A kind of method for producing sulfuric acid from gypsum

A technology of gypsum and sulfuric acid, which is applied in chemical instruments and methods, sulfur compounds, inorganic chemistry, etc., can solve the problems of low gypsum conversion rate, high production cost, and high calcination decomposition temperature, so as to reduce production cost, make the reaction easy to occur, and roast The effect of low temperature

Inactive Publication Date: 2016-04-13
刘立文
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The disadvantages are: (1) The raw material gypsum and coke are both solid, the solid-solid reaction rate is relatively slow, and the conversion rate of gypsum is relatively low; (2) The calcination decomposition temperature is relatively high, specifically 900-1250°C , high energy consumption and high production cost; (3) In order to avoid the occurrence of side reactions, it is necessary to control the weak oxidizing atmosphere in the furnace, which is troublesome to operate

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  • A kind of method for producing sulfuric acid from gypsum
  • A kind of method for producing sulfuric acid from gypsum
  • A kind of method for producing sulfuric acid from gypsum

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Embodiment 1

[0020] This embodiment includes the following steps:

[0021] (1) Put natural gypsum powder with a purity of 98.5wt% in a roasting device, raise the temperature to 800°C, and then continuously feed methane gas into the roasting device to react with gypsum. The molar ratio of methane gas to gypsum is 1:4.05, react for 25 minutes, generate sulfur dioxide, carbon dioxide, water vapor and a solid whose main component is calcium oxide;

[0022] (2) Pass the mixed gas of sulfur dioxide, carbon dioxide and water vapor obtained in step (1) through the dust collector and fill it with CaCl 2 Powder drying pipeline to remove dust and water vapor, and then pass the mixed gas into the condensation tube with a temperature of -15°C, and the remaining mixed gas passes through the sodium hydroxide solution with a concentration of 55wt% and then re-introduces step (1) In the calcination device, sulfur dioxide is liquefied through the condenser tube and then passed into the oxidation chamber co...

Embodiment 2

[0025] This embodiment includes the following steps:

[0026] (1) Put the calcium sulfate-based waste produced in industrial production in a roasting device, raise the temperature to 850°C, and then continuously feed methane gas into the roasting device to react with gypsum. The methane gas and gypsum The molar ratio is 1:4.2, and the reaction takes 40 minutes to generate sulfur dioxide, carbon dioxide, water vapor and a solid whose main component is calcium oxide;

[0027] (2) Pass the mixed gas of sulfur dioxide, carbon dioxide and water vapor obtained in step (1) through the dust collector and fill it with CaCl 2 Powder drying pipeline to remove dust and water vapor, and then pass the mixed gas into the condenser with a temperature of -20°C, and the remaining mixed gas passes through the 60wt% sodium hydroxide solution and then re-passes into step (1) Sulfur dioxide is liquefied by the condenser tube and then passed into the oxidation chamber containing the divanum pentoxi...

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Abstract

The invention discloses a method for producing sulfuric acid by using gypsum. The method comprises the following steps of: (1) putting gypsum powder into a roasting device, heating the temperature to a range between 700 and 850 DEG C, and continually introducing methane gas into the roasting device to react with the gypsum, wherein the molar ratio of the methane gas to the gypsum is 1: (4-4.2); and (2) sequentially introducing the mixed gas of generated sulfur dioxide, carbon dioxide and water vapor into a dust remover and a drying pipeline, then introducing the mixed gas to a condensation pipe of less than 10 DEG C below zero, introducing the rest mixed gas into a sodium hydroxide solution of which the concentration is more than or equal to 50 weight percent, newly introducing the mixed gas into the roasting device, introducing the sulfur dioxide liquefied through the condensation pipe into an oxidation chamber containing a vanadium pentoxide catalyst to convert the sulfur dioxide into sulfur trioxide at the temperature between 500 and 900 DEG C, finally introducing the generated sulfur trioxide into concentrated sulfuric acid of which the concentration is more than or equal to 75 percent, and thus obtaining the sulfuric acid. The roasting temperature in the method is lower than that in other methods for preparing the sulfuric acid by using calcium sulfate, and the method is low in energy consumption and can reduce the production cost.

Description

technical field [0001] The invention relates to a method for producing sulfuric acid, in particular to a method for producing sulfuric acid from gypsum. Background technique [0002] my country is a country lacking in sulfur resources, and the annual consumption of sulfuric acid is quite large. At the same time, the sulfur-containing waste produced in some industrial production in our country also seriously restricts the development of production. [0003] my country is rich in gypsum reserves, about 100 billion tons have been proven, plus the sulfur-containing waste residues in the production of phosphoric acid and other products, it is an astonishing data. Therefore, the production of sulfuric acid from gypsum can effectively solve the problem of lack of sulfur resources in my country. [0004] CN102838153A disclosed a method for producing sulfuric acid and calcium oxide by decomposing gypsum on December 26, 2012. The method uses gypsum and coke as raw materials, and pre...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B17/74C04B7/34
Inventor 刘立文刘珍如宁爱民宁勇宁江天刘勇鲁纪鸣
Owner 刘立文
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