Pure beryllium shows low plasticity and brittleness during plastic deformation,greatly increasing the difficulty of its plastic processing.The influence of preparation process on the rolling performance and effect of beryllium ingot was studied by rolling and tensile tests.The results show that the beryllium ingot sintered and formed with target powder are more likely to be plastically deformed than airflow powder,and has better rolling performance and effect.After the target beryllum powder is sintered at a certain temperature range,the internal microstructure of the prepared beryllium ingot is refined by dynamic recrystallization,and the grain size becomes more uniform;the recrystallization degree of the beryllium ingot during the molding process inclines to be complete with the increase of the time within a specific time period,and the average particle size is refined to some extent with the increase of time.In addition,the rolling performance of the prepared beryllium ingot is improved,which can guarantee the smooth progress of subsequent rolling and the comprehensive quality of the prepared beryllium plate.In order to improve the rolling performance and effect of the beryllium ingot,it is preferable that the target powder should be used to prepare the beryllium ingot and sintered at T+200℃~T+300℃,with the molding time being controlled within t+4 h~t+6 h.

Using ammonium metavanadate as V raw material and tetrabutyl phthalate as Ti raw material,micron-sized flower ball V₂O₅@TiO₂composites in network shape were prepared by hydrothermal reaction and calcination at 350℃.The electrochemical performance of V₂O₅@TiO₂composites as anode materials for lithium-ion batteries was tested.The results show that under the condition of constant current chargedischarge current density of 100 mA/g,the specific discharge capacity of particulate V₂O₅is 270 mA·h/g with a capacity retention rate of 50.2%after 300 cycles,while the specific discharge capacity of V₂O₅@TiO₂composites is as high as 619.9 mA·h/g with the capacity retention rate of 160.7%under the same test conditions.The ability of V₂O₅@TiO₂composites to maintain a high specific discharge capacity during long-term cycling is mainly attributed to the coating of TiO₂that acts as a protective layer,which inhibits the dissolution of V₂O₅in the electrolyte and reduces the stress of Li+insertion/extraction,slowing down the degradation of the V₂O₅structure.The results of this study provide a simple and effective method for the preparation and surface modification of V₂O₅as anode materials for lithium-ion batteries.

Retired ternary lithium battery materials were leached with sulfuric acid.The influences werestudied of sulfuric acid dosage,stirring rate,reductant dosage,leaching liquid-solid ratio,leaching time,leaching temperature,and leaching potential on the leaching of Ni,Co,Mn and Li,and the optimized leachingtechnical parameters were determined.The results show that under the optimized conditions of sulfuricacid dosage of 110%the theoretical amount,stirring rate of 250 r/min,reductant dosage of 70%the material,liquid-solid ratio of 5:1,leaching time of 4 h,leaching temperature of 85 ℃,and leaching potential of250 mV,the leaching rates of Ni,Co,Mn and Li are higher than 99%.The research on the process providesa scientific basis for the comprehensive utilization of retired ternary lithium battery materials.

又到春暖花开时,气温上升,天气明媚,旅游成了人们休闲消遣的首选方式。各类国外自由行与国内随心游的爆火体现出人们对异地风景的追求与喜爱。然而,近期多发的旅游宰客及诈骗事件值得引起公众注意,外出旅游时需保护好个人财产;某些国人出境旅游时。

The L₂₅(5⁶)orthogonal test was used to study the effects of sulfuric acid concentration,liquid-solid ratio,leaching temperature,stirring speed,reaction time and tungsten slag particle size on the tungsten leaching rate in the sulfuric acid leaching process of alkali-decomposed tungsten slag,and the experimental results were analyzed.The results show that the significant factors affecting the tungsten leaching rate are in the descending order of leaching temperature,sulfuric acid concentration,tungsten slag particle size,liquid-solid ratio,stirring speed and reaction time.The optimum conditions for tungsten leaching are leaching temperature 40℃,sulfuric acid concentration 20%,tungsten slag particle size 75~150μm,liquid-solid ratio 20∶1,stirring speed 250 r/min and reaction time 1.5 h.Under the optimum conditions,the tungsten leaching rate can reach 91.63%.This study can provide a reference for optimizing the sulfuric acid leaching process of alkali-decomposed tungsten slag.

The content of Sc2O3in the tailings of Bijigou vanadium-titanium magnetite in Yang County,Shaanxi Province is 97.08 g/t.In order to fully recover the rare earth resources,scandium was leached by direct acid leaching,and the effects of acid type and dosage,aid-leaching agent type and dosage,leaching temperature,leaching liquid-solid ratio,leaching time,and feed fineness on the leaching rate of scandium were systematically studied.The results show that without the addition of aid-leaching agent,the leaching effects of H2SO4,HCl,H2SO4+HF,and HCl+HF on scandium in tailings are very poor,but the leaching rate by HCl is higher than that by H2SO4.Adding 2^#aid-leaching agent in HCl system can significantly increase the leaching rate of scandium.When the tailings are ground to a fineness of-0.075 mm paticles accounting for 80%,the leaching rate of scandium can reach 89.53%under the optimal conditions of 2^#aid-leaching agent dosage of 15%,HCl concentration of 6 mol/L,liquid-solid ratio of 3∶1,leaching temperature of 90℃,and leaching time of 6 h.The direct acid leaching process has a high leaching rate of scandium and is more operatable,which can promote the development of recovering scandium from tailings.

As a rare earth metal,scandium has been widely used in many industries.Recycling scandium from scandium-containing wastes can not only solve the problem of environmental pollution by waste,but also alleviate the serious shortage of scandium supply in China.In this paper,the research progress of scandium recovery from various scandium-containing wastes(red mud,titanium dioxide waste acid,tungsten slag,fly ash)is reviewed,and the development of scandium recovery technology in China is prospected.It is pointed out that high efficiency,low cost and environmental protection are the development direction of the scandium recovery industry.

Vanadium in the precipitated mother liquor from the hydrolytic precipitation process was reco-vered by ion exchange,and the effects of resin type,feed solution pH,temperature and adsorption time on vanadium adsorption were investigated.The kinetics and isothermal adsorption model of vanadium adsorption by D314 resin were studied.The column dynamic adsorption and desorption tests of vanadium were carried out,and the qualified desorption solution was used to dissolve red vanadium.The results show that under the conditions of pH 2.4,temperature 45℃and adsorption time 40 h,the saturated adsorption capacity of D314 resin for V₂O₅is 243 mg/mL.With 5%NaOH+10%NaCl as a desorption agent,the V₂O₅concentration at the peak of desorption solution reaches 67.5 g/L with an enrichment ratio of 23.6 times.The adsorption behavior of vanadium on D314 resin conforms to the pseudo-first-order adsorption kinetic equation,and the isothermal adsorption process conforms to the Langmuir model.The recovery of vana-dium from the precipitated mother liquor by ion exchange shows an adsorption rate of over 95.5%and a desorption rate of over 98.2%.The qualified desorption solution can be used to dissolve red vanadium.The technology is feasible and the process is simple,providing a technical way for vanadium recovery.