A mixed mineral of tin, sulfur and arsenic was studied in this paper. The main components of the mineral were separated and the physical parameters of each mineral were measured. Comprehensive recovery of tin, sulfur ...A mixed mineral of tin, sulfur and arsenic was studied in this paper. The main components of the mineral were separated and the physical parameters of each mineral were measured. Comprehensive recovery of tin, sulfur and arsenic from the mixed mineral was studied. A joint flowsheet of flotation and gravity was developed according to the mineralogical characteristics of the sample. Flotation was carried out first to produce sulfur concentrate while the tailing was processed by a second flotation to obtain rougher arsenic concentrate which was further processed by gravity separation to get arsenic concentrate and the tailing of gravity separation was processed to obtain tin concentrate.展开更多
We conducted two-stage acidification-bioleaching experiments to probe the feasibility of bioleaching for a kind of mixed alkaline copper oxide and sulphide mineral. We used the uniform design method for data analysis ...We conducted two-stage acidification-bioleaching experiments to probe the feasibility of bioleaching for a kind of mixed alkaline copper oxide and sulphide mineral. We used the uniform design method for data analysis and experimental optimization, with initial pH value, pulp density, inoculation of bacteria and ferrous iron concentration selected as the influential factors. Polynomial regression shows that the four factors sequentially influence the copper recovery by 14.430%, 8.555%, 1.982% and 3.895%. Acid equilibrium in the bioleaching system is mainly influenced by alkaline gangue content, chemical reactions and bacterial activity. A maximal portion of refractory copper extracted reaches 71.08%. The dynamic analysis of copper recovery indicates that bioleaching goes through a lag leaching phase, prime leaching phase and leaching stationary phase corresponding to the growth phases of bacteria. Compared with the predicted value of 80.87%, the confirmatory experiment observes a 78.21% copper recovery under the optimal conditions of pH of 1.5, pulp density of 5%, bacteria inoculation of 30% and initial ferrous iron concentration of 9 g L-1. Results suggest that bioleaching is technically feasible to improving total copper recovery.展开更多
Objective] The aim was to explain the accumulation characteristic of mineral elements in alpine grassland plants and the effect of supplementary supply on the nutrient changes of mineral elements. [Method] Potted Poa ...Objective] The aim was to explain the accumulation characteristic of mineral elements in alpine grassland plants and the effect of supplementary supply on the nutrient changes of mineral elements. [Method] Potted Poa crymophila cv. Qinghai plants were regularly applied with liquid mineral mixed fertilizers, and samples were collected for analysis and detection. [Result] After the regular spraying of liquid mineral mixed fertilizers, the mineral elements in potted P. crymophila and its soil reduced （ P 〈0.05）, but the accumulation of corresponding mineral elements of P. crymophila in the control group was increased due to the ＂Starvation Effect＂, which was one of the endogenetic forces driving the increase in the accumulation of mineral elements. [Conclusion] This study is of great significance for the study of the accumulation of mineral elements in degraded grassland plants and its dynamic mechanism, as well as testing the hypothesis of the Starvation Effect of mineral elements. In addition, it also provides scientific bases and technical support for the restoration and remediation of degraded grassland and the development of ecological livestock husbandry.展开更多
文摘A mixed mineral of tin, sulfur and arsenic was studied in this paper. The main components of the mineral were separated and the physical parameters of each mineral were measured. Comprehensive recovery of tin, sulfur and arsenic from the mixed mineral was studied. A joint flowsheet of flotation and gravity was developed according to the mineralogical characteristics of the sample. Flotation was carried out first to produce sulfur concentrate while the tailing was processed by a second flotation to obtain rougher arsenic concentrate which was further processed by gravity separation to get arsenic concentrate and the tailing of gravity separation was processed to obtain tin concentrate.
基金Funded by the National Natural Science Foundation of China (No. 50934002)New Century Excellent Talents (No. NECT-07-0070)Yunnan Provincial Programs for Science and Technology Innovation (No. 2007AD001)
文摘We conducted two-stage acidification-bioleaching experiments to probe the feasibility of bioleaching for a kind of mixed alkaline copper oxide and sulphide mineral. We used the uniform design method for data analysis and experimental optimization, with initial pH value, pulp density, inoculation of bacteria and ferrous iron concentration selected as the influential factors. Polynomial regression shows that the four factors sequentially influence the copper recovery by 14.430%, 8.555%, 1.982% and 3.895%. Acid equilibrium in the bioleaching system is mainly influenced by alkaline gangue content, chemical reactions and bacterial activity. A maximal portion of refractory copper extracted reaches 71.08%. The dynamic analysis of copper recovery indicates that bioleaching goes through a lag leaching phase, prime leaching phase and leaching stationary phase corresponding to the growth phases of bacteria. Compared with the predicted value of 80.87%, the confirmatory experiment observes a 78.21% copper recovery under the optimal conditions of pH of 1.5, pulp density of 5%, bacteria inoculation of 30% and initial ferrous iron concentration of 9 g L-1. Results suggest that bioleaching is technically feasible to improving total copper recovery.
基金Supported by the General Program of Natural Science Foundation of Qinghai Province(2016-ZJ-906)
文摘Objective] The aim was to explain the accumulation characteristic of mineral elements in alpine grassland plants and the effect of supplementary supply on the nutrient changes of mineral elements. [Method] Potted Poa crymophila cv. Qinghai plants were regularly applied with liquid mineral mixed fertilizers, and samples were collected for analysis and detection. [Result] After the regular spraying of liquid mineral mixed fertilizers, the mineral elements in potted P. crymophila and its soil reduced （ P 〈0.05）, but the accumulation of corresponding mineral elements of P. crymophila in the control group was increased due to the ＂Starvation Effect＂, which was one of the endogenetic forces driving the increase in the accumulation of mineral elements. [Conclusion] This study is of great significance for the study of the accumulation of mineral elements in degraded grassland plants and its dynamic mechanism, as well as testing the hypothesis of the Starvation Effect of mineral elements. In addition, it also provides scientific bases and technical support for the restoration and remediation of degraded grassland and the development of ecological livestock husbandry.
