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Chemical magnesium removal method for collophanite and free of tailings

A technology for chemical magnesium removal and collophosite, applied in the field of chemical magnesium removal, can solve the problems of high concentration energy consumption, high solubility of magnesium chloride, etc., achieve high resource utilization, avoid crystallization and separation difficulties, and solve the effect of occupying land resources

Active Publication Date: 2021-01-29
HUBEI EZHONG ECOLOGICAL ENG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the adsorption of mineral dressing agents in the phosphorus tailings, the treatment energy per unit volume is low, the solubility of magnesium chloride is super large, the concentration energy consumption is high, and Mg(H 2 PO 4 ) 2 Precipitation and other issues

Method used

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  • Chemical magnesium removal method for collophanite and free of tailings
  • Chemical magnesium removal method for collophanite and free of tailings
  • Chemical magnesium removal method for collophanite and free of tailings

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] (1) Take 100g of collophosphine powder and place it in a 500mL three-necked flask, add 50mL of water to adjust the slurry, install a stirrer, a gas outlet pipe and a dropping funnel, configure NaOH into a solution with a concentration of 30wt%, and take 46g of the solution in the absorption in the bottle. Turn on the stirrer, drop 90g of 4mol / L dilute hydrochloric acid into the three-necked flask at a rate of 5-10mL / min, continue to react for 20min, filter, and wash with water 3 times. The solid concentrate was dried at 100°C, and the obtained phosphorous concentrate weighed 69.8g. Determination of Ca in Phosphate Rock Demagnesium Filtrate 2+ Concentration, PO 4 3- Concentration and Mg 2+ concentration. Reserve the sodium carbonate solution in the absorption bottle for later use. If Ca in the demagnesizing solution 2+ Ions and SO 4 2+ When the molar ratio of ions reaches 3:2, step (4) is performed; otherwise, step (3) is performed.

[0051] (2) Keep the temper...

Embodiment 2

[0060] (1) Take 200g of collophosphine powder and place it in a 500mL three-neck flask, add 50mL of water to adjust the slurry, install a stirrer, a gas outlet pipe and a dropping funnel, and then take 92g of a 30wt% NaOH solution in the absorption bottle. Turn on the stirrer, drop 144g of 5mol / L dilute hydrochloric acid into the three-necked flask at a rate of 10-20mL / min, continue the reaction for 20min, filter, and wash with water 3 times. The solid concentrate was dried at 100°C, and the obtained phosphorous concentrate weighed 141g. Determination of Ca in filtrate 2+ Concentration, PO 4 3- Concentration and Mg 2+ concentration. Reserve the sodium carbonate solution in the absorption bottle for later use. If Ca in the demagnesizing solution 2+ Ions and SO 4 2+ When the molar ratio of ions reaches 3:2, step (4) is performed; otherwise, step (3) is performed.

[0061] (2) Keep the temperature of the solution in the absorption bottle at 25°C, turn on the stirrer and ...

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Abstract

The invention discloses a chemical magnesium removal method for collophanite and free of tailings, and belongs to the technical field of phosphorite magnesium removal. According to the method, dilutedhydrochloric acid is used for chemical magnesium removal, and phosphate concentrate, CO2 and magnesium removal liquid are obtained. The method comprises the steps: introducing CO2 into a NaOH solution to obtain a sodium carbonate solution; mixing the sodium carbonate solution with calcium sulfate for reaction to obtain a sodium sulfate solution and light calcium carbonate; adding sulfuric acid into the magnesium-removed solution to precipitate calcium sulfate to obtain calcium sulfate and a diluted hydrochloric acid solution containing phosphorus and magnesium, wherein the hydrochloric acid solution is used for preparing diluted hydrochloric acid and continuously used for removing magnesium from collophanite, and the process is repeated; when the molar concentration of calcium ions in themagnesium removal solution and the molar concentration of phosphate radicals reach 3: 2, precipitating calcium sulfate by using a sodium sulfate solution, adding ammonia water into the obtained filtrate to adjust the pH value, and precipitating to obtain a nitrogen-magnesium-phosphorus fertilizer and a phosphorus precipitation filtrate; adding a sodium carbonate solution into the phosphorus precipitation filtrate to obtain magnesium carbonate and a sodium chloride solution; and concentrating and crystallizing the sodium chloride solution to obtain sodium chloride.

Description

technical field [0001] The invention relates to the technical field of magnesium removal from phosphate rock, in particular to a chemical magnesium removal method for collophosite without tailings. Background technique [0002] Phosphate rock is a strategic resource widely used in various fields of the national economy. my country's phosphate rock is "abundant but not rich", with an average grade of only about 17%-18%. With the utilization of phosphorus resources, my country's P-containing 2 o 5 There is basically no phosphate rock with a percentage greater than 20-25%P that can be directly used. 2 o 5 phosphate rock resources. The main method of utilization is to raise the grade of phosphate rock to 28%P through flotation. 2 o 5 Above, MgO is reduced to less than 2% and then processed into phosphoric acid or phosphate by sulfuric acid decomposition. [0003] At present, for medium-grade phosphate rock (23-25%P 2 o 5 ), the flotation method used is mainly reverse fl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/01C01F11/18C01F5/24C01D3/08C05B17/00
CPCC01B25/01C01F11/181C01F5/24C01D3/08C05B17/00C01P2006/66
Inventor 潘志权陈柏范旭阳吴汉军艾新帅张华丽陈晓袁乐斌
Owner HUBEI EZHONG ECOLOGICAL ENG CO LTD
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