Method for removing sesquioxide in complex and refractory collophanite

Abstract

The invention discloses a method for removing sesquioxide in complex and difficult-to-separate collophanite. The method comprises the following steps: (1) blocky collophanite is crushed, and grading is performed by a wet sieve to remove a fine silt part; (2) the coarse-grained product with fine silt removed is ground until the coarse-grained product with -200 meshes accounts for 50-70%, and the concentration of ore pulp is 20-25%; (3) an acidic pH regulator is added firstly, then an anion collecting agent WF-04 is added, reverse flotation phosphorus extraction and magnesium and iron removal are conducted, the product left at the tank bottom are magnesium-removed and iron-removed rough concentrate, and the foam product is magnesium-removed and iron-removed tailings; and (4) an alkaline pH adjusting agent is added to the tank bottom, a composite cation collecting agent LH-01 is added in four batches, reverse flotation phosphorus extraction and silicon and aluminum removal are conducted, the tank bottom product is final phosphate concentrate, then each section of desiliconized aluminum foam product is mixed and subjected to size mixing for reverse flotation blank scavenging, the product in the tank is medium concentrate, and the foam product is scavenging tailings. The combined beneficiation process is simple and easy to operate, the content of sesquioxide in collophanite can be effectively reduced, and the concentrate quality and the phosphorus recovery rate are remarkably improved.

Description

technical field [0001] The invention belongs to the technical field of phosphate rock flotation, and in particular relates to a method for removing sesquioxides in complex refractory collophosphate rock. Background technique [0002] Sedimentary-type siliceous-calcium colloidal phosphate rock has many elements, cementation and embedded distribution, and the symbiotic relationship is complex. Its ore dressing, impurity removal and deep processing are recognized as a worldwide problem in the phosphorus chemical industry, especially the efficient removal of sesquioxides from colloidal phosphate rock. Whether to remove or not is directly related to the future high-quality development of phosphate compound fertilizer production enterprises. [0003] In the traditional wet acid production process, the presence of sesquioxide not only interferes with the growth of phosphogypsum crystals, causing phosphoric acid to form sludge; it also forms precipitates or is discharged with gypsum...

AI Technical Summary

Problems solved by technology

[0004] At present, the removal methods of sesquioxides in phosphate rock mainly include: forward-reverse flotation, double-reverse flotation, magnetic-flotation, heavy-flotation, etc., and for different ores, the above-mentioned processes are applicable There are large differences in performance, and each has its own advantages and disadvantages. Among them, the most researched one belongs to positive and negative flotation, but because of its complex process, large dosage of reagents and high cost (it needs to be heated to increase activity if necessary), it is easy to cause fouling of the transportation pipeline, There are many negative amplification effect factors, and it is difficult to implement industrialization

At present, the treatment of phosphate rock in the industry mostly uses reverse flotation to remove carbonate minerals or combined with physical classification to indirectly remove sesquioxides, but the quality of the concentrate is difficult to guarantee and the loss of phosphorus is relatively large.

There are few patent reports on the method of removing sesquioxides by pre-desliming combined with double reverse flotation technology

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