Process for preparing lanthanum oxide by recovering lanthanum samarium slag through nitrogen vortex separation method

Abstract

The invention provides a process for preparing lanthanum oxide by recovering lanthanum samarium slag through a nitrogen vortex separation method, which comprises the following steps: S1, distilling the lanthanum samarium slag through lanthanum thermal reaction, and then cutting into blocks for crushing; s2, the diced lanthanum samarium slag is put into a vertical compound crusher to be crushed; s3, separating metal lanthanum and samarium particles from the crushed particles through a particle winnowing machine; s4, performing precise winnowing on the lanthanum oxide and samarium oxide mixed powder to separate samarium oxide; s5, mixing the samarium oxide enrichment with a new material, and performing lanthanum thermal reaction distillation again; s6, the crushed lanthanum samarium powder is filled with nitrogen in a spiral separation powder stacking machine, and lanthanum powder is separated through vortexes; s7, the remaining lanthanum samarium powder is subjected to high-flow-rate separation, and after lanthanum powder is separated out, the lanthanum powder is returned to samarium oxide reduction production; and S8, the content of samarium in the recovered lanthanum powder is lower than 1%, and the recovered lanthanum powder can be used for lanthanum oxide electrolytic reduction to produce metal lanthanum. The method solves the problems of treatment and recovery of the lanthanum samarium slag, and has remarkable advantages in the aspects of environmental protection, cost, efficiency, product quality and the like.

Description

Technical Field

[0001] The invention relates to a method for recovering lanthanum and samarium slag, in particular to a process for recovering lanthanum and samarium slag and preparing lanthanum oxide by using a nitrogen eddy current separation method. Background Art

[0002] In recent years, with the widespread application of rare earth elements in high-tech fields such as magnetic materials, catalysts, optical glass, laser technology, etc., the demand for rare earth metals has increased. In particular, samarium metal plays an important role in these fields due to its unique physical and chemical properties. Lanthanum thermal reduction is a common process for producing samarium metal, which obtains samarium metal by reducing lanthanum oxide. However, in this process, lanthanum-samarium slag, a by-product containing lanthanum and samarium, is inevitably produced.

[0003] The treatment and recovery of lanthanum-samarium slag has always been a challenge in the rare earth industry. Traditional treatment methods mainly rely on hydrometallurgical technology, including acid dissolution, extraction and precipitation steps, to separate and purify lanthanum and samarium. However, this method has many disadvantages, such as high energy consumption, high cost and potential pollution to the environment. In addition, since the market prices of samarium oxide and lanthanum oxide do not fully reflect the acid dissolution and extraction costs in the production process, it is not economically viable to sell lanthanum and samarium as by-products. Summary of the invention

[0004] The present invention proposes a new method for recovering lanthanum-samarium slag, namely, nitrogen eddy current separation method. The method aims to recover lanthanum oxide from lanthanum-samarium slag in a more economical and environmentally friendly way through physical separation technology. The technology utilizes the difference in physical properties between lanthanum and samarium and realizes the effective separation of lanthanum and samarium through a specific process flow. Compared with traditional hydrometallurgical processes, nitrogen eddy current separation method is expected to reduce production costs, reduce environmental pollution, and improve the comprehensive utilization rate of resources.

[0005] To achieve the above object, the present invention provides the following technical solution: The present invention provides a process for recovering lanthanum and samarium slag to prepare lanthanum oxide by nitrogen eddy current separation method, comprising the following steps:

[0006] S1, distilling lanthanum-samarium slag through lanthanum thermal reaction, and cutting the distilled lanthanum-samarium slag ingot into pieces for subsequent crushing;

[0007] S2, putting the cut lanthanum and samarium slag into a vertical compound crusher for crushing;

[0008] S3, the crushed particles are then sent to a particle air separator for air separation, and the metal lanthanum particles and samarium particles are separated by wind power. The separated metal lanthanum particles and samarium particles will enter the next step of processing;

[0009] S4, performing air separation on the lanthanum oxide and samarium oxide mixed powder after air separation by a precision powder air separator to separate the samarium oxide enriched product;

[0010] S5, mixing the samarium oxide concentrate into new materials, and re-submitting the mixed materials to lanthanum thermal reaction to distill lanthanum samarium slag;

[0011] S6, putting the crushed lanthanum and samarium powder into a spiral separation powder stacking machine and filling it with nitrogen, using the centripetal force generated by the eddy current to push larger and heavier particles to the channel wall, thereby achieving preliminary separation of the lanthanum powder;

[0012] S7, separating the remaining lanthanum and samarium powder at a high flow rate to further separate the lanthanum powder, and returning the remaining lanthanum and samarium powder to the samarium oxide reduction production;

[0013] S8. The samarium content in the recovered lanthanum powder is less than 1%, and the lanthanum powder can be returned to the lanthanum oxide electrolytic reduction metal lanthanum production.

[0014] Preferably, the particle size of the crushed particles in S2 is less than 5 mm.

[0015] Preferably, the wind speed of the air-selected particles in S3 is controlled within the range of 10-20 m / s to ensure that the metallic lanthanum particles and the samarium particles can be effectively separated.

[0016] Preferably, the wind speed of the precision powder air separator in S4 is further controlled at 15-25 m / s to improve the separation efficiency of samarium oxide enrichment.

[0017] Preferably, the nitrogen flow rate of the spiral separation powder stacker in S6 is controlled at 20-30 m / s to ensure that the lanthanum powder can be fully separated under the action of the vortex.

[0018] Preferably, the flow rate of the high flow rate separation in S7 is set to 30-40 m / s to achieve efficient separation of lanthanum powder.

[0019] The present invention has at least the following beneficial effects:

[0020] The present invention provides a process for recovering lanthanum and samarium slag to prepare lanthanum oxide by a nitrogen eddy current separation method, which reduces the impact on the environment and reduces the discharge of harmful waste and wastewater generated in the traditional hydrometallurgical process;

[0021] Improve the resource recovery rate, effectively recover lanthanum and samarium from lanthanum-samarium slag through physical separation technology, and reduce resource waste;

[0022] Reduced production costs. Compared with traditional hydrometallurgical technology, the nitrogen vortex separation method reduces energy consumption and the use of chemical reagents, thereby reducing the overall production cost;

[0023] Improved production efficiency. Through optimized process flow and equipment configuration, rapid and continuous production was achieved, production cycle was shortened, and production efficiency was improved;

[0024] The product quality is optimized and the purity of the recovered lanthanum oxide and samarium oxide is ensured through sophisticated separation steps, meeting the material quality requirements of downstream applications.

[0025] In summary, the present invention not only solves the problem of lanthanum and samarium slag treatment and recovery, but also has significant advantages in environmental protection, cost, efficiency and product quality. This technical solution provides a new idea and method for the sustainable development of the rare earth industry, and has important application value and broad market prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 A flow chart provided for the present invention. DETAILED DESCRIPTION

[0027] Unless otherwise defined, all technical and scientific terms used in this specification have the same meanings as those commonly understood by technicians in the technical field to which the invention belongs. The terms used in this specification and in the description of the present invention are only for the purpose of describing specific embodiments and are not used to limit the present invention. The term "and / or" used in this specification includes any and all combinations of one or more related listed items.

[0028] Example

[0029] In this embodiment, if Figure 1 As shown, a process for recovering lanthanum and samarium slag to prepare lanthanum oxide by nitrogen eddy current separation method may include the following steps:

[0030] S1. First, lanthanum-samarium slag is distilled through lanthanum thermal reaction. Then, the distilled lanthanum-samarium slag ingot is cut into pieces for subsequent crushing.

[0031] S2, putting the chopped lanthanum-samarium slag into a vertical compound crusher for crushing. During the crushing process, the size of the crushed particles is controlled, preferably to be less than 5 mm, so as to facilitate the subsequent separation steps.

[0032] S3. The crushed particles are then sent to a particle air separator for air separation. By adjusting the wind speed of the air separator to control it within the range of 10-20m / s, the metal lanthanum particles and samarium particles are separated by wind power. The separated metal lanthanum particles and samarium particles will enter the next step of processing.

[0033] S4. The lanthanum oxide and samarium oxide mixed powder after air separation is air separated by a precision powder air separator. The wind speed is further adjusted to control at 15-25m / s to improve the separation efficiency of the samarium oxide enrichment, thereby separating the samarium oxide enrichment.

[0034] S5. The samarium oxide concentrate is mixed into new materials, and the mixed materials are subjected to lanthanum thermal reaction again to distill lanthanum samarium slag to recover samarium oxide.

[0035] S6. Put the crushed lanthanum and samarium powder into the spiral separation powder stacker and fill it with nitrogen. By adjusting the nitrogen flow rate to 20-30m / s, the centripetal force generated by the vortex effect is used to push the larger and heavier particles to the channel wall to achieve the initial separation of the lanthanum powder.

[0036] S7, separating the remaining lanthanum and samarium powder at a high flow rate to further separate the lanthanum powder. The flow rate is adjusted to 30-40 m / s to achieve efficient separation of the lanthanum powder. The remaining lanthanum and samarium powder is returned to the samarium oxide reduction production.

[0037] S8. The samarium content in the recovered lanthanum powder is less than 1%, and the lanthanum powder can be returned to the lanthanum oxide electrolytic reduction metal lanthanum production.

[0038] Through the above steps, this embodiment provides a process for recovering lanthanum and samarium slag to prepare lanthanum oxide by nitrogen eddy current separation method, which not only reduces the impact on the environment and reduces the discharge of hazardous wastes and wastewater, but also improves the recovery rate of resources, reduces production costs, improves production efficiency, and optimizes product quality.

[0039] The present invention not only solves the problem of lanthanum and samarium slag treatment and recovery, but also has significant advantages in environmental protection, cost, efficiency and product quality. The technical solution provides a new idea and method for the sustainable development of the rare earth industry, and has important application value and broad market prospects.

[0040] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them. Under the concept of the present invention, the technical features in the above embodiments or different embodiments may also be combined, the steps may be implemented in any order, and there are many other changes in different aspects of the present invention as above, which are not provided in detail for the sake of simplicity. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they may still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A process for preparing lanthanum oxide by recovering lanthanum and samarium slag by nitrogen eddy current separation method, characterized in that: The following steps are involved: S1, distilling lanthanum-samarium slag through lanthanum thermal reaction, and cutting the distilled lanthanum-samarium slag ingot into pieces for subsequent crushing; S2, putting the cut lanthanum and samarium slag into a vertical compound crusher for crushing; S3, the crushed particles are then sent to a particle air separator for air separation, and the metal lanthanum particles and samarium particles are separated by wind power. The separated metal lanthanum particles and samarium particles will enter the next step of processing; S4, performing air separation on the lanthanum oxide and samarium oxide mixed powder after air separation by a precision powder air separator to separate the samarium oxide enriched product; S5, mixing the samarium oxide concentrate into new materials, and re-submitting the mixed materials to lanthanum thermal reaction to distill lanthanum samarium slag; S6, putting the crushed lanthanum and samarium powder into a spiral separation powder stacking machine and filling it with nitrogen, using the centripetal force generated by the eddy current to push larger and heavier particles to the channel wall, thereby achieving preliminary separation of the lanthanum powder; S7, separating the remaining lanthanum and samarium powder at a high flow rate to further separate the lanthanum powder, and returning the remaining lanthanum and samarium powder to the samarium oxide reduction production; S8. The samarium content in the recovered lanthanum powder is less than 1%, and the lanthanum powder can be returned to the lanthanum oxide electrolytic reduction metal lanthanum production.

2. The process for preparing lanthanum oxide by recovering lanthanum and samarium slag by nitrogen eddy current separation method according to claim 1, characterized in that: The size of the crushed particles in S2 is less than 5 mm.

3. The process for preparing lanthanum oxide by recovering lanthanum and samarium slag by nitrogen eddy current separation method according to claim 1, characterized in that: The wind speed of the air-selected particles in S3 is controlled within the range of 10-20 m / s to ensure that the metal lanthanum particles and the samarium particles can be effectively separated.

4. The process for preparing lanthanum oxide by recovering lanthanum and samarium slag by nitrogen eddy current separation method according to claim 1, characterized in that: The wind speed of the precision powder air separator in S4 is further controlled at 15-25 m / s to improve the separation efficiency of samarium oxide enrichment.

5. The process for preparing lanthanum oxide by recovering lanthanum and samarium slag by nitrogen eddy current separation method according to claim 1, characterized in that: The nitrogen flow rate of the spiral separation powder stacker in S6 is controlled at 20-30 m / s to ensure that the lanthanum powder can be fully separated under the action of the vortex.

6. The process for preparing lanthanum oxide by recovering lanthanum and samarium slag by nitrogen eddy current separation method according to claim 1, characterized in that: The flow rate of the high flow rate separation in S7 is set to 30-40 m / s to achieve efficient separation of lanthanum powder.

Images