Study On The Experimentalof Beryllium Ore Leaching And Recovery Process

High costs for leaching refractory beryllium ore, energy consumption technical difficulties,On the basis of the existing sulfuric acid leaching of the beryllium ore, This paper presents the first ore mixed with sulfuric acid while at a certain temperature processing, replacing the previous sulfuric acid method after the first ore calcination and then a certain concentration of sulfuric acid leaching methods, reducing energy consumption and cost savings. For beryllium hydroxide in the problem of high sulfate, proposed a new method for the removal of sulfate- sodium hydroxide hydrolysis, making the removal of sulfate reached the indicator. In this paper, experimental study carried out in the following aspects.1、Study on the Leaching Method of Beryllium OreA new method for beryllium ore leaching was proposed, and the conventional method of sulfuric acid leaching was changed. The problem of high calcination temperature was solved, and the temperature was decreased from 1400℃~1500℃ to 200℃. In the proposed leaching process, the effects of temperature, time, ratio and other conditions on beryllium oxide ore leaching rate was analyzed. As a results, the leaching rate of beryllium oxide ore reached to 95%. The best technical parameters for beryllium ore leaching was acquired, and the energy consumption, cost savings was reduced.2、Improvement on the Leaching Method of Beryllium OreThe use of sulfuric acid to leach beryllium ore, under pretreatment temperature with 280 ℃, beryllium leaching rate reached 98.20%. Compared to the original processing temperature at 1400 ~ 1500 ℃, lower energy consumption was saved 80%. In the proposed leaching process, the effects of, sulfuric acid consumption, pretreatment temperature, liquid/solid ratio on the beryllium leaching rate were analyzed. The optimal operation parameters for beryllium ore leaching was acquired, and which will provide a valuable reference for industrial application.3 、Recovery technology on the leaching solution of Beryllium concentratesBeryllium ore leaching solution with 16.86g/l Be O concentration was carried for recycling experiments. The precipitation experiments was conducted by NH3 ? H2 O instead of Na OH solution, that made F in the leaching solution with NH3 ? H2 O to generate NH4 F, and reduced the fluoride impurity. It overcomes the adverse effects of F in the process of Be O recovery from beryllium leaching solution. In this study, it focused on the Be O precipitation rate with NH3 ? H2 O. And the effect of the amount of Na OH and water consumption for hydrolysis on Be O dissolution was analyzed. The optimal parameters for beryllium ore leaching solution recovered was acquired. The results showed that, the optimal precipitation p H was 8.5, the NH3 ? H2 O consumption was 130 ml, and the optimal Na OH consumption was 13 times of Be O mass, and the water consumption for hydrolysis was 5 times of filter liquor. The recovery rate of Beryllium oxide was more than 92.00%.4、Study on the method of removal sulfuric acid radical from beryllium hydroxideThe technology for removing sulfate ions contained in Beryllium hydroxide was researched with the washing method, barium chloride precipitation method and sodium hydroxide hydrolysis-precipitation method. And the removal rate of sulfate ions were compared and analyzed. As the results shown, the washing method to remove sulfate is ineffective, and its removal rate of only 50%. The effect of the barium chloride precipitation method to remove sulfate was obvious, the sulfate contained in beryllium hydroxide could be reduced to below 0.3%. However, the barium chloride precipitation method is relatively high cost, and accompanied by serious pollution problems. According to the characteristics of beryllium hydroxide and chemical properties, sodium hydroxide hydrolysis-precipitation method was proposed. This method with the use of sodium hydroxide could reduce the sulfate ion in beryllium hydroxide from 6.77% to 0.02% or less, and the removal rate reached to 99.7%. This method is low cost, less pollution, and will provide a valuable approach for the preparation of beryllium hydroxide with nuclear grade purity.