Influence of Mn2+ ions on depression of quartz and spessartine in gondite ore

Centro Federal de Educação Tecnológica de Minas Gerais - CEFET-MG, Departamento de Mineração e Construção Civil, Araxá - Minas Gerais - Brasil.Centro Federal de Educação Tecnológica de Minas GeraisBrasilAraxá, Minas Gerais, BrasilCentro Federal de Educação Tecnológica de Minas Gerais - CEFET-MG, Departamento de Mineração e Construção Civil, Araxá - Minas Gerais - Brasil.

http://orcid.org/0000-0003-2500-8415

Guilherme Henrique Gualandi Rodrigues ⁴ 4 guilhermegualandi@hotmail.com

Universidade Federal de Ouro Preto - UFOP, Escola de Minas, Departamento de Engenharia de Minas, Ouro Preto - Minas Gerais Brasil.Universidade Federal de Ouro PretoBrasilOuro Preto, Minas Gerais, BrasilUniversidade Federal de Ouro Preto - UFOP, Escola de Minas, Departamento de Engenharia de Minas, Ouro Preto - Minas Gerais Brasil.

http://orcid.org/0000-0003-0483-3694

Carlos Alberto Pereira ⁵ 5 pereiraufop@gmail.com

http://orcid.org/0000-0003-0510-0257

E-mails: 3 fabiojosearaxa@cefetmg.br

4 guilhermegualandi@hotmail.com

5 pereiraufop@gmail.com

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Figures | Tables

Figures (8)
Tables (2)

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Figure 1
Minerals recovery effect of sodium silicate (SS), sodium hexametaphosphate (SH), sodium fluorosilicate (SF) as a function of pH values. N = pH natural and without depressant (point X and Z for quartz and spessartine, respectively).

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Figure 2
Flotation recovery of minerals vs. depressant concentration. pH = 10.00 ± 0.15.

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Figure 3
Minerals flotation submitted to depressant after the Mn²⁺ conditioning. pH = 10.00 ± 0.15.

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Figure 4
Quartz zeta potential. Q + SS + Mn²⁺: (1st sodium silicate; 2nd MnCl2); Q + Mn²⁺ + SS: (1st MnCl₂; 2nd sodium silicate); Q + KNO₃: quartz conditioned with KNO₃ (10⁻³ mol/L); Q + SS: quartz; conditioned with sodium silicate.

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Figure 5
Spessartine zeta potential. SP: spessartine conditioned with KNO₃ (10⁻³ mol/L); SP+SS: spessartine conditioned with sodium silicate (80 mg/L); SP+SS+Mn2+: (1st sodium silicate; 2nd MnCl₂); SP+Mn²⁺+SS: (1st MnCl₂; 2nd sodium silicate).

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Figure 6
Infrared spectra and manganese species adsorbed on the quartz (pH 10.00 ± 0.15).

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Figure 7
Infrared spectra and manganese species adsorbed on the spessartine (pH 10.00 ± 0.15).

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Figure 8
Diagram of the log concentration of the Mn⁺⁺ cation with a concentration of 10-4 M. (Fuerstenau et al., 1985FUERSTENAU, M. C.; MILLER, J. D.; KUHN, M. C. Chemistry of flotation. New York: Society of Mining Engineers of the AIME, 1985. 177p.).

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Table 1
Conditions for researching the best quartz/spessartine depressant.

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Table 2
Contents and crystalline phases identified in the spessartine and quartz samples.

Figure 1 Minerals recovery effect of sodium silicate (SS), sodium hexametaphosphate (SH), sodium fluorosilicate (SF) as a function of pH values. N = pH natural and without depressant (point X and Z for quartz and spessartine, respectively).

Figure 2 Flotation recovery of minerals vs. depressant concentration. pH = 10.00 ± 0.15.

Figure 3 Minerals flotation submitted to depressant after the Mn²⁺ conditioning. pH = 10.00 ± 0.15.

Figure 4 Quartz zeta potential. Q + SS + Mn²⁺: (1st sodium silicate; 2nd MnCl2); Q + Mn²⁺ + SS: (1st MnCl₂; 2nd sodium silicate); Q + KNO₃: quartz conditioned with KNO₃ (10⁻³ mol/L); Q + SS: quartz; conditioned with sodium silicate.

Figure 5 Spessartine zeta potential. SP: spessartine conditioned with KNO₃ (10⁻³ mol/L); SP+SS: spessartine conditioned with sodium silicate (80 mg/L); SP+SS+Mn2+: (1st sodium silicate; 2nd MnCl₂); SP+Mn²⁺+SS: (1st MnCl₂; 2nd sodium silicate).

Figure 6 Infrared spectra and manganese species adsorbed on the quartz (pH 10.00 ± 0.15).

Figure 7 Infrared spectra and manganese species adsorbed on the spessartine (pH 10.00 ± 0.15).

Figure 8 Diagram of the log concentration of the Mn⁺⁺ cation with a concentration of 10-4 M. (**Fuerstenau et al., 1985**FUERSTENAU, M. C.; MILLER, J. D.; KUHN, M. C. Chemistry of flotation. New York: Society of Mining Engineers of the AIME, 1985. 177p.).

Table 1 Conditions for researching the best quartz/spessartine depressant.

Depressant	Depressant concentration (mg/L)	pH
-	-	Natural ≈ 7.07
-	-	6; 8; 10
Sodium silicate	20; 40; 80	6; 8; 10
Sodium hexametaphosphate		6; 8; 10
Sodium fluorosilicate		6; 8; 10

Table 2 Contents and crystalline phases identified in the spessartine and quartz samples.

	Crystalline phases (%wt)			Contents (%)
Sample name	spessartine	quartz	enstatite	Mn	SiO₂	Al₂O₃	Fe₂O₃	P
spessartine	94.7	4.6	0.7	31.74	36.44	19.80	9.14	0.10
quartz	0.0	100.0	0.0	0.00	99.20	0.46	0.04	0.03

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Influence of Mn2+ ions on depression of quartz and spessartine in gondite ore

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[1] E-mails: 3 fabiojosearaxa@cefetmg.br