Method and process for enhanced leaching of lateritic nickel ore

Abstract

Provided in the present application are a method and process for enhanced leaching of lateritic nickel ore. The method comprises: acquiring reaction conditions for a lateritic nickel ore leaching reaction; on the basis of the reaction conditions, determining a reaction model for the lateritic nickel ore leaching reaction, wherein reaction models include a liquid-layer diffusion-controlled model, a product-layer diffusion-controlled model and a reaction-controlled model; on the basis of the reaction model, determining the reaction conversion of the lateritic nickel ore leaching reaction; and on the basis of a reaction temperature, an acid-to-ore ratio and a reaction time, determining applicable reaction models under different reaction conditions, such that accurate control over a lateritic nickel ore leaching process can be achieved. The present application provides a theoretical basis and guidance for enhanced leaching of lateritic nickel ore, and improves the reaction rate of a lateritic nickel ore leaching reaction.

Description

A method and process for strengthening leaching of laterite nickel ore TECHNICAL FIELD

[0001] The present application relates to the technical field of laterite nickel ore hydrometallurgy, in particular to a method and process for strengthening leaching of laterite nickel ore. BACKGROUND

[0002] In the process flow of laterite nickel ore hydrometallurgy, the acid leaching process is one of the most important processes, which realizes the leaching of nickel, cobalt, manganese and other metals by mixing laterite nickel ore slurry with strong acid solution in a high-pressure kettle at high temperature and high pressure, and then obtains MHP products through impurity removal treatment. The recovery rate of nickel, cobalt and other metals in this process flow can reach 90% or more.

[0003] However, since the acid leaching process is a complex multi-phase reaction process, it is difficult to accurately reason about the reaction process and reaction results. However, in actual production, it is necessary to continuously improve the leaching rate of metals to improve production efficiency and reduce production cost. However, obtaining the best nickel and cobalt leaching rate requires several experiments under different conditions, and even several experiments are difficult to obtain the best leaching rate.

[0004] Therefore, it is urgent to provide a method and process for strengthening leaching of laterite nickel ore to improve the leaching efficiency of high-pressure acid leaching of laterite nickel ore.

[0005] SUMMARY

[0006] Therefore, it is necessary to provide a method and process for strengthening leaching of laterite nickel ore to solve the technical problem that the reaction in the acid leaching process of laterite nickel ore cannot be clearly described, which leads to the inability to effectively find the best leaching efficiency, thereby resulting in low leaching efficiency.

[0007] In one aspect, to solve the above technical problems, the present application provides a method for strengthening leaching of laterite nickel ore, comprising:

[0008] obtaining reaction conditions of a laterite nickel ore leaching reaction; the reaction conditions include reaction temperature, acid-ore ratio and reaction time;

[0009] determining a reaction model of the laterite nickel ore leaching reaction based on the reaction conditions; the reaction model includes a liquid layer diffusion control model, a product layer diffusion control model and a reaction control model;

[0010] determining a reaction conversion rate of the laterite nickel ore leaching reaction based on the reaction model;

[0011] determining a predicted gross profit of the laterite nickel ore leaching reaction based on the reaction conditions and the reaction conversion rate, and determining whether the predicted gross profit meets a target gross profit;

[0012] determining that the reaction condition is a target reaction condition when the predicted gross profit meets the target gross profit, and optimizing the reaction condition until the predicted gross profit meets the target gross profit when the predicted gross profit does not meet the target gross profit;

[0013] wherein the optimization manner of the reaction condition comprises at least one of increasing a reaction temperature, increasing an acid / ore ratio, and prolonging a reaction time.

[0014] In a possible implementation, the determining the reaction model of the laterite nickel ore leaching reaction based on the reaction temperature, the acid / ore ratio, and the reaction time comprises:

[0015] determining whether the reaction temperature is greater than a temperature threshold value;

[0016] determining the reaction model of the laterite nickel ore leaching reaction based on a first selection strategy, the acid / ore ratio, and the reaction time when the reaction temperature is less than or equal to the temperature threshold value;

[0017] determining the reaction model of the laterite nickel ore leaching reaction based on a second selection strategy, the acid / ore ratio, and the reaction time when the reaction temperature is greater than the temperature threshold value.

[0018] In a possible implementation, the determining the reaction model of the laterite nickel ore leaching reaction based on the first selection strategy, the acid / ore ratio, and the reaction time comprises:

[0019] determining whether the acid / ore ratio is greater than a first acid / ore ratio threshold value;

[0020] the reaction model being the reaction control model when the acid / ore ratio is less than or equal to the first acid / ore ratio threshold value;

[0021] determining whether the reaction time is less than a first reaction time threshold value when the acid / ore ratio is greater than the first acid / ore ratio threshold value;

[0022] the reaction model being the liquid layer diffusion control model when the reaction time is less than the first reaction time threshold value;

[0023] the reaction model being the product layer diffusion control model when the reaction time is greater than or equal to the first reaction time threshold value.

[0024] In a possible implementation, the determining the reaction model of the laterite nickel ore leaching reaction based on the second selection strategy, the acid / ore ratio, and the reaction time comprises:

[0025] determining whether the acid / ore ratio is greater than a second acid / ore ratio threshold value; the second acid / ore ratio threshold value being less than the first acid / ore ratio threshold value;

[0026] When the acid-to-ore ratio is less than or equal to the second acid-to-ore ratio threshold, the reaction model is the liquid layer diffusion control model;

[0027] When the acid-to-ore ratio is greater than the second acid-to-ore ratio threshold, it is determined whether the reaction time is less than the second reaction time threshold; the second reaction time threshold is less than the first reaction time threshold.

[0028] When the reaction time is less than the second reaction time threshold, the reaction model is the liquid layer diffusion control model;

[0029] When the reaction time is greater than or equal to the second reaction time threshold, the reaction model is the product layer diffusion control model.

[0030] In one possible implementation, the temperature threshold is 200°C, the first acid-to-mineral ratio is 0.35, the second acid-to-mineral ratio is 0.3, the first reaction time threshold is 60 minutes, and the second reaction time threshold is 50 minutes.

[0031] In one possible implementation, the liquid layer diffusion control model is as follows:

[0032] In the formula, r B b is the leaching rate of the reactants; b is the stoichiometric coefficient of the reactants; k c C is the mass transfer coefficient of the acid solution; A ε is the molar concentration of the acid solution; s R0 is the initial particle size of the ore; α is the stoichiometric ratio of the acid to the reactants; and X is the reaction conversion rate.

[0033] In one possible implementation, the product layer diffusion control model is as follows:

[0034] In the formula, r B b is the leaching rate of the reactants; c is the stoichiometric coefficient of the reactants; C A ε is the molar concentration of the acid solution; s R0 is the volume fraction of the reactants; R0 is the initial particle size of the ore; X is the reaction conversion rate; D0 is the volume fraction of the reactants. e is the effective diffusion coefficient of the reactants.

[0035] In one possible implementation, the reaction control model is:

[0036] In the formula, r B b is the leaching rate of the reactants; c is the stoichiometric coefficient of the reactants; C A ε is the molar concentration of the acid solution; sis the volume fraction of the reactant; R0 is the initial particle size of the ore; X is the reaction conversion rate; k is the reaction rate constant. R is the reaction rate constant.

[0037] In one possible implementation, the method further includes:

[0038] obtaining the molar density of the reactant of the laterite nickel ore leaching reaction, the cross-sectional area of the reactor, the solid feed density, the solid feed rate, and the length of the reactor;

[0039] determining the leaching amount of the laterite nickel ore leaching reaction based on the reaction conversion rate, the molar density of the reactant, the cross-sectional area of the reactor, the solid feed density, the solid feed rate, and the length of the reactor.

[0040] In another aspect, the application also provides a laterite nickel ore intensified leaching process for realizing the laterite nickel ore intensified leaching method.

[0041] The laterite nickel ore intensified leaching method is any one of the possible implementation manners described above.

[0042] The application has the following beneficial effects: the laterite nickel ore intensified leaching method provided by the application realizes the description of the reaction mechanism of the laterite nickel ore leaching reaction by dividing the reaction model of the laterite nickel ore leaching reaction into a liquid layer diffusion control model, a product layer diffusion control model, and a reaction control model. Moreover, the reaction model applicable under different reaction conditions is determined based on the reaction temperature, the acid-ore ratio, and the reaction time, which can realize the accurate control of the laterite nickel ore leaching process, provide a theoretical basis and guidance for the intensified leaching of the laterite nickel ore, and thus can improve the reaction rate of the laterite nickel ore leaching reaction. Furthermore, the predicted gross profit of the laterite nickel ore leaching reaction is determined based on the reaction conditions and the reaction conversion rate, and the reaction conditions are adjusted based on the predicted gross profit, so that the target reaction conditions obtained finally are the reaction conditions that meet the target gross profit, that is, the best reaction conditions corresponding to the target gross profit and the best reaction conversion rate corresponding to the best reaction conditions are found, and the leaching rate of the high-pressure acid leaching of the laterite nickel ore is intensified. BRIEF DESCRIPTION OF DRAWINGS

[0043] In order to more clearly illustrate the technical solutions in the embodiments of the application, the following will briefly introduce the drawings needed to be used in the embodiment description. Obviously, the drawings in the following description are only some embodiments of the application, and other drawings can also be obtained by those skilled in the art without any creative effort on the basis of these drawings.

[0044] FIG. 1 is a flowchart of one embodiment of the laterite nickel ore intensified leaching method provided by the application;

[0045] Fig. 2 is a flow diagram of one embodiment of S102 in Fig. 1;

[0046] Fig. 3 is a flow diagram of one embodiment of S202 in Fig. 2;

[0047] Fig. 4 is a flow diagram of one embodiment of S203 in Fig. 2;

[0048] Fig. 5 is a flow diagram of one embodiment of determining a reaction model according to the present application;

[0049] Fig. 6 is a flow diagram of one embodiment of determining the leaching amount of a laterite nickel ore leaching method according to the present application. DETAILED DESCRIPTION

[0050] The technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0051] It should be understood that the accompanying drawings are schematic and not drawn to scale. The flowcharts used in the present application show the operations implemented according to some embodiments of the present application. It should be understood that the operations of the flowcharts can not be implemented in sequence, and the steps without logical context relationship can be reversed in sequence or implemented simultaneously. In addition, one or more other operations can be added to the flowcharts or one or more operations can be removed from the flowcharts by those skilled in the art under the guidance of the content of the present application. Some block diagrams shown in the accompanying drawings are functional entities, which do not necessarily correspond to physically or logically independent entities. These functional entities can be implemented in the form of software, or in one or more hardware modules or integrated circuits, or in different network and / or processor systems and / or microcontroller systems.

[0052] Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the present application. The phrase appears at various places in the specification does not necessarily refer to the same embodiment, nor is it necessarily mutually exclusive of other embodiments, or an independent or alternative embodiment. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0053] The present application provides a laterite nickel ore intensified leaching method and process, which are described below respectively.

[0054] FIG. 1 is a schematic diagram of an embodiment of the method for intensified leaching of laterite nickel ore provided by the present application. As shown in FIG. 1, the method for intensified leaching of laterite nickel ore comprises:

[0055] S101, obtaining reaction conditions of a leaching reaction of laterite nickel ore, the reaction conditions comprising reaction temperature, acid-ore ratio, and reaction time;

[0056] S102, determining a reaction model of the leaching reaction of laterite nickel ore based on the reaction conditions; the reaction model comprising a liquid layer diffusion control model, a product layer diffusion control model, and a reaction control model;

[0057] S103, determining reaction conversion rate of the leaching reaction of laterite nickel ore based on the reaction model;

[0058] S104, determining predicted gross profit of the leaching reaction of laterite nickel ore based on the reaction conditions and the reaction conversion rate, and determining whether the predicted gross profit meets a target gross profit;

[0059] S105, when the predicted gross profit meets the target gross profit, determining that the reaction conditions are target reaction conditions; when the predicted gross profit does not meet the target gross profit, optimizing the reaction conditions until the predicted gross profit meets the target gross profit;

[0060] The optimization of the reaction conditions comprises at least one of increasing the reaction temperature, increasing the acid-ore ratio, and prolonging the reaction time.

[0061] It should be noted that in some actual application scenarios, the reaction conditions further comprise stirring speed, which is not considered when determining the reaction model, but can be additionally considered when optimizing the reaction conditions to improve the diversity of the optimization of the reaction conditions.

[0062] The reaction equation of the leaching reaction of laterite nickel ore is: (l) +bB (s) →cC N B =N B0 (1-X)

[0063] In the formula, A (l) is acid liquor; B (s) is a reactant, such as nickel oxide or cobalt oxide; C is a leaching product; b is the stoichiometric number of the reactant; c is the stoichiometric number of the leaching product; N B is the real-time molar mass of the reactant in the reaction kettle, mol; N B0 is the initial molar mass of the reactant in the reaction kettle, mol; and X is the reaction conversion rate, %.

[0064] It should be understood that, since the reactant comprises nickel and cobalt, the reaction conversion rate in step S103 comprises the reaction conversion rate of nickel and the reaction conversion rate of cobalt.

[0065] Specifically, the gross profit = ∑revenue - ∑cost

[0066] Wherein, the revenue = raw ore processing amount * (Ni content in raw ore * reaction conversion rate of Ni * price of Ni + Co content in raw ore * reaction conversion rate of Co * price of Co).

[0067] Wherein, the cost = steam usage amount * steam price + sulfuric acid usage amount * sulfuric acid price + electricity price * electricity usage amount. It should be understood that: the steam usage amount corresponds to the reaction temperature in the reaction condition, the sulfuric acid usage amount corresponds to the acid-ore ratio in the reaction condition, and the electricity usage amount corresponds to the reaction time in the reaction condition.

[0068] In other words, step S104 is specifically: determining the cost based on the reaction condition, determining the revenue based on the reaction conversion rate, and determining the predicted gross profit based on the cost and the revenue.

[0069] Compared with the prior art, the method for intensifying the leaching of laterite nickel ore provided by the embodiments of the present application realizes the description of the reaction mechanism of the leaching reaction of laterite nickel ore by dividing the reaction model of the leaching reaction of laterite nickel ore into a liquid layer diffusion control model, a product layer diffusion control model and a reaction control model. Moreover, the reaction model suitable for different reaction conditions is determined based on the reaction temperature, the acid-ore ratio and the reaction time, which can realize the accurate control of the leaching process of laterite nickel ore, provide a theoretical basis and guidance for the intensification of the leaching process of laterite nickel ore, and thus can improve the reaction rate of the leaching reaction of laterite nickel ore. Further, the predicted gross profit of the leaching reaction of laterite nickel ore is determined based on the reaction condition and the reaction conversion rate, and the reaction condition is adjusted based on the predicted gross profit, so that the finally obtained target reaction condition is the reaction condition that meets the target gross profit, that is: the best reaction condition corresponding to the target gross profit and the best reaction conversion rate corresponding to the best reaction condition are found, and the leaching rate of the high-pressure acid leaching of laterite nickel ore is intensified.

[0070] In order to improve the orderliness of the determination of the reaction model, in some embodiments of the present application, as shown in FIG. 2, step S102 includes:

[0071] S201, judging whether the reaction temperature is greater than a temperature threshold value;

[0072] S202, when the reaction temperature is less than or equal to the temperature threshold value, determining the reaction model of the leaching reaction of laterite nickel ore based on the first selection strategy, the acid-ore ratio and the reaction time;

[0073] S203, when the reaction temperature is greater than the temperature threshold value, determining the reaction model of the leaching reaction of laterite nickel ore based on the second selection strategy, the acid-ore ratio and the reaction time.

[0074] The embodiment of the present application considers that the reaction temperature is a conventional reaction condition setting item, and sets that the determination process of the reaction model is divided into a first selection strategy and a second selection strategy based on the relationship between the reaction temperature and the temperature threshold value, that is, the reaction temperature is taken as the primary condition for determining the reaction model, and the order and efficiency of determining the reaction model are improved.

[0075] In the specific embodiment of the present application, as shown in FIG. 3, step S202 includes:

[0076] S301, judging whether the acid-mine ratio is greater than a first acid-mine ratio threshold value;

[0077] S302, when the acid-mine ratio is less than or equal to the first acid-mine ratio threshold value, the reaction model is a reaction control model;

[0078] S303, when the acid-mine ratio is greater than the first acid-mine ratio threshold value, judging whether the reaction time is less than a first reaction time threshold value;

[0079] S304, when the reaction time is less than the first reaction time threshold value, the reaction model is a liquid layer diffusion control model;

[0080] S305, when the reaction time is greater than or equal to the first reaction time threshold value, the reaction model is a product layer diffusion control model.

[0081] In the specific embodiment of the present application, as shown in FIG. 4, step S203 includes:

[0082] S401, judging whether the acid-mine ratio is greater than a second acid-mine ratio threshold value; the second acid-mine ratio threshold value is less than the first acid-mine ratio threshold value;

[0083] S402, when the acid-mine ratio is less than or equal to the second acid-mine ratio threshold value, the reaction model is a liquid layer diffusion control model;

[0084] S403, when the acid-mine ratio is greater than the second acid-mine ratio threshold value, judging whether the reaction time is less than a second reaction time threshold value; the second reaction time threshold value is less than the first reaction time threshold value;

[0085] S404, when the reaction time is less than the second reaction time threshold value, the reaction model is a liquid layer diffusion control model;

[0086] S405, when the reaction time is greater than or equal to the second reaction time threshold value, the reaction model is a product layer diffusion control model.

[0087] The embodiment of the present application realizes accurate selection of the liquid layer diffusion control model, the product layer diffusion control model and the reaction control model through the acid-mine ratio and the reaction time, and further improves the accuracy of the finally determined reaction conversion rate, and provides a theoretical basis for the intensified leaching reaction of laterite nickel ore.

[0088] It should be understood that the temperature threshold, the first acid-ore ratio threshold, the second acid-ore ratio threshold, the first reaction time threshold and the second reaction time threshold can be set or adjusted according to the actual application scene.

[0089] In specific embodiments of the present application, the temperature threshold is 200℃, the first acid-ore ratio is 0.35, the second acid-ore ratio is 0.3, the first reaction time threshold is 60 minutes, and the second reaction time threshold is 50 minutes.

[0090] In specific embodiments of the present application, as shown in FIG. 5, the specific process of the reaction model determination is: judging whether the reaction temperature is greater than 200℃, when the reaction temperature is less than or equal to 200℃, judging whether the acid-ore ratio is greater than 0.35; when the acid-ore ratio is less than or equal to 0.35, the reaction model is the reaction control model; when the acid-ore ratio is greater than 0.35, judging whether the reaction time is less than 60 minutes; when the reaction time is less than 60 minutes, the reaction model is the liquid layer diffusion control model; when the reaction time is greater than or equal to 60 minutes, the reaction model is the product layer diffusion control model. When the reaction temperature is greater than 200℃, judging whether the acid-ore ratio is greater than 0.3, when the acid-ore ratio is less than or equal to 0.3, the reaction model is the liquid layer diffusion control model; when the acid-ore ratio is greater than 0.3, judging whether the reaction time is less than 50 minutes; when the reaction time is less than 50 minutes, the reaction model is the liquid layer diffusion control model; when the reaction time is greater than or equal to 50 minutes, the reaction model is the product layer diffusion control model.

[0091] In specific embodiments of the present application, the liquid layer diffusion control model is:

[0092] In the formula, r B is the leaching rate of the reactant, mol / m 3 ·s; b is the stoichiometric number of the reactant; k c is the mass transfer coefficient of the acid liquor; C A is the molar concentration of the acid liquor, mol / m 3 ; ε s is the volume fraction of the reactant; R0 is the initial particle size of the ore, m; α is the stoichiometric ratio of the acid liquor to the reactant; X is the reaction conversion rate.

[0093] The specific derivation process is: r B = R B S P n p

[0094] In the formula, s p is the available reaction area, m 2 ; R Ais the unit area leaching rate of acid liquid, mol / m 2 ·s; R B is the unit area leaching rate of reactant, mol / m 2 ·s; R0 is the initial particle size of ore, m; n p is the number of reaction particles in unit volume (m -3 ),

[0095] Then:

[0096] In the specific embodiments of the present application, the product layer diffusion control model is:

[0097] In the formula, r B is the leaching rate of reactant, mol / m 3 ·s; b is the stoichiometric number of reactant; C A is the molar concentration of acid liquid, mol / m 3 ; ε s is the volume fraction of reactant; R0 is the initial particle size of ore, m; X is the reaction conversion rate; D e is the effective diffusion coefficient of reactant.

[0098] The specific derivation process is as follows:

[0099] The diffusion flux conforms to Fick's law. In order to further derive the equation, the concentration distribution of component A in the solid product layer needs to be obtained. Since no chemical reaction occurs in the product layer, the mass transfer rate through the solid is constant:

[0100] The boundary conditions of the above ordinary differential equation are: C(R) = 0 C(R0) = C A

[0101] Therefore, the concentration distribution in the solid layer is

[0102] In the formula, C is the concentration difference between reactant and acid liquid.

[0103] In the specific embodiments of the present application, the reaction control model is:

[0104] In the formula, r B is the leaching rate of reactant, mol / m3·s; b is the stoichiometric number of reactant; C Ais the molar concentration of the acid solution, mol / m 3 ; ε s is the volume fraction of the reactant; R0 is the initial particle size of the ore, m; X is the reaction conversion rate; k R is the reaction rate constant.

[0105] The specific derivation process is as follows:

[0106] S p = 4πR 2

[0107] where k R is the reaction rate constant, 1 / s,

[0108] Since in actual engineering applications, more attention is paid to the leaching amount of the laterite nickel ore leaching reaction, in some embodiments of the present application, as shown in FIG. 6, the laterite nickel ore intensified leaching method further comprises:

[0109] S601, obtaining the cross-sectional area of the reaction kettle of the laterite nickel ore leaching reaction and the length of the reaction kettle;

[0110] S602, determining the leaching amount of the laterite nickel ore leaching reaction based on the reaction conversion rate, the cross-sectional area of the reaction kettle and the length of the reaction kettle.

[0111] The embodiments of the present application determine the leaching amount of the laterite nickel ore leaching reaction based on the reaction conversion rate, which can further provide guidance for actual industrial applications, provide an optimization direction for laterite nickel ore leaching, and further improve the leaching amount of the laterite nickel ore leaching reaction.

[0112] It should be understood that: the leaching amount is the integral of the reaction conversion rate per unit length along the length of the reaction kettle, and the reaction conversion rate per unit length is:

[0113] In the formula, z is the length of the reaction kettle; S is the cross-sectional area of the reaction kettle; ε s is the volume fraction of the reactant; p B is the molar density of the reactant; p p is the solid feed density; R B is the unit area leaching rate of the reactant; and F is the solid feed rate.

[0114] Then when the reaction model is a liquid layer diffusion control model:

[0115] Since when z = 0, X = 0, then:

[0116] When the reaction model is a product layer diffusion control model:

[0117] When the reaction model is the reaction control model:

[0118] To sum up, the laterite nickel ore intensified leaching method provided by the embodiments of the present application realizes the description of different stages of the leaching process based on the liquid layer diffusion control model, the product layer diffusion control model and the reaction control model, and realizes the switching of different control models through the three parameters of reaction temperature, acid-ore ratio and reaction time, realizes the accurate description of the mechanism of the laterite nickel ore leaching process, and further improves the accuracy of the determined reaction conversion rate. Further, on the premise of determining the reaction conversion rate, the embodiments of the present application determine the leaching amount based on the reaction conversion rate, which can provide an optimization direction for leaching amount optimization and improve the rationality of the laterite nickel ore leaching process.

[0119] On the other hand, the embodiments of the present application also provide a laterite nickel ore intensified leaching process for realizing the laterite nickel ore intensified leaching method based on the laterite nickel ore intensified leaching method.

[0120] The laterite nickel ore intensified leaching method is the laterite nickel ore intensified leaching method in any one of the above embodiments.

[0121] Those skilled in the art can understand that all or part of the processes of the above-mentioned embodiments can be completed by a computer program instructing related hardware (such as a processor, a controller, etc.) to complete, and the computer program can be stored in a computer readable storage medium. The computer readable storage medium is a disk, an optical disk, a read-only memory or a random access memory, etc.

[0122] The above provides a detailed description of a laterite nickel ore intensified leaching method and process provided by the present application. In this paper, specific examples are applied to describe the principles and implementation modes of the present application. The above embodiment description is only used to help understand the method and its core idea of the present application; at the same time, for those skilled in the art, according to the idea of the present application, the specific implementation mode and application range will be changed; in view of the above, the content of the specification should not be understood as a limitation of the present application.

Claims

1. A method for enhanced leaching of lateritic nickel ores, characterised in that, The method comprises: obtaining reaction conditions of a laterite nickel ore leaching reaction; the reaction conditions comprise a reaction temperature, an acid-ore ratio and a reaction time; determining a reaction model of the laterite nickel ore leaching reaction based on the reaction conditions; the reaction model comprises a liquid layer diffusion control model, a product layer diffusion control model and a reaction control model; determining a reaction conversion rate of the laterite nickel ore leaching reaction based on the reaction model; determining a predicted gross profit of the laterite nickel ore leaching reaction based on the reaction conditions and the reaction conversion rate, and determining whether the predicted gross profit meets a target gross profit; when the predicted gross profit meets the target gross profit, determining that the reaction conditions are target reaction conditions; when the predicted gross profit does not meet the target gross profit, optimizing the reaction conditions until the predicted gross profit meets the target gross profit; wherein the optimization of the reaction conditions comprises at least one of increasing the reaction temperature, increasing the acid-ore ratio and prolonging the reaction time.

2. The process for the enhanced leaching of nickel laterites according to claim 1, characterized in that, The determination of the reaction model of the laterite nickel ore leaching reaction based on the reaction temperature, the acid-ore ratio and the reaction time comprises: determining whether the reaction temperature is greater than a temperature threshold value; when the reaction temperature is less than or equal to the temperature threshold value, determining the reaction model of the laterite nickel ore leaching reaction based on a first selection strategy, the acid-ore ratio and the reaction time; when the reaction temperature is greater than the temperature threshold value, determining the reaction model of the laterite nickel ore leaching reaction based on a second selection strategy, the acid-ore ratio and the reaction time.

3. The process for the enhanced leaching of nickel laterites according to claim 2, characterized in that, The determination of the reaction model of the laterite nickel ore leaching reaction based on the first selection strategy, the acid-ore ratio and the reaction time comprises: determining whether the acid-ore ratio is greater than a first acid-ore ratio threshold value; when the acid-ore ratio is less than or equal to the first acid-ore ratio threshold value, the reaction model is the reaction control model; when the acid-ore ratio is greater than the first acid-ore ratio threshold value, determining whether the reaction time is less than a first reaction time threshold value; when the reaction time is less than the first reaction time threshold value, the reaction model is the liquid layer diffusion control model; when the reaction time is greater than or equal to the first reaction time threshold value, the reaction model is the product layer diffusion control model.

4. The process for the enhanced leaching of nickel laterites according to claim 3, characterized in that, The determination of the reaction model of the laterite nickel ore leaching reaction based on the second selection strategy, the acid-ore ratio and the reaction time comprises: determining whether the acid-ore ratio is greater than a second acid-ore ratio threshold value; the second acid-ore ratio threshold value is less than the first acid-ore ratio threshold value; when the acid-ore ratio is less than or equal to the second acid-ore ratio threshold value, the reaction model is the liquid layer diffusion control model; when the acid-ore ratio is greater than the second acid-ore ratio threshold value, determining whether the reaction time is less than a second reaction time threshold value; the second reaction time threshold value is less than the first reaction time threshold value; when the reaction time is less than the second reaction time threshold value, the reaction model is the liquid layer diffusion control model; when the reaction time is greater than or equal to the second reaction time threshold value, the reaction model is the product layer diffusion control model.

5. The process for the enhanced leaching of nickel laterites according to claim 4, characterized in that, The temperature threshold is 200℃, the first acid ore ratio is 0.35, the second acid ore ratio is 0.3, the first reaction time threshold is 60 minutes, and the second reaction time threshold is 50 minutes.

6. The process for the enhanced leaching of nickel laterites according to claim 1, characterized in that, The liquid layer diffusion control model is: where r B is the reaction rate of the reactant; b is the stoichiometric number of the reactant; k c is the mass transfer coefficient of the acid solution; C A is the molar concentration of the acid solution; ε s is the volume fraction of the reactant; R0 is the initial particle size of the ore; α is the stoichiometric ratio of the acid solution to the reactant; and X is the reaction conversion rate.

7. The process for the enhanced leaching of nickel laterites according to claim 1, characterized in that, The product layer diffusion control model is: where r B is the reaction rate of the reactant; b is the stoichiometric number of the reactant; C A is the molar concentration of the acid solution; ε s is the volume fraction of the reactant; R0 is the initial particle size of the ore; X is the reaction conversion rate; D e is the effective diffusion coefficient of the reactant.

8. The process for the enhanced leaching of nickel laterites according to claim 1, characterized in that, The reaction control model is: where r B is the reaction rate of the reactant; b is the stoichiometric number of the reactant; C A is the molar concentration of the acid solution; ε s is the volume fraction of the reactant; R0 is the initial particle size of the ore; X is the reaction conversion rate; k R is the reaction rate constant.

9. The process for the enhanced leaching of nickel laterites according to claim 1, characterized in that, The method further comprises: acquiring the cross-sectional area of the reactor of the laterite nickel ore leaching reaction and the length of the reactor; determining the leaching amount of the laterite nickel ore leaching reaction based on the reaction conversion rate, the cross-sectional area of the reactor, and the length of the reactor. Based on the laterite nickel ore intensified leaching method; 10. An enhanced leaching process of lateritic nickel ores, characterized in that, The laterite nickel ore intensified leaching method is the laterite nickel ore intensified leaching method in any one of claims 1-9. ​

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