SU545682A1

SU545682A1 - Method for agglomeration of iron ore concentrates

Info

Publication number: SU545682A1
Application number: SU2187796A
Authority: SU
Inventors: Серафим Васильевич Колпаков; Геннадий Васильевич Коршиков; Евгений Васильевич Невмержицкий; Герман Алексеевич Соколов; Михаил Александрович Хайков; Леонид Иванович Шашенков
Original assignee: Институт металлургии им.А.А.Байкова АН СССР; Липецкий Политехнический Институт Мв И Ссо Рсфср; Предприятие П/Я А-3244
Priority date: 1975-11-03
Filing date: 1975-11-03
Publication date: 1977-02-05

Description

Изобретение относитс к области металлургии .This invention relates to the field of metallurgy.

Известен способ окусковани железорудных концентратов, включающий смешивание, окомкование с добавкой влаги, топлива и флюса, спекание с просасыванием газа и подводом тепла от внешнего источника 1.There is a method of agglomeration of iron ore concentrates, which includes mixing, pelletizing with the addition of moisture, fuel and flux, sintering with sucking gas and applying heat from an external source 1.

Способ не обеспечивает достаточной прочности окускованной шихты и высокой производительности агрегата.The method does not provide sufficient strength agglomerated charge and high performance of the unit.

С целью повышени качества продукта и производительности агломашины ирн спекании шихты, окомкованной до крупности 2- 20 мм с содержанием фракции 5-20 мм в количестве 50-70%, в предложенном способе флюс и топливо в соотношении 1 : (1,) ввод т путем накатывани соответственно в количестве 20-50% и 60-85% от общего содержани их в шихте на 0,25-2% влаги выше оптимальной, а подвод тепла от внешнего источника при спекании осуществл ют в количестве 17000-40000 ккал на 1 м площади агломашины в течение времени, составл ющего 10-30% от продолжительности процесса.In order to improve the quality of the product and the productivity of the sintering machine Irn, sintering the charge, pelletized to a particle size of 2-20 mm with a fraction of 5-20 mm in the amount of 50-70%, in the proposed method, flux and fuel in the ratio 1: (1,) are introduced by rolling, respectively, in the amount of 20-50% and 60-85% of their total content in the charge is 0.25-2% moisture above the optimum, and heat from an external source during sintering is supplied in an amount of 17000-40000 kcal per 1 m area sinter machine for a time of 10-30% of the duration of the process.

С целью обеспечени условий получени высокопрочных продуктов спекаии из шихты, не содерл ащей мелких гранул (меньше 2 мм), .необходимо изменить тепловой спекани , например увеличить количество теила от зажигательного горна с 17 до 35-40 тыс. ккалIn order to ensure the conditions for obtaining high-strength caking products from a mixture not containing small granules (less than 2 mm), it is necessary to change the thermal sintering, for example, to increase the amount of teila from incendiary hearth from 17 to 35-40 thousand kcal

на 1 М площади агломашины и высоту спекаемого сло до 500 мм и выше. Тогда количества тепла включающего тепло от внутреннего источника (углерода топлива в шихте) в момент выхода сло из-под зажигательного горна, а также тепла от комбинированного нагрева в зоне сиекани будет достаточно дл того, чтобы характеризовать режим как «обжиговый .on 1 M of the area of the sintering machine and the height of the sintered layer to 500 mm and above. Then the amount of heat including heat from the internal source (carbon fuel in the charge) at the time the layer leaves the incendiary hearth, as well as the heat from the combined heating in the area of the siege will be enough to characterize the mode as “firing.

Предложенный способ опробован на чаше диаметром 260 мм. Шихта состо ла из 30% возврата, концентрата (содержание фракции 0,05-О мм равно 78-82%), известн ка, доломита и извести.The proposed method was tested on a bowl with a diameter of 260 mm. The mixture consisted of 30% return, concentrate (the content of the fraction 0.05-О mm was 78-82%), lime, dolomite and lime.

Дл повышени крупности окомкованной шихты до заданного уровн влажность увеличили на 0,75% относительно оптимальной величины (8%) при обычном способе спекани . При этом на начальной стадии окомковани To increase the size of the pelletized mixture to a predetermined level, the humidity was increased by 0.75% relative to the optimum value (8%) with the conventional sintering method. In this case, at the initial stage,

Claims

removed part of the lime (30% of its total consumption of 3.5%) and part of the fuel (75% of the total consumption of 4.3%). Both of these components in the specified ratio were fed at the end of the pelletizing for rolling onto a clumping mixture. As a result, the mixture was obtained by the crudes from 2 to 20 mm with the content of the fraction 5–20 mm in the amount of 63%. In the usual method of sintering such a mixture, the product is a conglomerate of poorly folded granules. An increase in the amount of heat from an external source by increasing the duration and duration of the ignition from 1 min to 3 allowed improving the quality of this area while simultaneously increasing the specific productivity due to the high speed of the application. With the proposed sintering method, the nrnrost specific installation rate was 35%. The quality of the agglomerate, estimated at a yield of the fraction of 5–20 mm and wearing about 100 revolutions of the Rubin drum, improved by 10%. In onyty for rolling 1 used negait lime, under the conditions of e; 1 of these purposes, it is possible to use slaked lime, limestone and dolomite fines, as well as burnt dolomite. The best results are given by nrimeeeinu hardened known. The invention is the method of agglomeration of iron ore concentrates, including mixed, pelletized, with the addition of moisture, flux and flux, with gas suction and Tenla water supply from an external source, characterized in that, in order to improve the quality of the product and the performance of the plant, it needs to be made from special material and with the help of a special agent. 2-20 mm with the content of the fraction 5-20 mm in the amount of 50-70%, the flux and fuel in the ratio of 1: (1) are injected with chickens of rolling in the amount of 20-50% and 60-85% of the sludge content in charge 0.25-2% moisture in nuc oitimalnoy and nodvod teila from istochiika iri siekannn osun1, estvl in an amount 17000-40000 kcal ua 1 m square sintering machine during the time was 10-30% of yun1ego irodolzhiteliosti nrotsessa. The source of information, taken into consideration during the examination: 1. Copyright certificate Kho 410090; cl. C 21 L 1/20; 03.22.77