Flotation technology for removing sesquioxides and magnesium impurities in silicon-calcium collophanite

Abstract

The invention discloses a flotation technology for removing sesquioxides and magnesium impurities in silicon-calcium collophanite. The flotation technology comprises following steps: (1) grinding andmilling silicon-calcium collophanite, adding water to obtain slurry, and introducing the slurry into a positive-negative floatation system; (2) crude positive floatation: adding sodium carbonate takenas a pH adjuster and sodium silicate taken as a phosphate inhibitor, then adding a positive floatation collector, carrying out pneumatic floatation, and taking materials left in the floatation grooveas rougher tailings of positive floatation to obtain a rougher foam product; (3) refining and scavenging of positive floatation: adding sodium silicate into the rougher foam product, carrying out twice refining of positive floatation to obtain a refining foam product, mixing tailings of twice refining, blending, and carrying out positive pneumatic floatation and scavenging; and (4) negative floatation: adding an inhibitor (WFS) into the refining foam product, adjusting the pH value, then adding a collector (WF-01), and carrying out negative floatation to remove magnesium. The technology has the advantages that the amount of added medicaments is low and heating is not needed, and is suitable for removing impurities in middle-low quality silicon-calcium collophanite and extracting phosphorus.

Description

technical field [0001] The invention belongs to the technical field of phosphate rock flotation, and in particular relates to a process for removing sesquioxide and magnesium impurities in siliceous-calcareous colloidal phosphate rock by flotation. Background technique [0002] Phosphate rock is a complex natural substance. The chemical composition and performance of phosphate rock vary greatly depending on the origin and deposit, which directly affects the technical indicators and economic benefits of phosphoric acid and phosphate production. In my country's entire phosphate rock reserves, low- and medium-grade collophosite accounts for 80%, which is the main body of my country's phosphate rock, especially silicon-calcium collophosphate rock. Its harmful impurities MgO, SiO 2 and sesquioxides (R 2 o 3 ) content is high, most of the apatite in the ore is colloidal, and it is cemented with dolomite, clay minerals, etc., and the symbiotic relationship is complicated, which w...

AI Technical Summary

Problems solved by technology

[0004] At present, the removal of calcium and magnesium impurities such as carbonate by traditional single reverse flotation has been difficult to meet the requirements of phosphorus concentrate in downstream acid and fertilizer production. It is necessary to develop a suitable and practical beneficiation method to efficiently remove silicon, aluminum, iron, Magnesium and other harmful impurities

In the process of phosphorus extraction and impurity removal by phosphate rock flotation, positive flotation phosphorus extraction and impurity removal is relatively mature and some have been industrialized, but the traditional forward flotation process is relatively complicated, with many types of collectors, many foams and large dosage. The final phosphorous concentrate is difficult to settle, the follow-up operation is difficult to handle, and when the ambient temperature is low, heating flotation is required, and the cost of beneficiation increases, which restricts its development.

The reverse flotation phosphorus extraction and impurity removal process is simple, the dosage of chemicals is low, and it conforms to the principle of "floating less and suppressing more". It has low temperature requirements and the concentrate is easy to follow-up. In terms of separation, the application of impurities such as desiliconization and aluminum often requires raw ore desliming pretreatment or process desliming, and the cost of chemical consumption is high and the foam effect is poor.

In addition, domestic exploration, research and application of combined processes such as positive and negative flotation, double-reverse flotation, magnetic flotation, and re-election are also involved, but there are also shortcomings such as large dosage of chemicals, large loss of phosphorus, and high investment costs. Few

For example, CN 104907183A discloses a kind of silicon-calcium low-grade colloidal phosphate rock positive and negative flotation process, with the amide-containing fatty acid soap collector as the positive flotation collector, and the amphoteric collector as the reverse flotation collector , using a closed-circuit process of one positive, one negative, one sweeping and returning to the middle mine. Although the process is simple, the amount of collectors and inhibitors is large, and the cost of chemicals is high; in addition, a phosphate mine in Sichuan has only announced two In this embodiment, the process is not involved in the application of phosphate rock in other areas, and the results of the removal of sesquioxide and magnesium oxide in phosphate concentrate products are not given; CN102179308A discloses a method for removing iron, The beneficiation method of aluminum sesquioxide is based on the forward and reverse flotation process + reverse flotation to remove R 2 o 3 The combined process of the forward and reverse flotation collectors uses conventional fatty acids, and uses isomerized mixed fatty amines and synergist mixed alcohols as sesquioxide collectors, aiming at sesquioxide removal of phosphate rocks in different mining areas in Yunnan In addition to the good results in practical application, it does not involve the practical application of other types of silici-calcium phosphate rocks in non-Yunnan provinces. The universality has not been fully reflected, and the amount of pH regulator used in the direct and reverse flotation process is relatively large. Medicament cost is high; CN206325688U and CN 106179731A respectively announced the system of flotation-magnetic separation coupling to remove sesquioxide and magnesia in collophosite and high gradient magnetic separation-single reverse flotation coupling to remove sesquioxide in phosphate rock The introduction of magnetic separation will inevitably increase the investment cost of equipment to a certain extent, and this combined process is only suitable for phosphate rock with a sesquioxide content below 4, and does not involve the application of high sesquioxide collophosite Example, Narrow Universal Applicability

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