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板溪锑矿废石充填采矿工艺技术研究 被引量:1
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作者 刘梦秋 郑剑洪 谷新建 《江西有色金属》 2010年第3期71-73,共3页
在分析研究板溪锑矿开采现状及存在问题的基础上,提出改进采场溜井结构、出矿方法和采场支护,选择合适的充填材料和铺垫材料,研究废石充填采矿工艺技术,有利于进一步提高板溪锑矿采场生产能力,减轻工人劳动强度,提高劳动生产率,降低矿... 在分析研究板溪锑矿开采现状及存在问题的基础上,提出改进采场溜井结构、出矿方法和采场支护,选择合适的充填材料和铺垫材料,研究废石充填采矿工艺技术,有利于进一步提高板溪锑矿采场生产能力,减轻工人劳动强度,提高劳动生产率,降低矿石贫化和损失率,降低采矿和充填成本,提高矿山经济效益. 展开更多
关键词 板溪锑 溜井结构 出矿方法 采场支护 充填材料 铺垫材料
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二步采场中深孔爆破在黄岗铁矿的应用
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作者 余冬生 《现代矿业》 CAS 2015年第4期53-55,共3页
为了提高黄岗铁矿生产能力,针对矿体赋存地质特征,采用分段凿岩阶段出矿嗣后充填采矿方法,对二步采场中深孔爆破的采准工程、切割工程及中深孔落矿等进行设计,并按设计在1 350 m中段CZ50-2#采场进行试验,爆破效果良好,块度控制较好,极... 为了提高黄岗铁矿生产能力,针对矿体赋存地质特征,采用分段凿岩阶段出矿嗣后充填采矿方法,对二步采场中深孔爆破的采准工程、切割工程及中深孔落矿等进行设计,并按设计在1 350 m中段CZ50-2#采场进行试验,爆破效果良好,块度控制较好,极大地提高了采场的生产能力,降低采矿成本,增加了矿山的经济效益。 展开更多
关键词 二步采场 中深孔爆破 复式起爆网路 分段凿岩阶段嗣后充填采方法
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Removal of phosphorus from iron ores by chemical leaching 被引量:15
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作者 金勇士 姜涛 +3 位作者 杨永斌 李骞 李光辉 郭宇峰 《Journal of Central South University of Technology》 EI 2006年第6期673-677,共5页
Alkali-leaching and acid-leaching were proposed for the dephosphorization of Changde iron ore, which contains an average of 1.12% for phosphorus content. Sodium hydroxide, sulfuriced, hydrochloric and nitric acids wer... Alkali-leaching and acid-leaching were proposed for the dephosphorization of Changde iron ore, which contains an average of 1.12% for phosphorus content. Sodium hydroxide, sulfuriced, hydrochloric and nitric acids were used for the preparation of leach solutions. The results show that phosphorus occurring as apatite phase could be removed by alkali-leaching, but those occurring in the iron phase could not. Sulfuric acid is the most effective among the three kinds of acid. 91.61% phosphorus removal was attained with 1% sulfuric acid after leaching for 20 rain at room temperature. Iron loss during acid-leaching can be negligible, which was less than 0.25%.The pH value of solution after leaching with1% sulfuric acid was about 0.86, which means acid would not be exhausted during the process and it could be recycled, and the recycle of sulfuric acid solution would make the dephosphorization process more economical. 展开更多
关键词 iron ore DEPHOSPHORIZATION acid-leaching alkali-leaching
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Empirical model for bio-extraction of copper from low grade ore using response surface methodology 被引量:2
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作者 M.YAGHOBI MOGHADDAM S.Z.SHAFAEI +5 位作者 M.NOAPARAST F.DOULATI ARDEJANI H.ABDOLLAHI M.RANJBAR M.SCHAFFIE Z.MANAFI 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2015年第12期4126-4143,共18页
The copper extraction in shaking bioreactors was modeled and optimized using response surface methodology(RSM). Influential parameters in the mesophilic bioleaching process of a low-grade copper ore including p H va... The copper extraction in shaking bioreactors was modeled and optimized using response surface methodology(RSM). Influential parameters in the mesophilic bioleaching process of a low-grade copper ore including p H value, pulp density, and initial concentration of ferrous ions were comprehensively studied. The effect of leaching time on the response(copper extraction) at the 1st, 4th, 9th, 14 th and 22 nd days of treatment was modeled and examined. The central composite design methodology(CCD) was used as the design matrix to predict the optimal level of these parameters. Then, the model equation at the 22 nd day was optimized using the quadratic programming(QP) to maximize the total copper extraction within the studied experimental range. Under the optimal condition(initial p H value of 2.0, pulp density of 1.59%, and initial concentration of ferrous ions of 0 g/L), the total copper extraction predicted by the model is 85.98% which is significantly close to that obtained from the experiment(84.57%). The results show that RSM could be useful to predict the maximum copper extraction from a low-grade ore and investigate the effects of variables on the final response. Besides, a couple of statistically significant interactions are derived between p H value and pulp density as well as p H value and initial ferrous ion concentration which are precisely interpreted. However, there is no statistically significant interaction between the initial ferrous ion concentration and the pulp density. Additionally, the response at optimal levels of p H value and pulp density is found to be independent on the level of initial ferrous concentration. 展开更多
关键词 modeling optimization bacterial leaching response surface methodology copper extraction copper ore
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Experimental Study of Preferential Solute Transportation During Dump Leaching 被引量:2
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作者 YIN Sheng-hua WU Ai-xiang 《Journal of China University of Mining and Technology》 EI 2006年第4期416-420,共5页
The production of dump leaching of the Dexing Copper Mine was affected by a preferential solution flow. Formative mechanism of the preferential solution flow was investigated by analyzing the relationship between both... The production of dump leaching of the Dexing Copper Mine was affected by a preferential solution flow. Formative mechanism of the preferential solution flow was investigated by analyzing the relationship between both dump permeability and surface tension and ore diameter. The preferential solution flow occured in the fine ore area when the application rate was low. The preferential solution flow entered into the coarse ore area because the negative pore water pressure disappeared with an increase of the application rate. The preferential solute transportation experiment was conducted by selecting NaCl as mineral. Results of the experiment showed that the concentration of the outflow solution reduced over time. The concentration of the coarse ore area outflow solution was greater than that of the fine ore area. The process of NaCl leaching can be divided into two stages. NaCl was carried out directly by diffusion--convection during the first stage, so the leaching rate increased sharply. But in the second stage, only a small amount of NaCl dissolved in the immobile water. The leaching rate increased slowly because NaC1, dissolved in the immobile water, can only be leached by diffusion. 展开更多
关键词 dump leaching preferential solution flow SOLUTE preferential transportation application rate leaching rate
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STUDY ON THE THRESHOLD GAS PRESSURE IN COAL AND GAS OUTBURST
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作者 俞启香 《Journal of China University of Mining and Technology》 1990年第1期60-65,共6页
Based on the statistical data of 26 outburst prone coal seams in China, this paper presents the relationship among the threshold gas pressure in coal and gas outburst and the volatile content and hardness of coal by m... Based on the statistical data of 26 outburst prone coal seams in China, this paper presents the relationship among the threshold gas pressure in coal and gas outburst and the volatile content and hardness of coal by mathematical statistics. The threshold value of gas pressure for outburst pmin in MPa may be calculated by formula Pmin =5(0. 1+0. 07Kf), where / is the hardness and V the volatile content (%) of a soft bed. In China, the value of Pmin of some outburst prone coal seams ranges from 0. 57 to 0. 1 MPa. 展开更多
关键词 threshold gas pressure outburst prone coal seams. volatile content
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