Preparation of sulphuric acid

A technology of sulfuric acid and sulfur dioxide, applied in chemical instruments and methods, sulfur compounds, inorganic chemistry, etc., can solve the problems of large production equipment and high operating costs, and achieve the effect of improving heat recovery efficiency, improving production capacity, and reducing volume

Inactive Publication Date: 2009-08-12
NANJING SULFUR SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The low concentration of sulfur dioxide makes the production equipment huge, causing problems such as high operating costs

Method used

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Examples

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Effect test

Embodiment 1

[0024] A set of magnetite acid production equipment, the output of raw sulfuric acid is 60kt / a, by adopting the present invention, the output of sulfuric acid is increased to 100kt / a.

[0025] The specific content of the transformation is: adopt pressure swing adsorption oxygen production device, and the oxygen production capacity is 2000Nm 3 / h. The oxygen produced in the oxygen production equipment is mixed with air in front of the furnace bottom air blower to form a raw material gas, in which the volume concentration of oxygen is 25-35%, and then the raw gas enters the fluidized bed furnace, where the oxygen reacts with pyrite to generate sulfur dioxide gas, which is released In the intermediate gas of fluidized fluidized furnace, the volume concentration of sulfur dioxide is about 18%. The intermediate gas coming out of the fluidized fluidized furnace passes through the waste heat boiler to recover heat energy, removes dust from the dust removal equipment, and enters the ...

Embodiment 2

[0028] A set of zinc concentrate acid production equipment adopts sulfate roasting to produce zinc oxide calcine. By adopting the invention, the output of sulfuric acid is increased from 50kt / a to 75kt / a, and the quality of zinc oxide calcine is improved simultaneously.

[0029] The specific content of the transformation is: adopt pressure swing adsorption to produce oxygen, and the oxygen production capacity is 1500Nm 3 / a. The oxygen produced in the oxygen making equipment is mixed with air in front of the furnace bottom air blower to form a raw material gas, in which the volume concentration of oxygen is 26-36%, and then the raw gas enters the fluidized bed furnace, where the oxygen reacts with the raw material ore to generate sulfur dioxide gas, which exits the fluidized bed furnace In the intermediate gas, the volume concentration of sulfur dioxide increased from about 9.5% to about 15%. The gas leaving the fluidized fluidized furnace passes through the waste heat boile...

Embodiment 3

[0031] One cover pyrite acid production plant, adopt the present invention, sulfuric acid output is 100kt / a, if need invest 58 million yuan with traditional technology, use the present invention instead, equipment volume reduces greatly, has saved civil engineering and equipment cost, reduces The floor area of ​​the device is reduced, and the investment is reduced to 50 million yuan; at the same time, due to the improvement of heat utilization rate, 0.5 tons of steam can be produced for every ton of acid produced, and the power generation of steam can be increased by 90 degrees per ton of acid, and 50 degrees of oxygen production can be deducted The power consumption per ton of acid is better than the traditional process.

[0032] The specific process is: adopt pressure swing adsorption to produce oxygen, and the oxygen production capacity is 2500Nm 3 / a. The oxygen produced in the oxygen production equipment is mixed with air in front of the furnace bottom air blower to form...

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Abstract

The invention provides a method for preparing sulphuric acid, which can effectively accelerate reaction velocity and efficiency, improve heat recovery rate, increase productivity of equipment and reduce the volume of the equipment. The method for preparing sulphuric acid comprises the steps: (1) raw ore is mixed with raw gas containing oxygen for fluidized-bed combustion to obtain intermediate gas of sulfur dioxide and oxygen; (2) the intermediate gas is dried; (3) the sulfur dioxide is transformed; in the step (1), the oxygen concentration of the raw gas is 25-50% (volume). The raw gas is formed by mixing air and oxygen. As the improvement of the invention, the oxygen is supplemented before the step (2), so that the oxygen concentration of the intermediate gas is 10-25%. The invention is the improvement of acid making technique in the process of sulfuric acid production, and has the characteristics that the method can improve the productivity of sulphuric acid making equipment with the same scale, reduce power consumption in the production and can utilize the heat produced in the technical process to the utmost extent. The invention can be used for building new factories and reconstructing old factories.

Description

technical field [0001] The invention relates to a method for preparing sulfuric acid. Background technique [0002] The production process of existing sulfuric acid comprises the following steps: (1) raw material ore is mixed with raw material gas, boiling combustion, (2) intermediate gas is dried and (3) sulfur dioxide conversion, wherein the boiling combustion of raw material ore and supplementary gas before drying all use air . In this process, since most of the air is nitrogen and a small part is oxygen, only oxygen participates in the reaction and nitrogen does not participate in the reaction in the sulfuric acid process. Huge, low heat recovery rate and other issues. For example, in the current pyrite acid production, the boiling furnace uses ordinary air for roasting. Because the oxygen content in the air is relatively low, the concentration of sulfur dioxide leaving the boiling furnace is 10% to 14%, and the concentration of sulfur dioxide entering the converter is...

Claims

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Application Information

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IPC IPC(8): C01B17/74
Inventor 蔡斋如刘汉丁健华
Owner NANJING SULFUR SCI & TECH
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