A method for extracting and recovering scandium from laterite nickel ore

Abstract

This invention relates to the field of transition metal extraction and separation technology, and discloses a method for extracting and recovering scandium from laterite nickel ore. The method includes the steps of: dissolving a secondary amine extractant in an organic solvent to form an organic phase, and mixing it with a scandium-containing laterite nickel ore leaching solution to obtain a scandium-containing organic phase. The secondary amine extractant has the following structure: R1 and R2 are independent C1-C9 straight-chain alkyl or branched-chain alkyl groups, and n and m are natural numbers from 1 to 6. This invention uses a secondary amine as the scandium extractant. This method has the advantages of low acid and alkali consumption, no need for acid or alkali treatment, high scandium selectivity, and can effectively avoid emulsification or three-phase formation in the extraction system. The extracted organic phase is easy to back-extract and regenerate; back-extraction can be achieved using weak acids or weak alkalis; and the extraction conditions are easy to control. It is economical, environmentally friendly, and highly efficient.

Description

Technical Field

[0001] This invention relates to the field of transition metal extraction and separation technology, specifically to a method for extracting and recovering scandium from laterite nickel ore. Background Technology

[0002] Scandium, due to its unique physicochemical properties, has attracted much attention and has been widely used in various fields, such as aerospace, nuclear energy, and medicine. Lateritic nickel ore is an important nickel ore resource, and its development and utilization are of great significance for promoting energy transition, reducing fossil fuel consumption, and lowering carbon emissions. A certain amount of scandium is associated with lateritic nickel ore; therefore, the recovery and utilization of this associated scandium during its development and utilization provides valuable support for promoting sustainable development. Solvent extraction is the most commonly used method in industry for recovering scandium from scandium-bearing leachates of lateritic nickel ore.

[0003] CN116024443A discloses a method for the extraction and recovery of scandium, using extractants P204, P227, and trioctyl tertiary amine as extractants to extract and recover scandium from red mud leachate. However, this method requires the use of strong acid (9 mol / L hydrochloric acid) for the washing process and strong alkali (3 mol / L NaOH) for the back-extraction process, resulting in large acid and alkali consumption. Furthermore, the formation of a third phase after alkali back-extraction complicates production operations.

[0004] CN115094229A discloses a method for the comprehensive recovery of scandium and nickel-cobalt from laterite nickel ore. It uses a 10% P204-kerosene solution for extraction, with an extraction rate of 99.8% for Sc. However, it requires a 5-stage washing and 10-stage back-extraction process to obtain scandium back-extraction solution, which is a relatively long process.

[0005] CN104862503A discloses a method for extracting scandium from laterite nickel ore, using 8% Cyanex 272 and 3% TBP as extractants, achieving a scandium extraction rate of 99.5%, but still requiring back-extraction with 6 mol / L hydrochloric acid, resulting in high acid consumption.

[0006] In addition, the literature (Liu Caiyun, Fu Jiangang. Experimental study on extraction and recovery of scandium from tungsten slag [J]. Rare Metals & Hard Alloys, 2015, 43(05):4-8+11.) also reported that the basic extractant primary amine N1923 was used to extract and recover scandium from the leaching solution of tungsten slag containing scandium, and the scandium extraction rate reached 96.42%. However, back-extraction with 3.5 mol / L hydrochloric acid was required, and the acid concentration was still relatively high. Summary of the Invention

[0007] This invention addresses the problems of high acid and alkali consumption and easy formation of emulsions or third phases during scandium extraction by providing a method for extracting and recovering scandium from laterite nickel ore. This method has low acid and alkali consumption, is less prone to emulsification and third phase formation, has a high scandium extraction rate, and is easy to back-extract.

[0008] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0009] A method for extracting and recovering scandium from lateritic nickel ore includes the steps of: dissolving a secondary amine extractant in an organic solvent to form an organic phase, and mixing and extracting it with a scandium-containing lateritic nickel ore leachate to obtain a scandium-containing organic phase; the structure of the secondary amine extractant is as follows:

[0010]

[0011] In the formula, R1 and R2 are independent C1-C9 straight-chain alkyl or branched alkyl groups, and n and m are natural numbers from 1 to 6.

[0012] This invention is the first to use secondary amines as extractants to separate scandium. The -NH group of the secondary amine can extract scandium under sulfuric acid medium and low acidity conditions. This process does not require a large amount of acid or alkali, avoiding the saponification or protonation process of acidic or alkaline extractants. Scandium is well separated from other elements, which can effectively shorten the extraction process and effectively avoid the formation of emulsions or three phases in the extraction system. The extracted organic phase is easy to back-extract and regenerate. Back-extraction can be achieved using weak acids or weak alkalis. The extraction conditions are easy to control, and it is economical, environmentally friendly and efficient.

[0013] The secondary amine extractant should have low water solubility, be readily soluble in low-level solvents, and exhibit no third phase or emulsification after extraction. Preferably, the secondary amine extractant is one or more of di-n-butylamine, diisobutylamine, di-n-hexylamine, diisopropylamine, di-n-octylamine, di-n-decylamine, didodecylamine, and diisooctylamine.

[0014] The organic solvent includes any one or more of sulfonated kerosene, toluene, n-dodecane, p-cymene, n-heptane, n-hexane, cyclohexane, cyclopentane, and petroleum ether.

[0015] The organic phase also includes a phase modifier, which includes at least one of the following: tributyl phosphate, dimethylheptyl methylphosphonate, diisoamyl methylphosphate, dodecanol, tetradecanol, hexadecyl alcohol, octadecyl alcohol, 1,2-decanediol, 1,2-dodecanediol, menthol, nonylphenol, and thymol. The addition of the modifier can more effectively promote rapid phase separation between the two phases and avoid the formation of emulsions or a third phase in the extraction system.

[0016] Preferably, the phase modifier is dodecanol and / or tetradecanol, which has low water solubility, can reduce contamination of the aqueous phase, and can effectively prevent the formation of emulsions or a third phase in the extraction system.

[0017] Preferably, the volume of the phase modifier is less than 40% of the volume of the organic solvent. Excessive addition of the phase modifier can lead to weak interactions such as hydrogen bonding with the extractant, potentially affecting the extraction capability of the organic phase. More preferably, the volume concentration of the phase modifier in the organic phase is 5-20%, and even more preferably 5-10%.

[0018] The volume of the secondary amine extractant is more than 3% of the volume of the organic solvent, preferably 3-60%; more preferably, the volume concentration of the secondary amine extractant in the organic phase is 10-40%. The concentration of the extractant has a significant impact on the extraction rate of scandium. Increasing the extractant concentration can improve the extraction rate of scandium, but a suitable concentration should be maintained to reduce the amount of extractant used and lower the cost.

[0019] Preferably, in this invention, the scandium-containing Hongtu nickel ore can undergo pre-treatment to remove impurities. The pH of the leaching solution of the scandium-containing laterite nickel ore is adjusted to 0-4, which can effectively remove impurities such as aluminum and iron. The extraction efficiency of the leaching solution is higher at this pH, preferably 0.5-3, further preferably 0.5-2, and even more preferably 0.75-1.5.

[0020] The volume ratio of the organic phase to the laterite nickel ore leaching solution is 10:1 to 1:10. As the organic phase / aqueous phase ratio gradually increases, the scandium extraction rate gradually increases. Preferably, the volume ratio of the organic phase to the laterite nickel ore leaching solution is 2:1 to 1:2.

[0021] The reaction time for the mixed extraction process is 1-60 min, preferably 30-60 min, to ensure that the extraction reaction reaches equilibrium.

[0022] Preferably, the above extraction process can be single-stage or multi-stage, with multi-stage referring to 1-3 stages. Multi-stage extraction can further improve the extraction yield and the purity of the finished product.

[0023] Preferably, the method further includes the step of washing and back-extracting the scandium-containing organic phase to achieve scandium enrichment and recovery.

[0024] The washing agent used includes one or more of hydrochloric acid, nitric acid, sulfuric acid, formic acid, acetic acid, EDTA, sodium formate, and sodium acetate to remove impurity elements co-extracted from the organic phase; the concentration of the washing agent is 0.01-1 mol / L, preferably 0.1-0.5 mol / L; the volume ratio of the washing agent to the scandium-containing organic phase is 10:1-1:10, preferably 1:1.

[0025] Further optimization is possible; the washing process can be single-stage or multi-stage, with multi-stage referring to stages 1-5.

[0026] In this invention, the extracted organic phase can be efficiently back-extracted using low-concentration acids, bases, or salts. The back-extraction agent includes acids, bases, or salts with a concentration of 0.1-6 mol / L; preferably, the concentration of the back-extraction agent is 0.2-1 mol / L.

[0027] Preferably, the volume ratio of the stripping agent to the scandium-containing organic phase is 1:2-1:20. More preferably, it is 1:1-1:10 to achieve scandium stripping and enrichment.

[0028] The acid includes one or more of hydrochloric acid, sulfuric acid, nitric acid, formic acid, acetic acid, oxalic acid, and citric acid;

[0029] The alkali includes one or more of sodium hydroxide, ammonia, and ammonium bicarbonate.

[0030] The salt includes one or more of sodium formate, sodium acetate, sodium oxalate, sodium citrate, sodium carbonate, and sodium bicarbonate.

[0031] Preferably, the organic phase after alkaline back-extraction is washed with deionized water and then recycled to selectively extract scandium from the laterite nickel ore leachate containing scandium.

[0032] Preferably, the organic phase after acid back-extraction is washed multiple times with dilute alkaline solutions such as sodium carbonate, sodium hydroxide, and ammonia until the aqueous phase is weakly alkaline. The organic phase is then washed with deionized water and recycled to selectively extract scandium from the laterite nickel ore leaching solution containing scandium. The concentration of the dilute alkaline solution is below 0.5 mol / L.

[0033] The scandium extraction rate can be achieved at over 75%, preferably over 80%, such as over 85% or over 90%, through single-stage extraction using the method of this invention. After single-stage extraction, back-extraction can achieve a 100% back-extraction rate.

[0034] Compared with the prior art, the present invention has the following beneficial effects:

[0035] This invention provides a method for extracting and recovering associated scandium from laterite nickel ore leaching. For the first time, secondary amines are used as the scandium extractant. This method has the advantages of low acid and alkali consumption. Acid extractants require early saponification, and alkali extractants require acid protonation. This invention does not require acid or alkali treatment, has high selectivity, and provides good separation of scandium from other elements. It can effectively shorten the extraction process and effectively avoid emulsification or three-phase formation in the extraction system. The extracted organic phase is easy to back-extract and regenerate. Back-extraction can be achieved using weak acids or weak alkalis. The extraction conditions are easy to control, and the method is economical, environmentally friendly, and highly efficient. Attached Figure Description

[0036] Figure 1 The graph shows the change in scandium extraction rate as a function of the volume ratio of the extractant in Example 1.

[0037] Figure 2 The graph shows the change in scandium extraction rate with the type of phase modifier in Example 2.

[0038] Figure 3 This refers to the phase separation phenomenon after the extraction reaction reaches equilibrium in Example 2.

[0039] Figure 4 The graph shows the change in scandium extraction rate as a function of the volume ratio of the phase modifier in Example 3.

[0040] Figure 5 The graph shows the change in scandium extraction rate as a function of the initial pH of the leachate in Example 4.

[0041] Figure 6 This refers to the phase separation phenomenon after the extraction reaction reached equilibrium in Example 4.

[0042] Figure 7 The graph shows the change in scandium extraction rate as a function of the volume ratio of organic phase to leachate in Example 5. Detailed Implementation

[0043] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention. Modifications or equivalent substitutions made by those skilled in the art based on their understanding of the technical solutions of this invention, without departing from the spirit and scope of the invention, should be covered within the protection scope of this invention.

[0044] The raw materials used in the following specific embodiments are all commercially available products or can be prepared by known methods.

[0045] The extraction rate E% of the element is calculated using the following formula:

[0046]

[0047] Where c i and c e The concentrations of elements in the leachate before and after extraction were determined using ICP-OES.

[0048] Example 1

[0049] First, diisooctylamine, dodecanol, and sulfonated kerosene were measured and mixed thoroughly at a volume ratio of 0.1:0.5:10 to 1.5:0.5:10 to obtain the extractable organic phase. The extractable organic phase was then mixed with a scandium-containing lateritic nickel ore leaching solution at pH 1.0 for extraction. The volume ratio of the organic phase to the leaching solution was 1:1. The concentrations of various elements in the scandium-containing leaching solution are shown in Table 1. A single-stage extraction was performed, and the extraction reaction time was 30 minutes.

[0050] Extraction experiment results as follows Figure 1 As shown in Table 2, the diisooctylamine percentage refers to the volume percentage of diisooctylamine relative to the total sulfonated kerosene. After single-stage extraction, the scandium extraction rate gradually increases with increasing diisooctylamine concentration in the organic phase, while the co-extraction rates of other elements are less than 10%. When the diisooctylamine volume fraction of sulfonated kerosene is above 3%, the scandium extraction rate is greater than 80%. When the diisooctylamine percentage is 5%, the scandium extraction rate is approximately 88%. When the diisooctylamine volume fraction is 15%, the scandium extraction rate is approximately 92%. Only the co-extraction rate of copper exceeds 5%, demonstrating excellent selectivity.

[0051] Table 1. Concentrations of various elements in scandium-containing leachate (g / L)

[0052] element Zn Ni Co Mn Mg Cu Sc concentration 5.74 73.0 19.0 8.25 1.68 4.09 0.653

[0053] Table 2. Effect of diisooctylamine concentration in the organic phase on the extraction rates (E%) of each element.

[0054] Diisooctylamine percentage (%) Mg Sc Mn Co Ni Cu Zn 1 0.00 8.6 0.01 0.00 0.00 0.02 0.01 3 0.01 79.8 0.13 0.08 0.07 0.96 0.06 5 0.02 87.8 0.16 0.10 0.09 1.82 0.08 7 0.02 90.0 0.16 0.10 0.09 2.47 0.10 9 0.02 90.9 0.16 0.10 0.09 4.13 0.11 10 0.02 91.8 0.16 0.11 0.10 4.89 0.11 15 0.03 92.1 0.17 0.11 0.10 5.34 0.11

[0055] Example 2:

[0056] The type of phase modifier in the extracted organic phase was changed. Decanol (DA), dodecanol (LA), tetradecyl alcohol (MA) and tributyl phosphate (TBP) were used as phase modifiers respectively. Diisooctylamine, phase modifier and sulfonated kerosene were weighed at a volume ratio of 0.5:0.5:10, mixed evenly, and subjected to single-stage extraction. The extraction reaction time was 30 minutes to obtain the extracted organic phase.

[0057] The organic phase was mixed with a scandium-containing lateritic nickel ore leaching solution at pH 1.0 for extraction. The volume ratio of the organic phase to the leaching solution was 1:1. The concentrations of various elements in the scandium-containing lateritic nickel ore leaching solution are shown in Table 1. The extraction experimental results are as follows: Figure 2 , Figure 3 As shown in Table 3, the phase separation phenomenon after the extraction reaction reaches equilibrium is as follows: Figure 3 As shown. Decanol, dodecanol, and tetradecyl alcohol can effectively prevent the formation of a third phase in the extraction system; however, a third phase still forms when TBP is used as a phase modifier. The extraction rate of scandium exceeds 80%, while the co-extraction rates of the other elements are less than 5%.

[0058] Table 3. Effects of different phase modifiers on extraction efficiency

[0059] Mg Sc Mn Co Ni Cu Zn Phaseless Modifier 0.00 85.2 0.01 0.01 0.00 3.42 0.00 Decanol 0.02 87.2 0.11 0.06 0.06 4.03 0.06 dodecanol 0.05 87.3 0.11 0.07 0.06 4.10 0.06 Tetradecyl alcohol 0.00 89.0 0.05 0.03 0.03 3.09 0.01 TBP 0.00 88.7 0.12 0.08 0.07 3.90 0.07

[0060] Example 3:

[0061] The proportion of phase modifier in the organic phase was changed, and tetradecyl alcohol was used as the phase modifier. Diisooctylamine, tetradecyl alcohol, and sulfonated kerosene were measured and mixed evenly according to a volume ratio of 0.5:0:10-0.5:2:10 to obtain the extractable organic phase. The extractable organic phase was mixed with a scandium-containing lateritic nickel ore leaching solution at pH 1.0 for extraction. The volume ratio of organic phase to leaching solution was 1:1. The concentrations of various elements in the scandium-containing lateritic nickel ore leaching solution are shown in Table 1. Single-stage extraction was performed, and the extraction reaction time was 30 minutes. The extraction experimental results are as follows: Figure 4 As shown in Table 4. The proportion of phase modifiers in the table refers to the volume percentage of the phase modifiers relative to the total amount of sulfonated kerosene.

[0062] It is evident that the scandium extraction rate gradually decreases with increasing proportions of phase modifier and organic solvent. When the phase modifier proportion is 20%, the scandium extraction rate is 51%, still exhibiting a high extraction rate, while the co-extraction rate of other elements is less than 5%, demonstrating a significant separation effect. The extracted organic phase was back-extracted using 0.5 mol / L hydrochloric acid, and the scandium back-extraction rate exceeded 90%, proving that this extractant can effectively achieve selective separation and recovery of scandium from laterite nickel ore leaching solutions. The preferred proportion of the phase modifier is 5-10%.

[0063] Table 4. Effect of the proportion of phase modifier in the organic phase on the extraction rate (E%) of each element.

[0064]

[0065]

[0066] Example 4:

[0067] Extraction was performed by changing the pH value of the lateritic nickel ore leaching solution containing scandium. Diisooctylamine, tetradecanol, and sulfonated kerosene were measured at a volume ratio of 0.5:0.5:10 and mixed evenly to obtain the extractable organic phase. The extractable organic phase was then mixed with the lateritic nickel ore leaching solution containing scandium for extraction. The volume ratio of the organic phase to the leaching solution was 1:1. Single-stage extraction was performed, and the extraction reaction time was 30 minutes.

[0068] The concentrations of various elements in the leachate of scandium-containing lateritic nickel ore are shown in Table 1, and the extraction experiment results are as follows: Figure 5 As shown in Table 5, the extraction rate of scandium exceeds 80% within the pH range of 0.75-1.5. When the pH is 3.0, the extraction rate of scandium is 42%, and the co-extraction rate of other elements is less than 5%, indicating good separation effect. Figure 6 The results showed that within the pH range of 0.75-1.5, the extraction system exhibited good phase separation after extraction, with no emulsification or third phase formation.

[0069] Table 5. Effect of initial pH of aqueous phase on the extraction rate (E%) of each element

[0070] Initial pH of leachate Mg Sc Mn Co Ni Cu Zn 0.75 0.03 93.0 0.28 0.20 0.19 2.44 0.24 1.00 0.00 92.9 0.16 0.11 0.10 3.35 0.15 1.42 0.01 87.4 0.02 0.01 0.01 4.08 0.02 1.69 0.01 74.1 0.00 0.00 0.00 4.29 0.00 2.00 0.00 57.9 0.00 0.00 0.00 4.59 0.00 2.50 0.00 49.6 0.00 0.00 0.00 4.59 0.00 3.00 0.01 42.7 0.00 0.00 0.00 4.08 0.00

[0071] Example 5:

[0072] The volume ratio of the organic phase to the scandium-containing lateritic nickel ore leachate at pH 1.0 was varied during the extraction process, with extraction experiments conducted at ratios ranging from 1 / 10 to 10 / 1. The volume ratio of diisooctylamine:tetradecyl alcohol:sulfonated kerosene in the organic phase was 0.5:0.5:10. Single-stage extraction was performed for 30 minutes. The concentrations of various elements in the scandium-containing lateritic nickel ore leachate are shown in Table 1. The extraction experimental results are as follows: Figure 7 As shown in Table 6, within the range of 1 / 2 to 2 / 1, the extraction rate of scandium exceeds 85%, the co-extraction rate of copper is less than 11%, and the co-extraction rate of other elements is less than 5%, demonstrating good separation performance.

[0073] Table 6. Effect of the volume ratio of organic phase to leachate on the extraction rate (E%) of each element.

[0074] compared to Mg Sc Mn Co Ni Cu Zn 1 / 10 0.18 9.79 0.48 0.88 0.46 2.66 1.10 1 / 6 0.92 24.97 1.07 1.22 1.05 1.04 1.28 1 / 2 0.95 85.86 1.05 1.27 0.96 2.57 1.47 1 / 1 0.37 89.08 0.45 0.47 0.38 4.82 0.71 2 / 1 0.03 87.00 0.25 0.56 0.17 11.00 0.94 6 / 1 0.00 80.15 0.00 0.00 0.00 24.40 0.00 10 / 1 0.06 75.85 0.19 0.26 0.26 24.82 0.18

[0075] Example 6:

[0076] Step 1: Following the extraction process of Example 1, a scandium-containing organic phase was obtained through single-stage extraction using a diisooctylamine:tetradecyl alcohol:sulfonated kerosene ratio of 0.5:0.5:10 at a 1 / 1 volume ratio. The concentrations of each element in the scandium-containing laterite nickel ore leaching solution are shown in Table 1. At this point, the extraction rate of scandium was 87.8%, the extraction rate of copper was 1.82%, and the extraction rates of the remaining elements were less than 1%.

[0077] Step 2: The scandium-containing organic phase is subjected to single-stage back-extraction using 0.5 mol / L hydrochloric acid. The volume ratio of the back-extraction agent to the scandium-containing organic phase is 1 / 1. The scandium back-extraction rate reaches 78%, and the back-extraction rate of the other elements reaches 100%. After two-stage back-extraction, the scandium back-extraction rate reaches 100%.

[0078] Step 3: Repeat the extraction process of Step 1 to obtain a scandium-containing organic phase. Use 0.1 mol / L sodium oxalate and 0.1 mol / L sodium hydroxide as back-extraction agents, respectively, with a volume ratio of 1:1 between the back-extraction agent and the scandium-containing organic phase. The scandium back-extraction rate reaches 100% in both cases. Using a low concentration of back-extraction agent achieves effective scandium back-extraction, which helps reduce the consumption of reagents such as acids and alkalis and shortens the process flow.

[0079] The embodiments of the present invention have been described above by way of example. However, the scope of protection of the present invention is not limited to the above embodiments. Any modifications, equivalent substitutions, improvements, etc., made by those skilled in the art within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A method for extracting and recovering scandium from laterite nickel ore, characterized in that, The steps include: dissolving a secondary amine extractant in an organic solvent to form an organic phase, and then mixing and extracting it with a scandium-containing lateritic nickel ore leachate to obtain a scandium-containing organic phase; the structure of the secondary amine extractant is as follows: ； In the formula, R1 and R2 are independent C1-C9 straight-chain alkyl or branched alkyl groups, and n and m are natural numbers from 1 to 6. The pH of the scandium-containing laterite nickel ore leaching solution is 0-3; The volume ratio of the organic phase to the laterite nickel ore leaching solution is 10:1-1:2; The organic phase further includes a phase modifier, which includes at least one of the following: tributyl phosphate, dimethylheptyl methylphosphonate, diisoamyl methylphosphate, dodecanol, tetradecanol, hexadecyl alcohol, octadecyl alcohol, 1,2-decanediol, 1,2-dodecanediol, menthol, nonylphenol, and thymol. The volume of the phase modifier is 5-40% of the volume of the organic solvent.

2. The method for extracting and recovering scandium from laterite nickel ore according to claim 1, characterized in that, The secondary amine extractant is one or more selected from di-n-butylamine, diisobutylamine, di-n-hexylamine, diisopropylamine, di-n-octylamine, di-n-decylamine, didodecylamine, and diisooctylamine; And / or, the organic solvent includes any one or more of sulfonated kerosene, toluene, n-dodecane, p-cymene, n-heptane, n-hexane, cyclohexane, cyclopentane, and petroleum ether.

3. The method for extracting and recovering scandium from laterite nickel ore according to claim 1, characterized in that, The volume of the secondary amine extractant is more than 3% of the volume of the organic solvent; And / or, the mixed extraction time is 1-60 min.

4. The method for extracting and recovering scandium from laterite nickel ore according to claim 1, characterized in that, It also includes the step of washing and back-extracting the scandium-containing organic phase to achieve scandium enrichment and recovery.

5. The method for extracting and recovering scandium from laterite nickel ore according to claim 4, characterized in that, The detergent used for washing includes any one or more of hydrochloric acid, nitric acid, sulfuric acid, formic acid, acetic acid, EDTA, sodium formate, and sodium acetate; the concentration of the detergent is 0.01-1 mol / L; and the volume ratio of the detergent to the scandium-containing organic phase is 10:1-1:

10.

6. The method for extracting and recovering scandium from laterite nickel ore according to claim 4, characterized in that, The back-extraction uses an extraction agent including an acid, base, or salt with a concentration of 0.1-6 mol / L.

7. The method for extracting and recovering scandium from laterite nickel ore according to claim 6, characterized in that, The volume ratio of the stripping agent to the scandium-containing organic phase is 1:2 to 1:

20.

8. The method for extracting and recovering scandium from laterite nickel ore according to claim 6, characterized in that, The acid includes one or more of hydrochloric acid, sulfuric acid, nitric acid, formic acid, acetic acid, oxalic acid, and citric acid; And / or, the alkali includes one or more of sodium hydroxide, ammonia, and ammonium bicarbonate; And / or, the salt includes one or more of sodium formate, sodium acetate, sodium oxalate, sodium citrate, sodium carbonate, and sodium bicarbonate.

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