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Equipment and technique for producing sulfur dioxide by using gypsum

A technology of sulfur dioxide and gypsum, applied in inorganic chemistry, sulfur compounds, chemical instruments and methods, etc., can solve the problems of high manufacturing cost, troublesome operation, low conversion rate, etc. easy effect

Active Publication Date: 2013-04-17
湖南湘湖新型建材有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] CN101513993A disclosed a method for producing sulfuric acid using magnesium sulfate on August 26, 2009. The method mainly adopts the conversion process of suspension calcination, sulfur dioxide flue gas reuse to preheat the magnesium sulfate raw material, and "two transfers and two suctions" , the defect of which is that the method is centered on the calcination and reduction process of magnesium sulfate, and the conversion process of sulfur dioxide through sulfur needs to go through four steps, the reaction process is too cumbersome, and too many steps will increase harmful gas emissions in the production process In addition, a new fuel is introduced in the process, and the obtained sulfur dioxide contains impurities, the purity is low, and the conversion rate is not high, and the equipment used is relatively complicated in structure, troublesome in operation, and high in manufacturing cost

Method used

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  • Equipment and technique for producing sulfur dioxide by using gypsum

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Effect test

Embodiment 1

[0017] refer to figure 1 The equipment for producing sulfur dioxide from gypsum in this embodiment includes a preheating extruder 1, a feeding machine 2, a calcining extruder 7, and a deaerator tank 13 with fine copper powder. The preheating extruder 1 The feed inlet of the preheating barrel 4 is connected with the outlet of the blanking machine 2, and the feed outlet is connected with the feed inlet 8 of the calcining barrel 10 of the calcining extruder 7 through the precursor discharge device 6, and the preheating The rear end of the preheating barrel 4 of the hot extruder 1 is provided with a vacuum exhaust device 5, and the rear end of the calcining barrel 10 of the calcining extruder 7 is provided with an air extraction device 12, and the air extraction device 12 The gas booster pump 11 is connected to the oxygen removal tank 13 containing fine copper powder, and the discharge port of the calcining barrel 10 of the calcining extruder 7 is provided with a discharge device ...

Embodiment 2

[0024] The equipment that utilizes gypsum to produce sulfur dioxide of the present embodiment is the same as embodiment 1.

[0025] The technique of utilizing gypsum to produce sulfur dioxide of the present embodiment comprises the following steps:

[0026] (1) Feed the gypsum powder into the preheating barrel 4 of the preheating extruder 1 through the feeder 2, remove the crystal water at 450°C, convert the crystal water into water vapor and remove it through the vacuum exhaust device 5, and Under the action of the preheating screw 3 of the preheating extruder 1, the material enters the calcining barrel 10 of the calcining extruder 7 through the precursor discharge device 6;

[0027] (2) Calcining the material in the calcining barrel 10 at 1400°C, and decomposing it into sulfur dioxide, oxygen, and calcium oxide. The sulfur dioxide and oxygen obtained enter the 600°C chamber through the air pump 12 under the action of the gas booster pump 11. The oxygen removal tank 13 for f...

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Abstract

The invention discloses equipment and a technique for producing sulfur dioxide by using gypsum. The equipment comprises a preheating extruder, a blanking machine, a calcining extruder and a deoxidizing tank for accommodating fine copper powder, wherein a feeding port of a preheating cylinder of the preheating extruder is connected with an outlet of the blanking machine, and a discharging port is connected with a feeding port of a calcining cylinder of the calcining extruder through a precursor discharging device; a vacuum exhausting device is arranged at the back end of the preheating cylinder of the preheating extruder; an air extractor is arranged at the back end of the calcining cylinder of the calcining extruder, and is connected with the deoxidizing tank which accommodates fine copper powder through an air booster pump; and a discharging port of the calcining cylinder of the calcining extruder is provided with an unloading device. The invention further comprises the technique for producing the sulfur dioxide by using the gypsum. The equipment and the technique have the advantages of simple structure, low production cost and easiness in operation; and the purity of the produced sulfur dioxide is greater than and equal to 99%.

Description

technical field [0001] The invention relates to a device and a process for producing sulfur dioxide, in particular to a device and a process for producing sulfur dioxide by using gypsum. Background technique [0002] At present, sulfuric acid production in my country mostly uses sulfur or pyrite as raw materials, and the key step is to prepare high-purity sulfur dioxide intermediates. With the depletion of sulfur and pyrite resources, the prices of sulfur and pyrite raw materials are also rising, and the production cost of sulfuric acid is gradually increasing. It is imperative to find new raw materials and new processes to produce sulfuric acid. [0003] CN101513993A disclosed a method for producing sulfuric acid using magnesium sulfate on August 26, 2009. The method mainly adopts the conversion process of suspension calcination, sulfur dioxide flue gas reuse to preheat the magnesium sulfate raw material, and "two transfers and two suctions" , the defect of which is that t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B17/50
CPCY02P20/129
Inventor 刘立文刘珍如宁爱民宁勇宁江天刘勇鲁纪鸣
Owner 湖南湘湖新型建材有限公司
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