Method for phosphoric acid desulfurization by replacing phosphate concentrate with sludge residues

• Main Authors: HAN CHAOYING, PAN ZHENGZHOU, LIU YONGJUN, PAN LIFU, GUO JIAJUN, HUANG HE, ZHANG PIAN
• Format: Patent
• Language: Chinese; English
• Published: 09.02.2024
• Subjects: CHEMISTRY; COMPOUNDS THEREOF; INORGANIC CHEMISTRY; METALLURGY; NON-METALLIC ELEMENTS

The invention belongs to the technical field of wet-process phosphoric acid desulfurization, and particularly relates to a method for phosphoric acid desulfurization by replacing phosphate concentrate with sludge residues. The sludge slag is used as a desulfurizing agent, so that the desulfurization reaction time can be shortened, phosphorus in the sludge slag can be extracted into the slurry, waste is turned into wealth, the concentration of phosphoric acid is increased, and benefits are increased. The sludge residues are used for pretreatment and desulfurization, so that the energy consumption can be reduced, the production cost can be effectively controlled, the P2O5 content in the sludge residues reaches up to 27%, and the sludge residues can be recycled. The quality standard of the desulfurized phosphoric acid obtained by the method is as follows: the content of P2O5 is 50%, and the content of SO4 < 2-> is 0.29%. 本发明属于湿法磷酸脱硫技术领域，具体涉及一种污泥渣代替磷精矿磷酸脱硫的方法；本发明采用污泥渣作为脱硫剂，不仅能缩短脱硫反应时间，同时能将污泥渣中的磷提取至浆料中，变废为宝，增加磷酸浓度