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Purification method of sintered flue gas desulfurization gypsum

A technology of desulfurization gypsum and purification method, applied in the direction of solid separation, flotation, etc., can solve the problems of poor dehydration performance, dark color and high impurity content of by-product gypsum, avoid poor separation effect, small investment, and improve whiteness. degree of effect

Active Publication Date: 2011-02-09
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a purification method for sintered flue gas desulfurization gypsum, which overcomes the shortcomings of poor dehydration performance of gypsum slurry, deep color and high impurity content of by-product gypsum in the prior art, and obtains high-grade, high-whiteness desulfurization Gypsum, at the same time, the by-product iron-containing scum can be returned to the sintering process for reuse

Method used

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  • Purification method of sintered flue gas desulfurization gypsum

Examples

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Effect test

Embodiment 1

[0032] Such as figure 1 As shown, the self-flue gas treatment capacity is 57000 Nm 3 In the desulfurization absorption tower of the sintering flue gas desulfurization industrial test device of / h, the sintering flue gas desulfurization gypsum slurry with a concentration of 20% is drawn out, and the gypsum slurry purification test of three-stage reverse flotation is carried out.

[0033]The operating conditions of the primary roughing reverse flotation cell are: the pH value of the slurry is 4.0, the slurry temperature is 40°C, the residence time of the flotation cell is 5min, the collector is tall oil (500g / t), and the inhibitor is sulfuric acid Ammonium (400g / t), pH adjuster is sulfuric acid (250g / t), dispersant is water glass (200g / t), carrier is limestone powder (100g / t).

[0034] The operating conditions of the secondary selective reverse flotation cell are: the pH value of the slurry is 8.0, the temperature of the slurry is 30°C, the residence time of the flotation cell ...

Embodiment 2

[0043] Such as figure 1 As shown, the self-flue gas treatment capacity is 90000m 3 / h sintering flue gas desulfurization industrial test device desulfurization absorption tower, leading the concentration of 12% sintering flue gas desulfurization gypsum slurry, three-stage reverse flotation gypsum slurry purification test.

[0044] The operating conditions of the primary roughing reverse flotation cell are: the pH value of the slurry is 5.2, the slurry temperature is 55°C, the residence time of the flotation cell is 15min, the collector is tall oil (1000g / t), and the inhibitor is sulfuric acid Ammonium (500g / t), pH adjuster is sulfuric acid (200g / t), dispersant is water glass (400g / t), carrier is limestone powder (100g / t).

[0045] The operating conditions of the secondary selective reverse flotation cell are: the pH value of the slurry is 9.5, the temperature of the slurry is 45°C, the residence time of the flotation cell is 25min, the collector is dodecylamine (300g / t), and ...

Embodiment 3

[0054] The self-flue gas treatment capacity is 60000m 3 In the desulfurization absorption tower of the sintering flue gas desulfurization industrial test device of / h, the sintering flue gas desulfurization gypsum slurry with a concentration of 11% is drawn out, and the gypsum slurry purification test of three-stage reverse flotation is carried out.

[0055] The operating conditions of the primary roughing reverse flotation cell are: the pH value of the slurry is 6.0, the slurry temperature is 60°C, the residence time of the flotation cell is 15min, the collector is oleic acid (1000g / t), and the inhibitor is ammonium sulfate (1000g / t), the pH adjuster is sulfuric acid (500g / t), the dispersant is water glass (900g / t), and the carrier is limestone powder (450g / t).

[0056] The operating conditions of the secondary selective reverse flotation cell are: the pH value of the slurry is 10.0, the temperature of the slurry is 40°C, the residence time of the flotation cell is 30min, the...

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Abstract

The invention discloses a method for purifying sintering flue gas desulfurized gypsum and is characterized in that the following steps are included: (1) the reverse flotation technology: one or the combination of no less than two of rough flotation, selectiveness flotation and deep flotation; (2) steady flow, the steady flow is carried out on the serious fluid after reverse flotation by adopting a steady flow device; (3) centrifugal dehydration, solid-liquid separation is carried out on the serious fluid after steady flow by adopting a centrifugal dehydration device. The method can overcome the shortcomings that the dehydration performance of the serious fluid of desulfurized gypsum is not good, the color of the by-product gypsum is deep and the content of impurities is high in the prior art, and the desulfurized gypsum with high quality and high whiteness is obtained, meanwhile, the scum containing iron obtained in the by-product can be returned to the sintering process for re-utilization. Moreover, the device of the process is compact and occupies small area, investment is small, and operation is steady.

Description

technical field [0001] The invention relates to a purification technology of gypsum, in particular to a process for purifying sintered flue gas desulfurization gypsum. Background technique [0002] In the wet desulfurization process of flue gas in power plants, the purification and dehydration of gypsum slurry is generally completed in the gypsum dehydration system of the desulfurization island. The conventional dehydration system is mainly composed of gypsum cyclone station, waste water cyclone station, vacuum dehydration filter, gypsum slurry tank, gypsum slurry discharge pump and its return pipe regulating valve, water ring vacuum pump, air-water separator, waste water reuse tank, The filter cloth flushing water tank and flushing water pump, the filter cake flushing water tank and flushing water pump, as well as the corresponding pipelines, valves, auxiliary equipment and control system are composed. The entire dehydration process has a lot of equipment, occupies a large...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B03D1/00
Inventor 沈晓林石洪志石磊林瑜刘道清王如意陈荣欢顾德仁
Owner BAOSHAN IRON & STEEL CO LTD
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