Iso-floatable separation process of siliceous-calcareous collophanite

Abstract

The invention relates to an iso-floatable separation process of siliceous-calcareous collophanite, comprising the following steps of: crushing and grinding siliceous-calcareous-based collophanite ores, adding water, mixing size, and then entering iso-floatable operation for the iso-floatable flotation of the siliceous-calcareous-based collophanite ores; enabling flotation froths to flow into a reverse flotation agitating tank, mixing the size, and then entering a reverse flotation system for the reverse flotation of carbonate gangue minerals, wherein products inside a reverse flotation tank are reverse flotation phosphate concentrates; and enabling the products inside an iso-floatable flotation tank to enter a direct flotation agitating tank and materials obtained after size mixing to enter a direct flotation system for direct flotation, wherein direct flotation froth products are direct flotation phosphate concentrates. The iso-floatable separation process sufficiently utilizes the difference of natural floatability of ores and has the advantages of small using amount of flotation reagent, circulation utilization of beneficiation wastewater, high separation efficiency and excellent process index; the obtained phosphate concentrates contain lower MgO content and high concentrate quality; and final product phosphate concentrates are lower in comprehensive cost.

Description

technical field [0001] The invention relates to a phosphate ore beneficiation process, in particular to a flotation separation process suitable for sedimentary siliceous-calcium colloidal phosphate rock with a medium-grade MgO content between 1.0% and 3.5%. Background technique [0002] Sedimentary phosphorite ore (the phosphorus-containing mineral is collophoste) is the most important phosphate rock in the world's phosphate rock resources, accounting for more than 70% of the world's total phosphate rock reserves, of which the largest reserves and the most difficult to select are medium and low grades Silica collophosite. For this kind of ore, the carbonate and silicate impurities must be excluded at the same time in the beneficiation process, so as to meet the requirements of phosphate fertilizer processing. At present, the more mature beneficiation process for this type of ore is positive and negative flotation. The essence of the positive and negative flotation process i...

AI Technical Summary

Problems solved by technology

However, there are obvious deficiencies in the conventional forward and reverse flotation process: ①The amount of foam in forward flotation is large, which is easy to cause "mechanical inclusions". If the amount is large, the flotation process is difficult to control and stabilize, and it is easy to cause foam "mechanical inclusion" and transportation difficulties, reducing the selectivity of the flotation process; 4kg / t or more, and the corresponding acid consumption is also large, because the reverse flotation needs to be carried out in a weakly acidic medium, while the forward flotation is carried out in an alkaline medium, and the pulp is adjusted from alkaline (pH 9-10) to Weak acidity (pH 5-6) needs to consume more acid; ③ It is difficult to use the return water, because all the positive flotation foam enters the reverse flotation system for reverse flotation to reduce magnesium, resulting in too much acidic water, which cannot be directly returned to positive flotation The utilization of the beneficiation system makes it difficult to recycle the beneficiation wastewater; ④The cost of beneficiation is high, due to factors such as the large amount of chemicals used and the beneficiation wastewater must be treated before it can be recycled, resulting in high beneficiation costs

It is precisely because of the above-mentioned technical and economic problems that the industrialization of the colloidal positive and negative flotation process is restricted.

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