Table of Content

15 February 2011, Volume 27 Issue 2

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Research Progress of Pretreatment Technology for As， S-bearing Gold Ore Concentrate at Home and Abroad

YIN Wan-Zhong, HONG Zheng-Xiu, MA Ying-Qiang, LI Qiang

2011, 27(2):  1-8. 

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Pretreatment technology of As and S bearing gold ore is still an important area of concern, for improving the recovery of gold, reducing costs, meeting environmental requirements and designing the best process have a great significance. The recent As and S bearing gold ore pretreatment situation at home and abroad is outlined, and research achievements on roasting of arsenic, sulfur and gold, wet chemical treatment, pressure oxidation and bacterial oxidation are described respectively. Also future direction of development is proposed.

Technique Alteration and Evolvement of the Dressing Flow of Sijiaying Iron Mine

ZHENG Wei-Min, WANG Yu-Chun

2011, 27(2):  9-15,25. 

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Introduced some technology alteration since the commissioning of sijiaying iron mine at 2010-10. Oxide ores system: newly built the plant and added flotation equipments, dilatancy and alteration of filtration equipment, promoted field strength of low magnetic equipment before middle and high intensity magnetic dressing, added high intensity magnetic equipment, gravity separation adding scavenging and gravity separation concentrate controlling screening,the third stage grinding "two to one" alteration, purification of cycle water, alteration of sedimentation pond, optimization of flotation reagent and so on. Primary ore system: return position of magnetic separation column tailings,adding recycle system of tailings and sewage reservoir, altering plumbing system,and realizing zero discarding of industrial waste water.the dressing technique level ,quality and output of concentrate were promoted, and got better social and economic benefits. Meanwhile, put forward the direction of decreasing tailing grade, and improving metal recovery of oxide ore dressing system, improving the feeding ore grade by primary election before grinding of primary ores to get the goal of increasing output and decreasing discarding.

Design and Construction of Earth and Rock Blasting under Complicated Environment

CAI Ze-Jun, CHEN Zhong-Chao

2011, 27(2):  16-18. 

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According to the requirement of the real estate construction projects in Guangning Yujingyuan, the place must trimmed to the required level. The controlled blasting adopted for site preparation. The total rock volume of blasting is 11 000 m3. The demolition plan, the blasting parameters of the main explosive hole and blasting network, blasting equipment and a series of safeguard measures are detailed. There have no accidents in the whole construction process. And the surrounding construction have not damaged.

Research Of Pillaring Recovery Design Based On DIMINE Software

LI Ning, WANG Li-Guan, XIAO Ying-Cai, ZHU Ming-Hai, WANG Chao

2011, 27(2):  19-21,36. 

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Combined with the specific example of Tandan copper mine, summarize pillaring methods and application conditions, through the ground pressure monitoring, selecting a reasonable structural parameters of the stope, utilizing the effective roof support technology, and create all the three dimensional visualization model entities of mine project by DIMINE, and on this basis, make pillar visualization recycling design, the results have played a guiding role for the mine actual production.

Study on Coupling Supprot Technology of Anchor-Mesh-Cable and Bottom-Anchor under High Stress

YANG Liang

2011, 27(2):  22-25. 

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Using numerical simulation technology, coupling support mechanism of anchor-mesh-cable and bottom-anchor has been analyzed. According to actual engineering of a coal mine, the reasonable coupling support structure of anchor-mesh-cable and bottom-anchor under high stress has been analyzed. It is proposed roadway damage is twist deformation under high stress. Using the reasonable coupling support structure and parameter of anchor-mesh-cable and bottom-anchor can control and get good supporting effect.

Current Situation and Prospect of Mineral Processing Technologies of Wolframite Slime

LU Jun

2011, 27(2):  26-29,32. 

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Introduced the current situation of mineral processing technologies of wolframite slime, such as improved centrifugal separation process, flotation process and its reagents, high gradient high intensity magnetic process and combining process of mineral processing and metallurgy. And their applications were envisaged.

Design and Application of LCG Dry Separator

ZHAO Gang

2011, 27(2):  30-32. 

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Introduces the structural characteristics and magnetic properties of LCG dry separator, and discusses the design of LCG Dry machine. LCG Dry machine is used to make tailing discarding and pre-concentration on ultra-poor magnetite with good effect and successfully applied in many plants. Especially for pre-concentration of low-grade magnetite in dryland, it has a broad application prospect.

Study on Numerical Simulation of Ventilation and Temperature Drop in Heading Face Based on Fluent

ZHAO Cheng-Long, CHEN Xi-Shan

2011, 27(2):  33-36. 

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Based on the characteristic of heading face and the theory of restrained wall-attached jet ventilation in confined space, the mathematical model of pressed ventilation and temperature drop in heading face is set up. Using the Fluent simulate and analyze the distribution of the inlet airflow and temperature field under different airflow speed in roadway. The result shows that inlet airflow with 5m/s speed and 25 ℃ can reach the comfortable work environment.

Study on Oxygen Enhancing Ventilation in Blind Drift at Plateau Mine by Numerical Simulation

HE Lei

2011, 27(2):  37-40. 

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On the basis of the oxygen lack circumstance of plateau of 4 200 m, the related parameters of oxygen enhancing ventilation desigen of blind drift are calculated. The process of oxygen enhancing ventilation at the condition of 30%~50% concertration of supling oxygen is simulated, and the amount of oxygen and the concentration is analyzed. The result provides data for the plan of enhancing oxygen ventilation in blind drift at plateau mine.

Study and Assessment of the Variability in Fertility of Reclaimed Soil in Zhangji Mine

LI Wei, CHEN Long-Qian, ZHOU Tian-Jian

2011, 27(2):  41-43. 

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Coal mining leads to land subsidence and arable land damage. Land reclamation is an important measure for arable land restoration. To study and assess the variability in fertility of reclaimed soil is of great significance to direct the reclamation and reutilization of mining subsided land. The variability of fertility of reclamation soil in Zhangji coal mining area located at Huainan city were studied. The results showed that: the contents of organic matter, total nitrogen, Olsen-phosphorus and available K increased with the extension of time，while the soil fertility reduced with the depth of reclamation soil increasing. Took the soil fertility level of normal arable land as assessment standards, the fertility restoration index of reclamation soil indicated an upward trend with time extending.

Micro-examination of Copper Droplet Electro-capillary Migration in the Copper Smelting Slag

LI Chang-Rong, JIANG Ming-Li

2011, 27(2):  44-46. 

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The slag of copper smelting is a kind of important secondary metal resource. The slag phase investigation about the electro-capillary migration of metal droplet in the copper smelting slag was carried out. The results show that the process of copper droplets migration and accumulation in the slag is not obvious without electric field, and they are randomly distributed in the slag. But that process will be increased in the presence of external electric field. The quantity and size of copper droplet is larger at cathode than at anode, and the copper would be concentrated in a particular area of cathode. The radius of copper droplet in the slag will increase with the time increase of holding temperature, they finally presented round shape.

Three Types Convergences of the Comparative Analysis Based on FLAC^3D Strength Reduction Method

WANG Shao-Hua, ZHAO Zong-Yong, GUO Jing, YANG Jin-Qiang

2011, 27(2):  47-48,64. 

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FLAC^3D was used to analyzed a simple slope,the convergence criterion, displacement mutation criterion and plastic zone criterion which were now commonly used to seek safety factor separately. the calculate results of the three criterias were similar,what,s more ,they were close to the tranditional answer of safety factor which was solved by built-in language.It was illustrated that the plastic zone would be more conservative as the criterion of the safety factor， but by monitoring the displacement of key points was relatively straightforward precision. In order to maximize the accuracy, we should take the  other criterias  into account and at the same time based on the above criterias in the future specific using. This would get more reliable results.

Construction Project Investment out of Control and Prevention Measures

ZHANG Guo-Qiang, XU Zhi-Hong, BAI Wei-Xian

2011, 27(2):  49-50. 

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Construction investment control measures to prevent construction projects become an important topic of investment control. From the design、construction and management of construction projects three aspects of investment out of control and prevention measures.