SU1505902A1 - Method of producing converter lime - Google Patents

Abstract

The invention relates to the ferrous metallurgy industry, primarily to a method for producing converter lime. The aim of the invention is to increase the yield of standard lime and improve the metallurgical properties of fine and pulverized lime by increasing its reactivity. The limestone is fired in a multi-zone fluidized bed furnace and, in the form of burnt lime with a particle size of 3-20 mm, is directed to a conveyor of cooled lime, then divided into 2 size classes: 8-20 and 3-8 mm. Lime with a particle size of 8–20 mm is served without additional processing to a converter shop, and with a particle size of 3–8 mm, the conveyor belt is fed into a mixing device. Dust lime with a particle size of less than or equal to 1 mm, caught in the gas cleaning system and in technological cyclones, is also fed to the same mixing device. Mixing of pulverized and lumpy lime is carried out in a ratio of 2: 3-1.1: 0.9 and briquetted until the briquette density reaches 2.1-2.6 g / cm ³ . Reactivity is 28-33 seconds. 1 tab.

Description

3150

The method is carried out as follows.

Lime is burned in a multi-zone furnace of the fluidized bed 1 and, in the form of comminuted lime with a size of 3-2 bmm, is sent to the conveyor 4 of cooled lime, then fed to a double screen, where it is divided into two classes of size: 8- 20 and 3-8 mm. Lime with a particle size of 8–20 mm is served without additional treatment to the convertible shop. Lime with a grain size of 3–8 mm is fed to the mixing device 10 through the conveyor. Dusty lime with a grain size of 0–1 mm, caught in the gas cleaning system 3 and in technological cyclones 2, is also fed into the same mixing device. The mixture of pulverized and lump lime is produced in a ratio of 2 : 1.1, in the form of a homogenous mixture, is fed to a roller briquette press 11 and is briquetted until briquette density is reached 2.1-2.6 g / cm, from where the conveyor 12 is fed to hopper 13, and by special transport in the converter shop.

Reducing the proportion of powdered lime below the ratio of 2/3 leads to a decrease in the density of the briquette due to the empty spaces between the particles of lumpy lime and powdered lime. The strength of the briquettes decreases and their reactivity decreases; Excess ratio above limit

0

0

five

0

five

1.1 / 0.9 leads to an increase in the density of the briquette, i.e. again to reduce its strength and reactivity.

Test data briquettes presented in the table.

Thus, briquetting a mixture of powdered lime with a particle size of 0–1 mm and sifting out of lumpy lime with a particle size of 3–8 mm in a 1: 1 ratio and a briquette density of 2.1–2.6 g / cm makes it possible to significantly increase the output of converter lime during calcination of limestone in a multi-zone furnace fluidized bed.

Claims (1)

Invention Formula A method of producing converter lime, including heating and burning lime in a multizone fluidized bed furnace, cooling lump lime and trapping powdered lime in process cyclones and a gas cleaning system, characterized in that, in order to increase the yield of conditioned lime and improve the metallurgical properties and powdered lime by increasing its reactivity, powdered lime with a particle size less than or equal to 1 mm is mixed with piece of lime with a particle size of 3-8 mm in a ratio of 2: 3 - 1.1: 0.9 and subjected to briquetting until the density of the briquettes was 2.1 - 2.6 g / cm. 2.78 2.77 2.77 2.77 2.77 2.75 2.73 2.67 2.65 2.58 2.48 2.40 2.30 2.29 2.25 2.14 2, 08 2.02 1.98 1.95 1.94 1.93 1.92 1.90 1.88 36 34 33 22 21 20 19 19 20 22 28 34 39 44 46 54 58 66 11z1ktan , f-n "D yL / MUMOMtee-itmtef- | G intf, - l / ““. ffiueaui f «Compiled by A. Kulabukhova Xgcufta ivp / n Editor A. Motyl Tehred A. Kravchuk Order 5386/23 Circulation 591 Subscription VNIIPI State) South Committee on Inventions and Discoveries at the State Committee on Science and Technology of the USSR 113035, Moscow, Zh-35, 4/5 Raushsk nab. in ivmi tain Proofreader M.Samborsk