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Method for recovering sulfur and co-producing calcium carbonate from desulphurization gypsum

A technology for desulfurizing gypsum and calcium carbonate, which is applied in the fields of calcium carbonate/strontium/barium, chemical instruments and methods, hydrogen sulfide, etc. It can solve problems such as key technologies that have not been made public, achieve reduced mining, realize circular economy, and reduce investment and operating costs Effect

Inactive Publication Date: 2009-01-07
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, the key technology of the process has not been disclosed

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Example 1: Dry the desulfurized gypsum at 90-120°C for 5 hours, remove free water, and grind it to less than 120 mesh; take 100g of dried desulfurized gypsum and place it in a quartz tube and put it into a tube that has been raised to 850°C In the electric resistance furnace, the temperature is raised to 900°C, and the time for controlling the temperature of the material to rise to the specified temperature is less than 15S. After the rapid temperature rise is realized, CO is introduced at 900°C for 6 hours, and the gas rate of CO addition is controlled at 1.2-1.5 m / s; After the reaction, lower the temperature of the tubular resistance furnace to 50-70°C and then use hydrogen sulfide to molar ratio CaS:H 2 S=1:2 extraction for 1 hour, and then into the 2 80-90%, H 2 The industrial waste gas of O 4-12% (volume percent) reacts 5 hours; The H produced 2 S concentration is 6-16% (v%) gas 1-2% (volume percentage) recycling, the rest is obtained by oxidation reaction SO 2 ...

Embodiment 2

[0026] Example 2: Dry the desulfurized gypsum at 90-120°C for 6 hours, remove free water, and grind it to less than 120 mesh; take 100g of dried desulfurized gypsum and 3g Fe 2 o 3 1. Mix 1g of lanthanide rare earth ore evenly and place it in a quartz tube into a tube-type resistance furnace that has been raised to 850°C, and then raise the temperature to 1000°C. The time for controlling the temperature of the material to rise to the specified temperature is less than 15S. After rapid heating, Feed CO to react at 1000°C for 4 hours, and the gas velocity of CO addition is controlled at 1.2-1.5m / s. After the reaction, the temperature of the tubular resistance furnace was lowered to 60°C;2 S=1:3 extraction for 1 hour, and then into the 2 80-85%, H 2 The industrial waste gas of O 7-10% (volume percent) was reacted for 5 hours, and the H produced concentration was 8-16% (v%) 2 2-5% (volume percentage) of S gas is recycled, and the analysis and measurement of CaCO in the solid af...

Embodiment 3

[0027] Embodiment 3: H produced by embodiment 2 2 S gas is connected to a quartz tubular reactor with an aspect ratio of 7-15:1, and the reaction temperature is controlled at 70-100°C, while the molar ratio of H 2 S:O 2 =1:2-4, flow velocity 1.2-1.5m / s into O 2 react to get SO 2 . h 2 The conversion rate of S reaches 95%.

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PUM

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Abstract

The invention relates to a method for recycling calcium carbonate from free gypsum dehydration in co-production. The method comprises the steps of taking carbon monoxide as a reducing agent to replace a solid carbon reducing agent to prepare calcium sulfide from desulfurization slag; further generating SO2; taking SO2 as sulphuric acid to produce a feed gas to recycle sulfur resources; at the same time, adding metal oxide, a rare earth compound, coupling metal oxide, etc. as catalysts; and promoting the reduction reaction by catalytic reduction method. Limestone obtained after desulfurization is returned to be used as a desulfurizer so as to recycle the free gypsum dehydration, and to reduce natural gypsum dehydration mining and protect the environment. The method is suitable for the free gypsum dehydration produced in a coal-fired industry, and for the free gypsum dehydration produced by desulfurization of kiln gas.

Description

1. Technical field [0001] The invention relates to a method for recovering sulfur from desulfurized gypsum and co-producing calcium carbonate, which belongs to the technical field of chemical preparation. 2. Background technology [0002] As environmental protection requirements become more and more stringent, SO in flue gas 2 Emission controls are also getting stricter. According to the "Reply of the State Council on Relevant Issues Concerning Acid Rain Control Areas and Sulfur Dioxide Pollution Control Areas", by 2010, the total emission of sulfur dioxide will be controlled within the emission level in 2000. Therefore, flue gas desulfurization is an air pollution control measure that coal-fired power plants and boilers must take. [0003] Desulfurization gypsum is the main source of SO pollution in thermal power plants 2 For the treated by-products, flue gas desulfurization methods mainly include wet, semi-dry and dry desulfurization. Theoretically remove one ton of SO...

Claims

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Application Information

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IPC IPC(8): C01F11/18C01B17/16C01B17/50
Inventor 马丽萍宁平
Owner KUNMING UNIV OF SCI & TECH
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