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Method for preparing sulfur trioxide by utilizing gypsum and equipment system thereof

A technology for sulfur trioxide and gypsum, which is applied in the field of sulfur trioxide preparation to achieve the effects of reducing production costs, reducing the greenhouse effect, and being beneficial to industrialized production

Inactive Publication Date: 2009-10-14
杭州卫士实业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

And the method that utilizes phosphogypsum or fluorogypsum to prepare sulfur trioxide has no report

Method used

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  • Method for preparing sulfur trioxide by utilizing gypsum and equipment system thereof
  • Method for preparing sulfur trioxide by utilizing gypsum and equipment system thereof
  • Method for preparing sulfur trioxide by utilizing gypsum and equipment system thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] Embodiment 1——phosphogypsum produces sulfur trioxide (with ammonium bicarbonate method)

[0054] See figure 1 , image 3 . The phosphogypsum is washed twice in the cement pool, mainly to remove the soluble P in the phosphogypsum 2 o 5 , F - After the phosphogypsum precipitates and the organic matter suspended on the water surface, the upper liquid is sucked off to obtain a gypsum slurry mixed with the precipitated phosphogypsum and water (control the water content at ≤ 50%).

[0055] (1) Metathesis reaction: In the reaction kettle 1 with a paddle agitator, 1 part of phosphogypsum (the main component is CaSO 4 2H 2 O content is 82%, without water), adding ammonium bicarbonate (NH 4 HCO 3 content is 98%) 1.2 parts, reacted for 1 hour at a temperature of 30°C to 50°C to obtain calcium carbonate and ammonium sulfate [(NH 4 ) 2 SO 4 ] in aqueous solution.

[0056] (2) Dehydration treatment: filter with belt filter 2, carry out solid and liquid two-phase separatio...

Embodiment 2

[0060] Embodiment 2——Gypsum powder produces sulfur trioxide (with ammonium bicarbonate method)

[0061] (1) Metathesis reaction: 1 part of natural gypsum mineral powder (CaSO 4 2H 2 O content is 88%), particle diameter is below 50um), add ammonium bicarbonate (NH 4 HCO 3 Content is 98%) 1.2 parts. In the reaction kettle 1 with a paddle stirrer, react at a temperature of 30°C to 50°C for 1 hour to obtain calcium carbonate and ammonium sulfate [(NH 4 ) 2 SO 4 ] in aqueous solution.

[0062] (2) Dehydration treatment: filter with belt filter 2, carry out solid and liquid two-phase separation, separate calcium carbonate by-product, and ammonium sulfate aqueous solution enters liquid storage tank II 4.

[0063] (3) Concentration treatment: After the ammonium sulfate aqueous solution was concentrated by the evaporation concentrator 6 equipped with the jet pump 5, 0.68 parts of crystals of ammonium sulfate were obtained.

[0064] (4) Mixing and steaming ammonia treatment: the...

Embodiment 3

[0066] Embodiment 3——Gypsum powder produces sulfur trioxide (adding carbonized ammonia water method)

[0067] See figure 2 , image 3 . Add 2 parts of ammonia, 1 part of carbon dioxide and water to form a saturated solution (unsaturated solution will slow down the reaction speed) by carbonizing tower 10; put 1 part of natural gypsum mineral powder (CaSO 4 2H 2 O content is 90%), and the particle diameter is below 50um) for material preparation.

[0068] (1) Metathesis reaction: 1 part of natural gypsum mineral powder and 3.7 parts of carbonized ammonia water are reacted for 2 hours at a temperature of 30°C to 50°C in a reaction kettle 1 with a paddle stirrer to obtain calcium carbonate (by-product separation ) and ammonium sulfate [(NH 4 ) 2 SO 4 ] Aqueous solution.

[0069] (2) Dehydration treatment: filter with belt filter 2, carry out solid and liquid two-phase separation, separate calcium carbonate by-product, and ammonium sulfate aqueous solution enters liquid st...

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Abstract

The invention relates to a method for preparing sulfur trioxide by utilizing gypsum and an equipment system thereof, aiming to provide a new technology which takes phosphogypsum or fluorine gypsum (also including ordinary gypsum) as raw materials to prepare the sulfur trioxide, and the matched equipment system thereof. The invention comprises the following steps: (1) double decomposition reaction: gypsum slurry is added into ammonium bicarbonate or carbonized ammonia water for reacting to obtain ammonium sulfate solution and calcium carbonate; then the steps of (2) dewater treatment, (3) concentration treatment, (4) mixing ammonia distillation treatment and (5) reductive decomposition reaction are sequentially carried out on the ammonium sulfate solution, and a sulfur trioxide gas product is obtained.

Description

technical field [0001] The invention relates to a method for preparing sulfur trioxide, in particular to a method for preparing sulfur trioxide from gypsum and an equipment system thereof. Background technique [0002] Phosphogypsum and fluorogypsum are wastes of phosphorus chemical industry, which have not been effectively treated and utilized for a long time, and have now been classified as "hazardous wastes". And the method for preparing sulfur trioxide in the prior art, conventional sulfur, sulfur dioxide (CN1384805), oleum (ZL85109395) etc. are raw materials. However, the method for preparing sulfur trioxide by using phosphogypsum or fluorogypsum has not been reported. Contents of the invention [0003] The technical problem to be solved by the present invention is to overcome the deficiencies in the prior art and provide a new technology for preparing sulfur trioxide from phosphogypsum or fluorogypsum (including ordinary gypsum) as raw material. [0004] Another te...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B17/69
Inventor 陈明顺
Owner 杭州卫士实业有限公司
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