年处理100万t中低品位磷矿高效清洁生产工艺

doi:10.11962/1006-4990.2020-0180

Abstract

Abstract:

Efficient and clean comprehensive utilization of low and medium grade phosphate rock is a common bottleneck in the development of basic phosphorus chemical industry in China. Based on the pilot results of integrated comprehensive uti-lization of phosphorus-calcium-magnesium in low-grade phosphate rock,the high-quality phosphate concentrate [w（P₂O₅）≥36%, w（MgO）≤0.5%] can be obtained by directly treated of low and medium grade phosphate rock through innovative integrated technology,which can be used in any wet-process phosphoric acid and thermal yellow phosphorous production process,and the high value-added magnesium hydroxide and light calcium carbonate can be recovered simultaneously.All phosphorus in this process were recovered,and no tailings or waste water were discharged.The implementation of the project is of great sig-nificance to promote the sustainable development of China′s phosphorus chemical industry and solve the Three Phosphorus problem from the source.

Key words: low and medium grade phosphate rock, efficient and clean utilization, innovative integrated technology, phosphorus chemical sustainable development

CLC Number:

TQ126.3

Zhang Fuqiang,Lu Yulian,Zhang Lanxi,Han Yu,Zhang Jiao,Zhang Qin. Efficient and clean production process for treating 1×10⁶ t/a of low and medium grade phosphate rock[J]. Inorganic Chemicals Industry, 2020, 52(11): 52-55.

序号	产品名称	生产规模/ （万t·a^-1）	产品方案
1	精磷矿	52	w（P₂O₅）≥36%,w（MgO）≤0.5%
2	轻质碳酸钙	28	w（CaCO₃）≥98.0%
3	氢氧化镁	11	w[Mg（OH）₂]≥98.0%

项目	反应热/（kJ·mol^-1）
项目	700 ℃	750 ℃	800 ℃	850 ℃	900 ℃	940 ℃
白云石一次分解	85.50	82.37	79.17	75.81	72.38	70.08
碳酸钙分解	170.45	169.55	168.62	167.67	166.69	165.76

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Inorganic Acid-Base-Salt Committee of CIESC

Efficient and clean production process for treating 1×10⁶ t/a of low and medium grade phosphate rock

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Efficient and clean production process for treating 1×106 t/a of low and medium grade phosphate rock