Separating and Extracting of Vanadium and Titanium
Synthesis of porous bentonite modified titanium-lithium ion sieve precursor
Huang Chenghua, Li Yan, Zhang Jingjing, Shui Yi, Wu Na, Zhang Liyuan
2022, 43(3): 1-8.   doi: 10.7513/j.issn.1004-7638.2022.03.001
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Abstract:
The lithium titanate precursor sol was prepared by inorganic precipitation-peptization method with titanium sulfate as titanium source, lithium acetate as lithium source, followed by adding bentonite as modifier. Bentonite modified Li2TiO3 powder was obtained after stirring, aging, drying and calcination. The effects of molar ratio (R) of complexing agent H2O2 to Ti, calcination temperature, solid-liquid ratio of bentonite to sol on the surface morphology and crystal structure of precursor Li2TiO3 were studied. The samples were characterized by scanning electron microscopy, X-ray diffraction, thermogravimetry-differential scanning calorimetry and infrared spectroscopy. The results show that the crystal structure of unmodified Li2TiO3 is the most complete when calcined at 750 ℃ with R = 6. After the sample was modified by bentonite with a solid-liquid ratio of 1.67 g/L, the crystallinity of each crystal surface was the most complete when the calcination temperature was 750 ℃, and Li2TiO3 with uniform porous structure on the surface was obtained.
Application of Vanadium and Titanium
Study on vacuum electron beam welding process of 50 mm thick plate TC4 and TA17 titanium alloys
Li Dadong, Bai Wei, Deng Jian, Chen Rong, Geng Naitao
2022, 43(3): 40-46.   doi: 10.7513/j.issn.1004-7638.2022.03.007
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Abstract:
Based on the analysis of the density, specific heat and thermal conductivity of TC4 and TA17 titanium alloys by using JMATPRO thermodynamic software, the vacuum electron beam welding experiments of TC4 and TA17 titanium alloys with a thickness of 50 mm were carried out. The parameters of high and medium voltage accelerating voltage, different welding beam current and welding speed were designed. The effects of welding process parameters on weld width, penetration and weld forming coefficient were studied. The test results show that the penetration and weld forming coefficient of TC4 titanium alloy are higher than TA17 under the same welding process parameters. The influence of welding beam current on penetration and weld forming coefficient is the most prominent. The high voltage of accelerating voltage 150 kV is more suitable for vacuum electron beam welding of large and thick titanium alloys.
Mining & Beneficiation
Experimental study on optimization of flotation reagents for ilmenite froman iron dressing tailing in Panxi area
Deng Jian, Yang Yaohui, Wang Hongbin, Yan Weiping, Zeng Xiaobo
2022, 43(3): 77-83.   doi: 10.7513/j.issn.1004-7638.2022.03.013
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Abstract:
In this paper, the optimization test of ilmenite flotation reagents was carried out for an iron dressing tailing in Panxi. With a TiO2 grade of 16.6%, this tailing is mainly composed of ilmenite, titanomagnetite, pyroxene and olivine, and the secondary minerals are plagioclase and chlorite. The types and dosages of collectors, inhibitors and sulfuric acid were optimized. Using the combination of sulfuric acid, EMA and MOH, a five-time titanium concentration process was obtained, including iron removal by magnetic separation, flotation desulfurization, one rough selection and one sweep selection. Under the optimal conditions, a good index of titanium concentrate yield of 25.18%, TiO2 grade of 46.48% and recovery of 71.31% can be obtained in the closed circuit test, which provides a technical reference for the recovery of ilmenite from iron separation tailings in Panxi mining area.
Ferrous Metallurgy and Materials
Study on high temperature properties and optimal ore blending of Pangang iron ore powder
Hu Peng, Tang Wenbo, Huang Chu, Rao Jiating, Yang Mingrui
2022, 43(3): 118-124.   doi: 10.7513/j.issn.1004-7638.2022.03.019
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Abstract:
The results from micro sintering test on high temperature properties of Pangang iron ore power show that the assimilation temperature of high V-Ti magnetite used in Pangang exceeds 1 320 ℃, while the liquid phase fluidity index is only 0.1 and the bonding phase strength is greater than 3 500 N. It is necessary to improve the performance of sinter blending by optimizing ore blending. Therefore, the ore blending was optimized based on high temperature performance, and the sintering verification tests had been conducted. It is found out that the content of TiO2 has a great influence on the high temperature sintering properties of iron ore powder. When TiO2 content decreases from 7.0% down to 3.0%, the assimilation temperature of mixed ore decreases from 1 305 ℃ to 1 280 ℃, the liquid phase fluidity index is increased from 0.42 to 0.78, and the bonding phase strength decreases from 2 640 N to 1 915 N. The sinter yield, drum strength, and medium and low temperature properties are significantly improved. During the sintering process, the calcium titanium mineral phase with dense structure and high melting point formed by the reaction of TiO2 and CaO decreases, and the calcium ferrite phase increases.
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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](153) [FullText HTML](50) [PDF 546KB](17)
摘要:
总结回顾了中国钛白粉工业2019、2020年的各项行业数据和表现,分析了当前面临的形势及发展趋势,认为高质量发展成为钛白粉行业未来发展的主旋律,钛白粉产能集中度虽有提高,但洗牌效应短期内难以呈现,这也是行业发展的一个难题,另外行业监管、氯化法钛原料问题、环保及清洁生产问题仍不容忽视。
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](128) [FullText HTML](4) [PDF 1313KB](2)
摘要:
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。
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](155) [FullText HTML](21) [PDF 1047KB](8)
摘要:
钛白废酸中含有可观的资源,废酸的再加工与增值正逐渐成为钛颜料工业的焦点。针对硫酸法钛白副产废酸的回收与利用现状展开综述,主要介绍了废酸在提取金属元素、浸出金属元素、回收硫酸以及工业生产方面的应用,并在此基础上,对今后钛白废酸资源化利用的发展做了相关展望,以期为相关行业的从业者带来废酸利用方面的参考。
Effect of TiO2 on physicochemical properties and structure of high-alumina blast furnace slag
Yan Hua, Liu Huajun, Chen Buxin, Hu Meilong
2022, 43(2): 118-124.   doi: 10.7513/j.issn.1004-7638.2022.02.018
[Abstract](7) [FullText HTML](0) [PDF 1822KB](1)
摘要:
随着国内各钢铁企业高炉配加经济性较高的高铝原料的增加,炉渣中Al2O3含量增加,渣铁流动性变差,给高炉冶炼带来一系列问题。以CaO-SiO2-Al2O3-MgO-TiO2五元渣系为研究对象,通过相图理论计算结合试验研究和炉渣结构分析,研究了高铝渣中不同TiO2含量(低钛:5%,中钛:15%,高钛:25%)对高铝高炉渣黏度、熔化性温度的影响,并通过炉渣结构研究解析了影响炉渣物化性能的原因。结果表明:固定碱度R2为1.25,TiO2质量分数增加至25%过程中,炉渣熔化温度先下降后增高,当TiO2质量分数为7%时,炉渣液相析出相由斜长石类的钙铝硅酸盐(Ca2Al2SiO7)转变为高熔点钛酸钙(CaTiO3),其熔点为1975 ℃,炉渣熔化温度增加;TiO2含量由低钛5%增加至高钛25%时,炉渣黏度和熔化性温度均降低。温度越高,炉渣流动性越好,渣中TiO2以[TiO6]8-八面体结构存在,可使渣中复杂硅氧网状结构解体;TiO2含量由5%增加至25%时,炉渣中复杂结构单元Si(Q2 + Q3)的含量降低,简单结构单元Si(Q0 + Q1)的含量升高,Si(Q2 + Q3)/Si (Q0 + Q1)降低,炉渣结构简单化,即炉渣中无论是在低钛、中钛、还是高钛含量,TiO2在炉渣中起炉渣修饰子作用,对降低炉渣黏度、改善炉渣流动性有积极作用,可作为高铝冶炼调控手段之一。
Study on technology for preparation of high-purity vanadium pentoxide for aviation materials
Liu Chao, Li Haijun, Zhu Jianyan, Hu Zhiwei
2021, 42(1): 38-42.   doi: 10.7513/j.issn.1004-7638.2021.01.006
[Abstract](164) [FullText HTML](9) [PDF 1057KB](7)
摘要:
针对低品位钒渣生产高纯五氧化二钒工艺的生产流程,从提高钒回收率、降低生产资源及能源消耗、提高多钒酸铵品位、提高五氧化二钒品位、降低产品杂质等多方面进行了系统性研究,使钒渣转换率达到86%以上,多钒酸铵品位达到89.5%以上,五氧化二钒品位达到99%以上,各项杂质含量和高密度金属夹杂物控制等达到高端客户美国大型跨国集团肯纳、雷丁钛合金企业的要求。
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](409) [FullText HTML](183) [PDF 867KB](79)
摘要:
从2020年我国钛工业钛精矿、海绵钛、钛锭、钛材等品种的产能、产量、应用和进出口等数据分析了我国钛工业的整体情况,并对目前行业存在的问题提出了建议。
Preparation and performance optimization of Co-doped high-titanium blast furnace slag as photocatalytic material
Huo Hongying, Zou Min
2021, 42(1): 65-69.   doi: 10.7513/j.issn.1004-7638.2021.01.011
[Abstract](106) [FullText HTML](1) [PDF 886KB](1)
摘要:
为了实现以非提钛方法对高钛型高炉渣的综合利用,利用其含TiO2可制备光催化剂的特点,以攀钢高钛型高炉渣掺杂硝酸钴为原料,采用液相法掺杂并烧结制备掺杂Co的光催化剂,在紫外光下,考察了煅烧温度、掺杂量及煅烧时间对模拟污染物亚甲基蓝溶液降解率的影响。结果表明:在煅烧温度600 ℃、Co-Ti质量掺杂比(w(Co): w(Ti))0.03、煅烧时间2 h时,制备的掺杂Co光催化剂降解率达到89.0%,比未掺杂之前提高了32.4%。
Review on research progress of high purity vanadium pentoxide preparation by chlorination process
Li Zhuochen, Du Guangchao, Fan Chuanlin, Zhu Qingshan
2021, 42(1): 8-15, 92.   doi: 10.7513/j.issn.1004-7638.2021.01.002
[Abstract](206) [FullText HTML](16) [PDF 1143KB](20)
摘要:
随着全钒液流电池等产业的快速发展,作为关键原料的高纯五氧化二钒,其需求日益增加。在高纯五氧化二钒的众多制备工艺中,氯化法因具有高效清洁、选择性高、产品纯度高等显著优势受到越来越多的关注。针对氯化法制备高纯五氧化二钒的三个关键技术环节:钒原料氯化过程的热力学、动力学和氯化工艺、粗三氯氧钒精制以及三氯氧钒转化制备五氧化二钒的研究进展结合相关文献进行系统评述,其中二次钒资源的高效利用,粗三氯氧钒选择性水解四氯化钛以及三氯氧钒催化氧化制备高纯五氧化二钒是各环节未来的发展方向,此外,开展氯化法制备高纯五氧化二钒的中间试验及关键装备技术的开发是未来实现产业化生产的重点及难点。
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](125) [FullText HTML](5) [PDF 1339KB](7)
摘要:
电渣重熔对于提高钢的纯净度有明显的效果,但对于低氧含量钢种存在增氧现象。通过采用GCr15轴承钢作为自耗电极,研究在大气环境下和Ar保护下使用不同渣系对轴承钢中氧含量及夹杂物的变化规律。研究发现,采用CaF2-Al2O3-CaO三元渣系在氩气保护下电渣重熔GCr15轴承钢时,电渣锭中的氧含量随渣系中的Al2O3含量下降而降低,而使用不含Al2O3渣系重熔的电渣锭中氧含量最低;氩气保护下重熔的电渣锭中的夹杂物直径均比使用同种渣系在空气中重熔的电渣锭要小。氧含量增加主要是因为电渣重熔过程渣池温度过高,导致渣中Al2O3稳定性变差所致。
Analysis on split-head cracking of Y1Cr13 stainless rolled bar
Wu Liangping, Sun Han, Xie Jianbo, Wu Xiangyu, Fu Jianxun
2021, 42(1): 176-183.   doi: 10.7513/j.issn.1004-7638.2021.01.029
[Abstract](121) [FullText HTML](2) [PDF 1764KB](2)
摘要:
针对某厂生产的Y1Cr13不锈钢在轧制过程产生劈头开裂的问题,采用金相显微镜、扫描电子显微镜、小样电解等分析检测方法,从夹杂物微观形貌角度对钢劈头开裂样中硫化物的微观形貌特征进行了表征分析,并探究了Y1Cr13不锈钢轧制时劈头开裂形成的原因。结果表明:该不锈钢轧材存在大量长条状硫化物,硫化物长宽比较大,长宽比分布在3以内的夹杂物占比为65.4%,长宽比大于3的夹杂物占比为34.6%,硫化物的国标评级为:粗系4.5级,细系5.5级,德标评级为3-3级;钢中过多的热脆细长条状硫化锰和锰铁硫化物是劈头开裂的主要原因。采用镁、碲等新工艺可对硫化物形态进行改质,将其控制为球形或纺锤形,并提高硫化物硬度,轧制时不易变形;通过适当减少钢中的[S]含量以及提高钢中Mn/S等措施可减少钢中的(Mn,Fe)硫化物。
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](409) [FullText HTML](183) [PDF 867KB](183)
Abstract:
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](274) [FullText HTML](36) [PDF 1046KB](36)
Abstract:

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.

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