Method and device for alkali fusion continuous production in zirconium industry

Abstract

The invention belongs to the technical field of zirconium oxychloride preparation, and relates to a method and device for alkali fusion continuous production in the zirconium industry, and the method comprises the following steps: in a closed space, adding a certain amount of alkali metal hydroxide into an alkali fusion pan, preheating for 10-20 minutes at 350-450 DEG C, then heating for 10-40 minutes at 550-650 DEG C, and then cooling to room temperature to obtain the zirconium oxychloride. The method comprises the following steps of: adding zircon sand into an alkali fusion pot according to the ore-alkali mass ratio of 1: (1.2-1.5), adding the zircon sand for 10-20 minutes, keeping the temperature at 600-650 DEG C for 20-60 minutes, and finally cooling the alkali fusion pot to 50 DEG C within 120-240 minutes. The device comprises a tunnel kiln, and a preheating section, a heating section, a feeding section, a heat preservation section and a cooling section are arranged in the tunnel kiln. According to the invention, the labor intensity of workers can be reduced, the working environment can be improved, and the production efficiency and the zircon sand conversion rate can be improved.

Description

Technical Field

[0001] The invention belongs to the technical field of zirconium oxychloride preparation, and in particular, relates to a method and a device for continuous alkali fusion production of zirconium industry. Background Art

[0002] The main chemical composition of zircon sand is orthosilicate (ZrSiO4), which usually coexists with ilmenite and rutile in nature. Zircon sand concentrate is separated by magnetic separation, gravity separation, jigging and electrostatic separation to obtain zircon sand. Zirconium oxychloride produced from zircon sand is a promising chemical intermediate. It can be used as a raw material for zirconium and hafnium separation, and can produce zirconium alloys and hafnium alloys for nuclear reactor envelope materials. It is also a raw material for cutting tools, functional ceramics, catalysts, zirconium dioxide, and a series of materials such as zirconium carbonate, zirconium sulfate, and zirconium nitrate.

[0003] Alkali fusion is the starting point of zirconium oxychloride production. Before this, the production environment of alkali fusion can be summarized as "dirty, messy, poor and small". "Dirty" refers to the use of coal in alkali fusion, which causes a large amount of dust to fill the workshop, and the working environment is not optimistic; "messy" refers to the fact that alkali fusion was previously produced in the open air, the alkali fusion pots were placed randomly, natural air cooling was used, and the production workshop layout was chaotic; "poor" refers to the fact that alkali fusion was previously open-air, requiring a large amount of heat, and the conversion rate of zircon sand was not high; "small" refers to the fact that the alkali fusion output was small, natural cooling was used, the level of automation was low, and it needed to stand still for 12 hours before the next operation could be carried out.

[0004] Therefore, the art urgently needs to develop a method for continuous alkali fusion production of zirconium industry that can reduce manual labor intensity, improve the working environment, and improve production efficiency and zircon sand conversion rate. Summary of the invention

[0005] The purpose of the present invention is to provide a method and device for continuous alkali fusion production of zirconium industry which can reduce the labor intensity, improve the working environment, and improve the production efficiency and the conversion rate of zircon sand.

[0006] In order to achieve one of the above purposes, the present invention adopts the following technical solution:

[0007] A method for continuous alkali fusion production of zirconium industry, comprising the following steps:

[0008] In a closed space, a certain amount of alkali metal hydroxide is added to the alkali melting pot, preheated at 350-450°C for 10-20 minutes, then heated at 550-650°C for 10-40 minutes, then zircon sand is added to the alkali melting pot according to the mass ratio of ore to alkali of 1:1.2-1.5, and the feeding time of zircon sand is 10-20 minutes, then kept at 600-650°C for 20-60 minutes, and finally the temperature of the alkali melting pot is cooled to 50°C within 120-240 minutes. This method is helpful to realize environmentally friendly and efficient zircon sand alkali melting operation, and can improve the conversion rate of zircon sand.

[0009] Preferably, the alkali metal hydroxide is sodium hydroxide or potassium hydroxide, which is used as an alkali melting decomposition agent.

[0010] Preferably, air cooling is used for cooling, which can greatly shorten the cooling time and improve production efficiency.

[0011] In order to achieve another object of the present invention, a device for continuous alkali fusion production in the zirconium industry is proposed, which is used to realize the above-mentioned method for continuous alkali fusion production in the zirconium industry, including a tunnel kiln, wherein the tunnel kiln is provided with a preheating section, a heating section, a feeding section, a heat preservation section and a cooling section, the preheating section is provided with an alkali addition port, the feeding section is provided with an ore feeding port, the tunnel kiln is provided with a kiln track and a kiln car that can travel on the kiln track and pass through the preheating section, the heating section, the feeding section, the heat preservation section and the cooling section in sequence, an alkali melting pot is movably placed on the kiln car; the outer side of the tunnel kiln is provided with an outer kiln track connected to the inner kiln track, the outer kiln track includes a kiln exit track and a return track, and a loading and unloading area is provided between the kiln exit track and the return track.

[0012] Preferably, the alkali melting pot is made of carbon manganese steel material, which has good high temperature resistance and thermal stability, a hemispherical structure at the bottom, more uniform heating, and a higher alkali melting conversion rate.

[0013] Preferably, the kiln car is electrically driven and remotely controlled to achieve automated control, thereby greatly reducing labor input and improving operating efficiency.

[0014] Preferably, the heating section is provided with a plurality of natural gas isothermal flat flame burners, and the alkali melting pot is heated by an open flame. The kiln body of the present invention adopts a closed space and uses natural gas as fuel, which can avoid the generation of a large amount of dust and is conducive to the recovery of a large amount of heat.

[0015] Preferably, a waste heat recovery port is provided on the kiln body of the tunnel kiln, through which the high-temperature flue gas in the tunnel kiln can be connected to the waste heat boiler for waste heat recovery.

[0016] Preferably, the loading and unloading area is provided with a trolley, by which the alkali melting pot on the kiln car on the kiln exit track can be unloaded, and the alkali melting pot after unloading can also be placed back into the kiln car on the return track.

[0017] Preferably, the cooling section is provided with a plurality of blowers, which can greatly shorten the cooling time and improve production efficiency.

[0018] The present invention also includes other devices or components that enable it to be used normally, which are all conventional technical means in the field; in addition, the devices, components or steps not limited in the present invention all adopt conventional means in the field and will not be described in detail here.

[0019] The working principle of the present invention is: the present invention meteredly adds alkali metal hydroxide through the alkali feeding port through one side of the kiln body of the tunnel kiln, and after passing through the preheating section and the heating section, it is heated to the reaction temperature, and then meteredly adds zircon sand from the other side of the kiln body of the tunnel kiln. The kiln body adopts a closed space and uses natural gas as fuel to avoid generating a large amount of dust, and a large amount of heat can be recovered. The present invention adopts an electric drive kiln car, and the alkali melting pot is neatly placed on the kiln car. Through the design of preheating, heating, heat preservation and cooling sections, uninterrupted continuous production can be achieved. By arranging a blower in the cooling section of the kiln body, the cooling time can be greatly shortened and the production efficiency can be improved.

[0020] The beneficial effects of the present invention are as follows: the present invention can reduce the intensity of manual labor, be beneficial to improving the working environment, and can improve the production efficiency and the conversion rate of zircon sand. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0022] Figure 1 Schematic diagram of the overall structure of the tunnel kiln of the present invention in the embodiment.

[0023] Figure 2 Schematic diagram of the top view of the tunnel kiln of the present invention in the embodiment. DETAILED DESCRIPTION

[0024] The present invention is described clearly below in conjunction with the drawings and specific embodiments in the embodiments of the present invention. The description herein is only used to explain the present invention, but is not intended to limit the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work, any modifications, equivalent substitutions, improvements, etc., should be included in the protection scope of the present invention.

[0025] Example 1

[0026] This embodiment proposes a method for continuous alkali fusion production of zirconium industry, comprising the following steps:

[0027] In a closed space, sodium hydroxide was added to the alkali melting pot according to the mineral-alkali ratio of 1:1.2, preheated at 350°C for 10 minutes, then heated at 550°C for 10 minutes, and then zircon sand was added to the alkali melting pot, and the zircon sand addition time was 10 minutes, then kept warm at 600°C for 20 minutes, and finally the temperature of the alkali melting pot was cooled to 50°C within 120 minutes. Air cooling was adopted for cooling. The conversion rate of zircon sand was tested to be 97.1%.

[0028] Example 2

[0029] This embodiment proposes a method for continuous alkali fusion production of zirconium industry, comprising the following steps:

[0030] In a closed space, sodium hydroxide was added to the alkali melting pot according to the mineral-alkali ratio of 1:1.3, preheated at 400°C for 10 minutes, then heated at 600°C for 20 minutes, and then zircon sand was added to the alkali melting pot, and the zircon sand addition time was 20 minutes, then kept warm at 620°C for 20 minutes, and finally the temperature of the alkali melting pot was cooled to 50°C within 160 minutes. Air cooling was adopted for cooling. The conversion rate of zircon sand was tested to be 97.5%.

[0031] Example 3

[0032] This embodiment proposes a method for continuous alkali fusion production of zirconium industry, comprising the following steps:

[0033] In a closed space, sodium hydroxide was added to the alkali melting pot according to the mineral-alkali ratio of 1:1.4, preheated at 450°C for 20 minutes, then heated at 650°C for 30 minutes, and then zircon sand was added to the alkali melting pot, and the zircon sand addition time was 10 minutes, then kept warm at 650°C for 40 minutes, and finally the temperature of the alkali melting pot was cooled to 50°C within 200 minutes. Air cooling was adopted for cooling. The conversion rate of zircon sand was tested to be 98.1%.

[0034] Example 4

[0035] This embodiment proposes a method for continuous alkali fusion production of zirconium industry, comprising the following steps:

[0036] In a closed space, sodium hydroxide was added into the alkali melting pot according to the mineral-alkali ratio of 1:1.5, preheated at 450°C for 20 minutes, then heated at 650°C for 40 minutes, and then zircon sand was added into the alkali melting pot, and the zircon sand addition time was 10 minutes, then kept warm at 650°C for 60 minutes, and finally the temperature of the alkali melting pot was cooled to 50°C within 240 minutes. Air cooling was adopted for cooling. The conversion rate of zircon sand was found to be 98.1%.

[0037] Example 5

[0038] This embodiment proposes a method for continuous alkali fusion production of zirconium industry, comprising the following steps:

[0039] In a closed space, potassium hydroxide was added to the alkali melting pot according to the mineral-alkali ratio of 1:1.2, preheated at 350°C for 10 minutes, then heated at 550°C for 10 minutes, and then zircon sand was added to the alkali melting pot, and the zircon sand addition time was 10 minutes, then kept warm at 600°C for 20 minutes, and finally the temperature of the alkali melting pot was cooled to 50°C within 120 minutes. Air cooling was adopted for cooling. The conversion rate of zircon sand was tested to be 96.5%.

[0040] Example 6

[0041] This embodiment proposes a method for continuous alkali fusion production of zirconium industry, comprising the following steps:

[0042] In a closed space, potassium hydroxide was added to the alkali melting pot according to the mineral-alkali ratio of 1:1.3, and preheated at 400°C for 10 minutes, then heated at 600°C for 20 minutes, and then zircon sand was added to the alkali melting pot, and the zircon sand was added for 20 minutes, and then kept warm at 620°C for 30 minutes. Finally, the temperature of the alkali melting pot was cooled to 50°C within 160 minutes. Air cooling was adopted for cooling. The conversion rate of zircon sand was tested to be 96.8%.

[0043] Example 7

[0044] This embodiment proposes a method for continuous alkali fusion production of zirconium industry, comprising the following steps:

[0045] In a closed space, potassium hydroxide was added to the alkali melting pot according to the mineral-alkali ratio of 1:1.4, preheated at 450°C for 20 minutes, then heated at 650°C for 30 minutes, and then zircon sand was added to the alkali melting pot, and the zircon sand addition time was 10 minutes, then kept warm at 650°C for 40 minutes, and finally the temperature of the alkali melting pot was cooled to 50°C within 200 minutes. Air cooling was adopted for cooling. The conversion rate of zircon sand was tested to be 97.9%.

[0046] Example 8

[0047] This embodiment proposes a method for continuous alkali fusion production of zirconium industry, comprising the following steps:

[0048] In a closed space, potassium hydroxide was added into the alkali melting pot according to the mineral-alkali ratio of 1:1.5, and preheated at 450°C for 20 minutes, then heated at 650°C for 40 minutes, and then zircon sand was added into the alkali melting pot, and the zircon sand addition time was 10 minutes, and then kept warm at 650°C for 60 minutes. Finally, the temperature of the alkali melting pot was cooled to 50°C within 240 minutes. Air cooling was adopted for cooling. The conversion rate of zircon sand was found to be 98.2%.

[0049] Example 9

[0050] like Figures 1-2 As shown, this embodiment proposes a device for continuous alkali melting production in the zirconium industry, including a tunnel kiln, wherein the tunnel kiln is provided with a preheating section, a heating section, a feeding section, a heat preservation section and a cooling section, wherein the preheating section is provided with an alkali addition port 2, and the feeding section is provided with an ore feeding port 3. The tunnel kiln is provided with a kiln track and a kiln car 5 that can travel on the kiln track and pass through the preheating section, the heating section, the feeding section, the heat preservation section and the cooling section in sequence, and an alkali melting pot 1 is movably placed on the kiln car; the outer side of the tunnel kiln is provided with a kiln outer track that is connected to the kiln inner track, and the kiln outer track includes a kiln exit track and a return track, and a loading and unloading area 6 is provided between the kiln exit track and the return track.

[0051] Specifically, the alkali melting pot is made of carbon manganese steel material, has good high temperature resistance, thermal stability, bottom hemispherical structure, more uniform heating, and higher alkali melting conversion rate. The kiln car is driven by electricity and remotely controlled by remote control to achieve automatic control, thereby greatly reducing labor input and improving work efficiency. The heating section is provided with a number of natural gas isothermal flat flame burners 8, and the alkali melting pot is heated by an open flame naked flame. The kiln body of the present invention adopts a closed space and uses natural gas as fuel, which can avoid the generation of a large amount of dust and is conducive to the recovery of a large amount of heat. The kiln body of the tunnel kiln is provided with a waste heat recovery port 4, through which the high-temperature flue gas in the tunnel kiln can be connected to the waste heat boiler for waste heat recovery. The loading and unloading area is provided with a trolley 9, through which the alkali melting pot on the kiln car on the kiln track can be unloaded, and the unloaded alkali melting pot can also be placed back in the kiln car on the return track. The cooling section is provided with a number of blowers 7, which can greatly shorten the cooling time and improve production efficiency.

[0052] The present invention adds alkali metal hydroxide through the alkali feeding port on one side of the kiln body of the tunnel kiln, and after passing through the preheating section and the heating section, heats to the reaction temperature, and then adds zircon sand from the other side of the kiln body of the tunnel kiln. The kiln body adopts a closed space and uses natural gas as fuel to avoid generating a large amount of dust, and a large amount of heat can be recovered. The present invention uses an electric drive kiln car, and the alkali melting pot is neatly placed on the kiln car. Through the design of preheating, heating, heat preservation and cooling sections, uninterrupted continuous production can be achieved. By arranging a blower in the cooling section of the kiln body, the cooling time can be greatly shortened and the production efficiency can be improved.

[0053] The embodiments of the present invention have been described above, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments.

Claims

1. A method for continuous alkali fusion production of zirconium industry, characterized in that: The steps include: In a closed space, a certain amount of alkali metal hydroxide is added to the alkali melting pot, preheated at 350-450°C for 10-20 minutes, then heated at 550-650°C for 10-40 minutes, and then zircon sand is added to the alkali melting pot in a ratio of 1:1.2-1.5 of mineral alkali mass ratio, and the zircon sand is added for 10-20 minutes, then kept warm at 600-650°C for 20-60 minutes, and finally the temperature of the alkali melting pot is cooled to 50°C within 120-240 minutes.

2. The method for continuous alkali fusion production of zirconium industry according to claim 1, characterized in that: The alkali metal hydroxide is sodium hydroxide or potassium hydroxide.

3. The method for continuous alkali fusion production of zirconium industry according to claim 1, characterized in that: The cooling method is air cooling.

4. A device for continuous alkali fusion production of zirconium industry, used to implement the method for continuous alkali fusion production of zirconium industry as claimed in any one of claims 1 to 3, characterized in that: The invention comprises a tunnel kiln, wherein a preheating section, a heating section, a feeding section, a heat preservation section and a cooling section are arranged in the tunnel kiln, wherein the preheating section is provided with an alkali adding port, wherein the feeding section is provided with an ore feeding port, wherein a kiln track and a kiln car which can travel on the kiln track and sequentially pass through the preheating section, the heating section, the feeding section, the heat preservation section and the cooling section are arranged in the tunnel kiln, wherein an alkali melting pot is movably placed on the kiln car; an outer kiln track which is connected with the inner kiln track is arranged on the outer side of the tunnel kiln, wherein the outer kiln track comprises a kiln exit track and a return track, and a loading and unloading area is arranged between the kiln exit track and the return track.

5. The device for continuous alkali fusion production of zirconium industry according to claim 4, characterized in that: The alkali melting pot is made of carbon manganese steel material and has a hemispherical bottom structure.

6. The device for continuous alkali fusion production of zirconium industry according to claim 4, characterized in that: The kiln car is electrically driven and remotely controlled.

7. The device for continuous alkali fusion production of zirconium industry according to claim 4, characterized in that: The heating section is provided with a plurality of natural gas isothermal flat flame burners, and the alkali melting pot is heated by an open flame naked flame.

8. The device for continuous alkali fusion production of zirconium industry according to claim 4, characterized in that: A waste heat recovery port is provided on the kiln body of the tunnel kiln.

9. The device for continuous alkali fusion production of zirconium industry according to claim 4, characterized in that: The loading and unloading area is provided with a navigation vehicle.

10. The device for continuous alkali fusion production of zirconium industry according to claim 4, characterized in that: The cooling section is provided with a plurality of blowers.

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