Synergistic Effect Evaluation of Slot-Type Nozzle Area, Jet Pressure and Jet Distance on Improving Deashing Performance of Flat CARTRIDGE Filter

The difference of deashing performance between the areas of positive-to-blowing holes and that of non-positive-to-blowing holes is an important problem that causes a non-uniform deashing performance to a flat box filter cartridge, which limits the improvement of raising the ash cleaning efficiency to this kind of filter. In order to solve the above problems, the influence of blowing pressure, blowing distance and blowing hole area on cleaning performance was studied. Industrial coating test was also carried out to investigate and verify the actual ash cleaning performance under the optimal conditions obtained from the above investigations. Finally, the design method of the size of the slotted blowing hole was optimized. The results showed that at 0.3 MPa of the pulse pressure, the cleaning performance can meet the cleaning requirements and the best cleaning uniformity can be obtained. With the increase in slot-type nozzle area, the pressure at the areas facing the non-positive nozzles increased significantly, and thus the overall cleaning uniformity increased. The slot-type nozzle area of 273, 546 and 819 mm2 had the best cleaning effects at the jet distances of 40, 20~40 and 20 mm, respectively. The findings of this study are of great significance and can provide theoretical and experimental reference for important parameters selection of the flat cartridges filter in industrial application to improve the efficiency of dust removal

An Efficient Ash Cleaning Method for Flat Box Cartridge Filter: Structure, Parameters and Cleaning Mechanism of Slotted Blowing

The problem of serious ash accumulation at the lower part of flat box filter cartridges is an important limitation for the improvement of ash cleaning efficiency in this kind of filter. To solve the above-mentioned problem, the type of slotted blowing hole impacting the performance of the ash removing under the same ash cleaning area was studied. In the present work, a total of four types of slotted blowing holes with different length were designed. The influence of blowing distance and blowing pressure on dust removal performance were investigated. Numerical simulation was conducted to demonstrate the mechanism of the dust removal process. An industrial coating test was also carried out to investigate and verify the actual ash cleaning performance under the optimal conditions as obtained from the above investigations. The results showed that: (1) the performance of dust cleaning produced by a three-slit blowhole was better than that by a four-slit blowhole; (2) 0.2 MPa was determined to be the optimal blowing pressure, which meets the requirement of ash cleaning; (3) 20 mm was selected as the optimal blowing distance, as this was the distance at which the surface side wall pressure at the non-positive-to-blow hole area was obviously increased, indicating that the whole performance of ash cleaning could be improved. The results obtained in this study are of great significance for improving the efficiency of dust removal in the use of flat box filters, promoting the development of dust removal technology, protection of environment, and reduction of human health damage

The value of serum tumor marker CA125 and CEA in the diagonosis of non-small cell lung cancer

Background and Objective Tumor marker cancer antigen 125(CA125) and carcinoembryonic antigen (CEA) all are the tumor markers found early. It was reported that the positive rate of CEA was highly in adenocarcinoma, after being analyzed all the case reports of non-small cell lung cancer (NSCLC) in recent 3 years, it was found that positive rate of CA125 was much higher in NSCLC than that of literatures. So, it's necessary to evaluate the value of serum CA125 and CEA measurement for NSCLC. Methods The level of CA125 and CEA were detected with chemiluminescence in 136 NSCLC patients,42 patients with respiratory diseases and 50 cases of normal control. Results The levels of serum CA125 in NSCLC patients were significantly higher than that of patients with respiratory diseases and normal control (except mixed cell lung cancer) (PP<0.0001). The levels of serum CEA in adenocarcinoma and squamous patients were significantly higher than that of patients with respiratory diseases and normal control (P<0.0001). No difference between patients with respiratory diseases and normal control. The positive rates of CA125 were 92.3% in large-cell lung cancers, 80.2% in adenocarcinoma, 54.8% in squamous cancer, 50% in mixed cell lung cancer, respectively. The positive rates of CEA were 67.4% in large-cell lung cancers, 25.8% in squamous cancer, 0 in adenocarcinoma and mixed cell lung cancer, respectively. Combined measurement of CA125and CEA positive rates was higher only in adenocarcinoma. The positive rates of CA125 and CEA were 86.9% and 63.6% in advanced NSCLC, respectively. The positive rates of CA125 were 90.9% in advanced adenocarcinoma.Conclusion The positive rates of CA125 is higher than that of CEA in NSCLC patients, especially in large-cell lung cancers and advanced adenocarcinoma. CA125 is more useful than CEA in diagnosis of NSCLC

A semi-scaled experiment for metals separating and recovering from waste printed circuit boards by slurry electrolysis

Waste printed circuit boards (WPCBs) are considered as the most complicated and valuable component among e-waste. Slurry electrolysis can separate and recover metals from the extremely complex WPCBs. To promote its industrial application, a 5000 mL scale experiment was conducted to confirm industrial feasibility. Those results showed that copper and total metal recovery rates were 94.5 % and 75.2 % under the optimized conditions (30 g/L WPCBs, 10 g/L CuSO4 center dot H2O, 30 g/L NaCl, 190 g/L H2SO4, 30 g/L H2O2, 298 K temperature, 250 r/min stirring speed, 300 A/m(2) and 8 h). The copper purity was 92.9 %, and SEM-EDS analyses indicated the main dendritic metals recovered were copper and lead. USEtox toxicity potential evaluation results demonstrated human toxicity and ecotoxicity of WPCBs sharply decreased after treatment. A cost analysis of this process indicated that the $1.0 cost was partially offset by the$ 1.9 return from 1 kg WPCBs. Thus, slurry electrolysis has a promising industrial future for e-waste recycling/utilization. (C) 2020 Institution of Chemical Engineers. Published by Elsevier B.V. All rights reserved.</p

Recovery of high purity copper from waste printed circuit boards of mobile phones by slurry electrolysis with ammonia-ammonium system

Waste printed circuit boards (WPCBs) are identified to be the most complex recycling materials among waste electrical and electronic equipment (WEEE). Slurry electrolysis with acidic system can directly separate and recover copper from WPCBs while current efficiency and purity were generally reduced due to deposition of impurity metals and the hydrogen evolution during recovery process. In ammonia-based system, copper can be selectively extracted and copper (II) ammine complexes generally react with metallic copper to form copper (I) ammine complexes, promoting current efficiency and purity. Therefore, an efficient ammonia-ammonium carbonate slurry electrolysis system is proposed for high purity copper recycling from waste printed circuit boards of mobile phones (WPCB-MPs). The factors affecting copper current efficiency and recovery rate are systematically discussed. These results indicate that appropriate increasing NH3 center dot H2O, (NH4)2CO3, Cu2+, NaCl concentration, solid-to-liquid ratio, current density and reaction time could effectively increase copper recovery rate and current efficiency. The current efficiency and recovery rate of copper are 95.2 and 90.4%, respectively under the optimum test conditions of 20 g/L Cu2+, 0.25 mol/L (NH4)2CO3, 4 mol/L NH3 center dot H2O, 30 g/L solid-to-liquid ratio, 1 mol/L NaCl, 20 mA/cm2, 3 h. Moreover, copper could be recovered at the cathode with a purity of 99.97%. Compared with acidic system, this study provides an efficient approach to recover high purity copper from WPCB-MPs, showing a prospective future for WEEE resource recycling