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Method for recovering potassium elements from sintering ashes of steel and iron works and preparing potassium sulfate

A technology of sintered ash and potassium sulfate, applied in chemical instruments and methods, alkali metal sulfite/sulfite, potash fertilizer, etc., can solve the problem of increased energy consumption in device operation, increased specific resistance of dust particles, and excessive dust concentration and other problems, to achieve the effect of simple process flow, efficient recycling and improved service life

Active Publication Date: 2010-06-09
HUNAN VALIN XIANGTAN IRON & STEEL CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Excessive content of alkali metal compounds such as potassium and sodium in the sinter ash will cause corrosion of the furnace body of the ironmaking blast furnace on the one hand, thereby affecting the service life of the blast furnace, resulting in the shutdown of the blast furnace and the instability of ironmaking production
On the other hand, the specific resistance of these sub-micron dust particles will increase, making it difficult to be effectively captured by the electrostatic precipitator, which will significantly affect the dust removal efficiency and operational stability of the sintered electrostatic precipitator, and lead to dust emission from the electric dust collector. The concentration exceeds the standard and the energy consumption of the device operation increases

Method used

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  • Method for recovering potassium elements from sintering ashes of steel and iron works and preparing potassium sulfate
  • Method for recovering potassium elements from sintering ashes of steel and iron works and preparing potassium sulfate

Examples

Experimental program
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Embodiment 1

[0014] Take 250 kg of sintered ash containing 8% potassium at room temperature, add it to 1000 L of water (solid-to-liquid ratio is 1:4), and add 0.50 kg of dispersant to it, and then stir for 30 min at a stirring speed of 80 r / min. After the stirring is completed, the sintered ash suspended mud is centrifugally filtered, and the obtained filtrate is used for circulating water to elute potassium twice according to the above method, and the obtained filter residue is mixed as iron ore sintering material. Extract the filtrate with a pH value of about 11.2, and add 6kg of industrial NH 4 HCO 3 , 0.5kg of powdered activated carbon, stirred at 80r / min for 15min, and added 0.60kgKOH to keep the pH of the system at about 8.5, so that the precipitation reaction is complete. After impurity removal and decolorization are completed, the suspension is centrifugally filtered, and the filter residue is returned as iron ore sintering ingredients, and 96kg of industrial (NH 4 ) 2 SO 4 , u...

Embodiment 2

[0017] Take 200kg of sintered ash containing 10% potassium at room temperature, add it to 800L water (solid-to-liquid ratio is 1:4), add 0.75kg dispersant to it, and stir at 80r / min for 20min. After the stirring is completed, the sintered ash suspended slurry is centrifugally filtered, and the obtained filtrate is used for circulating water to elute potassium three times according to the above method, and the obtained filter residue is mixed as iron ore sintering material. Extract the filtrate with a pH value of about 11.5, and add 8kg of industrial NH 4 HCO 3 1. 15 kg of industrial coke powder with a particle size of 60 mesh was stirred for 15 min at a speed of 80 r / min to remove impurities and decolorize the solution. During the stirring process, add 0.75kg of industrial KOH caustic soda to keep the pH of the system at about 8.5, so that the precipitation reaction is complete. The suspension is centrifugally filtered, and the filter residue is returned as iron ore sinterin...

Embodiment 3

[0019] Take 400kg of sintered ash containing 8% potassium at room temperature, add it to 2000L industrial water (solid-to-liquid ratio is 1:5), and add 2kg of dispersant therein, and then stir at 80r / min for 30min. After the stirring is completed, the sintered ash suspended slurry is centrifugally filtered, and the obtained filtrate is used for circulating water to elute potassium four times according to the above method, and the obtained filter residue is mixed as iron ore sintering material. Extract the filtrate with a pH value of about 10.5, add 15kg NH therein 4 HCO 3 , 40kg of industrial coke powder with a particle size of 70 mesh, stirred at 80r / min for 12min to remove impurities and decolorize the solution. Add 3.0kg of industrial KOH caustic soda with a content of 85% during the stirring process to keep the pH of the system at about 8.5, so that the precipitation reaction is complete. The suspension is centrifugally filtered, and the filter residue is returned as iro...

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Abstract

The invention discloses a method for recovering potassium elements from sintering ashes of steel and iron works and preparing potassium sulfate. The method comprises the following main steps of: A. removing potassium by adopting a circulating industry washing leaching solution mode, and carrying out solid-liquid separation on suspension liquid by adopting a centrifugal filtration or centrifugal precipitation mode; B. adding NH4HCO3 into the potassium removing solution for removing impurities, and adding active carbon or industrial coke powder for decoloration; and C. adding industrial (NH4)2SO4 for evaporation and crystallization to prepare the potassium sulfate. The invention can completely eliminate corrosion caused by circulating gathering of alkali metal of potassium, sodium and the like in the iron-making blast furnace and the adverse effects on sintering electric dedusting system efficiency and the like when the sintering ashes are reused as ingredients directly, and simultaneously realize high-efficiency recycling of the potassium resource.

Description

field of invention [0001] The invention relates to a method for recovering potassium chloride and preparing potassium sulfate from sintered ashes of iron and steel plants, which belongs to the production technology of potassium salt and also belongs to the solid waste treatment technology of iron and steel metallurgical enterprises. Background technique [0002] Iron ore sintering is an important link in steel production. Sintering ash is the abbreviation and common name of the dust particles collected by the sintering head flue gas electrostatic precipitator during the iron ore sintering process of the iron and steel plant. Its production accounts for about 1% to 2% of the output of sinter ore, and the sinter ash produced in China is as high as 10 million tons every year. At present, the comprehensive utilization of sintered ash in China is mainly realized by directly remixing sintered ash for reuse. Due to the different sources of iron ore, some ore raw materials contain...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D5/00C05D1/02C05G1/00
Inventor 刘宪杨运泉杨帆沈毅蒋新民
Owner HUNAN VALIN XIANGTAN IRON & STEEL CO LTD
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