Method for treating arsenic-containing waste polluted acid by using industrial iron-containing waste mud

Abstract

The invention belongs to the field of environmental protection, and particularly relates to a method for treating arsenic-containing waste polluted acid by using industrial iron-containing waste mud.The method comprises: pouring industrial iron-containing waste mud into arsenic-containing waste polluted acid, promoting the uniform mixing and the reaction between the industrial iron-containing waste mud and the arsenic-containing waste polluted acid through stirring or aeration, adjusting the pH value to 6-9 with an alkali, entering a precipitation pool, carrying out standard discharge on thesupernatant, dewatering the concentrated sludge by using a press filter or a centrifuge, and treating the dewatered concentrated sludge as solid waste. According to the present invention, the use amount of the industrial iron-containing waste mud is determined through the test according to the components and the treatment requirements of the arsenic-containing waste polluted acid; with the method,the iron-containing solid waste in the iron and steel industry and the aluminum industry can be directly utilized, and the arsenic-containing waste polluted acid problem generally existing in the non-ferrous smelting, the industrial sulfuric acid and other industries can be solved; and the method has advantages of simple process, easy operation, good arsenic removal effect, iron salt addition eliminating, alkali consumption reducing, effectively-reduced solid waste treatment pressure, resource saving, cost reducing and high practical value.

Description

technical field

[0001] The invention belongs to the field of environmental protection, and in particular relates to a method for treating arsenic-containing waste sewage acid by utilizing industrial iron-containing waste mud. Background technique

[0002] Iron and steel products usually need to be cleaned with strong acid (mainly hydrochloric acid, sulfuric acid, mixed acid, etc.) in the process of processing to remove the scale on the surface of the workpiece. When the iron ion in the acid solution reaches a certain concentration, it will cause its corrosion and cleaning effect to decline significantly, and finally become waste acid. According to statistics, the annual output of pickling waste acid in my country's iron and steel industry is more than 10 million tons, and an average of 1 ton of pickling waste acid is processed to produce 250-350 kg of iron-containing waste pickling sludge. Therefore, the annual production of iron-containing waste sludge in the pickling proc...