MOH浮选橄辉岩型钒钛磁铁矿中钛铁矿试验

采用捕收剂MOH对橄辉岩型钒钛磁铁矿中钛铁矿进行浮选试验,探索MOH、H2SO_4及水玻璃用量对钛铁矿和脉石矿物浮选分离的影响,在条件试验的基础上,进行钛铁矿浮选开路和闭路试验。结果表明,通过"一粗一扫四精"闭路流程试验,最终获得TiO_2品位为46.94%,回收率为53.87%的钛精矿。产品质量检查可知,钛精矿中Mg O含量相对较高,仅满足钛精矿五级品要求。扫描电镜结果表明,钛精矿中存在一定量橄榄石,橄榄石难以抑制导致钛精矿中Mg O含量高,进而影响钛精矿的浮选指标。     

Evaluation of hydrocarbon contaminants in olives and virgin olive oils from Tunisia

The present paper investigated on the presence of some hydrocarbon contaminants, namely polycyclic aromatic hydrocarbons (PAHs), mineral oil hydrocarbons (MOH) comprising saturated (MOSH) and aromatic (MOAH) compounds, and polyolefin oligomeric saturated hydrocarbons (POSH) in olives and extra virgin olive oils from Tunisia. Olive fruits were collected in sites exposed to different environmental contamination, and the oil extracted both by physical mean (using an Abencor extractor) and with solvent (using microwave assisted extraction, MAE). Analytical determination was performed by SPE cleanup on silica cartridge followed by spectrofluorometric detection, for PAH, and on-line HPLC-GC-FID for MOH and POSH. Oils extracted from olives by physical mean, as well as extra virgin olive oils from the market, had PAH levels never exceeding the EU legal limits. All olive samples showed similar MOSH profiles, but not clear correlation between the variable contamination levels and considered sources of contamination, was evidenced. The average MOSH content in oil extracted from olives by solvent (11.1 mg/kg) was about four time higher than in oil extracted by physical mean (2.6 mg/kg). MOSH in extra virgin oil from the market ranged from 10.3 to 38.0 mg/kg, while MOAH were not detected. The higher MOSH levels found in oils from the market evidenced an important contribution due to oil processing and/or packaging. Two of the samples were clearly contaminated with polyolefin oligomeric hydrocarbons (POSH) migrated from the plastic cap.     

Vision-based optimization of the generalized predictive active disturbance rejection controller

The batching system of the integrated mixing and spreading equipment for MOH material is a nonlinear system with large uncertainty. It is difficult for conventional control strategies to meet the requirements for system performance. This research combines generalized predictive control and active disturbance rejection technique to propose a new generalized predictive active disturbance rejection controller (GPADRC) used in the batching system of MOH material. For the nonlinearity and uncertainty of the batching system, the extended state observer in the active disturbance rejection technique is used for estimation and compensation. The batching system model is converted into an integrator form, based on which the use of generalized predictive control can greatly reduce the impact of nonlinear models and uncertainties on the controller. Aiming at the problem that the parameters of the proposed new controller are numerous and difficult to tune, the adaptive genetic algorithm is used to realize the automatic tuning of the parameters. The simulation experiment shows that the designed GPADRC can well adapt to the working conditions of the batching system and can meet the requirements for various control indicators. At the same time, the adaptive genetic algorithm can realize the rapid tuning of the controller parameters, which reduce the difficulty and time consumption of the tuning process, and improve the applicability and achievability of the designed controller.     

用新型捕收剂MOH浮选微细粒钛铁矿

用新型捕收剂MOH浮选攀枝花微细粒钛铁矿,工业试验得到含TiO247.2%、回收率76.53%的结果,与使用MOS相比,在精矿品位控制在含TiO247%时,可提高回收率6.22%。     

MOH处治桥头跳车施工技术研究

MOH是在微表处基础上的拓展性应用,该工艺采用分步填充,最后整体罩面.采用MOH材料处理桥头跳车仅需根据桥头沉陷发生的范围进行局部填充,可进行不等厚摊铺,无需铣刨原路面,对原路面没有任何损伤,减小了修补工程量,不需要大型机械,施工方便,开放交通快,工程造价低.