New insights of inorganic phosphate inhibitors for flotation separation of calcium-bearing minerals

Abstract

In this paper, the inhibition ability of tetrasodium pyrophosphate (TSPP), sodium tripolyphosphate (STPP) and sodium hexametaphosphate (SHMP) to scheelite, fluorite and calcite was predicted by performance calculation and further verified by micro-flotation test. The results of hydrophile lipophilic balance (HLB) calculation, group electronegative calculation and micro-flotation test indicated that the inhibition ability of phosphate to the three minerals increases with the increase of the number of phosphate groups and the order of inhibition ability of the three inorganic phosphates was SHMP > STPP > TSPP. STPP had great potential for flotation separation of scheelite from fluorite and calcite. The order of inhibition ability of STPP against the three calcium-bearing minerals is calcite>fluorite>scheelite. The results of contact angle measurement, adsorption amount measurement, X-ray photoelectron spectroscopy (XPS) analysis and atomic force microscope (AFM) imaging presented that the adsorption of STPP on the fluorite and calcite surface was much larger than that on the scheelite surface. The weak adsorption of STPP on the scheelite hardly influenced the collection of sodium oleate (NaOL). STPP could complex with Ca²⁺ on the surface of fluorite and calcite, and hinder the subsequent adsorption of NaOL. The results can provide guiding significance for the flotation of scheelite and the screening of inhibitors for calcium-bearing gangue minerals.

Keywords

scheelite / fluorite / calcite / inorganic phosphate / flotation separation

References

[1] WangX, QinW-q, JiaoF, et al. . Review of tungsten resource reserves, tungsten concentrate production and tungsten beneficiation technology in China. Transactions of Nonferrous Metals Society of China, 2022, 32(7): 2318-2338 J]

[2] SunW-j, HanH-s, SunW, et al. . Novel insights into the mechanism of lime method based on calcium dioleate and mineral surface transformation. Journal of Central South University, 2023, 30(9): 2983-2992 J]

[3] ZhaoG, ZhouX-t, LiF-x, et al. . Flotation performance of anisic hydroxamic acid as new collector for tungsten and tin minerals. Journal of Central South University, 2022, 29(11): 3645-3655 J]

[4] JiaoF, LiW, WangX, et al. . Application of EDTMPS as a novel calcite depressant in scheelite flotation. International Journal of Mining Science and Technology, 2023, 33(5): 639-647 J]

[5] PanZ-c, ZhangY-s, HuJ-j, et al. . Camphor leaf extract as neoteric and environmentally friendly depressant in flotation separation of scheelite and calcite. Transactions of Nonferrous Metals Society of China, 2023, 33(1): 275-284 J]

[6] WangX, JiaW-h, YangC-r, et al. . Innovative application of sodium tripolyphosphate for the flotation separation of scheelite from calcite. Minerals Engineering, 2021, 170: 106981 J]

[7] WangX, JiaoF, QinW-q, et al. . Sulfonated brown coal: A novel depressant for the selective flotation of scheelite from calcite. Colloids and Surfaces A: Physicochemical and Engineering Aspects, 2020, 602125006 J]

[8] LiW, CuiY-f, PanZ-c, et al. . Hydrophobic agglomeration flotation of fine cassiterite induced by kerosene and sodium oleate. Powder Technology, 2024, 432119015 J]

[9] ChenW, FengQ-m, ZhangG-f, et al. . Investigations on flotation separation of scheelite from calcite by using a novel depressant: Sodium phytate. Minerals Engineering, 2018, 126116-122 J]

[10] LiuJ, WangX, ZhuY-m, et al. . Flotation separation of scheelite from fluorite by using DTPA as a depressant. Minerals Engineering, 2022, 175: 107311 J]

[11] ZhangC-h, HuY-h, SunW, et al. . Effect of phytic acid on the surface properties of scheelite and fluorite for their selective flotation. Colloids and Surfaces A: Physicochemical and Engineering Aspects, 2019, 57380-87 J]

[12] WangY-h, PanG-c, ChuH-r, et al. . Flotation separation of scheelite from calcite using sulfonated naphthalene-formaldehyde condensate as depressant. Minerals, 2022, 12(5): 517 J]

[13] DongL-y, JiaoF, QinW-q, et al. . New insights into the depressive mechanism of citric acid in the selective flotation of scheelite from fluorite. Minerals Engineering, 2021, 171: 107117 J]

[14] FuJ-h, HanH-s, WeiZ, et al. . Selective separation of scheelite from calcite using tartaric acid and Pb-BHA complexes. Colloids and Surfaces A: Physicochemical and Engineering Aspects, 2021, 622126657 J]

[15] DongL-y, JiaoF, QinW-q, et al. . Utilization of iron ions to improve the depressive efficiency of tartaric acid on the flotation separation of scheelite from calcite. Minerals Engineering, 2021, 168106925 J]

[16] DongL-y, QiaoL-d, ZhengQ-f, et al. . Enhanced adsorption of citric acid at the calcite surface by adding copper ions: Flotation separation of scheelite from calcite. Colloids and Surfaces A: Physicochemical and Engineering Aspects, 2023, 663131036 J]

[17] DongL-y, WeiQ, QinW-q, et al. . Effect of iron ions as assistant depressant of citric acid on the flotation separation of scheelite from calcite. Chemical Engineering Science, 2021, 241116720 J]

[18] DongL-y, JiaoF, QinW-q, et al. . Selective flotation of scheelite from calcite using xanthan gum as depressant. Minerals Engineering, 2019, 13814-23 J]

[19] JiaoF, DongL-y, QinW-q, et al. . Flotation separation of scheelite from calcite using pectin as depressant. Minerals Engineering, 2019, 136120-128 J]

[20] ChenC, SunW, ZhuH-l, et al. . A novel green depressant for flotation separation of scheelite from calcite. Transactions of Nonferrous Metals Society of China, 2021, 31(8): 2493-2500 J]

[21] DongL-y, JiaoF, QinW-q, et al. . New insights into the carboxymethyl cellulose adsorption on scheelite and calcite: Adsorption mechanism, AFM imaging and adsorption model. Applied Surface Science, 2019, 463: 105-114 J]

[22] WangJ-z, BaiJ-z, YinW-z, et al. . Flotation separation of scheelite from calcite using carboxyl methyl cellulose as depressant. Minerals Engineering, 2018, 127: 329-333 J]

[23] HuY-p, ZhangL, YiY-w, et al. . Effects of sodium hexametaphosphate, sodium tripolyphosphate and sodium pyrophosphate on the ultrastructure of beef myofibrillar proteins investigated with atomic force microscopy. Food Chemistry, 2021, 338: 128146 J]

[24] RashchiF, FinchJ A. Polyphosphates: A review their chemistry and application with particular reference to mineral processing. Minerals Engineering, 2000, 13(10–11): 1019-1035 J]

[25] GaoY-s, GaoZ-y, SunW, et al. . Adsorption of a novel reagent scheme on scheelite and calcite causing an effective flotation separation. Journal of Colloid and Interface Science, 2018, 51239-46 J]

[26] KangJ-h, KhosoS A, HuY-h, et al. . Utilisation of 1-Hydroxyethylidene-1, 1-diphosphonicacid as a selective depressant for the separation of scheelite from calcite and fluorite. Colloids and Surfaces A: Physicochemical and Engineering Aspects, 2019, 582: 123888 J]

[27] PanZ-c, WangY-f, WeiQ, et al. . Effect of sodium pyrophosphate on the flotation separation of calcite from apatite. Separation and Purification Technology, 2020, 242116408 J]

[28] FanC-y, RenL-y, ZhangY-m, et al. . Influence of sodium hexametaphosphate on muscovite grinding and its mechanism analysis. Minerals, 2023, 13(4): 457 J]

[29] LIU Xiao-yang, LIU Sheng-yu, FAN Min-qiang, et al. Decrease in hydrophilicity and moisture readsorption of Manglai lignite using lauryl polyoxyethylene ether: Effects of the HLB and coverage on functional groups and pores[J]. Fuel Processing Technology, 174: 33–34. DOI: https://doi.org/10.1016/j.fuproc.2018.02.010.

[30] ChenJ-h, LiY-q, LongQ-rong. Molecular structures and activity of organic depressants for marmatite, jamesonite and pyrite flotation. Transactions of Nonferrous Metals Society of China, 2010, 20101993-1999 J]

[31] YinW-z, WangJ-z, SunZ-mei. Structure-activity relationship and mechanisms of reagents used in scheelite flotation. Rare Metals, 2015, 34(12): 882-887 J]

[32] DongL-y, JiaoF, QinW-q, et al. . Effect of acidified water glass on the flotation separation of scheelite from calcite using mixed cationic/anionic collectors. Applied Surface Science, 2018, 444747-756 J]

[33] YaoW, LiM-l, ZhangM, et al. . Effect of Zn²⁺ and its addition sequence on flotation separation of scheelite from calcite using water glass. Colloids and Surfaces A: Physicochemical and Engineering Aspects, 2020, 588: 124394 J]

[34] FanC-y, RenL-y, ZhangY-m, et al. . Grinding effect of sodium silicate on muscovite and its mechanism analysis. Minerals Engineering, 2023, 199108106 J]

[35] WangR-l, SunW-j, HanH-s, et al. . Fluorite particles as a novel barite depressant in terms of surface transformation. Minerals Engineering, 2021, 166106877 J]

[36] ZhuH-y, YangB-q, FengJ-c, et al. . Evaluation of 1-hydroxyethylidene-1, 1-diphosphonic acid as an efficient and low-toxic sphalerite depressant in the selective flotation of galena from sphalerite. Journal of Cleaner Production, 2021, 329129612 J]

[37] WangR-k, LanZ-y, FengD-x, et al. . Heterocoagulation mechanism between galena and fine calcite minerals in flotation separation. Journal of Central South University, 2024, 31(1): 127-137 J]

[38] WeiQ, DongL-y, JiaoF, et al. . Selective flotation separation of fluorite from calcite by using sesbania gum as depressant. Minerals Engineering, 2021, 174107239 J]

[39] GaoZ-y, HuY-h, SunW, et al. . Surface-charge anisotropy of scheelite crystals. Langmuir: the ACS Journal of Surfaces and Colloids, 2016, 32(25): 6282-6288 J]

[40] GaoZ-y, LiC-w, SunW, et al. . Anisotropic surface properties of calcite: A consideration of surface broken bonds. Colloids and Surfaces A: Physicochemical and Engineering Aspects, 2017, 52053-61 J]

[41] GaoZ-y, SunW, HuY-hua. New insights into the dodecylamine adsorption on scheelite and calcite: An adsorption model. Minerals Engineering, 2015, 79: 54-61 J]

[42] JiangW, GaoZ-y, KhosoS A, et al. . Selective adsorption of benzhydroxamic acid on fluorite rendering selective separation of fluorite/calcite. Applied Surface Science, 2018, 435: 752-758 J]

[43] GaoZ-y, FanR-y, RalstonJ, et al. . Surface broken bonds: An efficient way to assess the surface behaviour of fluorite. Minerals Engineering, 2019, 130: 15-23 J]

[44] ZhengR-j, RenZ-j, GaoH-m, et al. . Effects of crystal chemistry on sodium oleate adsorption on fluorite surface investigated by molecular dynamics simulation. Minerals Engineering, 2018, 124: 77-85 J]