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Iron-contained waste treatment method and equipment adopting same

A treatment method and waste technology, applied in the manufacture of converters, etc., can solve the problems of affecting the cooling effect of coolant, severe carbon-oxygen reaction, dust pollution and other problems, and achieve the effect of convenient process parameter control, simplified steps and low melting point

Inactive Publication Date: 2017-02-22
RUITONG PELLETIZING CO LTD OF XIANGTAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantages of this method are as follows: (1) Iron oxide scale must be used as the forming aggregate to make cold-setting balls, and iron oxide scales are high-quality iron-containing raw materials with high prices; (2) When cold-setting balls are used as coolants for steelmaking converters Because it contains about 5% moisture inside and organic additives such as syrup and polyacrylamide, it is easy to burst at high temperature, and the bursting of cold-set balls into powder will generate dust and pollute the environment; (3) the organic components contained in cold-set balls are in the Combustion at high temperature produces heat, which affects the cooling effect of the coolant on molten steel; (4) The carbon-oxygen reaction of the cold solid ball into the converter is more violent, and it is easy to cause splashing

Method used

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  • Iron-contained waste treatment method and equipment adopting same
  • Iron-contained waste treatment method and equipment adopting same
  • Iron-contained waste treatment method and equipment adopting same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] see figure 1 , the equipment used in a treatment method for iron-containing wastes includes a material storage device 1, a raw material premixing device 2, a conveying device 3, an electronic belt scale 4, an ore blending device 5, a pelletizing device 6 and a shaft furnace 7 (here A shaft furnace with a model of 10 flats is used at the place).

[0046] The material storage device 1 includes a converter mud bin 1.1 for storing converter mud, a sintering head ash bin 1.2 for storing sintering head ash, and a steelmaking dry dust removal bin for storing steelmaking dry dust removal ash. Ash silo 1.3, concentrate silo for storing gas ash and carbon-selected concentrate 1.4, premix silo for storing premixed mixture 1.5, for storing iron concentrate Iron concentrate silo 1.6, pelletizing binder silo 1.7 for storing pelletizing binder, low-temperature roasting agent silo 1.8 for storing low-temperature roasting agent, and water storage tank 1.9 for storing water.

[0047] T...

Embodiment 2-9

[0071] Embodiment 2-9 investigated the roasting time in the shaft furnace under the condition of 10 minutes, the impact of roasting temperature on the properties of oxidized pellets, other parameters are the same as in Example 1, and the details are as shown in Table 1:

[0072] Parameters and performance statistics of table 1 embodiment 1-embodiment 9

[0073]

[0074] As can be seen from Table 1, the selection of the roasting temperature is most suitable at 1050°C-1130°C, the roasting temperature is too low (such as Example 2-Example 6), and the intensity of the oxidized pellets is low (no more than 500N / piece), It cannot meet the actual needs (the pellets are subjected to friction, collision, extrusion and other mechanical forces in the shaft furnace, and the strength is too low and easy to break, resulting in powder, which affects the air permeability of the shaft furnace production and reduces the yield); the roasting temperature is too high High (such as Example 9), t...

Embodiment 10-13

[0076] Embodiment 10-13 investigated the influence of roasting time on the properties of oxidized pellets when the roasting temperature is constant, and other parameters are the same as in Example 1, and the details are as shown in Table 2:

[0077] Table 2 Embodiment 1 and the parameters and performance statistics of Embodiment 10-13

[0078] Parameters and performance / case Example 10 Example 1 Example 11 Example 12 Example 13 Calcination temperature / ℃ 1050 1050 1050 1050 1050 Roasting time / min 8 10 12 15 16 Roasting strength / N / piece 686 1009 1087 1167 1052

[0079] As can be seen from Table 2, when the roasting temperature is constant, the roasting time is too short (as in Example 10), and the intensity of the oxidized pellets is low (the reaction is insufficient if the time is too short); if the roasting time is too long, the oxidized pellets The strength of the ore does not increase significantly or decreases instead (a...

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Abstract

The invention provides an iron-contained waste treatment method. The iron-contained waste treatment method comprises the steps of: (1) raw material premixing; (2) raw material ore blending; (3) pelletizing; and (4) shaft furnace treatment; and the specific treatment process is as follows: green balls obtained in the step (3) are dried, preheated and roasted in a shaft furnace in sequence to obtain oxidized pellets as a steel production converter cooling agent, wherein the drying temperature is 400-500 DEG C, the drying time is 3-8 minutes, the preheating temperature is 800-950 DEG C, the preheating time is 10-15 min; the roasting temperature is 1050-1130 DEG C; and the roasting time is 10-15 min. The treatment method is simple in steps, easy to control process parameters and low in cost. The invention further discloses equipment adopting the treatment method; and the equipment includes a storage device, a raw material premixing device, a conveying device, an electronic belt scale, an ore blending device, a pelletizing device and the shaft furnace. The equipment is convenient for assembly, process parameter control in the treatment process and operation.

Description

technical field [0001] The invention relates to the technical field of steelmaking, in particular to a method for treating iron-containing waste and equipment used therefor. Background technique [0002] Iron-containing wastes in iron and steel plants mainly include sintering machine head ash, steelmaking dry process dust, converter mud, iron ore after gas ash carbon selection, etc. If the iron-containing waste is not followed up or recycled, it will be Resources are wasted and the environment is seriously polluted. [0003] In the prior art, there are mainly the following two treatment methods for iron-containing wastes from iron and steel plants: [0004] Method 1: Use the sintering batching process to obtain molten steel, specifically: firstly use the iron-containing waste to obtain sintered ore through sintering batching process, then put the sintered ore into the blast furnace to obtain molten iron, and finally refine the molten iron to obtain molten steel. This techn...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/02C22B1/243C21C5/28
CPCC22B1/02C21C5/28C22B1/2406C22B1/243
Inventor 谢路奔贺真魏伟周云花高在勇李明和周健智颜格聪郭新春张卫陈贤珍李健吴云
Owner RUITONG PELLETIZING CO LTD OF XIANGTAN
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