Zhou J.-S.,Guizhou Kailin Group Co. |
Chen W.-X.,Guizhou Research Institute of Chemical Industry |
Tang B.,Guizhou Research Institute of Chemical Industry
Xiandai Huagong/Modern Chemical Industry | Year: 2012
To solve silica gel blocking problems in the fluorine absorption system of wet phosphoric acid plant, ammonium fluoride is introduced into the fluorine absorption system. The results show that, the addition of ammonium fluoride solution can effectively dissolve the silica gel, thus ensure the quality of absorption solution in the circulation system, which makes the fluorine absorption system run well.
Zhang C.-X.,Central South University |
Li X.-B.,Central South University |
Dong L.-J.,Central South University |
Yao J.-R.,Guizhou Kailin Group Co.
Dongbei Daxue Xuebao/Journal of Northeastern University | Year: 2016
A sensor layout evaluation model based on the technique for order preference by similarity to ideal solution (TOPSIS) was established to make up the layout deficiencies of empirical design. First, the indices which had great impacts on the choice of sensor-layout programs were selected according to the technical conditions, economic conditions and engineering conditions to build evaluation index system. Second, considering the influence of the indices at the edge state on the weight, the variable weight calculation method was used to get the index weights of all schemes. Finally, comprehensive advantages and disadvantages of each scheme were calculated by TOPSIS. This method was used to evaluate microseismic monitoring sensor layout programs to obtain the good and bad of each program. This model provides a good way for the layout of microseismic monitoring sensors. © 2016, Editorial Department of Journal of Northeastern University. All right reserved.
Li X.,Central South University |
Yao J.,Central South University |
Yao J.,Guizhou Kailin Group Co. |
Du K.,Central South University
Yanshilixue Yu Gongcheng Xuebao/Chinese Journal of Rock Mechanics and Engineering | Year: 2013
Various test results show that hard rock in high geostress tends to be broken more easily, which provides us a good opportunity to investigate non-explosive mining when unloaded. The characteristics of stored energy in hard rock metal mines under high geostress are described. Consequently, the possibility of the continuous mining methods in deep metal mines is analyzed. At present, there are two mandatory conditions to realize non-explosive mining in deep metal mines. One is the high-performance equipments, and the other one is the site-specific geographical conditions, such as well developed rock discontinuities. After unloaded in excavation, the strength of rock mass is weakened by the redistribution of high geostress, which is helpful for seepage of groundwater and thus the number of unstable blocks increases. These conditions provide the advantages for non-explosive continuous mining. In this paper, a geological survey of deep phosphate deposit in Kaiyang phosphate mine is carried out. The rock classification of deep phosphate deposit in this project is put forward according to rock mass classification system(CSIR). Non-explosive mining test for the deep phosphate deposit ore is implemented in Kaiyang phosphate mine. The results of geological survey and non-explosive mining test demonstrate the feasibility of hard rock cracking in high geostress region. The excavation damaged zone(EDZ) of roadway is tested and its scale is larger than the range of the blasting-disturbed zone. The rock mass in EDZ could be efficiently cut by a low power road header. It is easier to cut rock mass in the excavation damaged zone than full-face excavation. It shows that non-explosive mining can be employed in high geostress hard rock for its effectiveness in mining-induced fracture.
Xiang S.-L.,Guizhou Kailin Group Co. |
Wu Y.-L.,Guizhou Kailin Group Co. |
Liao J.-X.,Guizhou Kailin Group Co.
Xiandai Huagong/Modern Chemical Industry | Year: 2015
Ammonia is used as absorbent to absorb the fluorinated compound in tail gas from wet-process phosphoric acid production by countercurrent washing technology and forced filtration technology of fluosilicic slurry through the second fluorine scrubber, the first fluorine scrubber and Venturi scrubber. The results indicate that the fluoride concentration in tail gas and centrifugal filtrate of the first fluorine scrubber are 6.31 mg·m-3 and 11.33%, respectively, under the following conditions: 7.5 of pH of second fluorine scrubbing solution, 45℃ of temperature, 35 minutes of residence time, 6.5 m3/(m2·h) of spray density and 4.0 m/s of the superficial gas relocity. The direct economic benefit from the integrated production of anhydrous hydrogen fluoride and silica can reach 11.0276 million RMB Yuan/a. ©, 2015, China National Chemical Information Center. All right reserved.