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Method for producing sulfuric acid from calcium sulfate

A technology of calcium sulfate and calcium sulfate powder, applied in chemical instruments and methods, sulfur compounds, sustainable manufacturing/processing, etc., can solve the problems of waste harmful gas energy consumption, raw material scarcity and high price

Active Publication Date: 2015-05-06
XIANGFU NEW BUILDING MATERIAL HUNAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to overcome the problems of scarcity and high price of raw materials in the existing sulfuric acid production process, the introduction of new impurities due to the use of solid fuels, most of the discharged wastes are harmful gases and high energy consumption, and provide a A kind of method for producing sulfuric acid with calcium sulfate with low production cost

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] This embodiment includes the following steps:

[0020] (1) Grinding block calcium sulfate into calcium sulfate powder with a particle size of 200 mesh;

[0021] Described calcium sulfate is the calcium sulfate of whiteness 99.2%, purity 99.3wt%;

[0022] (2) Put the calcium sulfate powder in step (1) into the high-temperature stirring calciner, seal the feeding port and the discharge port, and raise the temperature of the high-temperature stirring calcining kiln to 1200°C, start the stirring motor, and set the speed at 40rpm ;

[0023] (3) Introduce oxygen with a pressure of 0.1 MPa and a volume concentration of 99% to the bottom of the material in the high-temperature stirring kiln;

[0024] (4) Pass the mixed gas (mixed gas of sulfur dioxide, oxygen, etc.) produced by the internal reaction of the high-temperature stirring calcination kiln into the clustered gas flow channel with a built-in powdery alum pentoxide catalyst from the top of the high-temperature stirring...

Embodiment 2

[0031] This embodiment includes the following steps:

[0032] (1) Grinding granular calcium sulfate into calcium sulfate powder with a particle size of 1200 mesh;

[0033] Described calcium sulfate is the calcium sulfate of whiteness 99.2%, purity 99.3wt%;

[0034] (2) Put the calcium sulfate powder in step (1) into the high-temperature stirring kiln, seal the feeding port and discharge port, raise the temperature of the high-temperature stirring calcining kiln to 1500°C, start the stirring motor, and set the speed at 45rpm ;

[0035] (3) Introduce oxygen with a pressure of 0.05 MPa and a volume concentration of 99% to the bottom of the material in the high-temperature stirring kiln;

[0036] (4) Pass the mixed gas (mixed gas of sulfur dioxide, oxygen, etc.) produced by the internal reaction of the high-temperature stirring calcination kiln into the clustered gas flow channel with a built-in powdery alum pentoxide catalyst from the top of the high-temperature stirring calcin...

Embodiment 3

[0043] This embodiment includes the following steps:

[0044] (1) Grinding granular calcium sulfate into calcium sulfate powder with a particle size of 3000 mesh;

[0045] Described calcium sulfate is the calcium sulfate of whiteness 99.2%, purity 99.3wt%;

[0046] (2) Put the calcium sulfate powder in step (1) into the high-temperature stirring calcination kiln, seal the feeding port and discharge port, raise the temperature of the high-temperature stirring calcination kiln to 800°C, start the stirring motor, and set the speed at 45rpm ;

[0047] (3) Introduce oxygen with a pressure of 0.15 MPa and a volume concentration of 99% to the bottom of the material in the high-temperature stirring kiln;

[0048] (4) Pass the mixed gas (mixed gas of sulfur dioxide, oxygen, etc.) produced by the internal reaction of the high-temperature stirring calcination kiln into the clustered gas flow channel with a built-in powdery alum pentoxide catalyst from the top of the high-temperature st...

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Abstract

A method for producing sulfuric acid from calcium sulfate comprises the following steps of: (1) smashing calcium sulfate; (2) putting the calcium sulfate powder into a high-temperature stirring calcining kiln, raising the temperature and starting a stirring motor; (3) introducing nitrogen to the bottom of the material in the high-temperature stirring calcining kiln; (4) introducing the mixed gas generated from the reaction into a cluster gas flow channel in which a powdery catalyst is held, and maintaining the temperature of the flow channel at 500-1000 DEG C; (5) introducing the discharged gas to the bottom of an absorption tower and spraying concentrated sulfuric acid from the top of the absorption tower; (6) mixing the mixed gas discharged from the absorption tower with the gas generated through reaction inside the high-temperature stirring calcining kiln and then introducing the mixed gas into the cluster gas flow channel; and (7) discharging solid residues from the discharge hole at the bottom of the high-temperature stirring calcining kiln. With the method provided by the invention, the whole reaction process of producing sulfuric acid from calcium sulfate is completely closed without introducing secondary pollution impurities; besides, no harmful gas sulfur dioxide is emitted to the atmosphere; the method is energy-saving and environment-friendly; and the absorption rate of sulfur dioxide may be 100%.

Description

technical field [0001] The invention relates to a method for producing sulfuric acid, in particular to a method for producing sulfuric acid with calcium sulfate. Background technique [0002] At present, most sulfuric acid production in my country is made of sulfuric acid and pyrite ore. With the rising price of sulfur and pyrite raw materials, the cost of sulfuric acid production is gradually increasing. It is imperative to find new raw materials and new processes to produce sulfuric acid. [0003] Chinese invention patent application 200910019882.5 discloses a technology for producing sulfuric acid using magnesium sulfate, which mainly adopts the technology of preheating the raw material of magnesium sulfate by suspension calcination and sulfur dioxide flue gas reuse, and adopts the "two-turn and two-suction" process at the same time, which improves the to SO 3 Gas absorption rate, but new fuel is introduced in the process, introducing possible foreign impurities. [000...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B17/775C01B17/50
CPCY02P20/10
Inventor 刘立文刘珍如宁爱民宁勇宁江天刘勇鲁纪鸣
Owner XIANGFU NEW BUILDING MATERIAL HUNAN