| Vanadium is a very important strategic material,having a wide range of applications in the industry.With the continuous exploitation of vanadium ore resources,vanadium waste residue emissions are also increasing.The mineral resources are non-renewable resources,and now,the demand for resources is large.Therefore,the vanadium residue in the comprehensive recovery of valuable metal elements is of great significance.In this paper,waste vanadium residue from the production of vanadium pentoxide in Panzhihua area is used as raw material.The slag not only contains a certain amount of vanadium,but also haves rich magnesium.Aiming at the characteristics of the waste residue,the process of comprehensive recovery of vanadium and magnesium in vanadium-magnesium waste residue was proposed.The effects of sulfuric acid leaching residue,sodium hydroxide removal and preparation of light magnesium oxide were studied.The section of sulfuric acid leaching residue mainly study of acid dosage,particle size,liquid to solid ratio,reaction temperature,reaction time and other factors on the vanadium recovery rate and magnesium dissolution rate of the impact.The mechanism of the deposition process is analyzed,and the optimal deposition conditions are obtained by completing the five-factor four-level orthogonal test and the verification test.The optimum conditions for acid hydrolysis are: acid ratio is 0.9:1;particle size less than 0.074 mm accounts for 86.31%;liquid to solid ratio is 4:1;the reaction time is 60min;the reaction temperature is 50 ?.Under this condition,the recovery rate of vanadium reached 96.52% and the leaching rate of magnesium reached 94.14%.The section of hydroxide removing impurity mainly study of p H,reaction temperature,reaction time and sodium hydroxide dropping rate on the iron removal rate,manganese removal rate,calcium removal rate and the magnesium loss rate of the impact.The mechanism of the impurity removal process was analyzed,and the best impurity removal conditions were obtained by completing the four-factor three-level orthogonal test and the verification test.The optimum conditions were as follows: p H 10,reaction temperature 50 ?,reaction time 70 min,sodium hydroxide dropping rate 9ml / min.Under these conditions,the removal rate of iron was 99.87%;the removal rate of manganese was 99.76%;the removal rate of calcium was 99.65%;the loss rate of magnesium was 5.27%.The optimum process parameters for preparing light magnesia are as follows: reaction time of precipitating magnesium is 60 min;reaction temperature of precipitating magnesium is 75 ?;sodium carbonate excess coefficient is 1.2.The optimum process parameters for the calcination of light magnesium carbonate into light magnesium oxide are: calcination temperature is about 850 ?,calcination time is 120 min,heating rate is 6 ?/ min. |
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