DD257398A1 - PROCESS FOR FLOTATION OF ANHYDRITE / GIPS - Google Patents

Abstract

The invention relates to a process for the flotation of anhydrite / gypsum, in particular from aggregates with quartz, calcite, fluorite and barite as accompanying minerals. In the invention, the separation of the anhydrite / gypsum from the minor components takes place. The object is achieved in accordance with the invention by using N-alkanoyl or N-alkenoylaminocarboxylic acids or N-alkanoyl or N-alkenoyl-N-alkylaminocarboxylic acids or salts thereof as a collector in combination with regulating reagents.

Description

It is essential to the invention that the collectors are used as aqueous emulsion or in the form of their soluble salts as only one compound of the type N-alkanoyl or N-alkenoylaminocarboxylic acid or N-alkanoyl or N-alkenoyl-N-alkylaminocarboxylic acids or as a combination of several of these compounds become.

Furthermore, it is essential to the invention that pushers are used as regulating reagents.

The flotation succeeds over a large pH range and is preferably carried out in the alkaline region.

In flotation, the collector according to the invention makes it possible to directly dispense quartz-poor anhydrite / gypsum concentrates, while the accompanying minerals are not co-flotated by the use of pushers but remain in the mountains.

The invention will be explained in more detail with reference to an embodiment.

embodiment

Flotation of a natural heap (basic flotation with purification stages) according to the figure Grain size of the material to be floated: <0.16 mm Chemical composition: 50.1% CaSO ₄

31.5% SiO ₂ . , Remainder: mainly CaCO ₃

Collector: 500g / t Purpose Cordesin 0, converted into the Na salt with NaOH, 1% solution, Cordesin 0 is a technical product and contains as main component N-methyl-N-oleoylaminoacetic acid CHv- (CH ₀ ) "-OS = CH- (CH ₉ ) ₇ -CH-CH ₉ -COOH

Pusher: 700 g / t water glass

pH regulator: HCI

Laboratory flotation apparatus: 2 (cell (basic flotation)

11-cell (cleaning flotation)

mitFingerrührer

Solids weight: 600g (2l-cell), 300g (11-cell)

Stirrer speed: 1 40OmJn " ¹ (21-ZeIIe)

1200 min ' ¹ (11-cell)

Air volume: 0.5m ³ / m ³ -min

Turbidity temperature: room temperature (20-22 ⁰ C)

Medium: tap water

pH value: 7.0

Experimental procedure: (FIG. 1)

Grundflotation:

Suspend the solid, pH control 3 min

Pusher addition and agitation 3min

Collector allowance and agitation 2 min

Flotation 6 min

Reinigungsflotation:

1. Cleaning Flotation:

Concentrate of the base float was floated again with the addition of 10Og / t of water glass: suspension of the solid, pH control 3 min

Pusher addition and agitation 2min

Flotation 3 min

2. Cleaning Flotation:

Concentrate of the first cleaning flotation without the addition of further flotation reagents was floated again: suspension of the solid, pH control 3 min

Flotation 2 min

3. Cleaning flotation

Concentrate of the 2nd purification flotation without the addition of further flotation reagents was floated again: suspension of the solid, pH control 3 min

Flotation 1 min

Results: basic flotation with 3 cleanings

Rcaso "

B 9.65 72.3 6.6 B1 31.5 52.9 3.1 B2 60.1 25.3 5.5 B3 71.9 12.3 13.3 K3 76.4 3.73 73.5

When recovering the intermediate residues (mountains B1, B2, B3) into the corresponding flotation stages, higher yield values are to be expected.

Claims (4)

1. A process for the flotation of anhydrite / gypsum from mineral raw materials, characterized in that as a collector compounds of the type N-acylaminocarboxylic acids and N-acyl-N-alkylaminocarboxylic acids of the general formula R-CO-li- (GH ₂ ) _n -COOH R 'η = 1, 2, 3 or their salts, wherein R is a saturated or unsaturated aliphatic hydrocarbon chain having 8 to 20C atoms and R 'is a hydrogen atom or a short-chain hydrocarbon chain, which are used in combination with regulatory reagents. 2. The method according to claim 1, characterized in that the collectors are used as an aqueous emulsion or in the form of their soluble salts. 3. The method according to claim 1 and 2, characterized in that only one compound of the type N-acylaminocarboxylic acids, N-acyl-N-alkylaminocarboxylic acids or a combination of several of these compounds are used as a collector. 4. The method according to claim 1, characterized in that pushers are used as regulatory reagents. For this 1 page drawing Field of application of the invention The invention relates to a process for the flotation of anhydrite / gypsum, in particular from aggregates, which contain quartz, calcite, fluorite and barite as accompanying minerals. Characteristic of the known technical solutions It is known that anhydrite / gypsum is floated with alkyl sulfates, alkanesulfonates, sulfonated carboxylic acids, carboxylic acids and their soaps. So far, no method has become known that the direct separation of the anhydrite / gypsum from quartz describes as Hauptbegleitmineral, so that high-quality low-quartz anhydrite / gypsum concentrates so far could not e / be witnessed. It is known that the flotation of kieserite, langbeinite and anhydrite can be carried out in water or low-electrolyte solutions with primary alkylamines or their salts (DE-PS 1159 871) and a separation of these minerals is possible from each other when adjusting the corresponding pH. Furthermore, it is known that anhydrite low kieserite, langbeinite or Polykalitkonzentrate of saline solutions with high electrolyte concentrations using a collector of the type N-alkanoyl or N-alkenoyl-aminocarboxylic or N-alkanoyl or N-alkenoyl-N-alkylaminocarboxylic produced can be (DE-PS 220237). However, it is a saturated salt solution and also the anhydrite remains in the residue. Object of the invention '. The aim of the invention is the flotative separation of anhydrite / gypsum from accompanying minerals, with a high anhydrite / Gipsausbringen and low levels of quartz in the anhydrite / gypsum concentrate and low collector consumption can be achieved. Explanation of the essence of the invention The invention has for its object to separate anhydrite / gypsum from the companion mineral quartz by direct flotation and to produce low-quartz anhydrite / gypsum concentrates. This object is achieved in that as a collector compounds of the type N-acylaminocarboxylic acids and N-acyl-N-alkylaminocarboxylic acids of the general formula R-G0-K- _{(CH2) n} -G00H ^(Me). R »η = 1, 2, 3 or their salts are used in combination with regulatory reagents. The chain length of the nonpolar saturated or unsaturated aliphatic collector moiety R is between 8 and 20 carbon atoms, while R 'represents a Η-atom or a short-chain aliphatic hydrocarbon chain.