Advanced Materials Research Vols. 634-638

Abstract: The gangue mineral surface inevitably enriches some copper ions, nickel ions and other metal ions when copper-nickel sulfide ore is ground and in the flotation process. These ions can activate the gangue minerals so as to influence the selective separation of valuable minerals and gangue minerals. This paper, based on the ore property, found that complexing agent LXA could make nickel grade increase to 7.88% from 6.32%, but the recovery rate reduced by 15.61%; complexing agent LXH1 could make nickel grade and recovery rate increase by 0.6% and 1.3% respectively by comparing the flotation effect in the presence of complexing agent EDTA, LXH1, sodium thiosulfate and LXA respectively.

Abstract: Arsenic pollution in nonferrous metallurgy industry and its control and utility techniques were summarized. The arsenic emission from the process of metallurgy industrial production, which is main sources of Arsenic pollution, is harmful to environment. The treating methods and the present utilization of As-containing soil, slag and tailings, dust and As-contaminated wastewater are introduced in this paper. And also the development and application and future development of Arsenic products are indicated. Furthermore, it points out promising directions for the treatment of As -containing materials. With the development of nonferrous metallurgy industry, new technology should be developed to reduce the production of harmful substance and the consumption of energy. Besides, we should learn excellent production experience from other countries, and try to make use of the secondary resources.

Abstract: The continuous leaching conditions was simulated by means of laboratory equipments based on industrial production, some single factor tests were performed to investigate the effects of soaking time, the number of washing, washing liquid to solid ratio and temperature of the continuous leaching on the soluble vanadium (SV) content of residue. The results show that the SV content residues could reduce to 0.17% after optimization of process parameters in comparison with industrial production, furthermore the results have good stability and repeatability.

Abstract: A new extractant HBL@101 was used to directly extract vanadium from high acid leach solution of stone coal. The effects of acidity and Eh of feed, time, phase ratio and temperature on the extraction of vanadium were investigated. The extraction distribution isotherm was also obtained. The results showed that the extraction of vanadium reached 98% in single stage with A/O ratio of 1:1 at 35~45 °C for 10 min. More than 99.7% of vanadium can be extracted in three-stage counter current extraction. The loaded organic can be easily stripped using NaOH solution. After pH adjustment, the strip liquor was used to precipitate vanadium by adding NH4Cl. The final product of V2O5 with purity of 98.7% can be obtained.

Abstract: A new mineral processing and metallurgy technology was proposed, which was that the ferro-nickel concentrate was prepared from laterite ore by coal-based direct reduction. Under the reduction of cheap reductant and the catalysis of composite additives, the effects of coal-based direct reduction were enhanced and the ferro-nickel was extracted. The optimal conditions were followed that the alkalinity was 0.87, and the roasting temperature was 1150°C, and the roasting time is 2.5 hours. The recovery rate of nickel was 86.7% and the nickel content of ferro-nickel concentrate was 5.3%.

Abstract: Physical properties of the charge, such as viscosity, basicity and melting temperature, are key factors for the reduction smelting of laterite ore. In this study, CaO is used to improve the properties of the ore. The effect of CaO on the properties before and after smleting is studied and the dosage of CaO is optimized. The results show that the properties of the smelted ore after the addition of CaO are improved as follows: the basicity of 0.55, the density of 2.86 g/cm3, the melting temperature of 1320 oC, the viscosity of 0.82 Pa•s (at 1500 oC), the specific conductivity of 0.64 Ω-1•cm-1 (at 1500 oC). The results also show that 99.87% of nickel is recovered and nickel in the alloy is concentrated to 14.82% while nickel in the slag is as lower as 0.004%.

Abstract: The end point control for converter steelmaking is important operation in converter smelting later stage, and the end point control level directly affects the production efficiency and product quality. From the point of view of auxiliary resources operating characteristics, we analyzed the steelmaking end point control process, established the terminal forecast model based on DRNN type neural network, and established terminal optimization control model using improved particle swarm optimization algorithm to solve, and finally drew converter terminal optimization control strategy. Through the simulation, the optimal results show that: When the end forecast error (ω[△C]＜±0.03%), hit rate is 93.1%, and with (ω[△T]＜±12°C), hit rate is 94%, supplementary blowing oxygen time is 2.3 min, and materials resources saving 15%. For promoting the work of energy saving and emission reduction of Converter steelmaking process, it has important practical significance.

Abstract: In this research, a refractory iron ore is processed, according to the basic facts of mineralogical study. Mineralogy shows that the ore is characterized by the finely disseminated iron minerals with a small amount in the ore. Iron minerals in the ore are mainly hematite and magnetite. On the basis of the ore characteristic, a flowsheet of "stage grinding-low intensity magnetic separation-high intensity magnetic separation-gravity concentration by fine shaking table" was developed. An iron concentrate assaying 51.45% Fe at a recovery of 62.12% was obtained when the raw ore contains 18.61% Fe.

Abstract: The stability state of slope rock mass is relating to each other’s relative location during the transformation from open-pit to underground mining, it’s the most disadvantageous influence on the slope stability when the underground mining area is located in the toe of slope, and it’s the best influence as in the slope extracellular region. Slope stability factor changes with the geometric dimensions of underground mining increased, but not in direct proportion. Under the condition of constant geometric dimensions of mining area, the influence on slope stability is changing with the mining depth increased. Thus indicating that the influence on slope stability by underground mining has its spatial property, and to determine the specific influence value requires a combination of many factors, such as the relationship of relative spatial position, the geometric dimensions of mining area, engineering geological conditions and so on.

Abstract: In order to solve technical problems which restricted coal mining operation, such as low penetrability of coal mass and low efficiency of gas extraction, according to geological mining condition of Yuyang Mine, Crossing Borehole Hydraulic Fracturing system was designed and investigated in N3704 west gas tunnel (below). The system was based on coal or rock mass hydraulic fracturing theory and gas flow theory. Through the experimental study of fracture and analysis of fracturing effect after inspection, the result of field test shows that Crossing Borehole Hydraulic Fracturing system could improve the gas extraction efficiency significantly. The test result provides a basis for hydraulic fracturing operation in other mines.