| China is one of the world’s boron resource-rich countries, Boron ore reserves ranked the fourth in the world. Boron ore resources in China mainly distributed in Liaoning, Jilin, Qinghai and Tibet provinces. At present, ore dilution of boron resources in Liaoning and Qinghai provinces are a serious problem due to mining for decades and abandoning low grade ores when mining high grade ores. The ascharite ore resources which is greater than the12%, can be directly used for chemical raw material, has less than2million tons. But the low-grade grade ascharite ore which is between6%and12%has great reserves. By the end of2009, the ascharite ore resources which grade is greater than12%in Dandong region was1.1625million tons, historical legacy of abandoned low grade boron ore estimate of100million tons, which provides resource base for the processing research of the low grade of boron ore. The purpose of this paper is to find an effective separation method of enriching the ascharite mineral from the gangue minerals such as serpentine, expanding boron ore reserves of resources available, taping the potential of existing boron ore resources, alleviating the shortage situation of boron ore, ensuring of boron industrial sustainable development.At first, the ascharite ore was characterized by spectral analysis, elemental analysis and XRD analysis, the results show that the ore is the low grade ascharite ore; the main gangue minerals is serpentine, followed by dolomite, calcium feldspar, brucite and so on. Then the pure mineral flotation was been done, the result suggest that sodium acid is more suitable as floatation collectors than dodecylamine. Calcium lignosulphonate is the best inhibitors of separating ascharite, serpentine and dolomite. Artificial mixed flotation separation test results show that calcium lignosulphonate is the best selective inhibitors of separating ascharite, serpentine and dolomite. When the amount is60mg/L, concentrate grade of16.05%, the recovery rate is75.59%.The effects of type, grinding fineness, type and dosage of inhibitor, dosage of collectors, flotation pulp concentration, pulp temperature, pH values, and flotation time on the flotation of low grade ascharite were investigated. Based on experiments, suitable processing parameters were obtained, i.e. Suitable for grinding fineness-0.07490%, slurry temperature31℃, concentration of flotation pulp22.4%, slurry pH value11.15, amount of dosage of sodium oleate500g/t, FLM31.25kg/t, floating time3min. Under this condition, the essential grade of mineral products is8.79%, the recovery rate is84.58%.Open circuit test and closed-circuit test were been done under the best technology and reagent conditions. Open circuit test results show that the final concentrate grade of flotation is13.01%, recovery rate is53.45%, after a roughing, two times concentration and a sweeping. Closed circuit test results indicate that the final concentrate grade of closed product is12.85%, concentrate yields is38.56%, concentrate recovery is74.39%; tailings yields is61.44%, tailings grade is3.44%in the case of ore grade6.65%. The test index is very well, meeting the desired objectives of the research.The ores was characterized by infrared spectroscopy (IR), ZETA potential and Scanning Electron Microscopy (SEM) to get an insight into the adsorption of ore surfaces, the electrokinetic of ores and the behavior of the solution chemistry. The Primary mechanism of interactions between floatation agents and minerals and the process behavior of flotation were discussed in the flotation process.In this paper, the recovery and utilization of the low grade ascharite mineral from was realized. The result of this study had a certain directing significance to resolve problems with recycling of the low grade of ascharite mineral. |
PDF Full Text Request