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Techlogogy for making alpha semi-water desulfur gypsum using normal pressure salt solution method

A technology of semi-aqueous desulfurization gypsum and desulfurization process is applied in the field of utilization of by-products of flue gas desulfurization, which can solve the problems of little effective information and achieve the effects of easy control, high reliability and low production cost.

Inactive Publication Date: 2004-07-21
ZHEJIANG TIANLAN ENVIRONMENTAL PROTECTION TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This patented technology allows for efficient use of sulfur dioxide (SO2) emissions from coal fired power plants without requiring significant modifications on their infrastructure. It also includes processes like acid mist precipitation, dehumidification, and dry cleanup steps along its way through multiple stages before being released into atmosphere. Overall, this innovation improves efficiency while reducing costs associated therewith.

Problems solved by technology

Technological Problem addressed in this patents relating to improving the efficiency and effectiveness of calcining processes involving calcium hydroxide (CaOH) without causing environmental concerns due to their use. Current solutions involve adding an acidifying agent like ammonium nitrogen trisilicate(ANTS), but these treatments have drawbacks including poor control over the formation of alpha hydrocartzcite during decomposition and difficulty controlling the beta phase content within the final product. Additionally, current methods require large amounts of expensive equipment and consume significant power supply while generating unwanted side effects on environment quality.

Method used

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  • Techlogogy for making alpha semi-water desulfur gypsum using normal pressure salt solution method
  • Techlogogy for making alpha semi-water desulfur gypsum using normal pressure salt solution method

Examples

Experimental program
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Effect test

Embodiment 1

[0031] The gypsum extracted from the sedimentation tank of the flue gas desulfurization system has not been washed, and the slurry concentration is about 10-20%. The slurry can be directly sent to the oxidation tank or the buffer tank, and then the slurry is sent to the gypsum treatment process to modify the gypsum . The slurry first enters the oxidation tank, the pH in the oxidation tank is about 4, and press 40Nm 3 Air / m 3 The proportion of the slurry is fed into the air to promote the complete oxidation of the desulfurized gypsum at a temperature of about 40°C. The completely oxidized gypsum enters the thickener to be thickened to 50% and is sent to the slurry tank. The solid concentration of the slurry in the slurry tank is about 10%, the total concentration of the crystal mordant is 10%, and the composition is: CaCl 2 8%, succinic acid 1%, glycerol 1%. After being uniformly mixed, the temperature is raised to 80°C by the heat exchanger, and then it enters the evaporation tank...

Embodiment 2

[0033] The gypsum extracted from the sedimentation tank of the flue gas desulfurization system has not been washed, and the slurry concentration is about 10-20%. The slurry can be directly sent to the oxidation tank or the buffer tank, and then the slurry is sent to the gypsum treatment process to modify the gypsum . The slurry first enters the oxidation tank, the pH in the oxidation tank is about 5, and press 40Nm 3 Air / m 3 The proportion of the slurry is sent to the flue gas in the desulfurization process to promote the complete oxidation of the desulfurized gypsum at a temperature of about 40°C. The completely oxidized gypsum enters the thickener to be thickened to 50% and is sent to the slurry tank. The slurry solid concentration in the slurry tank is about 10%, the total concentration of the crystal mordant is 5%, and the composition is: MgCl 2 4%, succinic acid 0.5%, glycerol 0.5%, mixed uniformly, heated to 80°C through a heat exchanger, and then enters the evaporation tank...

Embodiment 3

[0035] The gypsum extracted from the sedimentation tank of the flue gas desulfurization system has not been washed, and the slurry concentration is about 10-20%. The slurry can be directly sent to the oxidation tank or the buffer tank, and then the slurry is sent to the gypsum treatment process to modify the gypsum . The slurry first enters the oxidation tank, the pH in the oxidation tank is about 6, and press 40Nm 3 Air / m 3 The proportion of the slurry is fed into the air to promote the complete oxidation of the desulfurized gypsum at a temperature of about 40°C. The completely oxidized gypsum enters the thickener to be thickened to 50% and is sent to the slurry tank. The slurry solid concentration in the slurry tank is about 10%, and the total concentration of crystal mordant is 15%. The composition is: KCl 11%, succinic acid 4%. After mixing, the mixture is heated to 60℃ by the heat exchanger and then enters the upper part of the crystallizer. Evaporation tank. The evaporation ...

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Abstract

A process for preparing the desulfurized alpha-semi-hydrated gypsum by ordinary-pressure salt solution method includes oxidizing the deposited calcium sulfite slurry generated by desulfurizing fume, thickening, adding salt solution, mixing, crystallizing, centrifugal solid-liquid separation washing and drying. The washing water is evaporated to obtain concentrated salt solution for reuse.

Description

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Claims

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Application Information

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Owner ZHEJIANG TIANLAN ENVIRONMENTAL PROTECTION TECH
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