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含金硫化矿无捕收剂浮渣浆泵选的机理是什么?

含金硫化矿无捕收剂浮渣浆泵选的机理是什么?

作者:admin    来源:未知    发布时间:2020-01-03 09:42    浏览量:
含金硫化矿无捕收剂浮渣浆泵选的机理是什么?
    常见的硫化矿物,诸如黄铜矿.方铅矿和黄铁矿等都具有良好的电子导电性,这些硫化矿由于其表面结构特征、表面电子状态以及电子传导能力等的不同,使得它们实现无捕收剂浮选的途径也不相同。
    硫化矿物的无捕收剂浮选可以大致地分为两类:一类是以方铅矿、黄铜矿为代表的硫化矿物在电化学调控下,自身的氧化就可以导致矿物表面的无捕收剂疏水化和浮选,它们可以借助于电化学调控技术,使其表面硫上的电子转移给电负性较大的分子氧,而被氧化成单质硫(S0) 或者富硫层(M1-zS),这二者疏水性好,可以使黄铜矿和方铅矿表面疏水化,所以它们表面硫的自身氧化生成的单质硫或者富硫层是其无捕收剂浮选的主要疏水体,故黄铜矿等具有良好的无捕收剂无硫化钠浮选行为。黄铜矿等硫化矿物在酸性和碱性条件下都可以在其表面生成单质硫,反应式如下:
富硫层是硫化矿物初期氧化。金属离子部分离开其表面而形成的一层金属少、硫多的非化学计量层,富硫层形成的可能能化学反应另一类是以与黄铁矿等表面电子状态不同的黄铁矿为典型代表,黄铁矿不具备自身氧化而生成单质硫或者富硫层的能力,不能无其他化学试剂疏水化和浮选,需要外加硫离子(S ),确切地说是外加硫化钠,通过硫化钠在矿物表面上的氧化,导致硫化矿物的无捕收剂疏水化和浮选。
    当硫化钠加入矿浆以后,会解离出HS和S,S和HS上的电子可以通过黄铁矿表面上的硫质点传递给分子氧,这样的电子转移将导致溶液中的S2-和HS-氧化为单质硫或者富硫层,并覆盖在黄铁矿表面,促使其疏水化而浮选。在该过程中,阳极的氧化反应和相应阴极的还原反应分别如下所示:
由于阳极失去电子和阴极得到电子是通过黄铁矿表面传导电子实现的,所以可以形象地表示如下:
国外对于黄铜矿、黄铁矿、方铅矿和闪锌矿的单一矿物中等碱性条件下无捕收剂无硫比钠的自感应性浮选试验研究表明,黄铜矿和方铅矿的较好可浮性以及黄铁矿和闪锌矿无捕收剂时的很差可浮性试验结果与述的分类结果一致。对于黄铁矿和石英的混合物,研究表明,在pH为8或9时,黄铁矿不具有无捕收剂浮选的条件。此时不论是铜盐.铅盐还是过量的乙胺四乙 酸盐,均不能促进黄铁矿的评选。所以乙二胺四乙酸盐这一络合剂不能从黄铁矿-石英的混合物中从黄铁矿表面上剥离金属离子或者金属氢氧化物,使其表面成为富含硫的疏水层。
    在硫化钠存在的条件下,在pH为8或者9时,硫化后的黄铁矿可以实现无捕收剂浮选,回收率可达90%以上。渣浆泵厂家
研究还发现,在黄铁矿与方铅矿和闪锌矿的混合物以及与黄铜矿和石英的混合物中,黄铁矿可以与黄铜矿和方铅矿在中等碱性条件下,一同实现无捕收剂上浮。但是,当黄铁矿与闪锌矿和石英一起时,则黄铁矿并不可浮。导致黄铁矿在中等碱性条件下浮游的疏水性本体是以硫为基础的物质,它来自另一种硫化矿 物( 例如黄铜矿或者方铅矿)。造成硫由其他硫化矿物向黄铁矿表面转移的中介物可能是某种可溶性硫化物,并且这个过程矿浆的pH和电位(Eh)紧密相关。
What is the mechanism of gold bearing sulphide ore flotation without collector?
Common sulfide minerals, such as chalcopyrite, galena and pyrite, have good electronic conductivity. Due to the difference of surface structure, surface electronic state and electronic conductivity, the ways to realize collector free flotation are also different.
The collector free flotation of sulfide minerals can be roughly divided into two categories: one is that under the electrochemical control, the oxidation of sulfide minerals, such as galena and chalcopyrite, can lead to the collector free hydrophobicization and flotation on the mineral surface. They can transfer the electrons on the surface sulfur to the molecular oxygen with higher electronegativity, and then be oxidized into a single The sulfur-free (S0) or sulfur-rich layer (M1 ZS), both of which have good hydrophobicity, can make the surface of chalcopyrite and galena hydrophobic, so the single sulfur or sulfur-rich layer formed by the self oxidation of sulfur on their surface is the main drainage water body for flotation without collector, so chalcopyrite and other minerals have good flotation behavior without collector and sodium sulfide. Under acid and alkaline conditions, chalcopyrite and other sulfide minerals can generate elemental sulfur on their surfaces. The reaction formula is as follows:
Sulfur rich layer is the initial oxidation of sulfide minerals. A non stoichiometric layer with less metal and more sulfur formed when the metal ion part leaves its surface. The possible chemical reaction formed by the sulfur rich layer is represented by pyrite with different surface electronic state from pyrite. Pyrite does not have the ability to oxidize itself to form elemental sulfur or sulfur rich layer, and it cannot be hydrophobicized and floatated without other chemical agents. It needs to Adding sulfur ion (s), specifically, adding sodium sulfide, through the oxidation of sodium sulfide on the mineral surface, leads to the hydrophobic and flotation of sulfide minerals without collectors.
When sodium sulfide is added into the pulp, HS and s will be dissociated, and the electrons on S and HS can be transferred to molecular oxygen through the sulfur particles on the pyrite surface. Such electron transfer will cause S2 - and HS - in the solution to be oxidized to elemental sulfur or sulfur rich layer, and cover the pyrite surface, promote its hydrophobicization and flotation. In this process, the oxidation reaction of the anode and the reduction reaction of the corresponding cathode are respectively as follows:
As the anode loses electrons and the cathode gains electrons through conducting electrons on the pyrite surface, it can be expressed as follows:
The results show that the better floatability of chalcopyrite and galena and the very poor floatability of pyrite and sphalerite without collectors are consistent with the classification results. For the mixture of pyrite and quartz, the study shows that pyrite does not have the condition of flotation without collector at pH 8 or 9. At this time, neither copper salt, lead salt nor excessive ethylamine tetraacetate can promote the selection of pyrite. Therefore, ethylenediaminetetraacetate, as a complexing agent, can not strip metal ions or metal hydroxides from the pyrite surface from the mixture of pyrite and quartz, so that its surface becomes a hydrophobic layer rich in sulfur.
In the presence of sodium sulfide, pyrite can be floatated without collector at pH 8 or 9, and the recovery can reach more than 90%. Slurry pump manufacturer
It is also found that in the mixture of pyrite with galena and sphalerite, and with chalcopyrite and quartz, pyrite and galena can float up without collector under medium alkaline condition. However, when pyrite is combined with sphalerite and quartz, pyrite is not buoyant. The hydrophobic substance that causes pyrite to float in medium alkaline condition is sulfur based substance, which comes from another sulfide mineral (such as chalcopyrite or galena). The mediator of sulfur transfer from other sulfide minerals to pyrite surface may be some soluble sulfide, and the pH and potential (EH) of pulp in this process are closely related.


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