grade matte obtained in step (1) is mixed with silicon dioxide and lump coal and is transferred into 1# converter 2 to perform primary converter blowing, when the primary blowing is close to the end point, it is timely transferred into 2# converter 3 to continue secondary blowing for a short time, high-grade matte liquid with iron content of about 10%, sulfur content of 22% to 25% and oxidized iron slag (recycled) and sulfur dioxide flue gas are obtained. In this process, the primary converter blowing temperature is 1280 DEG C, and the amount of silicon dioxide for primary converter blowing is 23% of the weight of smelting product; the secondary converter blowing temperature is 1180 DEG C.

[0037] (3) stage selective crystallization: the high-grade matte liquid obtained in step (2) is timely transported to stage temperature control cooling furnace 4 to perform selective crystallization, and large particle mineral combined matte mineral (including eutectic gold, cuprous sulfide and nickel sulfide) with differentiation structure is obtained. The specific process of stage temperature control cooling is as follows: 1180 DEG C is reduced to 580 DEG C, the slow cooling time is 1 day, 580 DEG C is reduced to 520 DEG C, the slow cooling time is 4 days, 520 DEG C is reduced to 370 DEG C, the slow cooling time is 1 day, and then natural cooling can be performed.

[0038] (4) Mixed ore separation: the differentiated structure of the matte obtained in step (3) is transported to the crushing and grinding system 5 for crushing and fine grinding, and when the fine grinding fineness is 50% to 65% of -0.074 mm, the mineral is transferred to the weak magnetic field pulse high gradient magnetic separator 6 for separation to obtain the combined gold (platinum-palladium gold copper-nickel iron) and copper-nickel mixed concentrate. In this process, the fine grinding fineness is 50% to 65% of -0.074 mm, the magnetic separation concentration is 20% to 25%, the magnetic induction intensity of the weak magnetic field pulse high gradient magnetic separator (improved type) is 100 to 200 mT, the magnetic medium diameter and working gap are 3 to 5 mm, and the pulse intensity is 100 to 180 times / min;

[0039] (5) Selective separation of combined gold: the combined gold obtained in step (4) is transferred to the atmospheric acid leaching system 7, sulfuric acid is added for heating acid leaching, and the acid leaching residue is filtered by the 1# filter 8 to obtain the combined gold (platinum-palladium gold copper); air is continuously charged to the atmospheric acid leaching system, nickel carbonate is further added for iron removal, and iron oxide residue is obtained; the mother liquor after filtration and washing by the 1# filter 8 is then introduced into the nickel sulfate crystallization system 9, and nickel sulfate is crystallized to obtain nickel sulfate crystals and nickel sulfate crystallization mother liquor (recycled). In this process, the pH of the heated acid leaching is 1 to 2, the leaching temperature is 65 to 85°C, the liquid-solid ratio is 1:1 to 4:1, and the leaching time is 2 to 3 hours; iron removal is achieved by slowly adjusting the pH of nickel carbonate to 3.0 to 4.7.

[0040] (6) Copper-nickel mixed concentrate separation: the filter residue obtained by filtering the copper-nickel mixed concentrate slurry obtained in step (4) by the 2# filter 10 is then introduced into the roasting furnace 11 for roasting, and the roasted residue is further transferred into the copper leaching tank 12 for acid leaching, and then filtered by the 3# filter 13 to obtain nickel oxide (filter residue), and the mother liquor after filtration and washing is introduced into the copper sulfate crystallization system 14 to crystallize copper sulfate and crystallization mother liquor (recycled). In this process, the roasting temperature is 750 to 850°C, the liquid-solid ratio is 2:1 to 5:1, the acid leaching pH is 1 to 3, and the leaching temperature is 65 to 85°C.

[0041] (7) The nickel sulfate crystals obtained in step (5) and the nickel oxide obtained in step (6) are mixed and sent to the nickel smelting furnace 15 for smelting to obtain nickel anode plates with main components of crude nickel, and then the nickel anode plates are sent to the nickel electrolysis system 16 for electrolysis to obtain cathode nickel, anode mud and silver cobalt residue products.

[0042] The test results are as follows: the platinum-palladium comprehensive recovery rate is 96.17%, the gold-silver comprehensive recovery rate is 94.88%, the copper recovery rate is 90.67%, the nickel recovery rate is 90.25%, and the cobalt recovery rate is 70.45%.

[0043] Application Example 2:

[0044] Raw material 2# is a copper-nickel based complex platinum-palladium concentrate, and the main elements and contents are as follows: platinum 37.45 g / t, palladium 47.48 g / t, gold 7 g / t, silver 17 g / t, copper 2.08%, nickel 2.40%, cobalt 0.50%, iron 16.75%, sulfur 12.67%, and magnesium 8.27%.

[0045] The raw material 2# is treated by the treatment process described in application example 1, and the test results are as follows: the comprehensive recovery rate of platinum and palladium is 96.48%, the comprehensive recovery rate of gold and silver is 94.79%, the recovery rate of copper is 89.00%, the recovery rate of nickel is 88.75%, and the recovery rate of cobalt is 68.87%.

[0046] Application example 3:

[0047] Raw material 3# is a copper-nickel based complex platinum-palladium concentrate, and the main elements and contents are as follows: platinum 30.65 g / t, palladium 80.92 g / t, gold 6 g / t, silver 16 g / t, copper 2.25%, nickel 2.15%, cobalt 0.74%, iron 16.84%, sulfur 15.15%, and magnesium 10.66%.

[0048] The raw material 3# is treated by the treatment process described in application example 1, and the test results are as follows: the comprehensive recovery rate of platinum and palladium is 97.53%, the comprehensive recovery rate of gold and silver is 95.29%, the recovery rate of copper is 90.00%, the recovery rate of nickel is 89.00%, and the recovery rate of cobalt is 69.08%.

[0049] In summary, the system described in the present application is used to treat such complex platinum-palladium concentrates, and the copper:nickel ratio is 1:1.1-2.5, the comprehensive recovery rate of platinum and palladium is more than 96%, the comprehensive recovery rate of gold and silver is about 95%, the recovery rate of copper is about 90%, the recovery rate of nickel is about 89%, and the recovery rate of cobalt is about 69%. It can be seen that the system can efficiently separate and recover valuable metals in complex platinum-palladium concentrates, fully realizes resource comprehensive recovery and utilization, and has good economic and social benefits.

[0050] The present application has been described in detail through specific and preferred embodiments, but those skilled in the art should understand that the present application is not limited to the above-described embodiments, and any modifications, equivalent replacements, etc. made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A highly efficient separation and integrated recovery system based on complex copper-nickel platinum-palladium concentrates, characterized in that: The system includes a smelting furnace (1), the outlet of which is connected in sequence to a No. 1 blowing furnace (2), a No. 2 blowing furnace (3), a stage temperature-controlled cooling furnace (4), a grinding system (5), and a weak magnetic field pulse high gradient magnetic separator (6); the outlet of the weak magnetic field pulse high gradient magnetic separator (6) is connected to an atmospheric pressure acid leaching system (7) and a No. 2 filter (10); the outlet of the atmospheric pressure acid leaching system (7) is connected in sequence to a No. 1 filter (8) and a nickel sulfate crystallization system (9); the outlet of the No. 2 filter (10) is connected in sequence to a roasting furnace (11), a copper leaching tank (12), a No. 3 filter (13), and a copper sulfate crystallization system (14); the outlets of the nickel sulfate crystallization system (9) and the No. 3 filter (13) are connected to a nickel smelting furnace (15); and the outlet of the nickel smelting furnace (15) is connected to a nickel electrolysis system (16).

2. The efficient separation and integrated recovery system based on complex copper-nickel platinum-palladium concentrate according to claim 1, characterized in that: The grinding system (5) includes a grinding mill and a ball mill.

3. The efficient separation and comprehensive recovery system based on complex copper-nickel platinum-palladium concentrate according to claim 1, characterized in that: The magnetic induction intensity of the weak magnetic field pulse high gradient magnetic separator (6) is 100-200 mT and the pulse intensity is 100-180 times / min.

4. The efficient separation and integrated recovery system based on complex copper-nickel platinum-palladium concentrate according to claim 3, characterized in that: The weak magnetic field pulse high gradient magnetic separator (6) has a magnetic medium rod diameter and spacing of 3-5 mm in the upper half of the material box, a magnetic medium rod diameter and spacing of 4-8 mm in the lower half of the material box, and a grid screen with a sieve hole of 1 mm is installed on the upper first layer of magnetic medium rods.

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