富氧熔炼技术在高硅浮选尾矿处置领域的研究初探

黄金氰化尾渣生产硫铁精矿粉后剩余的高硅浮选尾矿的存量庞大,给企业及环境造成巨大压力。目前对高硅浮选尾矿实现工业化生产的只有回转窑火法冶炼,但其存在诸多问题。文章对采用富氧侧吹熔池熔炼处理高硅浮选尾矿的试验研究做了简要介绍,此试验开创了富氧侧吹炉处理氰化尾渣的先河。通过试验验证了富氧侧吹炉大批量处理高硅浮选尾矿在技术上流程上是可行的。

美国佛罗里达pebble磷矿浮选流程试验

本文对美国佛罗里达pebble磷矿进行了浮选流程试验,试验采用了3种流程,即硅浮选—镁浮选流程,镁浮选—硅浮选流程和镁浮选—脱泥—硅浮选流程。试验结果表明:镁浮选—脱泥—硅浮选流程得到的精矿不但质量较好,而且有较高的P2O5回收率,其综合精矿P2O5品位为30.45%,MgO质量分数为0.98%,P2O5回收率为80.13%。镁浮选—脱泥—硅浮选流程具有流程及药剂制度简单,药剂用量少,试验指标高等优点,是美国佛罗里达pebble磷矿综合利用的有效方法。

Flotation of low-grade bauxite using organosilicon cationic collector and starch depressant

The flotation of diaspore and three kinds of silicate minerals, including kaolinite, illite and pyrophyllite, using an organosilicon cationic surfactant (TAS101) as collector and starch as depressant was investigated. The results show that both diaspore and aluminosilicate minerals float readily with organosilicon cationic collector TAS101 at pH values of 4 to 10. Starch has a strong depression effect for diaspore in the alkaline pH region but has little influence on the flotation of aluminosilicate minerals. It is possible to separate diaspore from aluminosilicate minerals using the organosilicon cationic collector and starch depressant. Further studies of bauxite ore flotation were also conducted, and the reverse flotation separation process was adopted. The concentrates with the mass ratio of Al2O3 to SiO2 of 9.58 and Al2O3 recovery of 83.34% are obtained from natural bauxite ore with the mass ratio of Al2O3 to SiO2 of 6.1 at pH value of 11 using the organosilicon cationic collector and starch depressant.

A comparison of anionic and cationic flotation of a siliceous phosphate rock in a column flotation cell

Flotation performance of a de-slimed（-150＋53μm）Jordanian siliceous phosphate was evaluated in a batch laboratory flotation column 100 cm high and 5 cm inside diameter.The collector used during anionic flotation was sodium oleate while an amine acetate（AEROMINE 3100C）was used for cationic flotation.Flotation comparison at different collector dosage,superficial gas velocity,and frother concentration showed that the maximum difference in performance between cationic and anionic flotation was obtained with these flotation parameters：30×10^（-6）（mg/L）frother concentration,250 g/t collector concentration,and 3.4 cm/s superficial gas velocity.At these operating conditions amine （cationic）flotation gave 7%higher flotation recovery,a 6%cleaner concentrate grade,and was 6%more efficient at removing silica.

Typical roles of metal ions in mineral flotation:A review

In flotation,metal ions possess significant roles that are usually fulfilled by either selectively activating or depressing the target minerals.Despite that tremendous efforts have been made to address the roles of metal ions in flotation,it still lacks a comprehensive review,especially to compare various ions instead of focusing on a specific one.This review begins by elaborately categorizing the factors involved in affecting the roles of metal ions in flotation.After that,well-accepted mechanisms are updated and discussed from the ore type.Furthermore,typical approaches to explore the underlying mechanisms are emphasized,including traditional techniques such as micro-flotation,contact angle measurement,zeta potential measurement,and other recent prevailing methodologies,like computational method,solution chemistry calculation,and cyclic voltammetry.This work will pave the way to promote flotations via activities like selectively adding/reducing metal ions,choosing reagents,and regulating the slurry chemistry.

Effects of different factors during the de-silication of diaspore by direct flotation

Most of the bauxite resources in China are kaolinite-diaspore bauxite of middle to low grade, with a fine dissemination, and are difficultly separated. Direct flotation de-silication has been shown to be an effec- tive method for de-silication of diaspore. In this study the effect of different factors, including pulp tem- perature, density, pH value, depressant, and collector dosage, on direct flotation of diaspore were investigated by laboratory experiments. The optimum conditions were identified and the flotation perfor- mance was improved. The results show that under optimum conditions （a pulp temperature around 40℃, a pulp density from 30% to 33g, a pH value from 9.0 to 10.0, an air flow rate of 0.5 m3/（m2 rain）, a dispersant level from 35 to 70 g/t, and a collector level around 1000 g/t） an AI/Si ratio of 6.97 is obtained starting from an initial Al/Si ratio of about 4.71. The recovery of A1203 under these conditions was 86.94%.

Selective separation of silica from a siliceous-calcareous phosphate rock

Selective separation of silica from a siliceous-calcareous phosphate ore that had been sieved into different size fractions is investigated by a combination of chemical analysis,zeta potential measurement and FTIR and XPS techniques.Scrubbing is a better choice than flotation for removing silica from the coarse fractions.The P_2O_5 grade of the coarse fractions is increased to about 30%by scrubbing and the product yields are higher than those obtained by flotation.The silica in the fine fraction is separated by reverse flotation.An alkyl amine salt(DAH)is an effective collector and the P_2O_5 grade of the fine fraction can be increased by 7%to beyond 30%under acidic conditions.The higher zeta potential obtained using DAH suggests that it is more strongly absorbed onto the ore particles than the other cationic collectors. FTIR and XPS results confirm physical absorption of the cationic collector onto the ore surface.They also indicate that calcite is dissolved at low pH values,which increases the Si concentration on the ore surface.

Separation of azodicarbonamide from surface of diatomite by froth flotation

The separation of azodicarbonamide(AC)from the surface of diatomite by froth flotation is investigated in this research.Pure samples of diatomite,AC and1:1mixtures of the two were floated in a lab-scale flotation cell withcollector dosage,frother type and dosage,and pH varied to determine the optimum experimental conditions.The diatomite sample and products from flotation tests were characterized using scanning electron microscopy(SEM)equipped with energy dispersive X-ray spectroscopy(EDX).The results of the flotation tests indicate that there is less AC on the surface of diatomite after flotation compared to the feed,while the AC present in diatomite pores remains unchanged.Additionally,Fourier transform infrared spectroscopy(FT-IR)was employed to study the mechanism of interaction between reagents and minerals.

Flotation tree analysis for recovery of sillimanite from red sediments

In this paper an attempt is made to recover sillimanite by flotation tree analysis process and conventional flotation process from non magnetic fraction of red sediments.The experimental results of both the processes are presented.The data reveal that the deslimed sample contains 33.2%(by weight) total heavy minerals and out of which the sillimanite mineral content is 3.6%(by weight).It is observed that flotation tree analysis needs 10 cells to get five output products and where as conventional flotation process needs 15 cells to recover similar grade of five output products.Thus,flotation tree analysis is not only economic process but also efficient process(to say efficient process,the tree analysis product should be higher grade).

从选矿新技术进展看酒钢矿石选矿

本文根据近几年国内外选矿的新技术、新设备、新工艺发展情况,结合酒钢选矿厂矿石入磨粒度太粗,磨矿粒度也偏粗,不能适应铁矿物充分单体解离的要求及磁选选别效率偏低,精矿石硅含量高等问题提出了改进的措施及建议,望公司能积极应对。

Various Methods Used for the Treatment of the Wet-Phosphoric Acid

Phosphoric acid obtained by the wet process is laden with impurities which limit its use in fertilizers. To expand its range of use, various methods have been proposed to purify it which range from simple fading-clarification to more complex operations. These processes include essentially the liquid-liquid extraction, chemical precipitation, ion flotation, adsorption on activated carbon, ion exchange resins. However, the use of these techniques is limited to a number of disadvantages such as high operational cost, environmental pollution, complicated process, limited effectiveness, etc.. Our contribution for this domain （purification of wet-phosphoric acid） consists to use clays which could be adsorbent materials alternative to both economic and less polluting. These are phyllosilicates which have a large adsorption capacity due to their large specific surface and their surface charge. In this study, we will detail the processes which present great importance for the treatment of wet phosphoric acid.