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Sintering flue gas desulfurization and denitrification material and preparation method thereof

A technology for desulfurization, denitrification, and sintering flue gas, which is applied in separation methods, chemical instruments and methods, gas treatment, etc., can solve problems such as waste of electrolyte and cathode carbon, environmental pollution, etc., and achieves long service life, low cost, and good specific surface area. Effect

Active Publication Date: 2019-11-15
XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, waste cathode carbon blocks are mainly piled up or safely landfilled, which not only wastes expensive electrolyte and cathode carbon, but also brings serious environmental pollution problems.

Method used

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  • Sintering flue gas desulfurization and denitrification material and preparation method thereof
  • Sintering flue gas desulfurization and denitrification material and preparation method thereof

Examples

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preparation example Construction

[0026] refer to figure 1 , the present invention, the preparation method of sintering flue gas desulfurization and denitrification material, comprises the following steps:

[0027] Step 1, using mechanical crushing and fine grinding to pulverize the waste cathode carbon block of aluminum electrolysis;

[0028] Step 2, alkaline leaching the broken aluminum electrolysis waste cathode carbon blocks obtained in step 1, and repeatedly washing the alkali leaching slag with distilled water or deionized water;

[0029] Step 3, placing the waste cathode carbon blocks obtained in step 2 in the cerium-containing impregnation solution for load impregnation, and then drying in an oven for subsequent use;

[0030] Step 4: Carry out high-temperature roasting under an inert atmosphere to the impregnated aluminum electrolysis waste cathode carbon block obtained in step 3, and then cool down to the activation temperature;

[0031] In step five, the high-temperature activated aluminum electrol...

Embodiment 1

[0034] A method for preparing sintered flue gas desulfurization and denitrification materials from waste cathodes of aluminum electrolysis in this embodiment includes the following steps:

[0035] Step 1: Use mechanical crushing and fine grinding to pulverize the waste cathode carbon block of aluminum electrolysis to control the particle size distribution: in terms of mass percentage: the content of particles with a particle size > 11.2 mm is less than or equal to 10%, and the particle size is 8 to 11.2 mm The content of particles with a diameter of mm is greater than or equal to 80%, and the content of particles with a particle diameter of <8mm is less than or equal to 10%;

[0036] Step 2: Perform alkaline leaching of the broken aluminum electrolysis waste cathode carbon block obtained in step 1 with NaOH solution, the concentration of the solute in the NaOH solution is 30%, the leaching time is 2 hours, and the leaching residue is repeatedly washed with distilled water until...

Embodiment 2

[0041] A method for preparing sintered flue gas desulfurization and denitrification materials from waste cathodes of aluminum electrolysis in this embodiment includes the following steps:

[0042] Step 1: Use mechanical crushing and fine grinding to pulverize the waste cathode carbon block of aluminum electrolysis to control the particle size distribution: in terms of mass percentage: the content of particles with a particle size > 11.2 mm is less than or equal to 10%, and the particle size is 8 to 11.2 mm The content of particles with a diameter of mm is greater than or equal to 80%, and the content of particles with a particle diameter of <8mm is less than or equal to 10%;

[0043] Step 2: Alkaline leaching of the broken waste cathode carbon block obtained in step 1 with NaOH solution, the mass concentration of NaOH solution solute is 30%, the leaching time is 3h, and the leaching residue is repeatedly washed with deionized water until the pH is 6;

[0044]Step 3, placing th...

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Abstract

The invention discloses a sintering flue gas desulfurization and denitrification material and a preparation method thereof. The preparation method comprises the following steps: I, performing crushingtreatment on aluminum electrolysis waste cathode carbon blocks through mechanical crushing or a fine grinding method; II, performing alkaline leaching on the crushed waste cathode carbon blocks obtained in the step I, and repeatedly washing leaching dregs as an alkaline leaching sample with distilled water or deionized water; III, performing loading soaking on the alkaline leaching waste cathodecarbon blocks obtained in the step II by using a cerous nitrate solution, and performing drying in a drying oven for later use; IV, performing high-temperature roasting on the waste cathode carbon blocks after soaking in the step III in an inert atmosphere, and performing cooling to an activation temperature; and V, performing vapor high-temperature activation on the high-temperature activated waste cathode carbon blocks obtained in the step IV, and performing slow cooling, so as to obtain the sintering flue gas desulfurization and denitrification material. The material has the characteristicsof being low in cost, good in high temperature resistance, high in strength, rich in micropore, not easy to block and long in service life, and the desulfurization rate is up to 97% or greater and the denitrification rate is up to 90% or greater when a steel sintering flue gas is treated.

Description

technical field [0001] The invention belongs to the technical field of metallurgical engineering, in particular to a sintering flue gas desulfurization and denitrification material and a preparation method thereof. Background technique [0002] The iron and steel industry is the basic industry of the country, and it is also an industry with high energy consumption, high emissions and increased environmental load. Sulfur dioxide emissions from the iron and steel industry account for more than 8% of the total industrial emissions and are still increasing year by year, failing to be effectively curbed. The amount of sulfur dioxide discharged in the sintering process accounts for about 80% of the production system of iron and steel enterprises. Controlling the emission of sulfur dioxide in the production process of sintering machines is the focus of sulfur dioxide pollution control in iron and steel enterprises. As the situation of my country's atmospheric environment becomes m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/20B01J20/28B01J20/30B01D53/02B01D53/86B01D53/60
CPCB01J20/0207B01J20/0296B01J20/08B01J20/20B01J20/28064B01J20/2808B01D53/02B01D53/8637B01D2258/0283
Inventor 刘佰龙张朝晖冯璐孙龙鑫
Owner XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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