Method for directly purifying and removing thallium from sulfur-containing flue gas

• Main Authors: YANG XIAOWU, JIN SHENGLONG, ZHANG YU
• Format: Patent
• Language: Chinese; English
• Published: 30.08.2024
• Subjects: CHEMISTRY; METALLURGY; PERFORMING OPERATIONS; PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL; SEPARATION; TRANSPORTING; TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE

The invention discloses a method for directly purifying and removing thallium from sulfur-containing flue gas, which comprises the following steps: the sulfur-containing flue gas is purified by a one-stage or multi-stage liquid caustic soda washing tower, and the sulfur-containing flue gas is in countercurrent contact with circulating spray liquid in the liquid caustic soda washing tower, so that SO2, thallium, lead and the like in the sulfur-containing flue gas are washed and enter the circulating spray liquid; circulating spraying liquid containing sulfur, thallium and lead elements and purified flue gas are obtained; adding a thallium removal stabilizer into the partial open-circuit circulating spray liquid containing the elements of sulfur, thallium and lead to carry out primary heavy removal treatment, then adding a thallium removal flocculant to carry out secondary heavy removal treatment, and finally carrying out filter pressing to obtain filtrate and filter residues containing the elements of thallium