Papers by Author: Lin Bo Li

Abstract: The separation of cobalt from zinc sulfate solutions by oxidation-precipitation process using peroxy-monosulfuric acid as oxidant has been presented according to the technological conditions of removal of cobalt from zinc electrolyte. After investigating the important parameters governing the separation of cobalt and their effect on the separation process, the optimal parameters of oxidation precipitation of cobalt were determined, the oxidation precipitation percent of cobalt was up to 90% under the conditions. The XRD analysis results of precipitates demonstrated that the precipitate was cobalt hydroxide oxide (CoOOH) in pure cobalt system while the precipitates were cobaltosic oxide (Co₃O₄) and basic zinc sulfate (ZnSO₄(OH)₆^.H₂O) in zinc-cobalt system.

Abstract: The low-cost blue coke industrial by-product, blue coke powder was used as raw material for the production of porous carbons adsorbent by steam activating at temperature of 800°C under the atmosphere of N₂ for 60 minutes. The specific surface area and pore properties of the adsorbent were characterized by using N₂ adsorption-desorption isotherms. Furthermore, the adsorption effects of the adsorbent for ammonia nitrogen in coking wastewater were investigated in terms of particle size, dosage of absorbent and adsorption time. The results show that the specific surface area is 620.94m²/g, the total pore volume is 0.4442cm³/g and the average mesopore size is 4.5808nm, the adsorbent possesses predominant mesoporous structures. In aeration, the removal rate of ammonia nitrogen can reach to 39.5% under the conditions of the ammonia nitrogen concentration of 625mg/L, the dosage of adsorbent 10g/L at the adsorption time of 60 minutes.

Abstract: The atomic oxidant was prepared under conditions of ultrasound and non-ultrasound. The influence of electrolysis time, electrolyte concentration, electrolysis voltage and additive concentration on concentration of oxidant were investigated. The results show that ultrasound could enhance the perpetrating rate. For ultrasonic cavitation and chemical effect, the concentration of oxidant significantly increased. Under the condition of electrolysis time 3 hours, voltage 6V, 35% sulfuric acid concentration and 0.5g/L additive, the ultrasonic frequency 40kHz and power 150W, the effect of oxidation could get the best result, and the oxidant concentration reached 0.9177mol/L.

Abstract: The atomic oxygen oxidant—Peroxy-monosulfuric acid was prepared by the method of electrolysis under the condition of with and without ultrasonic. The influence of electrolysis time, electrolyte concentration, electrolytic voltage and the additive concentration on the concentration of oxidant were investigated. The result indicated that with the usage of ultrasonic, combination the cavitation effect and the chemical effect enhanced the concentration of electrolysis oxidant; with the electrolytic time of 3 hours, the electrolytic tension of 6V, the sulfuric acid weight concentration of 35%, the additive concentration of 0.5g/L, the ultrasonic frequency of 40kHz and the power of 150W, the oxidant concentration could reach to 0.9177mol/L. This research is helpful for decreasing the production cost of atomic oxygen oxidant.

Abstract: This paper describes a method of removing phosphate (P) from aqueous solution by sorbent prepared with amorphous blast furnace slag (BFS) and hydrated lime. An orthogonal experiment was carried out to investigate the factors of hydration time, slurrying temperature and the weight ratio of blast furnace slag /hydrated lime and water/solid on the reactivity of the sorbent. Chemical composition of BFS was analyzed by atomic absorption spectrometry, microstructure and phase analysis of samples were conducted by SEM and XRD. It is found that all sorbents prepared show higher P adsorption capacity than single blast furnace slag.