A kind of device and method improving ore deposit or the recovery of flue gas during smelting Sulphuric acid Low Temperature Thermal

A kind of device and method improving ore deposit or the recovery of flue gas during smelting Sulphuric acid Low Temperature Thermal

  • CN 105,236,360 B
  • Filed: 11/17/2015
  • Issued: 08/17/2016
  • Est. Priority Date: 11/17/2015
  • Status: Active Grant
First Claim
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1. the method improving ore deposit or the recovery of flue gas during smelting Sulphuric acid Low Temperature Thermal, it is characterised in that:

  • the method comprises the following steps;

    (1) the some or all of flue gas of auto purification workshop section is delivered to the bottom of moisture absorption tower in the future, from moisture absorption tower acid circulating slot concentration be 30~

    70% sulphuric acid be delivered to moisture absorption tower top, the up flue gas of moisture absorption tower bottom and concentration are the sulphuric acid counter current contacting moisture absorption of 30~

    70%;

    Flue gas after moisture absorption and the remaining bottom entering drying tower from purification section flue gas, the absorbing liquid after moisture absorption is back to moisture absorption tower acid circulating slot and recycles;

    (2) by concentration in dry tower acid circulating slot be 92~

    98.5% sulphuric acid be delivered to the top of drying tower, and contact be dried with the back flow of gas entered, dried flue gas removes a conversion system, and dry liquid is back to be dried tower acid circulating slot and recycles;

    (3) gas of 140~

    300 DEG C after a conversion system converts enters the bottom on high temperature absorption tower, gas bottom this reacts from the concentrated sulphuric acid that first order concentration is 99% of blender and the concentrated sulphuric acid counter current contacting that two-stage concentration is 98.5% on top with in the middle part of high temperature absorption tower successively, reaction generates the system that concentration is 99.5 ±

    0.5% acid of 190 ±

    30 DEG C after terminating, the water passing in vaporizer by heat it is delivered in vaporizer after this system acid being pressurizeed, thus produce the low-pressure steam of 0.6 ±

    0.4MPa, it is partly into blender from the system acid of vaporizer output, be passed through in blender simultaneously concentration in moisture absorption tower acid circulating slot be 30~

    70% sulphuric acid adjusting mixer in sulfuric acid concentration to 99%.

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