Patent ID: 8568670
Filing Date: 2013-10-29
Classification: C01G,C22B,Y02P

Abstract:
1. A process for producing basic lead carbonate from redundant slag obtained from refining crude bismuth and neutralizing slag, the process comprising the following steps of: (1) immersing the neutralizing slag in water to obtain sodium hydroxide solution as a supernatant liquor; (2) leaching the redundant slag in an aqueous solution of sodium chloride having a concentration of 300-400 Kg/m (3) alkali neutralizing, filtering and washing the final lead chloride by washing, 3-6 times, with the supernatant liquor to form a filter slag; and (4) carbonate converting the filter slag by charging into clean water containing an amount of ammonium bicarbonate 2-3 times of a theoretical amount of ammonium bicarbonate required by the filter slag, and using sufficient supernatant liquor to adjust pH to 8-11 and stirring for 1-2 h to obtain a basic lead carbonate, and then crystallizing and precipitating, filtering, and washing the basic lead carbonate.