RU2638260C1 - Method for producing metallurgical briquette - Google Patents

Abstract

FIELD: metallurgy.

SUBSTANCE: invention describes the method for producing the metallurgical briquette and comprises mixing the raw materials-carbon-containing material, a binder and water, pressing the briquette mixture and drying the moulded briquette. As a binding agent, a two-component binder containing resin and flour in ratio from 0.5:1 to 2:1 is used, where the starting components are taken in the following ratio, wt %: carbon-containing material-at least 50; bicomponent binder-8-40; the rest is water with temperature from 1 to 99°C.

EFFECT: production of briquette having high strength and low water absorption.

3 cl, 3 ex

Description

The invention relates to the field of technology for the preparation and production of a briquette of carbon material used as a reducing agent in metallurgical processes, and also as smokeless fuel for domestic and industrial furnaces.

A known method for producing a briquette, comprising mixing crushed solid fuels with a binder based on oil refinery waste - oil sludge and / or used engine oil, briquetting the mixture and subsequent drying of the briquette. Additionally, components selected from the group comprising wt.% Based on the briquetted mixture are introduced into the binder: lignosulfonate or molasses - 2-7, and / or dehydrated activated sludge - 3-8, and / or clay - 3-10, and / or paraffin or paraffin wax 3-6% in the following ratio of components in the briquette, wt. %: binder - 10-23, crushed solid fuels selected from the group: sawdust, peat, dehydrated bird droppings, dehydrated manure, coke or coal fines, coal sludge, lignin or mixtures thereof - up to 100.

Briquetting is carried out at a pressure of 1-30 MPa, drying the briquette at a temperature of less than 300 ° C. Before mixing, the components of the binder are heated to 60-80 ° C or mixed with heating to 60-80 ° C. Solid fuel is pre-mixed with half of the sludge or processed engine oil and then the remaining components of the binder are added (RU 2130047, publ. 1999).

However, the briquettes obtained using the described known method have insufficient strength due to the inclusion in the raw materials, for example, sawdust, manure, bird droppings, and the inclusion in the composition of the binder clay can adversely change the composition of the mineral part of the briquette.

There is also known a method of producing briquette fuel, comprising mixing carbon-containing raw materials with a binder - a low-temperature semi-coking resin obtained at temperatures up to 650 °, pressing the mixture and subsequent curing of the briquettes in an oxidizing atmosphere at 150-300 ° C (RU 2375434, publ. 2009).

However, the briquettes obtained by the described method have insufficient strength.

The closest technical solution to the claimed method is a method for producing briquette fuel, which consists in co-grinding the carbon-containing material and mineral binder to a particle size of not more than 5 mm, adding to the resulting composition a water-repellent modifier and water, followed by mixing with the addition of a strengthening modifier.

The resulting mass is pressed into briquettes under a pressure of 20-200 MPa and the resulting briquettes are dried at 100-250 ° C.

Carbon-containing material is used as components - brown coal, medium temperature coke of initial particle size distribution, mineral binder - siltstone, reinforcing modifier - 3% aqueous solution of polyvinyl alcohol (PVA) or aqueous solution of 10% flour paste, water-repellent modifier - M100 brand fuel oil , water, with the following content of components, wt. %: mineral binder 1-10; hardening modifier 1-30; hydrophobizing modifier 1-10; water 3-30; carbon-containing material - the rest (RU 2473672, publ. 2013).

Briquettes obtained by the described method have insufficient strength and water resistance.

The technical task of the present invention is to obtain a briquette having high strength, providing the ability to repeatedly perform loading and unloading operations, low water absorption (high water resistance).

The specified technical problem is solved by the described method for producing a metallurgical briquette, including mixing the starting components, pressing the resulting mixture and drying, and the carbon-containing material, a binder, which is a mixture of resin and flour in a ratio of from 0.5: 1 to 2: 1, is used as starting components and water at the following content of components, wt.%:

carbon material not less than 50.0 binder 8.0-40.0 water rest

Preferably, the binder contains, as a resin, a heavy pyrolysis resin or a hardwood resin, and, as a flour, cereal flour.

The technical result when using the invention is to obtain briquettes with increased strength, providing the possibility of multiple loading and unloading operations, low water absorption (increased water resistance) and low content of impurities such as iron, titanium, aluminum, phosphorus, undesirable for silicon production processes in ore thermal furnaces.

The specified technical result is achieved by the fact that before mixing, if necessary, the carbon-containing material is crushed to a particle size of not more than 0.315 mm and / or subjected to magnetic separation with a magnitude of magnetic induction from 0.8 to 1.2 T.

With a low binder content, grinding the material has a beneficial effect on the strength of the briquette.

Further, in order to give the briquette high strength and water resistance, a two-component binder is added to the carbon-containing material, including resin and flour in a ratio of 0.5: 1 to 2: 1, in an amount of 8 to 40 wt. %, and water with a temperature of from 1 to 99 ° C. Then the resulting mass is stirred until a homogeneous state and briquetted with a force of 5 to 500 MPa.

The increased temperature of the added water has a beneficial effect on the strength of the briquette with a low binder content.

To obtain a briquette, carbon coke grade MK-1 (hereinafter referred to as MK-1), obtained by medium-temperature carbonization of brown coal, with an initial particle size distribution of 0-10 mm, is used as a carbon-containing material. As components of the binder, resin and flour are used. As water use industrial water.

The preparation of the briquette mixture is as follows.

After magnetic separation, the MK-1 non-magnetic fraction is fed to a runner-type mixer (batch action), then resin, flour and water are added sequentially. When adding each of the listed components, the mixture is stirred until homogeneous. Upon receipt of the resulting homogeneous composition, the mixture is unloaded from the mixer and fed into the roller press with a maximum roll force of 150 tf. Formed briquette is dried in a belt dryer at a temperature of 150 ° C to a moisture content (W _t ^r ) of less than 5%. The dried briquette is cooled at ambient temperature.

The invention is illustrated by the following examples.

Example 1. For the manufacture of the briquette using the following components: 100 parts by weight non-magnetic fraction of fines of coke grade MK-1 as a carbon-containing material, 7.5 parts by weight heavy grade A pyrolysis resins and 10 parts by weight barley flour as a binder, 25 parts by weight technical water with a temperature of at least 80 ° C.

The starting components are prepared as follows. The non-magnetic fraction of fines of coke grade MK-1 is obtained by magnetic separation of the original fines of coke grade MK-1 with a maximum magnetic induction of 1.2 T. Next, the coke breeze is loaded into a runner type mixer, heavy grade A pyrolysis resin, barley flour and water are added sequentially, and after adding each of the listed components, the mixture is mixed until it is homogeneous. The resulting briquette mixture is fed into a roller press with a maximum roll force of 150 tf. The briquette is dried at a temperature of 150 ° C for 1 h. The dried briquette is cooled at ambient temperature.

The resulting briquette has a dropping strength of more than 95%, abrasion resistance in the drum of more than 92%, moisture content of less than 5%, ash content of less than 8%, the yield of volatile dry spineless mass of less than 20%, water absorption of less than 6%, the content of oxide on the working mass iron less than 0.2%, oxides of aluminum, titanium and phosphorus - less than 0.4% (each).

Example 2

The briquette is made in accordance with Example 1, but heavy b grade pyrolysis resin (10 parts by weight) and wheat flour (10 parts by weight) are used as a binder, industrial water (30 parts by weight) has a temperature of 20 ° C.

Obtained by this method, the briquette has a dropping strength of more than 90%, abrasion resistance in the drum of more than 80%, moisture content of less than 5%, ash content of less than 8%, the yield of volatile dry ashless mass of less than 20%, water absorption of less than 10%, the content of the working mass of iron oxide is less than 0.2%, aluminum oxide, titanium oxide is less than 0.4% (each), phosphorus oxide is less than 0.5%.

Example 3

A briquette is made in accordance with Example 1, but heavy b grade pyrolysis resin (10 parts by weight) and wheat flour (5 parts by weight) are used as a binder.

Obtained by this method, the briquette has a dropping strength of more than 95%, abrasion resistance in the drum of more than 90%, moisture content of less than 5%, ash content of less than 8%, the yield of volatiles on a dry ashless mass of less than 20%, water absorption of less than 10%, the content of the working mass of iron oxide is less than 0.2%, aluminum oxide, titanium oxide is less than 0.4% (each), phosphorus oxide is less than 0.3%.

Thus, the method according to the invention allows to obtain briquettes with increased strength, which makes it possible to repeatedly perform loading and unloading operations, increased water resistance and reduced content of impurities, such as iron, titanium, aluminum, phosphorus, undesirable for processes of silicon production in ore-heating furnaces .

Claims (4)

1. A method of producing a metallurgical briquette, comprising mixing the starting components - a carbon-containing material, a binder and water, pressing the briquette mixture and drying the formed briquette, characterized in that a two-component binder containing resin and flour in a ratio of 0.5: 1 is used as a binder up to 2: 1, while the starting components are taken in the following ratio, wt.%: carbon material not less than 50 two component binder 8–40 water with a temperature of 1 to 99 ° C rest 2. The method according to p. 1, characterized in that the two-component binder as a resin contains a heavy pyrolysis resin or wood resin, and as a flour - cereal flour. 3. The method according to p. 1, characterized in that before mixing the starting components, the carbon-containing material is crushed and / or subjected to magnetic separation.