Decanter centrifuge for mud treatment
The mechanical dewatering of sludge is an important condition for further disposal. If incineration or other heat treatment is used as the ultimate disposal method, the dewatering power of the decanter centrifuge is required to be as high as possible, because mechanical dewatering requires 1-2kwh of energy (electric energy) for each ton of water sludge disposal, and not only electric energy, and A lot of heat energy is needed for the evaporation of water.
In most cases, the increase in the rate of mechanical dehydration and dehydration is critical to the reduction of the subsequent disposal and disposal costs of sludge. The principle of separating sodium sulfate in the crystallization process is that the solubility of sodium sulfate in sodium thiocyanate solution is very low, and crystals are easy to form, so the concentrated sodium thiocyanate solution is settled through the settling tank to make sodium sulfate Grain gradually grows at the bottom of the settling tank (sodium sulfate content is about 13% to 15%).
The role of the decanter centrifuge is to separate the sodium sulfate crystals in the bottom solution (only a small part of them are beaten to evaporate the five effects as seed crystals). The resin is replaced and adsorbs sodium thiocyanate in between, and the waste liquid is discharged. If the separation effect of the centrifuge is not good, the content of sodium thiocyanate in the solid phase separator is too high, which exceeds the adsorption capacity of the sewage resin, and environmental protection requires that the content of sodium thiocyanate in the discharged sewage should not exceed 200ppm, the workshop has to Sodium thiocyanate with concentrated sodium sulfate is poured into the system and concentrated from the beginning to recover. The sodium sulfate content will accumulate in the system, which will eventually lead to unsteady production of the two systems of evaporation and crystallization, and then affect the normal production operation of the equipment.
Nearly 90% of sodium sulfate is separated from sodium thiocyanate in the crystallization separation step. The balance of sodium sulfate must be completed by the separation effect of the centrifuge, so in all recovery equipment, the decanter centrifuge plays a crucial role. The important role is to clean impurities and ensure the clean circulation of blood, just like a human kidney. The separation function of the centrifuge directly affects the smooth production and long-term operation of the entire workshop and even the whole plant.