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Chemical additive for sintering iron ore fine

A chemical additive and additive technology, applied in the field of chemical additives for iron ore powder sintering, can solve problems such as physical and mental health hazards of operators, economic losses of blast furnace ironmaking, accelerated sintering waste gas dust removal and corrosion of metal materials in cooling recovery devices, etc.

Inactive Publication Date: 2006-09-06
刘虎生
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the use of these additives brings superficial benefits to sintering, it causes huge economic losses to blast furnace ironmaking, and the advantages outweigh the disadvantages
In addition, these additives contain a large amount of nitrate, chloride and fluorite (CaF 2 ) generates NO at high temperature during sintering X , Cl and F will accelerate the corrosion of metal materials in sintering waste gas dust removal and cooling recovery devices, and discharge into the atmosphere is the main factor for the formation of acid rain and greenhouse effect, and it will also cause harm to the physical and mental health of operators

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] The effective component content (percentage by weight) is: 30% of oxygen enhancer (cerium nitrate); 10% of free radical initiator (alkoxyamine); 40% of flux (30% of barium oxide, 70% of manganese dioxide); Strengthening agent 5%; catalyst 5%; crystal nucleus agent 10% (boric anhydride 25%, chromium oxide 35%, copper oxide 40%).

Embodiment 2

[0022] The effective component content (percentage by weight) is: 32% of oxygen enhancer (50% of cerium nitrate, 50% of calcium nitrate); 8% of free radical initiator (50% of alkoxyamine, 50% of aryl iodide metal salt); Flux 39% (barium oxide 50%, manganese dioxide 50%); strengthening agent 6%; catalyst 7%; crystal nucleus agent 8% (boric anhydride 40%, chromium oxide 30%, copper oxide 30%).

Embodiment 3

[0024] The effective component content (percentage by weight) is: 29% (calcium nitrate) of oxygen enhancer; 11% (aryl iodide metal salt) of free radical initiator; 36% of fluxing agent (40% of barium oxide, 60% of manganese dioxide) Strengthening agent 7%; Catalyst 8%; Crystal nucleus agent 9% (boric anhydride 30%, chromium oxide 30%, copper oxide 40%).

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Abstract

The invention relates the chemical addition agent used for iron ore powder caking. The grain size is above 50mesh, oxygenation agent is 20-45wt%, free radical initiation agent is 5-15%, fluxing agent is 5-15%, hardening agent is 2-15%, accelerating agent is 2-15%, and crystal nucleus agent is 5-20%. The invention doesní»t contain the unwanted K and Na, and the characters are following: using free radical initiation to improve sintered layer air permeability; using rare-earth element to accelerate the association and crystallization of caking solid-liquid; using crystal nucleus agent to reject the sintered ore spontaneous efflorescence and low-temperature deacidizing efflorescence. The addition agent is 0.1-0.3íÙ, improving the output by 5%, rotary drum intensity by 3.4%, SFCA content by 15%, RI by 7.83%, low-temperature deacidizing efflorescence index by 8.2%, and reducing caking solid burn-up by 8%.

Description

technical field [0001] The invention relates to a chemical additive for iron ore powder sintering, which is mainly used for improving and increasing the output quality of sintered ore, promoting blast furnace ironmaking to increase output, coke saving and environmental protection. Background technique [0002] The significance of sintering is to sinter powdery iron-containing materials into lumps with suitable particle size. According to the requirements of blast furnace ironmaking concentrate technology, the sintered block material should have good mechanical strength, uniform particle size composition, high iron grade, less harmful impurities, stable chemical composition, and good reducibility. and high temperature metallurgical properties. Iron ore powder sintering is a mineralization process involving very complex physical and chemical changes, including solid phase reaction and new phase formation at low temperature, binder phase and liquid phase formation at high temp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/16
Inventor 刘虎生
Owner 刘虎生
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