Method of making pellets from ores and concentrates of ferrous metals

FIELD: metallurgy.

SUBSTANCE: proposed method comprises mixing polydisperse ores of ferrous metals and/or concentrates of ferrous metal ores with binder and mix pelletising at pressure. Note here that said binder represents solution of carboxymethyl cellulose of 1-3 wt % concentration in amount sufficient to get mix with moisture content of 7-14% and with addition of bentonite in amount of 0.2-1% of polydisperse material weight. Obtained pellets are roasted at 900-1300°C.

EFFECT: simplified process, higher strength, water resistance and dilution.

2 cl, 4 ex

 

The invention relates to the preparation of metal-containing raw materials for metallurgical processing, in particular to the briquetting ores and concentrates of ferrous metal ores.

Known "Method of agglomeration of fine iron-bearing materials for refining organic binder (patent RU No. 2272848, publ. 27.03.2006), in which acycolivr shredded ferrous materials. As the iron-containing material used iron ore concentrate, iron ore, tailings, metallurgical production, crushed slag, and other fine iron-containing materials. At least one iron-containing material and a binder are mixed, carry out the aggregation of the mixture and hardening the obtained aggregates. The binder material used is a synthetic copolymer of acrylamide and sodium acrylate in which the mole fraction of sodium acrylate may be from 0.5 to 99.5%, a molecular weight in the range of 1·104up to 2·107. Dosage of synthetic copolymer of acrylamide and sodium acrylate is from 0.02 to 0.10 kg per tonne of iron-bearing material. Copolymer of acrylamide and sodium acrylate can be used in the form of powder, solution, emulsion, suspension, or aerosol, in pure form or mixed with additional material is.

The disadvantages of the method are the difficulty of obtaining koskovich materials and the relatively high cost of the resulting product.

Known "Method of producing briquettes from fine metal oxides" (patent RU №2198940, publ. 20.02.2003)in which to obtain briquettes for recovery heat treatment in a gas atmosphere to produce a mixture of metal oxides with an aqueous solution of liquid glass and hydrophobic liquid hydrocarbons with a boiling point above 300°C and subsequent pressing.

The disadvantages of the method are the complexity of its implementation, ore briquettes on the content of useful components.

Known "Method of producing briquettes (patent RU No. 2203334 published 27.04.2003)adopted for the prototype, including a mixture of fine-grained polydisperse material with liquid glass and briquetting the mixture under pressure, characterized in that the mixture is served hot fine polydisperse material and heated or not heated liquid glass, after mixing the mixture before briquetting stirred conditions that ensure the evaporation of moisture from the surface and cooling it to a predetermined temperature.

The disadvantages of the method lies in the sophisticated technology of their production, the relatively low strength of the briquettes and their resubordinate useful for the y component.

The technical result of the invention is the simplification of the manufacture of briquettes at higher strength, moisture resistance of the briquettes and reduce dilution by the metal briquette.

The technical result is achieved in that in the method for producing briquettes, comprising a mixture of polydisperse material with a binder, briquetting the mixture under pressure as polydisperse polydisperse material used ores of ferrous metals and/or concentrates of ferrous metal ores, and as the binder used solution of carboxymethyl cellulose with a concentration of 1-3 wt.% and in an amount to provide a mixture with a moisture content 7-14%, with the addition of bentonite in the amount of 0.2-1% by weight polydisperse material.

These briquettes can be calcined at a temperature of 900-1300°C.

Use as a binder solution of carboxymethyl cellulose with a concentration of 1-3 wt.% and in an amount to provide a mixture with a moisture content 7-14%, with the addition of bentonite in the amount of 0.2-1% by weight polydisperse material provides robust and little razboieni content of useful component (metal) briquettes. The use of carboxymethyl cellulose with a concentration of less than 1 wt.% leads to a decrease in the strength of the briquettes, the concentration above 3 wt.% does not increase the strength of the briquettes. STA is in bentonite less than 0.2% leads to a decrease in the strength of the briquette, the number of more than 1% does not increase the strength of the briquette, and the content of useful component in the briquettes is reduced.

Humidity briquetted mixture in the range of 7-14% promotes uniform mixing of all components, the formation of strong structural connections and the best of forming briquettes, which increases the strength of the briquettes. The moisture content of the mixture is less than 7% impedes mixing of the components of the mixture, the moisture content of the mixture over 14% of excess reduces the formability of the mixture, reduces the strength of the briquettes.

The burning of the briquettes at a temperature of 900-1300°C produces a very durable and moisture-resistant briquettes. Firing at a temperature less than 900°C can significantly increase the strength and resistance of the briquettes. Firing at a temperature of more than 1300°C does not improve the strength and water resistance of the briquettes.

The method is as follows. Destroyed polydisperse ores of ferrous metals and/or concentrates of ferrous metal ores mixed with bentonite in the amount of 0.2-1% by weight polydisperse material in a standard mixer, for example, a drum. The solution of carboxymethylcellulose receive, for example, in a paddle mixer. The resulting mixture was again mixed with a solution of carboxymethyl cellulose with a concentration of 1-3 wt.% and in an amount to provide a mixture with a moisture content of 7-14% in drum or teelichthalter. Next, the obtained mixture is formed on the roller press under the pressure of 40-45 MPa briquettes, which are then heated to remove moisture or calcined at a temperature of 900-1300°C.

Example 1. Briquettes were made from meticulou ore particle size -10+0mm, spanning a 1.2% solution of carboxymethyl cellulose and 0.2% bentonite. The average humidity of briquetted mixture of 8%, a pressure of 40.0 MPa. Thus obtained pellets with an average uniaxial compressive strength of 6.9 MPa.

Briquettes were made from meticulou ore particle size -10+0mm, spanning a 1.2% solution of carboxymethylcellulose and 0.6% of bentonite, the average humidity of briquetted mixture of 7.8%; the pressure of 41.0 MPa. Thus obtained pellets with an average uniaxial compressive strength of 7.7 MPa.

Briquettes were made from meticulou ore particle size -10+0mm; connecting a 1.2% solution of carboxymethyl cellulose and 1.0% bentonite; average humidity of briquetted mixture of 10.2%; the pressure of 41.0 MPa. Thus obtained pellets with an average uniaxial compressive strength of 9.4 MPa.

Briquettes were made from meticulou ore particle size -10+0mm; binder 2,3% solution of carboxymethyl cellulose and 0.5% bentonite; average moisture content of the briquette of 9.5%; the pressure of 41.0 MPa. Thus obtained pellets with an average uniaxial compressive strength of 9.5 MPa.

Example 2. Briquettes were made from extracted-GI is regenative ore (-10+0 mm). Binder 1.5% solution of carboxymethylcellulose and 0.4% bentonite; average humidity of briquetted mixture of 12.2%; the pressure of 40.0 MPa. Thus obtained pellets with an average uniaxial compressive strength of 11.1 MPa.

Briquettes were made from extracted-hydrogenative ore (-10+0 mm). Connecting a 3.0% solution of carboxymethylcellulose and 0.4% bentonite; average humidity of briquetted mixture of 10.0%; pressure 40,0 MPa. Thus obtained pellets with an average uniaxial compressive strength of 11.2 MPa.

Example 3. Briquettes were made from extracted-hydrogenative ore (-10+0 mm). Binder 1.5% solution of carboxymethylcellulose and 0.4% bentonite; average humidity of briquetted mixture of 10.1%; the pressure of 41.0 MPa. Briquettes are burnt. When the firing temperature of 900°With the uniaxial compressive strength of 28.6 MPa, 1000°C - 34.8 MPa, 1100°C - 39,3 MPa, 1200°C - 43,9 MPa, 1300°C - 42,4 MPa. The briquettes are not destroyed after a one-night stay in the water.

Example 4. The briquettes were produced from chromite concentrate size -3+0 mm Binder 1,2% solution of carboxymethylcellulose and 0.4% bentonite; average humidity of briquetted mixture of 9.3%; the pressure 44.5 MPa. Thus obtained pellets with an average uniaxial compressive strength of 6.1 MPa.

The briquettes were produced from chromite concentrates size -3+0 mm Binder 1,2% solution of carboxymethyl cellulose is 0.6% of bentonite; the average humidity of briquetted mixture of 9.8%; the pressure to 44.8 MPa. Thus obtained pellets with an average uniaxial compressive strength of 7.2 MPa.

In the manufacture of briquettes from meticulou ore with iron content of 65 wt.%, ore metal (reduction of its content in the briquette) was as follows: when the amount of bentonite and 1% 0,65%; when the amount of bentonite and 0.6% 0,39%; when the amount of bentonite by 0.4% 0,26% and when the amount of bentonite 0,2% to 0.13%.

The reduction of iron content in the briquette due to the addition of carboxymethylcellulose insignificant as carboxymethylcellulose fade during metallurgical processing briquettes.

Thus, the method allows to obtain a durable and moisture-resistant briquettes for the simple technology of manufacturing briquettes at lower dilution by the metal briquette.

1. The method for producing briquettes from ores and/or concentrates of ferrous metal ores, comprising a polydisperse mixture of ferrous metal ores and/or concentrates, ores of ferrous metals with a binder and briquetting the mixture under pressure while in use as a binder solution of carboxymethyl cellulose with a concentration of 1-3 wt.% in an amount to provide a mixture with a moisture content 7-14%, with the addition of bentonite in the amount of 0.2-1% by weight polydisperse material.

2. The method according to claim 1, characterized in that the b is iKey calcined at a temperature of 900-1300°C.



 

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