-
Design and Experimentation Shaking Table Tool for Gravity Concentration Metal Mineral Separation
Issue:
Volume 7, Issue 1, March 2022
Pages:
1-7
Received:
23 December 2021
Accepted:
12 January 2022
Published:
20 January 2022
Abstract: Mineral dressing, especially metal minerals in Indonesia, is carried out using appropriate methods based on their properties and characteristics. The method often used is gravity concentration. The technology that makes use of it is a shaking table. This tool works based on the difference in specific gravity and pаrtіcle size in the flowing film concentration which exerts a thrust against the pаrtіcles on the deck. In an effort to meet the needs of practicum and research in the mining engineering department, especially the Sriwijaya University Mineral Processing Laboratory. For this reason, the existing equipment in the laboratory is modified by changing the design and size of its main components. The deck is designed with a length of 170 cm and a width of 102 cm. The riffles are installed parallel to a height of 3 mm, a width of 1 cm and a spacing of 3 cm. Experimentation is carried out by adjusting the variation of the variables. The variables used as parameters are deck slope (4°, 6° and 8°), water flow rate (10, 12 and 15 L / min) and feedingspeed (5, 10 and 15 minutes). The sample used was refined tin ore. Sampling at two locations, namely sample A at the Bantam B122 Collection Station, Belinyu and sample B at the TKT DU1521 Jangkang Washing Plant Station.
Abstract: Mineral dressing, especially metal minerals in Indonesia, is carried out using appropriate methods based on their properties and characteristics. The method often used is gravity concentration. The technology that makes use of it is a shaking table. This tool works based on the difference in specific gravity and pаrtіcle size in the flowing film co...
Show More
-
Effect of MgO/Al2O3 on Fluidity of SFCA-Based Binder Phase
Yinhe Lin,
Xiangkui Cheng,
Xuefeng Shi,
Chunlei Pu,
Ye Tian,
Guoliang Yin,
Hao Yu,
Jian Zhao
Issue:
Volume 7, Issue 1, March 2022
Pages:
8-13
Received:
23 December 2021
Accepted:
24 January 2022
Published:
9 February 2022
Abstract: The fluidity of sinter binder phase is one of the main properties that determine the quality of sinter, and it is also an important index to characterize the quality of sinter. So far, iron and steel enterprises mainly produce high alkalinity sinter, and its binder phase is mainly composite calcium ferrite based binder phase. Therefore, the research object of this paper is the composite calcium ferrite based binder phase of high alkalinity sinter. The effect of MgO/Al2O3 on the fluidity of high calcium composite calcium ferrite based binder phase was investigated from three aspects: fluidity index, liquid phase formation temperature and melting time by using chemical pure reagent and melting point velocimeter. The results show that in the range of MgO/Al2O3 from 0.46 to 0.68, with the increase of the ratio of MgO to Al2O3, the fluidity index first increases and then decreases, and the maximum value is obtained at MgO/Al2O3=0.65; The melting time decreases first and then increases. At the same time, the minimum value is obtained at MgO/Al2O3=0.65, and the influence on the melting time becomes more and more obvious with the increase of MgO/Al2O3 ratio; the characteristic temperature of liquid phase formation increases briefly and then decreases.
Abstract: The fluidity of sinter binder phase is one of the main properties that determine the quality of sinter, and it is also an important index to characterize the quality of sinter. So far, iron and steel enterprises mainly produce high alkalinity sinter, and its binder phase is mainly composite calcium ferrite based binder phase. Therefore, the researc...
Show More
-
Experimental Compressive Strength and Microstructure Analysis of Magnesium Fluxed Pellets
Zeyu Chen,
Changqing Hu,
Xuefeng Shi,
Qichen Hu,
Lianji Liu,
Hong Xiao
Issue:
Volume 7, Issue 1, March 2022
Pages:
14-25
Received:
12 January 2022
Accepted:
26 January 2022
Published:
9 February 2022
Abstract: In this paper, Zhong Guan iron ore is used as raw material. By adjusting the content of lime, raw magnesium powder and bentonite, the effect law of different SiO2, MgO content and alkalinity on the compressive strength of pellet ore under low silicon conditions was studied, And the pellet strength change law was systematically analyzed from the microscopic morphology and structure perspective. The results of the study show that increasing the roasting temperature and alkalinity can effectively improve the compressive strength of pellets. At low SiO2 content, the pellet ore is mainly cemented by hematite continuous crystals and the change in strength is not obvious. With the increase of alkalinity, the amount of liquid phase of low silicon flux pellets increases during roasting, and the liquid phase of calcium ferrite system with strength higher than hematite eutectic appears, which improves the pellet strength; With the increase of MgO mass fraction, magnesium ferrite increases, which not only inhibits the formation of liquid phase in pellets, but also inhibits the oxidation of magnetite. Because the strength of magnesium ferrite system is greater than that of magnetite and hematite, the pellet strength increases, but too much magnesium ferrite will also affect the liquid phase bonding inside the pellet, lead to structural deterioration and reduce the pellet strength. Therefore, the compressive strength of pellet increases first and then decreases. The above study provides theoretical guidance and reference for the investigation of low-silica magnesia fluxed pellets.
Abstract: In this paper, Zhong Guan iron ore is used as raw material. By adjusting the content of lime, raw magnesium powder and bentonite, the effect law of different SiO2, MgO content and alkalinity on the compressive strength of pellet ore under low silicon conditions was studied, And the pellet strength change law was systematically analyzed from the mic...
Show More
-
Determination Method of Gas Content in Limestone and Its Application
Issue:
Volume 7, Issue 1, March 2022
Pages:
26-30
Received:
16 February 2022
Accepted:
28 February 2022
Published:
9 March 2022
Abstract: The determination of gas content in coal and rock mass is the basic work to predict the gas emission of working face and mine. Generally speaking, gas exists in coal body in adsorbed state and free state, and the amount of adsorbed gas accounts for a large proportion. In order to explore the gas occurrence of lime rock mass, isothermal adsorption experiments are carried out on K2 and K3 limestone in Yangquan mining area. The experiments show that the gas adsorption capacity of lime rock mass is very small and mainly exists in the rock mass as free gas. When the temperature is constant, the gas content of limestone rock mass is linearly related to gas pressure and pore volume. That is, gas pressure and pore volume are the main factors determining the gas content of lime rock mass. Based on the gas state equation, this paper studies and determines the indirect calculation method of gas content in lime rock mass. The indirect calculation method is used to predict the gas emission of z15104 working face in Sijiazhuang coal mine. The prediction accuracy is about 86%, and a good prediction accuracy is obtained. It has certain guiding significance for mines with similar geological conditions.
Abstract: The determination of gas content in coal and rock mass is the basic work to predict the gas emission of working face and mine. Generally speaking, gas exists in coal body in adsorbed state and free state, and the amount of adsorbed gas accounts for a large proportion. In order to explore the gas occurrence of lime rock mass, isothermal adsorption e...
Show More
-
Design and Development of a 0.012 m3 Froth Flotation Machine from Locally Sourced Materials
Francis Asokogene Oluwadayo,
Okafor Michael,
Oboh Anthony
Issue:
Volume 7, Issue 1, March 2022
Pages:
31-35
Received:
2 March 2022
Accepted:
21 March 2022
Published:
31 March 2022
Abstract: The desire to design and develop machine with high versatile method of physically separating mineral particles based on differences in the ability of air bubbles to selectively adhere to specific mineral surfaces in mineral/water slurry using indigenous materials is constantly evolving to meet specific requirements of specific industrial plant. Therefore, the aim of this study was to design and construct a 0.012 m3 capacity laboratory froth flotation machine using locally sourced materials with the view to promoting indigenous technology in Nigeria. The construction was based on parameters established from literatures. The design was done using Auto-Cad version 7 software. The machine was built of different components which are corrosion resistant, easy to access and can be assembled and disassembled when the need arises. The machine was constructed such that its height can be adjusted to suite flotation characteristics of different materials. The machine was of height 1.5 m and designed to operate at batch condition. A flotation tank of capacity 0.012 m3 holds the pulverized pulp mixture for flotation operation. The flotation tank was equipped with regulated speed agitator shaft and stirrer assembly to condition the pulverized pulp mixture. Regulated air flow from a 0.02 m3/min compressor was also applied to the mixture in the cell for effective hydrophobicity and hydrophilicity.
Abstract: The desire to design and develop machine with high versatile method of physically separating mineral particles based on differences in the ability of air bubbles to selectively adhere to specific mineral surfaces in mineral/water slurry using indigenous materials is constantly evolving to meet specific requirements of specific industrial plant. The...
Show More
