Tungsten ore beneficiation wastewater utilization
A large amount of water glass and collector are added during the tungsten ore dressing process, and the fines content of the ore dressing wastewater is large and the sedimentation is slow. The direct reuse of the ore dressing wastewater will seriously affect the ore dressing index. In particular, the direct reuse of tailings water to grinding and sulfide ore flotation will have a greater impact on the recovery of sulfide ore and subsequent recovery of tungsten. In the production, the water quality is reused, that is, the return water returns to the corresponding operation, that is, the sulphide ore tail water returns to the grinding and sulfide ore flotation, and the oxidized ore flotation tailing water returns to the oxidized ore flotation system; Or the total tailings water can only be returned to the oxidized ore flotation system, and the 100% utilization of the return water of the concentrator is realized in the Xiaoliugou plant in Gansu.
A large amount of research has been conducted in recent years on flocculants and sedimentation techniques for tungsten-selected wastewater.
A scheelite ore dressing water contains a large amount of solid suspended matter, the water sample is turbid, the COD and Cr values ​​are high, containing a large amount of organic matter and reducing inorganic substances, and contains a small amount of heavy metal ions such as Al, As, Cu, Fe, and Mn. Sun Wei et al. [106] used magnetized flocculation technology to significantly shorten the time required for flocculation and sedimentation, and the obtained turbidity of the supernatant was lower, which could achieve complete reuse of the ore dressing wastewater. The purified water reuse had little effect on the beneficiation index. Guo Zhaohui et al [107] studied the sedimentation effect of different flocculants and coagulants on ore dressing wastewater, and used magnetic flocculation technology to study the wastewater reuse of a certain scheelite from Jiangxi Province as experimental materials. The results showed that purification The complete reuse of scheelite wastewater can be achieved.
In a tungsten- rhenium polymetallic ore dressing wastewater, the concentration of suspended solids and chemical oxygen demand (COD) are high, and the concentration of heavy metals is low, but there are many types, and it is difficult to achieve stable discharge. Guochao Hui et al [108] The aluminum-containing inorganic polymer coagulant and an organic coagulant dressing wastewater treatment the two-step coagulating sedimentation molybdenum, tungsten, bismuth, dynamic field 24h sampling results show that coagulation sedimentation process can be efficiently Tungsten Metal ore beneficiation wastewater. Furthermore, by optimizing the polysilicate than aluminum sulfate Sendust iron, suitably formulated polysilicate Ferric sulphate water treatment. Polysilicate sulfuric acid prepared at a suitable ratio of w(SiO2)=2.0%, n(Fe+Al)/n(Si)=2:1, n(Fe)/n(Al)=1:1 The aluminum-iron flocculant can reduce the turbidity of the tungsten-rhenium ore dressing wastewater by more than 95% at 1.5% dosage, the turbidity of the treated wastewater is 70 NTU, the COD removal rate is 70%, and the COD content in the treated wastewater. It is 72 mg/L; the removal rates of As, Be and Pb are more than 90%. The concentrations of As, Be and Pb in the treated wastewater are 34, 0.2 and 13 μg/L, respectively. The treated wastewater reaches GB8978-1996 ("Sewage Integrated emission standards") Level 1 standard.
The content of suspended solids in a tungsten ore dressing wastewater in Jiangxi is relatively high. The main pollution factors are SS, COD, Cr, pH, lead and zinc . Chen Ming et al [109] used lime destabilization-flocculant sedimentation method to treat the waste water of tungsten mine tailings reservoir, adjusted the pH value to 11.5 with lime milk and allowed to stand for 10 min, then added polyacrylamide, and the pH of the treated wastewater supernatant was treated. The value was 8.5, SS decreased to 128 mg/L, COD and Cr content were lower than 50 mg/L, and the mass concentrations of Pb, Cd and As decreased to 0.03, 0.005 and 0.064 mg/L.
Luan Molybdenum Tungsten higher Beneficiation tailings suspended solids content, and the component type is more complex, containing a variety of pharmaceutical processing, such as No. 2 oil, water glass, coal oil, soda ash, sodium silicate and a number of saponification. Li Zhancheng et al [110] found that the combination of calcium carbide slag and organic polymer flocculant, the tailing water water sedimentation speed is fast, the return water is clear, the quality is good, the tailing water treatment cost is low, and only one agent can save cost. 300,000 yuan / year. This is because when the industrial waste containing calcium is added to the tailings water, the positively charged Ca2+ is supplied, and the electric double layer with negatively charged colloid is compressed, which lowers the zeta potential and destroys the stability of the negatively charged colloid. Sexuality causes the particles in the tailings water to agglomerate. However, after the industrial waste residue containing calcium is added, the floc particles formed are small in particle size, the sedimentation speed is slow, and the sedimentation time is long, and the organic polymer flocculant binds the destabilizing particles through the bridging action of the polymer. The formation of larger particles improves the sedimentation performance of the flocs and enhances the removal effect.
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