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Method for preparing sulfuric acid by iron pyrite

A technology of pyrite and sulfuric acid, applied in chemical instruments and methods, sulfur compounds, inorganic chemistry, etc., can solve the problems of incomplete purification of furnace gas, difficult management and control, low sulfur burn-out rate, etc., and achieve the suppression of sulfuric acid mist particles Formation, improve product quality, improve the effect of burning out rate

Active Publication Date: 2013-09-18
FUJIAN YONGJING TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The production of sulfuric acid from pyrite is the main sulfuric acid production method, but the traditional sulfuric acid production process from pyrite has low sulfur burn-out rate, incomplete furnace gas purification, SO 2 Problems such as low conversion rate, difficulty in controlling the acid mist generated during the preparation process, and difficulty in management and control during the preparation process

Method used

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  • Method for preparing sulfuric acid by iron pyrite

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] Send the pyrite with 48% sulfur content and 10% water content continuously and evenly to the fluidized fluidized furnace through the belt feeder, use the air blower to introduce air into the fluidized fluidized furnace, and control the oxygen content at the outlet of the fluidized fluidized furnace through the oxygen meter installed at the waste heat boiler According to the oxygen content, the amount of ore added to the fluidized fluidized furnace is adjusted, the oxidation roasting temperature is 850 ° C, and the pressure is 10 mm H 2 O, roasting for 15 minutes, the slag after oxidation and roasting is discharged from the overflow port of the fluidized fluidized furnace, enters the submerged cooling drum to cool down and increase humidity, and then is transported to the slag yard by a belt conveyor. SO in the outlet furnace gas 2 The volume fraction of the waste heat boiler is 13%. The generated furnace gas is passed through the waste heat boiler to reduce the temperat...

Embodiment 2

[0054] Send the pyrite with 48% sulfur content and 10% water content continuously and evenly to the fluidized fluidized furnace through the belt feeder, use the air blower to introduce air into the fluidized fluidized furnace, and control the oxygen content at the outlet of the fluidized fluidized furnace through the oxygen meter installed at the waste heat boiler , according to the oxygen content to adjust the amount of ore added to the fluidized furnace, the oxidation roasting temperature is 900 ° C, the pressure is 1mm H 2 O, roasting for 8 minutes, the slag after oxidation and roasting is discharged from the overflow port of the fluidized fluidized furnace, enters the submerged cooling drum to cool down and increase humidity, and then is transported to the slag yard by a belt conveyor. SO in the outlet furnace gas 2 The volume fraction of the waste heat boiler is 13%. The generated furnace gas is passed through the waste heat boiler to reduce the temperature of the furnace...

Embodiment 3

[0056] Send the pyrite with 48% sulfur content and 10% water content continuously and evenly to the fluidized fluidized furnace through the belt feeder, use the air blower to introduce air into the fluidized fluidized furnace, and control the oxygen content at the outlet of the fluidized fluidized furnace through the oxygen meter installed at the waste heat boiler According to the oxygen content, the amount of ore added to the fluidized fluidized furnace is adjusted, the oxidation roasting temperature is 920 ° C, and the pressure is 5 mm H 2 O, roasting for 10 minutes, the slag after oxidation and roasting is discharged from the overflow port of the fluidized fluidized furnace, enters the submerged cooling drum to cool down and increase humidity, and then is transported to the slag yard by a belt conveyor. SO in the outlet furnace gas 2 The volume fraction of the waste heat boiler is 13%. The generated furnace gas is passed through the waste heat boiler to reduce the temperatu...

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Abstract

The invention relates to a method for preparing sulfuric acid by iron pyrite. The method comprises the steps of oxidizing roasting, flue gas cleaning, drying and conversion absorption steps, wherein the flue gas cleaning step comprises primary cooling, dedusting, pickling, secondary cooling and demisting treatment, and the conversion absorption step adopts 'three plus two' twice conversion and twice absorption. Compared with the prior art, the method has the following advantages that the burning rate of sulfur can be improved; the production of diluted acid can be reduced; while the production cost is lowered, the total conversion rate of SO2 is ensured to be greater than 99.7%, and Sox in the tail gas can be ensured to be emitted by standard; the formation of sulfuric acid mist grains can be effectively inhibited, the grain size of the mist grains can be increased so as to demist; the working efficiency and product quality can be improved; and the formation of the acid mist can be effectively controlled, the product quality can be improved, and the emission of the tail gas pollutant can be reduced.

Description

technical field [0001] The invention relates to the field of chemical production, in particular to a method for preparing sulfuric acid from pyrite. Background technique [0002] Sulfuric acid (H 2 SO 4 ) is a strong acid with a molecular weight of 98.078 and a density of 1.8305g / cm 3 , Concentrated sulfuric acid is a colorless and transparent liquid that can be mixed with water or ethanol, and quickly absorbs moisture in the air when exposed to the air. Sulfuric acid can be used as a raw material for the production of chemical fertilizers, inorganic salts, synthetic fibers, dyes, medicine and food industries, as well as for the manufacture of explosives and smoke agents. It can also be used for refining petroleum products, pickling in the smelting industry, and Dyeing and bleaching etc. [0003] Sulfuric acid production from pyrite is the main sulfuric acid production method, but the traditional sulfuric acid production process from pyrite has low sulfur burn-out rate, ...

Claims

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Application Information

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IPC IPC(8): C01B17/76
Inventor 徐荣春张行应吴云秀
Owner FUJIAN YONGJING TECH CO LTD
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