SU818653A1 - Modifier for non-sulphide ore flotation - Google Patents

Description

one

The invention relates to the enrichment of minerals and can be used in flotation concentrators of Mintsvetmet and Minkhimprom of the USSR, processing non-sulphide

ore.

Currently, the most common modifying agents for non-sulphide ores are inorganic salts: sodium silicofluoride, phosphates, chromates and biochromates, aluminum sulphate and sodium silicate (liquid glass) 1.

In the practice of enrichment of fluorite ore, a combination of liquid glass with aluminum sulphate 2 is used.

Organic compounds are known to use starch, dextrin, sulfite-alcohol stillage, carboxymethylcellulose (CMC) 3, a collagen-tannid solution 4, a combination of tylose or starch with water-soluble urea formaldehyde resins 5.

The disadvantage of using liquid glass is the non-selectivity of its action, and organic reagents - their high cost (CMC), production from food raw materials (starch, dextrin), low selectivity (sulfite-alcohol bard). The low efficiency of the action of the listed reagents is due to the fact that their molecules lack specific complexing groups capable of selectively interacting with metal cations included in the crystal lattices of the minerals to be separated.

Synthesis of modifiers containing specific complexing groups is the most promising direction for creating more efficient modifier reagents.

It is known compound ethylenediaminetetra- (methylphosphonic) acid 6. It

It is obtained from industrially available products: phosphorus trichloride, formaldehyde, and ethylenediamine or technical products containing it.

The aim of the invention is to find modifiers containing a specific complexing group, which allows expanding the range of modifier reagents and improving the technological indicators of the enrichment process (concentrate quality and recovery).

The goal is achieved by using ethylenediaminetetra- (methylphosphonic) acid (EDTP) as a modifier.

dHzPOjiij

X

tiH-CHy-N

CH2POjHz

This reagent is a representative of complexones containing phosphonic groups.

The use of phosphonate complexones is based on the fact that, depending on their structure (number of phosphonic groups, radical-aliphatic or aromatic, etc.), they form complexes of different strength. Thus, for monophosphonic acids, the stability constant of chelating agents with calcium does not exceed 1 (F, and for polyphosphonic acids it increases to 1 # -109.

One of the difficult objects for the flotation of non-sulphide ores is fluorite ores. The complexity of the enrichment of such ores is due to the fact that they contain calcite as a rock mineral, in the crystal lattice of which there is the same calcium cation as in fluorite. As a result, the concentrate is of poor quality or fluorite recovery decreases. Since calcium, located on the surface of fluorite and calcite, is distinguished by its complexing properties due to different anions and the influence of the crystal lattice of the mineral, EDTP containing a specific complex for the development of technological characteristics of flotation of fluorite ore was used.

grouping.

Example. Experiments flotation of fluorite ore.

Fluorite ore after grinding to a particle size of 73% of class minus 0.074 mm and the release of sulphides entered the fluorite flotation cycle. In addition to EDTF (variable costs), soda and liquid glass 3.0 and 0.5 kg / t were supplied to the main flotation, respectively. Oleic acid grade B in the form of an emulsion was used as a collector.

The benchmark experience is the experience that gives the optimum technological performance, delivered at the factory mode, where the combination of liquid glass with aluminum sulphate is used as modifiers.

The use of EDTP as a modifier allows one to drastically reduce the yield and improve the quality of the main flotation concentrate with a relatively small decrease in fluorite recovery. Thus, with the introduction of 200 g / t of EDTF, the content of fluorite in the concentrate, as compared with the reference experiment, increases by a factor of 2 from 31 to 61%. accordingly, the concentrate yield is also reduced by 2 times, the extraction varies from 92.9 to 90.4%. Optimally, one should consider that where the consumption of EDTF is 100 ppm: the fluorite content in the concentrate rises to 49%, the extraction practically does not change (within the limits of experimental error) -92.4%.

The experiments carried out in full with five cleaners showed the following. In the standard experiment with optimal consumption of liquid glass and aluminum sulphate supplied to the main flotation and cleaning, the quality of the concentrate was 91%, the extraction was 59.2%. When conducting an experiment with EDTP with the same amount

the removal of fluorite in the concentrate was able to increase to 93.45%. Soda, liquid glass, and EDTP were fed into the main flotation, and only one EDTP modifier was introduced into the cleaning.

The fluorite content in the concentrate, achieved in the reference experiment, 91% was obtained in the experiments with the use of EDTP as a result of a smaller number of cleanings (3-4), the extraction to concentrate of this quality was 3.5 times higher than in the experience with the reference modifiers.

Thus, the use of ethylenediaminetetra- (methylphosphonic) acid (EDTP) as a modifier makes it possible to significantly increase the selectivity of the process, which causes a significant increase in the quality of fluorite concentrate (from 91.05 to 93.45%) or with a constant quality -91% increase

extraction by 3.5%, to simplify the technological scheme of enrichment by reducing the number of clean-up operations, to reduce the front of cleanup flotation due to a sharp decrease in the yield of the concentrate of the main flotation from 31 to 20%.

Thus, the main advantage of the invention is to improve the technological performance of the flotation process of non-sulphide ores.

Claims (2)

1. Eigelles M. A. Reagents-regulators in the flotation process, M., “Subsurface, 1977, p. 87-99. 2. Mokrousov V. A. Enrichment of calcite-fluorite ores by flotation using aluminum salts. Mountain Journal 1945, No. 9, p. 27-30. 56 S. Eygeles M. A. Reagents-regulators 5. USSR author's certificate in the flotation process, M., “Nedra, No. 276845, cl. In 03D 1/02, 1970. with. 101-106.6. R. Irani, K. Moedritzer. I. orf. Chemist4 Copyright Certificate of the USSR, 1966, 31, 1603 (prototype). No. 309741, cl. B 03D 1/02, 1971.5 818653