湿法浓磷酸快速沉降技术研究

doi:10.19964/j.issn.1006-4990.2024-0573

Abstract

Abstract:

The viscosity of wet process concentrated phosphoric acid is high，and it is difficult for fine-grained suspended solids to settle quickly，which reduces the processing and production efficiency of phosphorus chemical products.In this paper，the effects of defluorination agent type，defluorination temperature，pressure and time on the fluorine content and sedimentation of wet process concentrated phosphoric acid were studied.The results showed that the mass fraction of fluorine in wet concentrated phosphoric acid was only 0.38%，and the sedimentation time was much lower than that of other sedimentation technologies，when the defluorination agent was silica，the vacuum degree was 0.08 MPa，the reaction temperature was 85 ℃ and the reaction time was 2.0 h.The sedimentation time was positively correlated with the fluorine content.The lower the fluorine content，the shorter the sedimentation time of wet process concentrated phosphoric acid.The precipitates before and after defluorination of wet process concentrated phosphoric acid were analyzed by X-ray photoelectron spectroscopy（XPS），X-ray diffraction（XRD） and scanning electron microscopy（SEM）.The results showed that the main reason affecting the sedimentation rate was that the fine-grained CaSO₄·2H₂O in the solution was difficult to settle.Under a certain temperature and pressure，the fine-grained CaSO₄·2H₂O was recrystallized，the particle size was increased，and it was easy to settle.Secondly，the concentration and heating process disrupted the complexation bonds between metal cations and fluoride ions in wet process concentrated phosphoric acid，causing the solubility of the complex. It disrupted the colloid stability of the complex，causing fluoride to escape from the system.Simultaneously，the released metal ions formed new substances that induced the agglomeration of solid phase particles，further increasing the size and density of particles.Thereby the sedimentation of wet process concentrated phosphoric acid was accelerated.The results of this study provided a new method for the rapid sedimentation of wet process concentrated phosphoric acid.

Key words: wet process concentrated phosphoric acid, rapid subsidence, defluorination

CLC Number:

TQ126.3+5

YANG Wenjuan, GONG Li, FU Yizhong, JIANG Wei, TU Zhongbing, XIE Mi, ZHU Guihua. Study on rapid deposition technology of wet process concentrated phosphoric acid[J]. Inorganic Chemicals Industry, 2025, 57(11): 59-64.

Figures/Tables 10

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References 14

[1]	何宾宾.对我国磷氟协同发展的思考与建议［J］.云南化工，2024，51（S1）：20-24.
	HE Binbin.Thoughts and suggestions on the coordinated development of phosphorus and fluorine in China［J］.Yunnan Chemical Technology，2024，51（S1）：20-24.
[2]	薛河南.湿法磷酸预处理工艺实验研究及技术应用［J］.磷肥与复肥，2020，35（5）：27-30.
	XUE Henan.Experimental study and technical application of WPA pretreatment process［J］.Phosphate & Compound Fertilizer，2020，35（5）：27-30.
[3]	王佩.湿法磷酸氨化料浆的絮凝沉降及其分离的研究［D］.武汉：武汉工程大学，2017.
	WANG Pei.Study on the flocculation，sedimentation and separation of the ammoniated slurry of wet phosphoric acid［D］.Wuhan：Wuhan Institute of Technology，2017.
[4]	李建闻，解秘，朱桂华.不同离子型聚丙烯酰胺在湿法磷酸生产中的应用研究［J］.磷肥与复肥，2023，38（11）：31-33.
	LI Jianwen， XIE Mi， ZHU Guihua.Application of different ionic polyacrylamide in wet-process phosphoric acid production［J］.Phosphate & Compound Fertilizer，2023，38（11）：31-33.
[5]	CHEN Shuichang， LI Shiqian， WU Wanghua，et al.To treat wastewater with wastes：A highly efficient flocculant from fly ash and rice straw［J］.RSC Advances，2024，14（44）：32389-32397.
[6]	QIU Jinghong， WANG Hui， DU Zongliang，et al.Preparation of polyacrylamide via dispersion polymerization with gelatin as a stabilizer and its synergistic effect on organic dye flocculation［J］.Journal of Applied Polymer Science，2018，135（21）：46298.
[7]	HE Binbin， ZHU Yuanzhi， ZU Yun，et al.Designing an efficient fluorine recovery strategy for wet-process phosphoric acid purification by disclosing competitive complexation behavior between fluorine species and metal cations［J］.Separation and Purification Technology，2023，320：124219.
[8]	HE Binbin， ZHU Yuanzhi， ZU Yun，et al.Efficient and cost-effective fluorine recovery from liquid-phase wet-process phosphoric acid via two-step precipitation method［J］.Separation and Purification Technology，2023，325：124687.
[9]	ANOUAR I， JOURAIPHY R， MAZOUZ H，et al.Enhancing wet phosphoric acid production efficiency with vanadium catalyst waste derived silica［J］.Heliyon，2024，10（21）：e38968.
[10]	何宾宾，周琼波，张晖，等.湿法磷酸汽提法脱氟技术研究［J］.无机盐工业，2016，48（9）：49-50.
	HE Binbin， ZHOU Qiongbo， ZHANG Hui，et al.Study on defluorination for purifying wet-process phosphoric acid by steam stripping［J］.Inorganic Chemicals Industry，2016，48（9）：49-50.
[11]	张正，刘明高，李防，等.湿法磷酸生产中沉降剂的研究及应用［J］.山东化工，2020，49（14）：38-39，43.
	ZHANG Zheng， LIU Minggao， LI Fang，et al.Application of flocculant in production of WPA［J］.Shandong Chemical Industry，2020，49（14）：38-39，43.
[12]	张利锋，王凯，王晓飞，等.硅藻土衍生硅碳负极材料的制备及其储锂性能研究［J］.陕西科技大学学报，2024，42（5）：119-125.
	ZHANG Lifeng， WANG Kai， WANG Xiaofei，et al.Study on preparation of diatomite-derived silicon carbon anode material and its lithium storage performance［J］.Journal of Shaanxi University of Science & Technology，2024，42（5）：119-125.
[13]	李霁，欧卓华，曹仲，等. Fe₃O₄/MoS₂改性生物炭活化过硫酸盐协同单宁酸调理污泥［J］.环境科学与技术，2024，47（8）：35-43.
	LI Ji， Zhuohua OU， CAO Zhong，et al.Tannic acid coupled with Fe₃O₄/MoS₂ modified biochar to activate permonosulfate for improving sludge dewaterability［J］.Environmental Science & Technology，2024，47（8）：35-43.
[14]	HE Binbin， ZHU Yuanzhi， XIE Delong，et al.Removal of Al³⁺ and Mg²⁺ ions in wet-process phosphoric acid via the formation of aluminofluoride complexes［J］.Environmental Technology，2023，44（7）：936-947.

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Inorganic Acid-Base-Salt Committee of CIESC

Study on rapid deposition technology of wet process concentrated phosphoric acid

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