螯合抑制剂BAPTA在菱镁矿与方解石浮选分离中的作用机理

印万忠; 孙浩然

doi:10.13779/j.cnki.issn1001-0076.2022.02.013

螯合抑制剂BAPTA在菱镁矿与方解石浮选分离中的作用机理

印万忠,
孙浩然^,

东北大学资源与土木工程学院，辽宁沈阳 110819

基金项目:
国家自然科学基金面上项目(51874072、51974064和52174239);中央高校基本科研业务专项资金资助(N2101025)

详细信息

作者简介: 印万忠(1970-)，男，浙江临安人，博士，教授，主要从事矿物综合利用研究，E-mail: yinwanzhong@mail.neu.edu.cn

通讯作者: 孙浩然(1994-)，男，河南商丘人，博士研究生，主要从事矿物综合利用研究，E-mail: 18842504743@163.com

中图分类号: TD923⁺.14;TD973⁺.9

收稿日期: 2022-04-02

刊出日期: 2022-04-25

Mechanism of Chelating Depressant BAPTA in Flotation Separation of Magnesite and Calcite

YIN Wanzhong,
SUN Haoran^,

School of Resources & Civil Engineering, Northeastern University, Shenyang 110819, Liaoning, China

More Information

Corresponding author: SUN Haoran, 18842504743@163.com

Received Date: 02 April 2022

Publish Date: 25 April 2022

摘要

摘要:
由于菱镁矿和方解石具有相似的晶体结构和化学性质，故通过浮选较难实现二者的有效分离。BAPTA作为一种Ca-选择性螯合剂，被用以改善菱镁矿与方解石的浮选分离。浮选试验结果表明，在油酸钠体系下，BAPTA能选择性地抑制方解石上浮，且在矿浆pH值11.0、BAPTA用量30 mg/L和油酸钠用量100 mg/L的条件下，可较好实现菱镁矿(回收率91.06%)与方解石(回收率7.37%)的浮选分离。利用Zeta电位、FTIR和XPS等检测方法研究了BAPTA的选择抑制机理，结果表明，BAPTA能选择性地与方解石表面的Ca发生反应，吸附并罩盖在方解石表面，阻止油酸钠在方解石表面吸附，消除油酸钠给方解石带来的零电点负移的影响，但BAPTA对菱镁矿表面的Mg作用较小，故对菱镁矿吸附油酸钠的影响较小。
- 菱镁矿 /
- 方解石 /
- BAPTA /
- 选择性抑制 /
- 浮选分离
Abstract:
It is difficult to achieve the effective separation of magnesite from calcite because of their similar chemical and crystal properties. As a Ca selective chelator, BAPTA was used to improve the flotation separation of magnesite and calcite. The flotation test results showed that BAPTA could selectively inhibit the upward flotation of calcite in the sodium oleate system, and the flotation recovery difference between magnesite (recovery: 91.06%) and calcite (recovery: 7.37%) was large at pH 11.0, BAPTA dosage of 30 mg/L and sodium oleate dosage of 100 mg/L, which revealed that the flotation separation of magnesite and calcite could be realized. The selective depression mechanism of BAPTA was studied by Zeta potential, FTIR and XPS. The results indicated that BAPTA could selectively react with Ca on the surface of calcite, adsorb and cover the surface of calcite, prevent the adsorption of sodium oleate onto calcite surface, and eliminate the negative shift of zero electric point caused by sodium oleate on calcite. However, BAPTA had a little influence on Mg on the surface of magnesite, so it has a little effect on the adsorption of sodium oleate on magnesite.
- magnesite /
- calcite /
- BAPTA /
- selective depression /
- flotation separation

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图 1 BAPTA的结构

Figure 1.

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图 2 矿物X射线衍射图谱

Figure 2.

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图 3 浮选试验流程

Figure 3.

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图 4 矿浆pH值对矿物浮选回收率的影响

Figure 4.

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图 5 5BAPTA用量对矿物浮选回收率的影响

Figure 5.

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图 6 BAPTA用量对混合矿浮选指标的影响

Figure 6.

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图 7 不同药剂作用下矿物表面Zeta电位随矿浆pH值变化关系曲线

Figure 7.

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图 8 不同条件下矿物表面红外光谱

Figure 8.

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图 9 自然条件下菱镁矿(a)和方解石(b)的单矿物X射线光电子能谱

Figure 9.

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图 10 分离条件下菱镁矿(a)和方解石(b)的单矿物X射线光电子能谱

Figure 10.

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表 1 单矿物化学组分分析

Table 1. Chemical analysis of pure minerals /%

矿物	MgO	CaO	SiO₂	Al₂O₃	TFe	纯度
菱镁矿	45.68	1.20	0.80	0.055	0.15	95.93
方解石	0.31	55.55	< 0.05	0.22	0.019	99.15

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表 2 试验主要试验试剂

Table 2. Main reagents list of test

试剂名称	化学式	纯度	用途	生产商
油酸钠	C₁₈H₃₃O₂Na	分析纯	捕收剂	MACKLIN., Shanghai
BAPTA	C₂₂H₂₀N₂Na₄O₁₀	化学纯	抑制剂	MACKLIN., Shanghai
盐酸	HCl	分析纯	pH调整剂	MACKLIN., Shanghai
氢氧化钠	NaOH	分析纯	pH调整剂	MACKLIN., Shanghai
溴化钾	KBr	光谱纯	红外基底	MACKLIN., Shanghai
氯化钾	KCl	分析纯	电解质	MACKLIN., Shanghai

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表 3 BAPTA作用前后矿物表面元素含量及结合能分析

Table 3. Analysis of mineral surface element content and binding energy before and after BAPTA action

矿物	检测条件	元素含量/%(结合能/eV)
矿物	检测条件	C 1s	O 1s	Mg 1s	Ca 2p	N 1s
菱镁矿	自然条件	44.40 (284.80)	48.52 (531.38)	7.08(1304.43)	—	—
	pH 11.0、BAPTA 80 mg/L	45.27 (284.80)	47.61 (531.64)	7.01(1304.40)	—	0.11(402.02)
	偏差	0.87(0.00)	-0.91(0.26)	-0.07(-0.03)		0.11(402.02)
方解石	自然条件	41.92 (284.80)	50.76 (531.10)	—	9.32(347.46)	—
	pH 11.0、BAPTA 80 mg/L	45.80 (284.80)	44.31 (531.27)	—	6.18(347.93)	3.71(402.06)
	偏差	3.88(0.00)	-6.45(0.17)	—	-3.15(0.47)	3.71(402.06)
标注: “―”表示检测过程中元素含量低于0.10%的分析分辨率，无法通过试验检测发现。

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