CS239656B1 - Method of depression of ferrous sulphide in flotatwion of complex sulphidie raw materials - Google Patents

Abstract

Method of depression of sulfide minerals iron in the complex sulfide flotation ores. The purpose of the method is to create the optimum methods for the preparation of collective concentrates non-ferrous metals such as copper, lead, and zinc, low iron content from complex carbon black ores. The goal was achieved without use The usual iron sulphide depreeors only agitation with a dose of heavy metal salt and vortex a type of precipitate such as sulfhydril. Particularly preferred is a combination of a heavy metal salt, copper sulphate, with little solubility a heavy metal compound is collected

Description

The invention relates to a process for depressing iron sulphide minerals in the flotation of complex sulphide ores, in particular for the production of low-iron collective concentrates, e.g.

So far, the alkaline environment of mash, calcium hydroxide, alkali cyanides, or complex cyanides, sulfur reducing compounds such as alkali sulfites, hydrogen sulfites, thiosulfates, sulfur dioxide has been used to depress iron sulfides.

Furthermore, some selective organic depressants, eg based on cyanohydrins or selective pantographs, respectively. combinations of the above methods. If we are faced with the problem of producing low or ferrous non-ferrous metal concentrates, the production of which is advantageous in terms of reducing further processing and transport costs or simplifying the downstream processing technology, the methods of iron sulphide depression used hitherto encounter the problems of that:

1 / are not effective enough,

2) in addition to iron sulphides, some of the other useful minerals are suppressed, eg the use of high alkalinity of mash or calcium hydroxide reduces the flotability of lead minerals; when using cyanides, complex cyanides or reducing sulfur compounds, zinc air tanks are suppressed simultaneously with iron sulfides)

3 / many of these methods require large doses of depressants, many of which are harmful to health and water management.

The above-mentioned disadvantages are solved by the method of depressing iron oxide minerals in the flotation of complex sulphide ores, in particular in the production of low-iron concentrates according to the invention, which is based on the fact that the mash agitates with heavy metal salts such as copper sulfate, cuprous chloride and lead nitrate, wherein the heavy metal salt can be dosed as a low-soluble heavy metal compound with a collector. Or the mash is agitated with a heavy metal salt and a low-soluble heavy metal compound with a collector. for example, a disulfide-based sulfhydril type, whereby the heavy metal salt can be metered into the mash before the collector charge or the charge is collected. its heavy metal compounds.

The depression method according to the invention makes it possible to separate iron sulfides from other useful minerals, for example lead sulfides, zinc sulfides, copper, which are converted into either collective or selective concentrates. This method makes it possible in a simple way to significantly reduce the flotability of iron sulfides while maintaining the flotability of other useful minerals.

The process does not require the use of conventional depressants to suppress iron sulfides, such as calcium hydroxide, alkaline cyanides, and allows the elimination of the application of some toxic or waterborne reagents. The process of the invention is thus a substantial simplification of the reagent regimen, and in addition utilizes heavy metal salts, e.g., copper sulfate, which are common activators of, e.g., zinc sulfides.

The method can be applied both to selective flotation in the making of certain sulfides, eg sphalerite, from iron sulfides, and in collective flotation. The process creates favorable conditions for introducing the preparation of collective concentrates with a reduced iron content, which places lower demands on processing theohnology.

Example

It has been verified that by increasing the dose of a heavy metal salt such as cupric sulphate, used hitherto as an activator of certain types of sulphide minerals, it acts on the banquet at low dose collectors (of the order of 10-20 g / t potassium ethylxanthate). sulfhydryl groups -SH or -SUe, non-polar organic compounds based on disulfides, respectively. polysulfides, reducing the flotability of iron sulfides without substantially altering the flotability of other sulfides. For illustrative purposes, the following tables give examples of laboratory results on lead-zinc ore.

In the first table ae, these are tests with a variable dose of copper sulphate. The potassium ethylxanthogenate collector dose is 10 g / t, foams are 20 g / t, flotation time is 12 min. The product was not reclassified.

Table 1

Batch Dilution Yield

CuSO ₄ .5 HjO (#wt.) (#wt.) / g / t / Pb Zn Pe Pb Zn Pe 0 6.60 . 7.85 21.49 76.8 34.0 43.7 100 ALIGN! 5.26 14.01 18.77 80.5 82.3 52.4 150 5.93 22.4 8.84 77.2 87.7 19.8 250 6.34 27.34 4.08 74.9 86.4 8.1 350 6.01 25.47 4.54 76.2 88.5 10.1 500 6.93 24.47 5.06 79.3 89.6 11.4

As can be seen, increasing the copper sulfate dose above a certain level leads to a significant reduction in iron recovery.

The second factor influencing the result of the process according to the invention is the amount of the collector to be dosed, the effect of which is shown in the test series (Table 2).

The amount of copper sulphate pentahydrate is 350 g / t, foam is 20 g / t, the flotation time is 12 min, the product is not refolded and the collector is potassium ethylxanthogenate.

Table 2

Batch Flatness Collector yield (% by weight) (% by weight)

/ g / t / Pb Zn Pe Pb Zn Pe 10 6.01 25.47 4.54 76.2 88.5 10.1 20 May 4.25 18.96 9.36 76.0 92.3 22.0 30 5.04 16.55 15.36 84.1 92.8 47.4

From the results shown in Table 2, it is apparent that the process is highly sensitive to the exact dosages of the individual reagents, especially the pantograph. Dosing requirements can be limited by the fact that the collector is dosed in the form of a poorly soluble compound with a heavy metal or a heavy metal compound. as a mixture of a conventional collector, e.g. of the sulfhydril type or based on disulfides, and a sparingly soluble compound

Heavy metal collectors, eg cupric ethylxanthate, as shown in Table 3.

The amount of sulphate and magnesium pentahydrate is 350 g / t, foam is 20 g / t, the flotation time is 12 min and the product has not been renumbered. The dose of cupric ethylxanthogenate and ethyldixanthogenate is converted to the equivalent of potassium ethylxanthogenate.

Table 3

Collectivity Collector yield (56 wt.) (56 wt.)

/ g / t / Pb Zn Fe Pb Zn Fe 10 8.23 17.84 4.90 73.6 76.5 8.9 30 11.78 21.45 5.08 86.4 88.2 11.4 50 8.54 23.30 7.56 82.6 92.8 15.5 75 5.11 15.57 13.63 76.8 94.4 40.9

SUBJECT OF THE INVENTION

Claims (5)

1. A method of depressing iron sulfide minerals in the flotation of complex sulfide ores such as lead-zinc, copper-lead-zinc and copper-lead, in particular in the production of low-iron collective concentrates flotated by conventional collectors, e.g. SH or -Sulfates or organic compounds based on disulphides or polysulphides, characterized in that the mash is agitated and charged with a heavy metal salt such as copper sulphate, cuprous chloride, silver nitrate and lead nitrate. 2. A process according to claim 1, wherein the heavy metal salt is metered as a water-soluble heavy metal compound with a collector which is a copper (II) ethylxanthate. 3. A process according to claim 1, wherein the mash is agitated with a heavy metal salt and a poorly soluble heavy metal compound by a collector. 4. A method according to claim 1, 2 and 3, characterized in that the ee routine is agitating with a heavy metal salt, e.g. e.g., copper (I) ethylxanthogenate and a skimmer, e.g. of the sulfyldril type or based on dlsulfides. Method according to Claims 1, 2 and 4, characterized in that the heavy metal salt is metered into the mash by a batch or collector charge. its compounds and heavy metal.