Products Description
The high-temperature desulfurization characteristics and microscopic reaction mechanism of calcium carbide slag and bauxite powder as coal additives were studied. It was found that when carbide slag and bauxite powder were added to coal at 1200℃, the low-temperature sulfur precipitation peak was almost the same as when only carbide slag was added, while the high-temperature sulfur precipitation peak was greatly reduced, thereby significantly increasing the desulfurization rate from 30.5% to 45.19%. XRD and SEM analysis showed that the CaO rich in carbide slag and the AlO rich in bauxite powder reacted with part of the CaSO generated during the coal solidification process at high temperature to form a heat-resistant phase "calcium sulfoaluminate", which is the main reason why calcium-aluminum-based additives have a higher desulfurization rate than pure calcium-based additives. In addition, bauxite powder enhances the melting degree of carbide slag coal solidification slag, so that the silicate melt has more opportunities to wrap CaSO and other solidification products to inhibit their high-temperature decomposition, which is another reason for its higher desulfurization rate.
Products parameters
| ITEM | INDEX | |||||
| Gas Yield 20°C 101.3 Kpa L/kg ≥ |
Size | Gas Yield | Size percentage | Ash,% | ||
| Top | A Grade | Accept Grade | ||||
| 80-120mm | 300 | 295 | 280 | ≥90 | ≤1 | |
| 50-80mm | 300 | 295 | 280 | ≥90 | ≤1 | |
| 25-50mm | 300 | 295 | 280 | ≥90 | ≤1 | |
| 15-25mm | 300 | 285 | 260 | ≥90 | ≤1 | |
| 7-15mm | 290 | 270 | 250 | ≥90 | ≤1 | |
| 4-7mm | 280 | 260 | 240 | ≥90 | ≤1 | |
| 2-4mm | 260 | 240 | 220 | ≥90 | ≤1 | |
Products cooperation picture
1.The calcium carbide slag was dissolved in ammonium chloride solution after pretreatment and prepared into ultrafine calcium carbonate by carbonization method. The influence of carbide slag pretreatment and other processes on the recovery rate of calcium carbonate was discussed. The process of circular preparation of calcium carbonate was explored, and the ammonia water and ammonium chloride produced by the reaction were recovered. The crystal form and properties of the synthesized calcium carbonate were tested by scanning electron microscopy and X-ray diffraction. The carbide slag was dried and dissolved in ammonium chloride solution with a mass fraction of 5% and an excess of 30%, and the recovery rate of calcium carbonate was 99.64%. The synthesized calcium carbonate is needle-shaped aragonite calcium carbonate.
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