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Method for processing phosphate rock tailings and producing magnesium-containing calcium carbonate

A technology of phosphorus tailings and calcium carbonate, which is applied to the treatment of calcium carbonate/strontium/barium, magnesium carbonate, phosphate materials, etc., to achieve the effect of increasing added value

Active Publication Date: 2016-03-16
贵州盛源新材料股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there is no literature report on the method of using nitric acid and ammonium nitrate combined leaching to improve the quality of phosphate rock tailings and produce magnesium-containing calcium carbonate. This provides a new idea for the processing of tailings and increasing the added value of products.

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  • Method for processing phosphate rock tailings and producing magnesium-containing calcium carbonate

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Embodiment 1

[0065] A method for processing phosphate rock tailings and producing magnesium-containing calcium carbonate, comprising the following steps:

[0066] (1) Calcination and digestion: the phosphorus tailings are placed in a calciner, calcined at a temperature of 950°C for 60 minutes, and then subjected to water digestion; the water digestion is carried out with 85°C hot water, and the amount of water is 100g of phosphorus tailings use 100ml of water;

[0067] (2) Composite leaching: place the digested phosphorus tailings in a leaching tank, then add a 30% ammonium nitrate solution and a 60% nitric acid solution, and stir for 60 minutes at a temperature of 85°C; ammonium nitrate The dosage is to add 300g per 100g of phosphorous tailings, and the amount of nitric acid solution is to add 20g per 100g of phosphorous tailings;

[0068] (3) Separation: filter and wash the slurry after the leaching treatment in step 2 to obtain leach residue and leach solution; dry the filter residue a...

Embodiment 2

[0073] A method for processing phosphate rock tailings and producing magnesium-containing calcium carbonate, comprising the following steps:

[0074] (1) Calcination and digestion: the phosphorus tailings are placed in a calciner, calcined at a temperature of 900°C for 75 minutes, and then subjected to water digestion; the water digestion is carried out with 60°C hot water, and the amount of water is 110ml of water is used for 100g of phosphorus tailings;

[0075] (2) Composite leaching: place the digested phosphorus tailings in a leaching tank, then add a 10% ammonium nitrate solution and a 50% nitric acid solution, and stir for 70 minutes at a temperature of 80°C; ammonium nitrate The dosage is to add 250g per 100g of phosphorous tailings, and the amount of nitric acid solution is to add 18g per 100g of phosphorous tailings;

[0076] (3) Separation: filter and wash the slurry after the leaching treatment in step 2 to obtain leach residue and leach solution; dry the filter r...

Embodiment 3

[0081] A method for processing phosphate rock tailings and producing magnesium-containing calcium carbonate, comprising the following steps:

[0082] (1) Calcination and digestion: the phosphorus tailings are placed in a calciner, calcined at a temperature of 1100°C for 45 minutes, and then subjected to water digestion; the water digestion is carried out with 100°C hot water, and the amount of water is 100g phosphorous tailings use 90ml water;

[0083](2) Composite leaching: place the digested phosphorus tailings in a leaching tank, then add 50% ammonium nitrate solution and 80% nitric acid solution, and stir for 50 minutes at a temperature of 85°C; ammonium nitrate The dosage is to add 350g per 100g of phosphorous tailings, and the amount of nitric acid solution is to add 22g per 100g of phosphorous tailings;

[0084] (3) Separation: filter and wash the slurry after the leaching treatment in step 2 to obtain leach residue and leach solution; dry the filter residue at 110° C....

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Abstract

The invention relates to the technical field of phosphate rock tailing processing and treatment, in particular to a method for processing phosphate rock tailings and producing magnesium-containing calcium carbonate. First the calcium-magnesium carbonate decomposition process is accelerated through calcination digestion treatment, magnesium element is fully extracted by combination with compound extraction of ammonium nitrate solution and nitric acid solution and compound extraction of ammonium chloride solution and hydrochloric acid solution, the magnesium element is separated out of the phosphate rock tailings massively, and the quality of recycled phosphate rock is improved. Waste liquid and waste gas which are generated in the process are recycled, a treated solvent is reused, magnesium-containing calcium carbonate is prepared while the high-quality phosphate rock is obtained, not only are calcium and magnesium elements effectively reused, but also the discharge of the waste liquid and the waste gas and the accumulation of the tailings are avoided, and the method is favorable for ecological environment improvement.

Description

technical field [0001] The invention relates to the technical field of phosphorus tailings treatment, in particular to a method for processing phosphorus tailings and producing magnesium-containing calcium carbonate. Background technique [0002] my country's phosphate rock reserves rank second in the world, but about 80% of the reserves are medium and low-grade phosphate rocks, most of which are difficult-to-select middle and low-grade collophosphine, with fine mineral particles and tightly embedded distribution, and relatively high impurities such as associated magnesium. High, it will reduce the grade of phosphate ore, increase the consumption of sulfuric acid during wet treatment of phosphate ore, and affect the quality of phosphoric acid and phosphate deep processing and products. Therefore, pretreatment of phosphate rock is required. At present, the beneficiation of phosphate rock in my country mainly adopts flotation, reverse flotation and other methods, in which the t...

Claims

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Application Information

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IPC IPC(8): C01B25/01C01F11/18C01F5/24
Inventor 顾春光张钦张富强文焱炳卢玉莲张澜曦韩瑜张仁秀
Owner 贵州盛源新材料股份有限公司
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