Jian Li Yang

The Study of Modified Straw Carbon and Absorbing Phenol in Wastewater

The straw carbon is made by straw stalk (carbon plant corn, wheat, etc) gasified and dry distillated in 1,200°C. The experiment disscusses performance of straw carbon absorbing phenol in different conditions (time, dosage, temperature, pH value), and modified straw carbon in different conditions to improve its adsorption performance. Results show that the best conditions for straw carbon absorbing phenol is: amount ratio of phenol and straw carbon is 0.84mg/g (C phenol = 30mg/L), temperature is 35°C, pH value is 9, the best adsorption time is 5h.The optimal modified conditions is: modified with hydrogen peroxide, solid-liquid ratio is 1:1. The phenol content in simulation wastewater is only 0.47mg/L after absorbed by modified straw carbon. It is in line with GB 8978-1996 wastewater discharge standards.

Study on Coal Separability for Wangcun Inclined Shaft in Chenghe

On the basis of the coal quality characteristics, the screening and drifting tests have been carried out to investigate the separability of the coals in the inclined shaft coal samples of Chenghe Wangcun coal mine. The results showed that the mine raw coal seams are medium ash, high sulfur and medium volatile coals. The screening test results showed that the water content and sulfur content of coals samples in each grade after sieving essentially remained the row coal characteristic. Heating value increased with the decrease of particle size, but ash content decreased with the particle size. The float-and-sink tests showed that when the given clean coal ash content was 10%13% and 15% respectively, the coal samples were in the extremely difficult degree, medium separability degree and medium separability degree respectively.

Study on Analysis of Chenghe Fly Ash and Preparation of molecular sieve

In recent years, with the rapid development of coal industry, a large number of coal fly ash has been produced, while the recycling rate of the ash is rather low. It is not only a waste of the precious land resources, but also makes environment suffering severe pollution. As an important kind of new material in the national economy, the demand for molecular sieve is growing. It is possible to synthesis molecular sieve using fly ash. The way is not only energy conservation and environmental protection, but also waste reclamation, according with the theme of the sustainable development. This study is to synthesize the molecular sieve in different guide agent or addition agent conditions, which is on the basis of the analysis of chemical composition of fly ash and auxiliary guide agent and additional additives, and using inexpensive industrial waste material fly ash, which are from Cheng He mining area in Shanxi province, as basic raw material by the method of hydrothermal synthesis. It is also to find a approach for the use of fly ash with subtly. Through XRD expert zing phase, SEM observing appearance, the characterizing results show that excellent performance molecular sieve of 4A can be synthesized at conditions: calcined at 850 ℃and for 2 hours, then hydrothermal reacted with composition of reaction mixture 3Na2O:1Al2O3:2SiO2: 185H2O at temperature 90℃, crystallization time 6h with 5% guide agent or additives .

Modified Zeolite and Treatment with Cr3+ in the Wastewater

The ultra-zeolite is an important research topic at present. Using ultra-zeolite 4A to treat wastewater has the advantage that traditional methods do not have, so it has been concerned by many experts and scholars. This subject adopts microwave method to synthesize ultra-zeolite 4A. Then using the prepared ultra-zeolite 4A to adsorb Cr3+ in wastewater. Study on the effect factors such as pH value, adsorption temperature, etc. The conclusion shows that ultra-molecular sieve 4A has been successfully synthsized by microwave method. In experiment of absorption wastewater containing Cr3 + we has found when the concentration of solution containing Cr3 + is 400mg / L, pH =4, temperature is 25 and adsorption time is10 minutes, which ultra-zeolite 4A removes Cr3+ is better.

Distribution of Sulfur Forms in Low Temperature Pyrolysis of Coal

The distribution of sulfur forms in the products of low temperature pyrolysis of Carboniferous high sulfur coal from Northwest China was investigated. The typical method of Gray-King assay was used to carry out the low temperature pyrolysis experiments. GC-MS analysis was used to investigate the composition of sulfur compounds in the coal tar. The results show that sulfur mainly remained in the semi-coke and accounted for 80.97% of the total sulfur. Pyrites decomposed and transformed into sulfates and organic sulfur. 5 sulfur containing compounds were detected in the coal tar and they are dibenzothiophene, benzonaphthothiophene and their substituted homologs.

Microstructure of Magnesium-Aluminum Metal Matrix Composites Reinforced with 2wt.% SiC Particles

SiCp/Mg-Al composites with 5μm 2wt.% SiC particles as reinforcement were prepared under the protection of inorganic flux. The microstructures, textures and components of the composites were investigated using optical microscope (OM), scanning electron microscope (SEM), X-ray diffraction (XRD) and backscattered electron imaging (BSE). The results indicate that SiC particles are mainly distributed along grain boundaries, retarding grain growth and conducing to the refinement of the matrix. Interfacial reaction can occur between SiCp and Mg but not between SiCp and Al. There are α-Mg and β-Mg17Al12 phases, γ-MgAl phase, α-Al and β-Al3Mg2 phases in SiCp/Mg-Al composites with the Mg/Al ratio of 4/1, 1/1, 1/4 respectively.