Study On The Process Of Preparing Sodium Antimonate By Wet Separation Of Antimony From Antimony Sulfide Ore

As an important strategic resource metal,antimony is mainly used in the printing industry,battery,flame retardant,military and other fields.At present,the smelting is mainly volatile roasting-reduction smelting or volatile smelting-reduction smelting method.Aiming at the shortcomings in the smelting process of sulphide sulphide ore,such as SO₂ flue gas pollution environment,limited comprehensive recovery of valuable metal elements in raw materials,and long process flow.And the disadvantages of the heavy metal?such as beryllium ore?in the pyrometallurgical process in which the crucible is dispersed in various processes and cannot be well enriched;The preparation of sodium citrate fire process has the disadvantages of high energy consumption,long process flow,poor product quality,and harmful gas emissions polluting the environment.In this paper,a new wet process of sodium citrate is prepared by"high temperature and high pressure sodium sulfide alkali leaching-high temperature and high pressure pure oxygen oxidation",which lays a foundation for the enrichment and reuse of different types of strontium sulfide ore.Firstly,the E-pH diagrams of Sb-S-H₂O system,Cu-S-H₂O system,and Fe-S-H₂O system were constructed using Factsage 7.2 software in this study,and the distribution directions of main components of bismuth,copper and iron after leaching in Na₂S-NaOH solution were discussed.The results show that strontium can be dissolved in the solution with increasing temperature and pH value;both copper and iron are present in the slag phase,which is beneficial to the selective leaching of antimony.Secondly,the effects of single factors conditions?leaching temperature,leaching time,Na₂S concentration,NaOH concentration,liquid-solid ratio?on the leaching rate of antimony were investigated.The normal temperature and pressure leaching experiments were carried on the stibnite?the content of antimony is 26.83%and the particle size of-30 mesh accounts for 83.45%?.Under the optimum conditions,the leaching rate of antimony is above 99%,and the leaching slag only contains quartz?SiO₂?.In the leaching experiment of tetrahedrite?the content of antimony is 2.96%and the particle size of-200 mesh accounts for 97.45%?,the highest leaching rate of antimony was 43.99%at normal temperature and pressure,and the leaching rate of strontium can reach 80.2%at high temperature and high pressure leaching.The slag rate of copper and iron is more than 99%.Combined with the results of phase analysis of leaching slag,copper forms a new phase of form,mainly in the form of copper blue?CuS?and chalcopyrite?Cu₂S?,which is more conducive to The leaching slag returns to the smelting of copper.Finally,sodium antimonate was prepared by high temperature and high pressure pure oxygen oxidation from the leaching liquid of stibnite and tetrahedrite.The effects of single factors conditions?oxidation temperature,oxidation time,NaOH concentration and oxygen pressure?on the antimony precipitation rate were investigated,oxygen pressure.The temperature and time have a significant effect on the sedimentation process,while the sodium hydroxide concentration in the liquid has a relatively small influence.The content of antimony in sodium thiosulfite solution was16.4g/L.Under the optimal conditions,the sedimentation rate of antimony was 99.74%,and the sputum contained in the solution was not more than 0.6g/L.The obtained sodium citrate product basically conforms to the electronic industrial grade hydrated sodium citrate quality standard?YS/T 22-2010??secondary product?.