Method for preparing flue gas desulfurization powder adsorbent from liquid-solid wastes

A technology for desulfurization powder and waste, applied in separation methods, chemical instruments and methods, alkali metal compounds, etc., can solve problems such as classification and recovery of metal elements, difficulty in purification, damage to acid-base balance of water quality, metal pollution, etc., to achieve improved catalytic performance Effects of reaction rate, micropore integrity, and increased desulfurization rate

Active Publication Date: 2021-06-04
WUHAN KELIN FINE CHEM
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Problems solved by technology

Copper electrolysis wastewater contains a large amount of sulfuric acid, copper, nickel, iron, and trace metal cations such as cobalt, zinc, and manganese. It is difficult to sort, recover, and purify the metal elements in it. Random discharge will easily cause metal pollution and damage to the soil. Water quality acid-base balance
[0006] Summarize the current status of flue gas desulfurization and solid-liquid pollution: there is a lack of a desulfurization powder adsorbent that can be directly desulfurized in dry dust removal (bag dust removal) or a dry desulfurization powder adsorbent suitable for semi-dry desulfurization process, At the same time, the desulfurization waste residue will not affect the reuse of the fly ash collected by dry dust removal and will not cause secondary pollution; the environmental pollution problems and comprehensive utilization of calcium carbide slag slurry and copper electrolysis wastewater

Method used

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  • Method for preparing flue gas desulfurization powder adsorbent from liquid-solid wastes

Examples

Experimental program
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Effect test

Embodiment 1

[0025] Raw material: copper electrolysis wastewater 1, in which Cu 2+ The concentration is 25.8g / L, Ni 2+ The concentration is 11.4g / L, Fe 3+ The concentration is 8.3g / L, H 2 SO 4 The concentration is 179.6g / L; the main components of depotassiation soot are 30.12wt% manganese, 12.35wt% zinc, 3.90wt% iron, 30.79wt% oxygen, 15.71wt% silicon, and 7.13wt% others; calcium carbide slag slurry, moisture 42.4 wt%, calcium hydroxide 55.84wt%, other 1.76wt%.

[0026](1) Liquid-solid separation of calcium carbide slag slurry was carried out with a centrifuge to obtain milk of lime and calcium carbide slag; (2) Under the condition of continuous stirring at a stirring speed of 300rpm, 1000g of copper electrolysis wastewater was added to the reactor and heated to 60°C, Then slowly add 100g of 120 mesh depotassium soot ash, and after acidolysis reaction for 1.0h, centrifuge and wash to obtain acidolysis residue and sulfate solution; (3) under the condition of continuous stirring at a sti...

Embodiment 2

[0030] Raw materials: the same as the depotassium soot ash and carbide slag slurry described in the above examples; copper electrolysis wastewater 2, wherein Cu 2+ The concentration is 48.7g / L, Ni 2+ The concentration is 18.9g / L, Fe 3+ The concentration is 4.2g / L, H 2 SO 4 The concentration is 247.4g / L.

[0031] (1) Liquid-solid separation of calcium carbide slag slurry was carried out with a centrifuge to obtain milk of lime and calcium carbide slag; (2) Under the condition of continuous stirring at a stirring speed of 500rpm, 1000g of copper electrolysis wastewater was added to the reactor and heated to 70°C, Then slowly add 300g of 120 mesh depotassium soot ash, and after 3.0h of acid hydrolysis reaction, centrifuge and wash to obtain acid hydrolysis residue and sulfate solution; (3) under the condition of continuous stirring at a stirring speed of 1000rpm, add Add the milk of lime separated in step (1) to adjust the pH value of the solution to 11 in the sulfate solutio...

Embodiment 3

[0035] Raw materials: the same as the copper electrolysis wastewater 2, ferromanganese desulfurizer saturated sulfur waste residue, and carbide slag slurry described in the above-mentioned embodiments and comparative examples.

[0036] (1) Liquid-solid separation of calcium carbide slag slurry was carried out with a centrifuge to obtain milk of lime and calcium carbide slag; (2) Under the condition of continuous stirring at a stirring speed of 400rpm, 1000g of copper electrolysis wastewater was added to the reactor and heated to 80°C, Then slowly add 200g of 80 mesh ferromanganese desulfurizer saturated sulfur capacity waste residue, and after acidolysis reaction for 2.0h, centrifuge and wash to obtain acidolysis residue and sulfate solution; (3) under the condition of continuous stirring at a stirring speed of 750rpm, to Add the milk of lime separated in step (2) to the sulfate solution obtained in step (1) to adjust the pH value of the solution to 10, conduct a precipitation ...

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Abstract

The invention discloses a method for preparing a flue gas desulfurization powder adsorbent from liquid-solid wastes, which comprises the following steps of: performing acidolysis on ferromanganese solid wastes by using copper electrolysis wastewater, and separating to obtain a sulfate solution; then removing sulfate ions in the sulfate solution by using lime milk and acid, and separating to obtain a metal salt solution; adding carbide slag into the metal salt solution for precipitation reaction, standing for aging, and separating to obtain a gelatinous product; and finally, drying, calcining, crushing and finely grinding the gel to obtain the desulfurization powder adsorbent. The active components of the desulfurization powder adsorbent prepared by the method are CaO and MnO, and the auxiliaries are Fe3O4 and ZnO; the catalyst contains catalytic active components CuO and NiO, and can catalyze SO2 and O2 in the flue gas to react to generate SO3; the desulfurization powder adsorbent is small in particle size, complete in micropores, large in pore volume and high in desulfurization activity; and the method is suitable for dry dedusting device desulfurization or flue gas spray drying desulfurization, does not need a desulfurization packed tower, and reduces the investment cost of enterprises.

Description

technical field [0001] The invention belongs to the field of flue gas desulfurization, and relates to a method for preparing a flue gas desulfurization agent in brief, and specifically relates to a method for preparing a flue gas desulfurization powder adsorbent by using solid and liquid waste, which is suitable for dry dust removal (Bag dust removal) device desulfurization, can also be used in semi-dry method (spray drying method) desulfurization device, without desulfurization packing tower. Background technique [0002] Rich in coal, poor in oil and less in natural gas is my country's special geological energy structure, which determines the current situation of my country's coal as the main energy source. At present, coal consumption in my country accounts for about 75% of primary energy consumption, which is more than twice the world average level, of which 80% of coal is used for direct combustion; at the same time, the sulfur content in coal in my country is generally...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/08B01J20/30B01J20/28B01D53/02B01D53/86B01D53/50
CPCB01J20/041B01J20/0222B01J20/08B01J20/0244B01J20/28014B01D53/02B01D53/8609B01D2255/20753B01D2255/20761Y02P10/20
Inventor 张先茂郑峰伟王国兴王泽王瑜陈凯周正金建涛瞿玖
Owner WUHAN KELIN FINE CHEM
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