共查询到19条相似文献,搜索用时 69 毫秒
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高磷贫碳酸锰矿石微生物的脱磷机理 总被引:9,自引:2,他引:7
采用生尘芽孢杆菌对高磷贫碳酸锰矿石进行了微生物脱磷试验,探讨了其作用机理。结果表明,微生物脱磷过程主要是细菌代谢产物对难溶磷酸盐的解离作用和细菌的过量摄磷作用。 相似文献
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采用共生生金菌对碳酸锰矿石进行了微生物氧化试验,探讨了Eh的影响及微生物氧化锰的作用方式。结果表明,矿浆Eh高于510mV时,微生物才能有效地氧化碳酸锰矿石;微生物既能氧化固态的MnCO3,也能氧化游离态的Mn2+。 相似文献
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花垣锰矿南区贫碳酸锰矿石选矿研究 总被引:1,自引:0,他引:1
本文详细介绍了花垣锰矿南区贫碳酸锰矿石脱磷富集锰的选矿工艺。提供了强磁预选—高梯度深选和强磁选—黑锰矿法两个流程方案的小试指标。作者认为强磁选—高梯度深选的机械选矿方法是很有前途的方案。建议相应开展对细磨设备、微细粒矿物脱水设备与技术的研究工作。 相似文献
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通过对硫酸和废盐酸浸出低品位菱锰矿的浸出工艺进行实验研究,分别得到了两种方案的最佳工艺条件,比较了两种浸出方案的优劣,为后续试验开展打下了良好基础。 相似文献
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通过对高磷铁矿中磷灰石还原机理的分析,发现配加碱性添加剂有利于抑制磷灰石还原,减少珠铁中磷含量。试验首先向含碳球团中配加CaCO3调节碱度,并在此基础上分别添加Na2CO3、CaF2,研究碱度和添加剂对球团还原熔分后珠铁和渣中磷含量的影响,得到磷的分配情况。试验结果表明:提高碱度,配加Na2CO3、CaF2均有利于抑制高磷铁矿中磷灰石的还原,降低珠铁中的磷含量。在1 400℃,碱度为1.4,Na2CO3、CaF2的质量分数均为4%,反应时间为12min时,珠铁中磷含量达到最低,脱磷率达到81.2%。 相似文献
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In most cases, hot metal dephosphorization slag is saturated with dicalcium silicate, and the partition ratio of phosphorus between dicalcium silicate and liquid slag is high. These results indicate the important role of solid dicalcium silicate in dephosphorization. In order to understand the reaction kinetics and obtain an optimum treatment method, it is very important to know the influence of solid phases in the slag. In this study, a new reaction model for hot metal dephosphorization considering the effects of dicalcium silicate and dissolution rate of lime is proposed. In the new dephosphorization model, in addition to the reaction rate between liquid slag and metal, the partition between dicalcium silicate and liquid slag and the dissolution rate of lime are also considered. The dephosphorization reaction of hot metal by the liquid slag phase was calculated by using the coupled reaction model. The calculated results demonstrated the importance of dicalcium silicate in dephosphorization. Also, in some cases, the dissolution rate of lime affected the dephosphorization behaviour. 相似文献
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The purpose of this study is decreasing content of CaF2 in dephosphorization slag. The dephosphorization effects with CaF2 replaced by B2O3 were investigated. The dephosphorization experiments were carried at 1450℃ in air atmosphere. The results show that the melting points and dephosphorization ratios change little when B2O3 replaced CaF2. The dephosphorization ratios which are all greater than 80% and melting points can meet the requirement of hot metal pretreatment. Because of the change of alkalinity caused by B2O3, the oxidation of slag increases with increasing of B2O3 contents. It is beneficial to pre-dephosphorization. As a result, for decreasing its pollution, CaF2 can be replaced by B2O3 to dispose fluoride-free pre-dephosphorization slag. 相似文献