Separating and Extracting of Vanadium and Titanium
Study on migration and transformation behavior of elements during vanadium extraction by calcification
Liu Xi, Pu Yuwen, Xu Zongyuan, Tang Kang, Zheng Guocan, Chen Yan, Liu Zuohua, Du Jun, Peng Yi, Tao Changyuan
2023, 44(4): 1-9.   doi: 10.7513/j.issn.1004-7638.2023.04.001
Abstract(25) HTML(4) PDF(12)
Combined with XRD, XPS, SEM-EDS and ICP-OES characterizations, the phase composition and morphology of acid ammonium salt precipitation vanadium products under different pH values were studied; also the migration and transformation behavior of V, Fe and Mn were analyzed when the pH value of vanadium precipitation was 2.20. The results show that the pH value of vanadium precipitation significantly affects the composition and morphology of the product. The filter cake of vanadium precipitation is amorphous at low pH value, and the crystal form is gradually determined with the increase of pH value. V exists in the form of CaV2O6 in vanadium extraction tailings, polyvanadate in filter cake, and V2O5 in the final product. The main forms of Fe in tailings are Fe2O3 and Fe2TiO5, which are less abundant in vanadium filter cake and final product. Mn exists in the form of MnSO4 in the tailings, and mainly enters the supernatant during vanadium precipitation, while MnV2O6·4H2O exists in the filter cake and with 0.210% in the final product.
Application of Vanadium and Titanium
Study on the microstructure and properties of the transition region of IN625/TC4 bimetallic structure by laser melting deposition with Cu interlayer
Wang Wenbo, Xu Nuo, Xu Guojian, Jing Zhicheng, Zhang Guoyu, Zhao Xue, Xiang Zhuo
2023, 44(4): 48-54.   doi: 10.7513/j.issn.1004-7638.2023.04.007
Abstract(15) HTML(5) PDF(1)
The bimetallic structure composed of IN625 nickel-based high-temperature alloy with excellent high-temperature properties and lightweight and high-strength TC4 titanium alloy has broad application prospects in the aerospace field. However, due to the large differences in physical and chemical properties of the two metals, the direct fabrication of IN625/TC4 bimetallic structure inevitably results in the formation of metallurgical defects such as cracks in the transition region, so the effective connection of IN625/TC4 bimetallic structure has been a hot spot and a difficult area of research in the industry. In this work, laser melting deposition technology was used to prepare IN625/TC4 bimetallic structure without cracks and other metallurgical defects by adding Cu interlayer, and studied the microstructure and mechanical properties of the transition region. The results show that the phase composition inside the transition region of the IN625/TC4 bimetallic structure deposited by laser melting with Cu interlayer is mainly γ-Ni, γ-Cu, (Cr, Mo), Ti2Cu, TiCu, TiNi3, α-Ti and β-Ti. Tensile results at room temperature indicate that the tensile strength of the IN625/TC4 bimetallic structure with Cu interlayer is about 228.9 MPa. The fracture location is near the Cu/IN625 transition region, and the fracture morphology shows quasi-dissociative fracture characteristics.
Resources Environment and Energy Saving
Experimental research on the recycling of valuable metal elements with the extracted-vanadium residues reduced by biomass
Gao Yang, Xie Huaqing, Zhou Mi, Guo Rui, Qin Mengxin, Wang Zhengyu, Dai Bing
2023, 44(4): 89-95.   doi: 10.7513/j.issn.1004-7638.2023.04.014
Abstract(13) HTML(6) PDF(1)
In order to solve the problems of land resources waste and environmental pollution caused by accumulation of vanadium extraction tailings, two kinds of vanadium extraction tailings were studied in this paper. Biomass was used as reducing agent for high temperature reduction experiment, and the component analysis and phase analysis of reduction products were carried out to explore the influences of oxygen absorption ratio, time and temperature on metallization rate of reduction products. The results show that the iron metallization rate can reach 58.67% when the oxygen absorption ratio is 4, the reduction temperature is 1450 ℃ and the reduction time is 2 h. The chromium metallization rate of vanadium-precipitated waste slag can reach 99.19% when the oxygen absorption ratio is 1.75, the reduction temperature is 1550 ℃ and the reduction time is 4 h. Two kinds of vanadium extracting tailings were mixed to prepare ferrochromium alloy by high temperature reduction of biomass. The preliminary experiment proved that the reduction product was melted under the condition of oxygen absorption ratio of 4, reduction time of 3 hours and reaction temperature of 1550 ℃. The content of chromium in the alloy was 61.51%, the content of iron was 31.05%, and the content of elements met the national standard requirements of FeCr65C4.0 alloy.
Ferrous Metallurgy and Materials
Effect of preformed calcium ferrite addition on sintering behavior of vanadium titanomagnetite
Xie Hao, Li Gang, Lv Xuewei, Sun Xiaodong, He Haixi
2023, 44(4): 117-124.   doi: 10.7513/j.issn.1004-7638.2023.04.018
Abstract(13) HTML(7) PDF(0)
In view of the problems of low yield, poor strength and high energy consumption in the sintering process of vanadium titanomagnetite, a new sintering technology of preformed calcium ferrite is proposed in this paper, and its feasibility and theoretical basis are revealed through the tablet sintering and thermal analysis test. The results show that with the increase of substitution ratio (preformed calcium ferrite to partially substitute CaO), the microstructure of roasted products changes from granular structure to melting corrosion structure, the content of SFCA increases, while perovskite content decreases. In addition, the quantity of melts increases, the coalesce of sintering bubbles is promoted, the average porosity decreases from 42.9% to 36.2%, and the densification of the matrix is promoted. The formation of calcium ferrite melts in the heating process can be divided into three reactions, according to the formation temperature from low to high, it is the eutectic reaction of CF+CF2 → L, the melting of SFCA-I and SFCA, respectively; the addition of preformed calcium ferrite can reduce the generation temperature of initial melts, and increase the total sintering melts by about 9 %; promote the melting of iron oxides into the initial melts, increase the content of calcium ferrite, and promote solid-liquid assimilation reaction.
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](965) [FullText HTML](680) [PDF 867KB](309)
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](260) [FullText HTML](76) [PDF 546KB](123)
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](181) [FullText HTML](27) [PDF 2017KB](71)
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](161) [FullText HTML](28) [PDF 720KB](24)
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](219) [FullText HTML](23) [PDF 850KB](85)
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%。
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](788) [FullText HTML](128) [PDF 1046KB](294)


Current research status of advanced forming technology for high-performance titanium alloys
Li Junzhao, Sun Qingjie, Yu Hang
2021, 42(6): 17-27.   doi: 10.7513/j.issn.1004-7638.2021.06.002
[Abstract](286) [FullText HTML](49) [PDF 1729KB](98)
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](251) [FullText HTML](17) [PDF 1339KB](110)
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](206) [FullText HTML](19) [PDF 1313KB](109)
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。
Microstructure and high temperature tensile properties of (TiC+TiB) reinforced titanium matrix composites by vacuum induction suspension melting
Wang Zhenling, Yu Yucheng, Li Ruizhi, Li Qiang, Han Jiaping, Ma Lan
2021, 42(5): 54-61.   doi: 10.7513/j.issn.1004-7638.2021.05.009
[Abstract](183) [FullText HTML](17) [PDF 1437KB](88)
利用真空感应悬浮熔炼炉制备了(TiC+TiB)/Ti-6Al-4Sn-8Zr-0.8Mo-1.5Nb-1W-0.25Si复合材料,增强体占比分别为0%、2%、4%(体积比)。利用金相显微镜、SEM、XRD、TEM和高温拉伸试验机研究了其显微组织和高温拉伸性能。结果表明:钛合金主要由α-Ti相和Ti2ZrAl相组成,Ti2ZrAl相分布在α-Ti片层交界位置。同时,复合材料中还存在多边形块状TiC和TiB长晶须。钛合金组织为典型的魏氏组织,在β-Ti晶粒内α-Ti相长成近平行排列的长针状。钛基复合材料中随着增强体数量增加,α-Ti长径比显著减小,β-Ti晶粒细化。在650~700 ℃范围钛基复合材料强度显著提高,2%增强体复合材料在650 ℃强化效果最优,4%增强体复合材料在700 ℃强化效果最优。温度超过700 ℃后,增强体强化效果减弱。复合材料塑性总体较低。钛基复合材料强化方式为细晶强化、固溶强化和载荷传递强化。高温拉伸时钛基复合材料的断裂方式为脆性断裂。
Report on China titanium industry in 2022
An Zhongsheng, Chen Yan, Zhao Wei
2023, 44(3): 1-8.   doi: 10.7513/j.issn.1004-7638.2023.03.001
[Abstract](413) [FullText HTML](94) [PDF 1967KB](94)
The overall situation of China titanium industry was analyzed on the basis of capacity, output, application, and import and export amount of titanium concentrate, titanium sponge, titanium ingot and titanium materials in 2022. The existed problems and the corresponding suggestions were also proposed.
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](965) [FullText HTML](680) [PDF 867KB](680)
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.