HPF method is a commonly adopted desulphurisation technology in China, however, the sulphur produced by HPF method contains many impurities, which makes its sale and subsequent treatment quite tricky. As we know, ordinary sulphur is a ring structure composed of 8 sulphur atoms, which will open up when heated to form linear polymers with double free radical chain ends, i.e. insoluble sulphur, which includes two kinds of cas 9035 99 8 and CAS 7704-34-9.
For the desulphurisation sludge produced in coking plants, we use the extraction-crystallisation method for purification. In this process, the extractant we use consists of mixed xylene, flocculant and other components, which can effectively separate the sulfur in the desulfurisation waste residue from impurities such as residual carbon and tar, and the extractant can be recycled. After treatment, the residue can be mixed with coking coal and enter the coke oven again for utilisation. After the solvent evaporation, we will get high purity sulphur crystals which need to be dried in a blast drying oven for 1 hour to remove the solvent left on the surface of the crystals. The dried sulphur is then weighed, mixed with the appropriate amount of stabiliser and ground. Then, under the protection of nitrogen, we will heat the mixture to a predetermined temperature in a glass reactor and perform the full reaction according to the temperature and time set in the orthogonal table. At the end of the reaction, we quickly transfer the product to a cold water bath at 0°C for quenching and cooling. After 12 hours of curing, we will remove the water from the surface of the product at 40°C. After drying, the solid material will be processed by a crusher, then fully dissolved with carbon disulphide and filtered, and the resulting insoluble material is insoluble sulphur.
As a professional manufacturer of sulphur powder, we would like to warmly remind you to be careful in the process of using it.