Release Auxiliary Method Of Comprehensive Utilization Of Boron Iron Ore And The Preparation Of Magnesium Borate Whisker

Boron and its compounds is widely used in national defense, chemical industry, metallurgy, medicine, agriculture, nuclear industry and other fields due to its special performance. Direct use of boron resources are mainly boron and magnesium quarry, but its reserves account for only10%of boron resources in China, and have almost been exhausted after decades of mining that can not meet the requirements of the development of boron industry. Boron ore in China accounts for about60%boron resources but mainly low-grade lean ore and it is difficult to process that the main mineral consist magnetite and szaibelyite with fine particle size and each with a complex symbiotic relationship between the elements. So to speed up development and utilization of boron ore has a very important significance for easing strain on the status of boron resources. At present, the utilization routes for ludwigite expose many shortcomings, such as complicated process, serious corrosion of equipment, high energy consumption and so on. In this thesis, one simple operation and environmental friendly process-release additive method was developed to utilize iron boron. Besides, the obtained boron concentrated was tried to synthesize magnesium borate but the result was unsatisfied because of the high impurity. So the reactant was replaced with the analytically pure regent to prepare magnesium borate. The main contents are as follows in this thesis:(1)The release mechanism of auxiliary method of comprehensive utilization of paigeite. The release fertilizer method was projected and the preliminary results show that it is effective for comprehensive utilization of paigeite craft, of the X-ray diffraction and scanning electron microscope was used to investigate the changement of paigeite with different ammonium salt as fertilizer and determined the fertilizer release mechanism was that the ammonium sulfate decomposed into liquid ammonium hydrogen sulfate,firstly, and then it reacted with szaibelyite of boron iron ore that finished the seperation.of camsellite and magnetite(2) Optimization of process conditions. Boron ore from Liaoning Province Wengquangou was chosen as the raw material. The effect of additives content, calcination temperature and the grinding particle size etc. on the separation were investigated. The content of boron, iron, magnesium, calibration were determined by complexometric titration method. The concentrated iron with50%(TFe) and boron ore with13%were obtained in the optimum process conditions, and their recovery rate is both around80%.(3) The preparation of magnesium borate whisker. Firstly, the precursor was prepared via sol-gel method. Then the magnesium borate whisker was synthesized through high temperature molten salt route. During the experiments, the obtained concentrated iron was tried to prepare magnesium borate whisker, but the results show unsatisfied because of the high impurity. So the reactant was replaced with the analytically pure regent. Meanwhile, the effect of different glues on the whisker.was investigated and obtained the product with good uniformity.