不同矿浆温度下Ca<sup>2+</sup>、Mg<sup>2+</sup>对黄铁矿可浮性的影响

王鑫; 何廷树; 鱼博; 贺寒冰; 王宇斌

doi:10.3969/j.issn.1000-6532.2024.03.019

不同矿浆温度下Ca²⁺、Mg²⁺对黄铁矿可浮性的影响

西安建筑科技大学资源工程学院，陕西　西安　710055

基金项目: 国家自然科学基金资助项目(51674184)

详细信息

作者简介: 王鑫（1997-），女，硕士研究生，主要从事矿物综合利用研究

通讯作者: 何廷树（1965-），男，博士，教授，主要从事矿物分离科学与工程研究

中图分类号: TD97;TD912

收稿日期: 2022-08-30

刊出日期: 2024-06-25

Influence of Ca²⁺ and Mg²⁺ on Pyrite Flotation at Different Slurry Temperatures

School of Resources Engineering, Xi’an University of Architecture and Technology, Xi’an 710055, Shaanxi, China

More Information

Corresponding author: HE Tingshu

Received Date: 30 August 2022

Publish Date: 25 June 2024

摘要

摘要:
这是一篇矿物加工工程领域的论文。通过单矿物浮选实验、浮选溶液化学、Zeta电位、XPS，研究了不同矿浆温度下Ca²⁺、Mg²⁺对黄铁矿浮选效果的影响机理，结果表明：低温能够明显抑制黄铁矿的浮选，且温度降低能够明显弱化Ca²⁺、Mg²⁺对黄铁矿浮选的抑制作用。当矿浆温度从20 ℃降至5 ℃时，矿浆中带电粒子运动速度减慢，Zeta电位增大，生成氢氧化钙镁沉淀的临界pH值增大，纯水矿浆中黄铁矿表面的FeO/OH的比例减小，Ca²⁺、Mg²⁺矿浆中黄铁矿表面FeO/OH含量的降低幅度减小，减少了黄铁矿表面的氧化程度和活性吸附位点，减少了Ca²⁺、Ca(OH)⁺, Mg²⁺和Mg(OH)⁺等离子在黄铁矿表面的吸附；但低温并不改变Ca²⁺、Mg²⁺在黄铁矿表面的存在形式和吸附状态，pH值为9时，钙镁均以Ca²⁺、Ca(OH)⁺、Mg²⁺、Mg(OH)⁺的形式存在并吸附在黄铁矿表面。
- 矿物加工工程 /
- 钙离子 /
- 镁离子 /
- 黄铁矿 /
- 低温 /
- 浮选
Abstract:
This is an article in the field of mineral processing engineering. Through single mineral flotation test, solution chemistry calculation, Zeta potential detection, XPS detection, the influence and regulation mechanism of Ca²⁺ and Mg²⁺ on the flotation of pyrite at different slurry temperatures was studied. The results showed that the low temperature could significantly inhibit the flotation of pyrite, and also could weaken the inhibitory effect of Ca²⁺ and Mg²⁺ on the flotation of pyrite. When the slurry temperature dropped from 20 ℃ to 5 ℃, the speed of movement of the charged particles slowed down, the Zeta potential and the critical pH value for the formation of calcium and magnesium hydroxide increased , and the proportion of FeO/OH on the pyrite surface in pyrite pulp decreased , decreasing the reduction rate of FeO/OH content on the pyrite surface in Ca²⁺ and Mg²⁺ pulp, reducing the oxidation sites on the pyrite surface, reducing the adsorption of Ca²⁺, Ca(OH)⁺, Mg²⁺and Mg(OH)⁺on the pyrite surface. However, the low temperature did not change the existence form and adsorption state of Ca²⁺ and Mg²⁺ on the pyrite surface. When the pH value was 9, the calcium and magnesium were adsorbed on the pyrite surface in the form of Ca²⁺, Ca(OH)⁺, Mg²⁺and Mg(OH)⁺.
- Mineral processing engineering /
- Ca²⁺ /
- Mg²⁺ /
- Pyrite /
- Low temperature /
- Flotation

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图 1 黄铁矿纯矿物XRD

Figure 1.

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图 2 单矿物浮选流程

Figure 2.

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图 3 不同矿浆温度下pH值对黄铁矿浮选效果的影响

Figure 3.

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图 4 不同矿浆温度下Ca²⁺、Mg²⁺离子浓度对黄铁矿浮选回收率的影响

Figure 4.

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图 5 不同矿浆温度下Ca²⁺溶液各组分lgC-pH

Figure 5.

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图 6 不同矿浆温度下Mg²⁺溶液各组分lgC-pH

Figure 6.

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图 7 不同矿浆温度下黄铁矿表面 Zeta 电位

Figure 7.

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图 8 黄铁矿的XPS

Figure 8.

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图 9 Fe2p的高分辨扫描XPS及分峰拟合

Figure 9.

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表 1 黄铁矿表面Ca、Mg原子相对百分含量

Table 1. Relative content of atoms of Ca and Mg on pyrite surface

序号	温度/℃	Ca²⁺ 浓度/ (mg/L)	Mg²⁺浓度/ (mg/L)	相对含量/%
序号	温度/℃	Ca²⁺ 浓度/ (mg/L)	Mg²⁺浓度/ (mg/L)	Ca	Mg
1	20	0	0	-	-
2	20	50	0	0.48	-
3	20	0	50	-	0.27
4	5	0	0	-	-
5	5	50	0	0.33	-
6	5	0	50	-	0.17

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表 2 Fe的价键形态及分峰拟合分布比例

Table 2. Distribution ratio of each sub-peak fitting form of Fe

序号	温度/℃	Ca²⁺ 浓度/ (mg/L)	Mg²⁺ 浓度/ (mg/L)	FeS₂ 区间能/eV	FeO/OH 区间能/eV	相对含量 FeS₂/%	相对含量 FeO/OH /%
1	20	0	0	707.48	711.51	61.14	38.86
2	20	50	0	707.33	711.41	79.60	20.40
3	20	0	50	707.42	711.07	74.41	25.59
4	5	0	0	706.93	711.64	67.21	32.79
5	5	50	0	707.05	711.54	68.72	31.28
6	5	0	50	707.03	711.43	71.70	28.30

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