scholarly journals Sulfuration treatment of electroplating wastewater for selective recovery of copper, zinc and nickel resource

2013 ◽  
Vol 8 (2) ◽  
pp. 131-136
Keyword(s):  
Ph Value ◽  
Metal Sulfides ◽  
Mixed Solution ◽  
Resource Saving ◽  
Selective Precipitation ◽  
Selective Recovery ◽  
Mixed Metal ◽  
Copper Zinc ◽  
Recycle And Reuse ◽  
Electroplating Process

In the electroplating process, various metal salts are used and the residues on the surface of electroplated materials are rinsed out as wastewater, followed by hydration in a wastewater disposal step. Although a variety of metals are concentrated in the sludge, the mixed heterogeneous state of these metals in sludge makes it difficult to recycle and reuse them. From the viewpoint of environmental protection as well as resource saving, effective methods for recycling and reuse of these mixed metal sludge are required to be developed urgently. In the present work, selective recovery of the metals from mixed-metal wastewater by sulfuration treatment is proposed. Sulfuration treatment is characterized by low solubility of metal sulfides; metal sulfides are, in general, lower in solubility than that of metal hydroxides. For the experiments, three metals of copper, zinc and nickel which are commonly used in the electroplating process were chosen. Separation of these metals from the mixed solution in various pH ranges was conducted by employing three sulfurating agents: sodium sulfide (Na2S), sodium disulfide (Na2S2) and sodium tetrasulfide (Na2S4). Aqueous solutions of CuSO4, ZnSO4 and NiSO4 and those of real plating wastewater, of which the initial concentrations were adjusted to 100-300 mg dm-3 were employed. By sulfuration treatment of the simulated solution using each sulfurating agent without adjusting pH, CuS was first precipitated, but ZnS and NiS were also precipitated at the same time. In addition, pH value increased with the amount of sulfurating agents in the solution. The results demonstrated that the formation behavior of metal precipitates depended on pH value of the solution. For the sulfuration with three kinds of sulfurating agents, copper was first separated from the solution as CuS in pH=1.4-1.5, then ZnS was precipitated in pH=2.4-2.5, followed by the precipitation of nickel sulfide, NiS in the residual solution at pH=5.5-6.0. It was also found that Na2S is most effective for selective precipitation of metal sulfides, among the three sulfurating agents of Na2S, Na2S2 and Na2S4. The selectivity of CuS in the filtrated cake obtained by the sulfuration treatment in pH=1.4-1.5 was about 94 % and was sufficiently high, in terms of allowable metal content level for recycling. The sequent selectivity of ZnS and NiS in the cake after the sulfuration treatment in pH=2.4-2.5 were 75-77 % and about 20 %, respectively. The selectivity of NiS and ZnS in the cake after the sulfuration treatment in pH=5.5-6.0 was 64-66 % and 33-35 %, respectively.

scholarly journals INNOVATIVE PROCESSES OF DEEP AND ENVIRONMENTALLY SAFE PROCESSING OF TECHNOGENIC RAW MATERIALS IN THE CONDITIONS OF NEW ECONOMIC CHALLENGES

2021 ◽  
Vol 13 (2) ◽  
pp. 224-237
Author(s):  
Valentin CHANTURIA ◽  
◽  
Irina SHADRUNOVA ◽  
Olga GORLOVA ◽  
◽  
...  
Keyword(s):  
Raw Materials ◽  
Mining Industry ◽  
Mineral Resources ◽  
Secondary Products ◽  
Resource Saving ◽  
Mineral Raw Materials ◽  
The Face ◽  
Environmentally Safe ◽  
Copper Zinc ◽  
Technogenic Raw Materials

Innovative processes of deep and complex processing of technogenic raw materials in the context of sustainable development of the mining industry and the economic challenges facing the mining industry should ensure the transition to a circular economy and the maximum use of natural resources. The article reflects the priority scientific and technological research on the involvement of technogenic mineral resources in efficient processing. Presented, developed at ICEMR RAS, including jointly with universities, research and production organizations and enterprises, modern innovative processes of deep and environmentally friendly processing of refractory mineral raw materials of complex material composition (tailings of enrichment of non-ferrous and noble metal ores, poor off-balance ores, slags ferrous and nonferrous metallurgy, sludge of metallurgical production) and hydro-mineral technogenic resources (acidic mineralized bottom-dump waters of mining enterprises of the copper-zinc complex of the Urals, saponite-containing circulating waters of diamond processing factories). Among other things, new directions in the field of selective disintegration of finely dispersed mineral raw materials based on energy effects and deep processing of slags are outlined; increasing the selectivity of enrichment processes; combined processing of technogenic raw materials; resource-saving processing of technogenic and hydro-mineral resources, obtaining secondary products from processing waste. It is shown that in the face of new economic challenges, Russia has sufficient scientific and technological potential in the field of deep and environmentally safe processing of technogenic raw materials in the form of developed and, to varying degrees, tested innovative resource-saving technologies that correspond to the world level, and in a number of technologies are superior to it.

scholarly journals Recent Advances on Mixed Metal Sulfides for Advanced Sodium‐Ion Batteries

2020 ◽  
Vol 32 (42) ◽  
pp. 2002976 ◽  
Author(s):  
Yongjin Fang ◽  
Deyan Luan ◽  
Xiong Wen (David) Lou
Keyword(s):  
Sodium Ion ◽  
Metal Sulfides ◽  
Sodium Ion Batteries ◽  
Mixed Metal ◽  
Recent Advances

Effect of Activating Device on the Properties of Tap Water

2010 ◽  
Vol 178 ◽  
pp. 86-91 ◽  
Author(s):  
Dong Mei Zhang ◽  
Jin Sheng Liang ◽  
Yan Ding ◽  
Can Li
Keyword(s):  
Surface Tension ◽  
Water Clusters ◽  
Ph Value ◽  
Tap Water ◽  
Far Infrared ◽  
Zinc Alloy ◽  
17O Nmr ◽  
Flow Rates ◽  
Copper Zinc ◽  
Functional Ceramic

Effect of activating device on the property of tap water was studied by surface tensiometer and pH meter. The results showed that the surface tension of tap water activated by the device reduced and pH value increased. The variations of surface tension and pH value are connected with flow rates. The larger flow rate, the less variation of surface tension and pH value when at the same cycle time, however, the more variation of surface tension and pH value when at the same activating time. Activated by the device, 17O NMR half width of tap water reduced from 70.79Hz at the inlet to 60.87Hz at the outlet. Reduction of surface tension were caused by hydrogen bonds in water clusters which were weakened or broken by far-infrared radiation of functional ceramic ball and galvanic cell action of copper-zinc alloy. Increment of pH value were caused by H+ in water exchanging with metal cations on surface of far-infrared ceramic balls and dissolved oxygen getting electron and forming OH-1 with the function of copper-zinc alloy.

Photocatalytic Degradation of 2-chlorophenol over TiO2 Powder

2014 ◽  
Vol 931-932 ◽  
pp. 291-295
Author(s):  
Pusit Pookmanee ◽  
Songpon Ngamta ◽  
Wiyong Kangwansupamonkon ◽  
Ratchadaporn Puntharod ◽  
Supaporn Sangsrichan ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Phase Transition ◽  
Photocatalytic Degradation ◽  
Ph Value ◽  
Ammonium Hydroxide ◽  
Titanium Isopropoxide ◽  
Chemical Compositions ◽  
Mixed Solution ◽  
Hydrothermal Route ◽  
Scanning Electron

Titanium dioxide (TiO2) powder was prepared by hydrothermal route. Titanium isopropoxide, ammonium hydroxide and nitric acid were used as the starting materials. The final pH value of mixed solution was 1 and treated at 80 and 100 °C for 26h. The phase transition of TiO2powder was studied by Xray diffraction (XRD). Multiphase of anatase and rutile of TiO2powder were obtained at 80 and 100 °C for 26h without calcination steps. The morphology of TiO2powder was investigated by scanning electron microscopy (SEM). The particle was highly agglomerated and irregular in shape with the range of particle size of 0.10.3 μm. The chemical composition of TiO2powder was examined by energy dispersive spectroscopy (EDS). The element chemical compositions show the characteristic Xray energy level as follows: titanium Kα= 4.51 keV and Kβ= 4.93 keV and oxygen Kα= 0.52 keV, respectively. The photocatalytic degradation efficiency of 2chlorophenol (2CP) over TiO2powder was determined by gas chromatography (GC). It was found that TiO2powder prepared by hydrothermal route at 80 °C for 2h was the best efficiency for photocatalytic degradation of 2CP.

scholarly journals Heavy metals content in Serbian old plum brandies

2013 ◽  
Vol 78 (7) ◽  
pp. 933-945 ◽  
Author(s):  
Mirjana Bonic ◽  
Vele Tesevic ◽  
Ninoslav Nikicevic ◽  
Jelena Cvejic ◽  
Slobodan Milosavljevic ◽  
...  
Keyword(s):  
Heavy Metals ◽  
Ph Value ◽  
Hydride Generation ◽  
Absorption Spectrometry ◽  
Atomic Spectrometry ◽  
Alcoholic Beverages ◽  
Cu Content ◽  
Lead And Cadmium ◽  
Flame Atomic Absorption ◽  
Copper Zinc

Seven elements, namely, arsenic, lead, cadmium, copper, zinc, iron and manganese were determined in 31 samples of Serbian plum brandies by applying atomic spectrometry techniques. Flame atomic absorption spectrometry was used for quantification of copper, iron, zinc, manganese, lead and cadmium; and hydride generation atomic spectrometry absorption for arsenic quantification. Measured concentrations of heavy metals and arsenic was assessed according to the Serbian regulations, official regulations of some other countries and in respect of microelements content in other similar distilled alcoholic beverages. Amounts of microelements in maximal recommended daily and weekly intake of plum brandy were determined. The influence of production (home made and industrial), type of wooden barrel (oak and mulberry), and duration of ageing process on the content of Zn, Cu, Fe and Mn in plum brandies, as well as coefficient of correlation between Cu content and pH value were also studied.

scholarly journals New Water Treatment Chemical PFZSS Preparation and Application

2015 ◽  
Vol 9 (1) ◽  
pp. 121-124
Author(s):  
Qilin Liu
Keyword(s):  
Water Pollution ◽  
Acid Solution ◽  
Water Purification ◽  
Ph Value ◽  
Absorption Capacity ◽  
Iron Sulfate ◽  
Mixed Solution ◽  
Solution Ph ◽  
Purification Method ◽  
Catering Industry

Nowadays global water quality pollution has become extremely serious, and solving water pollution has been extremely urgent, so researches on water pollution solutions have become even urgent. And flocculating method is the most traditional water purification method, research and create new high performance flocculating agent is one of flocculating method inherent problems. The paper mainly describes adding iron, zinc two kinds of metal captions together in polysyllabic acid, well controlling all aspects requirements in technology, researching and creating new water purification substance—poly iron and zinc silicate sulfate flocculants (PFZSS). PFZSS making method is weighting proper amount sodium silicate into container, and meanwhile putting it into water to dissolve, then utilizing dilute euphoric acid and sodium hydroxide to adjust silicic acid solution pH value and arrive at regulated scope, letting it to activate and arrive at certain time, slowly importing activated proper silica acid solution into moderate iron sulfate and zinc sulfate on the condition of fully blending, and finally putting and curing for a while. And implement experiment research on how mixed solution metal cations matching; making method, pH value, and silicon dioxide concentration these factors affect PFZSS overall performance. PFZSS application mainly takes catering industry sewage solution as an example to get PFZSS has very strong absorption capacity, owns good cleaning effects on extremely turbid catering industry treatment sewage COD and turbidity acquiring, its reaction formed flock density is great, sedimentation rate is very fast, so PFZSS will have great application prospects in the aspect of treating urban sewage.

The Thermodynamic Analysis of Ni1/2Mn1/2(OH)2 Prepared by Hydroxide Co-Precipitation Method

2013 ◽  
Vol 643 ◽  
pp. 104-107
Author(s):  
Yi Jie Gu ◽  
Qing Gang Zhang ◽  
Yun Bo Chen ◽  
Hong Quan Liu ◽  
Yan Min Wang ◽  
...  
Keyword(s):  
Thermodynamic Analysis ◽  
Ph Value ◽  
Chelating Agent ◽  
Ammonia Concentration ◽  
Precipitation Method ◽  
Mixed Solution ◽  
Sem Images ◽  
Precipitation System ◽  
Co Precipitation

The thermodynamic analysis of Ni2+-Mn2+-NH3-OH--H2O in co-precipitation system was carried out, and the precursor Ni1/2Mn1/2(OH)2 was prepared by hydroxide co-precipitation method. The analysis showed that the best pH value of mixed solution is 11 and the ammonia concentration is 0.4 mol/L, when NaOH is precipitating agent and ammonia is chelating agent. When the pH value is 11, the SEM images confirm that the morphology of Ni1/2Mn1/2(OH)2 is the best.

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