The fine slime collected from the flotation overflow in a titanium concentrator located at Panzhihua-Xichang region, with fineness of－0.025 mm 78.10% and TiO₂ grade of 8.33%, was taken as the raw material for study. Based on the characteristics of this slime, a pre-enrichment process was adopted for impurity removal in an experiment, and CC, a new type of dispersant with good selectivity, was used in the following flotation. An ilmenite concentrate was obtained grading 47.97% TiO₂ at 73.09% recovery, indicating the titanium resources in the slime can be reclaimed.

In view of the data of ground-based SAR presenting high oscillation and high fluctuation with less obvious characteristic trend, an approach for early warning and prediction of slope deformation by using velocity reciprocity was proposed, which adopts a data processing method of subtracting dislocations and deleting limits to optimize the quality of deformation data, thus the accuracy of early warning and timely prediction of landslide can be improved. The application of this approach in an iron mine in Inner Mongolia shows that not only those problems faced in the actual actuation can be solved, but also the data about disaster approaching can present obvious deformation rule. It is concluded that this early warming and prediction approach has a wide application.

Based on the theory of metal oxidation and the mechanism of diffusion rate control, a kinetic model was established for high temperature oxidation of Cr-Fe alloy plate. The effects of composition, temperature, atmosphere, partial pressure of oxygen on the oxidation behavior of the alloy were studied. The results show that the established oxidation kinetic model can quantitatively present an oxidation process of Cr-Fe alloy plate, by which the calculated results are in good agreement with the experimental results. The oxidation characteristic time (t_Φ) of the Cr-Fe alloy is about (3-4) × 10^-14 s, and t_Φ in argon atmosphere decreases gradually with the increase of Fe content in the alloy. Partial pressure oxygen doesn' t bring significant impact to the oxidation rate of alloy, and all products from the equilibrium oxidation of alloy in argon atmosphere are Cr₂O₃. According to the standard of oxidation resistance of superalloy, Cr-Fe alloy in air atmosphere can meet the rating standards for oxidation resistance and secondary oxidation resistance.

Response surface methodology (RSM) was used to optimize the flocculation settlement parameters of fine iron tailings slurry. According to the Box-Behnken test method in Design-Expert 8.0 software, a three-factor and three-level test was designed to obtain a regression equation of turbidity model for flocculation settlement of fine-grained iron tailings slurry. The results show that with the following favorable flocculation settlement parameters, including addition of inorganic flocculant FeCl₃ at an amount of 113.44 mg/L, organic flocculant PAM at an amount of 0.61 mg/L and stirring speed of 440.57 r/min, the slurry turbidity is predicted to be 11.45NTU, while the measured value is 12.38NTU, indicating that the model has a good accuracy with a small error. Based on the model variance analysis, reliability analysis and factor interaction analysis, it can be verified that RSM is reasonable and feasible to be used for optimizing the flocculation settlement parameters of fine iron tailings slurry, which can provide theoretical basis for its efficient treatment.

A flowsheet consisting of pre-reduction magnetic roasting and magnetic separation was introduced to process a refractory weakly-magnetic iron ore from Jiangsu Province. The results show that after 60 min roasting at 750 ℃ by adding coal as a reducing agent at an amount of 3%, the pre-reduced iron ore was ground to a fineness of 75% -0.074 mm and then subjected to low intensity magnetic separation consisting of one roughing, one cleaning and one scavenging, resulting in a high quality iron concentrate grading 65.05% Fe at 96.19% recovery. The research results can provide technical reference for the mineral processing of refractory weakly-magnetic iron ore.

The problems of oxidation and corrosion of LIBs copper foil in its production and application have restricted its service life and battery safety. Based on the research status of anti-oxidation technologies for LIBs copper foil in recent years, the mechanism of different passivation methods is summarized. After an introduction of the corrosion mechanism of copper foil fluid in Li-ion battery electrolyte, the research progress in improving corrosion resistance by modification of copper foil surface is reviewed. On this basis, the prospects of chromium-free passivation technology and surface modification technologies for copper foil are presented. At last, a clean, eco-friendly and efficient anti-oxidation and anti-corrosion concept is proposed.

A lead-zinc deposit is rich in valuable metals of gold and silver. In order to improve the economic benefits of products, the associated gold and silver should be enriched in lead concentrate to the maximum extent. Based on the actual situation in the production, the distribution of associated gold and silver in the products after mineral processing was ascertained, and then optimization tests were perform. The results showed that most of the associated gold and silver were concentrated in the lead concentrate, and the recovery of gold and silver was positively correlated with the recovery of lead. Without altering the original reagent regime for lead flotation, ethyl xanthate was introduced as an auxiliary collector in a close-circuit test adopting a flowsheet consisting of one stage of roughing, two stages of cleaning and two stages of scavenging. And the obtained lead concentrate with grade around 50% can have a high enrichment of gold and silver and a low content of zinc. It is concluded that gold and silver resources can be comprehensively recovered, which can bring in the maximized economic benefit.

As for a cobalt-containing raffinate in Africa, several neutralizing agents, including limestone, lime, limestone-lime, as well as a combination of flotation tailings and lime, were separately used for impurity removal in the study, and a preliminary economic evaluation was also conducted. It is found that a combination of flotation tailings and lime is a good choice for impurity removal by neutralization, which can not only save the usage of limestone, but also recover part of the copper and cobalt in flotation tailings. Using this process, the leaching rates of copper and cobalt from flotation tailings can reach 81.69% and 41.10%, respectively. After an addition of lime, the precipitation rates of copper and cobalt can reach 95.43% and 13.64% respectively, and the iron removal rate is up to 99.86%.

Limonite-type and serpentine-type nickel laterite ores were taken for experiment. A coupled process for extracting nickel and cobalt was adopted, consisting of chloridizing leaching with HCl as the initial leaching medium for limonite-type nickel laterite ore, and selective hydrolysis for serpentine-type nickel laterite ore. The leaching rates of Ni, Co, and Fe from limonite-type laterite ore were 99.6%, 100%, and 96.9% respectively, under the conditions including acid-to-ore ratio of 5∶4, liquid-to-solid ratio of 4∶1, reaction temperature of 100 ℃, and reaction time of 30 min. After that, the obtained lixivium of limonite-type nickel laterite ore, being mixed with concentrated HCl in a volume ratio of 1∶4, was used to leach serpentine-type nickel laterite at 150 ℃ for 90 min with a liquid-to-solid ratio of 1∶1, resulting in the leaching rates of Ni and Co up to 84.9% and 100%.

With sodium oxalate and D401 chelating resin as impurity removal materials, impurities of calcium and magnesium in crude lithium solution were removed by adopting a process consisting of chemical precipitation and ion exchange. In an experiment, reaction was firstly run at 25 ℃ for 60 min by adding sodium oxalate at an amount of 17.6 times the theoretical value, with pH of 6.5 and stirring rate of 300 r/min. And then, the lithium solution after filtration flowed through a resin column at a rate of 8 BV/h. As a result, the removal rates of calcium and magnesium reached 98.21% and 83.36%, respectively, and the lithium loss rate was 5.34%. The purified lithium solution was then recrystallized and purified, and the obtained lithium phosphate powder, with regular morphology and uniform dispersion, has its purity higher than 99.5%.