Reverse/direct flotation technology of collophanite

Abstract

The invention discloses a reverse / direct flotation technology of collophanite. The technology comprises the following steps of: performing ore reduction, ore grinding and size mixing on the silicon calcium type collophanite; adding a carbonate gangue mineral flotation regulator and fatty-acid soap respectively to perform size mixing; performing reverse flotation on the material after the size mixing, wherein the product in the tank is reverse flotation concentrate; dehydrating the reverse flotation concentrate and adding sodium carbonate so as to adjust the pH value to 8-10; performing closed-loop ore grinding and grading on the base flow; enabling the grading overflow to enter a direct flotation stirring tank, and adding water glass and fatty acid soap into the tank respectively to perform size mixing; performing direct flotation on the material subjected to the size mixing, wherein the direct flotation foam product is direct flotation concentrate; and performing concentration, filtration and drying to obtain the finished product of phosphate concentrate. After dehydration (reagent removal), the technology disclosed by the invention can be used for remarkably reducing the amount of sodium carbonate for neutralizing acid water; the sodium carbonate has a dispersion and grinding aid function, and the over-grinding of the material of direct flotation can be reduced; and the fresh surface and proper size composition generated by the ore grinding are favorable for improving the sorted behavior of the direct flotation and improving the sorting efficiency.

Description

technical field [0001] The invention relates to a phosphate ore beneficiation process, in particular to an inverse flotation process suitable for middle and low grade sedimentary siliceous-calcium collophosite. Background technique [0002] Flotation is one of the main methods of phosphate ore beneficiation. For the medium and low-grade siliceous-calcium colloidal phosphate rock with the largest reserves and the most difficult to select among phosphate rock resources, this kind of ore must exclude carbonate and silicate impurities at the same time during the beneficiation process to meet the requirements of phosphate fertilizer processing. The floatability of carbonate and silicate impurities is very different. At present, most of the separation of this type of ore at home and abroad adopts the "two-step flotation process" for enrichment, that is, the "two-step flotation process" is used to exclude Carbonate and silicate impurities in phosphate rock. The commonly used "two...

AI Technical Summary

Problems solved by technology

Because the pulp pH regulator of floating phosphorus positive flotation is generally a weak base, it needs to neutralize a large amount of alkali from acidic reverse flotation to alkaline positive flotation, resulting in high cost of dressing reagents; in addition, collophosite itself Floatability is poor, the surface of collophosite particles is inhibited under acidic conditions, and it is difficult to restore its original buoyancy when it is adjusted to alkaline, which will directly affect the separation and index of flotation; Floating phosphorus positive flotation in the separation process generally requires a finer grinding fineness, which is suitable for the flotation of fine-grained phosphorus minerals, and the separation of coarse-grained phosphorus minerals is poor.

Because of the above-mentioned technical problems, the limitation of the application of the reverse flotation process is caused, which restricts the industrialization of the reverse flotation process of collophanite