反应详情

温度

70 °C

A 60-liter capacity vessel equipped with a high-speed stirrer and filled with 40 l of water was charged with 17.532 Kg of powdery lead monoxide (PbO-DP) prepared according to the above-mentioned dry method, and the charges were stirred at a high speed to disperse the lead monoxide sufficiently and homogeneously in water and the dispersion was heated at 65° C. Then, 109 cc of an aqueous solution of acetic acid having a concentration of 2.7 moles per liter was added to the dispersion to convert a part of lead monoxide to lead acetate. Then, 2702.6 cc of an aqueous solution of sulfuric acid having a concentration of 7.0 moles per liter was dropped to the dispersion over a period of 40 minutes. Then, aging was carried out under agitation at 65° C. for 60 minutes to form a slurry of needle crystals of a polybasic lead sulfate. Separately, a 10-liter capacity vessel of stainless steel was charged with 5 l of water maintained at 70° C. and 558 g of stearic acid was dissolved in this water. Then, 24 cc of 7 N aqueous ammonia was added to the solution and sufficiently emulsified under agitation to form an ammonia soap liquid. The so formed ammonia soap liquid was poured into the above-mentioned polybasic lead sulfate slurry over a period of 10 minutes, and aging reaction was carried out under high-speed agitation at 65° C. for 20 minutes to enroll stearic acid into the crystals of the polybasic lead sulfate and form a polybasic sulfuric acid/fatty acid lead salt (TBLSS). The so formed TBLSS slurry was sufficiently dispersed, and after coarse granules had been removed by sieving, the slurry was granulated to spherical particles under drying in a spray-drying device.