A kind of processing and recycling method of jarosite slag
A jarosite slag and recycling technology, which is applied in the direction of improving process efficiency and reducing gas emissions, can solve the problems of no breakthrough, difficult separation, and affecting the reuse of leachate, and achieve high-efficiency treatment and recycling, low-energy consumption effect
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Embodiment 1
[0027] Add jarosite slag and medium (solid-to-liquid ratio (jarosite slag quality and leachate volume) that are crushed and ground to a particle size below 150 microns (crossing a 100 mesh sieve) and controlled at 5 to 100g / L), the medium volume accounts for 80% of the volume of the column container. Nitrogen gas was blown in for 30 minutes, and then the container was sealed, and the excess nitrogen gas on the headspace of the closed container was sucked out by a vacuum pump (the vacuum pump was pumped to -0.1 MPa). The medium used consists of (unit: mg / L): (NH 4 ) 2 SO 4 , 132; K 2 HPO 4 , 41; MgSO 4 ·7H 2 O, 490; CaCl 2 2H 2 O, 9; KCl, 52; ZnSO 4 ·7H 2 O, 1; CuSO 4 ·5H 2 O,2;MnSO 4 ·H 2 O, 1; NaMoO 4 ·5H 2 O, 0.5; CoCl 2 ·6H 2 O, 0.5; Na 2 SeO 4 10H 2 O, 1; NiCl 2 ·6H 2O, 1, balance water.
[0028] Control the temperature of the culture medium in the airtight column container to 30°C by a circulating water bath, and then inoculate Acidithiobacillus fe...
Embodiment 2
[0033] Using the same conditions as in Example 1, 0.3, 0.4, 0.5, 0.6, 0.7, 1.0, 2.0 g / L were used as critical concentrations of ferrous ions, respectively (see Table 1 for details).
[0034] Table 1 Example 2 Operation Table
[0035]
[0036] As can be seen from the data in Table 1, when the critical concentration of ferrous ions is set at 0.3, 0.4, 0.5, 0.6, 0.7, 1.0, 2.0g / L, the consumption time of the sequencing batch mode is 2, 3, 5, 7, 10, 13, and 18 days; the subsequent continuous flow mode operation conditions are: unstable, unstable, stable, stable, stable, stable, stable. Due to the concentration of 0.5g / L, the consumption time of the sequencing batch mode can be 5 days, and the subsequent continuous operation can be stable. Therefore, 0.5g / L is used as the critical concentration of ferrous ions.
Embodiment 3
[0038] Using the same conditions as in Example 1, three conditions of pH values of 1.8, 2.0 and 2.2 were tested respectively (see Table 2 for specific data).
[0039] Table 2 Example 3 operation table
[0040]
[0041] From the data in Table 2, it can be seen that when the pH value of the leachate is 1.8, 2.0, and 2.2, the ferrous ion concentration reaches the critical concentration of 0.5g / L, and the time consumed by the sequencing batch mode is 4, 5, and 7 days respectively. ; The running conditions of the subsequent continuous flow mode are: unstable, stable, and stable. Since it takes 5 days for the ferrous ion concentration to reach the critical concentration of 0.5g / L at pH=2.0, and the subsequent stable operation, pH=2.0 is the preferred pH condition.
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