Process and apparatus for producing metals and/or primary metal products
View Patent ↗The invention relates to a process and an associated apparatus for producing metals and/or primary metal products, in particular pig iron and/or primary pig iron products, in which a metal-containing charge material, in particular in fine particle form, is introduced, using pneumatic conveying, by means of a carrier gas stream, in the form of a stream of medium formed from the charge material and the carrier gas stream, into a melting unit, in particular a melter gasifier, for further processing. According to the invention, the charge material is introduced after the carrier gas stream has been separated off and separately at at least two introduction points, so that at least two partial quantities of the charge material can be introduced independently of one another and continuously or in stacked form.
1. A method for producing a metal or a primary metal product, the method comprising:
pneumatic conveying a stream including a carrier gas and a charge material comprising fine metal-containing particles;
dividing the stream into at least two partial streams, each stream comprising a respective quantity of charge material;
separating off the carrier gas from each of the at least two partial streams; and
introducing at a first introduction point of a melting unit the charge material from a first stream of the at least two partial streams and introducing, independently of the introducing of the charge material of the first stream, the charge material from a second stream of the at least two partial streams at a second introduction point of the melting unit;
effecting control at the dividing of the stream of the quantity of charge material carried by each of the at least two partial streams by controlling the separating off of the carrier gas for each of the at least two partial streams prior to the introducing of the charge material.
2. The method as claimed in claim 1 , wherein the carrier gas comprises a process-internal gas.
3. The method as claimed in claim 2 , wherein the carrier gas further comprises a process-external gas.
4. The method as claimed in claim 2 , wherein the process-internal gas comprises gas from the melting unit.
5. The method as claimed in claim 1 , wherein the carrier gas comprises a process-external gas.
6. The method as claimed in claim 5 , wherein the process-external gas comprises nitrogen.
7. The method as claimed in claim 1 , wherein the carrier gas comprises a process-internal gas and a second carrier gas.
8. The method as claimed in claim 1 , wherein at least a portion of the carrier gas that has been separated off is then introduced into a treatment reactor.
9. The method as claimed in claim 8 , wherein the carrier gas that has been separated off is purified before introduction into the treatment reactor.
10. The method as claimed in claim 9 , wherein additional purified gas from the melting unit is further introduced into the treatment reactor.
11. The method as claimed in claim 1 , wherein at least a portion of the charge material is temporarily stored in a storage vessel before being introduced into the melting unit.
12. The method as claimed in claim 11 , wherein the charge material is subjected to an action of pressure before being introduced into the melting unit.
13. The method as claimed in claim 1 , wherein at least one metal-containing addition and/or at least one additive are introduced into the melting unit in addition to the charge material.
14. The method as claimed in claim 1 , wherein the at least two partial streams comprise six partial streams.
15. The method as claimed in claim 1 , wherein the at least two partial streams comprise between two and eight partial streams.
16. The method as claimed in claim 1 , wherein the introducing of the charge material is performed continuously in time.
17. The method as claimed in claim 1 , wherein the introducing of the charge material is performed in batches with gaps in time between the batches.
18. The method as claimed in claim 1 , wherein the separating off of the carrier gas is performed for each of the at least two partial streams prior to the introduction of any of the charge material into the melting unit.
19. The method as claimed in claim 1 , wherein the separating off of the carrier gas comprises a removal controlled in location with respect to the melting unit so as to control the quantity of charge material introduced at the first introduction point and the second introduction point.