Priority of large and medium-sized phosphorite beneficiation for calcium magnesium phosphate fertilizer

Abstract

The invention provides a large and medium-sized phosphorite beneficiation and calcium magnesium phosphate fertilizer production synergistic process for preferentially applying large and medium-sized phosphorite beneficiation to calcium magnesium phosphate fertilizer production, which comprises the following steps: screening after coarse crushing of a mine, stacking more than ten thousand tons of bulk phosphorite, homogenizing for calcium magnesium phosphate fertilizer production, and conveying and floating undersize fine grains to obtain phosphate concentrate; the method is used for other phosphatic fertilizer or phosphorus chemical production. According to the process, the utilization rate of medium-low-grade phosphorite is increased, and tailing discharge is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of comprehensive utilization of phosphate rock resources, and in particular to an optimization method for the beneficiation process of large and medium-sized phosphate rocks. The method preferentially uses the large phosphate rocks after beneficiation for the production of calcium magnesium phosphate fertilizer, thereby ensuring the stable phosphate rock quality for the production of calcium magnesium phosphate fertilizer. The method also improves the grade of phosphate rocks used in other phosphate fertilizers or phosphate chemical industries, reduces the consumption of flotation reagents, lowers the beneficiation cost, and promotes the efficient utilization of raw phosphate rock. Background Art

[0002] With the widespread use of large-scale chemical fertilizers, soil acidification has become obvious, crop nutrition has become unbalanced, and the yield and quality of agricultural products have declined. Related support articles are as follows: 1) Lin Kehui. Effects of fertilization on the quality of agricultural products. Journal of Yunnan Agricultural University, 1994, 11(2): 114-120 2) Zhang Youshan. Comprehensive effects of soil, fertilizer and water on agricultural product quality and agricultural measures to improve quality. Beijing Agricultural Science, 1996, 14(2): 35-38 3) Liu Qin, Zhang Xin, et al. Relationship between soil plant nutrition, agricultural product quality, and human and animal health. Chinese Journal of Applied Ecology, 2001, 12(4): 623-626 4) Xu Xuehong, Wang Honghui. Further study on the effect of fertilization on the quality of agricultural products. Tillage and Cultivation, 2003, (2): 55-56 5) Wu Yun, Yang Jianhong. Study on soil acidification and fertility characteristics in Chongqing tea gardens. Soil Bulletin, 2004, (06): 715-719 6) Li Qingjun, Tian Liguang, et al. Analysis of soil acidification status and causes in orchards of Shandong Province. Shandong Agricultural Sciences, 2011, (10): 57-59 7) Sun Zhenrong, Yuan Ning, et al. Study on the relationship between soil, fertilizer, water and agricultural product quality and safety. Agricultural Science and Technology and Information, 2014, 6(431): 49-51 8) Zhuang Zhaonan. Causes and improvement measures of paddy soil acidification in Zhouning County. Fujian Agricultural Science and Technology, 2014, (9): 90-91 9) Chai Chunyan, Song Xuzhong, et al. Causes of soil acidification in bayberry gardens and improvement measures. Modern Horticulture, 2015, (7): 217-219 10) Zang Xiaoping, Wang Jiashui. Effects of soil magnesium application on mango yield and quality. Chinese Journal of Soil and Fertilizer, 2017, (3): 89-92 11) Wang Yunbiao, Chen Zongxian. Preliminary study on the improvement of rice soil acidification in Yongchuan District, Chongqing. Southern Agriculture, 2017, (19): 101-103

[0003] The output of calcium magnesium phosphate fertilizer has shrunk. Although many experts and research departments have continuously called for maintaining the output of calcium magnesium phosphate fertilizer, its downward trend has not been curbed; the grade calculated based on phosphorus alone is low, and the cost-effectiveness of fertilizer is not high; the production process is unstable and the cost is high, and production and sales are sluggish; the role of multiple nutrients in improving the quality of agricultural products and the improvement effect of alkaline calcium magnesium phosphate fertilizer on soil acidification have not been brought into play. Related support articles are as follows: 1) Huang Anzhi, Zhang Shuzong. Summary of Energy-saving Renovation Technology of No. 2 Blast Furnace of Calcium Magnesium Phosphate Fertilizer in Guangming Phosphate Mine. Yunnan Chemical Industry, 1987, (4): 12-17 2) Gong Minyi, Gong Zifu. Developing Hubei Huji mining area into a calcium magnesium phosphate fertilizer production base by leveraging resources and regional advantages. Phosphate Fertilizer and Compound Fertilizer, 1991, (1): 14-16 3) Bai Yingfen, Lu Zhenling. Re-evaluation of calcium magnesium phosphate fertilizer and superphosphate. Henan Chemical Industry, 1997, (7): 3-5 4) Yang Lin, Zhao Qingju. Production of 150,000 tons / year calcium magnesium phosphate fertilizer in blast furnaces. Phosphate and Compound Fertilizers, 1998, (4): 25-27 5) Li Anhu. Using dolomite instead of serpentine to produce calcium magnesium phosphate fertilizer, reducing costs and improving the working environment. Guizhou Chemical Industry, 2000, (Supplement): 13-16 6) Zeng Xiankun. Development and Prospect of China's Phosphate and Compound Fertilizer Industry. Phosphate and Compound Fertilizer, 2000, (1): 1-6, 11 7) Li Anhu. Feasibility study of calcium magnesium phosphate fertilizer without ball milling. Guizhou Chemical Industry, 2000, (1): 48-49, 53 9) Fan Renxuan. Several suggestions for stabilizing the production of calcium magnesium phosphate fertilizers in my country. Phosphate Fertilizers and Compound Fertilizers, 2006, (5): 22 10) Xu Xiucheng. Current status and prospects of calcium magnesium phosphate fertilizer development. China Agricultural Materials, 2006, (04): 56-58 11) Wang Tao. Several suggestions on the sustainable development of calcium magnesium phosphate fertilizers in my country. Phosphate Fertilizers and Compound Fertilizers, 2008, (5): 23-24 12) Yang Yuanpeng, Yang Zhengqian. Analysis of the market demand for calcium magnesium phosphate fertilizers in my country. Phosphate and Compound Fertilizers, 2009, (5): 17-18 13) Liu Heyun. my country should attach importance to the development of calcium magnesium phosphate fertilizer. Phosphate fertilizer and compound fertilizer. 2010, (3): 26-27 14) Liu Xianchen, Miao Jinyou. Effects of granular calcium magnesium phosphate fertilizer on yield and quality of European plum in Changbai Mountain. Northern Horticulture, 2013, (02): 171-172 16) Sun Zhili, Yao Zhiqi. Contribution and development of calcium magnesium phosphate fertilizer. Fertilizer Industry, 2017, (5): 1-5 17) Zhu Dongfang, Chen Mingliang. Re-understanding of calcium magnesium phosphate fertilizer. Fertilizer Industry, 2018, (1): 1-3, 18 18) Kuang Guoming. Current status and development prospects of calcium magnesium phosphate fertilizer industry in my country. Phosphate Fertilizer and Compound Fertilizer, 2021, (4): Foreword 19) Dong Chunyu, Wang Kai. Calcium magnesium phosphate fertilizer can reduce the absorption of Cd and As by different varieties of corn in mixed-polluted farmland. Chinese Soil and Fertilizer, 2022, (9): 51-56. 21) Wang Ying. Production status of my country's phosphate and compound fertilizer industry in 2016 and development trend in 2017. Phosphate and Compound Fertilizers, 2017, (6): 1-6 22) Wang Ying, Fang Junwen, et al. Operation status and development trend of my country's phosphate and compound fertilizer industry in 2021. Phosphate and Compound Fertilizer, 2022, (8): 1-8 23) Wang Ying, Fang Junwen, et al. Operation status and development trend of my country's phosphate and compound fertilizer industry in 2022. Phosphate and Compound Fertilizer, 2023, (6): 1-8 24) Wang Ying, Fang Junwen, et al. Operation status and development trend of my country's phosphate and compound fertilizer industry in 2023. Phosphate and Compound Fertilizer, 2024, (7): 1-8

[0004] After raw phosphate ore is coarsely and medium-crushed in jaw crushers and other equipment at the mine, it is transported by conveyors to other phosphate fertilizer or chemical production sites. Further crushing, screening, grinding, and flotation are performed to remove impurities such as silicon, magnesium, and iron, resulting in high-grade phosphate concentrate for production. The beneficiation of phosphate ore for high-concentration fertilizer and chemical production is labor-intensive, costly, and inefficient. According to Xiao Jianhua, a 2009 master's thesis from Guizhou University, "Research on Production Ore Blending Technology for Kailin Group," bulk ore contains low phosphorus and high levels of other gangue elements, as summarized in the table below. Screening out bulk ore for calcium magnesium phosphate production can reduce the consumption of milling and flotation agents. Related support articles are as follows: 1) Zhuang Lijie, Li Yingwu. Design of ore dressing process for Wengfu phosphate mine. Chemical Mining Technology, 1996, (5): 19-22 2) Li Anhu. Application of statistical methods in sampling and analysis of calcium magnesium phosphate fertilizer raw materials. Phosphate and Compound Fertilizers, 2001, (2): 21-23 3) Yang Zhen, He Jinbao. Research on improving the grade of phosphate ore using screening device. Chemical Minerals and Processing, 2011, (10): 19-20 4) DZ / T0209-2020 Specification for Phosphorus in Mineral Geological Exploration

[0005] Calcium magnesium phosphate fertilizer has long used raw materials from low-grade small mines, resulting in large fluctuations in quality; production ore blending is often adjusted, and good indicators cannot be controlled in the long term, resulting in frequent wind down and dead ends; it places high demands on the technical level of front-line production employees and the labor intensity is high. Related support articles are as follows: 1) Ning Peidong. Discussion on energy saving and economic benefits of calcium magnesium phosphate fertilizer in blast furnace. Chemical Engineering Design Communications. 1982(03): 6-13 2) Lin Shangzhi. Rational Utilization of Phosphate Rock Resources to Produce Calcium Magnesium Phosphate Fertilizer. Shaanxi Chemical Industry, 1989, (2): 26-28 3) Ouyang Guocai. Utilization and discussion of low-grade phosphate rock in the production of calcium magnesium phosphate fertilizer. Hubei Chemical Industry, 1989, (01): 38-42 4) Liu Jin, Gao Lin. Production of high-quality calcium magnesium phosphate fertilizer using medium and low-grade phosphate rock. Fertilizer Industry, 1998(01): 55-56 5) Tang Jixue. Application of powdered phosphate rock agglomeration in the production of calcium magnesium phosphate fertilizer. Phosphate Fertilizer and Compound Fertilizer, 2003, (02): 20 6) Zhao Jianguo, Zhang Zongfan, et al. Feasibility analysis of using phosphate rock flotation tailings to produce calcium magnesium phosphate fertilizer. Phosphate Fertilizer and Compound Fertilizer, 2011, (6): 17-20, 22

[0006] The calcium magnesium phosphate blast furnace method can be used to produce multi-nutrient trace fertilizers. Related support articles are as follows: 1) Liang Baolong. Processing and efficiency test of boron calcium magnesium phosphate fertilizer. Fertilizer Industry, 1982(05): 17-22 2) Ai Hualin. Production of Boron-Manganese-Phosphate Fertilizers Using Calcium-Magnesium-Phosphate Fertilizer Process. Phosphate Fertilizers and Compound Fertilizers. 1994, (02): 34-36 Summary of the Invention

[0007] Coarse crushing stage: The raw ore mined from phosphate rock is passed through a jaw crusher and other equipment to adjust the output particle size to <100mm.

[0008] Screening stage: Screen the coarsely crushed phosphate rock with a mesh size of 35mm to 60mm (adjusted according to the demand for bulk phosphate rock. When the demand is large, a 35mm small mesh screen can be used; when the demand is small, a 60mm large mesh screen can be used).

[0009] Uniform ore blending: Screen out large pieces of phosphate rock, merge and blend them evenly, and pile them up in units of 10,000 tons to ensure the particle size and grade stability of the ore used in the production of calcium magnesium phosphate fertilizer.

[0010] Fine ore transportation: Small pieces of phosphate rock (≤35mm-60mm) that fall under the screen are transported to other phosphate fertilizer or phosphate chemical production users according to the original transportation system. Further crushing, screening, grinding and flotation are carried out to remove impurities such as silicon, magnesium and iron to obtain high-grade phosphate concentrate for production.

[0011] The beneficial effects of the present invention are as follows:

[0012] The utilization rate of medium and low-grade phosphate rock has increased, and tailings emissions have decreased.

[0013] The production of calcium magnesium phosphate fertilizer achieves high yield, high quality and low cost.

[0014] The above description is only a specific embodiment of the present invention and is not intended to limit the scope of the present invention. Any equivalent changes, modifications and combinations made by any person skilled in the art without departing from the concept and principle of the present invention shall fall within the scope of protection of the present invention.

Claims

1. A method for beneficiating large and medium-sized phosphate rocks and preferentially using them for producing calcium magnesium phosphate fertilizers, characterized in that The following steps are involved: (1) After the raw ore is coarsely crushed, screening is added in the mine; (2) Large pieces of phosphate rock on the screen are combined and blended for use in the production of calcium magnesium phosphate fertilizer; (3) The small pieces of phosphate rock that have been screened out are transported according to the original system to other users of phosphate fertilizer or phosphate chemical production.

2. This method is suitable for large and medium-sized phosphate mines and calcium magnesium phosphate fertilizer production.

3. According to claim 1, it is characterized in that The phosphate rock is coarsely crushed ≤100mm.

4. According to claim 1, it is characterized in that The phosphate rock is screened after coarse crushing, and the mesh size is 35mm to 60mm (adjusted according to the demand for bulk phosphate rock. When the demand is large, a 35mm small mesh screen plate can be adjusted; when the demand is small, a 60mm large mesh screen plate can be adjusted).

5. According to claim 1, it is characterized in that The large pieces of phosphate rock on the screen are combined and evenly mixed, and piled up in units of ten thousand tons of phosphate rock to ensure the stability of the ore used in the production of calcium magnesium phosphate fertilizer.

6. According to claim 1, it is characterized in that The small pieces of phosphate rock (≤35mm-60mm) under the screen are supplied to other phosphate fertilizer or phosphate chemical production users according to the original transportation system.

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