When the indium associated with the tin concentrate is reduced and smelted, approximately 65 % of the indium is volatilized into the soot and 30 % is reduced to the crude tin. The crude crystallization in addition to tin in lead, indium, a small amount of the refined tin, in the majority of the solder, the solder containing indium and sometimes up to 0.02% to 0.03%. In the case of solder electrolytic refining, indium is dissolved in the electrolyte. When the electrolyte used repeatedly, the accumulation of indium, indium containing up to 0.3 ~
Figure  P 204 extraction process of indium
   Dilution and neutralization:
( 1 ) Dilute the head water with pure water to contain indium
( 2 ) Neutralization process control PH = 2.5~4.0 , which can reduce the tin content of the solution to
( 3 ) The filtered tin hydroxide residue can be used as a tin-removing raw material, and the filtrate (neutralizing liquid) is sent to extract indium.
Indium extraction:
( 1 ) Neutralization solution plus hydrochloric acid adjustment Ph = 1~1.5 , Cl - =
( 2 ) The ruthenium-containing organic phase is added with an oxidizing agent hydrogen peroxide (H 2 O 2 ), so that Sn 2+ is changed to Sn 2+ and remains in the organic phase, and indium is stripped with 6 mol 1 /L hydrochloric acid for three-stage back extraction. Stripping solution containing indium
( 3 ) The organic phase after indium extraction is washed with 8 mol/L hydrochloric acid to remove most of the tin, and P 204 is changed to H + type for return extraction. A small amount of iron in the organic phase may be added to the SnCl 2 solution to change Fe 3+ to Fe 2+ to facilitate washing; the amount of SnCl 2 added is Sn0. 1 ～ 0
Indium recovery:
(1) the acidity of the solution was adjusted to pH = stripping after 3 to 4, to obtain replacement with indium sponge aluminum plate.
(2) caustic soda used as a coating agent, the sponge is melted at a temperature of 38 0 ~ 40 0 ℃ indium indium to give a crude (containing 90% ~ 95% In).
(3) except for crude indium thallium chloride in a molten state at 260 to ~ 28 0 ℃. The herbicide added is Zn : ZnCl 2 : NH
(4) for electrolytic refining, a current density of 9 0 ~ 50A / m 2, electrolyte pH = 2 ~ 3, the liquid temperature is room temperature, 0. 2 ~ 0.5V cell voltage in addition to the crude indium thallium, with the pole pitch
( 5 ) The cathode indium obtained by electrolysis is vacuum distilled to produce "five-nine" high-purity indium. The conditions for vacuum distillation are: vacuum degree 13.33 2 ~ 1.333Pa , temperature 86 0 ~
Tin recycling:
( 1 ) "Tank water" and tin hydroxide filter residue produced by tin removal, melted with caustic soda and saltpeter to produce sodium stannate. Temperature 30 0 ~ 50 0 °C , tin to alkali ratio is 1 : 0.5 5 ~ 0.60 , tin to nitrate ratio is 1 : 0.2 1 ~ 0.25 .
( 2 ) Water-soaked crude sodium stannate solution. The liquid-solid ratio at leaching is 4 : 1 , and the density of leaching solution is 1.18 to 1
( 3 ) The leachate is delead with sodium sulfide. The amount of sodium sulfide (g) and the solution volume (ml) ratio of 1: 3, the temperature 8 0 ~ 8 5 ℃.
(4) sodium stannate solution was replaced deleading sheet with tin, antimony off, the temperature is 91 to
( 5 ) The solution after depurination is concentrated. The concentration of the mother liquor in one concentration is greater than 35Be ; the proportion of the mother liquor in the second concentration is greater than 40Be .
( 6 ) The concentrated liquid is cooled and crystallized, and after filtration, it is baked and ground to obtain a first-grade sodium stannate product.
( 7 ) Comprehensive recovery rate of oil head water: Sn is higher than 98 %, and In is higher than 80 %.
It is also reported that the distribution data (%) of indium in various refining scums in the refining of crude tin in a factory is as follows: iron scum 4.7 , sulfur slag 19.8 , aluminum slag 18.2 , lead scum 44.0 , Fine tin 0.7 , loss 12.6 . It is indicated that a large amount of indium is concentrated in the lead scum, and the content is 0.91 to 0.20 %. The plant after the lead and zinc dross processing, indium chloride into the slag, and then washed with water to separate leached zinc, indium residue containing up to 0.6% to 0.8%, and then make the most of the alkali leaching of lead, zinc, tin Into the solution, while indium is enriched in the leaching slag in the form of In (OH) 3 , and the indium is increased to 2.8 %. The slag is dissolved in hydrochloric acid, and the crude indium containing 80 % or more of indium is obtained by replacing with tin or zinc , or the indium is precipitated by sodium hydroxide and then smelted into crude indium, and the crude indium is refined into pure indium.
HSK shank Tool Holder ,balanced G6.3 or G2.5 For choose,With DIN6499 Collet Chuck can be straight shank cutter clamping various sizes. Hsk Tool Holders for mechanical spindle and cutting tool and other accessory tool connection. Is a simple, popular spindle shank connection standard, mainly NT30 NT40 NT50... Etc.. Mold industry, and high-speed engraving machine, used more.At present the main traditional CNC Machine tool accessories standard Hsk Tool Holder ,Hsk Er Spring Collet Chuck, HSK Oz Collet Chuck , HSK C Powerful Collet Chuck, HSK Combine Shell End Mill Arbor, HSK FMA Face Mill Holder ,HSK FMB Face Mill Holder, HSK SLA Side Lock End Mill Holder,HSK MTB Morse Taper Sleeve , HSK Drill Chuck Arbor , HSK Apu Drill Chuck , HSK MTA Morse Taper Sleeve with high quality, low price.
HSK Tool Holder
Hsk Tool Holder,Hsk Er Tool Holder,Miling Hsk Er Tool Holder,Hsk 63 Tool Holder
JINING QINFENG MACHINERY HARDWARE CO.,LTD , https://www.qftoolholder.com