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Method for removing sulfur from fuel before sintering iron ores

A technology of iron ore and fuel, which is applied in the field of interdisciplinary research, can solve the problems of huge amount of SO2, short gas-liquid phase reaction time, and low desulfurization efficiency, and achieve broad development and utilization prospects, long contact time, and high desulfurization efficiency.

Inactive Publication Date: 2012-06-27
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the huge amount of sintering flue gas, SO 2 Low concentration and short gas-liquid phase reaction time lead to low desulfurization efficiency and high cost. Although the emission concentration can meet the national standard, the actual emission of SO 2 volume is still huge

Method used

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  • Method for removing sulfur from fuel before sintering iron ores
  • Method for removing sulfur from fuel before sintering iron ores
  • Method for removing sulfur from fuel before sintering iron ores

Examples

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Effect test

Embodiment 1

[0033] Example 1: 10kg of coke particles (about 5mm) and 5kg of iron ore particles (about 0.5mm) were mixed, and 50kg of water were added to the turbine agitator, 1kg of NaOH was added, and the stirring was continued for 3 hours. The removal rate of sulfur >90%.

Embodiment 2

[0034] Example 2: After the first desulfurization, the obtained liquid was separated and continued to be used to process a mixture of 10kg of coke particles (about 5mm) and 2kg of iron ore particles (about 0.5mm), and mixed with 0.2kg of NaCO 3, continuously stirred for 2 hours in a turbine agitator, and the removal rate of sulfur was >90%.

Embodiment 3

[0035] Example 3: Mix 5kg of anthracite particles (about 5mm) and 2.5kg of iron ore particles (about 0.5mm), add them to the turbine mixer together with 20kg of water, and add 0.5kg of NaCO 3 , continuously stirred for 4 hours, and the removal rate of sulfur was >90%.

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Abstract

The invention belongs to the crossover study field between metallurgical engineering and environmental engineering and mainly relates to a method for removing sulfur from fuel for iron ores before sintering the iron ores. The method comprises the following steps: 1. coke and / or anthracite and iron ore powder are mixed and placed into aqueous solution to which alkali metals or alkaline-earth metalcompounds are added to leach the sulfur in the coke and / or anthracite; and 2. after the sulfur in the coke and / or anthracite is leached, solid and liquid are separated, the obtained solid phase is the mixture of the coke and / or anthracite and iron ore powder, and the mixture can be used for sintering the ingredients after being rinsed and dried. The method further comprises a method for recyclingthe aqueous solution of the alkaline compounds: the aqueous solution obtained through separation in the above method is the alkaline mixed solution containing soluble sulfur and soluble iron, then lime and / or hydrated lime is added to the alkaline mixed solution for precipitating and recycling the sulfur in the alkaline mixed solution, and the obtained liquid phase is continuously used for leaching the sulfur in the coke and / or anthracite.

Description

technical field [0001] The invention belongs to the intersecting research field of metallurgical engineering and environmental engineering, and mainly relates to a method for desulfurizing iron ore fuel before sintering. Background technique [0002] Coke and anthracite are the main raw materials for iron ore sintering, and their sulfur content accounts for 80-90% of the total sulfur content of sintering raw materials. High sulfur content in coke and / or anthracite leads to high SO generation during sintering 2 , seriously endangering the atmospheric environment. Sulfur in coke and / or anthracite can be divided into inorganic and organic forms. Inorganic sulfur includes: pyrite sulfur, sulfate sulfur and elemental sulfur; organic sulfur is mainly in the form of mercaptan (S-H) structure, sulfide ( R-S-R'), sulfanthrene and disulfanthrene, thiophene, thianne structure and thioquinone structure exist. The industrial coal washing method has reduced part of the sulfur content i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B03D1/00C22B1/11C10L9/02
Inventor 严鹏程李宏郭洛方李自权
Owner UNIV OF SCI & TECH BEIJING
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