A study on the dissolution rates of K-Cr(VI)-jarosites: kinetic analysis and implications

Reyes, Iván A.; Mireles, Ister; Patiño, Francisco; Pandiyan, Thangarasu; Flores, Mizraim U.; Palacios, Elia G.; Gutiérrez, Emmanuel J.; Reyes, Martín

doi:10.1186/s12932-016-0035-7

Geochemical Transactions

Table 2 Conditions and calculation results of the dissolution experiments of KFe₃[(SO₄)_2 − X(CrO₄)_X](OH)₆ in medium H₃O⁺, tr is the total reaction time of each experiment (until steady state is obtained)

From: A study on the dissolution rates of K-Cr(VI)-jarosites: kinetic analysis and implications

[HCl]/mol L⁻¹	pH	T/K	CrO₄/mol^a	[H₃O⁺]/mol L⁻¹	d₀/µm^b	t_ind/min	k_exp/min ⁻¹	t_r/min
0.50	0.28	323.15	0.77	0.5248	38	5.50	0.01070	50
0.30	0.50	323.15	0.77	0.3162	38	18.44	0.00830	130
0.10	0.95	323.15	0.77	0.1122	38	29.88	0.00177	420
0.07	1.13	323.15	0.77	0.0741	38	34.06	0.00097	520
0.04	1.42	323.15	0.77	0.0380	38	53.50	0.00048	750
0.01	2.01	323.15	0.77	0.0098	38	84.47	0.00010	1800
0.50	0.30	303.15	0.77	0.5012	38	75.70	0.00191	390
0.30	0.51	303.15	0.77	0.3090	38	148.58	0.00067	1320
0.10	0.99	303.15	0.77	0.1023	38	458.77	0.00027	2340
0.06	1.22	303.15	0.77	0.0603	38	1033.32	0.00015	10320
0.02	1.69	303.15	0.77	0.0204	38	2740.02	0.00005	13500
0.30	0.55	298.15	0.77	0.2818	38	191.25	0.0004	2280
0.30	0.55	308.15	0.77	0.2818	38	66.27	0.0011	1000
0.30	0.54	313.15	0.77	0.2884	38	36.58	0.0019	750
0.30	0.54	318.15	0.77	0.2884	38	19.00	0.0030	285
0.30	0.53	323.15	0.77	0.2951	38	8.69	0.0048	120
0.30	0.52	333.15	0.77	0.3020	38	2.52	0.0083	47
0.30	0.51	338.15	0.77	0.3090	38	1.41	0.0162	40
0.30	0.50	343.15	0.77	0.3162	38	0.61	0.0210	35
0.30	0.49	353.15	0.77	0.3236	38	0.25	0.0326	30
0.50	0.33	303.15	0.77	0.468	38	109.80	0.00193	390
0.50	0.31	313.15	0.77	0.490	38	29.56	0.00407	150
0.50	0.27	323.15	0.77	0.537	38	7.24	0.0143	50
0.50	0.25	333.15	0.77	0.562	38	1.98	0.0223	30
0.50	0.22	343.15	0.77	0.603	38	0.54	0.0651	12
0.50	0.21	353.15	0.77	0.617	38	0.21	0.1173	8
0.30	0.52	303.15	0.77	0.3020	25	18.13	0.0083	130
0.30	0.52	303.15	0.77	0.3020	38	18.44	0.0056	130
0.30	0.53	303.15	0.77	0.2951	44	20.83	0.0048	130
0.30	0.53	303.15	0.77	0.2951	53	17.64	0.0039	130
0.30	0.53	303.15	0.77	0.2951	75	15.21	0.0028	130
0.30	0.52	303.15	1.99	0.3020	38	5.61	0.0060	165
0.30	0.52	303.15	1.57	0.3020	38	5.23	0.0059	165
0.30	0.53	303.15	1.02	0.2951	38	5.70	0.0059	160
0.30	0.52	303.15	0.77	0.3020	38	4.94	0.0056	160
0.30	0.53	303.15	0.12	0.2951	38	6.04	0.0058	165
0.30	0.53	303.15	0.09	0.2951	38	8.56	0.0059	165
0.30	0.52	303.15	0.00	0.3020	38	6.58	0.0059	160

Italic data indicates conditions and results with change in the controlling stage (or resistance), passing from a process controlled by the chemical reaction to a process controlled by the mass transport in the ash layer
^aSO₄ ²⁻ + CrO₄ ²⁻ = 2
^bMesh diameter

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ISSN: 1467-4866

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