Gravity separation-flotation combined beneficiation process for phosphate ores,Method for preparing calcium hydrophosphate through double-acidolysis of phosphorite

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Phosphorite, phosphate rock or rock phosphate is a non-detrital sedimentary rock which contains high amounts of phosphate minerals. The phosphate content of phosphorite (or grade of phosphate rock) varies greatly, from 4% to 20% phosphorus pentoxide (P₂O₅). Marketed phosphate rock is enriched ("beneficiated") to at least 28%, often more than 30% P₂O₅. This occurs through washing, screening, de-liming, magnetic separation or flotation. By comparison, the average phosphorus content of sedimentary rocks is less than 0.2%. The phosphate is present as fluorapatite Ca₅(PO₄)₃F typically in cryptocrystalline masses (grain sizes < 1 μm) referred to as collophane-sedimentary apatite deposits of uncertain origin. It is also present as hydroxyapatite Ca₅(PO₄)₃OH or Ca₁₀(PO₄)₆(OH)₂, which is often dissolved from vertebrate bones and teeth, whereas fluorapatite can originate from hydrothermal veins. Other sources also include chemically dissolved phosphate minerals from igneous and metamorphic rocks. Phosphorite deposits often occur in extensive layers, which cumulatively cover tens of thousands of square kilometres of the Earth's crust.

Gravity separation-flotation combined beneficiation process for phosphate ores

PendingCN110369120AReduce grinding costsReduce adverse effectsFlotationWet separationPhosphoriteReverse flotation

The invention relates to a gravity separation-flotation combined beneficiation process for phosphate ores. The gravity separation-flotation combined beneficiation process for phosphate ores comprisesthe following steps: feeding phosphate ore pulp into a three-segment spiral chute gravity separation process to obtain reselected concentrate and reselected tailings; feeding the reselected concentrate into a desilicication reverse flotation process to obtain desilicicated concentrate and desilicicated tailings; feeding the desilicicated concentrate into a magnesium removal reverse flotation process to obtain double reverse concentrate and magnesium removal tailings; feeding the reselected tailings into a thickener to be concentrated to obtain a thick bottom flow; feeding the thick bottom flowinto a direct flotation process to obtain direct flotation concentrate and direct flotation tailings; feeding the direct flotation concentrate into a reverse flotation process to obtain direct and reverse concentrate and reverse flotation tailings; combining the desilicicated tailings, the direct flotation tailings and the reverse flotation tailings to obtain final phosphate tailings; and combining the double reverse concentrate with the direct and reverse concentrate to obtain the final phosphate concentrate. The process has the advantages that the desilicication reverse flotation is free ofslurry interference, the silicate removal efficiency is high, direct flotation is free of coarse grain level interference, the consumption of a reagent is low, the yield of a foamed product floatingin the beneficiation process is low, and a flowage structure is good in stability and high in controllability.

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Owner:HUBEI XINGFA CHEM GRP CO LTD

Method for preparing calcium hydrophosphate through double-acidolysis of phosphorite

ActiveCN106044732ALess quantityHigh extraction rateCalcium/strontium/barium sulfatesPhosphorus compoundsSulfatePhosphorite

The invention discloses a method for preparing calcium hydrophosphate through double-acidolysis of phosphorite. The method is characterized by comprising the following steps of ore pulp preparation, conduction of a hydrochloric acid acidolysis reaction, conduction of a sulfuric acid acidolysis reaction, first-segment neutralization, second-segment neutralization, third-segment neutralization, hydrochloric acid regeneration and calcium sulfate precipitation. The method has the advantages that ores are subjected to acidolysis more fully through two steps of acidolysis reactions, and food-grade calcium sulfate is generated when hydrochloric acid is regenerated.

Owner:LUFENG TIANBAO PHOSPHORUS CHEM CO LTD

2 results about "Phosphorite" patented technology

Gravity separation-flotation combined beneficiation process for phosphate ores

Method for preparing calcium hydrophosphate through double-acidolysis of phosphorite

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