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Concentration and cold-precipitation separation method of sodium sulfate and ammonium sulfate from vanadium-precipitation mother liquor high-salt wastewater

A high-salt wastewater and separation method technology, applied in the direction of alkali metal sulfite/sulfate purification, ammonium sulfate, chemical instruments and methods, etc., can solve the problem that the return to production and utilization cannot meet the reuse requirements, and the wastewater cannot meet the requirements to waste water

Inactive Publication Date: 2012-11-21
史永军 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This type of wastewater is far from meeting the national standard for wastewater discharge, and even if it is returned to production and utilization, it will not meet the requirements for reuse. Therefore, it must be properly treated before it can be discharged or utilized.

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  • Concentration and cold-precipitation separation method of sodium sulfate and ammonium sulfate from vanadium-precipitation mother liquor high-salt wastewater
  • Concentration and cold-precipitation separation method of sodium sulfate and ammonium sulfate from vanadium-precipitation mother liquor high-salt wastewater

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Embodiment 1

[0011] The process flow of the invention is attached figure 1 The basic process of the present invention is as follows:

[0012] After removing vanadium, chromium and filtering, the mother liquor of waste water enters the concentration evaporation system, and evaporates at 75℃ until ammonium sulfate is unsaturated and part of sodium sulfate is saturated. The saturated sodium sulfate slurry is discharged from the concentration system and enters the centrifuge for centrifugal separation. Partially pure anhydrous sodium sulfate crystals; the remaining liquid enters the next effect. Continue to evaporate at 65°C until the ammonium sulfate is close to saturation. Sodium sulfate crystallizes out again, and the anhydrous sodium sulfate is separated by centrifugation; after sodium sulfate is separated, the remaining concentrated slurry is The co-saturated solution of sodium sulfate and ammonium sulfate enters the intermediate buffer pool, where it is cooled and further frozen to 0℃~5℃, an...

Embodiment 2

[0014] The process flow of the invention is attached figure 2 The basic process of the present invention is as follows:

[0015] 1. After vanadium and chromium removal, the vanadium precipitation wastewater with heavy metal content up to the standard is filtered, and the clarified supernatant enters the evaporation concentration system for concentration and evaporation;

[0016] 2. The evaporative concentration system is a multi-effect evaporation. According to the phase diagram data of sodium sulfate and ammonium sulfate (sodium chloride can be temporarily ignored due to its low content, but should be considered appropriately when the system is selected), the wastewater is first Evaporate at ℃ until the ammonium sulfate is unsaturated and part of the sodium sulfate is saturated, so that part of the sodium sulfate crystallizes out, centrifuged to obtain pure anhydrous sodium sulfate crystals; the remaining liquid enters the next effect, and the system materials continue to evapora...

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Abstract

The invention relates to a concentration and cold-precipitation separation method of sodium sulfate and ammonium sulfate from vanadium-precipitation mother liquor high-salt wastewater, and the concentration and cold-precipitation separation method comprises: removing vanadium and chromium from wastewater mother liquor, then carrying out evaporation concentration on the mother liquor at the temperature of 75 DEG C and 65 DEG C to crystallize and precipitate anhydrous sodium sulfate, centrifugally separating anhydrous sodium sulfate, cooling the separated concentrated slurry to 0-5 DEG C to precipitate ammonium sulfate and sodium sulfate complex salt and obtain the remaining liquid (ammonium sulfate solution), and entering the remaining liquid into a storage tank for directly reusing; and drying the complex salt, mixing with separated anhydrous sodium sulfate and packaging for use. The concentration and cold-precipitation separation method provided by the invention has the main characteristics that: a cooling crystallization system is directly introduced to a wastewater evaporation concentration system and the two systems are interacted, so that the high-salt wastewater is directly subjected to solid-liquid separation and solid-waste separation in an integrated system, wastewater and ammonium sulfate are completely recycled, and sodium sulfate does not contain crystal water, hashigh purity, is in a powder shape and can be directly used, and thereby achieving environmental protection requirements and cycle economic goals of zero wastewater discharge and solid-waste complete utilization.

Description

Technical field [0001] The invention belongs to the production field of waste water treatment in the extraction of heavy metals in vanadium chemical industry, other chemical industry and metallurgical industry, and specifically relates to a method for concentration and crystallization separation of sodium sulfate and ammonium sulfate in high-salt wastewater of vanadium precipitation mother liquor. Background technique [0002] In the production process of vanadium oxide, vanadium chemical enterprises burn vanadium slag or ferrovanadium concentrate with sodium salt (sodium carbonate or sodium chloride) and react together to produce water-soluble sodium vanadate and many other Insoluble matter, then add water to dissolve the sodium vanadate in the clinker to form an aqueous solution of sodium vanadate, then add sulfuric acid to adjust the pH to 2-2.5, and add excess ammonium sulfate to react with sodium vanadate to generate polyvanadic acid Ammonium precipitates, and a large amount...

Claims

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Application Information

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IPC IPC(8): C01C1/24C01D5/16C02F9/10
Inventor 史永军王文领吴玄斌
Owner 史永军
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