Method of fabricating briquettes for metallurgical production

FIELD: metallurgy.

SUBSTANCE: invention refers to metallurgy and can be used for fabricating of metallurgical briquettes which are effective substitutes of coke in blast and cupola iron production. The mixture is prepared which includes 94-98 mas.% of filling compound - a carbon containing material, and the rest is a binding material such as an activated aluminium- boron- phosphate concentrate. Then forming of mixture is performed in an accessory under pressure and vibration. Activation of the aluminium- boron- phosphate concentrate is performed before immediate preparation of mixture by means of the binding material treatment with nano second electromagnetic impulses of 0.5-0.8 MW power.

EFFECT: invention upgrades quality of metallurgical briquettes due to their increased strength characteristics at a minimal quantity of a binding material and at a considerable reduction of time for briquette fabrication owing to briquettes self hardening and avoiding thermal treatment.

2 tbl, 2 ex

 

The invention relates to the field of metallurgy and can be used for the manufacture of metallurgical briquettes, which is an effective substitute for coke in the processes of blast and cupola iron production.

Currently, in terms of reduction of coking coal deposits and the high cost and complexity of obtaining coke utilization of secondary raw materials and related advanced technologies is a real way to increase the competitiveness of metallurgical production and production.

The current stage of scientific and technical progress in this area is inextricably linked with the creation of energy efficient technologies, providing comprehensive utilization of raw materials and reduction of harmful impacts on the natural environment.

In this regard, the preparation of briquettes from fine and fine components - metallurgical wastes - seems to be one of the efficient methods of preparation of the charge. Briquetting is the process of obtaining pieces (pellets) with the addition of binders, followed by pressing the mixture into pellets of the desired size and shape [Catini VI, Barsukova E. etc. Briquettes from fine waste of metallurgical and coke-chemical production - cost-effective replacement Trad is operating charge of metallurgical production. - Metallurg. - 2002. No. 10].

The purpose of the structure formation of fine materials is not only getting a certain amount of pieces, but also the creation of artificial structures of the complex set of physico-chemical properties [Belkin A.S., analysis of formation YU.S., Kuranov IVAN and others Use zhelezooksidnyh briquettes, cement bond. - Metallurg. - 2003. No. 4].

In this regard, there is a logical cause-and-effect relationship of technological parameters of pattern formation with the qualitative characteristics of the prepared materials.

Briquetting of fine-grained and fine-grained materials with binders is the most versatile way to engage in the recycling of valuable fuel and mineral raw materials - metallurgical wastes, which in its aggregate physical condition unsuitable for direct use in industrial processes and devices. Thus the distinguishing feature of the process of briquetting is the possibility of making briquettes from blend mixtures, effective for the main types of aggregates, metallurgical.

The most cost-effective and environmentally safe is cold briquetting. Known methods of manufacturing briquettes on the stamp, revolving, valicevic pre is Mar. However, they are characterized by low productivity, technological complexity, limited in size briquettes etc.

The closest in technical essence is a method for preparing metallurgical briquettes, which consists in preparing a mixture by mixing carbonaceous material and a binder is Portland cement, forming the snap-in under the action of pressure and vibration [RF patent №2183679, IPC7SS 5/52, SW 3/00, SW 1/24, SW 1/242. The brick for metallurgical briquette for washing the hearth of a blast furnace and a method of manufacturing briquettes].

Known technical solution provides the possibility of metallurgical briquettes of different size and weight. However, the prototype has the following major drawbacks:

- long cycle of cooking briquettes associated with increased duration of curing Portland cement;

the instability properties of briquettes determined by the change in their strength characteristics in time;

- high humidity briquette caused by mixing Portland cement with water.

- the need for heat treatment of the briquettes, which determines the high cost of drying ovens, appropriate space, and others;

- a relatively high binder content (15...20%)for increased ash is th briquette for use in metallurgical aggregates;

- poor wettability with a solution of Portland cement carbonaceous materials and, as a consequence, insufficient level of adhesion and durability;

- the need for processing briquettes steam (steaming).

All this together significantly reduces the quality of these metallurgical briquettes and efficiency of their application in the metallurgical industry.

The basis of the invention is to create such a method of preparation of metallurgical briquettes, which would improve their quality by providing increased strength characteristics with a minimum amount of binder and reducing the duration of training of briquette by samootverzhenij and exclusion operations steaming and heat treatment.

This task is solved in such a way that in the method of manufacture of metallurgical briquettes, including the preparation of the mixture of the filler and the binder, the mixing, molding the mixture in a snap under the action of pressure and vibration, according to the invention, as a binder used activated lumberport concentrate in the following ratio of ingredients:

td align="left"> activated lumberport concentrate
carbonaceous material (filler)94...98
the rest,

when this activation lumbantobing concentrate is carried out directly before preparing the mixture by exposure to nanosecond electromagnetic pulses with a power of 0.5 to 0.8 MW.

Lumberport concentrate (ABFC) is an aqueous solution and used as an effective high-temperature binder.

ABFC provides accelerated samootverjennyi briquette due to its interaction with components of the filler and the formation of a high strength characteristics due to the high adhesion without heat treatment.

Handling before cooking the mixture for briquette binder lumbantobing concentrate nanosecond electromagnetic pulses (name) allows to minimize the amount of binder (up to 2 wt.%) with a substantial increase in its cohesive strength due to the effect of "liquefaction" (decrease in viscosity) and increase the wettability ABFC carbon-containing material.

Thus, these distinctive features improve the physico-mechanical characteristics of metallurgical briquettes and provide a significant improvement of their quality.

Production of metallurgical briquettes as follows.

Ready the t binding ABFC density 1300...1350 kg/m 3. To activate the binder material handle ABFC nanosecond electromagnetic pulses with a power of 0.5 to 0.8 MW for 15 to 20 minutes.

Processing binder, NAMI power 0,5...0,8 MW is a necessary condition because it causes a significant positive change in its physical-chemical properties. When power NAMI less than 0.5 MW, the resulting effects are weak. Capacity name more than 0.8 MW, is impractical due to the rapid increase in energy costs without significantly improve the technological properties of the binder and briquette.

Activated ABFC introducing carbonaceous material in the following ratio of ingredients, wt.%:

carbonaceous material94...98
activated lumberport concentratethe rest of it.

The carbonaceous material can be used smelter coke and carbon powder, fines and dust, graphite powders (electrode fight and others). The ingredients are mixed and the prepared mixture is formed on the vibrating presses the corresponding snap (matrix cells) under the action of pressure and vibration. The duration of pressing is 15...30 s depending on the type of production machine. This can be obtained metallurgical briquettes almost any configuration and size from 20×20×20 mm to 500×1500×1500 mm Per cycle (no more than 30 seconds) may be produced from 0.05 to 1.2 cubic meters of metallurgical briquettes.

When exposed to NAMI density lumbantobing concentrate 1300...1350 kg/m3and number 2...6 wt.% create conditions for the uniform distribution of the binder on the particles of carbonaceous material. At a density of more than 1350 kg/m3viscosity lumbantobing concentrate increases so that makes this distribution. There is unwanted premature pelletizing material. Density ABFC less than 1300 kg/m3does not provide the required level of strength and other physical and mechanical properties of metallurgical briquettes.

The proposed method for the manufacture of metallurgical briquettes is illustrated by the following examples.

Example 1. In preparing the binder receive ABFC density of 1350 kg/m3. For this original composition ABFC (TU 113-08-606-87) diluted with water. Then before the actual preparation of a mixture of spend processing binder, name within 15 minutes. For this purpose he placed the emitters connected to the generator name capacity of 0.5 MW [RF Patent №2030097, MKI NC 3/33, K3/45. Shaper nanosecond is elektromagnitnykh pulses].

Activated binder is introduced into the carbon-containing material, which is used as smelter coke aggregate and detail.

Varies in a mixture of active ABFC in the mixture: 2; 4; 6 wt.%.

The ingredients are mixed in a screw mixer and the prepared mixture is formed into matrix cells on the production machine with a pressing force of 160 kN and vibration with an amplitude of 0.5 to 0.8 mm and a frequency of 50 Hz.

The duration of pressing is 15 sec. While receiving metallurgical briquettes 100×100×100 mm For one cycle is made of 0.15 cubic meters of metallurgical briquettes.

Comparative characteristics of metallurgical briquettes are shown in table 1.

As the base, the properties of briquettes obtained by making using of Portland ligament (prototype).

The data presented indicate that the use as a binder activated nanosecond electromagnetic pulses ABFC allows for significant improvement of physico-mechanical properties and improving the quality of briquettes for steel production.

It should be noted that without processing name spanning almost unable to obtain metallurgical briquettes so low is by cutting down ABFC (dramatically increases asiaeast and abrasion briquettes for steel production, binder unevenly distributed on the particles of carbonaceous material and other). However, it is clear that minimizing the amount of binder at ensuring a certain level of strength characteristics of briquettes can significantly improve their physico-chemical properties.

td align="center"> 0,1
Table 1
Comparative characteristics of methods for the production of briquettes for steel production
Name characteristicsPrototype (production of Portland cement briquettes)A method of manufacturing briquettes with NAMI when different quantities ABFC, wt.%
246
1. Cooking time, h30...360,71,01,2
2. The length changes of the properties that day.3...50,60,81,0
3. Humidity, %9...130,51,11,5
4. The need for heat treatmentYesNoNoNo
5. Ash content, %...2,0 1,80,20,3
6. Sulfur content, %...0,48 0,240,060,080,1
7. Impact strength, %50...52,8808385
8. The porosity (open),%16...20303334
9. Density, g/cm...2,3 2,11,651,621,60
10. Compressive strength, MPa9,5 11,0...21,122,322,9
11. Asiaeast, %1,1 2,7...0,60,40,34
12. Softening temperature, °...1200 1150149015201550

Example 2. Prepare a mixture of coke breeze (96 wt.%) and solution ABFC (4 wt.%). Production of metallurgical briquettes carried out analogously to example 1, but before mixing the ingredients of the mixture are processing binder, name for 20 minutes, varying the capacity of name: 0,5; 0,7; 0,8 MW.

The influence of processing parameters of name on the properties of the binder and metallurgical briquettes are shown in table 2. These parameters are compared with the baseline values for the case of using ABFC without processing name. The edges of the second contact angle is fixed projection drops on the screen, surface tension - method of isolation rings [Theoretical fundamentals of foundry technology / Ametista. TRANS. with exercise. - Kiev: high school, 1981. - 320 p]. The viscosity is determined by a capillary rheometer VPI-2. To assess impregnating ability to use a known technique of capillary impregnation ABFC filler in a tube of diameter 5 mm

Table 2
The influence of processing parameters of name on the properties of the binder and metallurgical briquettes
IndicesWithout nameProcessing NAMI capacity, MW
0,50,70,8
1. Wetting angle, deg83644846
2. Surface tension, j/m282919693
3. Kinematic viscosity, ×10-6m2/s1,551,10,70,8
4. The equilibrium height of the impregnation of the porous medium, m0,060,110,140,16
5. Impact strength, %76838 86
6. Compressive strength, MPa1122,323,723,4
7. Asiaeast, %0,60,40,10,2

The data presented indicate that processing NAMI power 0,5...0,8 MW binder ABFC allows for reducing its wetting angle, increasing the surface tension, reduce more than 2 times the viscosity to provide a significant improvement in sealing ability. This, in turn, creates conditions for increasing adhesion ABFC and improve the quality of briquettes for steel production with the possibility of significantly reducing the amount of binder in the composition of the briquette.

The claimed method of making briquettes for steel production tested upon receipt of pig iron in the blast furnace process and cupola melting.

Given the increased range of physical and mechanical properties of metallurgical briquettes, they can be used as an effective substitute for expensive and scarce coke.

A method of manufacturing briquettes for steel production, including the preparation of a mixture of filler - carbonaceous material and a binder, the mixing, in terms of form is the W of the mixture in the snap-in under the action of pressure and vibration, characterized in that the binder used activated lumberport concentrate in the following ratio of ingredients, wt.%:

filler94-98
activated lumberport concentraterest

when this activation lumbantobing concentrate is carried out directly before preparing the mixture by exposure to nanosecond electromagnetic pulses with a power of 0.5-0.8 MW.



 

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