Applied Mechanics and Materials Vols. 522-524

Abstract: This article unfolded experiments of three kinds of normal temperature collector applying to a refractory phosphorite.The results showed that CC-1(the collector self-prepared) had higher collecting capacity,selecting feature than other collectors.Meanwhile,analysis of the action mechanism of surface active agents to increase effect and dissolving in CC-1 had been made.

Abstract: Flotation experimental research is carried out on a certain sulphide copper ore of Sifangjing in Huidong, Sichuan province. The ore exist in the deeper part of ore deposit. Because of the deep burried, the oxidation rate is relatively low. The ore belongs to the typical sulfide ore. For the characteristics of the mine and the scene of the test requirements, the use of direct flotation process has achieved a successful recovery of copper. In the cleaning operation ,Strengthen copper sulfur separation to obtain qualified copper concentrate. Under the proper process conditions ,the good technical indexes were obtained.

Abstract: An experimental research to improve the grade of a magnetic concentrate from a concentrator using the cationic reverse floatation technology in the countercurrent bubble contact flotation column was conducted. The conditional tests of the pharmaceutical system and the flotation column operating parameters were done. The results show that the iron concentrate with the grade of 70.06% and iron recovery of 93.18% can be achieved according to the flow sheet o f one roughing and two scavengings under the optimal conditions. And the tailing grade is 12.08%.

Abstract: An experimental research on comprehensive recovery of associated apatite from certain iron tailings in China was carried out. The phosphorus flotation is realized at low temperature through the application of the new, more efficient AW series collector. The test results showed that the concentrate whose P₂O₅ grade was 33.50%,recovery was 92.18% was obtained for the tailings whose P₂O₅ grade was 3.05% by one roughing under the pulp temperature of 15°C, thus realizing an effective recovery of apatite from the tailings.

Abstract: At present, the good classification index has been achieved by anionic reverse flotation technology for the Anshan hematite, but the grade of the tailing is still high. The main reason is that the fine useful minerals can not be recovered effectively .According to the advantages of the packed flotation column, the reverse flotation tests of a hematite were conducted using the packed micro-bubble contacting flotation column. Based on the conditional tests of flotation column operating parameters and the pharmaceutical system, an iron concentrate with TFe grade of 67.05% was obtained and the grade of tailings was 11.25%.

Abstract: To improve the recovery of copper from refractory copper oxidized ore by sulfidization-flotation process. The result determined the optimal flotation process parameters of refractory copper oxidized ore, and the better quota selecting separately obtained by a large number of research. The copper concentrate grade reaches 10.85%, the recovery reaches 57.41%.

Abstract: The occurrence of volatile arsenic in natural gas, could lead to the poisoning of catalyst in processing equipment, and pose a serious threat to human health. In order to detect the total volatile arsenic in natural gas, this paper analyzed the characteristic and original mechanism of the volatile arsenic first, then a novel method was carried out by using silver nitrate solution, saturated potassium persulfate solution and concentrated nitric acid solution as sorption solution, followed by volatile arsenic determination with ICP-MS .The result showed that 2% silver nitrate solution had a good adsorption effect to volatile arsenic, and the recoveries of arsenic ranged from 87%~103%, which basically met the demand for the rapid detection of volatile arsenic in natural gas.

Abstract: Mature oil well temperature logging technique was applied to coalbed methane wells in order to monitor the fracture height and guide the fracturing and drainage. The results show that, after fracture treatment, fracture height was bigger than that of perforated interval, and mainly extended upward. In the case of 11^# coal seam in Taiyuan formation of Permian, Upper Palaeozoic, overlying K2 limestone were all cracked through, while in the case of 3^# and 5^# coal seam in Shanxi formation of Permian, Upper Palaeozoic, overlying sandstone section in some wells was cracked through. In the former case, the fracturing curve shows fracture pressure higher than 27MPa, pump off pressure higher than 20MPa, and high pressure dropping rate over 0.4MPa/min, while the fracture pressure lower than10MPa, pump off pressure lower than 5MPa and low pressure dropping rate that generally under 0.1MPa/min in the latter case. Fracture height is directly influenced by crustal stress of the rock cracked by fractures, and tends to become bigger with the increase of fracture pressure and pump off pressure. To achieve desired results after coalbed methane reservoir stimulation treatment, a restriction of fracture pressure during fracturing process is recommended to control fracture height.

Abstract: The efficient development of tight oil exploration and development domestic and foreign has been a difficult, hot issues, using conventional reservoir reconstruction process, the yield increase is limited. Ordos Basin in the Chang 7 layers of tight oil reserves on behalf of a large scale, widely distributed, in order to reinforce to achieve fifty million tons of Changqing Oilfield stable long-term strategic objectives of the resource base and improve the tight oil well production, faced with enormous challenges. For Changqing Oilfield tight reservoir geological features, learn from foreign experience in tight oil development success, positive change in Changqing Oilfield reservoir reconstruction,approach to volume fracturing as a concept, greatly contributed to the Chang 7 represented tight reservoir of cost effective development, the effect is significant, strategic breakthrough.

Abstract: The efficient development of low permeability reservoir exploration and development at home and abroad has been a difficult and hot issues. Changqing Oilfield is the permeability, low pressure, low abundance of the "three low" oil and gas fields, is the world famous low permeability. In recent years, with the low permeability of Changqing Oilfield fast on the scale of production, development and gradually increase the difficulty, well production decreased year by year, oil layers, layer contradictions become increasingly prominent. Changqing Oilfield how old stable production, it will be a challenging task. In this paper, Changqing Oilfield per 214 Jiyuan Chang 4 +5 reservoir, for example, focuses on the reservoir of the reservoir by strengthening fine management and implement water policies, improve water technical control, good water injection, inject enough water, improve the capacity of the reservoir stable production, improve development effectiveness.