A method for extracting nickel and cobalt from laterite nickel ore

Abstract

The application provides a method for extracting nickel and cobalt from laterite nickel ore, and relates to the field of non-ferrous metallurgy. The method for extracting nickel and cobalt from laterite nickel ore comprises the following steps: mixing the laterite nickel ore after crushing treatment with a chlorinating agent and an additive, performing a chlorination reaction, and generating flue gas; and passing the flue gas into an absorption liquid to obtain a nickel and cobalt-rich chloride solution. The method can make the nickel and cobalt chlorides volatilize in a vapor state, separate from gangue, and after absorption, obtain a nickel and cobalt-rich chloride solution. Subsequently, after precipitation separation, a nickel and cobalt hydroxide product can be obtained; due to the fluxing effect of calcium fluoride and the destruction of silicate structures, nickel and cobalt can be fully exposed, the reaction selectivity and efficiency are significantly improved, the nickel and cobalt recovery rate is high, and compared with the traditional pyrometallurgical process, the drying and granulation processes are omitted. The process method has the advantages of short process flow, simple operation, small pollution, low energy consumption, high nickel and cobalt extraction efficiency, and has practical significance and good application prospect.

Description

Technical Field

[0001] This application relates to the field of non-ferrous metal metallurgy, and more particularly to a method for extracting nickel and cobalt from laterite nickel ore. Background Technology

[0002] Nickel possesses excellent thermal and electrical conductivity, corrosion resistance, oxidation resistance, and high-temperature resistance, making it an important strategic metal. As the largest producer and consumer of primary nickel, my country has a huge demand for nickel in fields such as stainless steel, batteries, and high-end manufacturing. Nickel primarily originates from sulfide nickel ores and laterite nickel ores. With sulfide nickel ores facing mining difficulties, declining grades, and rapidly decreasing reserves, laterite nickel ores, with their lower mining costs, convenient transportation, and abundant reserves, have become a focus of current research. Researchers have developed pyrometallurgical, hydrometallurgical, and other processes to extract and utilize laterite nickel ore resources.

[0003] Among them, ferronickel smelted by pyrometallurgical processes can be directly used in stainless steel production. Pyrometallurgical processes have advantages such as mature technology, short process, and high efficiency. However, the smelting of laterite nickel ore produces a large amount of slag, and the smelting temperature required for the slag is high. To ensure the separation of molten iron and slag, the slag temperature generally needs to be maintained above 1550℃, or even exceeding 1600℃. This results in high energy consumption and the inability to recover cobalt, only producing ferronickel alloys or nickel matte. The high-priced nickel-cobalt hydroxide product can only be obtained through hydrometallurgical processes. Hydrometallurgical processes mainly include atmospheric pressure acid leaching, pressurized acid leaching, and reduction roasting-ammonia leaching, which have the advantage of high recovery rates. However, hydrometallurgical processes are complex, have long process flows, require high-end equipment and operators, and suffer from problems such as difficult disposal of leaching slag and rapid increase in leaching slag accumulation leading to serious environmental pollution.

[0004] Patent document CN202310114337.4 discloses a method for extracting nickel and cobalt from laterite nickel ore by chlorination and volatilization. This method requires the laterite nickel ore to be roasted for 1-4 hours at a temperature of 700-900℃, and then mixed with chlorinating agent and additives before being roasted a second time. The process is relatively lengthy, resulting in some loss of energy and efficiency.

[0005] Existing technologies for refining laterite nickel ore suffer from drawbacks such as high production costs, demanding process conditions, complex and lengthy procedures, and low metal recovery rates, failing to achieve efficient extraction of nickel and cobalt and comprehensive utilization of resources. Summary of the Invention

[0006] The purpose of this application is to provide a method for extracting nickel and cobalt from laterite nickel ore to solve the above-mentioned problems.

[0007] To achieve the above objectives, this application adopts the following technical solution: A method for extracting nickel and cobalt from laterite nickel ore includes: The crushed laterite nickel ore is mixed with chlorinating agent and additives to carry out a chlorination reaction and produce flue gas. The flue gas is passed into an absorbent to obtain a nickel-cobalt rich solution.

[0008] According to embodiments of this application, the additives include calcium fluoride, silicon dioxide, and coal powder.

[0009] According to an embodiment of this application, the mass of the calcium fluoride is 5% to 20% of the mass of the laterite nickel ore; The mass of the silica is 12% to 20% of the mass of the laterite nickel ore; The mass of the pulverized coal is 1% to 10% of the mass of the laterite nickel ore.

[0010] According to embodiments of this application, the chlorinating agent includes calcium chloride.

[0011] According to an embodiment of this application, the mass of the chlorinating agent is 15%-30% of the mass of the laterite nickel ore.

[0012] According to an embodiment of this application, the particle size of the crushed laterite nickel ore is 30µm-150µm.

[0013] According to an embodiment of this application, the chlorination reaction is carried out at a temperature of 1200°C-1300°C.

[0014] According to the embodiments of this application, the chlorination reaction time is 30 min to 180 min.

[0015] According to an embodiment of this application, the absorbent liquid comprises water.

[0016] According to embodiments of this application, the chlorination reaction is carried out in any one of a rotary kiln, rotary hearth furnace, blast furnace, fluidized bed furnace, or electric furnace.

[0017] Compared with the prior art, the beneficial effects of this application include: This application describes a method for extracting nickel and cobalt from laterite nickel ore. By using high-temperature chlorination roasting, nickel and cobalt chlorides are volatilized and separated from the gangue. After absorption, a nickel-cobalt-rich solution is obtained. Subsequent precipitation separation yields the nickel-cobalt hydroxide product. This method boasts advantages such as a short process, simple operation, low pollution, low energy consumption, and high nickel-cobalt extraction efficiency, demonstrating practical significance and promising application prospects.

[0018] Specifically, during the drying process of traditional pyrometallurgical processes, the mineral structure of laterite nickel ore changes at high temperatures, causing nickel and cobalt to be encapsulated and difficult to chlorinate. This application can directly use crushed laterite nickel ore for chlorination, saving the drying and granulation steps compared to traditional pyrometallurgical processes, shortening the process and reducing energy consumption; moreover, during the reaction process, the additives and chlorinating agents contact the laterite nickel ore in a molten state, resulting in high reactant contact efficiency and a significant improvement in the nickel-cobalt chlorination rate. Attached Figure Description

[0019] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly described below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation on the scope of this application.

[0020] Figure 1 This is a flowchart illustrating the method for extracting nickel and cobalt from laterite nickel ore in this application. Detailed Implementation

[0021] As used in this article: "Prepared from" is synonymous with "comprising". The terms "comprising", "including", "having", "containing", or any other variations thereof as used herein are intended to cover non-exclusive inclusion. For example, a composition, step, method, article, or apparatus that includes the listed elements is not necessarily limited to those elements, but may include other elements not expressly listed or elements inherent to such composition, step, method, article, or apparatus.

[0022] The conjunction "composed of..." excludes any unspecified elements, steps, or components. If used in a claim, this phrase makes the claim closed, excluding materials other than those described, except for associated conventional impurities. When the phrase "composed of..." appears in a clause of the body of a claim rather than immediately following it, it limits only the elements described in that clause; other elements are not excluded from the claim as a whole.

[0023] When a quantity, concentration, or other value or parameter is expressed as a range, a preferred range, or a range defined by a series of upper and lower preferred values, this should be understood as specifically disclosing all ranges formed by any pair of any upper or preferred value with any lower or preferred value, regardless of whether the range is disclosed individually. For example, when the range “1–5” is disclosed, the described range should be interpreted as including ranges “1–4”, “1–3”, “1–2”, “1–2 and 4–5”, “1–3 and 5”, etc. When numerical ranges are described herein, unless otherwise stated, the range is intended to include its endpoints and all integers and fractions within that range.

[0024] In these embodiments, unless otherwise specified, the portions and percentages are all by weight.

[0025] "Parts by mass" refers to the basic unit of measurement that expresses the mass ratio of multiple components. One part can represent any unit mass, such as 1g or 2.689g. If we say that component A has "a" parts by mass and component B has "b" parts by mass, it means the ratio of the mass of component A to the mass of component B is a:b. Alternatively, it can mean that the mass of component A is aK and the mass of component B is bK (where K is any number representing a multiplier). It is important to understand that, unlike parts by mass, the sum of the mass parts of all components is not limited to 100 parts.

[0026] "And / or" is used to indicate that one or both of the described situations may occur, for example, A and / or B includes (A and B) and (A or B).

[0027] A method for extracting nickel and cobalt from laterite nickel ore, referenced Figure 1 ,include: The crushed laterite nickel ore is mixed with chlorinating agent and additives to carry out a chlorination reaction and produce flue gas. The flue gas is passed into an absorbent to obtain a nickel-cobalt rich solution.

[0028] In some embodiments, the laterite nickel ore is a limonite-type laterite nickel ore with a high magnesium content. For example, the Mg content in the laterite nickel ore is 0.55 wt%.

[0029] According to embodiments of this application, the additives include calcium fluoride, silicon dioxide, and coal powder.

[0030] CaCl2, as a chlorinating agent, can decompose to produce HCl at high temperatures, providing a chlorine source for the chlorination reaction. Furthermore, CaCl2 is inexpensive and readily available, making it suitable for high-temperature chlorination and volatilization processes. The main reactions involved are: CaCl2(s) + H2O(g) = 2HCl(g) + CaO(s) The addition of SiO2 can further promote the decomposition reaction of CaCl2. CaCl2 has a melting point of 772℃, and liquid CaCl2 easily penetrates deep into the pore structure of minerals, increasing the probability of reaction with nickel and cobalt, and enhancing chlorination efficiency. The main reactions that occur are as follows: SiO2(s) + CaCl2(l) + H2O(g) = 2HCl(g) + CaSiO3(s) Adding too little SiO2 will hinder the decomposition of CaCl2, making it difficult to provide a sufficient chlorine source. As a result, even after nickel cobalt chloride is generated, it will hydrolyze back into oxides due to the low HCl atmosphere. Adding too much SiO2 will cause nickel cobalt to be coated by silicate substances such as CaSiO3 and MgSiO3, which will hinder the volatilization of chlorides or even make it difficult for chlorination to occur.

[0031] The addition of CaF2 can effectively disrupt the silicate crystal structure of nickel- and cobalt-containing minerals, while also enhancing the interaction between internal particles, causing them to agglomerate into larger particles, which is more conducive to chlorination.

[0032] The addition of pulverized coal provides a reducing atmosphere, effectively preventing the hydrolysis of nickel-cobalt chloride and ensuring a high volatilization rate. However, excessive pulverized coal addition leads to an increased slag ratio, which is detrimental to the volatilization of nickel-cobalt chloride.

[0033] According to an embodiment of this application, the mass of the calcium fluoride is 5% to 20% of the mass of the laterite nickel ore; For example, the mass of calcium fluoride can be any value between 5%, 6%, 7%, 8%, 9%, 10%, 11%, 12%, 13%, 14%, 15%, 16%, 17%, 18%, 19%, 20% or 5% to 20% of the mass of laterite nickel ore. The mass of the silica is 12% to 20% of the mass of the laterite nickel ore; For example, the mass of silica can be any value between 12%, 13%, 14%, 15%, 16%, 17%, 18%, 19%, 20%, or 12% to 20% of the mass of laterite nickel ore.

[0034] The mass of the pulverized coal is 1% to 10% of the mass of the laterite nickel ore.

[0035] For example, the mass of pulverized coal can be any value between 1%, 2%, 3%, 4%, 5%, 6%, 7%, 8%, 9%, 10% or 1% to 10% of the mass of laterite nickel ore.

[0036] According to embodiments of this application, the chlorinating agent includes calcium chloride.

[0037] According to an embodiment of this application, the mass of the chlorinating agent is 15%-30% of the mass of the laterite nickel ore.

[0038] For example, the mass of the chlorinating agent can be any value between 15%, 17%, 20%, 22%, 25%, 27%, 30% or 15%-30% of the mass of laterite nickel ore.

[0039] According to an embodiment of this application, the particle size of the crushed laterite nickel ore is 30µm-150µm.

[0040] For example, the particle size of laterite nickel ore after crushing can be any value between 30µm, 40µm, 50µm, 60µm, 70µm, 80µm, 90µm, 100µm, 110µm, 120µm, 130µm, 140µm, 150µm, or 30µm-150µm.

[0041] According to an embodiment of this application, the chlorination reaction is carried out at a temperature of 1200°C-1300°C.

[0042] For example, the temperature of the chlorination reaction can be 1200℃, 1300℃, or any value between 1200℃ and 1300℃.

[0043] According to the embodiments of this application, the chlorination reaction time is 30 min to 180 min.

[0044] For example, the chlorination reaction time can be any value between 30 min, 60 min, 80 min, 100 min, 120 min, 140 min, 160 min, 180 min, or 30 min - 180 min.

[0045] The main reactions that occur in laterite nickel ore during the chlorination process are as follows: NiO(s) + SiO2(s) + CaCl2(l) = NiCl2(g) + CaSiO3(s) CoO(s) + SiO2(s) + CaCl2(l) = CoCl2(g) + CaSiO3(s) According to an embodiment of this application, the absorbent liquid comprises water.

[0046] In some embodiments, before obtaining the nickel-cobalt-rich solution, the method further includes: subjecting the flue gas to multi-stage washing, concentration, and filtration.

[0047] After the chlorination reaction, the nickel and cobalt in the laterite nickel ore volatilize in the form of gaseous chlorides. After repeated washing and absorption with water, and then concentration and filtration, a solution rich in nickel and cobalt can be obtained.

[0048] According to embodiments of this application, the chlorination reaction is carried out in any one of a rotary kiln, rotary hearth furnace, blast furnace, fluidized bed furnace, or electric furnace.

[0049] In some embodiments, the chlorination reaction also yields tail gas and slag; after the flue gas is passed into the absorbent, a nickel-cobalt rich solution and tail gas are obtained.

[0050] The method further includes: recovering heat from the exhaust gas, removing dust, removing arsenic and desulfurizing it before discharging it, and granulating the slag.

[0051] The implementation schemes of this application will be described in detail below with reference to specific embodiments. However, those skilled in the art will understand that the following embodiments are only for illustrating this application and should not be regarded as limiting the scope of this application. Unless otherwise specified in the embodiments, conventional conditions or conditions recommended by the manufacturer shall apply. Reagents or instruments used without specified manufacturers are all conventional products that can be purchased commercially.

[0052] Example 1 Example 1 provides a method for extracting nickel and cobalt from laterite nickel ore, specifically including the following steps: The composition of laterite nickel ore includes 0.97% Ni, 0.058% Co, 46.81% Fe, 0.81% Cr, and 0.55% Mg (by weight).

[0053] Lateritic nickel ore was crushed and dried, and sieved to 74µm. The sieved lateritic nickel ore was weighed, and calcium fluoride, silicon dioxide, coal powder, and calcium chloride were added. Among them, the mass of calcium fluoride accounted for 15% of the mass of lateritic nickel ore, the mass of silicon dioxide accounted for 16% of the mass of lateritic nickel ore, the mass of coal powder accounted for 1% of the mass of lateritic nickel ore, and the mass of calcium chloride accounted for 30% of the mass of lateritic nickel ore. After being mixed evenly, a chlorination reaction was carried out at 1200℃ for 2 hours, so that nickel and cobalt volatilized in the form of gaseous chlorides. The volatilized flue gas was absorbed by water to obtain a nickel-cobalt rich solution.

[0054] The content of Ni, Co, and Fe in minerals after chlorination volatilization is determined, and the chlorination volatilization efficiency of metallic Ni, Co, and Fe is calculated using the following formula:

[0055] In the formula, α represents the metal chlorination volatilization rate (%); x represents the metal element content in the raw material before chlorination roasting (%); m represents the mass of the raw material before chlorination roasting (g); y represents the metal element content in the mineral after chlorination volatilization (%); and n represents the mass of the mineral after chlorination roasting (g). During the experiment, the Ni volatilization rate was used as the main indicator to evaluate the feasibility of the scheme, while simultaneously maximizing the volatilization rate of the associated element Co and suppressing the volatilization of the impurity element Fe.

[0056] Volatilization rate: Nickel 85.85%, Cobalt 82.79%, Iron 1.70%.

[0057] Example 2 Example 2 provides a method for extracting nickel and cobalt from laterite nickel ore. Other steps and parameters are the same as in Example 1, except that the amount of silica added is different from that in Example 1. In Example 2, the mass of silica accounts for 12% of the mass of laterite nickel ore.

[0058] Volatilization rate: Nickel 84.66%, Cobalt 80.76%, Iron 3.10%.

[0059] Example 3 Example 3 provides a method for extracting nickel and cobalt from laterite nickel ore. Other steps and parameters are the same as in Example 1, except that the amount of coal powder added is different from that in Example 1. In Example 3, the mass of coal powder accounts for 10% of the mass of laterite nickel ore.

[0060] Volatilization rate: Nickel 81.99%, Cobalt 74.51%, Iron 2.47%.

[0061] Example 4 Example 4 provides a method for extracting nickel and cobalt from laterite nickel ore. Other steps and parameters are the same as in Example 1, except that the amount of calcium fluoride and silicon dioxide added is different from that in Example 1. In Example 4, the mass of calcium fluoride accounts for 5% of the mass of laterite nickel ore, and the mass of silicon dioxide accounts for 20% of the mass of laterite nickel ore.

[0062] Volatilization rate: Nickel 80.58%, Cobalt 73.26%, Iron 7.76%.

[0063] Example 5 Example 5 provides a method for extracting nickel and cobalt from laterite nickel ore. Other steps and parameters are the same as in Example 1, except that the amount of calcium fluoride added is different from that in Example 1. In Example 5, the mass of calcium fluoride accounts for 20% of the mass of laterite nickel ore.

[0064] Volatilization rate: Nickel 80.92%, Cobalt 77.90%, Iron 0.46%.

[0065] Example 6 Example 6 provides a method for extracting nickel and cobalt from laterite nickel ore. The other steps and parameters are the same as in Example 1, except that the chlorination reaction temperature is different. The chlorination reaction in Example 6 is carried out at a temperature of 1300°C.

[0066] Volatilization rate: Nickel 85.08%, Cobalt 81.23%, Iron 1.83%.

[0067] Comparative Example 1 Comparative Example 1 provides a method for extracting nickel and cobalt from laterite nickel ore. Other steps and parameters are the same as in Example 1, except that calcium fluoride is not added in Comparative Example 1.

[0068] Volatilization rate: Nickel 66.93%, Cobalt 77.47%, Iron 9.57%.

[0069] Comparative Example 2 Comparative Example 2 provides a method for extracting nickel and cobalt from laterite nickel ore. Other steps and parameters are the same as in Example 1, except that the chlorination reaction temperature is different. The chlorination reaction in Comparative Example 2 is carried out at a temperature of 1400°C.

[0070] Volatilization rate: Nickel 51.55%, Cobalt 46.52%, Iron 7.89%.

[0071] Comparative Example 3 Comparative Example 3 provides a method for extracting nickel and cobalt from laterite nickel ore. Other steps and parameters are the same as in Example 1, except that the chlorination reaction time is different. In Comparative Example 3, the chlorination reaction time is 10 min.

[0072] Volatilization rate: Nickel 28.27%, Cobalt 41.24%, Iron 0.35%.

[0073] Comparative Example 4 Comparative Example 4 provides a method for extracting nickel and cobalt from laterite nickel ore. Other steps and parameters are the same as in Example 1, except that calcium chloride is not added in Comparative Example 4, and magnesium chloride hexahydrate is added as a chlorinating agent. The mass of magnesium chloride hexahydrate accounts for 30% of the mass of laterite nickel ore.

[0074] Volatilization rate: Nickel 3.06%, Cobalt 18.42%, Iron 1.37%.

[0075] Comparative Example 5 Comparative Example 5 provides a method for extracting nickel and cobalt from laterite nickel ore. Other steps and parameters are the same as in Example 1, except that calcium chloride is not added in Comparative Example 5, and sodium chloride is added as a chlorinating agent. The mass of sodium chloride accounts for 30% of the mass of laterite nickel ore.

[0076] Volatilization rate: Nickel 41.94%, Cobalt 34.33%, Iron 3.18%.

[0077] Comparative Example 6 Comparative Example 6 provides a method for extracting nickel and cobalt from laterite nickel ore. Other steps and parameters are the same as in Example 1, except that the amount of calcium chloride added is different. In Comparative Example 6, the mass of calcium chloride accounts for 10% of the mass of laterite nickel ore.

[0078] Volatilization rate: Nickel 39.88%, Cobalt 37.43%, Iron 1.49%.

[0079] Comparative Example 7 Comparative Example 7 provides a method for extracting nickel and cobalt from laterite nickel ore. Other steps and parameters are the same as in Example 1, except that the amount of silica added is different. In Comparative Example 7, the mass of silica accounts for 8% of the mass of laterite nickel ore.

[0080] Volatilization rate: Nickel 41.86%, Cobalt 27.21%, Iron 3.46%.

[0081] Comparative Example 8 Comparative Example 8 provides a method for extracting nickel and cobalt from laterite nickel ore. Other steps and parameters are the same as in Example 1, except that the amount of coal powder added is different. In Comparative Example 8, the mass of coal powder accounts for 20% of the mass of laterite nickel ore.

[0082] Volatilization rate: Nickel 38.16%, Cobalt 29.13%, Iron 2.84%.

[0083] Comparative Example 9 Comparative Example 9 was conducted using the method described in patent document CN202310114337.4. The mineral composition used in Comparative Example 9 was the same as that in Example 1.

[0084] Lateritic nickel ore was crushed and dried, and sieved to 74µm. The sieved lateritic nickel ore was weighed and pre-roasted at 900℃ for 2h. No calcium fluoride was added, only silica, coal powder and calcium chloride were added. The mass of silica accounted for 16% of the mass of lateritic nickel ore, the mass of coal powder accounted for 1% of the mass of lateritic nickel ore, and the mass of calcium chloride accounted for 30% of the mass of lateritic nickel ore. After being mixed evenly, a chlorination reaction was carried out at 1200℃ for 2h, so that nickel and cobalt volatilized in the form of gaseous chlorides. The volatilized flue gas was absorbed by water to obtain a nickel-cobalt rich solution.

[0085] Volatilization rate: Nickel 62.22%, Cobalt 58.34%, Iron 6.83%.

[0086] As demonstrated in Example 1 and Comparative Example 9, the method described in patent CN202310114337.4 is ineffective in processing lateritic nickel ore with high magnesium content, particularly limonite-type ore. The method described in this application is applicable to lateritic nickel ore with high magnesium content. When the magnesium content is high, high-temperature roasting of lateritic nickel ore with the addition of silica produces magnesium silicates, which encapsulate nickel and cobalt, making chlorination difficult. Adding calcium fluoride lowers the melting point while exposing the magnesium silicate-encapsulated nickel and cobalt, promoting chlorination volatilization.

[0087] As can be seen from the above embodiments and comparative examples, the method of this application can simultaneously achieve high nickel volatilization rate, high cobalt volatilization rate, and low iron volatilization rate. Specifically, in this application, the nickel volatilization rate can reach over 80%, the cobalt volatilization rate can reach over 73%, and the iron volatilization rate can be suppressed to below 7.8%. Furthermore, the method of this application also has advantages such as short process, low energy consumption, simple operation, and environmental friendliness.

[0088] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

[0089] Furthermore, those skilled in the art will understand that although some embodiments herein include certain features included in other embodiments but not others, combinations of features from different embodiments are intended to be within the scope of this application and form different embodiments. For example, in the foregoing claims, any of the claimed embodiments can be used in any combination. The information disclosed in this background section is intended only to enhance the understanding of the general background of this application and should not be construed as an admission or in any way implying that such information constitutes prior art known to those skilled in the art.

Claims

1. A method for extracting nickel and cobalt from laterite nickel ore, characterized in that, include: The crushed laterite nickel ore is mixed with chlorinating agent and additives to carry out a chlorination reaction and produce flue gas. The flue gas is passed into an absorbent to obtain a nickel-cobalt rich solution; The additives include calcium fluoride, silicon dioxide, and coal powder; The mass of the calcium fluoride is 5% to 20% of the mass of the laterite nickel ore; The mass of the silica is 12% to 20% of the mass of the laterite nickel ore; The mass of the pulverized coal is 1% to 10% of the mass of the laterite nickel ore; The chlorinating agent includes calcium chloride; The mass of the chlorinating agent is 15%-30% of the mass of the laterite nickel ore.

2. The method for extracting nickel and cobalt from laterite nickel ore according to claim 1, characterized in that, The particle size of the laterite nickel ore after crushing is 30µm-150µm.

3. The method for extracting nickel and cobalt from laterite nickel ore according to claim 1, characterized in that, The chlorination reaction is carried out at a temperature of 1200℃-1300℃.

4. The method for extracting nickel and cobalt from laterite nickel ore according to claim 3, characterized in that, The chlorination reaction takes 30-180 minutes.

5. The method for extracting nickel and cobalt from laterite nickel ore according to claim 1, characterized in that, The absorbent includes water.

6. The method for extracting nickel and cobalt from laterite nickel ore according to any one of claims 1-5, characterized in that, The chlorination reaction is carried out in any one of the following: rotary kiln, rotary hearth furnace, blast furnace, fluidized bed furnace, and electric furnace.

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