CN1143611A - Method for producing iron oxide yellow using sulfuric acid roasting residue - Google Patents

Abstract

A process for producing ferrite yellow as pigment with waste dregs of sulfuric acid production includes producing ferrous sulfacte from said waste dregs and transforming the ferrous sulfate into ferrite yellow, and features low cost, high quality of product and reducing environmental pollution caused by the waste dregs.

Description

The method of producing iron oxide yellow using sulfuric acid roasting residue

The present invention relates to a kind of the utilization and produce the production method that the vitriolic waste residue is a fired slags manufacturing ferric oxide yellow pigment.

The method of traditional mode of production ferric oxide yellow pigment is to produce ferrous sulfate with iron filings and sulfuric acid reaction to make through oxidation again, and the waste residue in the production sulfuric acid process is thrown away as waste product always, cause environmental pollution, and the iron that contains about 30% in this fired slags slatterns thereupon also.

The objective of the invention is to invent a kind of method of utilizing sulfuric acid roasting residue to make ferric oxide yellow pigment.

This method is made up of the following step:

A: sulfuric acid roasting residue and 21～30% dilute sulphuric acids are inserted in the acid tolerance response cylinder react, produce ferrous sulfate, the quality proportioning is between the two:

Iron: sulfuric acid=56: 98

B: in above-mentioned solution, add an amount of iron filings and make whole ferric irons be reduced to ferrous iron;

C: B is gone on foot gained solution contract evaporation concentration to original volume 2/3, naturally cooling 24 hours then has a large amount of ferrous sulfate crystal to separate out.

D: the solution that ferrous sulfate is dissolved solid carbon dioxide preparation 40%, place the acid tolerance response bucket, 30% the solution that slowly adds while stirring that the sodium hydroxide that accounts for ferrous sulfate weight 7.2～9.5% is made into, disclose the bottom from reaction simultaneously and blast filtered air with gas blower, through 20～30 hours, get the outstanding dark liquid of iron oxide yellow crystal seed.

E: above-mentioned iron oxide yellow crystal seed is added in the acid tolerance response cylinder, heat to 75～85 ℃ with steam, atmospheric oxidation behind the feeding filtration, purification slowly drips 30% sodium hydroxide solution simultaneously, exists until no ferrous ion.

F: above-mentioned solution is precipitated, and rinsing is dried to PH=7, the levigate finished product that gets.

Advantage of the present invention is the pollution problem that has solved sulfuric acid roasting residue, and production cost is low, saves a large amount of scrap iron.

Embodiment: accurately measure the iron-holder in the fired slags earlier, undertaken by following step then;

A: in iron: sulfuric acid=56: 98 ratio is inserted fired slags and dilute sulphuric acid (21～30%) in the reaction cylinder and is reacted.

B: in above-mentioned solution, add an amount of iron filings and make whole ferric iron reduction (available potassium sulfocyanate test).

C: evaporation concentration solution cooled off 24 hours to original volume 2/3.

D: ferrous sulfate is dissolved in water prepares 40% solution, place the acid tolerance response bucket, 30% the solution that slowly adds while stirring that the sodium hydroxide that accounts for ferrous sulfate weight 7.2～9.5% is made into, blast filtered air from the reaction container bottom with gas blower simultaneously, through 20～30 hours, get iron oxide yellow crystal seed suspension.

E: above-mentioned iron oxide yellow crystal seed is added in the acid tolerance response cylinder, heat to 75～85 ℃ with steam, atmospheric oxidation behind the feeding filtration, purification slowly drips 30% sodium hydroxide solution simultaneously, exists until no ferrous ion.

F: above-mentioned solution is precipitated, and rinsing is to PH=7, oven dry, levigate finished product.

Claims (1)

1, a kind of method of producing iron oxide yellow using sulfuric acid roasting residue is characterized in that being made up of the following step:

A: sulfuric acid roasting residue and 21～30% dilute sulphuric acids are inserted in the acid tolerance response cylinder react, produce ferrous sulfate, the quality proportioning is between the two:

Iron: sulfuric acid=56: 98

B: in above-mentioned solution, add an amount of iron filings and make whole ferric irons be reduced to ferrous iron;

C: B is gone on foot gained solution contract evaporation concentration to original volume 2/3, naturally cooling 24 hours then has a large amount of ferrous sulfate crystal to separate out.

D: the solution that ferrous sulfate is dissolved in water preparation 40%, place the acid tolerance response bucket, 30% the solution that slowly adds while stirring that the sodium hydroxide that accounts for ferrous sulfate weight 7.2～9.5% is made into, disclose the bottom from reaction simultaneously and blast filtered air with gas blower, through 20～30 hours, get iron oxide yellow crystal seed suspension.

E: above-mentioned iron oxide yellow crystal seed is added in the acid tolerance response cylinder, heat to 75～85 ℃ with steam, atmospheric oxidation behind the feeding filtration, purification slowly drips 30% sodium hydroxide solution simultaneously, exists until no ferrous ion.

F: above-mentioned solution is precipitated, and rinsing is dried to PH=7, the levigate finished product that gets.