氟化铵溶解含氟硅渣制备氟硅酸铵的实验研究

doi:10.11962/1006-4990.2019-0083

Abstract

Abstract:

Ammonium fluosilicate was prepared with ammonium fluoride solution and fluorinated silica slag as raw materials by chemical dissolution.The effects of reaction temperature,reaction time,concentration of ammonium fluoride solution and material ratio（amount-of-substance ratio of ammonium fluoride to silica） on the yield of ammonium fluosilicate and conversion of silicon dioxide were investigated.The experimental results showed that the reaction temperature was 93 ℃,the reaction time was 60 min,the mass fraction of ammonium fluoride solution was 20%~30%,the materials ratio was 6∶1.1 and the stirring speed of reaction system was at 200~300 r/min.Under the conditions,the yield of ammonium fluosilicate and the conversion of ammonium fluoride can be controlled over 90%.

Key words: ammonium fluoride, silicon slag, ammonium fluosilicate

CLC Number:

TQ124.3

Sui Yanfeng,Liu Songlin,Qin Hong. Experimental study on preparation of ammonium fluosilicate from fluorinated silica slag dissolved by ammonium fluoride[J]. Inorganic Chemicals Industry, 2020, 52(1): 76-78.

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References 12

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反应温度/℃	氟硅酸铵收率/%	氟化铵转化率/%	反应温度/℃	氟硅酸铵收率/%	氟化铵转化率/%
70	50.34	51.43	85	76.76	77.65
75	60.92	61.60	90	85.53	86.35
80	70.51	72.12	93	87.65	88.76

反应时间/min	氟硅酸铵收率/%	氟化铵转化率/%	反应时间/min	氟硅酸铵收率/%	氟化铵转化率/%
30	70.43	71.67	60	88.79	89.50
40	78.76	79.60	70	89.45	90.35
50	84.55	84.73	80	89.65	90.87

物料配比	氟硅酸铵收率/%	氟化铵转化率/%	物料配比	氟硅酸铵收率/%	氟化铵转化率/%
6:1.00	88.76	89.34	6:1.15	91.01	90.99
6:1.03	89.05	89.25	6:1.20	91.23	91.28
6:1.06	89.56	89.63	6:1.25	91.15	91.35
6:1.10	90.11	90.17

氟化铵溶液质量分数/%	氟硅酸铵收率/%	氟化铵转化率/%	氟化铵溶液质量分数/%	氟硅酸铵收率/%	氟化铵转化率/%
15	88.56	88.62	30	90.38	90.53
20	90.13	90.56	35	88.95	89.21
25	90.25	90.43	40	88.37	88.96

搅拌速度/ （r·min^-1）	氟硅酸铵收率/%	氟化铵转化率/%	搅拌速度/ （r·min^-1）	氟硅酸铵收率/%	氟化铵转化率/%
100	90.72	90.99	250	90.38	90.53
150	90.08	90.24	300	90.45	89.57
200	90.22	90.31	350	90.46	88.76

National Inorganic Salts Information Center

Inorganic Acid-Base-Salt Committee of CIESC

Experimental study on preparation of ammonium fluosilicate from fluorinated silica slag dissolved by ammonium fluoride

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