Process for preparing light magnesium carbonate from boron mud

A light magnesium carbonate and process technology, applied in the direction of magnesium carbonate, can solve the problems that are not conducive to industrial production, high energy consumption in the pyrolysis stage, and inability to overcome limitations, so as to achieve maximum use value and promotion value, and low equipment requirements , low cost effect

Inactive Publication Date: 2014-08-13
李广凡
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this method, the magnesium bicarbonate solution pyrolysis stage consumes a lot of energy, accounting for more than 50% of the energy consumption of the whole process. The increase in energy consumption leads to rising costs, which is not conducive to industrial production.
[0008] This shows that both acid method and physical activation method have insurmountable limitations, and the technical problem of alkali carbonization method is that the pyrolysis stage consumes a lot of energy, and this area is anxious to find a kind of boron mud to prepare light magnesium carbonate technology, its Can overcome the above technical problems

Method used

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  • Process for preparing light magnesium carbonate from boron mud

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Digestion: Weigh 1kg of boron mud, 400g of calcium oxide and 3kg of water and stir evenly, the reaction temperature is 85°C, and the reaction time is 3.5 hours to obtain a digestion mixture;

[0043] Carbonization: Pour the above-mentioned digestion mixture into the carbonization tank, add 6kg of water at 10°C to the carbonization tank, and open the circulating water for external cooling to keep the carbonization temperature between 20-30°C. Carbon dioxide gas of about 0.4MPa, carbonized for 1 hour;

[0044] Purification: filter the carbonized mixture, add any alkali or any combination of alkalis mentioned above to the filtrate, the amount of alkali added is 0.015% of the weight of the boron mud, pyrolyze at 45°C for 2 hours, and then suction filter , wash and dry. Calculate the pyrolysis rate (96%) according to the magnesium bicarbonate content in the solution before and after the reaction. As determined by complexometric titration, the quality of the product conform...

Embodiment 2

[0046] Digestion: Weigh 1 kg of boron mud (magnesia content is 40%), 600 g of calcium oxide and 6 kg of water are stirred evenly, the reaction temperature is 100 ° C, and the reaction time is 2 hours to obtain a digestion mixture;

[0047] Carbonization: Pour the above-mentioned digestion mixture into the carbonization tank, add 12kg of water at 20°C to the carbonization tank, and open the circulating water for external cooling to keep the carbonization temperature between 20-30°C. Carbon dioxide gas of about 0.4MPa, carbonized for 1 hour;

[0048] Purification: filter the carbonized mixture, add any alkali or any combination of alkalis mentioned above to the filtrate, the amount of alkali added is 0.02% of the weight of the boron mud, pyrolyze at 50°C for 1 hour, and pump Filter, wash and dry. Calculate the pyrolysis rate (97%) according to the magnesium bicarbonate content in the solution before and after the reaction. As determined by complexometric titration, the quality...

Embodiment 3

[0050] Digestion: weigh 1 kg of boron mud (magnesia content is 40%), 500 g of calcium oxide and 4 kg of water and stir evenly, the reaction temperature is 95 ° C, and the reaction time is 2.5 hours to obtain a digestion mixture;

[0051] Carbonization: Pour the above-mentioned digestion mixture into the carbonization tank, add 15kg of water at 20°C to the carbonization tank, and open the circulating water for external cooling to keep the carbonization temperature between 20-30°C. Carbon dioxide gas of about 0.4MPa, carbonized for 1 hour;

[0052] Purification: filter the carbonized mixture, add any alkali or any combination of alkalis mentioned above to the filtrate, the amount of alkali added is 0.01% of the weight of the boron mud, pyrolyze at 55°C for 1 hour and then suction filter , wash and dry. Calculate the pyrolysis rate (97.5%) according to the magnesium bicarbonate content in the solution before and after the reaction. As determined by complexometric titration, the...

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Abstract

The invention discloses a process for preparing light magnesium carbonate from boron mud. The process comprises the following steps of (A), digesting: mixing boron mud, calcium oxide and water and carrying out reaction to prepare digesting slurry; (B), carbonizing: supplementing quantitative water into digesting slurry, regulating concentration of the slurry, lowering the temperature to 20 DEG C-30 DEG C, continuously ventilating carbon dioxide, stirring and reaching a carbonizing final point when pH of the liquor is 7.2; (C), pyrolyzing: filtering the carbonizing liquor to obtain filtrate and slag body, adding alkaline into the filtrate and pyrolyzing; and (D), purifying: filtering, washing and drying the pyrolyzed mixed liquor to obtain the light magnesium carbonate. In the process, the alkaline is added into the magnesium bicarbonate liquor for lowering a pyrolyzing temperature to 45 DEG C-55 DEG C which is greatly lowered in comparison with the pyrolyzing temperature of 95 DEG C-105 DEG C when alkaline is not added. The process realizes energy-saving effect, and prepares the high-purity light magnesium carbonate at the same time. The carbonized slag body is used for preparing bricks, so that zero emission is realized.

Description

technical field [0001] The invention relates to a process for preparing light magnesium carbonate from boron mud, in particular to a process for preparing light magnesium carbonate with boron mud by adopting a low-temperature pyrolysis method. Background technique [0002] Boron mud is the waste residue discharged after the production of borax by using boron magnesium (iron) ore in industry, and about 4 to 5 tons of boron mud are discharged for every ton of borax produced. At present, there are many borax production plants in our country, and a large amount of borax mud is discharged and piled up in the field every year, occupying the land and polluting the environment. The main chemical composition of boron mud is MgO and SiO 2 , and contains a certain amount of Fe 2 o 3 , B 2 o 3 and a small amount of CaO, Al 2 o 3 Wait [0003] Light magnesium carbonate is an important inorganic chemical product with a wide range of uses. It can be used as a filler and reinforcing...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F5/24
Inventor 周美珍杨琳文渊杨雪梅胡珊李广凡
Owner 李广凡
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