HCl indium zinc and iron slag to mention the effective use of resources and theoretical studies of the process

Title: HCl indium zinc and iron slag to mention the effective use of resources and theoretical studies of the processAuthor: YongmingDegree-granting units: Central South UniversityKey words: hydrometallurgy;; mention indium;; iron oxide yellow;; zinc ferrite;; iron vitriol slagAbstract:For the effective use of iron sulfide concentrate resources and avoid iron slag dumps pollution on the ecological environment, and simplify the existing iron vitriol slag mention
Indium processes and improve the yield of Neodymium Magnets indium straight and eliminate low concentrations of gas emissions harm SO_2, this paper presents a hydrochloric acid system, put the wet zinc waste
Indium and iron resources, effective use of new technology. First of HCl extraction of indium zinc, iron, yellow iron alum preparation and decomposition of such processes into the alkali residue
Line system and in-depth theoretical analysis, to elaborate on the thermodynamics and kinetics. Double balance method discussed in detail Zn (Ⅱ
)-Fe (Ⅲ)-NH_3-CO_3 ~ (2 -)-C1-H_2O system zinc ferrite precursor co-precipitation process, [Zn] T, [Fe] T, [NH_3] T,
[CO_3 ~ (2 -)] T, pH balance between, to determine the Zn ~ (2 +), Fe ~ (3 +) ions were the best pH range of precipitation
6.3 <pH <7.3.In the theoretical analysis, based on the residue of zinc hot acid leaching, the leaching solution to restore and clean, TBP extraction of indium and zinc
Process of technology research. The results show that the temperature 90 ℃, time of 2h ~ 4h, M_ (HC1) / M_ (Theory) = 1.5 ~ 2.5, liquid-solid
Than L/S- (3 ~ 5): 1 conditions, the zinc slag Zn, Fe, In the leaching rate of more than 95%. To hot acid leaching solution by adding magnetic pyrite
Zinc sulfide ore or concentrate to restore leaching. With pyrrhotite as the reducing agent, in W_ (pyrrhotite) / W_ (Theory) = 1.4, temperature
90 ℃, time 2h, pyrrhotite particle size http://www.everbeenmagnet.com/en/products/110-sintered-neodymium-magnets of 0.088mm ~ 0.106mm optimal conditions, Fe ~ (3 +) reduction rate
96.30%, As ~ (3 +), Sb ~ (3 +) removal rates were 67.7% and 24.77%; the use of zinc sulfide concentrate as reductant at a temperature of 90 ℃,
Time 3h, zinc sulfide concentrate particle size 45μm, W_ (ZnS) / W_ (Theory) = 1.1, under the best conditions, Fe ~ (3 +) the average reduction rate
96.62%, Zn, Fe, In the average leaching rates were 93.89%, 94.46% and 97.89%. Temperature 50 ℃, time 25min, with iron
Volume of 1.6 times the theoretical amount of added iron replacement under optimal conditions, impurity, Cu ~ (2 +), Pb ~ (2 +), Cd ~ (2 +) removal rates were
99.90%, 32% and 17%, In the loss rate <1%. Purification of water from liquid phase acidity 1.5mol · L ~ (-1), the organic phase composed of 70%
TBP +30% sulfonated kerosene, compared to the O / A = 1.5:1, temperature, vibration and standing time were 10min, 3 stage counter-current extraction under the best conditions
While extraction of indium zinc, In, Zn, Sn extraction rate> 99%, Fe ~ (2 +) extraction rate of <1%, thus achieving Fe and Zn, In the effective separation.
In compared to the O: A = 3:1,3 stage counter-current stripping, temperature, vibration and standing time are the best conditions for 5min, the organic load water-extraction
Phase, In, Zn stripping rates were 99% and 60% -90%, while the stripping rate of Sn <3%. Replacement of zinc plates at room temperature in stripping solution In ~ (3 +) can be produced
A sponge indium and pure ZnCl_2 solution, indium replacement rate> 99%.With purified FeCl_2 Raffinate as raw material, adding 2mol · L ~ (-1)
NH_4HCO_3 Preparation of the solution and precipitate Fe (OH) _2 + FeC03 suspension, and then pass into the air oxidation of iron Yellow output. The oxidation process
Follow the "dissolution of ionization. Oxide precipitation" reaction mechanism, nucleation and crystal growth is divided into two stages, the oxidation reactions are interfacial
Control, and its activation energy were 127.26kJ · mol ~ (-1) and 237.86kJ · mol ~ (-1). Oxidation temperature, air flow and system early
Starting pH value of the oxidation rate has a significant influence. Products are derived from iron oxide crystal-shaped or spindle-shaped needle structured α-FeOOH grains together
Integrated sphere.FeCl_2 Raffinate by H_2O_2 oxidation, the composition of the organic phase 80% TBP +20% sulfonated kerosene, aqueous phase acidity
3.5mol · L ~ (-1), compared to the O / A = 3:1, phase contact time 5min, room temperature process conditions, single-stage extraction of iron, the average extraction rate of iron
99.69%; then by comparison O / A = 1.5:1, phase contact time 3min, three counter-current stripping, under conditions of room temperature water stripping, the average iron
Stripping rate of 97.3%. Pure solution and from pure FeCl_3 ZnCl_2 by n_ (Zn): n_ (Fe) = 1:2 mix, the total metal ion concentration
0.3mol · L ~ (-1), adding 0.5mol · L ~ (-1) of NH_4HCO_3 solution as precipitating agent, chemical co-precipitation method at a temperature of 50 ℃
, M (NH_4HCO_3): M_ (Theory) = 1.2:1, stirring speed 600r · min ~ (-1) ~ 850r · min ~ (-1), additives of 16
Alkyl bromide under the conditions of preparation of zinc ferrite process precursor. Zn ~ (2 +), Fe_ (3 +) ion ratio of the basic theory of uniform by Shen
Lake, both liquid precipitation rates were on average Zn99.83% and Fe 99.92%. From a single precursor, dispersed spherical particles, flat
Both particle size of 100nm ~ 120nm, zinc-iron molar ratio of n_ (Zn): n_ (Fe) = 0.999:2. According to thermogravimetric - differential thermal analysis at 500 ℃
~ 700 ℃ calcination temperature of precursor, to get crystal regularity, morphology of a single, narrow size distribution of zinc ferrite powder. However, on calcination temperature
L exacerbated powder reunion, the best calcination temperature of 500 ℃, from zinc ferrite powder average particle size of 150nm or so. Proposed a "NaOH
Decomposition - hydrochloric acid-TBP extraction of indium reduction of zinc leaching "iron vitriol residue containing indium wet processing in the NaOH system in the decomposition of iron alum residue, output
Na_2SO_4 solution and containing In, Zn iron slag. The former impurity purified, concentrated and returned to Glauber's salt crystals recovered decomposition process; the latter into
HCl leaching and selective extraction of TBP In, Zn, after leaching residue as iron enriched by magnetic materials. Of iron alum residue decomposition and decomposition of alkali
Slag HCl leaching process carried out, the results show that W_ (NaoH): W_ (iron alum residue) = 0.3814:1, temperature 60 ℃, liquid-solid ratio 2:1,
Under optimal conditions, the time 2h, iron alum residue decomposition rate of 98.03%, As the leaching rate of 83.36%, In, Cu, Pb, Cd, Ag, Zn,
Sb, Sn and other impurities must stay in the most decomposed residue. DSC-TGA thermal analysis and XRD diffraction analysis showed that the decomposition of iron vitriol slag alkali process, iron
Mainly Fe_3O_4 form into slag. Residue decomposition in Fe, In, Zn contents were 38.81%, 0.23% and 12.89%, the use of HCl in the temperature
Degrees 40 ℃, liquid-solid ratio 7:1, reaction time 2h, M_ (Hcl) / M_ (Theory) = 1.8 under the optimal conditions for leaching, In, Zn, Cu, Cd,
As, Sn, Sb, Pb, Ag total slag leaching rates were 98.26%, 99.35%, 98.79%, 98.93%, 76.27%, 68.50%,
80.12%, 64.82% and 60.80%. Decomposition of Fe 89.25% residue left in the leaching residue leaching residue as high as 52.48% Fe content, the magnetic-rich
Sets and impurity can be used as iron raw material.Hydrochloric acid extraction system, wet waste indium zinc, yellow zinc and iron preparation, iron, zinc new work
Arts achieve low concentration of iron slag and flue gas of zero-emission SO_2, In and Zn directly substantial increase in yield. Raw material can be iron yellow iron, iron acid
Zinc, iron red, iron ore and other forms used effectively to eliminate the iron slag pollution emissions on the environment. This process can be effective at
Reason to mention the traditional hydrometallurgy process output with indium indium, zinc and iron alum residue leaching residue, China's reserves of indium-rich sphalerite resources, high-speed rail
Development and utilization is also important.Degree Year: 2009