Dry method includes metal antimony method and antimony method; wet method includes acid leaching method and antimony salt decomposition method. Dry metal antimony method (dry method). Reaction equation: Sb+O2→Sb2O3 Operation method: 700kg of 99.8% metal antimony (containing 29×10-6 sulfur) is heated to 1200℃ in a graphite furnace, and air is vented at 0.3m3/min for 5min, until the sulfur dioxide in the exhaust gas Content ≤ 5×10-6, cooled to 786 ℃, air was blown at a speed of 2m3/min for 12h, the yield of antimony white was 92.1%. Antimonite method (dry method). Reaction equation: 2Sb2S3+9O2→2Sb2O3+6SO2↑Sb2O3+3C→2Sb+3CO↑4Sb+O2→2Sb2O3 Operation method: choose high-grade antimonite containing Sb50%~60%, As0.1%, Pb0.007%, Fe0.16%, S11.42%, Al2O30.66%, CaO4.75%, MgO<0.5%, SiO28.65%, HgO0.0026%. This concentrate is mixed with iron ore (Fe50.17%) and 2% limestone (CaO>50%) accounting for 10% of the antimony concentrate, and added to the slag pool of the fuming furnace at a certain speed, and air, coal The powder mixture is used to adjust the temperature of the liquid slag and the atmosphere in the furnace to keep the temperature at about 1250 °C. The CO2/CO in the gas phase in the furnace is 4.78, 1gPO2=-8.33, and the charge is added to continuously melt. Antimony is mainly Sb2O3 and a small amount is sulfide. The form is continuously smoked into the gas phase. When purifying the flue gas, it is burned through the flue and combustion chamber, and the sulfide is converted into Sb2O3. The oxides in the flue gas are then collected in each section of the dust collection equipment. Among them, antimony oxide is collected by flue vortex, and the dust collected by electrostatic precipitator is of high purity, which can be used as antimony white. After adding the given charge, blow coal to continue melting and fuming for about 1 hour. When there is basically no white volatiles in the flue gas, the process ends and 2/3 of the slag is released. Acid leaching method (wet method). Reaction equation: Sb2S3+6HCl→2SbCl3+3H2S↑SbCl3+H2O→SbOCl+2HCl2SbOCl+2NH4OH→Sb2O3+NH4Cl+H2O Add acid-resistant leaching barrels one after another. The composition of the leaching solution is HCl 1.0mol/L, Fe2+70g/L (FeCl2 added), Sb3+4.2g/L, leaching solution: solid = 2:1, steam heated to 80 ℃, under mechanical stirring , leaching with chlorine gas for 6h. Filtration and purification to obtain a leaching solution containing Sb283g/L, hydrolyzed at room temperature, washed with water for several times by antimony oxychloride, neutralized with ammonia water for 30min, pH=8～9, washed to pH=7, filtered and dried to obtain antimony The white powder is 406kg, which contains 99.80% Sb2O3, the particle size is below 325 mesh, and the whiteness is 97%. Antimony salt decomposition method (wet method). Reaction equation: 2Sb+3Cl2→2SbCl3SbCl3+H2O→SbOCl+2HCl4SbOCl+H2O→Sb2O3 2SbOCl+2HClSb2O3 2SbOCl+2NH4OH→2Sb2O3+2NH4Cl+H2O Operation method: The metal antimony reacts with chlorine to generate antimony trichloride. Hydrolysis, ammonolysis, washing, centrifugation and drying are carried out to obtain the finished product of Diantimony Trioxide Formula.
