Hydrochloric Acid Leaching of Iron from Aluminous Clays

Pennsylvania has ample reserves of high-alumina clays which are potential sources of alumina, but many of these clays contain large amounts of iron, which makes them unsuitable for treatment by acid processes.

hydrochloric acid leaching source and chemical analysis

Of all the clay minerals tested, only gibbsite exhibits high acid solubility. Kaolinite, diaspore, and boehmite, which are the major alumina-bearing minerals in Pennsylvania clays, all display alumina losses of 1-2 percent for a one hour hydrochloric acid leach. This leads to the prediction that only 2-5 percent of the alumina in a Pennsylvania clay would be extracted by a hydrochloric acid leach for one hour at 104° C. The difference in acid solubility among the tested clay minerals has been attributed to their disparity in crystal structure.

hydrochloric acid leaching solubility

 

Sulfuric Acid Leaching of Iron from Clay: Tests were performed to determine the effects of pulp density, temperature, acid concentration, and leaching time on the sulfuric acid extraction of iron from a Pennsylvania diaspore clay.

Iron extraction increases with decreasing pulp density. This is due chiefly to the higher acid to clay ratios at lower pulp densities. The optimum concentration of sulfuric acid is 40%. More concentrated solutions of acid are not completely ionized, and consequently are less effective In Ion extraction.

The iron content of Pennsylvania aluminous clays can be appreciably lowered by means of hydrochloric acid leaching. The optimum leaching conditions are: 19% hydrochloric acid at the boiling point of the acid, 104 °C; 10% pulp density; and 10-30 minutes leaching time. The alumina losses are relatively small.

hydrochloric acid leaching apparatus

hydrochloric acid leaching function of pulp density

hydrochloric acid leaching function of temperature

 

 

 

hydrochloric acid leaching of iron from pennsylvania aluminous clays

By |2019-09-09T15:05:36-04:00August 9th, 2019|Categories: Hydrometallurgy|Tags: |Comments Off on Hydrochloric Acid Leaching of Iron from Aluminous Clays

BUY Laboratory & Small Plant Process Equipment

We have all the laboratory and plant equipment you need to test or build/operate your plant.

ENTER our Mining Equipment' Store

We Sell EQUIPMENT for all types of Mineral Treatment PROCESSES and Laboratory Testing needs

Do you need METALLURGICAL TESTING of your ORE?

View the Services we Provide

911Metallurgist Mineral Processing & Process Development Laboratory

We have a metallurgical test for every possible mineral type and treatment.

Need ENGINEERING Services or Plant TROUBLESHOOTING?

We can IMPROVE ALL PLANTS / Mineral Processing Engineering & LABORATORY Ore Testing

911Metallurgy Engineering

Contact us for process engineering, metallurgical investigations, plant optimization, plant troubleshooting, needs. WE “FIX” METALLURGY.

I Need Consulting Engineering Help
I Need Ore Laboratory Testing