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US 12,286,357 B2Granted
Process of obtaining powdered sodium silicate from sand tailings originated from the iron ore concentration process
AssigneeVale S.A.
InventorsJordanna Chamon Vogt, Fernando Soares Lameiras
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Abstract
A process of obtaining powdered sodium silicate from sand tailings generated from iron ore processing addresses the production of raw materials used in the manufacturing of geopolymers to be employed mainly by the construction industry and in road paving. The utilization of this tailing reduces environmental impact generated by the disposal in large dams, as well as enabling addition of value to a tailing by obtaining a commercially applicable product.
Claims7
A process of obtaining powdered sodium silicate from sand tailings generated from iron ore concentration process comprising the following steps:
- a) removing the ultra-fine fraction, with grain size lower than 40 μm, present in sandy tailings generated from the iron ore concentration process;
- b) subjecting the material without ultra-fine fraction to removal of excess humidity;
- c) drying the resulting material after removal of excess humidity;
- d) adding a sodium hydroxide solution to the dried material, at a concentration of 33 to 38 mol/L, at a ratio of one part of tailing mass for two parts of solution mass;
- e) subjecting the tailing and the sodium hydroxide solution to mixing until perfect homogenization;
- f) subjecting the mixture to heat treatment at a temperature between 400° C. and 500° C. and, afterwards, cooling the obtained material;
- and
- g) storing the cooled material, as the final product, thus preventing absorption of humidity.
5 more elements
Dependencies are inferred from the claim text.