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Method and device for removing SO2 in flue gas with copper extracting tailings and recycling copper extracting tailings

A technology for recycling copper tailings, applied in chemical instruments and methods, separation methods, inorganic chemistry, etc., can solve the problems of inconvenient source of raw materials, difficult treatment, and increased non-point source pollution intensity.

Active Publication Date: 2017-02-22
KUNMING UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

Such as air blowing, the SO in the flue gas at the outlet of the reactor 2 The content reaches 7.7%; SO in the oxygen-enriched blast flue gas 2 The content is as high as 15%, and most of the flue gas at the outlet of the reactor is equipped with SO 2 A plant that produces sulfuric acid, but recovers SO 2 After the flue gas still contains high SO 2 , the intensity of non-point source pollution is increasing, and the treatment is more difficult; on the other hand, whether it is the purification of sulfuric acid tail gas or non-point source scattered smoke exhaust gas, the current desulfurization method faces difficulties such as high cost, inconvenient raw material sources, and comprehensive utilization. The development has brought a heavy environmental burden

Method used

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  • Method and device for removing SO2 in flue gas with copper extracting tailings and recycling copper extracting tailings

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0058] In the small experiment, the sulfur dioxide cylinder gas, oxygen cylinder gas and nitrogen cylinder gas were used to distribute gas to simulate copper smelting flue gas. The mass flow meter accurately controlled the gas flow. After the gas distribution was stable, the gas was passed into the pulp for desulfurization reaction. The experimental process A medium constant temperature magnetic stirrer controls the temperature and stirring, and the concentration of sulfur dioxide at the inlet and outlet is detected by the HC-6 trace sulfur and phosphorus analyzer.

[0059] SO 2 Import concentration 2856mg / m 3 , normal temperature, solid-liquid ratio 1:7 (mine tailings 16g, distilled water 112g), oxygen content 8%, gas flow 600~700mL / min, within 43 hours of operation, the desulfurization efficiency of the ore pulp is maintained above 90%.

Embodiment 2

[0061] 300,000 t / a sulfuric acid, sulfuric acid tail gas treatment capacity 100,000Nm 3 / h, SO in exhaust gas 2 Content 2850mg / Nm 3 , the exhaust gas outlet requires SO 2 Content 100mg / Nm 3 . Using secondary desulfurization, the process is as follows figure 1 .

[0062] Sulfuric acid tail gas is pressurized to 0.2~0.3kPa by the pressurized blower 1, sent to the primary desulfurization tower 2 for the first desulfurization, and then into the secondary desulfurization tower 3 for the second desulfurization. The diameter of the desulfurization tower is φ5m, the height is 23.5m, The slurry at the top of the tower needs to be pressurized to 0.25Mpa with circulation pumps 6 and 7 respectively, and the circulation volume is 1500m 3 / h, sent to the tower top nozzle to spray into mist and contact with the flue gas to absorb SO in the flue gas 2 , the liquid-gas ratio is 8L / m 3 , the flue gas after the purification reaches the standard is discharged after demisting by the demister...

Embodiment 3

[0066] 800,000 t / a sulfuric acid, sulfuric acid tail gas treatment capacity 200,000Nm 3 / h, SO in the tail gas of the two-rotation and two-suction sulfuric acid unit 2 Content 800mg / Nm 3 , the exhaust gas outlet requires SO 2 Content 100mg / Nm 3 Below, the desulfurization efficiency is 87.5%. One-stage desulfurization is adopted, and the process refers to figure 1 Just remove the secondary desulfurization tower.

[0067] The sulfuric acid tail gas is pressurized to 0.15-0.2kPa by the pressurized blower 1, and sent to the desulfurization tower. The diameter of the desulfurization tower is 6.2m, and the height is 24.5m. 3 / h, sent to the tower top nozzle to spray into mist and contact with the flue gas to absorb SO in the flue gas 2 , the liquid-gas ratio is 25L / m 3 The flue gas after purification reaches the standard is discharged after demisting by the demister 4; the supplementary amount of copper extraction tailings slurry with a solid content of 15% is 1.5m 3 / h, sen...

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Abstract

The invention relates to a method and device for removing SO2 in flue gas with copper extracting tailings and recycling the copper extracting tailings, and belongs to the technical field of environmental protection. Ferrous metasilicate (Fe2SiO4), magnesium ferrite (MgFe2O4), hedenbergite (CaFeSi2O6) and other sulfur removal active substances in the copper extracting tailings are used for reacting with SO2 in the flue gas in an aqueous solution to generate sulfite, then sulfate is generated under the action of oxygen in the flue gas, the SO2-containing flue gas makes contact with copper extracting tailing slurry, SO2 is absorbed, and thus the flue gas is purified; by adding ammonium sulfide, ammonium bicarbonate and lime milk step by step, iron ions, zinc ions, copper ions, ammonium ions and other ions in the sulfur removal slurry can be resourcelized to be reused.

Description

technical field [0001] The invention relates to a method for extracting copper tailings and removing SO in flue gas 2 And further resources of the method, as well as the device used. Copper extraction tailings are a kind of solid waste discharged in copper smelting, which is used to remove SO in flue gas 2 , to achieve the purpose of treating waste with waste, and also to reuse iron, copper, zinc and other ions in the tailings of copper extraction, belonging to the technical field of environmental protection. Background technique [0002] The main raw material for copper smelting is copper ore. According to relevant literature, as of 2007, the proven reserves of copper mines in my country were 70.48 million tons, of which the basic reserves were 30.7 million tons, accounting for 43.6% of the total reserves, mainly distributed in Jiangxi Five provinces, including Yunnan, Gansu, Hubei, and Shanxi, have utilized resource reserves that account for more than 70% of the country's...

Claims

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Application Information

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IPC IPC(8): B01D53/78B01D53/50C22B7/00C01G49/00
CPCB01D53/502B01D53/78C22B7/006C01G49/00B01D2251/60B01D2251/404B01D2251/402B01D2258/0283Y02P10/20
Inventor 宁平王学谦殷在飞殷梁淘李凯陈茂生王郎郎
Owner KUNMING UNIV OF SCI & TECH
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