Method for utilizing carbonate type middle-low-grade phosphorite to manufacture phosphate concentrate

A carbonate-type, low-grade technology, applied in the field of phosphate rock, can solve problems such as difficulty in obtaining high-quality phosphoric acid, achieve significant economic and environmental benefits, simple process flow, and easy-to-operate reactions

Active Publication Date: 2012-10-24
WENGFU (GRP) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since most of the phosphate rocks in our country are medium and low-grade ores, these ores contain a lot of impurities, and it is difficult to obtain high-quality phosphoric acid by using the conventional dihydration process, and they need to be processed before they can be used.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Chemical composition of carbonate-type medium and low-grade phosphate rock: P 2 o 5 is 19.28%, MgO is 4.62%, and the mass ratio of the mass of carbon dioxide released by full calcination at 1180°C to the mass of phosphate rock is 0.15:1

[0024] After the phosphate rock is crushed, weigh 100g of phosphate rock and calcined at 980°C to obtain about 85.2g of calcined white, whose loss on ignition rate accounts for about 97.1% of the complete loss on ignition rate. Stir the calcined white with 500g of water at 80°C for 40 Minutes to get the digestive juice. Add 200g of water to the digestive juice, and then pass gas with a volume fraction of 25% carbon dioxide into the digestive juice to carry out carbonization reaction at 25°C to obtain carbonized liquid, and stop the reaction when the pH value of the carbonized liquid drops to 7.2. After stopping the reaction, two parts, the suspension and the sandy sediment at the bottom, were formed in the carbonization solution. The...

Embodiment 2

[0026] Chemical composition of carbonate-type medium and low-grade phosphate rock: P 2 o 5 is 10.17%, MgO is 14.73%, and the mass ratio of the mass of carbon dioxide released by full calcination at 1180°C to the mass of phosphate rock is 0.34:1

[0027] After the phosphate rock is crushed, 100g of phosphate rock is weighed and calcined at 950°C to obtain about 66.3g of calcined white, and the loss on ignition rate accounts for about 96.5% of the complete loss on ignition rate. Minutes to get the digestive juice. Add 163g of water to the digestive juice, and then pass gas with 35% carbon dioxide volume fraction into the digestive juice to carry out carbonization reaction at 20°C to obtain carbonized liquid, and stop the reaction when the pH value of the carbonized liquid drops to 6.7. After stopping the reaction, two parts, the suspension and the sandy sediment at the bottom, were formed in the carbonization solution, and the sandy sediment at the bottom was obtained after hy...

Embodiment 3

[0029] Chemical composition of carbonate-type medium and low-grade phosphate rock: P 2 o 5 is 25.77%, MgO is 2.49%, and the mass ratio of the mass of carbon dioxide released by full calcination at 1180°C to the mass of phosphate rock is 0.11:1

[0030] After the phosphate rock is crushed, weigh 100g of phosphate rock and calcined at 850°C to obtain about 89.1g of calcined white, whose loss on ignition rate accounts for about 97.7% of the complete loss on ignition rate. Stir the calcined white with 180g of water at 90°C for 10 Minutes to get the digestive juice. Add 28g of water to the digestive juice, and then pass gas with 15% carbon dioxide volume fraction into the digestive juice to carry out carbonization reaction at 35°C to obtain carbonized liquid, and stop the reaction when the pH value of the carbonized liquid drops to 8.5. After stopping the reaction, two parts, the suspension and the bottom sand-like precipitate, were formed in the carbonization solution, and the b...

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PUM

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Abstract

The invention discloses a method for utilizing carbonate type middle-low-grade phosphorite to manufacture phosphate concentrate, and the method comprises the following steps of: taking the carbonate type middle-low-grade phosphorite as a raw material; and crushing, roasting, digesting, carbonizing and separating to obtain the phosphate concentrate. The method disclosed by the invention can utilize the carbonate type middle-low-grade phosphorite to manufacture the phosphate concentrate and has the characteristics of simple process flow, easiness for operation of reaction, high phosphorus recycling rate and low content of magnesium oxide in the phosphate concentrate; and the invention provides an effective manner to utilize the carbonate-type middle-low-grade phosphorite.

Description

technical field [0001] The invention relates to phosphate rock, in particular to a process method for producing phosphate concentrate by using carbonate-type medium and low-grade phosphate rock. Background technique [0002] Phosphate rock is an important mineral resource, mainly used in the production of phosphoric acid, phosphate fertilizer and phosphate products. More than 90% of the phosphate rock grade in my country is lower than 26%, and the average grade is only 17%, which is one of the countries with the lowest average grade of phosphate rock in the world. Since most of the phosphate rocks in our country are medium and low-grade ores, these ores contain a lot of impurities, and it is difficult to obtain high-quality phosphoric acid by using the conventional dihydration process, and they need to be processed before they can be used. As my country's phosphate rock resources are continuously mined and utilized, high-grade phosphate rock resources are being exhausted. T...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/01
Inventor 何浩明刘旭胡厚美王景峰解田柳玉松
Owner WENGFU (GRP) CO LTD
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