Papers by Author: Dian Wen Liu

Abstract: Properties of the ore were studied by chemical analysis, X-ray diffraction analysis and optical microscopy analysis. Research results show that the ore contains 479.5 g/t of silver and 0.54% of copper. Silver minerals are mainly argentite, copper minerals are mainly chalcopyrite and digenite, and gangue minerals are mainly quartz and dolomite. Based on the properties of the ore, flotation feasibility study was conducted. Results show that concentrate with excellent test indexes that a Ag grade of 4787.31 g/t with a Ag recovery of 87.97% and a Cu grade of 6.01% with a Cu recovery of 87.92% were obtained under the used process and reagent system conditions.

Abstract: The effects of refractory zinc oxide ore which came from Lanping of Yunnan Province were studied using agitation leach method in laboratory in order to find out the optimum leaching conditions. The optimum conditions obtained are as follows: ammonia concentration 3mol/L, ammonium bicarbonate 1.5mol/L, granularity (-0.074mm) about 85%, solid to liquid ratio 4:1, and leaching time 2h. On this condition, the test obtained the better index of the zinc leaching rate 74.4%.

Abstract: The balling properties of pyrite cinder (PyC) with high content of copper are researched in this paper. The results indicate that grinding process is an effective way to improve the quality of green balls. Through the measuring of drop strength compressive strength and cracking temperature on pyrite cinder balls, it is found that the best bailing properties of PyC can be obtained under the recommended parameters (the content of grain size of PyC below 75 μm accounts to 95.75% and bentonite dosage is a mass ratio of 2%) and green balls with 5.4 frequency•(0.5m)-1 of drop strength, 15.8 N•each-1 of compressive strength and cracking temperature of about 700 °C are obtained, which can meet the requirements of metallurgical technology.

Abstract: A craft of concentrated acid-heating reinforced leaching process is investigated for the treatment of a high arsenic pyrite cinder, a common by-product in vitriol industry. The pyrite cinder, containing 57.37% Fe, and 2.78% As, was conducted for the acid leaching process. The results demonstrated that iron concentrate with 60.57% Fe, 0.28% As and 96.23% of iron recovery was obtained under the optimal acid leaching conditions(Sulphuric acid concentration is a mass ratio of 20%, a leaching temperature of 60°C, a liquid-solid ratio of 2:1 and a leaching time of 120 min).This craft can be used to utilize pyrite cinder and produce qualified concentrate as iron-bearing feed for steel industry, which will help to solve the pollution of sulfuric acid residue and extend raw material sourcing for Chinese steel industry.

Abstract: The composition construction and characteristics of MCGS configuration software of industry control are introduced，the process of configuration with MCGS and main functions of the system is also described in details through the project study on grinding and classification system in mineral processing plant．Plant experiences show that the system has the advantages of high stability, high automation，convenient operating，and the system has widely the value of application and promotion．

Abstract: Zinc oxide ore from Lanping contained large amount of fine slime which badly deteriorated flotation performance, and it complexly intergrowed with plenty of alkaline gangues with calcium and magnesium. In order to investigate the impact of pre-desliming on flotation, experiments of direct flotation and pre-desliming flotation were carried out in the work. Finally, a zinc recovery of 88.73% with a Zn grade of 13.93% was obtained in direct flotation test, and a higher zinc recovery of 95.25% with a Zn grade of 13.56% was achieved by pre-desliming flotation. Pre-desliming flotation test was superior to direct flotation test, because of an increase of nearly 7% in zinc recovery under the condition of similar Zn grade. At the same time, dosage of sulfurization agent used in pre-desliming flotation was lower by 46.67% than that in direct flotation, which obviously improved the availability of sulfurization agent. So both product index and economic benefit were enhanced after pre-desliming.

Abstract: Flocculation and sedimentation of fine bauxite from flotation tailing pulp were studied using different flocculants to investigate the possibility of its application. The results of this investigation indicate that inorganic flocculants of PAC and PAS have better flocculating effect than organic flocculants of PAM1# and PAM2# when keeping the original pH (7.5~8.0) of tailing pulp, however its consumption are large. It was found that the pH of pulp is important to the tailings settlement. The dosage of flocculants are greatly reduced and the velocity of floc settling is accelerated when the pH of tailing pulp is adjusted to 6.5~7.0 using sulfuric acid. PAM1# and PAM2# are effective flocculants for fine bauxite from the tailings pulp and improved the sedimentation performance compared with PAC and PAS at pH 6.5~7.0. It was also found that the flocculants can be used in combination to treat original bauxite tailing, and good sedimentation effect has been achieved, but the dosage of reagents is bigger when the organic flocculant is combined with inorganic flocculant.

Abstract: Pulp pH value plays a significant role in the froth flotation. Especially in the flotation of fluorite, the performance of flotation will be affected greatly by pulp pH. MO, a new kind of modified fatty acid was used as collector, and H2SO4 and Na2CO3 were used to regulate pulp pH in the experiment. The mechanism of influence of pulp pH on flotation of fluorite and calcite was investigated by such parameters as fluorite recovery, zeta potentials and the infrared spectroscopy about minerals at different pulp pH values. As is shown in the results, the point of zero charge(PZC) of fluorite is pH=9.5 and the PZC of calcite is pH=8.5. The optimum pulp pH of the flotation of fluorite and calcite is determined as 9.5~10 and 8~9 respectively. pH value should be controlled above 9 to depress calcite. Finally, 9.5~10 was determined as the optimum pH to float the fluorite from the calcium-containing fluorite ores.

Abstract: In this paper a new technology for comprehensive utilization of arsenic in high-arsenic copper sulfide concentrate has been studied out. Firstly,the concentrate was bioleached by moderate thermophile Sulfobacillus thermosulfidooxidans, under the suitable leaching conditions, the experiments results show that the concentrate is bioleached 82% of Cu,78% of As and 40% of Fe. Secondly, removal of Fe3+ by solvent extraction with P204 from bacterial leaching solution are presented, and Fe3+ is extracted up to 93％, and the content of Fe3+ in raffinate is under 9 mg/L. The comprehensive utilizations of most of arsenic from leaching liquor after removal Fe3+ has been carried out. When the temperature is 80 to 90°C, pH at 4.0~5.0 and ammonia as a neutralizer, the results of XRD analysis show that the forming process of copper arsenate is complicated, and the formed molecular formulas are in different types, and they are CuAs2O4, Cu5As2O10•5H2O, C4H6As6Cu4O16, Cu5As4O15•9H2O and Cu2AsO4OH•3H2O. The comprehensive utilizations of most of arsenic are in the form of copper arsenate, and the content of arsenic is 9.11~35.82mg/L in solution after its precipitated. This study provides a new treatments and process for the utilization of arsenic in the high-arsenic copper sulfide concentrate.

Abstract: The test had been carried out on a lead oxide ore (18.57% Pb) from Kazakhstan, which had a high oxidation ratio (above 95%) and complexly intergrowed with plenty of alkaline gangue minerals such as calcite and dolomite. A joint flowsheet that combined the gravity separation with flotation was developed to recover the lead, during which flowsheet, a new effective slurry regulator was used. Compared with the joint flowsheet, the concentrates of the single gravity separation and the single flotation were achieved with a lower Pb recovery of 53.80% and 56.06%, and the Pb grade of 62.00% and 66.28%, respectively. Finally, a concentrate by the joint flowsheet was obtained with a Pb recovery of 89.12% and a Pb grade of 58.90%. The tailing from the joint flowsheet had a low Pb grade of 1.59%, with a loss of 5.50% of Pb. The experimental results show that the joint flowsheet was better than the single flowsheet for this lead oxide ore, which greatly improves both the performance and economic benefit for the concentrator.