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Problems solved by technology
For example, CN1824372A mentions microwave catalytic flue gas desulfurization technology, which has higher desulfurization efficiency to simulated flue gas, but requires special equipment, and the gas after desulfurization still needs to be absorbed by dilute acid; Conducive to the smooth operation of continuous large-scale industrial production equipment
CN1883764A uses chemical manganese dioxide with high value itself, and electrolytic manganese dioxide is used for desulfurization treatment. The cost is high and the operation is complicated, which is not in line with China's national conditions. At the same time, the subsequent treatment of manganese sulfate solution produced by desulfurization is not involved.
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Embodiment 1
[0025] The sulfur-containing flue gas uses industrial-grade barium carbonate carbon to reduce the exhaust gas of the rotary kiln, with an average gas volume of 25000NM 3 / H, mean SO 2 Content 13400mg / m 3 , The outlet temperature of the cyclone dust collector is about 170°C.
[0026] A select wet base full manganese content 15% MnO 2 Mineral powder is processed by wet ball milling so that its fineness reaches 80 orders, and it is prepared with water to make a slurry with an initial solid-to-liquid ratio of 25% (percentage by weight);
[0027] B first pass the aforementioned sulfur-containing flue gas into the first stage of the absorption device, the superficial gas velocity is controlled at 1.5m / sec, and the liquid-gas circulation spray ratio (gas-liquid ratio) is 15L / m 3 or so, and then add the MnO prepared in step A to the third stage of the absorption device 2 Slurry, and control its reverse flow relative to the sulfur-containing flue gas. The three stages of the three-...
Embodiment 2
[0032] Except the selection of following parameters and steps, embodiment 2 adopts the same steps as embodiment 1 to obtain MnSO 4 ·H 2 O sample 2 # :
[0033] MnO 2 The total manganese content on wet basis is 9.10%, and it is processed by wet ball milling to make the fineness reach 100 mesh. The initial solid-liquid ratio of the slurry is 30%, and the liquid-gas circulation spray ratio is 17L / m 3 Around, the superficial velocity is 1.3m / sec, the third-stage outlet temperature is 70°C, and the third-stage outlet is SO 2 The content is 271-640mg / m 3 .
[0034] After five consecutive return operations, the mother liquor MnSO 4 The concentration is 289g / L, the obtained clear solution is adjusted to PH=4 with dilute sulfuric acid, and the temperature of the solution is controlled at 50°C; the obtained filter cake is stirred and washed with water at 60°C for 1.5 hours, and the ratio of material to water is controlled at 1:5, and the obtained mother liquor For the preparation o...
Embodiment 3
[0037] Except the selection of following parameters and steps, embodiment 3 adopts the same steps as embodiment 1 to obtain MnSO 4 ·H 2 O sample 3 # :
[0038] Sulfur-containing flue gas uses industrial strontium carbonate carbon to reduce rotary kiln exhaust gas, with an average gas volume of 17000NM 3 / H, mean SO 2 Content 11500mg / m 3 , The outlet temperature of the cyclone dust collector is 150°C.
[0039] MnO 2 The total manganese content on a wet basis is 14.22%, and it is processed by a wet rod mill. The initial solid-liquid ratio of the slurry is 28%, and the liquid-gas circulation spray ratio is 25L / m 3 Around, the superficial velocity is 1.7m / sec, the third-stage outlet temperature is 60°C, and the third-stage outlet is SO 2 The content is 114-322mg / m 3 .
[0040] After three return operations, the mother liquor MnSO 4 The concentration is 304g / L, the obtained clear solution is adjusted to PH=3.0, and the temperature of the solution is controlled to be 70°C;...
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Abstract
The invention discloses a method for preparing MnSO4.H2O by performing flue gas desulphurization on a medium-and-low-grade MnO2 ore, which comprises the steps of: preparing medium-and-low-grade MnO2 ore powder into slurry; aerating sulfur-bearing flue gas into an absorption device; controlling a gas velocity and a gas-liquid ratio; then adding the MnO2 slurry into the absorption device; controlling the Mn2O slurry to flow reversely relative to the sulfur-bearing flue gas; discharging desulfurized flue gas from the absorption device; filter-pressing and separating the slurry discharged from the absorption device; returning mother solution to the absorption device; continuing the returning operation until the [MnSO4.H2O] in the mother solution is more than or equal to 200 g / L; stirring and washing an obtained filter cake at the temperature of between 60 and 70 DEG C; regulating the pH value of settled solution obtained by filtering-pressing and separating to be between 2 and 4; adding manganous sulfide under stirring at the temperature of between 25 and 95 DEG C; filtering the mixture and removing impurities from the mixture; continuing stirring the mixture; filter-pressing and separating the mixture; evaporating the obtained settled solution; and drying by the air stream to obtain the MnSO4.H2O. The method improves desulphurization efficiency, reduces the production cost for the manganous sulfate, and improves the recovery rate of total manganese, thereby recycling valuable metals efficiently.
Description
technical field [0001] The invention relates to a method of utilizing low- and medium-grade MnO 2 Desulphurization of flue gas to produce MnSO 4 ·H 2 O's method. Background technique [0002] There have been many literatures and patent applications related to the research on the use of manganese dioxide in flue gas desulfurization. For example, CN1824372A mentions microwave catalytic flue gas desulfurization technology, which has higher desulfurization efficiency to simulated flue gas, but requires special equipment, and the gas after desulfurization still needs to be absorbed by dilute acid; It is beneficial to the smooth operation of continuous large-scale industrial production equipment. CN1883764A uses chemical manganese dioxide with high value itself, and electrolytic manganese dioxide is used for desulfurization treatment. The cost is high and the operation is complicated, which does not meet China's national conditions. At the same time, it does not involve the su...
Claims
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Application Information
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