RO137333A0

RO137333A0 - Ferrous briquettes made of pulverous ferrous waste and process for preparing the same

Info

Publication number: RO137333A0
Application number: ROA202200738A
Authority: RO
Inventors: Marian Blembea
Original assignee: Marian Blembea
Priority date: 2022-11-17
Filing date: 2022-11-17
Publication date: 2023-03-30
Also published as: RO137333A8; RO137333B1

Abstract

The invention relates to ferrous briquettes made of pulverous ferrous waste and to a process for making them, the briquettes being meant to be used in the steel and metallurgical industry as a raw material replacing scrap iron waste, and the process being intended to help to eliminate dumps with waste products harmful for the environment. The claimed ferrous briquettes comprise between 60...90% Fe, are egg-shaped with a diameter of 10 cm and have the following composition expressed as percentage by weight: 40...60% dross, 2...4% silicate, 20...30% ferrous sludge, 3...5% bentonite, 2...4% ecological binder used as binder, 2...4% lime and 0...4% metal shavings obtained by shredding, on a Schrreder-type shredding machine, the waste from various metal packaging such as food cans, beverage cans, paint cans and the like. The claimed process has the following steps: a. introducing pulverous ferrous waste and Fe-containing sludge into the thermal desorption plant to remove all hydrocarbons from the content, b. crushing the waste and sorting it on vibrating sieves where it is screened as grain size fractions of 0...0.1 mm, 0.1...0.5 mm and 0.5...1 mm, c. making the final mixture by mixing for 30 minutes the resulting ferrous waste with a quantity between 2...4% ecological binder, 2...5% bentonite, 2...4% silicate and 0...4% metal shavings, d. introducing the final mixture into a rotary press with egg-type moulds, with a roll diameter of 650 mm and a pressing power between 37...45 kw, resulting in unburned ferrous briquettes, and e. the last step being the sintering of the briquettes in an electric furnace for 45 minutes at a temperature of 1250°C.

Description

Descrierea invenției: Brichete feroase realizate din deșeuri feroase pulverulente si procedeu de obține a acestoraDescription of the invention: Ferrous briquettes made from pulverulent ferrous waste and method of obtaining them

Invenția se refera la brichete feroase realizate din deșeuri feroase pulverulente si la procedeul de obținere a acestora, brichetele fiind utilizate in industria metalurgica si cea siderurgica, înlocuind deseurile de fier vechi utilizate in cele doua industrii, ajutand la economia circulara a deșeurilor feroase produse de cele doua industrii.The invention refers to ferrous briquettes made from pulverulent ferrous waste and to the process of obtaining them, the briquettes being used in the metallurgical and steel industry, replacing the scrap iron used in the two industries, helping the circular economy of the ferrous waste produced by the two industries.

Sunt cunoscute diverse tipuri de brichete feroase, dar care utilizează spân metalic, capete de bare metalice, capete de table.Various types of ferrous briquettes are known, but which use metal chips, metal bar ends, sheet metal ends.

Pentru obtinearea brichetelor sunt utilizate amestecuri de deșeuri feroase pulverulente si mărunte cu granulatie de sub 1 mm cum sunt de exemplu cruste de tunder, halde exploatare steril, cenuși cu conținut de fier, pirite, si slamuri cu conținut de fier cum sunt de exemplu slamuri din bazinele de evacuare din otelarie, slamurile de furnal din combinatele siderurgice, tocatura de ambalaje metalice, utilizata pentru a marii procentul de fier al brichetelor, etcIn order to obtain briquettes, mixtures of powdery and small ferrous wastes with a grain size of less than 1 mm are used, such as, for example, thunder crusts, sterile mining dumps, ashes with iron content, pyrites, and sludges with iron content, such as, for example, sludges from exhaust basins from steelworks, blast furnace sludge from steel mills, shredding of metal packaging, used to increase the iron percentage of briquettes, etc.

Problema tehnica pe care o rezolva invenția consta in înlocuirea deșeurilor de fier vechi in otelariile cu cuptoare cu arc electric si a minereului de fier din combinatele siderurgice, avand in vederea ca bricheta feroasa este obtinuta din deseurile feroase produse de otelariile electrice si de combinatele siderurgice.The technical problem that the invention solves consists in the replacement of scrap iron waste in steelworks with electric arc furnaces and of iron ore from steelworks, bearing in mind that ferrous briquettes are obtained from ferrous waste produced by electric steelworks and steelworks.

Astfel, bricheta feroasa ajuta la economia circulara a deșeurilor rezultate in otelaii si nu numai, fabricandu-se un produs care ajuta la valorificarea deșeurilor siderurgce.Thus, the ferrous briquette helps the circular economy of the waste produced in steels and not only, by manufacturing a product that helps in the valorization of iron and steel waste.

Ca forma, bricheta feroase se prezintă in forma de ou cu un diametru de cca. 10 cm, cu o compoziție chimica cuprinsa intre 60 - 90 % Fe.In terms of shape, the ferrous lighter is egg-shaped with a diameter of approx. 10 cm, with a chemical composition between 60 - 90 % Fe.

iand

RO 137333 AORO 137333 AO

Forma de ou a brichetei asigura creșterea suprafeței de reacție, respectiv a vitezei de topire in baia de otel lichidThe egg shape of the briquette ensures the increase of the reaction surface, respectively the melting speed in the liquid steel bath

Brichete feroase au forma de ou cu un diametru de cca. 10 cm si au următoarea compoziție chimica exprimata in % in greutate: 40-60% tunder, 2-4% silicat, 20-30 % slam feros, bentonite 3-5 %, var 2-4%, 0-4% tocatura metalica, iar ca liant se utilizează un binder ecologic in proporție de 2-6%. In funcție de compoziția deșeurilor feroase folosite, procentele utilizate se pot schimbaFerrous briquettes are egg-shaped with a diameter of approx. 10 cm and have the following chemical composition expressed in % by weight: 40-60% tunder, 2-4% silicate, 20-30% ferrous sludge, bentonites 3-5%, lime 2-4%, 0-4% metal shavings , and an ecological binder is used as a binder in a proportion of 2-6%. Depending on the composition of the ferrous waste used, the percentages used may change

Invenția prezintă in consecința următoarele avantaje:The invention consequently presents the following advantages:

- Permite utilizarea in vederea reciclării a unei game largi de deșeuri feroase pulverulente si mărunte;- It allows the use for recycling of a wide range of powdery and small ferrous waste;

- Permite utilizarea ca materii prime a unor deșeuri din alte industrii;- Allows the use of waste from other industries as raw materials;

- Permite utilizarea deșeurilor depozitate in halde, cat si a celor provenite de la fluxurile curente de fabricație;- Allows the use of waste stored in landfills, as well as those from current manufacturing flows;

- Forma de oupermite crestrea sprafetei frontului de reacție;- The shape allows the growth of the surface of the reaction front;

- Tehnologia de fabricate este flexibila in ceeea ce privește numărul de sortimente utilzate cat si ponderea lor in reteta;- The manufacturing technology is flexible in terms of the number of varieties used as well as their weight in the recipe;

Procedeul de obținerea a brichetelor feroase conform invenției permite realizarea scopului propus, prin aceea ca se aduce înapoi in utilizare deseurile generate de industria metalurgica si nu numai.The procedure for obtaining ferrous briquettes according to the invention allows the achievement of the proposed goal, in that it brings back into use the waste generated by the metallurgical industry and not only that.

In prima faza, deseurile pulverulente, slamurile cu conținut de fier se introduc in instalație de desorbtie termica in vederea decontaminării de hidrocarburi. Având hidrocarburi, nu permit realizarea legăturii binder-ului cu particulele de slam. Este cea mai importanta faza din obținerea brichetelor feroase.In the first phase, the pulverulent waste, sludges containing iron are introduced into the thermal desorption facility in order to decontaminate hydrocarbons. Having hydrocarbons, they do not allow the bonding of the binder with the sludge particles. It is the most important phase in obtaining ferrous briquettes.

După, trecerea prin instalație de desorbtie, se face concasarea lor in vederea obținerii granulatiilor optime brichetarii.After passing through the desorption plant, they are crushed in order to obtain the optimal granulations for briquetting.

După concasare, tot materialul se trece prin sistemul de site vibratoare, astfel se realizează sortarea pe dimensiuni specific, cuprinse intre 0-0,1 mm, 0,1-0,5 mm, 0,5lmm.After crushing, all the material is passed through the vibrating screen system, thus sorting is carried out according to specific sizes, between 0-0.1 mm, 0.1-0.5 mm, 0.5 mm.

RO 137333 AORO 137333 AO

In funcție de reteta solicitata de clinetul final al brichetelor feroase, se trece apoi la malaxarea cu binder in vederea obținerii mixurii finale. Aceasta mixura se introduce in presa rotative, cu matrite tip ou rezultând brichetele feroase.Depending on the recipe requested by the final customer of the ferrous briquettes, it is then moved to mixing with the binder in order to obtain the final mixture. This mixture is introduced into the rotary press, with egg-type molds resulting in ferrous briquettes.

Ultima faza este cea de sinterizare a brichetelor intr-un cuptor electric timp de 45 min. la o temperature de 1250 Grad C.The last phase is the sintering of the briquettes in an electric furnace for 45 min. at a temperature of 1250 Degree C.

Claims

1. Ferrous briquettes made from pulverulent ferrous waste characterized by the fact that they have the shape of an egg with a diameter of 10 cm with the following chemical composition expressed in % by weight: 40-60% tunder, 2-4% silicate, 20-30% ferrous sludge , 3-5% bentonite, 2-4% ecological binder, 2-4% lime and 0-4% metal shavings.

2. Ferrous briquettes made from pulverulent ferrous waste, according to claim 1, characterized in that the metal shredding is obtained by shredding the ferrous waste of metal packaging such as tin cans, beverage cans, paint cans, and the like, made on a schrreder-type chopping machine.

3. The procedure for obtaining ferrous briquettes, characterized by the fact that it has the following stages:

a) pulverulent ferrous waste is introduced into the thermal desorption facility to remove all hydrocarbons from the component;

b) crushing the waste and sorting it on a vibrating sieve where the sieving takes place on granulometric fractions of 0 - 0.1 mm, 0.1 - 0.5 mm, 0.5-1 mm.

RO 137333 AO

c) making the final mixture by kneading for 30 minutes the resulting ferrous waste with 2-4% ecological binder, 2-5% bentonite, 2-4% silicate, 0-4% metal shavings

d) Introducing the final mixture into the egg-type rotary press with a power of 37-45 kw and with a roll diameter of 650 mm, from which unburnt ferrous briquettes result

e) Sintering the briquettes in an electric furnace for 45 min at 1250 degrees C.