Coal and gas are two important resources in China,and it is an effective way to recycle them with the method of co-extraction of coal and gas.In view of actual situation of China's co-extraction of coal and gas,th...Coal and gas are two important resources in China,and it is an effective way to recycle them with the method of co-extraction of coal and gas.In view of actual situation of China's co-extraction of coal and gas,this research adopts the science evaluation of gas extraction of coal by the method of quantitative evaluation,and preliminarily establishes the technical evaluation system of co-extraction of coal and gas.Technical evaluation system of co-extraction of coal and gas includes safety evaluation,economic evaluation and resource recovery evaluation in the process of mining coal and gas.In addition,this paper results in the selected evaluation parameters and target functions that are used in the three evaluation methods.The establishment of evaluation system for co-extraction of coal and gas plays an important theoretical significance and guiding role in co-extraction of coal and gas for China's coal enterprises.展开更多
In order to find the best method of the phosphorus recovery, some kinds of the phosphorus recovery methods were applied using the same raw material. The acid treatment shows the highest recovery performance, on the co...In order to find the best method of the phosphorus recovery, some kinds of the phosphorus recovery methods were applied using the same raw material. The acid treatment shows the highest recovery performance, on the contrary, the alkali treatment indicates the lowest recovery rate. The recovery rate was improved by the application of the heat treatment or hydrothermal method. In the acid treatment, the recovered phosphorus is mainly composed of aluminum phosphate, conversely, in alkali treatment, recovered phosphorus was mainly composed of sodium phosphate containing a small amount of aluminum. But the aluminum content in the phosphorus decreased by introduction of the heat treatment or hydrothermal method.展开更多
This paper introduced two processes continuous reflux extraction and a continual reflux extraction of diosgenin. Making acomparison between the two methods, we found that the relation beteen the residue(Wn) of diosgen...This paper introduced two processes continuous reflux extraction and a continual reflux extraction of diosgenin. Making acomparison between the two methods, we found that the relation beteen the residue(Wn) of diosgenin in materials and time(n) canbe described for the continual reflux extractive process by the folllowing equation: Wu=WO’ A’ and the residue(Wt) of diosgenin inmaterials and time(t) can be described for the process by the following equation: Wt=A.(A. B+B)t-1 W0 It shows the recovery rateof the continual reflux extraction is better. The result of extraction indicated that the continual reflux extractive method enhancedrecovery Fate,and saved the time of extraction also.展开更多
基金supported by the State Key Basic Research Program of China(No.2011CB201206)the Major Projectof the National Science and Technology of China(No.2011ZX05040-005)the National Natural Science Foundation of Youth Science Foundation(No.50904033)
文摘Coal and gas are two important resources in China,and it is an effective way to recycle them with the method of co-extraction of coal and gas.In view of actual situation of China's co-extraction of coal and gas,this research adopts the science evaluation of gas extraction of coal by the method of quantitative evaluation,and preliminarily establishes the technical evaluation system of co-extraction of coal and gas.Technical evaluation system of co-extraction of coal and gas includes safety evaluation,economic evaluation and resource recovery evaluation in the process of mining coal and gas.In addition,this paper results in the selected evaluation parameters and target functions that are used in the three evaluation methods.The establishment of evaluation system for co-extraction of coal and gas plays an important theoretical significance and guiding role in co-extraction of coal and gas for China's coal enterprises.
基金The authors wish to express their appreciation to Dr. Eric Bray (Professor of Yokkaichi University) for his advice on making the article. The authors also express their appreciation to the Hinaga Wastewater Treatment Center (Yokkaichi City Government, Waterworks and Sewage Bureau) offering us the ash.
文摘In order to find the best method of the phosphorus recovery, some kinds of the phosphorus recovery methods were applied using the same raw material. The acid treatment shows the highest recovery performance, on the contrary, the alkali treatment indicates the lowest recovery rate. The recovery rate was improved by the application of the heat treatment or hydrothermal method. In the acid treatment, the recovered phosphorus is mainly composed of aluminum phosphate, conversely, in alkali treatment, recovered phosphorus was mainly composed of sodium phosphate containing a small amount of aluminum. But the aluminum content in the phosphorus decreased by introduction of the heat treatment or hydrothermal method.
文摘This paper introduced two processes continuous reflux extraction and a continual reflux extraction of diosgenin. Making acomparison between the two methods, we found that the relation beteen the residue(Wn) of diosgenin in materials and time(n) canbe described for the continual reflux extractive process by the folllowing equation: Wu=WO’ A’ and the residue(Wt) of diosgenin inmaterials and time(t) can be described for the process by the following equation: Wt=A.(A. B+B)t-1 W0 It shows the recovery rateof the continual reflux extraction is better. The result of extraction indicated that the continual reflux extractive method enhancedrecovery Fate,and saved the time of extraction also.
