Method for synergistically dissolving out aluminum ions and gallium ions in bauxite

Abstract

The invention relates to the technical field of bauxite treatment, in particular to a method for synergistically dissolving out aluminum ions and gallium ions of bauxite. The method comprises the steps that a composite additive, bauxite particles and circulating mother liquor are ground, and raw material ore pulp is obtained; wherein the composite additive comprises an alkaline earth metal compound and an amidoxime cluster compound; the raw material ore pulp is subjected to pre-desiliconization treatment, and desiliconized ore pulp is obtained; and the desilicication ore pulp is subjected to dissolution treatment, and dissolution ore pulp is obtained. According to the method, through the synergistic effect between the alkaline earth metal compound and the amidoxime cluster compound of the composite additive, the physical properties of the bauxite particles are changed by utilizing the alkaline earth metal compound, and the amidoxime cluster compound is responsible for efficiently capturing and transferring gallium and aluminum in the bauxite particles; therefore, the relative dissolution rate of gallium in the bauxite can be effectively increased to 73.0% or above, and the relative dissolution rate of aluminum in the bauxite can be effectively increased to 95% or above.

Description

Technical Field

[0001] The present application relates to the technical field of bauxite processing, and in particular to a method for synergistically dissolving aluminum ions and gallium ions from bauxite. Background Art

[0002] Gallium is known as the "food of the semiconductor industry" and is mainly used in semiconductors, optoelectronic materials, solar cells, new alloys and other fields. As photovoltaics, semiconductors and new energy continue to maintain rapid development with high certainty, the demand for gallium will continue to grow rapidly. At present, there is no independent deposit of gallium. Extracting gallium from bauxite is the largest source of gallium. In addition, the resin adsorption method is mainly used to extract gallium from the decomposition mother liquor after domestic bauxite dissolution. This method requires the gallium of bauxite to be dissolved as much as possible and enter the sodium aluminate solution. However, in the actual production process, only 30% to 40% of the gallium by weight of bauxite enters the gallium extraction purification mother liquor, while about 25% of the gallium by weight enters the alumina product, and 40% to 55% of the gallium by weight enters the red mud, which makes the gallium recovery rate low, which will cause the final gallium output to decrease. Therefore, improving the dissolution rate of gallium in bauxite is of great significance for the subsequent gallium extraction of sodium aluminate solution.

[0003] At present, there are few methods for enhancing the dissolution of gallium in bauxite, and in the prior art, gallium in the sodium aluminate solution will continue to accumulate, which will not only cause the dissolution rate of gallium to decrease, but also the dissolution rate of aluminum in bauxite will decrease significantly in this process.

[0004] The current research on the dissolution of gallium from enhanced bauxite includes: (1) investigating the dissolution process of gallium from imported trihydrate bauxite to identify the optimal conditions and achieve a gallium dissolution rate of 70% under the optimal conditions; (2) investigating the effects of parameters such as lime addition, temperature, and circulating mother liquor alkali concentration on the dissolution process of gallium from bauxite. It was found that under conditions of higher temperature and higher lime addition, the gallium dissolution rate was as high as 50%. Summary of the invention

[0005] The present application provides a method for collaboratively dissolving aluminum ions and gallium ions from bauxite to solve the following technical problem: how to simultaneously increase the dissolution rates of gallium and aluminum from bauxite.

[0006] In a first aspect, the present application provides a method for collaboratively dissolving aluminum ions and gallium ions from bauxite, the method comprising:

[0007] Grinding the composite additive, bauxite particles and circulating mother liquor to obtain a raw material slurry; wherein the composite additive comprises an alkaline earth metal compound and an amidoxime cluster compound;

[0008] The raw material pulp is subjected to a pre-desiliconization treatment to obtain a desiliconized pulp;

[0009] The desiliconized slurry is subjected to a dissolution treatment to obtain a dissolution slurry.

[0010] Optionally, the weight m1 of the alkaline earth metal compound and the weight m2 of the amidoxime cluster compound satisfy the relationship: m1:m2=(4-10):1.

[0011] Optionally, the type of the alkaline earth metal compound includes at least one of the following: calcium oxide, calcium hydroxide, magnesium oxide and magnesium hydroxide.

[0012] Optionally, the weight m3 of the composite additive and the dry weight m4 of the bauxite particles satisfy the relationship: m3:m4=(4-8):100; and / or

[0013] The weight m5 of the circulating mother liquor and the dry weight m4 of the bauxite particles satisfy the relationship: m5:m4=(300-500):100.

[0014] Optionally, the circulating mother liquor includes a caustic component, and the mass concentration of the caustic component is ≥220 g / L.

[0015] Optionally, the raw material slurry includes raw material particles with a preset particle size, and the weight m6 of the raw material particles with the preset particle size and the weight m7 of the raw material slurry satisfy the relationship: m6:m7=(10-40):100.

[0016] Optionally, the preset particle size is <250 μm; the raw material particles include fine-grained particles, the weight of the fine-grained particles is 20% to 25% of the weight of the raw material particles, and the particle size of the fine-grained particles is <74 μm.

[0017] Optionally, the temperature of the pre-desiliconization treatment is ≥90° C., and the time of the pre-desiliconization treatment is 8 h to 10 h.

[0018] Optionally, the temperature of the dissolution treatment is ≥260°C, and the time of the dissolution treatment is ≥1h.

[0019] Optionally, the desiliconized slurry is subjected to a dissolution treatment to obtain a dissolution slurry, and then the process comprises:

[0020] The dissolved slurry is subjected to a decomposition reaction to obtain a decomposition mother liquor;

[0021] Using part of the extract as the circulating mother liquid;

[0022] The remaining extract is used to extract aluminum to obtain an aluminum product.

[0023] The above technical solution provided by the embodiment of the present application has the following advantages compared with the prior art:

[0024] The embodiment of the present application provides a method for synergistically dissolving aluminum ions and gallium ions from bauxite. The method first grinds the bauxite particles, the composite additive and the circulating mother liquor, and the grinding process allows the three to be fully mixed. Under the action of the circulating mother liquor, the particle size of the bauxite particles can be reduced, so that the bauxite particles have a larger specific surface area. The bauxite particles with a larger specific surface area can effectively adsorb the alkaline earth metal compound and the amidoxime cluster compound of the composite additive. In the subsequent pre-desiliconization process, the alkaline earth metal compound can interact with the negative charge on the surface of the bauxite particles to weaken the electrostatic attraction between the ore particles, which helps to disperse and dissociate the bauxite particles, so as to promote the alkaline earth metal of the alkaline earth metal compound to fully react with the silicate component of the bauxite particles to form a soluble complex. Most of these soluble complexes The present invention discloses a method for preparing a pre-desiliconization treatment process, wherein the gallium and aluminum in the bauxite particles are both contained in the liquid phase, and these soluble complexes can be transferred from the bauxite particles to the liquid phase, so that the gallium and aluminum can be extracted from the bauxite particles by the alkaline earth metal compounds during the pre-desiliconization treatment process; in addition, in the subsequent dissolution treatment process, based on the multiple coordinating atoms possessed by the amidoxime cluster compound and its high affinity for trivalent ions, the amidoxime cluster compound can selectively and preferentially bind to and extract gallium and aluminum from the liquid phase and the bauxite particles, thereby improving the dissolution rate of gallium and aluminum from the bauxite particles; therefore, the method utilizes the synergistic effect between the alkaline earth metal compound of the composite additive and the amidoxime cluster compound, utilizes the alkaline earth metal compound to change the physical properties of the bauxite particles, and the amidoxime cluster compound is responsible for efficiently capturing and transferring the gallium and aluminum from the bauxite particles, thereby effectively improving the dissolution rate of gallium and aluminum from the bauxite. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0027] Figure 1 A schematic flow chart of a method for collaboratively dissolving aluminum ions and gallium ions from bauxite provided in an embodiment of the present application;

[0028] Figure 2 A detailed schematic diagram of a method for collaboratively dissolving aluminum ions and gallium ions from bauxite provided in an embodiment of the present application. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0030] Various embodiments of the present application may be presented in the form of a range; it should be understood that the description in the form of a range is only for convenience and brevity and should not be understood as a rigid limitation on the scope of the present application; therefore, it should be considered that the range description has specifically disclosed all possible sub-ranges and single numerical values ​​within the range; for example, it should be considered that the range description from 1 to 6 has specifically disclosed sub-ranges, such as from 1 to 3, from 1 to 4, from 1 to 5, from 2 to 4, from 2 to 6, from 3 to 6, etc., as well as single numbers within the range, such as 1, 2, 3, 4, 5 and 6, which applies regardless of the range; in addition, whenever a numerical range is indicated in this document, it is meant to include any cited number (fractional or integer) within the indicated range.

[0031] In this document, the terms including "including" and "including" mean "including but not limited to". Relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. "And / or" describes the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone; where A and B can be singular or plural. "At least one" means one or more, and "plurality" means two or more; "at least one", "at least one of the following" or similar expressions, refers to any combination of these items, including any combination of single or plural items; for example, "at least one of a, b, or c", or "at least one of a, b, and c" can all mean: a, b, c, ab (i.e., a and b), ac, bc, or abc, where a, b, and c can be single or multiple. "Parts" such as parts by weight and parts by mass indicate the proportional relationship between the components. In the proportional relationship involved in this article, the parameters that need to be described by proportion should be understood as the first term of the proportional formula in the order of description, and the proportional numbers should be understood as the second term of the proportional formula. For example, if the mass ratio of substance A, substance B and substance C is 1:2:3, then substance A, substance B and substance C should correspond to the proportional numbers in the proportional formula in the order of description, that is, the mass of substance A: the mass of substance B: the mass of substance C = 1:2:3.

[0032] Unless otherwise specified, various raw materials, reagents, instruments and equipment used in this article can be purchased from the market or prepared by existing methods.

[0033] It should be noted that, with respect to the prior art (1) recorded in the background technology, the inventors found that the use of imported bauxite for gallium extraction would lead to an increase in the extraction cost, and the gallium dissolution rate in the method used by the institute was only 70%; with respect to the prior art (2) recorded in the background technology, the inventors found that the gallium dissolution rate in the method used by the institute was only 52%, but excessive lime addition would cause the loss of aluminum in the bauxite during the dissolution process, thereby achieving the synergistic dissolution of aluminum and gallium in the bauxite.

[0034] Therefore, how to provide a method for synergistically dissolving aluminum ions and gallium ions in bauxite to synchronously improve the dissolution rate of gallium and aluminum in bauxite is a technical problem that urgently needs to be solved.

[0035] Figure 1 A schematic flow chart of a method for collaboratively dissolving aluminum ions and gallium ions from bauxite provided in an embodiment of the present application is exemplarily shown;

[0036] like Figure 1 As shown, the embodiment of the present application provides a method for collaboratively dissolving aluminum ions and gallium ions from bauxite, the method comprising:

[0037] S1. Grinding the composite additive, bauxite particles and circulating mother liquor to obtain a raw material slurry; wherein the composite additive comprises an alkaline earth metal compound and an amidoxime cluster compound;

[0038] S2. Pre-desiliconizing the raw material slurry to obtain a desiliconized slurry;

[0039] S3. subjecting the desiliconized slurry to a dissolution treatment to obtain a dissolution slurry.

[0040] It should be noted that, based on the different solubility of gallium in components such as bauxite and secondary minerals, the circulating mother liquor can effectively promote the combination of bauxite particles and composite additives to improve the dissolution effect of gallium in bauxite particles, thereby ultimately effectively improving the dissolution rate of gallium.

[0041] It should be noted that the bauxite particles can be large-particle bauxite obtained by crushing bauxite, the particle size of the bauxite particles is <250μm, and the weight of fine particles with a particle size of <74μm is 20% to 25% of the weight of the bauxite particles.

[0042] It should be noted that the bauxite may be monohydrate bauxite, wherein the weight content of gallium is greater than 45 ppm.

[0043] It should be noted that the circulating mother liquor may be a product derived from an on-site alumina production evaporation process, and the chemical composition of the circulating mother liquor may be: a mass concentration of caustic soda of 220 g / L, a weight content of alumina of 120 g / L, and an initial concentration of gallium of 0.35 g / L.

[0044] It should be noted that the amidoxime cluster compound is a macromolecular organic compound containing -CN(OH)-NH2 functional groups, and is a complex formed by combining an organic ligand (amidoxime) with metal ions through ion exchange or covalent bonding. The structure of the amidoxime cluster compound is relatively complex, and it has the advantages of a large surface area, a large aperture ratio, strong hydrophobicity and a high surface area, so it can form stable crystals and gel states, which makes the amidoxime cluster compound have higher separation performance.

[0045] It should be noted that the amidoxime cluster compound also has a certain redox activity, and can change the valence state of certain impurity metal ions during the leaching process, thereby improving the purity of gallium during the dissolution process.

[0046] It should be noted that the amidoxime cluster compound can be LSC-900 provided by Xi'an Lanxiao Technology Co., Ltd., which is used for the preparation of composite additives after being ground.

[0047] In some optional embodiments, the weight m1 of the alkaline earth metal compound and the weight m2 of the amidoxime cluster compound satisfy the relationship: m1:m2=(4-10):1;

[0048] In these embodiments, the weight m1 of the alkaline earth metal compound and the weight m2 of the amidoxime cluster compound can satisfy the relationship: m1:m2=(4-10):1, so that the composite additive has sufficient alkaline earth metal compounds and amidoxime cluster compounds, and the sufficient alkaline earth metal compound can fully interact with the negative charge on the surface of the bauxite particles to promote the alkaline earth metal of the alkaline earth metal compound to fully react with the silicate component of the bauxite particles to form a soluble complex, which is convenient for the alkaline earth metal compound to transfer gallium and aluminum from the bauxite particles to the liquid phase in the subsequent pre-desiliconization treatment; in addition, the sufficient amount of amidoxime cluster compounds can selectively and preferentially combine and extract gallium and aluminum from the liquid phase and the bauxite particles, thereby improving the dissolution rate of gallium and aluminum from the bauxite particles.

[0049] The weight m1 of the alkaline earth metal compound can be 4, 5, 6, 7, 8, 9 or 10.

[0050] It should be noted that the alkaline earth metal compound can also neutralize the acidic components of bauxite to stabilize the pH of the raw material slurry, thereby facilitating the stable implementation of subsequent pre-desiliconization treatment and dissolution treatment.

[0051] In some optional embodiments, the type of the alkaline earth metal compound includes at least one of the following: calcium oxide, calcium hydroxide, magnesium oxide and magnesium hydroxide;

[0052] In these embodiments, the types of alkaline earth metal compounds may include: at least one of calcium oxide, calcium hydroxide, magnesium oxide and magnesium hydroxide, which may cover most oxides containing calcium and magnesium or hydroxides containing calcium and magnesium. The electrostatic attraction between the mineral particles can be weakened by the interaction between these alkaline earth metal compounds and the negative charges on the surface of the bauxite particles, which helps to disperse and dissociate the bauxite particles, so as to enable the alkaline earth metals in the alkaline earth metal compounds to fully react with the silicate components of the bauxite particles to form soluble complexes. Most of these soluble complexes contain gallium and aluminum, so that gallium and aluminum can be transferred from the bauxite particles to the liquid phase through pre-desiliconization treatment in combination with alkaline earth metal compounds, so as to effectively improve the dissolution rate of gallium and aluminum in the bauxite.

[0053] In some optional embodiments, the weight m3 of the composite additive and the dry weight m4 of the bauxite particles satisfy the relationship: m3:m4=(4-8):100; and / or

[0054] The weight m5 of the circulating mother liquid and the dry weight m4 of the bauxite particles satisfy the relationship: m5:m4=(300-500):100;

[0055] In these embodiments, the weight m3 of the composite additive and the dry weight m4 of the bauxite particles can satisfy the relationship: m3:m4=(4-8):100, which enables the bauxite particles to have enough composite additives. A sufficient amount of composite additives can change the physical properties of the bauxite particles by using the alkaline earth metal compound through the synergistic effect between the alkaline earth metal compound and the amidoxime cluster compound, while the amidoxime cluster compound is responsible for efficiently capturing and transferring the gallium and aluminum of the bauxite particles, thereby effectively improving the dissolution rate of gallium and aluminum in the bauxite; in addition, the weight m5 of the circulating mother liquor and the dry weight m4 of the bauxite particles can satisfy the relationship: m5:m4=(300-500):100, which enables the bauxite particles to have enough circulating mother liquor. A sufficient amount of circulating mother liquor can increase the dissolution rate of gallium in the bauxite particles, thereby effectively improving the dissolution rate of gallium in the bauxite.

[0056] The weight m3 of the composite additive can be 4, 5, 6, 7 or 8.

[0057] The weight m5 of the circulating mother liquor can be 300, 350, 400, 450 or 500.

[0058] In some optional embodiments, the circulating mother liquor includes a caustic component, and the mass concentration of the caustic component is ≥220 g / L;

[0059] In these embodiments, the circulating mother liquor may include a caustic component, and the mass concentration of the caustic component may be ≥220 g / L, so that the circulating mother liquor has a sufficient amount of caustic component. A sufficient amount of caustic component can effectively increase the dissolution rate of gallium from bauxite particles, thereby effectively increasing the dissolution rate of gallium from bauxite.

[0060] In some optional embodiments, the raw material slurry includes raw material particles with a preset particle size, and the weight m6 of the raw material particles with the preset particle size and the weight m7 of the raw material slurry satisfy the relationship: m6:m7=(10-40):100;

[0061] In some optional embodiments, the preset particle size is less than 250 μm; the raw material particles include fine-grained particles, the weight of the fine-grained particles is 20% to 25% of the weight of the raw material particles, and the particle size of the fine-grained particles is less than 74 μm;

[0062] In these embodiments, the raw material slurry may include raw material particles with a preset particle size, and the weight m6 of the raw material particles with the preset particle size and the weight m7 of the raw material slurry may satisfy the relationship: m6:m7=(10-40):100, and the preset particle size may be <250 μm, and the raw material particles may include fine-grained particles, the weight of the fine-grained particles may be 20%-25% of the weight of the raw material particles, and the particle size of the fine-grained particles is <74 μm, so that the raw material slurry has a sufficient amount of fine-grained raw material particles, so that the raw material particles have a larger specific surface area, and the raw material particles with a larger specific surface area can effectively adsorb the alkaline earth metal compounds and amidoxime clusters of the composite additive. In the subsequent pre-desiliconization treatment and dissolution treatment process, the alkaline earth metal compounds can be used to change the physical properties of the bauxite particles through the synergistic effect between the alkaline earth metal compounds and the amidoxime clusters, and the amidoxime clusters are responsible for efficiently capturing and transferring the gallium and aluminum of the bauxite particles, thereby effectively improving the dissolution rate of gallium and aluminum in the bauxite.

[0063] The weight m6 of the raw material particles with the preset particle size can be 10, 15, 20, 25, 30, 35 or 40.

[0064] The weight of the fine size particles may be 20%, 21%, 22%, 23%, 24% or 25% of the weight of the raw material particles.

[0065] In some optional embodiments, the temperature of the pre-desiliconization treatment is ≥ 90° C., and the time of the pre-desiliconization treatment is 8 h to 10 h;

[0066] In these embodiments, the temperature of the pre-desiliconization treatment is ≥ 90°C, and the time of the pre-desiliconization treatment can be 8h to 10h, so that the pre-desiliconization treatment has sufficient temperature and sufficient time to enable the alkaline earth metal of the alkaline earth metal compound to fully react with the silicate component of the bauxite particles to form soluble complexes. Most of these soluble complexes contain gallium and aluminum, and these soluble complexes can be transferred from the bauxite particles to the liquid phase, so that gallium and aluminum can be extracted from the bauxite particles by the alkaline earth metal compound during the pre-desiliconization treatment. In addition, the pre-desiliconization treatment at a sufficient temperature can also activate the gallium element in the bauxite particles by the alkaline earth metal compound, so as to facilitate the selective and preferential binding of the amidoxime cluster compound and extract gallium and aluminum.

[0067] The temperature of the pre-desilication treatment may be 90°C, 95°C, 100°C, 105°C, 110°C, 115°C or 120°C.

[0068] The pre-desiliconization treatment time can be 8 h, 8.5 h, 9.0 h, 9.5 h or 10.0 h.

[0069] In some optional embodiments, the temperature of the dissolution treatment is ≥260°C, and the time of the dissolution treatment is ≥1h;

[0070] In these embodiments, the temperature of the dissolution treatment can be ≥260°C, and the time of the dissolution treatment can be ≥1h, so that the dissolution treatment is fully carried out. The gallium and aluminum in the liquid phase and the gallium and aluminum in the bauxite particles can be selectively and preferentially combined and extracted through the amidoxime cluster compound, thereby improving the dissolution rate of gallium and aluminum in the bauxite particles.

[0071] The temperature of the dissolution treatment may be 260°C, 265°C, 270°C, 275°C or 280°C.

[0072] The dissolution treatment time can be 1.0 h, 1.5 h, 2.0 h, 2.5 h or 3.0 h.

[0073] Figure 2 A detailed schematic diagram of a method for collaboratively dissolving aluminum ions and gallium ions from bauxite provided in an embodiment of the present application is exemplarily shown;

[0074] In some optional embodiments, such as Figure 2 As shown, the desiliconized slurry is subjected to a dissolution treatment to obtain a dissolution slurry, and then includes:

[0075] S4. The dissolved slurry is subjected to a decomposition reaction to obtain a decomposition mother liquor;

[0076] S5. Extracting gallium from the decomposed mother liquor to obtain a gallium product and an extract, respectively;

[0077] S6. Using part of the extract as the circulating mother liquid;

[0078] S7. extracting aluminum from the remaining extract to obtain an aluminum product;

[0079] In these embodiments, the liquid phase dissolution slurry containing gallium and aluminum is subjected to a decomposition reaction, gallium extraction, and aluminum extraction, and gallium and aluminum can be extracted respectively, thereby obtaining corresponding gallium products and aluminum products.

[0080] It should be noted that the extraction of gallium and the extraction of aluminum can both be carried out by resin adsorption method, for example, gallium and aluminum are adsorbed separately or sequentially by adsorption resin, and then eluted separately, so as to obtain corresponding gallium products and aluminum products.

[0081] In summary, the method for collaboratively dissolving aluminum ions and gallium ions from bauxite provided in the embodiments of the present application has the following advantages over the traditional method for extracting gallium and aluminum:

[0082] 1. High extraction efficiency: When alkaline earth metal compounds and amidoxime clusters are used together, the advantages of the two complement each other, and alkaline earth metals can improve the physical and chemical properties of bauxite particles, while amidoxime clusters are responsible for efficiently capturing and transferring the target metal elements of bauxite particles.

[0083] 2. Excellent leaching conditions: The use of composite additives can achieve efficient leaching operation within a wider range of operating parameters, thereby reducing the energy consumption and processing costs required for the overall method.

[0084] 3. Higher resource utilization rate: This method can significantly increase the recovery rate of gallium and aluminum in bauxite particles by adding composite additives, and also reduce the resource waste of bauxite particles, which is of great significance to environmental protection and social sustainable development.

[0085] The present application is further described below in conjunction with specific examples. The experimental methods in the following examples where specific conditions are not specified are usually measured in accordance with national standards / industry standards; if there are no corresponding national standards / industry standards, they are measured in accordance with common international standards, conventional conditions or conditions recommended by the manufacturer.

[0086] Example 1

[0087] like Figure 2 As shown, a method for cooperatively dissolving aluminum ions and gallium ions from bauxite comprises:

[0088] S1. The composite additive, bauxite particles and circulating mother liquor are ground to obtain a raw material slurry; wherein the composite additive comprises an alkaline earth metal compound and an amidoxime cluster compound LSC-900;

[0089] S2. Pre-desiliconizing the raw material slurry to obtain a desiliconized slurry;

[0090] S3. subjecting the desiliconized slurry to a dissolution treatment to obtain a dissolution slurry.

[0091] S4. The dissolved slurry is subjected to a decomposition reaction to obtain a decomposition mother liquor;

[0092] S5. extracting gallium from the decomposed mother liquor to obtain a gallium product and an extract;

[0093] S6. Using part of the extract as a circulating mother liquor;

[0094] S7. Extract aluminum from the remaining extract to obtain an aluminum product.

[0095] The weight m1 of the alkaline earth metal compound and the weight m2 of the amidoxime cluster compound satisfy the relationship: m1:m2=8:1.

[0096] The alkaline earth metal compound is calcium oxide.

[0097] The weight m3 of the composite additive and the dry weight m4 of the bauxite particles satisfy the relationship: m3:m4=5:100;

[0098] The weight m5 of the circulating mother liquor and the dry weight m4 of the bauxite particles satisfy the relationship: m5:m4=400:100.

[0099] The circulating mother liquor includes a caustic component, and the mass concentration of the caustic component is 225 g / L.

[0100] The raw material slurry includes raw material particles with a preset particle size, and the weight m6 of the raw material particles with the preset particle size and the weight m7 of the raw material slurry satisfy the relationship: m6:m7=25:100.

[0101] The preset particle size is less than 250 μm, the raw material particles include fine-grained particles, the weight of the fine-grained particles is 20% to 25% of the weight of the raw material particles, and the particle size of the fine-grained particles is less than 74 μm.

[0102] The temperature of the pre-desiliconization treatment is 90°C, and the time of the pre-desiliconization treatment is 8 hours.

[0103] The temperature of the dissolution treatment was 265°C, and the time of the dissolution treatment was 1 h.

[0104] Example 2

[0105] Based on the contents disclosed in Example 1, the following modifications are further made:

[0106] The weight m1 of the alkaline earth metal compound and the weight m2 of the amidoxime cluster compound satisfy the relationship: m1:m2=8:1.

[0107] The weight m3 of the composite additive and the dry weight m4 of the bauxite particles satisfy the relationship: m3:m4=8:100;

[0108] The weight m5 of the circulating mother liquor and the dry weight m4 of the bauxite particles satisfy the relationship: m5:m4=400:100.

[0109] The circulating mother liquor includes a caustic component, and the mass concentration of the caustic component is 220 g / L.

[0110] The raw material slurry includes raw material particles with a preset particle size, and the weight m6 of the raw material particles with the preset particle size and the weight m7 of the raw material slurry satisfy the relationship: m6:m7=25:100.

[0111] The temperature of the pre-desiliconization treatment is 95°C, and the time of the pre-desiliconization treatment is 10 hours.

[0112] The temperature of the dissolution treatment was 275°C, and the time of the dissolution treatment was 1 h.

[0113] Example 3

[0114] Based on the contents disclosed in Example 1, the following modifications are further made:

[0115] The weight m1 of the alkaline earth metal compound and the weight m2 of the amidoxime cluster compound satisfy the relationship: m1:m2=8:1.

[0116] The weight m3 of the composite additive and the dry weight m4 of the bauxite particles satisfy the relationship: m3:m4=6:100;

[0117] The weight m5 of the circulating mother liquor and the dry weight m4 of the bauxite particles satisfy the relationship: m5:m4=400:100.

[0118] The circulating mother liquor includes a caustic component, and the mass concentration of the caustic component is 220 g / L.

[0119] The raw material slurry includes raw material particles with a preset particle size, and the weight m6 of the raw material particles with the preset particle size and the weight m7 of the raw material slurry satisfy the relationship: m6:m7=25:100.

[0120] The temperature of the pre-desiliconization treatment is 95°C, and the time of the pre-desiliconization treatment is 10 hours.

[0121] The temperature of the dissolution treatment was 270°C, and the time of the dissolution treatment was 1 h.

[0122] Comparative Example 1

[0123] Based on the contents disclosed in Example 1, the following modifications are further made:

[0124] No composite additives are added.

[0125] Comparative Example 2

[0126] Based on the contents disclosed in Example 1, the following modifications are further made:

[0127] No amidoxime cluster compound is added, only the alkaline earth metal compound is added.

[0128] Comparative Example 3

[0129] Based on the contents disclosed in Example 1, the following modifications are further made:

[0130] No alkaline earth metal compound is added, only the amidoxime cluster compound is added.

[0131] Comparative Example 4

[0132] Based on the contents disclosed in Example 1, the following modifications are further made:

[0133] The weight m1 of the alkaline earth metal compound and the weight m2 of the amidoxime cluster compound satisfy the relationship: m1:m2=12:1.

[0134] Comparative Example 5

[0135] Based on the contents disclosed in Example 1, the following modifications are further made:

[0136] The weight m1 of the alkaline earth metal compound and the weight m2 of the amidoxime cluster compound satisfy the relationship: m1:m2=3:1.

[0137] Comparative Example 6

[0138] Based on the contents disclosed in Example 1, the following modifications are further made:

[0139] The weight m3 of the composite additive and the dry weight m4 of the bauxite particles satisfy the relationship: m3:m4=10:100.

[0140] Comparative Example 7

[0141] Based on the contents disclosed in Example 1, the following modifications are further made:

[0142] The temperature of the pre-desiliconization treatment is less than 90° C., the temperature of the pre-desiliconization treatment is 80° C., and the time of the pre-desiliconization treatment is 12 hours.

[0143] Comparative Example 8

[0144] Based on the contents disclosed in Example 1, the following modifications are further made:

[0145] The pre-desiliconization treatment time is 6 hours.

[0146] Comparative Example 9

[0147] Based on the contents disclosed in Example 1, the following modifications are further made:

[0148] The temperature of the dissolution treatment was <260°C, and the temperature of the dissolution treatment was 255°C.

[0149] Comparative Example 10

[0150] Based on the contents disclosed in Example 1, the following modifications are further made:

[0151] The dissolution treatment time is less than 1h, and the dissolution treatment time is 30min.

[0152] Related experiments and effect data:

[0153] The relative dissolution rates of the gallium products and aluminum products of the embodiments and comparative examples are shown in Table 1.

[0154] Table 1 Relative dissolution rates of gallium products and aluminum products in various embodiments and comparative examples

[0155]

[0156] As can be seen from Table 1, the embodiment of the present application provides a method for synergistically dissolving aluminum ions and gallium ions in bauxite. The method uses the synergistic effect between the alkaline earth metal compound and the amidoxime cluster compound of the composite additive to change the physical properties of the bauxite particles using the alkaline earth metal compound, while the amidoxime cluster compound is responsible for efficiently capturing and transferring the gallium and aluminum of the bauxite particles, thereby effectively increasing the relative dissolution rate of gallium in bauxite to more than 73.0% and the relative dissolution rate of aluminum to more than 95%.

[0157] In addition, an embodiment of the present application provides a method for synergistically dissolving aluminum ions and gallium ions in bauxite. This method, through the synergistic effect between the alkaline earth metal compound and the amidoxime cluster compound of the composite additive, utilizes the complementary advantages between the alkaline earth metal compound and the amidoxime cluster compound, and can achieve efficient leaching operation within a wider range of operating parameters, thereby reducing the energy consumption and processing costs required for the overall method.

[0158] In addition, the embodiments of the present application provide a method for the synergistic dissolution of aluminum ions and gallium ions in bauxite, which can significantly increase the recovery rate of gallium and aluminum in bauxite particles, thereby reducing the resource waste of bauxite particles, which is of great significance to environmental protection and social sustainable development.

[0159] The above description is only a specific implementation of the present application, so that those skilled in the art can understand or implement the present application. It will be apparent to those skilled in the art that various modifications to these embodiments are possible, and the general principles defined in the present application can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown in the present application, but will conform to the widest range consistent with the principles and novel features applied for by the present application.

Claims

1. A method for collaboratively dissolving aluminum ions and gallium ions from bauxite, the method comprising: Grinding the composite additive, bauxite particles and circulating mother liquor to obtain a raw material slurry; wherein the composite additive comprises an alkaline earth metal compound and an amidoxime cluster compound; The raw material pulp is subjected to a pre-desiliconization treatment to obtain a desiliconized pulp; The desiliconized slurry is subjected to a dissolution treatment to obtain a dissolution slurry.

2. The method according to claim 1, wherein the weight m1 of the alkaline earth metal compound and the weight m2 of the amidoxime cluster compound satisfy the relationship: m1:m2=(4-10):

1. 3 . The method according to claim 1 , wherein the type of the alkaline earth metal compound comprises at least one of the following: calcium oxide, calcium hydroxide, magnesium oxide and magnesium hydroxide.

4. The method according to claim 1, wherein the weight m3 of the composite additive and the dry weight m4 of the bauxite particles satisfy the relationship: m3:m4=(4-8):100; and / or The weight m5 of the circulating mother liquor and the dry weight m4 of the bauxite particles satisfy the relationship: m5:m4=(300-500):

100.

5. The method according to claim 1, wherein the circulating mother liquor comprises a caustic component, and the mass concentration of the caustic component is ≥220 g / L.

6. According to the method of claim 1, the raw material slurry includes raw material particles with a preset particle size, and the weight m6 of the raw material particles with the preset particle size and the weight m7 of the raw material slurry satisfy the relationship: m6:m7=(10-40):

100.

7. The method according to claim 6, wherein the preset particle size is less than 250 μm; the raw material particles include fine-grained particles, the weight of the fine-grained particles is 20% to 25% of the weight of the raw material particles, and the particle size of the fine-grained particles is less than 74 μm.

8. The method according to claim 1, wherein the temperature of the pre-desiliconization treatment is ≥ 90°C, and the time of the pre-desiliconization treatment is 8 hours to 10 hours.

9. The method according to claim 1, wherein the temperature of the dissolution treatment is ≥ 260°C, and the time of the dissolution treatment is ≥ 1 h.

10. The method according to claim 1, wherein the desiliconized slurry is subjected to a dissolution treatment to obtain a dissolution slurry, and then comprises: The dissolved slurry is subjected to a decomposition reaction to obtain a decomposition mother liquor; Extracting gallium from the decomposed mother liquor to obtain a gallium product and an extract respectively; Using part of the extract as the circulating mother liquid; The remaining extract is used to extract aluminum to obtain an aluminum product.

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