十八烷基三甲基氯化铵反浮选提纯磷石膏及石英脱除机理研究

doi:10.19964/j.issn.1006-4990.2024-0356

Abstract

Abstract:

The existence of impurities such as silicon and organic matter in phosphogypsum seriously restricts the value-added utilization of phosphogypsum.Based on this，phosphogypsum as the by-product of a phosphorus chemical enterprise in Hubei Province was studied.The removal of impurities such as quartz and organic matter in phosphogypsum was studied by synchronous reverse flotation combined with pre-screening process，using octadecyl trimethyl ammonium chloride（1831） as desilication agent.The mechanism of 1831 was investigated by XRD，Zeta potential，contact Angle and XPS analysis.The results showed that the process combined with pre-screening and synchronous reverse flotation could effectively improve the quality of phosphogypsum concentrate.Under the optimal process conditions of screening at 178 μm，decolorizing agent TC-3 of 600 g/t，decolorizing agent 1831 of 100 g/t and rotating speed of 1 800 r/min，phosphogypsum concentrate could be achieved with the CaSO₄·2H₂O content of 94.543% and whiteness of 58.07%.The mechanism analysis showed that 1831 formed selective adsorption on quartz surface through hydrogen bonding，and then significantly enhanced the hydrophobicity and floatability of quartz.

Key words: phosphogypsum, reverse flotation, desiliconization and purification, quaternary ammonium salt

CLC Number:

TQ177.37

ZHAO Mengyan, CHEN Junwu, WANG Xun, WEI Na, WENG Xiaoqing, CHEN Yingxin. Study on purification of phosphogypsum by reverse flotation of octadecyl trimethyl ammonium chloride and its removal mechanism of quartz[J]. Inorganic Chemicals Industry, 2025, 57(4): 111-117.

Figures/Tables 14

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w（F）	w（Na₂O）	w（MgO）	w（Al₂O₃）	w（SiO₂）	w（P₂O₅）	w（SO₃）
0.37	0.12	0.07	0.51	5.87	0.92	54.76
w（CaO）	w（TiO₂）	w（Fe₂O₃）	w（SrO）	w（BaO）	w（Cl）	w（K₂O）
36.16	0.11	0.44	0.05	0.07	0.02	0.53

粒级/μm	产率/%	w（CaSO₄· 2H₂O）/%	回收率/ %	白度/ %
>297	0.37	24.576	0.11	20.10
178~297	2.25	73.292	1.97	21.87
150~<178	7.98	93.975	8.88	40.88
106~<150	18.95	92.793	20.81	43.12
74~<106	26.52	93.558	29.37	54.31
48~<74	23.99	92.882	26.38	55.32
38~<48	4.31	85.641	4.37	51.03
18~<38	3.19	68.900	2.60	51.03
<18	12.44	37.464	5.51	20.11
原矿	100	84.467	100	21.01

元素	石英		石英+1831		偏移量结合能/eV
元素	结合能/ eV	原子数分数/%	结合能/ eV	原子数分数/%	偏移量结合能/eV
C 1s	284.80	16.42	284.72	23.64	-0.08
O 1s	532.02	58.34	532.06	50.61	0.04
N 1s			402.00	1.43
Si 2p	102.82	25.24	102.88	24.32	0.06

National Inorganic Salts Information Center

Inorganic Acid-Base-Salt Committee of CIESC

Study on purification of phosphogypsum by reverse flotation of octadecyl trimethyl ammonium chloride and its removal mechanism of quartz

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