Method by utilizing sulfuric-acid residue to produce iron concentrates

Abstract

The invention discloses a method by utilizing sulfuric-acid residue to produce iron concentrates, which is characterized in that: techniques such as milling grinding, acid cleaning, activation, dispersion and floatation are adopted to remove harmful elements in the sulfuric-acid residue, the grade of iron is improved and the iron concentrates are obtained. The method concretely comprises the following working flows: the sulfuric-acid residue is put in wet grinding equipment for milling grinding, the granularity of the sulfuric-acid residue is ground to that 90 percent of the sulfuric-acid residue can pass through a 200-mesh sieve, and the milling grinding concentration is 60 to 75 percent; the sulfuric-acid residue after being ground is cleaned with 98% concentrated sulfuric acid, consumed volume of the sulfuric acid is 7.0 to 85kg / t, and the sulfuric-acid residue is mixed for 20 to 30 minutes; activating agent with the volume of 500 to 700g / t is added, and dispersant with volume of 200 to 300g / t is added to be mixed for 2 to 5 minutes; foamer with the volume of 50 to 100 g / t is added to be mixed for 2 to 5 minutes; 350 to 500g / t of xanthate collector is added to be mixed for 2 to5 minutes; the sulfuric-acid residue which is mixed with chemicals is delivered to a floatation machine, the floatation concentration is 20 to 30 percent, the floatation time is 30 to 45 minutes, andthen the iron concentrates can be produced. Compared with the process flow of the chemical method, the method is simpler and more convenient, and the sulfuric-acid residue with iron content being less than 55 percent can be processed.

Description

technical field [0001] The invention belongs to the technical field of iron fine powder production, and in particular relates to a method for producing iron fine powder by utilizing sulfuric acid slag, in particular to a method for producing iron fine powder by utilizing sulfuric acid slag by combining a chemical method and a flotation method. Background technique [0002] In the prior art, the method for producing iron concentrate powder from sulfuric acid slag generally adopts re-roasting-magnetic separation-gravity separation process, or magnetic separation-gravity separation combined-flotation and other technological processes for separation. However, after the sulfuric acid slag is roasted at high temperature, the magnetite and gangue in the slag mostly exist in the form of conjoined bodies, so it is difficult to obtain an ideal separation effect by conventional methods. The technical scheme disclosed in the Chinese patent (200510093037) "Method for Flotating Iron Conce...

AI Technical Summary

Problems solved by technology

However, after the sulfuric acid slag is roasted at high temperature, the magnetite and gangue in the slag mostly exist in the form of conjoined bodies, so it is difficult to obtain the ideal separation effect by conventional methods.

The technical scheme disclosed in the Chinese patent (200510093037) "Method for Flotating Iron Concentrates from Sulfuric Acid Slag" published on February 8, 2006 is to "separate the sulfides and gangues" first, but after being treated by this method, the sulfuric acid The slag grade is not high, only part of sulfide and gangue can be removed, and other harmful elements such as arsenic, copper and phosphorus cannot be removed

Extensive use of acidic media requires high material requirements for production equipment, large investment, and does not consider the treatment of harmful elements such as arsenic and copper.

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