Method for preparing black iron oxide by utilizing yellow ammonium iron alum slag

Abstract

The invention provides a method for preparing black iron oxide by utilizing yellow ammonium iron alum slag. The method comprises the following basic steps: placing yellow ammonium iron alum slag in an oven for drying at the temperature of 100-150 DEG C for 1-3h; placing the dried yellow ammonium iron alum slag into a porcelain boat which is put into a tubular furnace, and conducting calcining treatment in N2 atmosphere at the calcining temperature of 900-1200 DEG C for 5-60 min; absorbing SO2 and SO3 contained in discharged waste gas using 5-30% ammonium hydrogen carbonate aqueous solution to obtain a by-product ammonium sulfate; and after cooling calcining slag in N2 atmosphere, placing the calcining slag in 3-20mol / L sodium hydroxide aqueous solution, mixing and reacting for 1-6h at the temperature of 100-200 DEG C, and obtaining a product with Fe3O4 content more than 90% by filtering, washing and drying, wherein the product reaches the standards of HG / T 2250-91 black iron oxide pigment. The method has the advantages of being short in production process and simple and convenient in operation, turning wastes into valuables, and having double benefits of environmental protection and economy.

Description

technical field [0001] The invention relates to the comprehensive utilization of industrial waste residues, and relates to a method for producing iron oxide black by using jarosite residues as raw materials. Background technique [0002] Iron oxide pigments are generally made of steel scraps and steel pickling waste as the main raw materials, and are manufactured by chemical synthesis. The products are non-toxic and pollution-free, and are widely used in coatings, paints, building materials, printing and dyeing, chemical synthesis raw materials, etc. , is a fine chemical product. Among the iron oxide pigments, iron oxide black accounts for about 20% of the market share and has broad application prospects. [0003] In the hydrometallurgical production process, the jarosite method for iron removal is widely used because of its easy precipitation, low solubility, good filterability, low reagent consumption and low production cost. But its main disadvantages are large amount o...

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Problems solved by technology

[0011] From the above search results, it is understood that the main introductions of the public documents are: Documents ①, ② and ③ use the roasting method to process the ferrite slag, which has the advantage of simple process, but the obtained iron series products have high impurity content and low iron content ; Documents ④, ⑤ and ⑥ use the wet method to process the ferrosite slag, which has the advantages of high product purity, fine particles and good dispersibility, but the process route is long and the production process is complicated