CN104726694A - Sintering prevention vanadium-containing stone coal microwave roasting method - Google Patents
Sintering prevention vanadium-containing stone coal microwave roasting method Download PDFInfo
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- 239000003245 coal Substances 0.000 title claims abstract description 99
- 238000000034 method Methods 0.000 title claims abstract description 37
- 229910052720 vanadium Inorganic materials 0.000 title abstract description 101
- LEONUFNNVUYDNQ-UHFFFAOYSA-N vanadium atom Chemical compound [V] LEONUFNNVUYDNQ-UHFFFAOYSA-N 0.000 title abstract description 101
- 239000004575 stone Substances 0.000 title abstract description 88
- 238000005245 sintering Methods 0.000 title abstract description 16
- 230000002265 prevention Effects 0.000 title 1
- 239000000463 material Substances 0.000 claims abstract description 42
- 239000002245 particle Substances 0.000 claims abstract description 33
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 13
- 239000008187 granular material Substances 0.000 claims description 5
- 229940037003 alum Drugs 0.000 claims 11
- 239000011435 rock Substances 0.000 claims 11
- 238000001354 calcination Methods 0.000 claims 4
- 239000011324 bead Substances 0.000 claims 3
- 238000001035 drying Methods 0.000 claims 1
- 238000010438 heat treatment Methods 0.000 abstract description 17
- 239000008188 pellet Substances 0.000 abstract description 14
- 230000000694 effects Effects 0.000 abstract description 10
- 238000002386 leaching Methods 0.000 description 18
- 238000000605 extraction Methods 0.000 description 9
- 239000002253 acid Substances 0.000 description 7
- 230000009286 beneficial effect Effects 0.000 description 3
- 238000003756 stirring Methods 0.000 description 3
- 229910001579 aluminosilicate mineral Inorganic materials 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 229910052500 inorganic mineral Inorganic materials 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 150000002739 metals Chemical class 0.000 description 2
- 239000011707 mineral Substances 0.000 description 2
- 230000035699 permeability Effects 0.000 description 2
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
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- 230000007547 defect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 229910052900 illite Inorganic materials 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 239000010445 mica Substances 0.000 description 1
- 229910052618 mica group Inorganic materials 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- VGIBGUSAECPPNB-UHFFFAOYSA-L nonaaluminum;magnesium;tripotassium;1,3-dioxido-2,4,5-trioxa-1,3-disilabicyclo[1.1.1]pentane;iron(2+);oxygen(2-);fluoride;hydroxide Chemical compound [OH-].[O-2].[O-2].[O-2].[O-2].[O-2].[F-].[Mg+2].[Al+3].[Al+3].[Al+3].[Al+3].[Al+3].[Al+3].[Al+3].[Al+3].[Al+3].[K+].[K+].[K+].[Fe+2].O1[Si]2([O-])O[Si]1([O-])O2.O1[Si]2([O-])O[Si]1([O-])O2.O1[Si]2([O-])O[Si]1([O-])O2.O1[Si]2([O-])O[Si]1([O-])O2.O1[Si]2([O-])O[Si]1([O-])O2.O1[Si]2([O-])O[Si]1([O-])O2.O1[Si]2([O-])O[Si]1([O-])O2 VGIBGUSAECPPNB-UHFFFAOYSA-L 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
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Abstract
本发明涉及一种防烧结的含钒石煤微波焙烧方法。其技术方案是：将含钒石煤破碎至粒径小于6mm，分为粒径小于6mm且大于等于1mm的粗粒级含钒石煤和粒径小于1mm的细粒级含钒石煤；再按细粒级含钒石煤︰水的质量比为1︰0.06~0.09，向细粒级含钒石煤中加水混合，制得粒径为3~8mm的小球，干燥；然后将干燥后的小球置于工业微波焙烧设备中作为铺底料，再将粗粒级含钒石煤置于铺底料之上，微波焙烧，冷却至室温，得到含钒石煤焙烧料。所述微波焙烧是以25~55℃/min的升温速率升温至750~850℃，恒温微波焙烧25~40min，所述工业微波焙烧设备的频率为2400~2500MHz。本发明能显著减少含钒石煤微波焙烧过程中的烧结现象，微波焙烧效果好。The invention relates to an anti-sintering microwave roasting method for vanadium-containing stone coal. The technical solution is: crush the vanadium-containing stone coal until the particle size is less than 6mm, and divide it into coarse-grained vanadium-containing stone coal with a particle size of less than 6mm and greater than or equal to 1mm and fine-grained vanadium-containing stone coal with a particle size less than 1mm; According to the mass ratio of fine-grained vanadium-containing stone coal to water: 1:0.06~0.09, add water to the fine-grained vanadium-containing stone coal and mix to obtain pellets with a particle size of 3-8 mm, and dry them; then dry them The pellets are placed in industrial microwave roasting equipment as the base material, and then the coarse-grained vanadium-containing stone coal is placed on the base material, microwave roasted, cooled to room temperature, and the vanadium-containing stone coal roasted material is obtained. The microwave roasting is to raise the temperature to 750-850°C at a heating rate of 25-55°C/min, and microwave roasting at a constant temperature for 25-40min, and the frequency of the industrial microwave roasting equipment is 2400-2500MHz. The invention can significantly reduce the sintering phenomenon in the microwave roasting process of the vanadium-containing stone coal, and the microwave roasting effect is good.
Description
技术领域 technical field
本发明属于石煤提钒技术领域。具体涉及一种防烧结的含钒石煤微波焙烧方法。 The invention belongs to the technical field of vanadium extraction from stone coal. In particular, it relates to a sintering-proof microwave roasting method for vanadium-containing stone coal.
背景技术 Background technique
含钒石煤是我国特有的一种重要含钒资源，经过科技工作者的不断努力以及石煤提钒产业规模的日趋壮大，石煤提钒已成为提钒领域极为重要的组成部分。石煤中的钒大部分为三价钒，并常以类质同象的形式赋存于云母、伊利石等铝硅酸盐类矿物中，较为稳定。传统的钠化焙烧-水浸提钒工艺由于其严重的环境污染已逐渐被目前趋于成熟的空白焙烧-酸浸和直接酸浸等工艺所取代。对于钒在铝硅酸盐矿物晶格中赋存率高，低价态钒含量高的一类含钒石煤，酸浸前往往需要进行焙烧作业，以尽可能地对含钒矿物的晶格进行预破坏，减轻后续酸浸作业的压力。 Vanadium-containing stone coal is an important vanadium-containing resource unique to my country. Through the continuous efforts of scientific and technological workers and the growing scale of the vanadium extraction industry from stone coal, vanadium extraction from stone coal has become an extremely important part of the field of vanadium extraction. Most of the vanadium in stone coal is trivalent vanadium, and it often occurs in aluminosilicate minerals such as mica and illite in the form of isomorphism, which is relatively stable. The traditional sodium roasting-water leaching vanadium extraction process has been gradually replaced by the blank roasting-acid leaching and direct acid leaching processes that are currently becoming more mature due to its serious environmental pollution. For a type of vanadium-containing stone coal with a high occurrence rate of vanadium in the crystal lattice of aluminosilicate minerals and a high content of low-valence vanadium, roasting operations are often required before acid leaching in order to minimize the crystal lattice of vanadium-containing minerals. Perform pre-destruction to reduce the pressure of subsequent acid leaching operations.
微波作为一种高效清洁的能源，在矿冶领域的研究及应用已越来越深入。部分研究工作者就将微波加热技术应用到石煤提钒焙烧作业中做了初步研究。由于微波加热选择性加热、整体性加热及高效加热等特点，微波加热能够更充分地破坏石煤中含钒矿物的结构，致使焙烧样获得更高的钒浸出率。然而，也正是因为微波焙烧的这些特点，在实际含钒石煤的微波焙烧过程中，常会出现物料发生烧结的情况，这对含钒石煤微波焙烧过程的顺行以及焙烧样的钒浸出率都存在严重的影响。 Microwave, as an efficient and clean energy source, has been more and more deeply researched and applied in the field of mining and metallurgy. Some researchers have done preliminary research on the application of microwave heating technology to the roasting operation of vanadium extraction from stone coal. Due to the characteristics of selective heating, integral heating and high-efficiency heating of microwave heating, microwave heating can more fully destroy the structure of vanadium-containing minerals in stone coal, resulting in a higher vanadium leaching rate for roasted samples. However, it is precisely because of these characteristics of microwave roasting that in the actual microwave roasting process of vanadium-containing stone coal, the material often sinters, which has great influence on the smooth progress of the microwave roasting process of vanadium-containing stone coal and the vanadium leaching of roasted samples. rates are seriously affected.
欧阳国强等（欧阳国强，张小云，田学达，李熠，谢森．微波焙烧对石煤提钒的影响[J]．中国有色金属学报，2008，18(4)：750-754．）研究了微波焙烧对石煤提钒的影响，焙烧后的石煤能够得到较高的钒浸出率，认为是由于微波焙烧选择性加热的特性，诱发物料颗粒产生的“裂解”作用促进了钒浸出率的提升。但并未对焙烧过程中物料的烧结问题及处理方式进行叙述。 Ouyang Guoqiang et al. (Ouyang Guoqiang, Zhang Xiaoyun, Tian Xueda, Li Yi, Xie Sen. Effect of Microwave Roasting on Vanadium Extraction from Stone Coal [J]. Chinese Journal of Nonferrous Metals, 2008, 18(4): 750-754.) The impact of microwave roasting on the extraction of vanadium from stone coal was studied. The roasted stone coal can obtain a higher vanadium leaching rate. It is believed that due to the selective heating characteristics of microwave roasting, the "cracking" effect induced by material particles promotes the vanadium leaching rate. improvement. However, the sintering problem and treatment methods of the materials in the roasting process are not described.
袁益忠等（袁益忠，张一敏，陈铁军，刘涛，王非，刘娟.石煤分级微波焙烧对提钒过程的影响研究[J].稀有金属，2014，38(3)：534-540）对不同粒级的含钒石煤分别进行了焙烧研究，发现由于微波加热选择性加热、整体加热等特性，细粒级石煤的存在会使物料在微波焙烧过程发生严重的烧结现象。按照该文中全粒级石煤的微波焙烧方式进行含钒石煤的焙烧，发生烧结的物料量会占到总物料的30%以上，且焙烧料中的钒浸出率不到60%，但文中并未提出具体的解决方式。 Yuan Yizhong et al. (Yuan Yizhong, Zhang Yimin, Chen Tiejun, Liu Tao, Wang Fei, Liu Juan. Study on the Effect of Stone Coal Graded Microwave Roasting on Vanadium Extraction Process [J]. Rare Metals, 2014, 38(3): 534-540) on different The vanadium-containing stone coal of particle size was roasted separately, and it was found that due to the characteristics of selective heating and overall heating of microwave heating, the existence of fine particle size stone coal would cause serious sintering of materials during microwave roasting. Roasting vanadium-containing stone coal according to the microwave roasting method of full-size stone coal in this article, the amount of sintered material will account for more than 30% of the total material, and the vanadium leaching rate in the roasted material is less than 60%. No specific solution was proposed.
综上所述，含钒石煤微波焙烧可以使含钒石煤在浸出作业中得到较高的钒浸出率，但物料的烧结会严重影响含钒石煤微波焙烧过程的顺行进行及其焙烧效果。而目前并没有一种既能有效减少物料烧结，又能充分发挥微波焙烧有利效果的处理方法。 To sum up, microwave roasting of vanadium-containing stone coal can obtain a higher vanadium leaching rate in the leaching operation of vanadium-containing stone coal, but the sintering of materials will seriously affect the forward progress of the vanadium-containing stone coal microwave roasting process and its roasting. Effect. At present, there is no treatment method that can effectively reduce material sintering and give full play to the beneficial effect of microwave roasting.
发明内容 Contents of the invention
本发明旨在克服现有技术缺陷，目的是提供一种防烧结的含钒石煤微波焙烧方法，该方法能显著减少含钒石煤微波焙烧过程中的烧结现象，微波焙烧效果好。 The invention aims to overcome the defects of the prior art, and aims to provide an anti-sintering microwave roasting method for vanadium-containing stone coal, which can significantly reduce the sintering phenomenon in the microwave roasting process of vanadium-containing stone coal, and has good microwave roasting effect.
为实现上述目的，本发明采用的技术方案的具体步骤是： In order to achieve the above object, the concrete steps of the technical solution adopted in the present invention are:
步骤一、先将含钒石煤破碎至粒径小于6mm，再分为粗粒级含钒石煤和细粒级含钒石煤，粗粒级含钒石煤的粒径小于6mm且大于等于1mm，细粒级含钒石煤粒径小于1mm。 Step 1. First crush the vanadium-containing stone coal until the particle size is less than 6mm, and then divide it into coarse-grained vanadium-containing stone coal and fine-grained vanadium-containing stone coal. The particle size of the coarse-grained vanadium-containing stone coal is less than 6mm and greater than or equal to 1mm, the particle size of fine-grained vanadium-containing stone coal is less than 1mm.
步骤二、按细粒级含钒石煤︰水的质量比为1︰0.06~0.09，向细粒级含钒石煤中加水混合，制粒，得到粒径为3~8mm的小球，干燥，得到干燥后的小球。 Step 2. According to the mass ratio of fine-grained vanadium-containing stone coal to water: 1:0.06~0.09, add water to the fine-grained vanadium-containing stone coal, granulate, and obtain pellets with a particle size of 3-8mm, and dry , to obtain dried pellets.
步骤三、将干燥后的小球置于工业微波焙烧设备中作为铺底料，再将粗粒级含钒石煤置于铺底料之上，微波焙烧，冷却至室温，得到含钒石煤焙烧料。 Step 3: Put the dried pellets in industrial microwave roasting equipment as the base material, then place the coarse-grained vanadium-containing stone coal on the base material, microwave roasting, and cool to room temperature to obtain the vanadium-containing stone coal roasting material .
所述微波焙烧的升温速率为25~55℃/min，微波焙烧的温度为750~850℃，恒温焙烧的时间为25~40min。 The heating rate of the microwave roasting is 25-55° C./min, the temperature of the microwave roasting is 750-850° C., and the constant-temperature roasting time is 25-40 minutes.
所述工业微波焙烧设备的频率为2400~2500MHz。 The frequency of the industrial microwave roasting equipment is 2400~2500MHz.
由于采用上述技术方案，本发明与现有技术相比具有如下的有益效果： Owing to adopting above-mentioned technical scheme, the present invention has following beneficial effect compared with prior art:
1、本发明将细粒级含钒石煤制粒成粒径为3~8mm的小球作为铺底料，与1~6mm粒径的含钒石煤一起焙烧，提高了含钒石煤微波焙烧的入炉粒径，改善了料堆的透气性，显著地减少了微波焙烧过程中含钒石煤的烧结现象，使得焙烧作业能够顺利进行，提高了焙烧效率。 1. In the present invention, fine-grained vanadium-containing stone coal is granulated into small balls with a particle size of 3-8mm as the bottom material, and roasted together with vanadium-containing stone coal with a particle size of 1-6mm, which improves the microwave roasting of vanadium-containing stone coal. The particle size into the furnace improves the air permeability of the stockpile, significantly reduces the sintering phenomenon of vanadium-containing stone coal during the microwave roasting process, makes the roasting operation go smoothly, and improves the roasting efficiency.
2、本发明在控制含钒石煤微波焙烧入炉粒级的同时，控制微波焙烧过程的升温速率为25~55℃/min，焙烧温度为750~850℃，恒温焙烧时间为25~40min，能够充分发挥微波焙烧的优势，焙烧效果好。 2. In the present invention, while controlling the microwave roasting of vanadium-containing stone coal into the furnace, the heating rate of the microwave roasting process is controlled to be 25-55°C/min, the roasting temperature is 750-850°C, and the constant-temperature roasting time is 25-40min. It can give full play to the advantages of microwave roasting, and the roasting effect is good.
3、本发明在微波焙烧过程中，烧结部分的物料量占总物料量的比小于3%；本发明制得的含钒石煤焙烧料经恒温搅拌酸浸，钒浸出率大于80%。 3. In the microwave roasting process of the present invention, the ratio of the material volume of the sintered part to the total material volume is less than 3%; the vanadium-containing stone coal roasted material prepared by the present invention is subjected to constant temperature stirring and acid leaching, and the vanadium leaching rate is greater than 80%.
因此，本发明能显著减少含钒石煤微波焙烧过程中的烧结现象，微波焙烧效果好。 Therefore, the invention can significantly reduce the sintering phenomenon in the microwave roasting process of the vanadium-containing stone coal, and the microwave roasting effect is good.
具体实施方法Specific implementation method
下面结合具体实施方式对本发明作进一步的描述，并非对其保护范围的限制。 The present invention will be further described below in combination with specific embodiments, which are not intended to limit the scope of protection thereof.
本具体实施方式中，所述工业微波焙烧设备的频率为2400~2500MHz，实施例中不再赘述。 In this specific implementation manner, the frequency of the industrial microwave roasting equipment is 2400-2500 MHz, which will not be repeated in the embodiments.
实施例1Example 1
一种防烧结的含钒石煤微波焙烧方法。所述方法的具体步骤是： An anti-sintering microwave roasting method for vanadium-containing stone coal. The concrete steps of described method are:
步骤一、先将含钒石煤破碎至粒径小于6mm，再分为粗粒级含钒石煤和细粒级含钒石煤，粗粒级含钒石煤的粒径小于6mm且大于等于1mm，细粒级含钒石煤粒径小于1mm。 Step 1. First crush the vanadium-containing stone coal until the particle size is less than 6mm, and then divide it into coarse-grained vanadium-containing stone coal and fine-grained vanadium-containing stone coal. The particle size of the coarse-grained vanadium-containing stone coal is less than 6mm and greater than or equal to 1mm, the particle size of fine-grained vanadium-containing stone coal is less than 1mm.
步骤二、按细粒级含钒石煤︰水的质量比为1︰0.06~0.07，向细粒级含钒石煤中加水混合，制粒，得到粒径为3~8mm的小球，干燥，得到干燥后的小球。 Step 2. According to the mass ratio of fine-grained vanadium-containing stone coal to water: 1:0.06~0.07, add water to the fine-grained vanadium-containing stone coal, granulate, and obtain pellets with a particle size of 3-8 mm, and dry , to obtain dried pellets.
步骤三、将干燥后的小球置于工业微波焙烧设备中作为铺底料铺于底层，再将粗粒级含钒石煤置于铺底料之上，微波焙烧，冷却至室温，得到含钒石煤焙烧料。 Step 3: Place the dried pellets in an industrial microwave roasting equipment as a base material and spread them on the bottom layer, then place the coarse-grained vanadium-containing stone coal on the base material, microwave roasting, and cool to room temperature to obtain vanadium-containing stone Coal roasting material.
所述微波焙烧的升温速率为25~35℃/min，微波焙烧的温度为750~780℃，恒温焙烧的时间为25~30min。 The heating rate of the microwave roasting is 25-35° C./min, the temperature of the microwave roasting is 750-780° C., and the constant-temperature roasting time is 25-30 minutes.
本实施例1在微波焙烧过程中，烧结部分的物料量占总物料量的比为0.3~0.9%；本实施例1制得的含钒石煤焙烧料经恒温搅拌酸浸，钒浸出率为80~85%。 In the microwave roasting process of this embodiment 1, the ratio of the amount of material in the sintered part to the total amount of material is 0.3% to 0.9%; 80~85%.
实施例2Example 2
一种防烧结的含钒石煤微波焙烧方法。所述方法的具体步骤是： A anti-sintering microwave roasting method for vanadium-containing stone coal. The concrete steps of described method are:
步骤一、先将含钒石煤破碎至粒径小于6mm，再分为粗粒级含钒石煤和细粒级含钒石煤，粗粒级含钒石煤的粒径小于6mm且大于等于1mm，细粒级含钒石煤粒径小于1mm。 Step 1. First crush the vanadium-containing stone coal until the particle size is less than 6mm, and then divide it into coarse-grained vanadium-containing stone coal and fine-grained vanadium-containing stone coal. The particle size of the coarse-grained vanadium-containing stone coal is less than 6mm and greater than or equal to 1mm, the particle size of fine-grained vanadium-containing stone coal is less than 1mm.
步骤二、按细粒级含钒石煤︰水的质量比为1︰0.07~0.08，向细粒级含钒石煤中加水混合，制粒，得到粒径为3~5mm的小球，干燥，得到干燥后的小球。 Step 2. According to the mass ratio of fine-grained vanadium-containing stone coal to water: 1:0.07~0.08, add water to the fine-grained vanadium-containing stone coal, granulate, and obtain pellets with a particle size of 3-5mm, and dry , to obtain dried pellets.
步骤三、将干燥后的小球置于工业微波焙烧设备中作为铺底料铺于底层，再将粗粒级含钒石煤置于铺底料之上，微波焙烧，冷却至室温，得到含钒石煤焙烧料。 Step 3: Place the dried pellets in an industrial microwave roasting equipment as a base material and spread them on the bottom layer, then place the coarse-grained vanadium-containing stone coal on the base material, microwave roasting, and cool to room temperature to obtain vanadium-containing stone Coal roasting material.
所述微波焙烧的升温速率为35~45℃/min，微波焙烧的温度为780~820℃，恒温焙烧的时间为30~35min。 The heating rate of the microwave roasting is 35-45° C./min, the temperature of the microwave roasting is 780-820° C., and the constant-temperature roasting time is 30-35 minutes.
本实施例2在微波焙烧过程中，烧结部分的物料占总物料量的比例为0.8~2.3%；本实施例2制得的含钒石煤焙烧料经恒温搅拌酸浸，钒浸出率为84~88%。 In the microwave roasting process of this embodiment 2, the ratio of the material in the sintered part to the total material amount is 0.8 to 2.3%; the vanadium-containing stone coal roasted material obtained in the present embodiment 2 is subjected to constant temperature stirring and acid leaching, and the vanadium leaching rate is 84%. ~88%.
实施例3Example 3
一种防烧结的含钒石煤微波焙烧方法。所述方法的具体步骤是： A anti-sintering microwave roasting method for vanadium-containing stone coal. The concrete steps of described method are:
步骤一、先将含钒石煤破碎至粒径小于6mm，再分为粗粒级含钒石煤和细粒级含钒石煤，粗粒级含钒石煤的粒径小于6mm且大于等于1mm，细粒级含钒石煤粒径小于1mm。 Step 1. First crush the vanadium-containing stone coal until the particle size is less than 6mm, and then divide it into coarse-grained vanadium-containing stone coal and fine-grained vanadium-containing stone coal. The particle size of the coarse-grained vanadium-containing stone coal is less than 6mm and greater than or equal to 1mm, the particle size of fine-grained vanadium-containing stone coal is less than 1mm.
步骤二、按细粒级含钒石煤︰水的质量比为1︰0.08~0.09，向细粒级含钒石煤中加水混合，制粒，得到粒径为5~8mm的小球，干燥，得到干燥后的小球。 Step 2. According to the mass ratio of fine-grained vanadium-containing stone coal to water: 1:0.08~0.09, add water to the fine-grained vanadium-containing stone coal, granulate, and obtain pellets with a particle size of 5-8mm, and dry , to obtain dried pellets.
步骤三、将干燥后的小球置于工业微波焙烧设备中作为铺底料铺于底层，再将粗粒级含钒石煤置于铺底料之上，微波焙烧，冷却至室温，得到含钒石煤焙烧料。 Step 3: Place the dried pellets in an industrial microwave roasting equipment as a base material and spread them on the bottom layer, then place the coarse-grained vanadium-containing stone coal on the base material, microwave roasting, and cool to room temperature to obtain vanadium-containing stone Coal roasting material.
所述微波焙烧的升温速率为45~55℃/min，微波焙烧的温度为820~850℃，恒温焙烧的时间为35~40min。 The heating rate of the microwave roasting is 45-55° C./min, the temperature of the microwave roasting is 820-850° C., and the constant-temperature roasting time is 35-40 minutes.
本实施例3在微波焙烧过程中，烧结部分的物料量占总物料量的比为2~2.6%；本实施例3制得的含钒石煤焙烧料经恒温搅拌酸浸，钒浸出率为81~85%。 In the microwave roasting process of this embodiment 3, the ratio of the amount of material in the sintered part to the total amount of material is 2 to 2.6%; 81~85%.
本具体实施方式与现有技术相比具有如下的有益效果： Compared with the prior art, this specific embodiment has the following beneficial effects:
1、本具体实施方式将细粒级含钒石煤制粒成粒径为3~8mm的小球作为铺底料，与1~6mm粒径的含钒石煤一起焙烧，提高了含钒石煤微波焙烧的入炉粒径，改善了料堆的透气性，显著地减少了微波焙烧过程中含钒石煤的烧结现象，使得焙烧作业能够顺利进行，提高了焙烧效率。 1. In this specific embodiment, the fine-grained vanadium-containing stone coal is granulated into small balls with a particle size of 3-8mm as the bottoming material, and roasted together with the vanadium-containing stone coal with a particle size of 1-6mm, which improves the vanadium-containing stone coal. The particle size of the microwave roasting improves the air permeability of the stockpile, significantly reduces the sintering phenomenon of vanadium-containing stone coal during the microwave roasting process, makes the roasting operation go smoothly, and improves the roasting efficiency.
2、本具体实施方式在控制含钒石煤微波焙烧入炉粒级的同时，控制微波焙烧过程的升温速率为25~55℃/min，焙烧温度为750~850℃，恒温焙烧时间为25~40min，能够充分发挥微波焙烧的优势，焙烧效果好。 2. In this specific embodiment, while controlling the microwave roasting of vanadium-containing stone coal into the furnace particle size, the heating rate of the microwave roasting process is controlled to be 25~55°C/min, the roasting temperature is 750~850°C, and the constant temperature roasting time is 25~50°C. 40 minutes, can give full play to the advantages of microwave roasting, and the roasting effect is good.
3、本具体实施方式在微波焙烧过程中，烧结部分的物料量占总物料量的比小于3%；本具体实施方式制得的含钒石煤焙烧料经恒温搅拌酸浸，钒浸出率大于80%。 3. In the microwave roasting process of this specific embodiment, the ratio of the amount of material in the sintered part to the total amount of material is less than 3%; the vanadium-containing stone coal roasted material prepared by this specific embodiment is subjected to constant temperature stirring and acid leaching, and the vanadium leaching rate is greater than 80%.
因此，本具体实施方式能显著减少含钒石煤微波焙烧过程中的烧结现象，微波焙烧效果好。 Therefore, this specific embodiment can significantly reduce the sintering phenomenon in the microwave roasting process of the vanadium-containing stone coal, and the microwave roasting effect is good.
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