磷矿脱镁废液制备氟化镁工艺研究

Abstract

Abstract:

:Waste liquid produces from the demagging of low grade phosphate ore, mainly containing magnesium,phosphate,calcium,ferric,aluminum,and sulfate plasma etc..The method of preparing magnesium fluoride by adding ammonium fluo-ride solution after removing impurity ion from magnesium removal waste solution by pretreatment was studied.The optimized purification conditions of demagging liquor were:pH 9.0~9.5,and the reaction temperature of 60 ℃.Under these conditions,the removal rates of phosphate,calcium,ferric and aluminum ions were 96.89%,95.41%,100% and 100%,respectively.Double decomposition reaction optimization conditions:reaction temperature was 60 ℃,and the drying temperature was 300 ℃.The magnesium fluoride obtained through this process conformed to the requirements of MF-2 specified in the Stan-dard,YS/T 691—2009,with a fluorine yield of over 92%.This method had high economic benefits as its process was simple and its utilization rate of raw material was high.

Key words: demagging liquor, magnesium fluoride, ammonium fluoride

CLC Number:

TQ132.32

Kong Xiaoyan,Huang Zhong,Yu Ying,Ju Li,Liang Lei,He Jun. Study on the preparation of magnesium fluoride from demagging liquor of phosphate ore[J]. Inorganic Chemicals Industry, 2019, 51(3): 57-58.

pH	滤液中各成分质量分数
pH	w （P₂O₅）	w （SO₃）	w （MgO）	w （CaO）	w （Fe₂O₃）	w （Al₂O₃）
4.0~4.5	0.50	3.80	1.210	0.250	0.006	0.004
6.0~6.5	0.11	3.50	0.993	0.080	未测出	未测出
9.0~9.5	0.02	3.36	0.800	0.016	未测出	未测出

温度/ ℃	滤液中各成分质量分数
温度/ ℃	w （P₂O₅）	w （SO₃）	w （MgO）	w （CaO）	w （Fe₂O₃）	w （Al₂O₃）
40	0.023	3.40	0.80	0.019	未测出	未测出
60	0.020	3.36	0.80	0.016	未测出	未测出
80	0.019	3.37	0.81	0.017	未测出	未测出

温度/ ℃	w（F）/ %	w（Mg）/ %	w（Ca）/ %	w（SiO₂）/%	w（P₂O₅）/%	w（SO₄^2-）/%
110	46.09	34.85	0.65	0.030	0.014	1.22
200	48.14	34.06	0.59	0.016	0.010	1.22
300	49.18	33.56	0.51	0.014	0.006	1.13

项目		w（F）	w（Mg）	w（Ca）	w（SiO₂）	w（Fe₂O₃）	w（SO₄^2-）	w（H₂O）
MF-2		≥45	≥28	—	≤0.9	≤1.1	≤1.3	≤1.0
样品	1^#	49.18	33.56	0.51	0.014	未测出	1.13	0.10
	2^#	49.31	33.51	0.49	0.014	未测出	1.08	0.20
	3^#	49.12	33.64	0.53	0.010	未测出	1.10	0.16

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National Inorganic Salts Information Center

Inorganic Acid-Base-Salt Committee of CIESC

Study on the preparation of magnesium fluoride from demagging liquor of phosphate ore

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