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A method for removing alkali metals by sintering

An alkali metal removal technology, applied in the field of metallurgy, can solve the problems of low overall utilization level, soaring iron ore prices, deterioration of material column permeability, etc. the effect of strength

Active Publication Date: 2015-12-09
红河钢铁有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Alkali metals are very harmful to blast furnace smelting. In the blast furnace, coke will be eroded, the gas permeability of the material column will be deteriorated, the cycle enrichment will cause nodules and damage the furnace wall, and the carbon bricks at the bottom of the furnace will be eroded into channels, and lead and zinc will be deposited. Rising, shortening furnace life, etc.
[0004] The quality characteristics of my country's iron ore are: "poor, fine, miscellaneous, and scattered", resulting in a low overall utilization level. The domestic iron ore supply is far from meeting the development of my country's iron and steel industry. Therefore, it is necessary to import finished iron ore from abroad, but The price of imported iron ore has soared in recent years

Method used

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  • A method for removing alkali metals by sintering

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] A. Raw materials are prepared according to the following mass percentages: iron powder ore: 30-60%, concentrate: 40-70%, CaCl 2 Powder: 1.11%, dolomite: 8-12%, limestone: 1.5-6.5%, quicklime: 3-5%, fuel: 5-6.5%;

[0024] B. Send the raw materials prepared in step A into the mixing mixer, add water to stir and granulate, and control the moisture content of the mixture particles to 6-8%;

[0025] C. Send the mixed material particles prepared in step B to the sintering machine trolley, control the material layer height of the mixed material particles to 600-700mm, and ignite and sinter at the ignition temperature of 1100-1300°C to obtain sintered ore ;

[0026] D. The sintered ore obtained in step C is conventionally crushed, sieved, cooled, and then sprayed with 0.5-0.7 kg of sintered ore per ton, and the concentration of 0.015% CaCl 2 The solution is sprayed on the sinter.

Embodiment 2

[0028] A. Raw materials are prepared according to the following mass percentages: iron powder ore: 30-60%, concentrate: 40-70%, CaCl 2 Powder: 1.67%, dolomite: 8-12%, limestone: 1.5-6.5%, quicklime: 3-5%, fuel: 5-6.5%;

[0029] B. Send the raw materials prepared in step A into the mixing mixer, add water to stir and granulate, and control the moisture content of the mixture particles to 6-8%;

[0030] C. Send the mixed material particles prepared in step B to the sintering machine trolley, control the material layer height of the mixed material particles to 600-700mm, and ignite and sinter at the ignition temperature of 1100-1300°C to obtain sintered ore ;

[0031] D. The sintered ore obtained in step C is conventionally crushed, sieved, cooled, and then sprayed with 0.5-0.7 kg of sintered ore per ton, and the concentration of 0.015% CaCl 2 The solution is sprayed on the sinter.

Embodiment 3

[0033] A. Raw materials are prepared according to the following mass percentages: iron powder ore: 30-60%, concentrate: 40-70%, CaCl 2 Powder: 2.22%, dolomite: 8-12%, limestone: 1.5-6.5%, quicklime: 3-5%, fuel: 5-6.5%;

[0034] B. Send the raw materials prepared in step A into the mixing mixer, add water to stir and granulate, and control the moisture content of the mixture particles to 6-8%;

[0035] C. Send the mixed material particles prepared in step B to the sintering machine trolley, control the material layer height of the mixed material particles to 600-700mm, and ignite and sinter at the ignition temperature of 1100-1300°C to obtain sintered ore ;

[0036] D. The sintered ore obtained in step C is conventionally crushed, sieved, cooled, and then sprayed with 0.5-0.7 kg of sintered ore per ton, and the concentration of 0.015% CaCl 2 The solution is sprayed on the sinter.

[0037] In all the above-mentioned embodiments, the conventional sintering process is used in t...

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Abstract

The invention discloses a method for removing alkali metals in a sintering process. CaCl2 powder is added in the sintering raw materials, and in the sintering process, CaCl2 powder is reacted with alkali metals existing in the form of silicate in the sintering raw materials to generate more stable NaCl and KCl; since the pressure in the furnace is in a negative pressure state during the sintering, the boiling points of NaCl and KCl are lower, so that NaCl and KCl are evaporated in the combustion layer and discharged to the outside of the reaction zone; simultaneously, the low-temperature reduction strength of the sintered ore is improved by spraying a CaCl2 solution on the cooled sintered ore; due to the adoption of the method, alkali metals contained in the metal ore are effectively removed, the alkali metal load in a smelting process is reduced, the service life of the blast furnace is prolonged and the harm of alkali metals is reduced, thereby being beneficial to the smelting of the blast furnace.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a method for removing alkali metal contained in metal ore during sintering and effectively reducing the load of alkali metal in the smelting process. Background technique [0002] Alkali metals refer to Group 1 elements in the periodic table of elements, including: lithium, sodium, potassium, rubidium, cesium, and francium. Although hydrogen belongs to Group 1 in name, its chemical properties are quite different from those of alkali metals. Far, so it is not usually considered an alkali metal. The chemical properties of alkali metals show very obvious homologous behavior, which is the best example of reflecting the periodicity of elements. Alkali metals have many similar properties: they are silver-white metals with low density, low melting and boiling points, and high reactivity under standard conditions. [0003] The alkali metals involved in the ferrous metall...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B1/16
Inventor 王洁张剑明周伟
Owner 红河钢铁有限公司
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