Study on the pelletizing process of medium- and low-grade phosphate rock powders

Xie Weimin


Abstract: In this paper, the impact of several pelleting process parameters on the quality of the resultant pellets was investigated by using a disk pelletizer with low- and medium-grade phosphate rock powders as the raw material. The results show that the optimized compressive strengths of raw and dried pellets were 12.84 N and 54.58 N, respectively, when the material fineness was -0.074 mm with an 86.60% content, the amount of added bentonite was 2.5%, the wetting moisture was 8% and the raw pellet moisture content was 10%. The compressive strength of the finished product reached 930 N using a preheating temperature of 600 °C for 10 min, and calcination temperature of 1200 °C for 10 min. A study on the mineral phase of the finished balls showed that the increased pellet strength after calcination was caused by a solid-state reaction within the pellets during the high-temperature calcination process. This process caused volume shrinking and a compacted structure of the pellets, and the pellet particles were sintered into a plate.


Key words: calcination; compressive strength; low and medium grade phosphate rock powder; pellet; pelletization

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Biao. Luo. (2012) Utilization of fine ore of elemental phosphorus production and its pelleting technology. Phosphate & Compound Fertilizer, 27(5):61-63.

Changli. Cai., Zhimin. Yang., Hao. Lin. (2014)Technology development and utilization of phosphate rock pellet containing carbon. Phosphate & Compound Fertilizer,29(03):57-59.

Chengdu Le Chemical Engineering Co., Ltd. (2015) A method for Producing Yellow Phosphorus From Mud Phosphorus Slag and Phosphate Rock Powder, China, CN201510336915.4[P].2015-9-23.

Dongsheng. He., Xing. Liu., Can. Peng., Ze. Zou. (2017) Double Reverse Flotation of a Phosphate Rock in Hubei. Industrial Minerals & Processing,46(01):1-3.

Huimin. Feng., Yonghua. Wang. (2009)Explore Mechanism of Benonite in Iron Ore Pelletting. China non-metallic mining industry herald (06):15-18+30.

Junfa. Tao. (2008) Present status and development prospect of yellow phosphorus industry in China. Inorganic Chemicals Industry (06):1-4, 10.3969/j.issn.1006-4990.2008.06.001.

Qi. Zheng., Wenbin. Zhang. (1998) The treatment of carbonate phosphate ores by roasting-slaking process. Multipurpose Utilization of Mineral Resources (03):5-9.

Yuping. Zhu. (2008) Review of Phosphorite Pre-treatment Methods for Furnace-process Phosphorus Production. Sulphur Phosphorus & Bulk Materials Handling Related Engineering,(04):31-34+52.

Zhigang. Xue., Ruichen. Ren., Caixia. Li. (2008) Analysis of influencing factors on stone coal ball making. Journal of liaoning technical university(natural science edition), (S1):314-316.

Zhiwei. Wu., Zhian. Song. (1994) Technology development and utilization of phosphate rock pellet. Phosphate & Compound Fertilizer,9(2):12-15.

Zongkuo. Luo., Xing. Du., Yong. Huang., Hui. Luo., Changshou. Ren. (2017)Technology of Producing Yellow Phosphorus with Enrichment of Low-Graded Phosphate Rock. Chemical Fertilizer Industry,44(02):1-3+34.


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