Study on the Factors Influencing on Potassium Feldspar - Phosphogypsum - Activated Carbon Potassium Extraction Process
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摘要:
钾长石-磷石膏-焦炭提取钾肥是利用非可溶性钾资源的可行工业化路线，其中焦炭与磷石膏的反应过程是影响提钾率的关键，本文研究了N2或CO2气氛下活性炭比例对体系提钾率的影响，并采用了随炉升温与定温加料两种不同的焙烧温度制度对比了不同气氛下的提钾率和焙烧产物。结果表明，随着活性炭在体系中含量的升高，提钾率出现先上升后下降的趋势。在N2气氛下，采用定温加料体系的提钾率大于随炉升温的提钾率；在CO2气氛下，当活性炭与磷石膏的比例小于3∶6，定温加料样品的提钾率大于随炉升温的样品，而活性炭与磷石膏的比例大于3∶6，随炉升温样品的提钾率大于定温加料样品。
Abstract:Extracting process of potassium fertilizer with potassium feldspar-phosphogypsum-coke system is a feasible industrialization route to utilize insoluble potassium resources, in which the reaction process of coke and phosphogypsum is the key to raise the potassium extraction rate. In this paper, the influence of the ratio of activated carbon to phosphogypsum on potassium extraction rate is studied under N2 or CO2 atmosphere. Two different roasting temperature systems, heating up with the furnace and feeding at constant temperature, are used to compare the potassium extraction rate and roasted products under different atmospheres. The results showed that as the content of activated carbon in the system increased, the potassium extraction rate increased first and then decreased. Under N2 atmosphere, the rate of potassium extraction in samples that heating with constant temperature is greater than that of samples heating with the furnace. In CO2 atmosphere, when the ratio of activated carbon to phosphogypsum is less than 3:6, the potassium extraction rate of samples heating with constant temperature is greater than that of samples heating with the furnace; when the ratio of activated carbon to phosphogypsum is greater than 3∶6, the potassium extraction rate of samples heating with the furnace is greater than that of samples heating with constant temperature.
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表 1 钾长石与磷石膏的主要成分/%
Table 1. Chemical compositions of feldspar and phosphogypsum
名称 SiO2 Al2O3 Fe2O3 CaO K2O Na2O SO3 MgO P2O5 钾长石 65.83 17.18 2.05 2.04 7.28 2.05 0 0.51 0 磷石膏 4.51 0 0.13 39.98 0 0 54.11 0.21 1.29 
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