Xu Z.,China Bluestar Lehigh Engineering Corporation
Chinese Journal of Environmental Engineering | Year: 2013
Effects of glucose and sodium acetate as carbon source on nitrogen and phosphorus removal efficiency were researched for CMICAO process. The influence of water distribution with different carbon/nitrogen (C/N) ratios on the system performances was investigated. Higher nitrogen and phosphorus removal efficiency was achieved when sodium acetate was as carbon source instead of glucose. When using glucose as carbon source and COD was 200 mg/L, C/N ratio was 5 and water distribution of anoxic tank and anaerobic tank was 1:2, effluent concentrations of COD, TN, NH4 +-N and TP were 28.5, 10.8, 2.1 and 0.5 mg/L, respectively, meeting the Grade A Standard. When using glucose as carbon source, C/N ratio should be controlled between 5~7.5 and water distribution of anoxic tank and anaerobic tank can be kept at 1:1.
Yang H.,University of Science and Technology Beijing |
Hu N.L.,University of Science and Technology Beijing |
Xu Z.,China Bluestar Lehigh Engineering Corporation |
Chen L.,JCHX Mining Management Co.
Applied Mechanics and Materials | Year: 2013
This paper introduces a new technology using a new mathematics model to solve the blending problem of two or more kinds of minerals, which grades are very different even in orders of magnitude, and creates a blending system which can produce an optimal program of blending automatically using a feedback process based on Surpac, a mining software, and achieves a real time truck dispatching system finally. All of above can improve quality and quantity of the minerals blending stably, that has been proved in practice. According 2001's record, the average amplitude of Cu grade was reduced from 10.54% to 3.72% and the average amplitude of Mo grade was reduced from 6.49% to 3.11% after this system worked. © (2013) Trans Tech Publications, Switzerland.
Jie C.,China University of Mining and Technology |
Sheng-guo J.,China University of Mining and Technology |
Wen-bing X.,China University of Mining and Technology |
Xiaobao F.,China Bluestar Lehigh Engineering Corporation
Electronic Journal of Geotechnical Engineering | Year: 2014
Chamber group in 42 mining district of Peigou mine was studied with the methods of numerical simulation and field test, to acquire the characteristics and control countermeasures of stability of the chambers. Geological radar and drilling peep instrument were used to test and judge the loosen zone of chambers surrounding rock, and software UDEC was used to analyze the utilizing range of grouting and grout diffusion under different water cement ratio and injection pressure. According to the lithological characteristics of chambers, the first support scheme of u-steel support backwall grouting was put forward. The industrial result showed that chamber group was effectively maintained after adopting rational support scheme. © 2014 ejge.
Hu M.,Nanjing University |
Li J.,Nanjing University |
Zhang B.,Jiangsu Provincial Environmental Monitoring Center |
Cui Q.,China Bluestar Lehigh Engineering Corporation |
And 2 more authors.
Marine Pollution Bulletin | Year: 2014
Thirteen samples of seawater were collected from Yellow Sea and East China Sea near Qingdao, Lianyungang, and Xiamen, China. They were analyzed for halogenated organophosphorus flame retardants (OPFRs). The compounds selected for detection were Tris(2-chloroethyl) phosphate (TCEP), Tris(2-chloroisopropyl) phosphate (TCPP), Tris (1,3-dichloro-2-propyl) phosphate (TDCPP), and Tris(2,3-dibromopropyl) phosphate (TDBPP). The total concentrations ranged from 91.87 to 1392. ng/L and the mean concentrations of these four chemicals were 134.44, 84.12, 109.28, and 96.70. ng/L, respectively. TCEP exhibited the highest concentrations, although concentrations of TCPP and TDCPP were also fairly high in Lianyungang and Xiamen. Generally, Lianyungang was the most heavily polluted district, with very high concentrations of TCEP at LYG-2 (550.54. ng/L) and LYG-4 (617.92. ng/L). The main sources of halogenated OPFRs were municipal and industrial effluents of wastewater treatment plants in the nearby economic and industrial zones. © 2014 Elsevier Ltd.
Zhang P.,Florida Industrial and Phosphate Research Institute |
Zheng S.,China Bluestar Lehigh Engineering Corporation |
Sun W.,China Bluestar Lehigh Engineering Corporation |
Ma X.,China Bluestar Lehigh Engineering Corporation |
Miller J.,University of Utah
2014 SME Annual Meeting and Exhibit, SME 2014: Leadership in Uncertain Times | Year: 2014
A 1989 FIPR characterization study of the future phosphate resources in Florida showed that MgO would be a problem with both the pebble and concentrate as phosphate mining moves deeper. Since the ratio of concentrate to pebble will become higher and higher In the future, reducing Mg content in the concentrate by a small margin would allow blending of a large portion of the high-dolomite pebble. This research was conducted based on that logic. The following six approaches were tested for reducing MgO content in the flotation concentrate: (1) Adding a dolomite depressant in the rougher flotation step; (2) Dolomite flotation on the rougher concentrate with and without grinding; (3) Dolomite flotation on the cleaner concentrate with and without grinding; (4) Scrubbing the flotation feed; (5) Scrubbing the rougher concentrate; (6) Scrubbing the cleane r concentrate. Successful methods Include adding a dolomite depressant in the rougher flotation, olomite flotation on the cleaner concentrate with grinding, and scrubbing the cleaner concentrate in quartz sand. These techniques could reduce MgO content in the final concentrate by 20-40%. The flotation process could achieve a concentrate with the lowest MgO content, but it is the most expensive approach. Adding a dolomite is inexpensive and easy, but the effect is limited. Overall, scrubbing may be the most promising technology for this purpose.