Beryllium-containing material treatment method and system

Abstract

The invention discloses a beryllium-containing material treatment method and system, aiming at the component characteristics of a beryllium-containing material, a two-stage treatment mode of drying and roasting is adopted, the energy consumption of the system is reduced, the phase conversion efficiency can be obviously improved, and the yield of a target oxidation product is improved. Meanwhile, the hydrogen-containing fuel is pretreated to serve as the heat supply fuel for drying and roasting the beryllium-containing material, and compared with existing fossil energy, the emission amount of carbon dioxide can be remarkably reduced, and green production is achieved. The method is short in process and easy to control, and the provided matched heat treatment system is simple in structure, easy to operate and convenient for large-scale popularization and application and has excellent market potential.

Description

Technical Field

[0001] The invention relates to the processing and treatment of beryllium-containing materials, and in particular to a method and system for treating beryllium-containing materials, belonging to the technical field of processing and treatment of beryllium-containing materials. Background Art

[0002] Beryllium oxide is a good refractory material with a high melting point (above 2500℃) and good chemical stability. Its thermal conductivity is better than some metals and better than any non-metal. Therefore, refractory ceramic materials made of it have high thermal shock resistance. These materials can be used to make crucibles for melting special metals, special thermocouples, protective sleeves and nozzles for rocket combustion chambers. Because beryllium oxide has good thermal conductivity and low thermal expansion coefficient, as well as electrical insulation, it is widely used in the electronics industry, mainly for the manufacture of insulating heat sinks in electron tubes and transistors. The use of such heat sinks can increase output power and achieve miniaturization. The use of beryllium oxide base plates in large-scale integrated circuits is increasing. In addition, it has a low nuclear cross section and good deceleration performance for neutrons. Therefore, beryllium oxide can be used to build high-temperature nuclear reactors.

[0003] In industry, Be(OH)2 is generally converted into BeO products by high-temperature roasting. At present, coal, electricity or natural gas are often used for heating. Wet hydroxide beryllium is dried, calcined and cooled in tunnel kilns / rotary kilns to obtain industrial beryllium oxide, accompanied by a large amount of CO2 emissions. Hydrogen is a recognized excellent reducing agent and clean fuel. Replacing carbon-containing fuels with hydrogen is an important direction for low-carbon green development in the metallurgical and chemical industries. Summary of the invention

[0004] In view of the problem of large carbon emissions in the existing beryllium oxide roasting preparation technology using fossil energy for heating, the present invention uses hydrogen-containing gas as heating fuel, and treats the beryllium-containing material in two stages (i.e., drying + roasting) based on the combustion characteristics of hydrogen and the conversion characteristics of beryllium-containing materials. On the premise of meeting the heat required for the two-stage treatment of beryllium oxide, the carbon emissions are significantly reduced, and the yield of beryllium oxide can also be significantly improved. In addition, by premixing with oxygen-containing gas before combustion, the uniformity of mixing with oxygen is improved, and the combustion efficiency is improved by ensuring that the oxygen required for the complete combustion of hydrogen is sufficient.

[0005] In order to achieve the above technical objectives, the technical solutions adopted by the present invention are as follows: According to a first embodiment of the present invention, a method for treating a beryllium-containing material is provided: A method for processing a beryllium-containing material, the method comprising the following steps: S1: placing the beryllium-containing material in a roasting furnace, then premixing the hydrogen-containing gas and the oxygen-containing gas and then inputting them into a drying roasting furnace for combustion and heat supply, and drying the beryllium-containing material first to obtain a beryllium-containing dry material.

[0006] S2: After the drying process is completed, the input amounts of hydrogen-containing gas and oxygen-containing gas are increased simultaneously to perform roasting process on the beryllium-containing dry material to obtain a beryllium-containing oxide material.

[0007] Preferably, in step S1, the hydrogen-containing gas is composed of hydrogen and one or more of carbon monoxide, natural gas, and nitrogen. The hydrogen concentration in the hydrogen-containing gas is not less than 50%, and preferably the hydrogen concentration in the hydrogen-containing gas is 60-90% (referring to the volume concentration).

[0008] Preferably, in step S1, the oxygen concentration in the oxygen-containing gas is not less than 20% (referring to volume concentration), and preferably the oxygen-containing gas is air.

[0009] Preferably, in step S1, the temperature of the drying treatment is not higher than 600° C., preferably 300-500° C. The duration of the drying treatment is 0.5-6 hours, preferably 1-5 hours.

[0010] Preferably, in step S2, the temperature of the calcination treatment is not less than 700° C., preferably 800-1200° C. The duration of the calcination treatment is 1-5 hours, preferably 2-4 hours.

[0011] Preferably, in step S1 and step S2, under the premise of meeting the current working condition requirements (i.e., meeting the thermal mining requirements for drying and roasting, respectively), the amount of hydrogen-containing gas and oxygen-containing gas introduced is controlled so that the volume of the introduced hydrogen gas accounts for a proportion of the total volume of the mixed gas obtained by mixing the hydrogen-containing gas and the oxygen-containing gas less than 29.5%, preferably 4-29%, and further preferably any one of 6-26%, 8-24%, 10-22%, 12-18%, and 14-16, for example, 4%, 4.5%, 5%, 5.5%, 6%, 6.5%, 7%, 7.5%, 8%, 8.5%, 9%, 10%, 11%, 12%, 13%, 14%, 15%, 16%, 18%, 20%, 22%, 24%, 26%, 28%, and 29%.

[0012] Preferably, the beryllium-containing material is a solid material containing beryllium hydroxide, and its particle size is not greater than 1 mm, preferably 0.1-0.3 mm.

[0013] Preferably, the mass content of beryllium hydroxide in the beryllium-containing material is not less than 30%, preferably not less than 50%, and more preferably not less than 80%.

[0014] Preferably, the beryllium oxide-containing material is a solid material containing beryllium oxide.

[0015] According to a second embodiment of the present invention, a system for processing beryllium-containing materials is provided: A processing system for beryllium-containing materials or a processing system for the method described in the first embodiment, the processing system includes a drying and roasting furnace and a hydrogen-containing fuel premixing mechanism, the drying and roasting furnace includes a furnace body and a furnace, the front end of the furnace body is independently provided with a material inlet, a hydrogen-containing fuel inlet and an oxygen supplementation port, and the rear end of the furnace body is provided with a flue gas outlet and a material outlet. The furnace is connected to the discharge end of the hydrogen-containing fuel premixing mechanism through the hydrogen-containing fuel inlet. A hydrogen concentration detector is also provided at the hydrogen-containing fuel inlet. An electric heating device is also provided in the furnace. Preferably, a plurality of thermocouples are also provided in the furnace.

[0016] Preferably, the hydrogen-containing fuel premixing mechanism comprises an air delivery pipe and a plurality of expansion joints arranged at intervals on the air delivery pipe, and an air intake pipe is independently arranged on each expansion joint. The air intake end of the air delivery pipe is connected to the hydrogen source, and the exhaust end thereof is connected to the hydrogen-containing fuel inlet.

[0017] Preferably, the volume of the inner cavity of the expansion joint increases successively along the direction of the airflow, and a gas component concentration detector is independently provided in the inner cavity of each expansion joint.

[0018] Preferably, at least one swirler is independently arranged in the air delivery pipe at any expansion joint exhaust port. Preferably, the swirler is a swirl blade.

[0019] In the present invention, the beryllium in the beryllium-containing material is mainly present in the form of beryllium hydroxide (Be(OH)2), and may also contain a certain amount of beryllium sulfate (BeSO4) and a large amount of water (including crystal water and adsorbed water). The beryllium-containing material is roasted and thermally decomposed to obtain beryllium oxide, and the reaction process is roughly as follows: Be(OH)2→BeO+H2O(g)↑ BeSO4·Be(OH)2·xH2O→2BeO+SO3↑+(x+1)H2O(g)↑ The decomposition reaction of Be(OH)2 is an endothermic reaction, and the increase in temperature is conducive to the forward reaction. It has been found in practice that beryllium-containing materials generally contain about 20~25% adsorbed water and 25~30% crystallization water, while Be(OH)2 accounts for about 40~55%. According to the mass ratio, it can be inferred that every 1 mol of Be(OH)2 contains about 1.38 mol of crystallization water, that is, the chemical formula of the beryllium-containing material can be expressed as Be(OH)2·1.38H2O. In other words, it is necessary to remove the adsorbed water and crystallization water first in terms of kinetics, and then the decomposition reaction of Be(OH)2 can occur at a higher temperature. The adsorbed water is free outside the crystal and is lost when heated to about 100°C; while the crystallization water is within the unit cell and generally needs to be heated to about 300°C before it loses water. Therefore, in the present invention, the heat treatment of the beryllium-containing material is divided into two stages: drying and calcining. That is, in the drying stage, the input amount of the hydrogen-containing gas is controlled so that the heat released by its combustion can meet the removal of adsorbed water and crystallized water in the beryllium-containing material. That is, the volatilization of adsorbed water and crystallized water mainly occurs in the drying process. The longer the drying time and the higher the temperature, the more water evaporates, and the smoother the surface of the Be(OH)2 particles, but the physical phase does not change. It has been experimentally verified that when the drying temperature is about 400-500°C and the drying time is 2-4h, the basic removal of adsorbed water and crystallized water can be achieved well.

[0020] In the present invention, after the adsorbed water and crystal water are basically removed, the system temperature is increased by increasing the input of hydrogen-containing gas and oxygen-containing gas to roast the dried beryllium-containing material. The roasting process mainly decomposes Be(OH)2 to generate BeO. The longer the roasting time and the higher the temperature, the greater the degree of decomposition, the greater the degree of transformation of the physical phase Be(OH)2 into BeO, and the more serious the particle breakage. Experimental verification has found that when the roasting temperature is about 900~1000℃ and the roasting time is 2~4h, the complete decomposition of Be(OH)2 can be better achieved. It should be noted that the present invention is beneficial to significantly reduce the water partial pressure in the system during the subsequent roasting process by pre-removing the water in the beryllium-containing material, which is beneficial to the forward reaction, and can significantly improve the conversion rate of BeO, significantly improve the roasting yield, and also shorten the roasting time, save energy and improve production efficiency.

[0021] In the present invention, hydrogen is used as fuel for heating, which can significantly reduce carbon dioxide emissions compared to fossil energy (including coal, natural gas, etc.), and achieve green production. It should be noted that according to the chemical reaction equation of H2 combustion, it can be concluded that the molar ratio of H2 to O2 is 2:1, that is, the flow rate of O2 must be greater than 0.5 times the flow rate of H2 to meet the conditions for complete combustion of H2. Therefore, in the present invention, by premixing the hydrogen-containing gas with the oxygen-containing gas before combustion, and controlling the mixing ratio of hydrogen and oxygen, the hydrogen is fully mixed with the oxygen before combustion and the amount of oxygen can fully meet the complete combustion of the contained hydrogen, which is conducive to improving the thermal efficiency of the system.

[0022] In the present invention, a hydrogen-containing fuel premixing mechanism is used to achieve premixing of hydrogen-containing gas and oxygen-containing gas (preferably air). The hydrogen-containing fuel premixing mechanism mainly includes a gas pipeline and a plurality of expansion joints arranged at intervals on the gas pipeline. An air intake pipe is independently arranged on each expansion joint. The hydrogen-containing gas enters the first expansion joint through the air intake end of the gas pipeline, and a certain amount of air is added through the air intake pipe on the expansion joint to achieve the first premixing and dilution of the hydrogen-containing gas and part of the air. After that, the hydrogen-containing gas and the air are premixed multiple times through the second expansion joint, the third expansion joint, and even more expansion joints, etc., until the volume concentration of hydrogen in the mixed atmosphere of the hydrogen-containing gas and the air meets the working condition requirements. It should be noted that in the final mixed atmosphere, the oxygen content must meet the requirements for complete combustion of all hydrogen. In addition, in order to improve the mixing degree of hydrogen-containing gas and air, at least one swirler is independently arranged in the gas pipe at the exhaust port of each expansion joint (that is, according to the direction of the air flow, swirl blades are arranged in the gas pipe cavity between any two adjacent expansion joints and downstream of the last expansion joint), and the mixed gas is enhanced and mixed after each premixing through the swirler.

[0023] Furthermore, a gas component concentration detector is independently provided in the inner cavity of each expansion joint, and the hydrogen content and oxygen content in the mixed atmosphere after each premixing are detected by the gas component concentration detector, so as to provide a reference basis for adjusting the input amount of air for the next premixing, so as to ensure that the hydrogen concentration and oxygen concentration in the final mixed atmosphere meet the requirements of the current working conditions. Furthermore, a hydrogen concentration detector is also provided at the inlet of the hydrogen-containing fuel, and an oxygen supply port is additionally provided. The hydrogen-containing fuel (i.e., the mixed gas composed of hydrogen-containing gas and oxygen-containing gas) entering the drying and roasting furnace is finally tested for hydrogen concentration by the hydrogen concentration detector, and it is decided whether to open the oxygen supply port for oxygen supply according to the test result (i.e., when the hydrogen concentration is detected to be too high, high-concentration oxygen or air can be supplemented through the oxygen supply port; if the hydrogen concentration is too low, the input amount of hydrogen-containing gas is increased or the input amount of oxygen-containing gas during the premixing in the front stage is reduced) to ensure that the hydrogen concentration does not exceed the standard and avoid heat waste.

[0024] In the present invention, an electric heating device (such as a graphite electrode) is also provided in the furnace, and the electric heating device is provided to provide heat at the beginning of the process so that the input hydrogen is burned (i.e., it plays the role of ignition); in addition, it can also be provided as an independent ignition burner. Furthermore, an open flue gas outlet is provided at one end of the furnace away from the fuel material inlet (i.e., the rear end of the furnace), so that the furnace is in a non-sealed state, which can further ensure the safety of system operation.

[0025] Compared with the prior art, the beneficial technical effects of the present invention are as follows: 1: The treatment method of the beryllium-containing material of the present invention performs targeted pretreatment according to the combustion characteristics of hydrogen, so that hydrogen can replace the existing fossil energy as the heating fuel for the drying and roasting treatment of the beryllium-containing material, which can significantly reduce the emission of carbon dioxide and realize green production.

[0026] 2: The treatment method of the beryllium-containing material of the present invention adopts a two-stage treatment method of drying + roasting according to the composition characteristics of the beryllium-containing material. While reducing the energy consumption of the system, it can also significantly improve the phase conversion efficiency and increase the yield of the target oxidation product.

[0027] 3: The method of the present invention has a short process and is easy to control. The supporting device system provided has a simple structure and is easy to operate, which is convenient for large-scale promotion and application and has excellent market potential. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 The figure is a process flow chart of the treatment method of the present invention.

[0029] Figure 2 This is the SEM image of the beryllium-containing material described in Application Example 1.

[0030] Figure 3 This is a SEM image of the beryllium oxide material obtained in Application Example 1.

[0031] Figure 4 It is a schematic diagram of the structure of the processing system of the present invention.

[0032] Figure numerals: 1: drying and roasting furnace; 101: furnace body; 102: furnace chamber; 103: material inlet; 104: hydrogen-containing fuel inlet; 105: oxygen supply port; 106: flue gas outlet; 107: material outlet; 108: hydrogen concentration detector; 109: electric heating device; 110: thermocouple; 2: hydrogen-containing fuel premixing mechanism; 201: gas pipeline; 202: expansion joint; 203: air inlet pipe; 204: gas component concentration detector; 205: cyclone. DETAILED DESCRIPTION

[0033] The technical solution of the present invention is illustrated below by way of example, and the scope of protection requested by the present invention includes but is not limited to the following embodiments.

[0034] A processing system for beryllium-containing materials, the processing system comprises a drying and roasting furnace 1 and a hydrogen-containing fuel premixing mechanism 2, the drying and roasting furnace 1 comprises a furnace body 101 and a furnace 102, a material inlet 103, a hydrogen-containing fuel inlet 104 and an oxygen supplementation port 105 are independently opened at the front end of the furnace body 101, and a flue gas outlet 106 and a material outlet 107 are opened at the rear end of the furnace body 101. The furnace 102 is connected to the discharge end of the hydrogen-containing fuel premixing mechanism 2 through the hydrogen-containing fuel inlet 104. A hydrogen concentration detector 108 is also provided at the hydrogen-containing fuel inlet 104. An electric heating device 109 is also provided in the furnace 102. Preferably, a plurality of thermocouples 110 are also provided in the furnace 102.

[0035] Preferably, the hydrogen-containing fuel premixing mechanism 2 comprises an air delivery pipe 201 and a plurality of expansion joints 202 arranged at intervals on the air delivery pipe 201, and an air intake pipe 203 is independently arranged on each expansion joint 202. The air intake end of the air delivery pipe 201 is connected to the hydrogen source, and the exhaust end thereof is connected to the hydrogen-containing fuel inlet 104.

[0036] Preferably, the volume of the inner cavity of the expansion joint 202 increases successively along the direction of the airflow, and a gas component concentration detector 204 is independently provided in the inner cavity of each expansion joint 202 .

[0037] Preferably, at least one swirler 205 is independently provided in the gas delivery pipe 201 at the exhaust port of any expansion joint 202. Preferably, the swirler 205 is a swirling blade. Example 1

[0038] like Figure 4 As shown, a processing system for beryllium-containing materials includes a drying and roasting furnace 1 and a hydrogen-containing fuel premixing mechanism 2. The drying and roasting furnace 1 includes a furnace body 101 and a furnace 102. A material inlet 103, a hydrogen-containing fuel inlet 104 and an oxygen supplementation port 105 are independently opened at the front end of the furnace body 101, and a flue gas outlet 106 and a material outlet 107 are opened at the rear end of the furnace body 101. The furnace 102 is connected to the discharge end of the hydrogen-containing fuel premixing mechanism 2 through the hydrogen-containing fuel inlet 104. A hydrogen concentration detector 108 is also provided at the hydrogen-containing fuel inlet 104. An electric heating device 109 is also provided in the furnace 102. Three thermocouples 110 are also provided in the furnace 102. Example 2

[0039] Example 1 is repeated, except that the hydrogen-containing fuel premixing mechanism 2 includes a gas delivery pipe 201 and a plurality of expansion joints 202 arranged at intervals on the gas delivery pipe 201, and an air intake pipe 203 is independently arranged on each expansion joint 202. The intake end of the gas delivery pipe 201 is connected to the hydrogen source, and the exhaust end thereof is connected to the hydrogen-containing fuel inlet 104. The number of expansion joints 202 is 3. Example 3

[0040] Example 2 is repeated, except that the volume of the inner cavity of the expansion joint 202 is increased successively along the direction of the airflow, and a gas component concentration detector 204 is independently provided in the inner cavity of each expansion joint 202 . Example 4

[0041] Example 3 is repeated, except that a swirler 205 is independently provided in the gas delivery pipe 201 at the exhaust port of any expansion joint 202 . Example 5

[0042] Example 4 is repeated, except that the cyclone 205 is a swirl blade.

[0043] Application Example 1 The beryllium-containing material is treated using the treatment system described in Example 5: 100 kg of beryllium-containing material with a total moisture content of about 51.8 wt% and a beryllium hydroxide content of about 48.2 wt% is fed into the furnace 102 of the drying and roasting furnace 1, and hydrogen and air are premixed using the hydrogen-containing fuel premixing mechanism 2 to obtain a hydrogen-containing fuel with a hydrogen volume concentration of about 20%.

[0044] The hydrogen-containing fuel is transported to the furnace 102 and ignited by a graphite electrode electric heating device 109. The input amount of the hydrogen-containing fuel per unit time is controlled so that the temperature in the furnace 102 rises to 450°C and is kept warm for 3 hours (drying treatment). Then, the input amount of the hydrogen-containing fuel per unit time is increased so that the temperature in the furnace 102 rises to 950°C and is kept warm for 3 hours (roasting treatment). Finally, the input of the hydrogen-containing fuel is stopped and the material is cooled to obtain about 28.62 kg of beryllium oxide (the mass content of beryllium oxide is about 95.0wt%).

[0045] Application Example 2 The beryllium-containing material is treated using the treatment system described in Example 5: 100 kg of beryllium-containing material with a total moisture content of about 51.8 wt% and a beryllium hydroxide content of about 48.2 wt% is fed into the furnace 102 of the drying and roasting furnace 1, and hydrogen and air are premixed using the hydrogen-containing fuel premixing mechanism 2 to obtain a hydrogen-containing fuel with a hydrogen volume concentration of about 15%.

[0046] The hydrogen-containing fuel is transported to the furnace 102 and ignited by a graphite electrode electric heating device 109. The input amount of the hydrogen-containing fuel per unit time is controlled so that the temperature in the furnace 102 rises to 450°C and is kept warm for 3 hours. Then, the input amount of the hydrogen-containing fuel per unit time is increased so that the temperature in the furnace 102 rises to 950°C and is kept warm for 3 hours. Finally, the input of the hydrogen-containing fuel is stopped and the material is cooled to obtain about 28.73 kg of beryllium oxide (the mass content of beryllium oxide is about 94.1wt%).

[0047] Application Example 3 The beryllium-containing material is dried and calcined using the processing system described in Example 5: 100 kg of beryllium-containing material with a total moisture content of about 51.8 wt% and a beryllium hydroxide content of about 48.2 wt% is fed into the furnace 102 of the drying and roasting furnace 1, and hydrogen and air are premixed using the hydrogen-containing fuel premixing mechanism 2 to obtain a hydrogen-containing fuel with a hydrogen volume concentration of about 10%.

[0048] The hydrogen-containing fuel is transported into the furnace 102 and ignited by the graphite electrode electric heating device 109. During the drying and roasting process, the input amount of the hydrogen-containing fuel per unit time and the duration of each treatment are controlled in the same manner as in Application Example 1. After the roasting treatment is completed, the input of the hydrogen-containing fuel is stopped and the material is cooled to obtain about 28.87 kg of beryllium-containing oxide (the mass content of beryllium oxide is about 93.0 wt%).

[0049] Application Example 4 The beryllium-containing material is dried and calcined using the processing system described in Example 5: 100 kg of beryllium-containing material with a total moisture content of about 51.8 wt% and a beryllium hydroxide content of about 48.2 wt% is fed into the furnace 102 of the drying and roasting furnace 1, and hydrogen and air are premixed using the hydrogen-containing fuel premixing mechanism 2 to obtain a hydrogen-containing fuel with a hydrogen volume concentration of about 4.5%.

[0050] The hydrogen-containing fuel is transported to the furnace 102 and ignited by the graphite electrode electric heating device 109. During the drying and roasting process, the input amount of the hydrogen-containing fuel per unit time and the duration of each treatment are controlled in the same manner as in Application Example 1. After the roasting treatment is completed, the input of the hydrogen-containing fuel is stopped and the material is cooled to obtain about 29.03 kg of beryllium-containing oxide (the mass content of beryllium oxide is about 91.7 wt%).

[0051] Application Example 5 The beryllium-containing material is dried and calcined using the processing system described in Example 5: 100 kg of beryllium-containing material with a total moisture content of about 51.8 wt% and a beryllium hydroxide content of about 48.2 wt% is fed into the furnace 102 of the drying and roasting furnace 1, and hydrogen and air are premixed using the hydrogen-containing fuel premixing mechanism 2 to obtain a hydrogen-containing fuel with a hydrogen volume concentration of about 30%.

[0052] The above hydrogen-containing fuel is transported to the furnace 102 and ignited by the graphite electrode electric heating device 109. During the drying and roasting process, the input amount of the hydrogen-containing fuel per unit time and the duration of each treatment are controlled in the same manner as in Application Example 1. After the roasting process is completed, the input of the hydrogen-containing fuel is stopped and the material is cooled to obtain about 28.70 kg of beryllium-containing oxide (the mass content of beryllium oxide is about 94.4 wt%). In addition, since the volume concentration of hydrogen in the hydrogen-containing fuel is high, when air is used as the combustion-supporting gas, the oxygen content is insufficient, resulting in the inability to burn out the hydrogen, and thus the phenomenon of hydrogen energy waste.

[0053] Application Example 6 The beryllium-containing material is dried and calcined using the processing system described in Example 5: 100 kg of beryllium-containing material with a total moisture content of about 51.8 wt% and a beryllium hydroxide content of about 48.2 wt% is fed into the furnace 102 of the drying and roasting furnace 1, and hydrogen and air are premixed using the hydrogen-containing fuel premixing mechanism 2 to obtain a hydrogen-containing fuel with a hydrogen volume concentration of about 40%.

[0054] The above hydrogen-containing fuel is transported to the furnace 102 and ignited by the graphite electrode electric heating device 109. During the drying and roasting process, the input amount of the hydrogen-containing fuel per unit time and the duration of each treatment are controlled in the same manner as in Application Example 1. After the roasting treatment is completed, the input of the hydrogen-containing fuel is stopped and the material is cooled to obtain about 28.92 kg of beryllium-containing oxide (the mass content of beryllium oxide is about 92.6 wt%). In addition, since the volume concentration of hydrogen in the hydrogen-containing fuel is high, when air is used as the combustion-supporting gas, the oxygen content is insufficient, resulting in the inability to burn out the hydrogen, and thus there is also a phenomenon of waste of hydrogen energy.

[0055] Application Example 7 Example 1 was repeated, except that the input amount of hydrogen-containing fuel per unit time was controlled so that the temperature in the furnace during the drying process was 350° C. Finally, about 28.76 kg of beryllium-containing oxide material (beryllium oxide mass content was about 93.9 wt%) was obtained.

[0056] Application Example 8 Example 1 was repeated, except that the input amount of hydrogen-containing fuel per unit time was controlled so that the temperature in the furnace during the drying process was 200° C. Finally, about 28.99 kg of beryllium-containing oxide material (beryllium oxide mass content was about 92.0 wt%) was obtained.

[0057] Application Example 9 Example 1 was repeated except that the drying time was 2 hours. Finally, about 28.97 kg of beryllium oxide material (beryllium oxide mass content was about 92.2 wt%) was obtained.

[0058] Application Example 10 Example 1 was repeated except that the drying time was 1 hour. Finally, about 29.20 kg of beryllium oxide material (beryllium oxide mass content was about 90.4 wt%) was obtained.

[0059] Application Example 11 Example 1 was repeated, except that the input amount of hydrogen-containing fuel per unit time was controlled so that the temperature in the furnace during the roasting treatment was 800°C. Finally, about 28.78 kg of beryllium-containing oxide material (beryllium oxide mass content was about 93.7 wt%) was obtained. Application Example 12 Example 1 was repeated, except that the input amount of hydrogen-containing fuel per unit time was controlled so that the temperature in the furnace during the roasting treatment was 650° C. Finally, about 29.06 kg of beryllium-containing oxide material (beryllium oxide mass content was about 91.5 wt%) was obtained.

[0060] Application Example 13 Example 1 was repeated, except that the input amount of hydrogen-containing fuel per unit time was controlled so that the temperature in the furnace during the roasting treatment was 1000° C. Finally, about 28.60 kg of beryllium-containing oxide material (beryllium oxide mass content was about 95.2 wt%) was obtained.

[0061] Application Example 14 Example 1 was repeated except that the calcination time was 2 hours. Finally, about 28.71 kg of beryllium oxide material (beryllium oxide mass content was about 94.3%) was obtained.

[0062] Application Example 15 Example 1 was repeated except that the calcination time was 1 hour. Finally, about 28.87 kg of beryllium oxide material (beryllium oxide mass content was about 93.0 wt%) was obtained.

[0063] Comparative Example 1 100 kg of beryllium-containing material with a total moisture content of about 51.8 wt% and a beryllium hydroxide content of about 48.2 wt% is fed into the furnace 102 of the drying and roasting furnace 1, and hydrogen and air are premixed using the hydrogen-containing fuel premixing mechanism 2 to obtain a hydrogen-containing fuel with a hydrogen volume concentration of about 20%.

[0064] The above hydrogen-containing fuel is transported to the furnace 102, and ignited by the graphite electrode electric heating device 109, and the input amount of the hydrogen-containing fuel per unit time is controlled so that the temperature in the furnace 102 rises to 950°C, and is kept warm for 3 hours (roasting treatment); finally, the input of the hydrogen-containing fuel is stopped and the material is cooled to obtain about 29.56 kg of beryllium-containing oxide material (the mass content of beryllium oxide is about 87.6wt%). Compared with Application Example 1, Comparative Example 1 does not perform a separate drying treatment before roasting, so that the water vapor partial pressure in the atmosphere during the roasting process increases significantly, which is not conducive to the conversion of beryllium hydroxide into beryllium oxide.

[0065] Comparative Example 2 100 kg of beryllium-containing material with a total moisture content of about 51.8 wt% and a beryllium hydroxide content of about 48.2 wt% is fed into the furnace 102 of the drying and roasting furnace 1, and methane and air are premixed using the hydrogen-containing fuel premixing mechanism 2 to obtain a methane-containing fuel with a methane volume concentration of about 20%.

[0066] The methane-containing fuel is transported to the furnace 102 and ignited by the graphite electrode electric heating device 109. The input amount of the methane-containing fuel per unit time is controlled so that the temperature in the furnace 102 rises to 950°C and is kept warm for 3 hours (roasting treatment). Finally, the input of the methane-containing fuel is stopped and the material is cooled to obtain about 29.18 kg of beryllium-containing oxide material (the mass content of beryllium oxide is about 90.5wt%). Compared with Application Example 1, Comparative Example 2 does not perform a separate drying treatment before roasting, so that the water vapor partial pressure in the atmosphere during the roasting process increases significantly, which is not conducive to the conversion of beryllium hydroxide into beryllium oxide.

Claims

1. A method for treating beryllium-containing materials, characterized in that: The method comprises the following steps: S1: placing a beryllium-containing material in a calcining furnace, then premixing a hydrogen-containing gas and an oxygen-containing gas and then inputting the mixture into a drying calcining furnace for combustion and heat supply, and drying the beryllium-containing material to obtain a beryllium-containing dry material; S2: After the drying process is completed, the input amounts of hydrogen-containing gas and oxygen-containing gas are increased simultaneously to perform roasting process on the beryllium-containing dry material to obtain a beryllium-containing oxide material.

2. The method according to claim 1, characterized in that: In step S1, the hydrogen-containing gas is composed of hydrogen and one or more of carbon monoxide, natural gas, and nitrogen; the hydrogen concentration in the hydrogen-containing gas is not less than 50%, preferably the hydrogen concentration in the hydrogen-containing gas is 60-90%; and / or In step S1, the oxygen concentration in the oxygen-containing gas is not less than 20%, and preferably the oxygen-containing gas is air.

3. The method according to claim 1 or 2, characterized in that: In step S1, the drying temperature is not higher than 600°C, preferably 300-500°C; the drying time is 0.5-6h, preferably 1-5h; and / or In step S2, the temperature of the calcination treatment is not less than 700°C, preferably 800-1200°C; the duration of the calcination treatment is 1-5 hours, preferably 2-4 hours.

4. The method according to any one of claims 1 to 3, characterized in that: In step S1 and step S2, under the premise of meeting the current working condition requirements, the amount of hydrogen-containing gas and oxygen-containing gas introduced is controlled so that the volume of the introduced hydrogen gas accounts for less than 29.5% of the total volume of the mixed gas obtained by mixing the hydrogen-containing gas and the oxygen-containing gas, preferably 4-29%.

5. The method according to any one of claims 1 to 4, characterized in that: The beryllium-containing material is a solid material containing beryllium hydroxide, and its particle size is not greater than 1 mm, preferably 0.1-0.3 mm.

6. The method according to claim 5, characterized in that: The mass content of beryllium hydroxide in the beryllium-containing material is not less than 30%, preferably not less than 50%, more preferably not less than 80%; Preferably, the beryllium oxide-containing material is a solid material containing beryllium oxide.

7. A system for processing beryllium-containing materials or a system for processing a beryllium-containing material according to any one of claims 1 to 6, characterized in that: The processing system comprises a drying and roasting furnace (1) and a hydrogen-containing fuel premixing mechanism (2), wherein the drying and roasting furnace (1) comprises a furnace body (101) and a furnace (102), wherein a material inlet (103), a hydrogen-containing fuel inlet (104) and an oxygen supply port (105) are independently provided at the front end of the furnace body (101), and a flue gas outlet (106) and a material outlet (107) are provided at the rear end of the furnace body (101); the furnace (102) is connected to the discharge end of the hydrogen-containing fuel premixing mechanism (2) via the hydrogen-containing fuel inlet (104); a hydrogen concentration detector (108) is also provided at the hydrogen-containing fuel inlet (104); an electric heating device (109) is also provided in the furnace (102); and preferably, a plurality of thermocouples (110) are also provided in the furnace (102).

8. The processing system according to claim 7, characterized in that: The hydrogen-containing fuel premixing mechanism (2) comprises an air delivery pipe (201) and a plurality of expansion joints (202) arranged at intervals on the air delivery pipe (201), and an air intake pipe (203) is independently arranged on each expansion joint (202); the air intake end of the air delivery pipe (201) is connected to a hydrogen source, and the air exhaust end is connected to a hydrogen-containing fuel inlet (104).

9. The processing system according to claim 8, characterized in that: Along the direction of the airflow, the volume of the inner cavity of the expansion joint (202) increases successively, and a gas component concentration detector (204) is independently arranged in the inner cavity of each expansion joint (202).

10. The processing system according to claim 9, characterized in that: At least one swirler (205) is independently arranged in the gas delivery pipe (201) at the exhaust port of any expansion joint (202); preferably, the swirler (205) is a swirling blade.

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