Precipitate Flotation of Complexed Cyanide

Abstract

Precipitated cyanide, complexed with Fe(II) at a molar Fe/CN ratio of 0.550, can be floated readily from aqueous suspension with a cationic surfactant, ethylhexadecyldimethylammonium bromide. The effects of three distinct mixing times of significance in preparing the precipitate and contacting it with surfactant, of pH, of initial cyanide concentration, of initial surfactant concentration, and of ionic strength have been established experimentally. Mixing times and the initial cyanide concentration have little influence on the flotation, while increases in pH and ionic strength have a most pronounced influence, part of which can be overcome with increased surfactant concentrations. At pH 6.0, 95% of the complexed cyanide can be foam separated from distilled water suspensions 1.5 to 3.1 mM in total cyanide. About 0.04 mole surfactant/mole complexed cyanide is required; about 0.08 mole/mole is required to increase the flotation to 99% or to overcome ionic strength effects.     

Continuous Precipitate Flotation of CuS/ZnS

Abstract

The precipitate flotation of copper and zinc as sulfides in dilute aqueous solutions (50-250 ppm metal ion concentration) was investigated in the laboratory in continuous flow. The dispersed-air flotation technique was followed, leading to a selective recovery of copper sulfide of the order of 95% in a high acidic pH region (of 1.7) by a laurylamine ethanolic solution as collector and with the addition of cetyl-pyridinium chloride as frother. The precipitate flotation of zinc sulfide was then accomplished with the same method at pH 5.0 as a second separation stage (in the presence of minor amounts of copper).     

Foam Fractionation and Precipitate Flotation of Zinc(II)

Abstract

The hydrolytic behavior of a metal can be related to its removal by foaming. In this study the effect of pH and ionic strength on the foam separation of 0.1 mM zinc (II) was investigated using different concentrations of sodium lauryl sulfate as the collector. At low pH Zn²⁺ ion was removed by foam fractionation while above pH 8 Zn(OH)²(s) was removed by precipitate flotation. The results demonstrate that precipitate flotation is a more efficient removal process than the foam separation of soluble metal species.     

Manganese Removal from Water by a Precipitate Flotation Technique

Abstract

Microgas dispersions were used to remove manganese from dilute aqueous solution by a precipitate flotation technique. Manganese in its coagulated oxide form is difficult to remove from water by other methods, such as filtration. Flotation processes appear to be more suited to continuous manganese dioxide removal than other conventional methods. Taking advantage of the tendency for manganese dioxide to coagulate, manganese removals as high as 98% were observed for continuous flotation when the metal was present in only trace quantites (2 to 5 mg/L).     

磷矿浮选进展

本文在收集大量资料的基础上,从浮选工艺及药剂等方面详细总结了近年来国内外磷矿浮选的进展情况进而提出了磷矿浮选所面临的问题和对策。     

浮选柱在磷矿选矿中的应用研究

采用浮选柱设备进行磷矿的选矿实验研究。通过化学法分析磷矿的矿物特性,采用浮选柱分选技术,开展磷矿精选试验。结果表明,在充气量为6～10 L/h,冲洗水2～3 L/h可以得到w(P2O5)=30%以上的磷精矿。     

醚烷基磷酸酯浮选磷矿石的研究

合成的醚烷基磷酸酯捕收剂,在弱碱性介质中分选磷矿石,有较好的抗硬水性。对磷矿石的浮选效果比使用脂肪酸皂作捕收剂的指标好,碳酸钠用量显著降低。     

Precipitate flotation. IV. Flotation of silver,uranium and gold

The conditions for the flotation of silver using α-nitroso-β-naphthol and β-nitroso-α-naphthol, that of uranium using α-nitroso-β-naphthol and benzoylacetone, and that of gold using phenyl-α-pyridylketoxime were examined. Recoveries of over 90% were possible from 5 × 10^?5 M solutions of silver, 10^?4 M solutions of uranium (VI) and 3 × 10^?4 M solutions of gold (III). Extractions were best in the pH range 7–9, 6–9 and 3–5 respectively. Silver could be separated from 10-fold molar excesses of copper, zinc and lead; uranium from 10-fold molar excesses of gold and iron and 100-fold molar excesses of sulphate and manganese: gold from a 10-fold molar excess of uranium. Methods are suggested whereby redispersion in precipitate flotation of the second kind can be avoided. The efficiency of this kind of flotation is considered.     

浮选磷矿尾矿再选试验探索

云南某磷矿浮选尾矿主要矿物为胶磷矿,脉石矿物为石英-硅酸盐类矿物。对该浮选尾矿进行工艺矿物学研究和再磨再选试验,结果表明,可以获得磷精矿品位26.96%,回收率65.79%,尾矿磷品位4.72%的良好指标。     

Precipitate Foam Flotation of Copper,Nickel, Cobalt,and Manganese with LIX Reagents

Abstract

The precipitate flotation of copper, nickel, cobalt, manganese, zinc, and cadmium with LIX65 and LIX63 (hydroxyoxime compounds) and carrier surfactants hexadecyltrimethylammonium bromide and TX100 was investigated. The effects of pH and possibly interfering ions (sulfate, phosphate, EDTA) were studied. LIX65 was found to give good results with copper, nickel, cobalt, and manganese; LIX63 was less satisfactory.     

Improved Phosphate Flotation Using Clay Binder

The presence of insoluble clay slimes in phosphate ore adversely affect phosphate flotation performance. In this study, the feasibility of using a clay binder as slime depressant for phosphate flotation was investigated by conducting batch mechanical flotation tests using a 16-200 mesh phosphate sample under various operating conditions. The flotation process parameters examined for their impacts on clay binder performance included collector dosage, binder dosage and conditioning time, flotation time, etc. Results have shown that use of 0.1 lb/t clay binder increased phosphate yield and recovery by 1.7% and 5.5% respectively with a two min. flotation time. The concentrate grade was essentially constant at about 24%. The highest yield of 16.09% and the highest recovery of 91.01% were obtained with 0.25 lb/t clay binder.     

磷矿浮选捕收剂的优化应用

通过加强浮选捕收剂在生产实际中的优化应用与调整,将捕收剂现配制使用质量分数由10%调整为5%,一次性一点给药调整为分段多点加药,药剂用量降低,起到了降低成本,提高产品质量、稳定流程效果。     

瓮福磷矿穿岩洞矿段磷矿石选矿研究

对瓮福磷矿穿岩洞矿段混合磷矿石进行了直接浮选、单－反浮选、反－正浮选和正－反浮选４种工艺流程的选别试验,结果表明,采用正－反浮选和反－浮选工艺处理该磷矿石,均可取得较好的试验指标。综合评价推荐的流程是正－反浮选流程。     

Studies on the Separation of Cadmium from Solutions by Foam Separation. II. Precipitate Flotation of Cadmium Hydroxide

Abstract

Foam separation of cadmium in relation to pH from solutions of different metal concentrations was carried out by means of lauryl sulfate. The effect of inert salt on the removal of cadmium hydroxide and cadmium cations by adsorbing colloid floation was also studied. The precipitate flotation results reflect the precipitation of the metal in the form of a hydroxide. The precipitation pH values calculated are approximately those at which cadmium removal over 50% is obtained. The presence of electrolyte has a negative effect on the results of precipitate flotation of cadmium hydroxide and adsorbing colloid flotation of cadmium cations with lauryl sulfate.     

矾山磷矿浮选药剂及精矿除铁镁研究

对氧化石蜡皂,Ｈ９０７,ＲＭ－２及自制捕收剂分别进行了试验,结果表明自制捕收剂起泡性好,捕收能力强,浮选温度低,缺点是泡沫粘性大。此外还对降低精矿中铁镁杂质含量进行了研究,发现硅酸钠是提高精矿品位和降低铁镁等杂质的有效抑制剂。     

磷矿浮选厂废水的处理及循环利用

根据磷矿浮选工艺要求和废水的性质，对废水按浮选作业分别循环回用工艺进行了试验研究，基本达到回水的100％利用，即“零排放”。该工艺既防止了废水对环境的潜在污染，降低了浮选药剂消耗，又充分利用了水资源。     

磷矿石细度对浮选倍半氧化物的影响

在钙镁磷肥的生产过程中,倍半氧化物是有害杂质,会降低生产能力和磷的回收率,容易造成管道的堵塞。为了有效地降低磷矿石中倍半氧化物含量,来降低后续加工的处理难度,高效地回收磷资源,对贵州瓮福磷矿石进行了试验研究:采用阶段磨阶段选的双反浮选方法,获得在磨矿细度为-0.075 mm占70%时,磷精矿中P2O5的品位为29.02%,R2O3的品位为4.34%,P2O5的回收率为81.79%的指标。     

云南晋宁磷矿浮选废水处理研究

在磷矿的正反浮选中,由于矿浆不同的pH值条件,磷矿石的多样性,矿浆中无机离子及药剂组份表现出不同的特性,正浮选尾矿水、反浮选精矿水及反浮选尾矿水差异性很大,将所有选矿废水集中收集,不经处理统一回用显然是行不通的。絮凝沉淀法是处理晋宁磷矿浮选废水的有效方法之一,石灰与碳酸钠或磷酸钠配合使用都可以用来处理浮选废水。当氧化钙用量为4.0 kg/m3、碳酸钠用量为0.6 kg/m3时,闭路流程试验最终精矿w(P2O5)=29.66%,回收率达77.38%;当氧化钙用量为2.0 kg/m3、十二水磷酸钠用量为0.2 kg/m3时,最终精矿w(P2O5)=30.22%,回收率76.74%。此方法处理后的废水回用对浮选过程影响不大,且简单易行,工业上容易实施。     

磷矿浮选抑制剂研究进展

为了绿色高效地开发利用磷矿资源,综述了近年来国内外部分磷矿浮选药剂的文献资料。详细介绍了磷矿浮选中抑制剂的研究进展,并提出了今后的发展趋势。     

Calcite Flotation in Potassium Oleate/Potassium Dihydrogen Phosphate System

Calcite flotation in acidic media is a difficult task due to the solubility of calcite and consequently the release of calcium ions in the flotation pulp. In addition, the interaction of calcium ions with the flotation reagents requires the correct selection of these reagents. In this study, potassium oleate and potassium dihydrogen phosphate (KH₂PO₄) were used as collector and depressant, respectively. Micro‐flotation experiments were conducted to probe the effect of these chemical reagents as well as their interaction on calcite flotation using H₂SO₄ as a pH regulator. In addition, to elucidate the depressing action of KH₂PO₄ on calcite, electrokinetic properties of calcite have been measured in relation to pH and in the absence and presence of KH₂PO₄. Moreover, thermodynamic calculations were used to rationalize the reasons for calcite depression as well as the adsorption mechanism of KH₂PO₄ onto the calcite surface.