Commonly used flotation agents for high carbon chromite

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When flotating high carbon chromite, the main method is to make the surface of chromite hydrophobic by adding flotation agents, and then separate chromite from gangue minerals by mineralization of bubbles. The selection of agents is particularly important in the flotation process. This article will focus on the types of commonly used concentrated high carbon chromite flotation agents.

At present, the commonly used mineral processing agents for high carbon chromite flotation are collectors, depressants, frothers and regulators.

1. High Carbon Chromite Collector

Fatty acid collector:Mainly oleic acid and sodium oleate. This type of collector has a good selective collection effect on chromite. Its working principle is to chemically adsorb fatty acid ions with metal ions on the surface of chromite to make the mineral surface hydrophobic. During use, there are certain requirements for the slurry temperature, and it is usually better at higher temperatures.

Hydroxamic acid collector:There are benzohydroxamic acid, salicylic hydroxamic acid, etc. Hydroxamic acid collectors can form stable chelates with metal ions on the surface of chromite, making the mineral surface hydrophobic. It has good selectivity and strong collection ability for chromite. However, the cost is relatively high and the synthesis process is relatively complicated.

2. High-carbon chromite inhibitors

Starch and its derivatives: There are corn starch, cassava starch, carboxymethyl starch, etc. Starch inhibitors mainly increase their hydrophilicity by adsorbing on the surface of carbonaceous materials and gangue minerals, thereby inhibiting their floating. When the dosage of this agent is large, it may have a certain inhibitory effect on the flotation of chromite.

Water glass: is mainly used to inhibit silicate gangue minerals in high carbon chromite beneficiation. Its mechanism of action is to form hydrophilic silicate colloids on the surface of gangue minerals to prevent the adsorption of collectors on the surface of gangue minerals. It has a good inhibitory effect and can adjust the pH and dispersibility of the slurry. However, excessive use may affect the flotation effect of chromite.

3. High carbon chromite frother

Pine alcohol oil: is a commonly used frother with good foaming performance and moderate foam stability. During the flotation process, it can produce a large number of small and uniform bubbles, which is conducive to the attachment of chromite particles and bubbles. The price is relatively low, but excessive use may cause excessive foam viscosity, affecting the flotation effect.

No. 2 oil: Its performance and foam stability are similar to those of pine oil. It can work synergistically with collectors to improve the flotation recovery rate of chromite. Within a certain range, it has good adaptability to different types of chromite ores. However, it is necessary to pay attention to the reasonable use with other reagents.

4. High-carbon chromite adjuster

pH adjuster: Commonly used are lime, sodium carbonate, etc. During the flotation process of high-carbon chromite, adjusting the pH value of the slurry can affect the electrical properties of the mineral surface and the adsorption properties of the reagent. Under alkaline conditions, the electrical properties of the chromite surface are conducive to the adsorption of the collector, thereby improving the flotation effect. However, too high or too low pH values may affect the mineral processing indicators and need to be adjusted according to the specific properties of the ore.

Dispersant: Sodium hexametaphosphate is commonly used, which prevents mineral particles from agglomerating in the slurry, maintains the dispersion of mineral particles, and increases the contact between minerals and reagents. For high-carbon chromite ores containing more fine-grained minerals, the use of dispersants can improve the mineral processing effect. However, the dosage needs to be properly controlled to avoid affecting the effects of other reagents.

As an important strategic resource, high-carbon chromite should be reasonably selected according to the properties of the ore and product requirements in the mineral processing method, so as to improve the mineral processing efficiency and product quality, and realize the efficient development and utilization of high-carbon chromite.