China Enfi Engineering Corporation

Beijing, China

China Enfi Engineering Corporation

Beijing, China
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Cheng L.,China ENFI Engineering Corporation
World of Metallurgy - ERZMETALL | Year: 2017

Since the 21st century, the nonferrous metal industry develops fast in China, with ten main nonferrous metal output exceeding 50 mill, t, equivalent to a half of the world's total. China has been growing into a big nonferrous metal producer in the world. In particular, China is both the largest producer and consumer in the world for lead and zinc. Faced with increasingly stringent environmental requirements, resources shortfall and constantly growing consumption, the lead and zinc smelting industry in China has been striving its best to develop new smelting technologies, being environ- mental-friendly, energy-efficient and resources-recycling, which is aimed at sustainable development of the lead-zinc industry and standing on the leading position in the lead- zinc smelting world on basis of innovation. The oxygen bottom-blowing lead smelting technology is the dominant process in the lead smelting industry, with over 80 % of lead output by that process. Hie SKS oxidation process replaced the outdated sintering process and liquid lead slag direct reduction smelting by bottom-blowing or side blowing replaced the blast furnace, in a environ-mental-friendly, energy-saving, efficient and cost-effective way. The SKS oxidation-liquid lead slag direct reduction process to produce lead bullion consumes standard coal less than 210 kg/t and other indicators all reaching the advancing levels in the world. As for zinc smelting process in China, hydrometallurgy is the dominant process, with zinc output more than 85 % by that process. The 152 m2 fluidized roaster can produce as high as 150,000 t/a zinc by single series with the roast- ing-Atmospheric leaching process. Equipment and technology, like the large cathode plate, automatic zinc stripping machine, automatic crane, anode straightening machine unit, whole-Automatic vertical filter press have been widely applied, with electrolytic zinc DC consumption lower than 3050 kWh/t and comprehensive energy consumption less than 900 kg standard coal per ton with the zinc electrolysis process and other indicators on the leading positions in the world. The rotary kiln, side-blowing furnace, fuming furnace and top-blowing furnace are widely used to treat leached residue, which greatly eliminates the environmental problem caused by the leached residue.


Wenlu F.,China ENFI Engineering Corporation | Changnian X.,China ENFI Engineering Corporation
12th International Conference on Mining with Backfill 2017, Minefill 2017 | Year: 2017

For the reason that Anhui Shapinggou Molybdenum mine with large-scale deep mining appears obvious underground pressure, the arch facade sequence mining and subsequent backfilling are designed for controlling the frequent underground movement. The numerical analyses of arch facade mining sequence and conventional upward horizontal slice mining sequence are carried out respectively, and static calculation and dynamic calculation are carried out for the stability of backfill. The analytical results show that the maximum principal stress distribution is uniform in the arch facade mining, and the arch facade mining has smaller degree of stress concentration and less plastic area than those of conventional sequence mining. Because of a better supporting role arising from the vaulting, the surface subsidence displacement caused by arch facade mining is smaller than that caused by conventional sequence mining. The operating range of blasting vibration influences the variation of plastic zone and displacement for backfill. When the blasting dynamic loading is applied near the backfill, the distribution area of backfill plastic zone is expanded obviously. If the curing time of backfill is insufficient, the backfill is prone to collapse. Copyright © 2017 by the Society for Mining, Metallurgy & Exploration Inc. All rights reserved.


Liao Y.,Xi'an Jiaotong University | Zhang P.,China Enfi Engineering Corporation
Mechanism and Machine Theory | Year: 2010

The precession behavior of an unbalanced rotor-bearing system with anisotropic supporting stiffness is analyzed. The result shows that the probe-orientation-related problem is still unsolved in the holospectrum technique based rotor balancing method. The deficiency of the balancing object of this method now in use, the Initial Phase Vector (IPV), sometimes makes the description or evaluation of rotor balance state unclear. Necessary modification to this method is made in this paper. A compound balancing object comprised of the magnitude of the major axis and the Initial Phase Angle (IPA) of the precession orbit is presented to replace the IPV as the rotor unbalance response. The amount and angular location of the mass unbalance can be determined precisely by the magnitude of the major axis and the IPA, respectively. Since the isotropic assumption is no longer a prerequisite and the evaluation of the mass unbalance amount is independent of the probe orientation, optimal result then can be ensured. The experiment and real application case verify its capability and feasibility. © 2009 Elsevier Ltd. All rights reserved.


Dou R.,University of Science and Technology Beijing | Wen Z.,Beijing Key Laboratory for Energy Saving and Emission Reduction of Metallurgical Industry | Zhou G.,China ENFI Engineering Corporation
Applied Thermal Engineering | Year: 2016

A 2D axisymmetric inverse heat-conduction model based on the Levenber-Marquardt method was built. The equivalent Nusselt number Nuequ of air jet impinging on a stainless steel plate with finite thickness were obtained. Radiant heat transfer is significant when the temperature of the target plate is high, which induces the nonlinear feature of the inverse heat-conduction problem. The results of the experiments and the inverse analysis provide the following findings. First, the inverse heat-conduction model is accurate. Second, Nuequ maintains a relatively small value before the onset of the air jet. After the air jet starts, however, the values of Nuequ within the stagnation zone (dimensionless radius R/Dn≤&1.0) increase dramatically, reach the peak points in the next 20s, and then remain nearly constant until the end of the experiments. Third, the radial distribution of Nu;bsubesub shows that it decreases rapidly within the region of R/D;bsubesub≤;8.0. When R/Dn exceeds 10, Nuequ appears unaffected by the Reynolds number and R/Dn. Lastly, Nuequ decreases slowly with the increase in time, which indicates that radiant heat-transfer flux decreases with target plate temperature. © 2015 Elsevier Ltd. All rights reserved.


Patent
Sichuan Chuanheng Chemical Corporation and China Enfi Engineering Corporation | Date: 2010-05-27

The present invention discloses an apparatus for thermally refining phosphorus. The apparatus comprises: a melting furnace for melting rock phosphate into melts, including a feed port and a melt outlet; and a reduction-oxidation furnace including a furnace body which gas a melt inlet, a slag outlet, and a fume outlet, and a blow gun, wherein the melt inlet and the melt outlet are in communication with each other and wherein the blow gun has an end inserted into the furnace body. The content of impurities in fumes containing phosphorus pentaoxide is low, and the phosphorus pentaoxide can be easily extracted with a high purity of the phosphorus pentaoxide and at low cost by means of the apparatus for thermally refining phosphorus according to the present invention.


Patent
Sichuan Chuanheng Chemical Corporation and China Enfi Engineering Corporation | Date: 2010-05-27

The present invention discloses a reduction-oxidation furnace for thermally refining phosphorus. The reduction-oxidation furnace comprises a furnace body and a blow gun, wherein the furnace body has a slag outlet, a fume outlet, and a melt inlet for feeding melts formed by melting rock phosphate into the furnace body and wherein the blow gun has an end inserted into the furnace body. The content of impurities in fumes containing phosphorus pentaoxide is low, the phosphorus pentaoxide can be easily extracted with a high purity of the phosphorus pentaoxide and at low cost by means of the reduction-oxidation furnace for thermally refining phosphorus according to the present invention.


Jie Y.,China ENFI Engineering Corporation
TMS Annual Meeting | Year: 2015

This paper introduces and studies systematically the Cu production of Chinese Copper smelters in recent years and in future years, as well as the technology development and CAPEX of Chinese new Copper smelters. In the paper, treatment trend on copper scraps, waste copper materials and electronic wastes are also analyzed. © Copyright 2015 by The Minerals, Metals & Materials Society. All rights reserved.


Patent
China Enfi Engineering Corporation | Date: 2016-08-10

This disclosure provides a high-temperature material conveying tank, including a tank body provided with a material cavity inside, a feed inlet at an upper part and a discharge outlet at a lower part, wherein the tank body includes a cylindrical section, a first taper section and a first connection section, the first connection section is arranged at one end of the cylindrical section and arranged between the one end of the cylindrical section and the first taper section; the first connection section is integrally formed with the first taper section, and buttwelded with the mentioned cylindrical section. The high-temperature material conveying tank of present disclosure has an advantage of good stress intensity, thereby prevents a welded joint from cracking and deforming.


Patent
China Enfi Engineering Corporation | Date: 2016-07-06

Provided are a nickel hydroxide product and its preparing method. The method includes: (a) enabling a first nickel hydroxide pulp to be in contact with sodium hydroxide, so as to obtain an alkalized pulp; (b) enabling the alkalized pulp to be in contact with a nickel sulfate solution, so as to obtain a nickel-precipitated pulp; (c) returning at least one part of the nickel-precipitated pulp to the step (a) as the first nickel hydroxide pulp, and repeating the steps (a) and (b) at least once; and (d) separating the nickel hydroxide from the rest part of the nickel-precipitated pulp.


Patent
China Enfi Engineering Corporation | Date: 2016-06-22

Provided are a method for processing a laterite-nickel ore and a method for recycling scandium. The method for recycling scandium includes steps of: extracting scandium from scandium-containing leachate with an organic extractant, so as to obtain a scandium-containing organic phase; subjecting the scandium-containing organic phase to back-extraction with a monovalent acid, so as to obtain a strip liquor; mixing the strip liquor with a precipitant, so as to obtain a scandium-containing precipitate; and calcining the candium-contained precipitant, so as to obtain scandium oxide.

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