Method for efficiently removing iron in melting transformation process of low-grade beryllium concentrate

Abstract

The invention relates to the field of beryllium smelting, in particular to a method for efficiently removing iron in the melting transformation process of low-grade beryllium concentrate, which comprises the following steps: S1, treating the low-grade beryllium concentrate, and uniformly mixing the low-grade beryllium concentrate with limestone and coke in proportion; s2, pressing and shaping the mixed substances into a mixed ball; s3, putting the mixed ball into a crucible, and smelting; s4, the smelted mixed cluster is a molten-state material, the molten-state material is poured into a mold to be cooled, and the high-activity beryllium-containing glass slag and the iron-based alloy are obtained; and S5, the beryllium-containing glass slag and the iron-based alloy are separated through mechanical crushing. The method has the effect of achieving efficient iron removal in the melting transformation process.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of beryllium smelting, in particular to a method for efficient iron removal in the smelting transformation process of low-grade beryllium concentrate. BACKGROUND

[0002] Beryllium concentrate is the core intermediate product of beryllium resource development and utilization, which is a high-grade beryllium mineral aggregate obtained by beneficiation process from beryllium ore, mainly used for subsequent smelting to extract metallic beryllium, beryllium oxide and other beryllium compounds. Beryllium is a light metal element, which has an irreplaceable role in high-end fields such as aerospace, nuclear industry and electronic information due to its unique physical and chemical properties, but at the same time, it has become a strategic resource of concern due to its toxicity and scarcity. Iron in low-grade beryllium concentrate mainly exists in the form of free mineral phases such as magnetite (Fe3O4), hematite (Fe2O3) and pyrite (FeS2), and part of it is embedded in beryl and other beryllium minerals in the form of structural iron.

[0003] At present, the industrial extraction of beryllium in China mainly uses beryl as raw material, which is obtained by high-temperature melting and then water quenching to obtain high-reactivity beryllium glass, followed by reaction with concentrated sulfuric acid to generate beryllium sulfate, which is then extracted by water immersion, and finally the impurities such as iron and aluminum are removed step by step by adjusting the pH value to obtain a pure beryllium-containing solution for subsequent preparation of beryllium oxide.

[0004] However, with the consumption of beryllium resources, the production raw materials of beryllium gradually shift to low-grade beryllium concentrate. The beryllium content in low-grade beryllium ore is not only low, but also the content of impurities such as iron is generally high, resulting in a large amount of iron in the glass slag after traditional smelting treatment. This problem significantly reduces the efficiency of subsequent acid leaching for iron removal, resulting in an increase in the use of ammonia and sulfuric acid, a complex process, and an increase in resource consumption and wastewater discharge, which is not conducive to the green development of the metallurgical process. The traditional process has not yet realized the in-situ removal of iron impurities at high temperature, and still relies on chemical precipitation separation in the wet process to complete the iron removal, resulting in high economic and environmental costs. SUMMARY

[0005] In order to achieve efficient iron removal in the smelting transformation process, the present application provides a method for efficient iron removal in the smelting transformation process of low-grade beryllium concentrate.

[0006] The method for efficient iron removal in the smelting transformation process of low-grade beryllium concentrate provided by the present application adopts the following technical scheme:

[0007] A method for efficient iron removal in the smelting transformation process of low-grade beryllium concentrate, comprising the steps of:

[0008] The low-grade beryllium concentrate is treated and mixed uniformly with limestone and coke in proportion;

[0009] The mixed material is pressed and shaped into a mixed group;

[0010] putting the mixed group into a crucible and smelting;

[0011] the smelted mixed group is molten material, pouring the molten material into a mold to cool, obtaining high-activity beryllium-containing glass slag and iron-based alloy;

[0012] separating the beryllium-containing glass slag and the iron-based alloy by mechanical crushing.

[0013] By adopting the above technical scheme, under high-temperature melting conditions, limestone reacts with SiO2 and Al2O3 in the beryllium concentrate as a flux, destroys the original silicon-aluminum skeleton structure, forms low-melting-point calcium silicate (such as CaSiO3) and calcium aluminate (such as CaAl2O4) and other liquid or molten products, promotes the transformation of beryl crystal structure to homogeneous molten phase; at the same time, a proper amount of carbon (such as coke powder) is introduced into the system as a reducing agent, which can effectively reduce the impurity iron component (such as Fe2O3, Fe3O4) in the melting stage to generate metallic iron; then, the molten material is naturally cooled through a specific cooling mold, and the slag and gold are separated by using the density difference: the metallic iron is enriched at the bottom and precipitated in a metallic state, while the upper layer forms a high-activity beryllium-containing slag with a glass structure after cooling.

[0014] Preferably, the processing of the low-grade beryllium concentrate includes the steps of:

[0015] grinding the beryllium concentrate;

[0016] screening the beryllium concentrate after grinding.

[0017] By adopting the above technical scheme, the contact area of beryllium minerals with limestone and coke can be increased by grinding and screening the low-grade beryllium concentrate, promoting the melting reaction of CaO and beryl during smelting; the reduction reaction of coke with Fe2O3 and Fe3O4 occurs rapidly at the particle interface, improving the reaction rate and increasing the removal rate of iron; after screening, the uneven heat / mass transfer during smelting caused by particle size differences can be avoided.

[0018] Preferably, the beryllium concentrate after grinding is screened through a 200-mesh sieve.

[0019] By adopting the above technical scheme, if the particle size is uneven, coarse particles cannot contact the auxiliary materials, resulting in reduced melting efficiency and iron reduction efficiency; too much or too little fine powder affects the strength of the mixed group, causing the mixed group to scatter during smelting; fine particles significantly increase the contact interface of beryllium minerals with limestone and coke, promoting the rapid progress of high-temperature melting and reduction reactions and improving the reaction rate.

[0020] Preferably, in the process of treating low-grade beryllium concentrate and mixing it evenly with limestone and coke in proportion, the amount of limestone added is 10% to 60% of the mass of the beryllium concentrate, and the amount of coke added is 1% to 10% of the mass of the beryllium concentrate. The beryllium concentrate, limestone and coke are mixed and stirred for 30 to 50 minutes.

[0021] By adopting the above technical solution, limestone acts as an alkaline flux to react with SiO2 and Al2O3 in beryllium concentrate to form products such as low-melting-point calcium silicate (such as CaSiO3) and calcium aluminate (such as CaAl2O4); when the addition amount is 10% to 60% of the mass of the beryllium concentrate: if it is 10%, it ensures that CaO reacts completely with beryl, avoiding incomplete decomposition of beryl due to insufficient CaO; if it is 60%, it prevents excessive CaO from causing a sudden increase in slag viscosity, affecting the slag-gold separation efficiency, and avoiding CaO in the subsequent leaching process. 2+ The concentration is too high. Excessive CaO (>60%) will increase the melt viscosity and make the glass phase structure too dense, which will reduce the activity and make subsequent beryllium extraction difficult. If the CaO content is less than 10%, the beryl structure is not fully destroyed and the beryllium glass conversion rate is lower than the target value.

[0022] When coke is used as a reducing agent and the addition amount is 1%, the system has basic reducing properties and can partially reduce iron oxides, initially realizing iron precipitation, but the reduction is incomplete and the iron removal efficiency is limited; when the addition amount is 10%, the reducing atmosphere of the system is significantly enhanced, the iron oxides can be fully reduced to a metallic state to prevent reoxidation, and at the same time it is beneficial to the separation of iron and slag, and the iron removal effect is optimal; if the coke amount is excessive (>10%), the reducing atmosphere in the system will be too strong, which may cause side reactions, such as the reduction of some non-target components such as aluminum and silicon, destroying the slag structure, affecting beryllium activation and subsequent leaching process; if the coke amount is less than 1%, the system's reducing properties are insufficient, making it difficult to completely reduce iron oxides, resulting in iron impurities remaining in the slag, reducing the iron removal effect.

[0023] Preferably, the mixed material is pressed and shaped into a mixed mass, and the diameter of the mixed mass is not greater than 15 mm.

[0024] By adopting the above technical solution, when the diameter of the mixed mass is ≤15mm, the heat conduction time from the crucible wall to the mass core during the smelting process can be shortened, so that the mixed mass is heated evenly and the reaction rate is improved; when the diameter of the mixed mass is greater than 15mm, the delayed heat transfer in the central area may lead to incomplete melting reaction; when the diameter of the mixed mass is less than 15mm, the mass strength is insufficient.

[0025] Preferably, the step of placing the mixed mass into a crucible and smelting the mixed mass specifically comprises the following steps:

[0026] Adjust the melting temperature to 1250-1650℃;

[0027] keeping the mixed group in a molten state for 10-90 min.

[0028] By adopting the technical scheme, iron removal rate of 80-99% is achieved in the parameter range of 1250-1650℃ and 10-90 min, which is improved compared with the traditional single temperature process.

[0029] Preferably, the smelting temperature is 1350-1550℃.

[0030] By adopting the technical scheme, the temperature interval accurately covers the melting reaction and reduction reaction in the iron removal process of low-grade beryllium concentrate smelting transformation. When the temperature is above 1350℃, limestone reacts with beryl to form a molten state. In this process, iron oxides are reduced to metallic iron, and are physically separated from the melt at high temperature. When the temperature is below 1550℃, excessive CaO increases the viscosity of the melt and makes the glass phase structure too dense, thereby reducing the activity of the glass phase and making it difficult to extract beryllium later. Coke provides a reducing atmosphere to reduce iron oxides to elemental iron at 1350-1550℃.

[0031] Preferably, the molten material is poured into a mold for cooling, and the mold is a high-temperature resistant graphite mold.

[0032] By adopting the technical scheme, the high-temperature resistant graphite mold has a fast cooling rate, which can ensure that the beryllium-containing glass slag maintains an intact amorphous structure, avoid crystallization reactions caused by slow cooling, and improve the separation efficiency during mechanical crushing. At a smelting temperature of 1350-1550℃, the thermal expansion coefficient of the graphite mold is less different from that of the molten material, the thermal stress between the mold and the material is reduced, the cracking or sticking caused by thermal expansion and cold shrinkage of traditional steel molds is avoided, the layered structure on the surface of the graphite mold provides natural lubricity, reduces the adhesion between the molten material and the mold after cooling, shortens the demolding time, reduces the waste of raw materials, and avoids the introduction of impurities caused by the demolding agent.

[0033] Preferably, the cooling is natural air cooling.

[0034] By adopting the technical scheme, the natural air cooling and the physical properties of the molten material form a dynamic balance, avoiding the occurrence of crystallization reactions and causing structural passivation.

[0035] Preferably, the high-activity beryllium-containing glass slag has a Fe content of <0.2%.

[0036] In summary, the present application includes at least one of the following beneficial technical effects:

[0037] 1. Limestone as alkaline flux reacts with beryl to destroy its original silicon-aluminum framework structure, promotes the transformation of beryl crystal structure to homogeneous melt phase, which can significantly reduce the melting point and viscosity of the mineral; coke can provide a reducing atmosphere, so that the iron oxide in the mineral is reduced to iron. Subsequently, the molten product is cooled by a specific cooling mold, and the iron-based alloy will settle at the bottom during the cooling process due to its high density, realizing physical slag-gold separation and thus improving the removal rate of iron in the glass slag.

[0038] 2. The graphite mold can improve the cooling rate of the molten material, ensure that the beryllium-containing glass slag maintains an intact amorphous structure, and avoid the occurrence of crystallization reaction caused by slow cooling; at a smelting temperature of 1350-1550℃, the thermal expansion coefficient of the graphite mold is relatively small compared to the molten material, the thermal stress between the mold and the material is reduced, the cracking or sticking caused by thermal expansion and cold shrinkage of the traditional steel mold is avoided, the layered structure on the surface of the graphite mold provides natural lubricity, reduces the adhesion between the molten material and the mold after cooling, shortens the demolding time, reduces the waste of raw materials, and avoids the introduction of impurities by the demolding agent. BRIEF DESCRIPTION OF DRAWINGS

[0039] Figure 1 is a flowchart illustrating the method. DETAILED DESCRIPTION

[0040] The following will be described in detail with reference to the accompanying drawings. Figure 1 The present application will be further described in detail.

[0041] The embodiment of the present application discloses a method for efficient iron removal in the smelting transformation process of low-grade beryllium concentrate.

[0042] Referring to Figure 1 , the method for efficient iron removal in the smelting transformation process of low-grade beryllium concentrate includes the following steps:

[0043] S1. Ball mill the low-grade beryllium concentrate to make its particle size reach 200 mesh or less, and screen it through a 200 mesh screen. Add limestone to 10% to 60% of the mass of the beryllium concentrate, add coke to 1% to 10% of the mass of the beryllium concentrate, and mix and stir in the mixer for 30 to 50 minutes to ensure uniform mixing of the materials.

[0044] Wherein, by grinding and sieving treatment of low-grade beryllium concentrate, the contact area of beryllium minerals with limestone and coke can be increased, and the melting reaction of CaO with beryl and the reduction reaction of coke with Fe2O3 and Fe3O4 can be promoted to proceed rapidly at the particle interface, so as to improve the reaction rate and the iron removal rate. After sieving, the uneven heat / mass transfer in the smelting process caused by the difference in particle size can be avoided. If the particle size is uneven, the coarse particles cannot contact the auxiliary materials, resulting in reduced melting efficiency and iron reduction efficiency. Too much or too little fine powder affects the strength of the mixed group, causing the group to scatter during smelting. The fine particles significantly increase the contact interface of beryllium minerals with limestone CaCO3 and coke C, promoting the rapid progress of the melting and reduction reactions at high temperature, and improving the reaction rate.

[0045] Limestone reacts with SiO2 and Al2O3 in beryl as an alkaline flux to form low-melting-point products such as calcium silicate (such as CaSiO3) and calcium aluminate (such as CaAl2O4). When the amount added is 10% to 60% of the mass of the beryllium concentrate: optionally, if it is 10% of the mass of the beryllium concentrate: ensures complete reaction of CaO with beryl, avoiding incomplete decomposition of beryl due to insufficient CaO; optionally, if it is 60% of the mass of the beryllium concentrate: prevents the sudden increase in slag viscosity caused by excessive CaO, affecting the efficiency of slag-gold separation, and avoids excessive CaO in the subsequent leaching process, which can cause the concentration of beryllium to be too high; wherein, excessive CaO (> 60%) will increase the viscosity of the melt and make the glass phase structure too dense, thereby reducing the activity and making it difficult to extract beryllium subsequently; optionally, if the amount of CaO is less than 10% of the mass of the beryllium concentrate, the structure of beryl is not fully destroyed, and the glass transition rate of beryllium is less than the target value. 2+

[0046] Coke as a reducing agent, optionally, when the amount of coke added is 1% of the mass of the beryllium concentrate: the system has basic reducing properties, and iron oxides can be partially reduced, preliminarily realizing the precipitation of iron, but the reduction is not complete, and the iron removal rate is limited; optionally, when the amount of coke added is 10% of the mass of the beryllium concentrate: the reducing atmosphere of the system is significantly enhanced, and iron oxides can be fully reduced to metallic state, preventing re-oxidation, and facilitating the separation of iron from the molten slag, with the best iron removal effect. Optionally, if the amount of coke is excessive (i.e. the amount of coke added is > 10% of the mass of the beryllium concentrate), the reducing atmosphere in the system is too strong, which can cause side reactions such as the reduction of part of the non-target components such as aluminum and silicon, destroying the structure of the molten slag and affecting the activation of beryllium and the subsequent leaching process; optionally, if the amount of coke is less than 1% of the mass of the beryllium concentrate, the reducing property of the system is insufficient, making it difficult to completely reduce iron oxides, resulting in the presence of iron impurities in the molten slag and reducing the iron removal effect.

[0047] S2. The uniformly mixed material is sent to a roller-type balling machine to be pressed into pellets, with the diameter of the pellets controlled within 15 mm to ensure that the strength and size of the pellets meet the requirements of smelting operation.

[0048] ​When the diameter of the mixed briquette is less than or equal to 15 mm, the conduction time of heat from the crucible wall to the briquette core during smelting can be shortened, the mixed briquette can be uniformly heated, and the reaction rate can be improved; when the diameter of the mixed briquette is greater than 15 mm, the heat transfer delay in the central region can cause incomplete formation of the molten phase; and when the diameter of the mixed briquette is less than 15 mm, the strength of the briquette is insufficient.

[0049] S3. The dried briquettes are placed in a graphite crucible and put into an electric arc furnace for high-temperature smelting treatment, the smelting temperature is set to 1250-1650°C, and the molten state is maintained for 10-90 min; during the melting process, the iron oxides in the beryllium ore are reduced to metallic iron by the coke.

[0050] In the temperature range, the melting reaction and the reduction reaction in the iron removal process of the low-grade beryllium concentrate are accurately covered; in an optional embodiment, when the smelting temperature is above 1350°C, the limestone reacts with the beryl to form a molten state, in this process, the iron oxides are reduced to metallic iron, and are physically separated from the molten material at high temperature; in an optional embodiment, when the temperature is below 1550°C, the excess CaO increases the viscosity of the melt and makes the glass phase structure too dense, thereby reducing the activity of the glass phase, and making it difficult to extract beryllium later; in a preferred embodiment, the coke (C) reduces the iron oxides to iron at 1350-1550°C by providing a reducing atmosphere.

[0051] S4. The molten material is quickly poured into a high-temperature resistant graphite mold and naturally air-cooled to room temperature. In this process, the iron-based alloy settles at the bottom of the mold; after cooling, a high-activity beryllium-containing glass slag and an iron-based alloy can be obtained, with a clear interface, and the slag and gold are separated by mechanical crushing.

[0052] The graphite mold can increase the cooling rate of the molten material, ensure that the beryllium-containing glass slag maintains an intact amorphous structure, and avoid the occurrence of crystallization reaction caused by slow cooling; optionally, at a smelting temperature of 1350-1550°C, the thermal expansion coefficient of the graphite mold is less different from that of the molten material, the thermal stress between the mold and the material is reduced, the cracking or sticking caused by thermal expansion and cold shrinkage of the traditional steel mold is avoided, the layered structure on the surface of the graphite mold provides natural lubricity, reduces the adhesion between the molten material and the mold after cooling, shortens the demolding time, reduces the waste of raw materials, and avoids the pollution of impurities introduced by the demolding agent.

[0053] Iron can be physically separated in the melting stage, significantly reducing the concentration of iron impurities in the glass slag, avoiding the problem of increased ammonia water consumption caused by relying on pH adjustment method to remove iron in the subsequent leaching process, realizing the integration of in-situ iron removal and process greenization in the melting process, significantly improving the production efficiency, realizing the effective removal of iron impurities in the high-temperature melting stage, simplifying the subsequent leaching and impurity removal process; effectively reducing acid consumption, alkali consumption and wastewater discharge, improving resource utilization rate; The process is short and efficient; and it is conducive to adapting to the complex low-grade beryllium ore resource utilization demand.

[0054] Specifically, the application of the above method can include the following embodiments:

[0055] Embodiment 1:

[0056] As shown in Figure 1 , a method for efficiently removing iron in a low-grade beryllium concentrate melting transformation process, the specific steps are as follows:

[0057] S1. Grind the low-grade beryllium concentrate to a 200 mesh sieve undersize mass percentage of more than 90%, add 10% of limestone and 1% of coke, and put into a mixer for mixing for 40 min;

[0058] S2. Put the mixed raw materials into a roller-type balling machine to ball, control the pellet diameter to be 15 mm;

[0059] S3. Put the pellets into a graphite crucible and place it in an electric arc furnace, heat and smelt at 1300℃ for 30 min;

[0060] S4. Pour the molten sample into a pre-installed graphite mold, and the cooling method is air cooling;

[0061] S5. After cooling, separate to obtain high-activity beryllium-containing glass slag and iron-based alloy.

[0062] S6. Record the experimental data, detect the Fe content in the glass slag, and calculate the removal rate.

[0063] After the above process, the Fe content in the glass slag is 1.36; the removal rate of Fe is 84.82%.

[0064] Embodiment 2:

[0065] As shown in Figure 1 , a method for efficiently removing iron in a low-grade beryllium concentrate melting transformation process, the specific steps are as follows:

[0066] S1. Grind the low-grade beryllium concentrate to a 200 mesh sieve undersize mass percentage of more than 90%, add 10% of limestone and 1% of coke, and put into a mixer for mixing for 40 min;

[0067] S2. The mixed raw materials are fed into a roller-type pelletizing machine to control the pellet diameter to 15mm;

[0068] S3. The pellets are loaded into a graphite crucible, placed in an electric arc furnace, and heated and smelted at 1400°C for 40min;

[0069] S4. Pour the molten sample into a pre-set graphite mold and cool it with air;

[0070] S5. After cooling, high-activity beryllium-containing glass slag and iron-based alloy are separated.

[0071] S6. Record the experimental data, detect the Fe content in the glass slag, and calculate the removal rate.

[0072] After the above process, the Fe content in the glass slag is 0.92; the Fe removal rate is 87.82%.

[0073] Example 3:

[0074] like Figure 1 As shown, a method for efficiently removing iron during the melting transformation of low-grade beryllium concentrate is provided, and the specific steps are as follows:

[0075] S1. Grind the low-grade beryllium concentrate to a mass percentage of greater than 95% on a 200-mesh sieve, add 50% limestone and 8% coke, and mix in a blender for 45 minutes;

[0076] S2. The mixed raw materials are fed into a roller-type pelletizing machine to control the pellet diameter to 15mm;

[0077] S3. The pellets were loaded into a graphite crucible, placed in an electric arc furnace, and heated and smelted at 1450°C for 60 min;

[0078] S4. Pour the molten sample into a pre-set graphite mold and cool it with air;

[0079] S5. After cooling, high-activity beryllium-containing glass slag and iron-based alloy are separated.

[0080] S6. Record the experimental data, detect the Fe content in the glass slag, and calculate the removal rate.

[0081] After the above process, the Fe content in the glass slag is 0.81; the Fe removal rate is 90.82%.

[0082] Example 4:

[0083] like Figure 1 As shown, a method for efficiently removing iron during the melting transformation of low-grade beryllium concentrate is provided, and the specific steps are as follows:

[0084] S1. The low-grade beryllium concentrate was ground to a 200-mesh sieve undersize mass percentage of more than 95%, 20% of limestone and 4% of coke were added, and mixed in a mixer for 35 min, and mixed in a mixer for 50 min;

[0085] S2. The mixed raw materials were sent to a roller-type balling machine for balling, and the ball diameter was controlled to be 15 mm;

[0086] S3. The pellets were loaded into a graphite crucible and placed into an electric arc furnace, heated and smelted at 1500°C for 50 min;

[0087] S4. The molten sample was poured into a pre-installed graphite mold, and the cooling method was air cooling;

[0088] S5. After cooling, high-activity beryllium-containing glass slag and iron-based alloy were separated.

[0089] S6. Record the experimental data, detect the Fe content in the glass slag, and calculate the removal rate.

[0090] After the above process, the Fe content in the glass slag is 0.52; the removal rate of Fe is 91.23%.

[0091] Example 5:

[0092] As Figure 1 shown, a method for efficient iron removal in the smelting transformation process of low-grade beryllium concentrate, the specific steps are as follows:

[0093] S1. The low-grade beryllium concentrate was ground to a 200-mesh sieve undersize mass percentage of more than 95%, 20% of limestone and 4% of coke were added, and mixed in a mixer for 35 min, and mixed in a mixer for 50 min;

[0094] S2. The mixed raw materials were sent to a roller-type balling machine for balling, and the ball diameter was controlled to be 15 mm;

[0095] S3. The pellets were loaded into a graphite crucible and placed into an electric arc furnace, heated and smelted at 1500°C for 50 min;

[0096] S4. The molten sample was poured into a pre-installed graphite mold, and the cooling method was air cooling;

[0097] S5. After cooling, high-activity beryllium-containing glass slag and iron-based alloy were separated.

[0098] S6. Record the experimental data, detect the Fe content in the glass slag, and calculate the removal rate.

[0099] After the above process, the Fe content in the glass slag is 0.52; the removal rate of Fe is 91.23%.

[0100] Example 6:

[0101] As Figure 1 shown, a method for efficient iron removal in the smelting transformation process of low-grade beryllium concentrate, the specific steps are as follows:

[0102] S1. Grind the low-grade beryllium concentrate to a 200 mesh sieve undersize mass percentage of more than 95%, add 60% of limestone and 10% of coke, put into the mixer and mix for 50 min;

[0103] S2. Put the mixed raw materials into the roller type balling machine to ball, control the pellet diameter to be 15 mm;

[0104] S3. Put the pellets into graphite crucible, put into electric arc furnace, heat and smelt at 1600℃ for 60 min;

[0105] S4. Pour the molten sample into the pre-set graphite mold, and the cooling method is air cooling;

[0106] S5. After cooling, separate to obtain high-activity beryllium-containing glass slag and iron-based alloy.

[0107] S6. Record the experimental data, detect the Fe content in the glass slag, and calculate the removal rate.

[0108] After the above process, the Fe content in the glass slag is 0.16%; the removal rate of Fe is 96.56%.

[0109] Example 7:

[0110] As Figure 1 shown, a method for efficient iron removal in the smelting transformation process of low-grade beryllium concentrate, the specific steps are as follows:

[0111] S1. Grind the low-grade beryllium concentrate to a 200 mesh sieve undersize mass percentage of more than 95%, add 60% of limestone and 10% of coke, put into the mixer and mix for 50 min;

[0112] S2. Put the mixed raw materials into the roller type balling machine to ball, control the pellet diameter to be 15 mm;

[0113] S3. Put the pellets into graphite crucible, put into electric arc furnace, heat and smelt at 1600℃ for 60 min;

[0114] S4. Pour the molten sample into the pre-set graphite mold, and the cooling method is air cooling;

[0115] S5. After cooling, separate to obtain high-activity beryllium-containing glass slag and iron-based alloy.

[0116] S6. Record the experimental data, detect the Fe content in the glass slag, and calculate the removal rate.

[0117] After the above process, the Fe content in the glass slag is 0.18%; the removal rate of Fe is 96.26%.

[0118] Example 8:

[0119] As Figure 1 shown in the figure, a method for efficiently removing iron in a low-grade beryllium concentrate melting transformation process, the specific steps are as follows:

[0120] S1. Grind the low-grade beryllium concentrate to a 200-mesh sieve undersize mass percentage of more than 95%, add 35% of limestone and 3% of coke, and put it into a mixer for mixing for 50 min;

[0121] S2. Put the mixed raw materials into a roller-type balling machine for balling, and control the pellet diameter to be 15 mm;

[0122] S3. Put the pellets into a graphite crucible and place it into an electric arc furnace for heating and smelting at 1450℃ for 45 min;

[0123] S4. Pour the molten sample into a pre-installed graphite mold, and the cooling method is air cooling;

[0124] S5. After cooling, separate to obtain high-activity beryllium-containing glass slag and iron-based alloy.

[0125] S6. Record the experimental data, detect the Fe content in the glass slag, and calculate the removal rate.

[0126] After the above process, the Fe content in the glass slag is 0.12%; the removal rate of Fe is 98.56%.

[0127] The implementation principle of the embodiments of the present application is: under high-temperature melting conditions, limestone is thermally decomposed to generate CaO, which reacts with SiO2 and Al2O3 in the beryllium concentrate as a flux, destroys the original silicon-aluminum skeleton structure, and forms low-melting-point calcium silicate (such as CaSiO3) and calcium aluminate (such as CaAl2O4) and other liquid or molten products, promoting the conversion of beryl crystal structure to a homogeneous molten phase; at the same time, a proper amount of carbon (such as coke powder) is introduced as a reducing agent, which can effectively reduce the impurity iron components (such as Fe2O3, Fe3O4) in the melting stage to generate metallic iron; then, the molten material is naturally cooled through a specific cooling mold, and the slag and gold are separated by using the density difference: the metallic iron is enriched at the bottom and precipitated in a metallic state, while the upper layer forms a high-activity beryllium-containing slag with a glass structure after cooling.

[0128] The above are preferred embodiments of the present application, which do not limit the protection scope of the present application, therefore: any equivalent changes made on the structure, shape, principle of the present application should be covered within the protection scope of the present application.

Claims

1. A method for efficient iron removal during the melting transformation of low-grade beryllium concentrate, characterized in that: Including steps: Process low-grade beryllium concentrate and mix it with limestone and coke in a uniform proportion; The mixed material is pressed and shaped into a mixed mass; Put the mixed mass into a crucible and smelt it; The mixed mass after smelting is a molten material, which is poured into a mold and cooled to obtain highly active beryllium-containing glass slag and iron-based alloy; Beryllium-containing glassy slag and iron-based alloy are separated by mechanical crushing.

2. The method for efficient iron removal during the melting transformation of low-grade beryllium concentrate according to claim 1, characterized in that: The processing of low-grade beryllium concentrate comprises the steps of: Grinding beryllium concentrate; The beryllium concentrate is screened after grinding.

3. The method for efficient iron removal during the melting transformation of low-grade beryllium concentrate according to claim 2, characterized in that: The ground beryllium concentrate passes through a 200-mesh sieve.

4. The method for efficient iron removal during the melting transformation of low-grade beryllium concentrate according to claim 3, characterized in that: The low-grade beryllium concentrate is processed and mixed evenly with limestone and coke in proportion, wherein the amount of limestone added is 10% to 60% of the mass of the beryllium concentrate, and the amount of coke added is 1% to 10% of the mass of the beryllium concentrate. The beryllium concentrate, limestone and coke are mixed and stirred for 30 to 50 minutes.

5. The method for efficient iron removal during the melting transformation of low-grade beryllium concentrate according to claim 1, characterized in that: The mixed material is pressed and shaped into a mixed mass, and the diameter of the mixed mass is no greater than 15 mm.

6. The method for efficient iron removal during the melting transformation of low-grade beryllium concentrate according to claim 1, characterized in that: The process of placing the mixed mass into a crucible and smelting the mixture specifically comprises the following steps: Adjust the melting temperature to 1250-1650℃; Keep the mixture in a molten state for 10 to 90 minutes.

7. The method for efficient iron removal during the melting transformation of low-grade beryllium concentrate according to claim 6, characterized in that: The smelting temperature is 1350-1550°C.

8. The method for efficient iron removal during the melting transformation of low-grade beryllium concentrate according to claim 1, characterized in that: The molten material is poured into a mold and cooled, and the mold is a high-temperature resistant graphite mold.

9. The method for efficient iron removal during the melting transformation of low-grade beryllium concentrate according to claim 8, characterized in that: The cooling is natural air cooling.

10. The method for efficient iron removal during the melting transformation of low-grade beryllium concentrate according to claim 9, characterized in that: The Fe content in the high-activity beryllium-containing glassy slag is less than 0.2%.

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