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Progress and Future of Breakthrough Low-carbon Steelmaking Technology (ULCOS) of EU
Issue:
Volume 3, Issue 2, June 2018
Pages:
15-22
Received:
28 May 2018
Accepted:
26 June 2018
Published:
24 July 2018
Abstract: The CO2 emitted by iron and steel industry accounts for 6% of the global anthropogenic CO2 emission. As the control of CO2 emission becomes increasingly stringent all over the world, the iron and steel industry now is facing an unprecedented crisis. And now even the most advanced technologies for reducing carbon emission have reached the bottleneck, so many countries in the world are striving to develop the breakthrough technologies for significantly reducing the carbon emission. The current progress and future research of steelmaking program with ultra-low CO2 emission in Europe are stated, among which TGR-BF, HIsarna, ULCORED, ULCOWIN and ULCOLYSIS are considered to be the most promising technologies. Combined with the technology of carbon capture and storage, CO2 emission can be reduced by as much as 80%. Compared with the traditional technologies, investment cost and operating cost are much lower.
Abstract: The CO2 emitted by iron and steel industry accounts for 6% of the global anthropogenic CO2 emission. As the control of CO2 emission becomes increasingly stringent all over the world, the iron and steel industry now is facing an unprecedented crisis. And now even the most advanced technologies for reducing carbon emission have reached the bottleneck...
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Frequency Demodulation Analysis of Mine Reducer Vibration Signal
Issue:
Volume 3, Issue 2, June 2018
Pages:
23-28
Received:
19 May 2018
Accepted:
5 July 2018
Published:
7 August 2018
Abstract: The spectral structure complexity of the Mine Reducer vibration signal was analyzed. The basic theory of the vibration signal frequency demodulation analysis was introduced, The essential mode function which met the single component requirement was obtained by using Empirical mode decomposition in the Hilbert Huang Change. The instantaneous frequency was calculated, The spectrum of the instantaneous frequency was obtained by performing the Fast Fourier Transform, The spectrum analysis was done.
Abstract: The spectral structure complexity of the Mine Reducer vibration signal was analyzed. The basic theory of the vibration signal frequency demodulation analysis was introduced, The essential mode function which met the single component requirement was obtained by using Empirical mode decomposition in the Hilbert Huang Change. The instantaneous frequen...
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Technical Features and Research Progress of Separating Impurities in Producing Tantalum (Niobium) Oxide by Traditional Technology
Huijuan Yan,
Desheng Tang
Issue:
Volume 3, Issue 2, June 2018
Pages:
29-36
Received:
21 June 2018
Accepted:
7 July 2018
Published:
14 August 2018
Abstract: In order to meet the demand for high purity tantalum and niobium products and to adapt to the complexity of tantalum niobium ore and waste in smelting, it was necessary to prepare high pure tantalum (niobium) oxide by traditional technology. In this paper, the process features, principles and functions of the decomposition, extraction, neutralization, washing and calcination in the traditional technology were described in detail, and the key factors which affect the separation of impurities in each process and the influences of various factors on the process and product quality were analyzed. Extraction was the key process to remove metal impurities in products. The main factors affecting the extraction separation are acidity, grade efficiency, temperature, extractant, concentration of tantalum/niobium, mass ratio of tantalum to niobium and volume ratio. In the process of precipitation and calcination the reagent purity, the equipment material, and the environmental cleanliness must be concerned to avoid the inclusion of impurity elements. The research and progress of impurity removal technology in tantalum (niobium) oxide production process were reviewed. The innovation of the traditional technology can meet special low requirement of one or several elements in the product, such as fluorine, tungsten, antimony, etc. For the future the basic research on the existence state and transformation behavior of tantalum and niobium and other elements in each process of traditional technology should be strengthened.
Abstract: In order to meet the demand for high purity tantalum and niobium products and to adapt to the complexity of tantalum niobium ore and waste in smelting, it was necessary to prepare high pure tantalum (niobium) oxide by traditional technology. In this paper, the process features, principles and functions of the decomposition, extraction, neutralizati...
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Upgrading of Phosphate Ore Wastes of El-Nasr Mining Company, Egypt
Mohamed Abuel Kasem Mohamed,
Galal Abd El Azim Ibrahim,
Ahmed Mohamed Ebrahim Rizk,
Mahmoud Mohamed Ahmed,
Ahmed Mohamed El Nozahi,
Nagui Aly Abdel-khalek,
Hasan Bakheat
Issue:
Volume 3, Issue 2, June 2018
Pages:
37-46
Received:
25 July 2018
Accepted:
14 August 2018
Published:
8 October 2018
Abstract: Phosphates are vital nonrenewable resources. The treatment of phosphate ore wastes of El-Nasr Mining Company, Sepaeya, Egypt aims to upgrade P2O5 percent, adds a new economic value, development of the Egyptian national income, and aids to clean the mine district. The main aim of this paper is to compare different processing alternatives methods to concentrate and upgrade of phosphate ore tailings assayed 18.37% of El-Nasr Mining Company, Sepaeya, Egypt. The concentration of wastes not only add an economic value but also safe the human, animals, and plants. Two options of sizes obtained from grinding and sieving were separated to obtain the highest grade of P2O5 with the greatest recovery. The first option (i.e. sizes below 100 µm) gave P2O5 percent of 23.88%, P2O5 recovery of 42.37%, and weight recovery equals to 33.68%. The second option (i.e. sizes below 160 µm) gave P2O5 percent of 22.52%, P2O5 recovery of 53.25%, and weight recovery equals to 44.88%. The calcination process raised P2O5 to 22.4 with weight recovery 83.75%, and P2O5 recovery of 99.10%. Leaching process using acetic acid gave the best results at the following conditions: a)solid to liquid ratio 15% where the percent of P2O5 raised from 18% to 22.23% with weight recovery about 86%, b) Agitation time 15 minutes where the percent of P2O5 raised from 18% to 22.35% with weight recovery about 86%, c) Agitation speed 1200 rpm where the percent of P2O5 increased from 18% to 22.23% with weight recovery about 86%, d) Acid to ore ratio 16.7% where the percent of P2O5 increased from 18% to 21.44% with weight recovery about 88.7%. The leaching process on size -100 µm raised P2O5% from 23.88% to 28.44% with weight recovery 84%. The weight recovery and P2O5 recovery with respect to the original feed were 28.29% and 42.39%, respectively.
Abstract: Phosphates are vital nonrenewable resources. The treatment of phosphate ore wastes of El-Nasr Mining Company, Sepaeya, Egypt aims to upgrade P2O5 percent, adds a new economic value, development of the Egyptian national income, and aids to clean the mine district. The main aim of this paper is to compare different processing alternatives methods to ...
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