Separating and Extracting of Vanadium and Titanium
Development and analysis on 2022 titanium dioxide industry in China
Bi Sheng
2023, 44(1): 1-3.   doi: 10.7513/j.issn.1004-7638.2023.01.001
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This paper summarizes and sorts the operational data of titanium dioxide industry in China in 2022, such as production capacity, yield, apparent market demand, production capacity distribution, etc., and focuses on analyzing the recent growth trend of titanium dioxide production capacity and the corresponding changes in the supply and demand relationship of titanium ore raw materials. It is pointed out that the yield and production capacity of titanium dioxide in 2022 will continue to maintain an increasing trend, and the concentration of production capacity will be further improved. At the same time, the further expansion of the scale of existing producers and the increase of joining projects outside the industry will lead to the shortage of titanium ore supply. In addition, with the rise of the green new energy battery material industry, a large number of iron phosphate or lithium iron phosphate project construction or preparation, will lead to the surge of titanium dioxide production capacity, aggravate the contradiction between titanium ore supply and demand; then the market prospects and industry outlook is worrying, all parties should pay close attention to and timely adjust.
Application of Vanadium and Titanium
Synthesis and sodium storage properties of V2O5/graphene nanocomposites
Zheng Hao, Peng Yi, Wang Shiwei, Meng Weiwei, Du Guangchao
2023, 44(1): 32-37.   doi: 10.7513/j.issn.1004-7638.2023.01.007
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Vanadium pentoxide (V2O5) has attracted extensive attention due to its layered structure, abundant resources, high capacity, low cost, high Na+ ionic conductivity, small volume change during Na-ion insertion/extraction, and mesopotential platform. V2O5/graphene nanocomposites were successfully prepared by hydrothermal method, using oxalic acid and V2O5 as raw materials. The results show that the V2O5 nanowires and graphene are closely intertwined with each other, forming a V2O5-graphene nanocomposite with a tightly network structure. The structure can provide fast electron transfer kinetics, expand the effective contact area between the electrolyte and the electrode material, improve the conductivity of the material and buffer volume changes during Na-ion insertion/extraction. Thus, the electrochemistry properties of V2O5/rGO nanocomposites are effectively improved (Over 100 cycles, 154 mAh/g at 100 mA/g).
Resources Metallurgy and Materials
Study on the technology of enhanced reduction-magnetic separation of titanium and iron from calcium-based vanadium extraction tailings
Gao Feng, Du Hao, Liu Biao, Wang Shaona, Liang Peng, Zhang Yi
2023, 44(1): 84-91.   doi: 10.7513/j.issn.1004-7638.2023.01.015
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In this paper, the direct reduction-magnetic separation method was used to recover Fe from vanadium titano-magnetite (VTM) tailings. Under the conditions of reduction temperature 1250 ℃, reduction time 2 h and reducing agent dosage 20% of the mass of the tailings, the metallization rate of pellets was 92.71%. After adding 5% CaCO3 and prolonging the holding time to 6 h, the average diameter of Fe grains increased from 14.53 μm to 25.39 μm. By fitting the growth rate of Fe grains, it was found that the grains growth rate constant increased from 0.26 μm2/min to 1.45 μm2/min after adding CaCO3. After magnetic separation, the direct reduced iron with TFe content of 90.72% and the titanium slag with TiO2 content of 41.75% could be obtained. The recovery rate of Fe reached 91.05%, which greatly improved the resource utilization of VTM.
Ferrous Metallurgy and Materials
Non-isothermal reduction kinetics of carbon-coated vanadium-titanium magnetite powder
Gao Yice, Hao Suju, Jiang Wufeng, Zhang Yuzhu, Bo He
2023, 44(1): 111-118.   doi: 10.7513/j.issn.1004-7638.2023.01.019
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To accurately explore the dynamics of carbon reduction reaction of vanadium-titanium magnetite powder, the test was conducted by hydrothermal method without adding any modifier. Carbon-coated vanadium-titanium magnetite powder was prepared with glucose as carbon source. The heating curves of weightlessness of carbon-coated vanadium-titanium magnetite powder obtained under different heating rate of 5, 7.5, 10, 15, 12.5, 1 5 K/min were measured by high temperature comprehensive thermal analyzer . Combined with the FWO formula and CR formula, the experimental data were calculated,as well as the kinetic parameters of carbon-coated vanadium-titanium magnetite powder. The results show that the weight loss rate of carbon-coated vanadium-titanium magnetite powder in a certain temperature range is proportional to the amount of carbon coating and the heating rate. The activation energy in this reaction is about 73.533 kJ/mol with a reaction mechanism of tertiary chemical reaction model.
Status of titanium dioxide industry in China and the development prospect
Bi Sheng
2021, 42(2): 1-4.   doi: 10.7513/j.issn.1004-7638.2021.02.001
[Abstract](207) [FullText HTML](62) [PDF 546KB](34)
Report on China titanium industry in 2020
Jia Hong, Lu Fusheng, Hao Bin
2021, 42(3): 1-9.   doi: 10.7513/j.issn.1004-7638.2021.03.001
[Abstract](726) [FullText HTML](406) [PDF 867KB](170)
Study on beneficiation process of a low grade ilmenite in Panxi
Yang Daoguang
2022, 43(3): 111-117.   doi: 10.7513/j.issn.1004-7638.2022.03.018
[Abstract](88) [FullText HTML](3) [PDF 720KB](13)
Inclusion analysis in magnesium free-cutting steel
Zhu Qiangbin, Li Jie, Deng Xiangyang, Tian Qianren, Zeng Zhiqi, Fu Jianxun
2021, 42(2): 179-187, 192.   doi: 10.7513/j.issn.1004-7638.2021.02.029
[Abstract](143) [FullText HTML](5) [PDF 2017KB](8)
Study on microalloying and heat treatment process of spring steel 55SiCrV
Meng Jian
2021, 42(3): 187-192.   doi: 10.7513/j.issn.1004-7638.2021.03.028
[Abstract](151) [FullText HTML](9) [PDF 850KB](5)
在弹簧钢55SiCr成分基础上进行钒微合金化处理,获得了55SiCrV,通过淬火+回火正交试验、显微组织观察、力学性能测试和X射线衍射等手段,研究并分析了淬火+回火工艺对弹簧钢55SiCrV微观组织和力学性能的影响,结果表明:0.20%V的添加可使55SiCrV组织中存在大量弥散均匀分布的10~35 nm含钒析出相,强化效果最佳。淬火+回火处理可以改变55SiCrV的显微组织比例,其中的残余奥氏体可以降低强度和增加塑性,55SiCrV获得最佳力学性能匹配(Rm=1 815 MPa、Z=28%)的热处理工艺为900 ℃淬火+430 ℃回火,对应其残余奥氏体含量为2.3%。
Study on selective separation of vanadium, titanium and tungsten from spent SCR denitration catalyst
Zhang Zhenquan, Zhao Beibei, Li Lanjie, Dong Zihui, Bai Ruiguo, Wang Haixu
2021, 42(1): 24-31.   doi: 10.7513/j.issn.1004-7638.2021.01.004
[Abstract](239) [FullText HTML](64) [PDF 1190KB](16)
分别采用NaOH、HCl浸出废SCR催化剂,碳酸钠焙烧-水浸废SCR催化剂选择性分离钛。试验表明:碳酸钠焙烧-水浸废催化剂可实现钛与钒、钨高效分离。较优工艺条件:焙烧温度850 ℃,焙烧时间3 h,碳酸钠与废催化剂质量比为1.3,浸出温度95 ℃,浸出时间1 h,搅拌速度500 r/min。V、As、W的浸出率分别为52.26%,98.24%和99.9%。采用硫酸浸出废SCR催化剂钠化焙烧渣实现高效提取钛。工艺条件:上述较优条件焙烧渣,40%硫酸,液固比4∶1,浸出温度90 ℃,浸出时间3 h,搅拌速度500 r/min。钛的浸出率为93.4%。采用自生晶种水解法制备偏钛酸,钛水解率为94.05%,偏钛酸纯度为94.07%。
Effect of ESR on oxygen content and inclusions in GCr15 bearing steel
Chang Kaihua, Xu Tao, Zhu Chunli, Zhang Longfei, Su Yunlong, Shi Xiaofang, Chang Lizhong
2021, 42(4): 175-181.   doi: 10.7513/j.issn.1004-7638.2021.04.029
[Abstract](217) [FullText HTML](8) [PDF 1339KB](11)
Application of rutile nano titanium dioxide in coatings
Wu Jianchun
2021, 42(1): 43-49.   doi: 10.7513/j.issn.1004-7638.2021.01.007
[Abstract](176) [FullText HTML](6) [PDF 1313KB](4)
利用透射电镜(TEM)对纳米二氧化钛的形貌和粒度进行分析后,将纳米二氧化钛制成乳胶漆、汽车漆、家具漆和防腐漆,对其进行耐候性、随角异色等性能分析。结果表明,金红石纳米二氧化钛可大幅度提高乳胶漆的耐候性、耐水性、耐碱性和耐洗刷性能,可提高家具漆和防腐漆的耐候性;纳米二氧化钛和铝粉配合制成的汽车漆具有随角异色效果,二氧化钛的粒度对其随角异色性能有很大影响,平均粒径为280 nm的普通颜料钛白改性铝粉漆无随角异色效果,平均粒径为35 nm的纳米二氧化钛改性铝粉漆有显著的随角异色效果,并且随纳米二氧化钛加量的增加,其不同角度的颜色差异增大。
Effect of annealing temperature on microstructure and mechanical properties of vanadium microalloyed 780 MPa cold rolled dual phase steel
Yu Cansheng, Zhang Longchao, Zheng Zhiwang, Gong Hui, Zhang Dafu
2021, 42(5): 158-163.   doi: 10.7513/j.issn.1004-7638.2021.05.024
[Abstract](129) [FullText HTML](4) [PDF 883KB](8)
将钒微合金化试验钢分别加热至780、800、820 ℃和840 ℃保温一段时间后,依次经过缓慢冷却、快速冷却、模拟镀锌后,空冷至室温。研究结果表明,780 ℃退火时微观组织均匀性较差且发现未溶解的碳化物,导致强度和塑性均不佳。随着退火温度的升高,铁素体尺寸及分数逐渐降低,中低温转变产物含量逐步增加且其尺寸有所粗化。当退火温度为800 ℃时,马氏体含量达到最大,当退火温度进一步升高时,马氏体含量有所降低,而贝氏体含量则有所增加,导致抗拉强度在800~840 ℃范围内变化不大,而延伸率先升高后降低。当退火温度为820 ℃ 时,带钢获得较佳的力学性能,屈服强度、抗拉强度、屈强比、断后伸长率A80和扩孔率分别为486 MPa、835 MPa、0.58、16.0%和27%。
Current situation of resource utilization of waste acid from titanium dioxide production
Gao Guangyan, Gao Likun, Rao Bing, Wang Feiwang, Shen Hairong
2021, 42(5): 99-108.   doi: 10.7513/j.issn.1004-7638.2021.05.016
[Abstract](258) [FullText HTML](44) [PDF 1047KB](18)
Report on China titanium industry in 2020
Jia Hong, Lu Fusheng, Hao Bin
2021, 42(3): 1-9.   doi: 10.7513/j.issn.1004-7638.2021.03.001
[Abstract](726) [FullText HTML](406) [PDF 867KB](406)
The overall situation of China titanium industry was analyzed in basis of the production capacity, application and import & export amount of titanium concentrate, titanium sponge, titanium ingot and titanium materials in 2020. The existed problems and the corresponding suggestions were also proposed.
Global vanadium industry development report 2020
Wu You, Chen Donghui, Liu Wuhan, Sun Zhaohui, Zhang Bangxu
2021, 42(5): 1-9.   doi: 10.7513/j.issn.1004-7638.2021.05.001
[Abstract](532) [FullText HTML](77) [PDF 1046KB](77)

The overall situation of the global vanadium industry was elaborated and analyzed from the global vanadium resources and the production capacity, the output, supply and demand, import and export, as well as the market prices of vanadium pentoxide, ammonium metavanadate, ferrovanadium and vanadium-nitrogen (VN) alloys in 2020. The major events in the global vanadium battery field are also introduced. Based on the current operating situation of the vanadium industry at home and abroad, the outlook for the market is forecasted, and it is believed that the global vanadium expansion situation will not be greatly changed in the short term, and the oversupply will bring about the price fluctuation of vanadium products in the specific range. The Chinese market under the background of “efforts to achieve carbon peak and neutrality goals” is still the main focus for global vanadium demand, and VN alloys will also be the trend of vanadium products in the near and mid-term. Collaborative innovation between vanadium enterprises will promote the vanadium industry to gradually show a positive “competition and cooperation” situation.