Tungsten Smelting Wastewater Recycling by Ion Exchange Method

In the process of the production of ammonium para tungstate by ion exchange, a large amount of waste water will be produced. The wastewater mainly contains tungsten, alkali, chloride ion, ammonia nitrogen, COD, a small amount of arsenic, fluoride ions and other elements. Because of the complexity of the components in the waste water, finding a system and method for comprehensive treatment of tungsten smelting wastewater will help enterprises to save energy and reduce emissions.

In order to achieve the combined treatment of different wastewater after subsection treatment, some scholars have proposed a comprehensive treatment recovery system for waste water treatment by tungsten smelting ion exchange method. The characteristics of the system are mainly composed of crystallized mother liquid collection tank, ammonia stripping pot, post transfer liquid collection tank, pH regulating pool, and post liquid plate frame filter press. After pressure filtration, the liquid storage tank, D318 macroporous resin recovery column, weight removal comprehensive treatment pool, heavy plate and frame filter press, mixed collection pool, ammonia nitrogen treatment pool, pH fine tuning pool, clarifier, and sodium washing water washing pool are also included, and the sodium washing and chlorine washing pool is connected with the mixed collection pool. The process includes:

(1) The wastewater from the crystalline mother liquor is first added to the alkali, adjusting the pH to the specified value, pumping into the evaporating reaction deamination pot and evaporating the ammonia. When the ammonia nitrogen in the wastewater is lower than 300mg/l, the liquid collection tank is mixed with the after mixing solution.

(2) The mixed solution of the post cross liquid and the crystallization mother liquor after deamination is discharged into the pH regulating pool, and the aeration is uniform, adding sulfuric acid, adjusting the pH of the waste water to the specified value, the adjusted waste water, and removing the precipitation in the waste water by the liquid plate frame pressure filter after crossing, and the clear liquid is adsorbed in the waste water through the D318 macroporous resin return column.

(3) After the recycling of tungsten, the wastewater is directly discharged into the comprehensive treatment pool to remove the arsenic, ammonia nitrogen, COD, fluorine and so on. The process is that after the effluent is aerated first, the required material A is added by sampling analysis, and the required material B is added to the required material after the aeration is uniform and then the required material is added. After half an hour, the required material C is added, then the aeration is evenly reacted for half an hour, and then the required material is added, then the required material D is added. After the analysis reaches the required requirement, the filter is filtered to remove the precipitate residue from the waste water, and the filtrate after the filtration is discharged into the mixed collection pool of the wastewater.

(4) The wastewater of high ammonia nitrogen washing in the early stage of chlorine washing is discharged into the mixed pool of wastewater, and the ammonia nitrogen and COD depth treatment is carried out. The cleaner sodium washing water and the later chlorine washing water are discharged directly into the wastewater collection and precipitation collection pool, and then the filter is filtered by the plate frame filter press.

(5) The wastewater in the mixed wastewater collection pool is discharged into the ammonia nitrogen treatment pool. As the treated wastewater mainly contains ammonia nitrogen and COD, the required material E is added through sampling analysis and analysis. The concentration of ammonia nitrogen is lower than 5mg/l under normal operation, and the concentration of COD is lower than that of 60mg/l. If it is beyond the standard, the required material is properly supplemented.

(6) The treated wastewater is discharged into the pH fine tuning pool. By adding a small amount of liquid alkali or sulfuric acid, the wastewater is adjusted to pH, and the wastewater after the micro adjustment of pH is discharged into the clarifier. After clarification, the effluent from the waste water is reduced and the outer row of the SS is reduced.

The process has the advantages of short process, simple design, less facilities and equipment, good recycling effect and low investment cost. It has good treatment effect on ammonia nitrogen, pH, COD, arsenic and fluorine. The removal rate of ammonia and arsenic is above 95%, the removal rate of COD is above 85%, and the fluorine concentration is also good when the concentration of fluoride is in a certain range. 

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