DE1910969A1 - Foam flotation for the enrichment of non-pretreated ores and minerals - Google Patents

Description

D e c h r e ctio n g Foam flotation for the enrichment of non-pretreated Ores and minerals.

You already have a flotation cell with a nozzle plate across it the lower part of the flotation cell proposed for even distribution of air and water, which from this lower or bottom part in the actual Flotation or foam chamber was used to prepare the one-day goods. BeS one Such flotation is usually the flotation aid to be processed Well added before feeding into the flotation cell or directly into it together with brought to the estate. However, such procedures are not entirely satisfactory, since the sludge present in the feed material unduly affects the flotation aids consumed, this leads to an inadequate concentration of flotation aids in the suspension or to excessive consumption of reagent. To these disadvantages To overcome the mud, it has already been suggested to use plotting tools below to a point at which the feed material reaches the flotation cell (USA patent 2,758,714). This method was also unsatisfactory because it varied from place to place Concentrations Flotation aids occurred. This has again the disadvantage that the flotation is sometimes insufficient.

It has been found that you can float very effectively and thereby use small amounts of flotation aid if you first prepare an intimate mixture of the flotation aid in water and air. The invention thus relates to a method for flotation of ores and minerals, in which an intimate mixture of flotation aid, water and air is formed and the material to be treated is then treated with this mixture. In a preferred embodiment of the method according to the invention, the material to be floated is introduced into the flotation cell with a relatively calm foam chamber, air, water and flotation aid being introduced into a mixing chamber located below the foam chamber, in which an intimate dispersion and uniform distribution of this dispersion is achieved in the mixing chamber as well as in the foam chamber with the ores and minerals.

.For the implementation of the inventive method he can be any use any known z flotation cell. However, preference is given to flotation cell in which the feed material and water are fed into the cell floor. Cells according to the earlier USA application serial number 446 546 are particularly suitable these are preferred for the reason that an intimate mixture of air, Water and flotation aid below the nozzle plate on the narrowed point of the cell and this mixture for a very efficient flotation can be distributed very evenly.

All ores and minerals can be prepared by the process according to the invention that do not require pretreatment with the flotation aid. For example, the method according to the invention is not suitable for anion-active Collector for the flotation of phosphates, but for the cationic flotation of phosphates using Amfnea, the inventive method is suitable for Foam flotation of ores such as copper, zinc, lead, iron but also for coal flotation.

The previously used flotation aids can be used. Customary fatty acid amines can optionally be used for the cationic flotation of phosphates use in conjunction with petroleum. For the flotation of copper ores and coal you can use methyl amyl alcohol and, for coal flotation, a light oil such as diesel oil or light petroleum, preferably in combination with methyl amyl alcohol. In the same way, methanol and other alcohols, xanthates and the like are also suitable known flotation aids for the froth flotation of minerals and ores. The chemicals to be used in each case depend on the material to be processed.

The inventive method is particularly suitable for Cationic foam flotation of phosphates to separate the silicates. Usual Cationic flotation aids are mixed with air and water in the bottom area of the Cell mixed until there is a substantially homogeneous dispersion of air.

Receives water and flotation aids. It is known that flotation The finer the air bubbles, the more effective it is.

Such an intimate mixture is achieved by adding the flotation aid the water in an aspirator as described in the earlier American patent application has been proposed is added. However, you can also use the mixture mechanical mixer in the bottom area of the cell, preferably in the sense of the older ones American patent application, with this mixer inside the nozzle plate is arranged in the narrowed cell area.

The proportions of flotation aids depend on the type of used Chemicals, the amount of sludge and the phase cal properties, in particular of the goods to be processed. This can be easily ascertained by means of a few examples. With phosphates of different sludge content one becomes fatty acid amine in one Amount of about 45 to 450 g per ton (0.1 to 1 lbs per long ton) get by.

The invention is illustrated by the following examples: Example 1 Cationic phosphate flotation using one device, namely one single flotation cell according to the earlier American patent application with 35 Parts of fatty acid reacted with diethylenetriamine and 65 parts of kerosene as a flotation aid using the feed speeds described there for flotation aids and input goods. In one attempt the flotation aid was put on top of the cell used together with the feed in the usual way. Make a second attempt became the reaction aid below the nozzle plate with the air and the water The results are summarized in the table.

TABLE Type of task Concentrate Gait Conc. Ratio. Separation addition BPL BPL Insol BPL sharpened un @ en 34.5 60.0 24.8 3.29 1.81 96 above 34.5 53.2 32.6 3.40 1.60 96 @on @@@ method according to the invention you get an h @@@ @@@@ @@ BPL however, by the usual method only 53 BPL with the same selectivity. Due to the premixing of flotation aid, air and water according to the invention a very finer, richer bubble structure was achieved in the foam.

Example II In the apparatus of Example 1, a copper ore with a mixture of sodium xanthate and methylamyl alcohol as a flotation aid processed. Here, too, the flotation aid was used again in our experiment at the top in the cell and below in a further according to the method according to the invention of the nozzle plate in the area of the cell floor as a premix with water and air. The process according to the invention gave a higher copper concentrate.

Example III Using the apparatus of Example I were Processed coal, zinc, lead and iron ores. Here, too, the flotation aid was used again once given up in the cell and the other time according to the invention Procedure as a premix with air and water. In all cases one obtained according to the invention higher concentrates.

PATENT CLAIMS

Claims (4)

P a t e n t a n s p r ü c h e 1. Process for foam flotation of Ores and minerals that do not require pre-treatment with the flotation aid, by noting that the slurry of the goods is converted into a Foam chamber is fed with a relatively steady flow and one is fed into this volume Introduces premix in an even distribution, which is placed in a mixing chamber below the foam chamber in the flotation cell made of water, air and flotation aids has produced, the premix in the mixing chamber is a sufficiently higher possesses hydrostatic pressure than it prevails in the foam chamber to a backflow to prevent the dispersion of material from the foam chamber into the mixing chamber, and one in the usual way the foam on top and the non-creamed dispersion on the bottom the foam chamber discharges. 2. The method according to claim 1, characterized in that g e k e n n -z e i c h n e t that the pressure between the premix in the mixing chamber and the material dispersion is at least 350 mm WS (0.5 psi) in the foam chamber. 3. The method according to claim 1, characterized in that g e k e n n -z e i c h n e t that phosphate rock is prepared by cationic flotation. 4. The method of claim 1 or 2, characterized in that g e k e n n -z e i c h n e t that coal is processed with methyl amyl alcohol and kerosene.