利用磷化渣制备电池级磷酸铁

doi:10.11962/1006-4990.2019-0583

摘要/Abstract

摘要：

以含锌磷化渣为原料,先用氢氧化钠浸取制得磷酸钠溶液,再采用萃取法去除该溶液中的微量锌,在净化液中加入六水合氯化铁反应制得磷酸铁产品。实验结果表明：采用氢氧化钠浸取磷化渣,能有效地去除磷化渣中的金属离子,获得含微量锌的磷酸钠溶液,磷酸根的浸取率可达93.97%,磷酸根的总利用率可达78.31%;采用双硫腙与P204萃取剂对该溶液进行萃取,其双萃取剂混合萃锌效果明显优于它们相应的单种萃取剂萃锌效果。在有机相与水相体积比=1∶5时,锌的单级萃取率可达55.39%,产品磷酸铁中锌含量低于30.0 μg/g。研究表明,采用氢氧化钠浸取和双硫腙与P204双萃取剂除杂的方法,可有效回收含锌磷化渣中的磷酸根并制备出电池级磷酸铁。

关键词: 含锌磷化渣, 磷酸铁, 双硫腙, P204

Abstract:

Using zinc-containing phosphating slag as raw material,firstly use NaOH leaching to obtain Na₃PO₄ solution,then remove the trace amount of zinc in the solution by extraction method and add FeCl₃·6H₂O to the purified liquid to obtain iron phosphate product.The experimental results showed that NaOH leaching can effectively remove the metal ions in the phosphate ing slag and then obtain the Na₃PO₄ solution containing a trace amount of zinc.The leaching rate of the phosphate can reach 93.97% and the total utilization rate can reach 78.31%.The dithizone and P204 extractants were used to extract the solution.The zinc extraction effect of double extractant was significantly better than their corresponding single extractant effect.When O∶A=1∶5,the extraction rate of zinc was up to 55.39% and the content of zinc in the product iron phosphate was less than 30.0 μg/g.Research showed that the use of NaOH leaching and dithizone and P204 double extractant impurity removal method can effectively recover the phosphate in the zinc-containing phosphating slag and prepare battery-grade iron phosphate.

Key words: zinc-containing phosphating slag, iron phosphate, dithizone, P204

中图分类号:

TQ126.35

欧小菊,柴琪,李正科,王威燕,杨运泉. 利用磷化渣制备电池级磷酸铁[J]. 无机盐工业, 2020, 52(10): 135-139.

Ou Xiaoju,Chai Qi,Li Zhengke,Wang Weiyan,Yang Yunquan. Preparation of battery grade iron phosphate from phosphating slag[J]. Inorganic Chemicals Industry, 2020, 52(10): 135-139.

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有机相	相比	锌萃取率/%	乳化情况
1.2 g/L双硫腙+CHCl₃	1∶3	40.43	不乳化
体积分数10%P204+CHCl₃	1∶3	1.79	有机相微乳化
1.2 g/L双硫腙+体积分数 10%P204+CHCl₃	1∶3	68.55	不乳化
1.2 g/L双硫腙+体积分数 10%P204+CHCl₃	1∶5	55.39	不乳化

序号	产品名称	耗（产）量/ （t·a^-1）	单价/ （元·t^-1）	产值/ 万元	备注
1	氢氧化钠	560	4 000	-224.00	原料
2	磷酸	240	5 350	-128.40	原料
3	三氯甲烷	8	2 200	-1.76	原料
4	双硫腙	0.009 6	1 200 000	-1.15	原料
5	P204	0.78	50 000	-3.90	原料
6	六水合氯化铁	1 440	2 400	-345.60	原料
7	磷酸铁	870	20 000	+1 740.00	产品
8	氧化铁	328	2 500	+82.00	副产品
年综合效益				+1 117.19

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