A method for preparing flue gas desulfurization powder adsorbent by using liquid and solid waste

A technology of desulfurization powder and adsorbent, which is applied in the field of flue gas desulfurization, can solve the problems of classification and recovery of metal elements, difficulty in purification, damage to acid-base balance of water quality, metal pollution, etc., and achieve improved catalytic reaction rate, complete micropores, enlarged The effect of desulfurization rate

Active Publication Date: 2022-05-31
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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  • A method for preparing flue gas desulfurization powder adsorbent by using liquid and solid waste

Examples

Experimental program
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Effect test

Embodiment 1

[0025] Raw material: copper electrolysis wastewater 1, of 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 depotassium fume ash are manganese 30.12wt%, zinc 12.35wt%, iron 3.90wt%, oxygen 30.79wt%, silicon 15.71wt%, others 7.13wt%; 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 with a centrifuge to obtain lime milk and calcium carbide slag; (2) Under the condition of continuous stirring at a stirring speed of 300 rpm, 1000 g of copper electrolysis wastewater was added to the reactor and heated to 60 °C, Then slowly add 100g of 120-mesh depotassium soot, and carry out the acidolysis reaction for 1.0h, then centrifuge and wash to obtain acidolysis residue and sulfate solution; (3) Under the condition of continuous stirring at a stirring spee...

Embodiment 2

[0030] Raw materials: the same as the depotassium soot and calcium carbide slag slurry described in the above embodiment; 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 with a centrifuge to obtain lime milk and calcium carbide slag; (2) Under the condition of continuous stirring at a stirring speed of 500 rpm, 1000 g of copper electrolysis wastewater was added to the reactor and heated to 70 °C, Then slowly add 300g of 120-mesh depotassium soot, and carry out acid hydrolysis for 3.0h, centrifuge and wash to obtain acidolysis residue and sulfate solution; (3) Under the condition of continuous stirring at a stirring speed of 1000rpm, go to step (2) To the separated sulfate solution, the lime milk obtained in step (1) was added to adjust the pH value of the solution to ...

Embodiment 3

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

[0036] (1) Liquid-solid separation of calcium carbide slag slurry with a centrifuge to obtain lime milk and calcium carbide slag; (2) Under the condition of continuous stirring at a stirring speed of 400 rpm, 1000 g 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-containing waste residue, and after acidolysis 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 In the sulfate solution obtained in step (2), the lime milk obtained in step (1) was added to adjust the pH value of the solution to 10, the precipitation r...

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Abstract

The invention discloses a method for preparing flue gas desulfurization powder adsorbent by using liquid solid waste. Firstly, copper electrolysis waste water is used to acidly decompose ferromanganese solid waste, and the sulfate solution is obtained by separation; then, the sulfate is removed by using lime milk and acid Sulphate ions in the solution are separated to obtain a metal salt solution; then calcium carbide slag is added to the metal salt solution for precipitation reaction, left to age, and separated to obtain a gel-like product; finally, the gel is dried, calcined, pulverized, and finely ground to obtain desulfurization powder adsorbent. The active components of the desulfurization powder adsorbent prepared by the method of the present invention are CaO and MnO, and the auxiliary agent is Fe 3 o 4 , ZnO; and contains catalytically active components CuO and NiO, which can catalyze SO in flue gas 2 with O 2 The reaction produces SO 3 ; The desulfurization powder adsorbent has small particle size, complete micropores, large pore volume, and high desulfurization activity; it is suitable for desulfurization of dry dust removal devices or flue gas spray drying desulfurization devices, and does not require desulfurization packing towers, reducing the investment cost of enterprises.

Description

technical field [0001] The invention belongs to the field of flue gas desulfurization, and in brief relates to a preparation method of a flue gas desulfurizer, in particular to a preparation method of a flue gas desulfurization powder adsorbent by using solid-liquid waste, which is suitable for dry dust removal (Bag dust removal) device desulfurization, can also be used for semi-dry (spray drying) desulfurization device, without desulfurization packing tower. Background technique [0002] Rich coal, poor oil and little natural gas are my country's special geological energy structure, which determines the status quo of my country's use of 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, of which 80% is used for direct combustion; at the same time, the sulfur content in my country's coal is generally high . High consumption and high sulfur content lead t...

Claims

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Application Information

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Patent Type & Authority Patents(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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