Effect of different carbon sources on vacuum carbothermal reduction of low-grade phosphorus ore

IF 1 4区 工程技术 Q4 CHEMISTRY, APPLIED Chemical Industry & Chemical Engineering Quarterly Pub Date : 2021-01-01 DOI:10.2298/CICEQ210219013H
X. He, Run Huang
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引用次数: 1

Abstract

In this study, the effect of different carbon sources on the carbothermal reduction of low-grade phosphate ore were examined using FactSage7.2 calculations and vacuum reduction experiments. The thermodynamic calculations showed that the trend of the effect for three types of reducing agents was generally consistent under 1 Pa pressure and 14% carbon dosage. The reduction effect was maximum when graphite was used as the reducing agent, and a maximum mass of P was obtained at 1250 ?C. The vacuum experiment results showed that the reduction and volatilization ratios of phosphate rock increased with temperature for different carbon sources. Maximum reduction ratio was obtained using graphite in the temperature range 1250-1300?C. The reduction effect of pulverized coal was optimal at 1350?C, when SiO2, Al2O3, and MgO in the pulverized coal ash were exposed to form low-melting eutectics with CaO due to the increased degree of reaction, and the heat and mass transfer rates were increased. At this time, a maximum reduction ratio of 51.77% of the sample and a maximum volatilization ratio of 82.44% of P were achieved. Considering the cost effectiveness, pulverized coal was the optimum carbon source for the treatment of low-grade phosphate rock using vacuum carbothermal reduction.
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不同碳源对低品位磷矿真空碳热还原的影响
采用FactSage7.2计算和真空还原实验,考察了不同碳源对低品位磷矿碳热还原的影响。热力学计算表明,在1 Pa压力和14%碳投加量下,三种还原剂的效果趋势基本一致。以石墨为还原剂时,还原效果最好,P的质量在1250℃时达到最大。真空实验结果表明,对于不同碳源,磷矿的还原率和挥发率随温度的升高而升高。石墨在1250 ~ 1300℃范围内的还原率最大。煤粉在1350℃时还原效果最佳。C,当粉煤灰中的SiO2、Al2O3和MgO与CaO反应程度增加而形成低熔点共晶时,传热传质速率提高。此时,样品的最大还原率为51.77%,P的最大挥发率为82.44%。考虑到成本效益,煤粉是真空碳热还原法处理低品位磷矿的最佳碳源。
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来源期刊
Chemical Industry & Chemical Engineering Quarterly
Chemical Industry & Chemical Engineering Quarterly CHEMISTRY, APPLIED-ENGINEERING, CHEMICAL
CiteScore
2.10
自引率
0.00%
发文量
24
审稿时长
3.3 months
期刊介绍: The Journal invites contributions to the following two main areas: • Applied Chemistry dealing with the application of basic chemical sciences to industry • Chemical Engineering dealing with the chemical and biochemical conversion of raw materials into different products as well as the design and operation of plants and equipment. The Journal welcomes contributions focused on: Chemical and Biochemical Engineering [...] Process Systems Engineering[...] Environmental Chemical and Process Engineering[...] Materials Synthesis and Processing[...] Food and Bioproducts Processing[...] Process Technology[...]
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