Method for alkali leaching dephosphorization of phosphorus-containing iron ore

A technology for iron ore alkali and iron ore, which is applied to phosphorus by-products, realizes the recycling of alkali liquor, can solve the problems affecting the low cost and high value utilization of phosphorus-containing iron ore, and achieves the effect of high iron recovery rate.

Inactive Publication Date: 2018-08-10
BEIJING MINING & METALLURGICAL TECH GRP CO LTD
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  • Abstract
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Problems solved by technology

[0011] The existing technology for phosphorus-containing iron ore dephosphorization still has some shortcomings in terms of phosphorus removal rate, dephosphori

Method used

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  • Method for alkali leaching dephosphorization of phosphorus-containing iron ore

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Embodiment 1

[0037] Mix the iron concentrate with 100g / L NaOH solution for leaching, the leaching liquid-solid ratio is 5:1, the temperature is 90°C, and the time is 2h. After solid-liquid separation, the leaching rate of aluminum is 85%, and the leaching rate of phosphorus is 80%.

Embodiment 2

[0039] Mix the iron concentrate with 200g / L NaOH solution for leaching, the leaching liquid-solid ratio is 6:1, the temperature is 95°C, and the time is 3h. After solid-liquid separation, the leaching rate of aluminum is 92% and the leaching rate of phosphorus is 85%.

Embodiment 3

[0041] Mix the iron concentrate with 100g / L NaOH solution for leaching, the leaching liquid-solid ratio is 8:1, the temperature is 50°C, and the time is 2h. After solid-liquid separation, the aluminum leaching rate is 72% and the phosphorus leaching rate is 70%.

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Abstract

The invention discloses a method for alkali leaching dephosphorization of phosphorus-containing iron ore, and belongs to the technical field of the dephosphorization of the phosphorus-containing ironore. The method comprises the steps that the phosphorus-containing iron ore is crushed and finely ground, and the finely-ground phosphorus-containing iron ore or high-phosphorus iron ore concentrate and a certain concentration of alkali leaching solution are mixed, stirred and leached. Qualified dephosphorized iron ore or iron ore concentrate is prepared after solid-liquid separation. The leachingsolution is evaporated and then cooled to form a sodium phosphate coarse salt separated by crystallization. A dephosphorization high aluminum solution of partial of the coarse sodium phosphate is evaporated and passed into CO2, the composition content of Al2O3 and Na2O of the solution is adjusted, an aluminum hydroxide is prepared by seed precipitation, and the aluminum hydroxide is calcined to prepare an aluminum oxide. According to the method for alkali leaching dephosphorization of the phosphorus-containing iron ore, the recycling of alkali liquor can be realized while the by-product aluminum oxide and sodium phosphate products are produced, and technical support can be provided for the low cost and high value utilization of the phosphorus-containing iron ore or the high-phosphorus iron ore concentrate.

Description

technical field [0001] The invention belongs to the technical field of dephosphorization of phosphorus-containing iron ore, and relates to a method for alkali leaching dephosphorization from phosphorus-containing iron ore or high-phosphorus iron concentrate, in particular to realize recycling of lye and prepare by-products of aluminum and phosphorus. Background technique [0002] There are a large amount of phosphorus-containing iron ores on the surface of the earth's crust, among which there are large reserves of phosphorus-containing weakly magnetic iron ores in North America's Superior region, Minnesota region, Northern Europe, Australia, and Saudi Arabia. my country's high-phosphorus iron ore is mainly distributed in Yunnan, Sichuan, Hubei, Hunan, Anhui, Jiangsu and Inner Mongolia in North China in the Yangtze River Basin. The reserves of high-phosphorus iron ore are 744.5 billion tons, accounting for the national iron ore resources 14.86% of the total reserved reserves. ...

Claims

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Application Information

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IPC IPC(8): C22B1/11C22B3/12C22B21/00C01B25/30
CPCC01B25/30C22B1/11C22B3/12C22B21/0015Y02P10/20
Inventor 范艳青冯林永张登高袁朝新
Owner BEIJING MINING & METALLURGICAL TECH GRP CO LTD
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