TH17625B - Method for making dry iron ore pellets - Google Patents

Abstract

DC60 (14/08/46) equipment for the production of rolled steel. And the method of drying pellets for use in the equipment as disclosed. The device consists of Pellet machine Or Brikets For mixing or agglomeration of reducing charcoal with iron oxide iron ore to form pellets, drier for granulating pellets, reducing furnaces. Circular rotary burner design for extruding dried pellets. In a high temperature atmosphere, the first heat exchanger for heat exchange Between the hot gas released from the reducing furnace and the combustion air That is supplied to the reducing furnace and coolant for cooling the hot gas Second heat exchanger for heating the drying air. That was placed on the exit side of the first heat exchanger The drying air is heated by a second heat exchanger. Which is supplied to the drier to dry the pellets with drying air. That there is almost no moisture As a result That can be performed with high efficiency Steady drying in the drier and the consistent high quality of ironed out can be produced. Equipment for the production of reduced iron And how to dry the pellets For use with the devices as disclosed, the devices include Pellet machine Or briquettes for mixing or coagulation of reducing agents with iron ore oxides. To form pellets, drier for drying pellets, circular rotary kiln for extruding pellets In a high temperature atmosphere, the first heat exchanger is used for heat exchange between hot output gases. That is drained from the reducing furnace to the combustion air That was supplied to the reducing furnace And coolant for cooling off hot gases Second heat exchanger For heating the drying air The drying air was heated by the second heat exchanger. That was supplied to the drier To dry pellets with dehydrated air That there is almost no moisture The result can be performed with high efficiency. Steady drying in the drier And able to produce consistently high quality reduced

Claims (1)

1. Methods for drying pellets The method is used in equipment for reducing reducing iron by mixing and coagulating powder reducing agents. And iron oxide powder in pellet machine Or in Brikets To form pellets Drying of pellets in a dryer And reducing the dried pellets In a high-temperature atmosphere in a reducing furnace where the range of the hot gas temperature Was supplied to the drier. Is set on the basis of the following equation The sulfuric acid dew point temperature (formula) where Tg is the temperature (ํ) of the hot gas and CH20 is the moisture concentration (% by volume) in the hot gas. 2. Method for granulation. Dry As stated in Clause 1, where the equipment for the reduced iron production The temperature of T8 of the hot gas was set at T8 less than or equal to 300 cc. 3. Method for dry iron ore pellet production. Where Stages of mixing And coagulate the powder of reducing agents And powder of iron oxide To form wet tablets The wet granulation is inserted into the drier and the hot dry gas is supplied to the drier to dry the dry granules, where the thermal dry gas controls its moisture content. So that it might stay above the sulfuric acid dew point temperature And to prevent the pellets from being pressed against each other. 4. Method for the production of dry iron ore pellets as described in Clause 3, where the dry gases have a temperature which is defined as Sulfuric acid dew point temperature Less than or equal to Tg, less than or equal to 100/40 * CH20 + 200, where T8 refers to the temperature (c.) Of the heated dry gas and CH20 refers to the moisture concentration (% by volume) in the dry gas. Heat 5. Methods for producing dry iron ore pellets as described in Clause 4. Where the reducing agent is charcoal. The thermally dry gas temperature is defined as Tg less than or equal to 300 cc. 6. Methods for the production of dry iron ore pellets as described in claim 3, where thermally dry gas is supplied. have By the hot air in the second heat exchanger at the exit of the first heat exchanger Which supplies the heated air to the reducing furnace Both heat exchangers are heated by gas from the reducing furnace. 7. Method for producing dry iron ore pellets as described in claim 6, where the dry gases have a temperature which Is defined as Sulfuric acid dew point temperature Less than or equal to Tg, less than or equal to 100/40 * CH20 + 200 where Tg is the [c.c.] temperature of the thermally dried gas and CH20 is the moisture concentration (% by volume) in the dry gas. Heat 8. Method for the production of dry iron ore pellets as described in Clause 7, where the reducing agent is charcoal. And the temperature of the hot dry gas is defined in Tg. Less than or equal to 300 c. 9. Method for the production of dry iron ore pellets as described in Clause 6, where part of the dry gas is heated. At least The method for the production of dry iron ore pellets is described in Clause 9, where the heated dry gas has a temperature defined as Sulfuric acid dew point temperature Less than or equal to Tg, less than or equal to 100/40 * CH20 + 200, where Tg is the [repeated] temperature of the hot dry gas and CH20 is the moisture concentration (% by volume) in the dry gas with Hot 1 1.Method for dry iron ore pellet production As stated in claim 10, where the reducing agent is charcoal and the temperature of the thermally dried gas is defined as Tg less than or equal to 300C.