Device and process for washing phosphoric acid tail gas and cogenerating sodium fluosilicate

A technology of sodium fluorosilicate and exhaust gas, which is applied in the direction of phosphoric acid, silicate, phosphorus oxyacid, etc., can solve the problems of normal operation of environmental protection facilities, strong corrosion, difficult storage, etc., to save resources and reduce exhaust gas , Improve the effect of running quality

Inactive Publication Date: 2011-02-16
山东聊城鲁西化工第四化肥有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

During the uninterrupted operation of environmental protection facilities, a large amount of by-products of fluorosilicic acid are produced, which are extremely corrosive and difficult to store, which brings confusion to the normal production of our chemical enterprises and the normal operation of environmental protection facilities

Method used

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  • Device and process for washing phosphoric acid tail gas and cogenerating sodium fluosilicate
  • Device and process for washing phosphoric acid tail gas and cogenerating sodium fluosilicate
  • Device and process for washing phosphoric acid tail gas and cogenerating sodium fluosilicate

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Embodiment 1

[0022] Example 1 A process for washing phosphoric acid tail gas and co-producing sodium fluorosilicate, the flow chart is as follows figure 2 As shown, the direction of the arrow in the figure indicates the running direction of the material. The specific steps are:

[0023] (1) After the phosphoric acid tail gas is extracted from the third area of ​​the reaction tank, it is washed through the Wen style tube 1, the washing liquid tank 2, the first suction tower 3, and the second suction tower 4, then the fluosilicic acid is dissolved in water, and the washing liquid is recycled; other After the tail gas not dissolved in water enters the tail gas scrubber 5, the defoamer 6, the tail gas blower 7 and the tail gas chimney 8, it is emptied;

[0024] (2) Supplementation of washing liquid: make up water from the second washing tower 4, then divert to the first washing tower 3, then divert from the first washing tower 3 to the washing liquid tank 9, and inject it into the venturi tu...

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Abstract

The invention discloses a device for washing phosphoric acid tail gas and cogenerating sodium fluosilicate. The device comprises a venturi tube, a washer liquid tank, a washing tower I, a washing tower II, a tail gas washer, a defoamer, a tail gas fan, a tail gas chimney, a washer liquid geosyncline, a venturi tube washing pump, a filter press feed pump, a frame filter press, a fluosilicic acid pool, a fluosilicic acid pump and a sodium fluosilicate reaction tank. The invention also discloses a process for washing phosphoric acid tail gas and cogenerating sodium fluosilicate. The process comprises the following steps: washing the phosphoric acid tail gas with water, wherein the fluosilicic acid is dissolved in water; adding sodium sulfate into the water with the dissolved fluosilicic acid for reaction to generate sodium fluosilicate and sulfuric acid; and filtering to obtain sodium fluosilicate. The invention solves the problem of using the byproduct fluosilicic acid in the production process, improves the operation quality of the environmental protection equipment in plants, guarantees the environment quality and creates new economic growth points.

Description

technical field [0001] The invention relates to a device and process for washing phosphoric acid tail gas and co-producing sodium fluorosilicate. Background technique [0002] At present, most chemical companies continue to increase environmental protection equipment on the basis of the original environmental protection equipment to ensure that various exhaust gases can meet the standards and protect the earth's environment. However, the intermediate by-products produced in this way are constantly increasing, and fluosilicic acid is one of them. During the uninterrupted operation of environmental protection facilities, a large amount of fluosilicic acid by-products are produced, which are extremely corrosive and difficult to store, which brings confusion to the normal production of our chemical companies and the normal operation of environmental protection facilities. Contents of the invention [0003] In view of the above prior art, in order to protect the environment, r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/18B01D53/14C01B33/32B01D53/18
Inventor 王延吉孙海兵张长卿
Owner 山东聊城鲁西化工第四化肥有限公司
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