Quartz tube assembly structure for tube furnace and method for dissolving rhodium powder

Abstract

The present application relates to non-ferrous metallurgy technical field, especially a kind of quartz tube assembly structure for tubular furnace and rhodium powder dissolving method, it includes quartz tube body, gas inlet assembly and gas outlet assembly, at least one rotating gear is connected to the outer surface of quartz tube body.Set up at least one power transmission assembly in the furnace body of tubular furnace when rhodium powder is dissolved using the quartz tube assembly structure, quartz tube assembly structure is set in furnace body, one power transmission assembly and one rotating gear are matched and connected together, so that in reaction, power transmission assembly can make quartz tube body 360 continuous variable speed rotation, the mixture of rhodium powder and reaction sodium in quartz tube body is in rotating rolling state, it is favorable that material is exposed more phase interface and active site under stirring, in specific atmosphere gas, material is wrapped by atmosphere gas, thereby effectively improve reaction efficiency, reaction is more sufficient, and then improve rhodium powder dissolving conversion rate.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of non-ferrous metallurgy, in particular to a quartz tube assembly structure for a tube furnace and a method for dissolving rhodium powder. BACKGROUND

[0002] Among the platinum group metal elements, rhodium has stable resistance and good electrical conductivity, thermal conductivity and high catalytic activity. Rhodium has very stable chemical properties, good acid and alkali corrosion resistance and high temperature oxidation resistance, and is widely used in daily life, agriculture, traditional industry, high-tech, military aerospace, medicine and health, environmental protection and other fields.

[0003] The dissolution of noble metal rhodium is an indispensable key link for rhodium separation, purification and refining, and rhodium compound preparation, and is also an industry-recognized difficult problem. In the application of rhodium, rhodium needs to be effectively dissolved to convert it into a solution and exist in the form of a complex, and then be separated, purified, and synthesized and prepared into rhodium compounds and organic compounds. The most chemically inert noble metal rhodium is difficult to completely dissolve even with aqua regia for several months. At present, the dissolution of rhodium powder mainly adopts a medium-temperature chlorination method to dissolve rhodium materials, and the specific steps are as follows: first, the rhodium powder material and sodium chloride added in a certain proportion are placed in a tube furnace, the tube furnace includes a furnace body and a quartz tube assembly structure, the quartz tube assembly structure is installed in the furnace body, the quartz tube assembly structure includes a quartz tube body, a gas inlet assembly and a gas outlet assembly, one end of the quartz tube body is a feeding port, the other end of the quartz tube body is a discharging port, a detachable gas inlet sealing fluorine flange is arranged at the feeding port, a detachable gas outlet sealing fluorine flange is arranged at the discharging port, the gas inlet assembly communicates with the quartz tube body through the gas inlet sealing fluorine flange, and the gas outlet assembly communicates with the quartz tube body through the gas outlet sealing fluorine flange; the rhodium powder material and the sodium chloride are placed in the quartz tube body; then chlorine gas is introduced for staged reaction, the first stage reaction temperature is 500 DEG C, the constant temperature is 2h, the second stage reaction temperature is 700 DEG C, and the constant temperature is 30min, and the quartz tube body is in a fixed state during the reaction; after the reaction is completed, the tube furnace is cooled to room temperature, the product in the tube furnace is transferred to a container, and sodium hexachlororhodate solution is obtained by pure water or dilute acid leaching. This method can complete the dissolution and conversion of rhodium powder, but the one-time dissolution and conversion rate is only 72%-76%, the dissolution and conversion rate is low, and it is not conducive to large-scale use. SUMMARY

[0004] The technical problem to be solved by the present application is to provide a quartz tube assembly structure of a tube furnace capable of improving the dissolution and conversion rate of rhodium powder.

[0005] The technical scheme adopted by the present application to solve its technical problems is: a quartz tube assembly structure for a tube furnace, comprising a quartz tube body, an air inlet assembly and an air outlet assembly, one end of the quartz tube body is a feeding port, the other end of the quartz tube body is a discharging port, a detachable air inlet sealing fluorine flange is arranged at the feeding port, a detachable air outlet sealing fluorine flange is arranged at the discharging port, the air inlet assembly is connected in communication with the quartz tube body through the air inlet sealing fluorine flange, the air outlet assembly is connected in communication with the quartz tube body through the air outlet sealing fluorine flange, and at least one rotary gear is arranged on the outer surface of the quartz tube body.

[0006] Further, the number of rotary gears is two, and the two rotary gears are respectively located on the two sides of the quartz tube body.

[0007] Further, a plurality of material guiding assemblies are arranged on the inner wall of the quartz tube body.

[0008] Further, all the material guiding assemblies are uniformly distributed on the circumference of the quartz tube body.

[0009] The material guiding assembly comprises a connecting rod and a material guiding plate, one end of the connecting rod is connected with the inner wall of the quartz tube body, and the other end of the connecting rod is connected with the material guiding plate.

[0010] Further, the quartz tube body sequentially comprises a first small-diameter section, a large-diameter section and a second small-diameter section from left to right, the cross-sectional circle diameter of the large-diameter section is greater than that of the first small-diameter section, and the cross-sectional circle diameter of the first small-diameter section is equal to that of the second small-diameter section.

[0011] The material guiding assembly is arranged on the inner wall of the large-diameter section.

[0012] Further, the air inlet assembly comprises an air inlet, an air inlet rotary joint and an air inlet pipe, the air inlet and the air inlet pipe are arranged on the air inlet rotary joint, and the air inlet pipe can rotate in the air inlet rotary joint.

[0013] The air outlet assembly comprises an air outlet, an air outlet rotary joint and an air outlet pipe, the air outlet and the air outlet pipe are arranged on the air outlet rotary joint, and the air outlet pipe can rotate in the air outlet rotary joint.

[0014] In addition, the present application also solves the technical problem of providing a rhodium powder dissolving method with high dissolving conversion rate.

[0015] The rhodium powder dissolving method is carried out by using a tube furnace, the tube furnace comprises a furnace body and the above-mentioned quartz tube assembly structure for a tube furnace, at least one power transmission assembly is arranged in the furnace body, the quartz tube assembly structure is arranged in the furnace body, and one power transmission assembly and one rotary gear are matched and connected together.

[0016] Preferably, the dissolving method comprises the following steps:

[0017] S1: The rhodium powder and sodium chloride are respectively subjected to particle refinement treatment;

[0018] S2: The rhodium powder and sodium chloride subjected to the refinement treatment in step S1 are first mixed according to a certain proportion, and then the mixed mixture is loaded into the quartz tube body from the feeding port;

[0019] S3: The mixture is subjected to reaction in the tube furnace, and during the reaction, the power transmission assembly is controlled to work, so that the quartz tube body rotates around the horizontal center axis thereof;

[0020] S4: After the reaction is completed, the product in the tube furnace is transferred to a container after the tube furnace is cooled to room temperature, and a sodium hexachlororhodate solution is obtained through pure water or dilute acid leaching.

[0021] Preferably, in step S1, the particle size of the rhodium powder subjected to the refinement treatment is ≤300 μm, and the particle size of the sodium chloride subjected to the refinement treatment is ≤300 μm.

[0022] In step S2, the mass ratio of the rhodium powder to the sodium chloride is 1:1-5.

[0023] Preferably, in step S3, during the reaction, nitrogen gas is first introduced into the quartz tube body through the gas inlet assembly, the nitrogen gas flow rate is 0-50 L / min, the nitrogen gas aeration time is 5-150 min, then chlorine gas is introduced into the quartz tube body through the gas inlet assembly for reaction, the chlorine gas flow rate is 0-50 L / min, the chlorine gas aeration time is 5-300 min, and finally, after the reaction is completed, nitrogen gas is introduced into the quartz tube body through the gas inlet assembly, and the nitrogen gas aeration time is 30-90 min.

[0024] The quartz tube assembly structure for the tube furnace of the application has at least one rotating gear connected to the outer surface of the quartz tube body, and when the rhodium powder is dissolved by using the quartz tube assembly structure, at least one power transmission assembly is arranged in the furnace body of the tube furnace, the quartz tube assembly structure is arranged in the furnace body, and one power transmission assembly and one rotating gear are matched and connected together, so that the power transmission assembly can continuously rotate the quartz tube body at 360° during the reaction, the mixture of the rhodium powder and sodium chloride in the quartz tube body is in a rotating and rolling state, which is beneficial to exposing more phase interfaces and active sites of the material under stirring, the material is wrapped by the atmosphere gas in a specific atmosphere gas, thereby effectively improving the reaction efficiency, the reaction is more complete, and the rhodium powder dissolution conversion rate is improved.

[0025] The rhodium powder dissolution method of this invention adopts the quartz tube assembly structure of this invention. During the reaction, the mixture of rhodium powder and sodium chloride inside the quartz tube is in a rotating and rolling state, which improves the reaction efficiency and makes the reaction more complete. With the corresponding reaction parameters, the one-time dissolution conversion rate of rhodium powder is >96%, which is much higher than the one-time dissolution conversion rate of rhodium powder dissolved by the medium-temperature chlorination method in the prior art. In addition, this method does not introduce other metal impurity elements, has high batch production repeatability, and the relative standard deviation of repeatable production is less than 0.9%, which is conducive to large-scale use. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the quartz tube assembly structure;

[0027] Figure 2 This is a schematic diagram of the cross-sectional structure of a quartz tube.

[0028] Figure 3 This is a partial schematic diagram of the quartz tube assembly structure;

[0029] The following are labeled in the diagram: Quartz tube body 1, first small diameter section 11, large diameter section 12, second small diameter section 13, inlet sealing PTFE flange 2, outlet sealing PTFE flange 3, rotating gear 4, material guide assembly 5, connecting rod 51, material guide plate 52, air inlet 61, air inlet rotary joint 62, air inlet pipe 63, air outlet 71, air outlet rotary joint 72, air outlet pipe 73. Detailed Implementation

[0030] The invention will be further described below with reference to the accompanying drawings.

[0031] like Figure 1 , Figure 2 and Figure 3 As shown, the quartz tube assembly structure for a tube furnace of the present invention includes a quartz tube body 1, an inlet assembly, and an outlet assembly. One end of the quartz tube body 1 is a feed inlet, and the other end is a discharge outlet. A detachable inlet sealing PTFE flange 2 is provided at the feed inlet, and a detachable outlet sealing PTFE flange 3 is provided at the discharge outlet. The inlet assembly passes through the inlet sealing PTFE flange 2 and is connected to the quartz tube body 1. The outlet assembly passes through the outlet sealing PTFE flange 3 and is connected to the quartz tube body 1. At least one rotating gear 4 is connected to the outer surface of the quartz tube body 1.

[0032] The gases involved in the reaction and atmosphere are introduced into the quartz tube 1 through the inlet assembly, while the gases generated in the quartz tube 1, along with other gases, are discharged through the outlet assembly. The feed port is threadedly connected to the inlet sealing PTFE flange 2. During feeding, the inlet sealing PTFE flange 2 is removed from the feed port, and the reacting materials are loaded into the quartz tube 1 through the feed port. The discharge port is also threadedly connected to the outlet sealing PTFE flange 3. During discharge, the outlet sealing PTFE flange 3 is removed from the discharge port, and the material in the quartz tube 1 is removed from the discharge port.

[0033] When the rhodium powder is dissolved by using the quartz tube assembly structure, at least one power transmission assembly is arranged in the furnace body of the tube furnace, the quartz tube assembly structure is arranged in the furnace body, and one power transmission assembly is matched and connected with one rotating gear, so that the power transmission assembly can continuously rotate the quartz tube body at 360° during the reaction. Preferably, the power transmission assembly comprises a motor, a transmission shaft and a transmission gear. The transmission shaft is connected with the output shaft of the motor, the transmission gear is arranged on the transmission shaft, the transmission gear is matched and connected with the rotating gear 4, during the reaction, the output shaft of the motor drives the transmission shaft to rotate, the transmission shaft drives the transmission gear to rotate, the transmission gear drives the rotating gear 4 to rotate, and the rotating gear 4 drives the quartz tube body 1 to rotate. In order to realize the continuous variable-speed rotation of the quartz tube body at 360°, the motor is a variable-frequency servo motor.

[0034] In order to improve the stability of the quartz tube body during the rotation at 360°, as shown in Figure 1 , the number of the rotating gears 4 is two, and the two rotating gears 4 are located at the two sides of the quartz tube body 1.

[0035] In order to further improve the reaction efficiency of the material in the quartz tube body 1 and make the reaction more sufficient, as shown in Figure 1 , Figure 2 , Figure 3 , a plurality of material guiding assemblies 5 are arranged on the inner wall of the quartz tube body 1, and all the material guiding assemblies 5 are uniformly distributed on the circumference of the quartz tube body 1. The material guiding assemblies 5 stir the material in the quartz tube body 1, so as to further improve the contact area of the material. In order to improve the use effect of the material guiding assemblies 5, preferably, the material guiding assembly 5 comprises a connecting rod 51 and a material guiding plate 52. One end of the connecting rod 51 is connected with the inner wall of the quartz tube body 1, and the other end of the connecting rod 51 is connected with the material guiding plate 52. The material guiding plate 52 plays a main stirring role. The gap between the material guiding plate 52 and the inner wall of the quartz tube body 1 is provided, so that the molten material flows on the inner wall of the tube through the gap between the material guiding plate 52 and the inner wall of the quartz tube body 1 at high temperature, the contact area of the molten liquid and the atmosphere gas is expanded, and the reaction conversion efficiency is further improved.

[0036] In order to conveniently arrange the quartz tube body 1 in the furnace body, the quartz tube body 1 comprises a first small-diameter section 11, a large-diameter section 12 and a second small-diameter section 13 from left to right. The cross-sectional circular diameter of the large-diameter section 12 is greater than that of the first small-diameter section 11, the cross-sectional circular diameter of the first small-diameter section 11 is equal to that of the second small-diameter section 13, and the material guiding assembly 5 is arranged on the inner wall of the large-diameter section 12.

[0037] The gas participating in the reaction and the atmosphere is introduced into the quartz tube body 1 from the gas inlet assembly, in order to improve the use effect of the gas inlet assembly, preferably, one structure of the gas inlet assembly is as follows: Figure 1 As shown in the figure, the gas inlet assembly comprises a gas inlet 61, a gas inlet rotary joint 62 and a gas inlet pipe 63, the gas inlet 61 and the gas inlet pipe 63 are arranged on the gas inlet rotary joint 62, and the gas inlet pipe 63 can rotate in the gas inlet rotary joint 62, and the sealing performance of the gas inlet assembly can be improved by such arrangement. Figure 1 As shown in the figure, the gas outlet assembly comprises a gas outlet 71, a gas outlet rotary joint 72 and a gas outlet pipe 73, the gas outlet 71 and the gas outlet pipe 73 are arranged on the gas outlet rotary joint 72, and the gas outlet pipe 73 can rotate in the gas outlet rotary joint 72, and the sealing performance of the gas outlet assembly can be improved by such arrangement.

[0038] The rhodium powder dissolving method is carried out by using a tube furnace, the tube furnace comprises a furnace body and the quartz tube assembly structure for the tube furnace, at least one power transmission assembly is arranged in the furnace body, the quartz tube assembly structure is arranged in the furnace body, and one power transmission assembly is matched and connected with one rotary gear 4.

[0039] Preferably, the power transmission assembly comprises a motor, a transmission shaft and a transmission gear, the transmission shaft is connected with the output shaft of the motor, the transmission gear is arranged on the transmission shaft, the transmission gear is matched and connected with the rotary gear 4, during the reaction, the output shaft of the motor drives the transmission shaft to rotate, the transmission shaft drives the transmission gear to rotate, the transmission gear drives the rotary gear 4 to rotate, and the rotary gear 4 drives the quartz tube body 1 to rotate. In order to realize 360° continuous variable speed rotation of the quartz tube body, the motor is a variable frequency servo motor.

[0040] The dissolving method comprises the following steps:

[0041] S1: the rhodium powder and sodium chloride are subjected to particle refinement treatment respectively;

[0042] S2: firstly, the rhodium powder and sodium chloride subjected to the refinement treatment in step S1 are mixed according to a certain proportion, and then the mixed mixture is loaded into the quartz tube body 1 from the feeding port;

[0043] S3: the mixture is subjected to reaction in the tube furnace, during the reaction, the power transmission assembly is controlled to work, so that the quartz tube body (1) rotates around the horizontal center axis thereof;

[0044] S4: after the reaction is completed, the product in the tube furnace is transferred to a container after the tube furnace is cooled to room temperature, and a sodium hexachlororhodate solution is obtained by pure water leaching or dilute acid leaching.

[0045] In step S1, the particle size of the refined rhodium powder is ≤300 μm, and the particle size of the refined sodium chloride is ≤300 μm; in step S2, the mass ratio of the rhodium powder to the sodium chloride is 1:1-5.

[0046] In step S3, during the reaction, nitrogen is first introduced into the quartz tube body 1 through the gas inlet assembly, and the nitrogen is used as an atmosphere gas to avoid the direct reaction of chlorine with the rhodium powder at a low temperature to generate insoluble RhCl3, thereby reducing the conversion of the rhodium powder into soluble NaRhCl6, the nitrogen flow rate is 0-50 L / min, the nitrogen aeration time is 5-150 min, then chlorine is introduced into the quartz tube body 1 through the gas inlet assembly for reaction, the chlorine flow rate is 0-50 L / min, the chlorine aeration time is 5-300 min, the reaction is carried out in two temperature stages, the first-stage reaction temperature is 550 DEG C, the second-stage reaction temperature is 700 DEG C, and finally, after the reaction is completed, nitrogen is introduced into the quartz tube body 1 through the gas inlet assembly, and the nitrogen aeration time is 30-90 min.

[0047] In step S4, the leaching solution is at least one of deionized water, ultrapure water, dilute hydrochloric acid, and dilute sulfuric acid.

[0048] In order to improve the concentration of the sodium hexachlororhodate solution, the method further comprises step S5: filtering and washing the sodium hexachlororhodate solution in step S4, and the filtrate is a sodium hexachlororhodate solution with a higher concentration.

[0049] In summary, the quartz tube assembly structure for the tube furnace comprises at least one rotating gear 4 connected to the outer surface of the quartz tube body 1, and when the rhodium powder is dissolved by using the quartz tube assembly structure, at least one power transmission assembly is arranged in the furnace body of the tube furnace, the quartz tube assembly structure is arranged in the furnace body, and one power transmission assembly and one rotating gear are matched and connected together, so that the power transmission assembly can continuously rotate the quartz tube body at 360 DEG during the reaction, the mixture of the rhodium powder and the sodium chloride in the quartz tube body 1 is in a rotating and rolling state, which is beneficial to exposing more phase interfaces and active sites of the material under stirring, the material is wrapped by the atmosphere gas in a specific atmosphere gas, thereby effectively improving the reaction efficiency and the reaction is more complete, and the rhodium powder dissolution conversion rate is improved.

[0050] The rhodium powder dissolution method adopts the quartz tube assembly structure, the mixture of the rhodium powder and the sodium chloride in the quartz tube body 1 is in a rotating and rolling state during the reaction, the reaction efficiency is improved, the reaction is more complete, the one-time dissolution conversion rate of the rhodium powder is >96 %, which is much higher than the one-time dissolution conversion rate of the rhodium powder in the prior art by using the medium-temperature chlorination method, no other metal impurity elements are introduced, the batch production repeatability is high, the relative standard deviation of the repeated production is less than 0.9 %, and the method is beneficial to large-scale use.

[0051] Example 1 dissolving rhodium powder by the method of the present application

[0052] The specific operation steps are as follows:

[0053] Take 150 g of pure rhodium powder with purity ≥99.99%, the rhodium powder and sodium chloride are treated to have a particle size ≤75 μm (200 mesh) after being refined, mix them uniformly, transfer them to a tube furnace, and introduce chlorine gas to perform a staged reaction, the first stage reaction temperature is 550℃, and the temperature is kept constant for 2 hours, the second stage reaction temperature is 700℃, and the temperature is kept constant for 30 minutes, so that the rhodium powder is converted into soluble sodium hexachlororhodate, and then the soluble sodium hexachlororhodate is leached by ultrapure water, filtered and washed, the filtrate is 14.5 kg of 1% purity sodium hexachlororhodate solution, the filtrate contains 145 g of rhodium, and the one-time dissolution conversion rate is 96.7%.

[0054] Example 2 dissolving rhodium powder by the method of the present application

[0055] Take 100 g of pure rhodium powder with purity ≥99.99%, the rhodium powder and sodium chloride are treated to have a particle size ≤75 μm (200 mesh) after being refined, mix them uniformly, transfer them to a tube furnace, and introduce chlorine gas to perform a staged reaction, the first stage reaction temperature is 550℃, and the temperature is kept constant for 2 hours, the second stage reaction temperature is 700℃, and the temperature is kept constant for 30 minutes, so that the rhodium powder is converted into soluble sodium hexachlororhodate, and then the soluble sodium hexachlororhodate is leached by ultrapure water, filtered and washed, the filtrate is 12.4 kg of 0.79% purity sodium hexachlororhodate solution, the filtrate contains 97.96 g of rhodium, and the one-time dissolution conversion rate is 98.0%.

[0056] Example 3 dissolving rhodium powder by the method of the present application

[0057] The specific operation steps are as follows:

[0058] Take 100 g of pure rhodium powder with purity ≥99.99%, the rhodium powder and sodium chloride are treated to have a particle size ≤75 μm (200 mesh) after being refined, mix them uniformly, transfer them to a tube furnace, and introduce chlorine gas to perform a staged reaction, the first stage reaction temperature is 550℃, and the temperature is kept constant for 2 hours, the second stage reaction temperature is 700℃, and the temperature is kept constant for 30 minutes, so that the rhodium powder is converted into soluble sodium hexachlororhodate, and then the soluble sodium hexachlororhodate is leached by ultrapure water, filtered and washed, the filtrate is 13.0 kg of 0.75% purity sodium hexachlororhodate solution, the filtrate contains 97.5 g of rhodium, and the one-time conversion rate is 97.5%.

[0059] Example 4 dissolving rhodium powder by the method of the present application

[0060] The specific operation steps are as follows:

[0061] Rhodium powder with purity of 99.99% was weighed 90g, and the particle size of the rhodium powder and sodium chloride after refining was less than 75μm (200 mesh). The mixture was uniformly mixed and transferred to a tube furnace. Chlorine was introduced for staged reaction. The first stage reaction temperature was 550℃, and the constant temperature was maintained for 2h. The second stage reaction temperature was 700℃, and the constant temperature was maintained for 30min. The rhodium powder was converted into soluble sodium hexachlororhodate. Then, the solution was leached by ultrapure water, filtered and washed. The filtrate was 13.0kg of 0.67% purity sodium hexachlororhodate solution. The filtrate contained 87.1g of rhodium, and the one-time conversion rate was 96.8%.

Claims

1. A method for dissolving rhodium powder, said dissolving method being carried out using a tube furnace, characterized in that: The tube furnace comprises a furnace body and a quartz tube assembly structure for the tube furnace, the quartz tube assembly structure for the tube furnace comprises a quartz tube body (1), an air inlet assembly and an air outlet assembly, one end of the quartz tube body (1) is a feeding port, the other end of the quartz tube body (1) is a discharging port, a detachable air inlet sealing fluorine flange (2) is arranged at the feeding port, a detachable air outlet sealing fluorine flange (3) is arranged at the discharging port, the air inlet assembly is connected with the quartz tube body (1) in communication through the air inlet sealing fluorine flange (2), and the air outlet assembly is connected with the quartz tube body (1) in communication through the air outlet sealing fluorine flange (3), characterized in that at least one rotating gear (4) is arranged on the outer surface of the quartz tube body (1); A plurality of material guiding assemblies (5) are arranged on the inner wall of the quartz tube body (1), and all the material guiding assemblies (5) are uniformly distributed on the circumference of the quartz tube body (1); The material guiding assembly (5) comprises a connecting rod (51) and a material guiding plate (52), one end of the connecting rod (51) is connected with the inner wall of the quartz tube body (1), and the other end of the connecting rod (51) is connected with the material guiding plate (52); At least one power transmission assembly is arranged in the furnace body, and the quartz tube assembly structure is arranged in the furnace body, and one power transmission assembly is matched and connected with one rotating gear (4). The dissolving method comprises the following steps: S1: the rhodium powder and sodium chloride are respectively subjected to particle refinement treatment; S2: the rhodium powder and sodium chloride subjected to the refinement treatment in step S1 are mixed according to a certain proportion, and then the mixed material is loaded into the quartz tube body (1) from the feeding port; S3: the mixed material is subjected to reaction in the tube furnace, and during the reaction, the power transmission assembly is controlled to work, so that the quartz tube body (1) rotates around the horizontal center axis thereof; During the reaction, nitrogen is first introduced into the quartz tube body (1) through the air inlet assembly, the nitrogen flow rate is 0-50 L / min, the nitrogen flow rate does not include 0, the nitrogen aeration time is 5-150 min, then chlorine is introduced into the quartz tube body (1) through the air inlet assembly for reaction, the chlorine flow rate is 0-50 L / min, the chlorine flow rate does not include 0, the chlorine aeration time is 5-300 min, and finally after the reaction is completed, nitrogen is introduced into the quartz tube body (1) through the air inlet assembly, and the nitrogen aeration time is 30-90 min; S4: after the reaction is completed, the product in the tube furnace is transferred to a container, and a sodium hexachlororhodate solution is obtained through pure water or dilute acid leaching.

2. The method of dissolving rhodium powder according to claim 1, wherein: In step S1, the particle size of the rhodium powder subjected to the refinement treatment is ≤300 µm, and the particle size of the sodium chloride subjected to the refinement treatment is ≤300 µm. In step S2, the mass ratio of the rhodium powder to the sodium chloride is 1:1-5.

3. The method of claim 1, wherein the rhodium powder is dissolved by: The number of the rotating gears (4) is two, and the two rotating gears (4) are respectively located on the two sides of the quartz tube body (1).

4. The method of claim 1, wherein the rhodium powder is dissolved. The quartz tube body (1) is sequentially provided with a first small-diameter section (11), a large-diameter section (12) and a second small-diameter section (13) from left to right, the cross-sectional circle diameter of the large-diameter section (12) is greater than that of the first small-diameter section (11), and the cross-sectional circle diameter of the first small-diameter section (11) is equal to that of the second small-diameter section (13); The material guiding assembly (5) is arranged on the inner wall of the large-diameter section (12).

5. The method of claim 1, wherein the rhodium powder is dissolved by: The air inlet assembly comprises an air inlet (61), an air inlet rotary joint (62) and an air inlet pipe (63), the air inlet (61) and the air inlet pipe (63) are arranged on the air inlet rotary joint (62), and the air inlet pipe (63) can rotate in the air inlet rotary joint (62); The air outlet assembly comprises an air outlet (71), an air outlet rotary joint (72) and an air outlet pipe (73), the air outlet (71) and the air outlet pipe (73) are arranged on the air outlet rotary joint (72), and the air outlet pipe (73) can rotate in the air outlet rotary joint (72).

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