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Method for producing light-weight magnesium carbonate by using phosphate tailings with high magnesium content

A technology of light magnesium carbonate and high magnesium phosphorus tailings, applied in magnesium carbonate, products, reagents, etc., can solve the problems of polluting the surrounding environment, waste of magnesium resources, and few utilization methods, and achieves high recovery rate of magnesium and resource saving. , The effect of good product quality

Inactive Publication Date: 2012-09-05
WENGFU (GRP) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For a long time, because the tailings have low phosphorous content and few ways to use them, they are usually treated as waste by enterprises in the way of stockpiling, which not only wastes the magnesium resources in the tailings, but also occupies land and pollutes the surrounding environment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Chemical composition of high magnesium phosphorus tailings: P 2 o 5 7.04%, MgO16.86%, CaO37.48%

[0021] Weigh 100 g of magnesium and phosphorus tailings and calcinate at 980° C. to obtain 61.4 g of calcined white. Calcined white and 700g of water were stirred at 80°C for 40 minutes to obtain a digestive juice. Supplement 800g of water into the digestive juice, and then pass gas with a volume fraction of 35% carbon dioxide into the digestive juice to carry out carbonization reaction at 20°C to obtain carbonized liquid, stop the reaction when the pH value of the carbonized liquid drops to 6.7, and filter the carbonized liquid , the filtrate is heavy magnesium water. The heavy magnesium water was pyrolyzed at 95° C. for 0.5 h to obtain precipitates of light magnesium carbonate. After filtration, a filter cake of light magnesium carbonate was obtained. The filter cake was baked at 150° C. for 3 hours to obtain a product of light magnesium carbonate.

Embodiment 2

[0023] Chemical composition of high magnesium phosphorus tailings: P 2 o 5 6.00%, MgO18.25%, CaO36.82%

[0024] Weigh 100 g of magnesium and phosphorus tailings and calcinate at 950° C. to obtain 59.8 g of calcined white, and stir the calcined white and 500 g of water at 80° C. for 30 minutes to obtain digestive juice. Add 600g of water to the digestive juice, and then pass gas with 30% carbon dioxide volume fraction into the digestive juice to carry out carbonization reaction at 25°C to obtain carbonized liquid, stop the reaction when the pH value of the carbonized liquid drops to 6.9, and filter the carbonized liquid , the filtrate is heavy magnesium water. The heavy magnesium water was pyrolyzed at 93° C. for 0.8 h to obtain precipitates of light magnesium carbonate. After filtration, a filter cake of light magnesium carbonate was obtained. The filter cake was baked at 180° C. for 2 hours to obtain a product of light magnesium carbonate.

Embodiment 3

[0026] Chemical composition of high magnesium phosphorus tailings: P 2 o 5 6.35%, MgO18.59%, CaO37.01%

[0027] Weigh 100g of magnesium and phosphorus tailings and calcinate at 960°C to obtain 60.5g of calcined white, and stir the calcined white and 430g of water at 85°C for 30 minutes to obtain a digestive solution. Supplement 900g of water into the digestive juice, and then pass gas with a volume fraction of 27% carbon dioxide into the digestive juice to carry out carbonization reaction at 30°C to obtain carbonized liquid, stop the reaction when the pH value of the carbonized liquid drops to 6.8, and filter the carbonized liquid , the filtrate is heavy magnesium water. The heavy magnesium water was pyrolyzed at 97° C. for 0.5 h to obtain precipitates of light magnesium carbonate. After filtration, a filter cake of light magnesium carbonate was obtained. The filter cake was baked at 120° C. for 4 hours to obtain a product of light magnesium carbonate.

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Abstract

The invention discloses a method for producing light-weight magnesium carbonate by using phosphate tailings with high magnesium content. The method comprises the following steps of: calcining the phosphate tailings with high magnesium content into calcined dolomite at a high temperature; mixing the calcined dolomite and water according to a certain proportion to obtain a slaking solution; supplementing water of a certain proportion into the slaking solution, feeding gas with carbon dioxide into the solution, and performing carbonization reaction to obtain a carbonized solution; after the reaction is finished, filtering the carbonized solution to obtain filtrate, namely a magnesium potassium chromate solution; performing pyrolysis on the magnesium potassium chromate solution, thus obtaining magnesium carbonate sediments; and filtering and drying the sediments to obtain the light-weight magnesium carbonate product. By using the method, waste is turned into treasure, so that magnesium resources in the phosphate tailings with high magnesium content are recycled; the process is simple and low in cost; and the economic and environmental benefits are remarkable.

Description

technical field [0001] The invention relates to the technical field of chemical industry, in particular to a method for producing light magnesium carbonate by using waste high-magnesium phosphorus tailings. Background technique [0002] Since most of the phosphate rocks in our country are medium and low-grade phosphate rocks, it is generally necessary to go through chemical flotation beneficiation and enrichment into commercial phosphate concentrates. High-magnesium phosphorous tailings are the by-products of phosphorous concentrate obtained from phosphate rock through flotation enrichment, and its P 2 o 5 The content is 3% to 8.5%, and the MgO content is 15% to 21%, which belongs to high magnesium and low grade phosphate rock. For a concentrator with an annual output of 3 million tons of phosphorus concentrate, about 1 million tons of high-magnesium phosphorus tailings are produced each year, containing about 180,000 tons of MgO. For a long time, because the tailings hav...

Claims

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Application Information

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IPC IPC(8): C01F5/24
CPCY02P20/141
Inventor 何浩明杨三可刘旭胡厚美胡宏李艳龙庆兰
Owner WENGFU (GRP) CO LTD
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