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Method for thermally regenerating spent acid

A thermal regeneration and waste acid technology, applied in separation methods, chemical instruments and methods, sulfur trioxide/sulfuric acid, etc., can solve the problems of expensive waste acid treatment and environmental protection requirements restrictions

Inactive Publication Date: 2003-08-06
OUTOTEC OYJ
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

If the spent acid cannot be fed to any other process, such as the production of zinc or fertilizers, or mineral concentration, the spent acid is typically neutralized with lime and introduced into ponds, however the methods of neutralization of spent acid and storage of gypsum are critical for dealing with the problem of spent acid very expensive
Even this measure is in turn limited by new and stricter environmental requirements

Method used

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  • Method for thermally regenerating spent acid
  • Method for thermally regenerating spent acid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] The concentrated spent acid (72%H 2 SO 4 ) is fed into the rising flue of the copper flash smelting furnace with the waste acid generation rate of the whole smelting furnace, namely about 20 liters / min. The spent acid is sprayed into the uptake of the flash smelting furnace in the form of a fine mist through acid-resistant nozzles using compressed air dispersion. The waste acid pressure is 5×10 5 Pa, jet air pressure is 3×10 5 Pa. The test was run for 4 hours. The feed rate of the flash smelting furnace is 80 tons / hour, and the exhaust gas flow into the waste heat boiler is about 20000Nm 3 / h. Measurement of SO in gases after the electrostatic precipitator connected behind the boiler 3 content. The gas temperature in the boiler is reduced by about 25°C. SO 3 The regeneration rate is 90%.

Embodiment 2

[0022] From the test results of the above examples, it can be clearly seen that during the feeding process of spent acid, SO 3 The content does not increase significantly; if the spent acid is not regenerated, it will lead to SO 3 Content increased by about 50g / Nm 3 , SO in exhaust gas from nickel flash smelting furnace 3 The content increased by about 60g / Nm 3 .

[0023] From a technical point of view, the feed of the spent acid injection into the uptake of the flash smelting furnace was performed smoothly, with no signs of wear or corrosion detected in the nozzles.

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Abstract

A process is provided for the thermal decomposition of contaminated sulfuric acid, which was obtained from the scrubbing of sulfur dioxide contaminated gases created in the pyrometallurgical production of metals. According the process the contaminated sulfuric acid is concentrated and fed into the exhaust shaft of a smelting furnace so that the heat of the smelting furnace exhaust gases thermally decomposes the contaminated sulfuric acid.

Description

technical field [0001] The invention relates to a method for thermally regenerating waste acid, which is formed when washing waste gas containing sulfur dioxide produced during high-temperature smelting and metal production. According to this method, the spent acid is concentrated and fed into the gas space of the primary smelting furnace, wherein the energy required for thermal regeneration of the spent acid comes from the heat capacity of the flue gases produced during the smelting process. Background technique [0002] The flue gas produced during the smelting of sulfide ores and concentrates mainly contains sulfur dioxide, heavy metals, arsenic, halogens and other compounds. Since high levels of oxygen in the offgas lead to increased sulfur trioxide formation and further waste acid generation in the scrubbing gas, it is important that the concentrate is as completely combusted as possible and that the oxygen content of the offgas produced during the smelting process is a...

Claims

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Application Information

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IPC IPC(8): B01D53/34B01D53/50B01D53/77C01B17/50C01B17/58C01B17/88C01B17/90
CPCC01B17/503Y02P20/129B01D53/96
Inventor J·泼加伟A·加洛恩J·霍尔米J·奥杰拉
Owner OUTOTEC OYJ
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