Method for comprehensively recovering phosphorus, iron and titanium minerals in magmatic rock type phosphorite

Abstract

The invention provides a method for comprehensively recovering phosphorus, iron and titanium minerals in magmatic rock type phosphorite. The method comprises the following steps of (1) conducting coarse crushing on raw ore of the magmatic rock type phosphorite; (2) conducting fine crushing and then screening; (3) feeding fine-crushed ore into a first-stage ball mill for coarse grinding; (4) conducting one-rough three-fine two-sweeping positive floatation on a first-stage overflow product, and using positive floatation concentrate as phosphorus concentrate; (5) conducting second-stage fine grinding on floatation tailings, and separating out a second-stage overflow product through a hydraulic cyclone; (6) conducting second-stage weak magnetic separation on the second-stage overflow product; (7) feeding all weak magnetic separation tailings obtained through second-stage weak magnetic separation into a stirring mill for superfine grinding; and (8) conducting second-stage strong magnetic separation on a third-stage overflow product. In the floatation process, a NaCO3 modifying agent is not needed. According to different dissociation particle sizes of different minerals in the ore, stage ore grinding, stepped dissociation and timely separation are conducted; and accordingly, overgrinding and argillation of the minerals are avoided, and the problems of low recovery rate, high production cost, low yield, dehydration, desliming and the like in the practical production are solved.

Description

technical field [0001] The invention belongs to the technical field of mineral processing, in particular to a method for comprehensively recovering phosphorus, iron and titanium minerals in magmatic rock type phosphate rock. Background technique [0002] Phosphate rock is an important industrial and agricultural mineral raw material, mainly distributed in Yunnan, Guizhou, Sichuan and other southern provinces and cities. With the development of the phosphate fertilizer industry, China's demand for phosphate rock is increasing; it is estimated that China's phosphate-rich rock (P 2 o 5 >30%) reserves of 1.12 billion tons, accounting for 22.5% of the total reserves, will be exhausted after 10 years of mining; most of the phosphate rocks in my country are medium and low-grade phosphate rocks, which must be enriched by ore dressing before they can be phosphated industrial use. [0003] The grade of raw phosphate ore in the south is relatively high, but most of them are collop...

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Problems solved by technology

[0004] Apatite in igneous rock type phosphate rock is produced in euhedral columnar and granular form, and its grain size is mainly coarse-grained; iron, titanium and other metal minerals are mainly medium-fine grained, with uneven grain size. Mineral embedding particle size is very fine; since the ore usually contains a certain amount of magnetite TFe grade 8~15%, most of the dressing plants (such as Hegang Baiquan Iron Mine, Hebei Baotong Mining, etc.) first select the magnet by magnetic separation Apatite is recovered by flotation after the tailings are deslimed and concentrated; due to the finer particle size of the iron embedded distribution and relatively high grindability, under the grinding conditions suitable for iron selection, the apatite in the ore has serious sludge and the concentration of tailings is low, so it must go through desliming, concentration and other processes before it can enter flotation; resulting in problems such as difficult flotation separation, small processing capacity, serious phosphorus loss, and low recovery rate; in addition, TiO exists in the ore 2 Ilmenite with a content of 2-5% has not been recovered; therefore, it is of great economic value and practical significance to develop a high-efficiency beneficiation and separation process that can comprehensively recover phosphorus, iron, and titanium minerals for this type of ore

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