CN109439892B - Method for extracting valuable metals from copper-nickel sulfide minerals - Google Patents
Method for extracting valuable metals from copper-nickel sulfide minerals Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B1/00—Preliminary treatment of ores or scrap
- C22B1/02—Roasting processes
- C22B1/08—Chloridising roasting
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B11/00—Obtaining noble metals
- C22B11/04—Obtaining noble metals by wet processes
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B15/00—Obtaining copper
- C22B15/0063—Hydrometallurgy
- C22B15/0065—Leaching or slurrying
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B23/00—Obtaining nickel or cobalt
- C22B23/04—Obtaining nickel or cobalt by wet processes
- C22B23/0407—Leaching processes
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B3/00—Extraction of metal compounds from ores or concentrates by wet processes
- C22B3/04—Extraction of metal compounds from ores or concentrates by wet processes by leaching
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Abstract
The invention relates to a method for extracting valuable metals from copper-nickel sulfide minerals, which belongs to the field of nonferrous metallurgy and comprises the following steps: grinding the copper-nickel sulfide mineral, uniformly mixing the ground copper-nickel sulfide mineral with a chlorinating agent according to a certain mass ratio, placing the mixture in a closed vertical furnace, and carrying out primary roasting or secondary roasting in an oxidizing atmosphere. And (3) condensing ammonia gas, hydrogen chloride, chlorine gas and the like generated by sublimation and reaction of gold, silver and platinum group metal chlorides in the roasting process, and then recovering and enriching the condensed ammonia gas, hydrogen chloride, chlorine gas and the like. Leaching the roasted clinker by deionized water, and filtering to obtain a solution containing valuable metal chlorides such as copper, nickel, cobalt and the like, wherein the extraction rate of copper, nickel and cobalt is more than 80%. The content of iron ions in the secondary roasting leachate is less than 0.4 mol/L. The method realizes the comprehensive extraction of valuable metals such as copper, nickel, cobalt and the like at a lower temperature, has high recovery rate, can control the extraction rate of impurity iron through selective roasting, realizes the enrichment of gold, silver and platinum group metals, and has simple process and low energy consumption.
Description
The technical field is as follows:
the invention belongs to the technical field of nonferrous metallurgy, and particularly relates to a method for extracting valuable metals from copper-nickel sulfide minerals through chloridizing roasting-water leaching, and particularly relates to a method for extracting valuable metals from copper-nickel sulfide minerals.
Background art:
the world land-based nickel resource mainly comprises two types of weathered laterite-nickel ore and magma type copper-nickel sulfide ore. The quality of the sulfide nickel ore resources is good, and the process technology is mature, so the sulfide nickel ore is a main resource for producing nickel products. In recent years, with the increasing demand of nickel in the world, the resource of the mineable high-grade nickel sulfide ore is increasingly exhausted, and the low-grade nickel-copper sulfide ore becomes a key development object of the nickel industry under the condition of no new mineral resource support.
The low-grade copper nickel sulphide ore is a thicker mixed ore zone between a lean ore body and an upper oxidation zone of a primary sulphide ore, and is associated with a large amount of copper metal. The alkaline gangue of the mineral has high content and complex mineral phase structure, and the prior nickel sulfide ore smelting process is adopted for treatment, so that the defects of high energy consumption, low recovery rate of valuable metals, poor economic benefit and the like exist. Therefore, there is an urgent need to develop a new method and technology for extracting metals from copper nickel sulfide ore.
Aiming at the mineral separation technology of low-grade nickel sulfide ores in Jinchuan, Xinjiang, Yunnan and other areas, a large number of scholars improve the mineral separation recovery rate, increase the concentrate grade and improve the recovery rate of metals from the aspects of researching new medicaments, introducing new processes and new equipment, but because of the complexity of the composition and the structure of the low-grade nickel sulfide ores, the loss of the metals such as nickel, copper, cobalt and the like in the mineral separation process is still the biggest problem to be overcome when the mineral separation process is applied.
In the aspect of pyrometallurgy, from the aspects of energy conservation and yield improvement, USSR researches that low-grade nickel sulfide ore is oxidized and then reacts with C and CaC1 at 900 DEG C2Or MgC12The recovery rates of Ni, Cu and Fe are 82.5%, 73.8% and 6.1% respectively. The problems of low metal recovery rate and high energy consumption restrict the development and application of the technology to a certain extent.
In the aspect of hydrometallurgy, a mixed acid system of nitric acid and sulfuric acid, an ammonia-ammonium salt system and a method for biologically leaching low-grade copper nickel sulfide ore to extract metals are mainly researched, the recovery rate of the metals in the acid leaching and biological leaching processes is high, however, the content of alkaline gangue is high, so that the acid consumption is high, and the cost is high; the ammonia leaching process has low metal recovery rate and low efficiency.
The invention content is as follows:
the invention aims to overcome the defects in the prior art, and provides a method for extracting valuable metals from copper-nickel sulfide minerals under the condition that the existing process flow is difficult to effectively treat low-grade copper-nickel sulfide minerals and other process flows are not successfully applied in industry, so that the valuable metals in the copper-nickel sulfide minerals can be efficiently recovered and comprehensively utilized.
In order to achieve the purpose, the invention adopts the following technical scheme:
a method for extracting valuable metals from copper-nickel sulfide minerals comprises the following steps:
step 1, mixing materials:
crushing and grinding copper-nickel sulfide type minerals to form mineral powder, and then uniformly mixing the mineral powder with a chlorinating agent, wherein the granularity of the mineral powder is less than 380 mu m, and the chlorinating agent is mixed with the mineral powder according to the mass ratio of (0.1-4) to 1;
step 2, roasting:
roasting the uniformly mixed material to generate a roasted material, and cooling to obtain a roasted clinker, wherein the roasting temperature is 100-950 ℃, the roasting time is 0.5-4 hours, and the roasting atmosphere contains 1-50% of oxygen;
and 3, leaching:
mixing the roasted clinker with water according to a solid-liquid ratio (solid mass to liquid volume ratio, unit is g: ml) of 1 (2-10), stirring, leaching, filtering to obtain a leaching solution and filter residues, and finishing extraction, wherein the leaching temperature is 60-100 ℃, and the leaching time is 0.5-4 h.
In the step 1, the copper-nickel sulfide type minerals are copper-nickel sulfide type nickel ores or copper-nickel sulfide type nickel concentrate ores.
In the step (1), the copper-nickel sulfide mineral comprises main metals and mass percentages of the main metals, wherein Ni is less than or equal to 15%, Cu is less than or equal to 10%, Co is 0-2%, TFe is 10-50%, MgO is less than or equal to 40%, S10-40%, and SiO2Less than or equal to 20 percent and the rest of trace Al2O3CaO, etc., the total amount is less than or equal to 15 percent.
In the step (1), the chlorinating agent is a mixture of sodium chloride and magnesium chloride, ammonium chloride or ferric chloride hexahydrate (FeCl)3·6H2O).
In the step (1), when the chlorinating agent is ammonium chloride, the chlorinating agent and the mineral powder are mixed according to the mass ratio of (0.5-4) to 1; when the chlorinating agent is ferric chloride hexahydrate, mixing the chlorinating agent and the mineral powder according to the mass ratio of (0.1-4) to 1; when the chlorinating agent is a mixture of sodium chloride and magnesium chloride, the chlorinating agent and the mineral powder are mixed according to the mass ratio of (0.1-4) to 1, and the mass percentage of the magnesium chloride in the mixture is 1-100%.
In the step 2, when the chlorinating agent in the uniformly mixed material is ammonium chloride, the roasting temperature is 300-600 ℃, and the roasting time is 0.5-4 h;
when the chlorinating agent in the uniformly mixed material is ferric chloride hexahydrate, the roasting temperature is 100-300 ℃, and the roasting time is 0.5-4 h;
when the chlorinating agent in the uniformly mixed material is a mixture of sodium chloride and magnesium chloride, the roasting temperature is 300-950 ℃, and the roasting time is 0.5-4 h.
And 2, roasting the uniformly mixed materials after the uniformly mixed materials are prepared into balls or directly roasting, wherein the roasting operation is carried out in a closed vertical furnace, the lower end of the vertical furnace is connected with a tail gas recovery device, and the upper end of the vertical furnace is connected with a gas introducing device.
In the step 2, in the roasting process:
elements such as copper, nickel, cobalt, magnesium, iron and the like in the copper-nickel sulfide type minerals are converted into soluble metal chlorides, and noble metal elements such as gold, silver, platinum group metals and the like in the copper-nickel sulfide type minerals form corresponding noble metal chlorides to generate gases such as ammonia gas, hydrogen chloride, chlorine gas and the like; realizing the comprehensive extraction of valuable metals such as copper, nickel and cobalt.
In the step 2, in the roasting process:
the generated noble metal chloride is condensed with ammonia gas, hydrogen chloride, chlorine gas and the like by a tail gas recovery device and then is enriched and recovered.
In the step 2, the cooling mode is furnace cooling.
In the step 2, roasting clinker obtained by roasting by using ammonium chloride or ferric chloride hexahydrate as a chlorinating agent is roasted for the second time to obtain a secondary roasting material, the secondary roasting material is cooled along with a furnace to obtain secondary roasting clinker, and then the leaching operation of the step 3 is carried out, specifically: and (3) mixing the secondary roasting clinker with water according to a solid-to-liquid ratio, and continuing subsequent operation, wherein the secondary roasting temperature is 300-600 ℃, the secondary roasting time is 0.5-4 h, and the secondary roasting atmosphere is an atmosphere containing 10-50% of oxygen.
In the step 2, in the secondary roasting process, the iron chloride in the roasted clinker is converted into iron oxide, and the conversion rate is more than 90%.
In the step 3, the leachate is chloride solution containing metals such as copper, nickel, magnesium, cobalt, iron and the like, and sulfate solution possibly containing iron, magnesium and sodium is selected according to a chlorinating agent.
In the step 3, after leaching is completed, the extraction rates of nickel, copper and cobalt are all higher than 80%, and the content of iron ions in the leaching solution is lower than 0.4 mol/L.
In the step 3, ammonium chloride is used as a chlorinating agent, and the leaching is carried out after primary roasting or secondary roasting, wherein the extraction rate of nickel and copper is more than 90%, and the extraction rate of cobalt is more than 85%; ferric chloride hexahydrate is used as a chlorinating agent, and is leached after primary roasting or secondary roasting, the extraction rate of nickel is more than 90%, and the extraction rates of copper and cobalt are more than 80%; the mixture of sodium chloride and magnesium chloride is used as a chlorinating agent, and is leached after primary roasting, and the extraction rate of copper, nickel and cobalt is more than 80%.
In the method, ammonium chloride or ferric chloride hexahydrate is used as a chlorinating agent, and is subjected to primary roasting and re-leaching to obtain leachate and filter residue, wherein the content of iron ions in the leachate is more than 0.4mol/L, and the leachate and the filter residue are subjected to secondary roasting and re-leaching to obtain the leachate and the filter residue, wherein the content of iron ions in the leachate is less than 0.4 mol/L; the method comprises the steps of roasting a mixture of sodium chloride and magnesium chloride serving as a chlorinating agent for one time, and leaching to obtain a leaching solution and filter residues, wherein the content of iron ions in the leaching solution is less than 0.2 mol/L.
Ammonium chloride is used as a chlorinating agent for primary roasting, and the roasting processes are subjected to chemical reactions (1) to (12) shown in the table 1.
TABLE 1 chemical reactions taking place during the calcination of ammonium chloride
Ferric chloride hexahydrate is used as a chlorinating agent to carry out primary roasting, and the metal minerals undergo chemical reactions (13) to (21) shown in Table 2 and chemical reactions (7) to (12) shown in Table 1 in the roasting process.
TABLE 2 chemical reactions taking place during calcination of ferric chloride hexahydrate
The mixture of sodium chloride and magnesium chloride is used as a chlorinating agent to carry out primary roasting, and the metal minerals undergo chemical reactions (24) to (29) shown in Table 3, chemical reactions (19) to (23) shown in Table 2 and chemical reactions (7) to (12) shown in Table 1 in the roasting process.
TABLE 3 chemical reactions taking place during the calcination of mixtures of sodium chloride and magnesium chloride
The main chemical reaction equation generated in the secondary roasting process is as follows:
FeCl3+O2(g)＝Fe2O3+Cl2(g) (30)
Fe2(SO4)＝Fe2O3+3SO3(g) (31)
the invention has the beneficial effects that:
the invention has low roasting temperature and low energy consumption; the extraction rate of copper, nickel and cobalt is high, and the comprehensive recovery and utilization of valuable metals can be realized; the impurity iron is converted into ferric oxide by controlling the roasting temperature and atmosphere, so that the impurity iron is separated from copper, nickel, cobalt and magnesium in advance, and the cost of purifying and removing valuable metals in subsequent solution is reduced; gases such as ammonia gas, hydrogen chloride and the like generated in the chlorination process can be recycled after condensation and recovery; the gold, silver, platinum group metal and other noble metal elements in the mineral powder can be condensed and recovered for enrichment through sublimation. The process has strong applicability and wide application range, and the ore raw materials are not limited by regions, ore positions, grades and the like.
Description of the drawings:
FIG. 1 is a process flow of chloridizing roasting-leaching extraction of valuable metals from copper-nickel sulfide minerals in example 1 of the invention.
The specific implementation mode is as follows:
the present invention will be described in further detail with reference to examples.
Example 1
A process flow diagram of the method for extracting valuable metals from copper-nickel sulfide minerals is shown in figure 1, and the method comprises the following steps:
1) crushing, grinding and screening the copper-nickel sulfide type nickel ore to obtain mineral powder with the granularity of 75-80 mu m, wherein the chemical composition of the copper-nickel sulfide type nickel ore is shown in Table 4.
Table 4 main metallic element composition and mass percentage of copper-nickel sulfide type nickel ore
2) Weighing 20g of nickel ore powder and ammonium chloride, and grinding and mixing uniformly according to the mass ratio of 1:2.
3) And putting the mixed material into a ceramic crucible, covering the ceramic crucible, putting the ceramic crucible into a vertical furnace containing 20% of oxygen, heating to 500 ℃ at the speed of 15 ℃/min, keeping the temperature for 2.5 hours, completing roasting, and cooling along with the furnace to obtain the roasted clinker.
4) And placing the roasted clinker in a vertical furnace containing 40% of oxygen, roasting for 2 hours at the temperature of 450 ℃, and cooling along with the furnace to obtain secondary roasted clinker.
5) Mixing the secondary roasting clinker with deionized water according to a solid-to-liquid ratio of 1:6, mechanically stirring and leaching at 80 ℃ for 40min, and filtering to obtain leaching solution containing nickel, copper, iron and magnesium chlorides and filter residue.
6) And (3) measuring the contents of nickel, copper and iron in the leachate, and calculating to obtain that the extraction rate of nickel is 93.5 percent, the extraction rate of copper is 95.7 percent, and the concentration of iron in the leachate is 0.024 mol/L.
7) Sublimating the noble metal chloride generated by roasting in the steps 3) and 4), condensing the noble metal chloride with ammonia gas, hydrogen chloride, chlorine gas and the like by a tail gas recovery device, and enriching and recovering.
Example 2
A method for extracting valuable metals from copper-nickel sulfide minerals comprises the following steps:
1) the copper-nickel sulfide type nickel concentrate is crushed, ground and sieved to obtain mineral powder with the granularity of 80-96 mu m, and the chemical composition of the copper-nickel sulfide type nickel concentrate is shown in Table 5.
TABLE 5 composition of main metal elements and their mass percentages of copper-nickel sulfide type nickel concentrate
2) 20g of nickel concentrate ore powder and ammonium chloride are weighed and ground and mixed uniformly according to the mass ratio of 1: 2.5.
3) And putting the mixed material into a ceramic crucible, covering, placing into a vertical furnace containing 25% of oxygen, heating to 500 ℃ at the speed of 15 ℃/min, keeping the temperature for 3 hours, completing roasting, and cooling along with the furnace to obtain the roasted clinker.
4) And placing the roasted clinker in a vertical furnace containing 30% of oxygen, roasting for 1.5h at the temperature of 500 ℃, and cooling along with the furnace to obtain secondary roasted clinker.
5) Mixing the secondary roasting clinker with deionized water according to a solid-to-liquid ratio of 1:5, mechanically stirring and leaching at 90 ℃ for 40min, and filtering to obtain leachate containing nickel, copper, cobalt, iron and magnesium chlorides and filter residue.
6) And (3) measuring the contents of nickel, copper, cobalt and iron in the leachate, and calculating to obtain that the extraction rate of nickel is 92.4%, the extraction rate of copper is 93.8%, the extraction rate of cobalt is 89.9%, and the concentration of iron in the leachate is 0.036 mol/L.
7) Sublimating the noble metal chloride generated by roasting in the steps 3) and 4), condensing the noble metal chloride with ammonia gas, hydrogen chloride, chlorine gas and the like by a tail gas recovery device, and enriching and recovering.
Example 3
A method for extracting valuable metals from copper-nickel sulfide minerals comprises the following steps:
1) crushing, grinding and screening the copper-nickel sulfide type nickel ore to obtain mineral powder with the granularity of 109-.
TABLE 6 composition of main metal elements and mass percentage content of copper-nickel sulfide type nickel ore
2) Weighing 10g of nickel ore powder, and grinding and uniformly mixing the nickel ore powder with ferric chloride hexahydrate according to the mass ratio of 1: 1.5.
3) And putting the mixed material into a ceramic crucible, covering the ceramic crucible, putting the ceramic crucible into a vertical furnace containing 20% of oxygen, heating to 180 ℃ at the speed of 10 ℃/min, keeping the temperature for 2.5 hours, completing roasting, and cooling along with the furnace to obtain the roasted clinker.
4) And placing the roasted clinker in a vertical furnace containing 30% of oxygen, roasting for 1h at the temperature of 500 ℃, and cooling along with the furnace to obtain secondary roasted clinker.
5) Mixing the secondary roasting clinker with deionized water according to a solid-to-liquid ratio of 1:5, mechanically stirring and leaching at 90 ℃ for 60min, and filtering to obtain leaching solution containing nickel, copper, iron and magnesium chlorides and filter residue.
6) And (3) measuring the contents of nickel, copper and iron in the leachate, and calculating to obtain that the extraction rate of nickel is 94.9 percent, the extraction rate of copper is 87.3 percent, and the concentration of iron in the leachate is 0.23 mol/L.
7) And 3) sublimating the noble metal chloride generated by roasting in the step 4), condensing by a tail gas recovery device, and enriching and recovering.
Example 4
A method for extracting valuable metals from copper-nickel sulfide minerals comprises the following steps:
1) the copper-nickel sulfide type nickel concentrate is crushed, ground and sieved to obtain mineral powder with the particle size of 120-150 mu m, and the chemical composition of the copper-nickel sulfide type nickel concentrate is shown in Table 7.
TABLE 7 composition of main metal elements and their mass percentages of copper-nickel sulfide type nickel concentrate
2) Weighing 10g of nickel concentrate ore powder, and grinding and uniformly mixing the nickel concentrate ore powder with a mixture of sodium chloride and magnesium chloride according to a mass ratio of 1:2.4, wherein the mass percentage of the magnesium chloride in the mixed chlorinating agent is 70%.
3) And putting the mixed material into a ceramic crucible, covering the ceramic crucible, putting the ceramic crucible into a vertical furnace containing 30% of oxygen, heating to 850 ℃ at the speed of 15 ℃/min, keeping the temperature for 1.5h, completing roasting, and cooling along with the furnace to obtain the roasted clinker.
4) Mixing the roasted clinker with deionized water according to a solid-to-liquid ratio of 1:10, mechanically stirring and leaching at 80 ℃ for 40min, and filtering to obtain a mixed leaching solution containing nickel, copper, cobalt, iron, magnesium, sodium chloride, sodium and magnesium sulfate and filter residue.
5) And (3) measuring the contents of nickel, copper, cobalt and iron in the leachate, and calculating to obtain that the extraction rate of nickel is 83.6 percent, the extraction rate of copper is 81.3 percent, the extraction rate of cobalt is 82.4 percent, and the concentration of iron in the leachate is 0.017 mol/L.
6) And 3) sublimating the precious metal chloride generated by roasting, condensing by a tail gas recovery device, and enriching and recovering.
Claims (4)
1. A method for extracting valuable metals from copper-nickel sulfide minerals is characterized by comprising the following steps:
step 1, mixing materials:
crushing and grinding copper-nickel sulfide type minerals to form mineral powder, and uniformly mixing the mineral powder with a chlorinating agent, wherein the granularity of the mineral powder is less than 380 mu m, the chlorinating agent is mixed with the mineral powder according to a mass ratio of (0.1-4): 1, and the chlorinating agent is ammonium chloride or ferric chloride hexahydrate (FeCl)3∙6H2O), wherein:
when the chlorinating agent is ammonium chloride, mixing the chlorinating agent with the mineral powder according to the mass ratio of (0.5-4) to 1; when the chlorinating agent is ferric chloride hexahydrate, mixing the chlorinating agent and the mineral powder according to the mass ratio of (0.1-4) to 1;
the copper-nickel sulfide mineral is copper-nickel sulfide nickel ore or copper-nickel sulfide nickel concentrate, and comprises the following components in percentage by mass, not more than 9.58% of Ni, not more than 6.83% of Cu, 0-0.2% of Co, 10-45.54% of TFe, not more than 10.13% of MgO, 10-30.6% of S, and SiO2Less than or equal to 14 percent and the balance of Al2O3And CaO, the total amount is less than or equal to 15 percent;
step 2, roasting:
one of the following two ways is adopted:
mode (one), primary firing: roasting the uniformly mixed material to generate a primary roasted material, cooling to obtain primary roasted clinker, and performing the step 3; wherein the primary roasting temperature is 180-500 ℃, the heating rate is 10-15 ℃/min, the roasting time is 0.5-3 h, and the primary roasting atmosphere contains 20-25% of oxygen;
in the second mode, the second baking is performed on the basis of the first baking:
carrying out secondary roasting on the primary roasting clinker to obtain a secondary roasting material, cooling the secondary roasting material along with a furnace to obtain a secondary roasting clinker, and then carrying out the leaching operation in the step 3, wherein the secondary roasting temperature is 450-500 ℃, the roasting time is 1-2 h, the secondary roasting atmosphere contains 30-40% of oxygen, and in the secondary roasting process, iron chloride in the roasting clinker is converted into iron oxide, and the conversion rate is more than 90%;
and 3, leaching:
mixing the primary/secondary roasting clinker with water according to a solid-to-liquid ratio of 1 (2-10), stirring, leaching, filtering to obtain a leaching solution and a filter residue, and finishing extraction, wherein the solid-to-liquid ratio is a solid mass to liquid volume ratio, the unit is g: ml, the leaching temperature is 60-100 ℃, and the leaching time is 0.5-4 hours;
through detection: roasting for the first time, leaching again to obtain a leachate and filter residue, wherein the iron ion content in the leachate is more than 0.4mol/L, roasting for the second time, leaching again to obtain the leachate and filter residue, and the iron ion content in the leachate is less than 0.4 mol/L;
ammonium chloride is used as a chlorinating agent, and the leaching is carried out after primary roasting or secondary roasting, wherein the extraction rate of nickel and copper is more than 90%, and the extraction rate of cobalt is more than 85%; when the secondary roasting is carried out, the extraction rate of nickel is 92.4-93.5%, and the extraction rate of copper is 93.8-95.7%;
ferric chloride hexahydrate is used as a chlorinating agent, and is leached after primary roasting or secondary roasting, the extraction rate of nickel is more than 90%, and the extraction rates of copper and cobalt are more than 80%; in the case of the secondary calcination, the extraction rate of nickel was 94.9%, and the extraction rate of copper was 87.3%.
2. The method for extracting valuable metals from copper-nickel sulfide type minerals, according to claim 1, is characterized in that in the step 2, when a chlorinating agent in the uniformly mixed material is ammonium chloride, the primary roasting temperature is 500 ℃; when the chlorinating agent in the uniformly mixed material is ferric chloride hexahydrate, the primary roasting temperature is 180 ℃.
3. The method for extracting valuable metals from copper-nickel sulfide type minerals according to claim 1, wherein in the step 2, the uniformly mixed materials are roasted after being made into balls or directly roasted, the roasting operation is carried out in a closed vertical furnace, the lower end of the vertical furnace is connected with a tail gas recovery device, and the upper end of the vertical furnace is connected with a gas introduction device.
4. The method for extracting valuable metals from copper-nickel sulfide type minerals as claimed in claim 3, wherein in the step 2, during the roasting process: copper, nickel, cobalt, magnesium and iron elements in the copper-nickel sulfurized minerals are converted into soluble metal chlorides, and gold, silver and platinum group metal noble metal elements in the copper-nickel sulfurized minerals form corresponding noble metal chlorides to generate ammonia gas, hydrogen chloride and chlorine gas; the comprehensive extraction of the valuable metals of copper, nickel and cobalt is realized, and specifically, the generated noble metal chloride is sublimated, condensed with ammonia gas, hydrogen chloride and chlorine gas by a tail gas recovery device, and then enriched and recovered.
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| US3981963A (en) * | 1975-01-22 | 1976-09-21 | Kenneth Leslie Agnew | Iron chloride activated oxidation of sulfide ores |
| CN101798633A (en) * | 2010-03-24 | 2010-08-11 | 东北大学 | Method for treating limonite type oxidized nickel ore by roasting and leaching |
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| CN106086487A (en) * | 2016-08-24 | 2016-11-09 | 北京矿冶研究总院 | Method for smelting molybdenum-nickel-iron alloy by desulfurizing, dearsenizing and calcining low-grade molybdenum-nickel ore |
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2019
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| US3981963A (en) * | 1975-01-22 | 1976-09-21 | Kenneth Leslie Agnew | Iron chloride activated oxidation of sulfide ores |
| CN101798633A (en) * | 2010-03-24 | 2010-08-11 | 东北大学 | Method for treating limonite type oxidized nickel ore by roasting and leaching |
| CN103966460A (en) * | 2013-02-01 | 2014-08-06 | 中国科学院广州地球化学研究所 | Roasting leaching treatment process for recovery of metal rubidium resources from copper sulfur tailings |
| CN103789534A (en) * | 2014-02-18 | 2014-05-14 | 云龙县铂翠贵金属科技有限公司 | Method for enriching noble metals from high-sulfur material |
| CN106086487A (en) * | 2016-08-24 | 2016-11-09 | 北京矿冶研究总院 | Method for smelting molybdenum-nickel-iron alloy by desulfurizing, dearsenizing and calcining low-grade molybdenum-nickel ore |
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