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Method of preparing magnesium hydroxide and calcium carbonate and separating out phosphorus ores by taking phosphate tailings as raw materials through ammonia circulation process

A technology of magnesium hydroxide and phosphorus tailings, which is applied in the processing of magnesium hydroxide, calcium carbonate/strontium/barium, phosphate materials, etc., can solve the problems of waste of resources, low utilization value, and low content of P2O5.

Inactive Publication Date: 2015-03-25
QIANNAN NORMAL UNIV FOR NATTIES
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  • Abstract
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Problems solved by technology

[0003] Because the content of P2O5 in phosphorus tailings is low, the content of harmful impurities such as magnesium and calcium is high, and the utilization value is very low. Phosphorus tailings that have not been effectively treated for a long time have piled up like mountains, causing serious pollution to the environment, and are a waste of resources. kind of waste

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  • Method of preparing magnesium hydroxide and calcium carbonate and separating out phosphorus ores by taking phosphate tailings as raw materials through ammonia circulation process

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Embodiment 1

[0010] Example 1: Take 100 grams of phosphorus tailings, calcined at 1000°C for 1.5 hours, add 500ml of water to digest, then add 90g of ammonium chloride, heat to boiling, after ammonia distillation is complete, wait for cold filtration to obtain filter residue which is phosphorus concentrate. Add 20 g of ammonium carbonate to 400 ml of the filtrate, precipitate and filter to obtain 25 g of calcium carbonate, then add ammonia water to the filtrate, filter after precipitation to obtain 10 g of magnesium hydroxide, and continue to recycle the mother liquor.

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Abstract

The invention provides a method of preparing magnesium hydroxide and calcium carbonate and separating out phosphorus ores by taking phosphate tailings as raw materials through an ammonia circulation process. The method can be used for preparing three products, namely magnesium hydroxide, calcium carbonate and phosphorus ores by sufficiently utilizing residual tailings after raw phosphorus ore separating through circulation of ammonia. The method has the characteristics of low cost, simple process and good product quality, and is used for providing an effective utilization way for utilizing the industrial waste phosphate tailings.

Description

Technical field [0001] The invention belongs to the field of chemical industry and relates to a method for effectively separating calcium, magnesium and phosphorus elements in waste phosphorus tailings and producing products such as magnesium hydroxide and calcium carbonate. Background technique [0002] Phosphorus tailings is a kind of industrial waste discharged after flotation of raw phosphate ore, that is, waste residue. As the mining volume of phosphate rock increases, the amount of tailings also increases surprisingly (for example, 200,000 to 300,000 tons of phosphate tailings are produced for every 700,000 tons of raw ore after selection). [0003] Because the content of P2O5 in phosphorus tailings is low, the content of harmful impurities such as magnesium and calcium is high, and the utilization value is very low. Phosphorus tailings that have not been effectively treated for a long time have piled up like mountains, causing serious pollution to the environment, and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F5/14C01F11/18B09B3/00
CPCC01B25/01C01F5/20C01F11/18
Inventor 周骏宏游皇文王兴艳徐跃鑫程厚能
Owner QIANNAN NORMAL UNIV FOR NATTIES
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