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Method for recovering ammonium chloride from magnesium carbonatization waste liquid

A carbonation waste liquid and carbonation technology, applied in the direction of ammonium chloride, ammonium halide, etc., can solve the problems of waste of raw materials, environmental pollution, increased production costs, etc., to reduce energy consumption, reduce costs, improve The effect of utilization

Inactive Publication Date: 2019-01-15
南京浦世环境科技发展有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In the process of sequestering carbon dioxide to produce light magnesium carbonate, and the brine ammonium bicarbonate method to produce magnesium carbonate and other magnesium carbonates, a large amount of magnesium carbonated waste liquid will be produced, and these waste liquids contain a large amount of NH 4 + , Cl - If the waste liquid is discharged directly without treatment, it will not only cause waste of raw materials, increase production costs, but also cause serious environmental pollution

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  • Method for recovering ammonium chloride from magnesium carbonatization waste liquid

Examples

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Effect test

Embodiment 1

[0025] Such as figure 1 , A method for recovering ammonium chloride from magnesium carbonate waste liquid, including the following steps:

[0026] (1) Pump 500L of magnesium carbonate waste liquid with ammonium chloride concentration of 5.8mol / L into the ammonium chloride crystallization kettle, and the pump flow rate of the waste liquid is 20m 3 / h, stirring (150r / min) and adding concentrated hydrochloric acid to adjust pH 6;

[0027] (2) Transport 300kg of magnesium-rich mineral raw materials to the ammonium chloride crystallization kettle through the transport pipe chain for crystallization, the crystallization temperature is 50°C, and after the crystallization is completed, a suspension is obtained;

[0028] (3) Pass the suspension into a centrifuge for centrifugation (speed of 3000r / min, time of 20min) to obtain a solid product and a clear solution containing 2mol / L magnesium chloride, and send the clear solution to a magnesium-rich mineral concentration tank. To seal carbon di...

Embodiment 2

[0030] A method for recovering ammonium chloride from magnesium carbonate waste liquid, including the following steps:

[0031] (1) Pump 1000L of magnesium carbonate waste liquid with an ammonium chloride concentration of 5.8mol / L into the ammonium chloride crystallization kettle, and the pump flow rate of the waste liquid is 20m 3 / h, stir (150r / min) and add concentrated hydrochloric acid to adjust pH7;

[0032] (2) Transport 800kg of magnesium-rich mineral raw materials to the ammonium chloride crystallization kettle through the transport pipe chain for crystallization, the crystallization temperature is 50°C, and after the crystallization is completed, a suspension is obtained;

[0033] (3) Pass the suspension into a centrifuge for centrifugation (speed of 3000r / min, time of 20min) to obtain a solid product and a clear solution containing 2mol / L magnesium chloride, and send the clear solution to a magnesium-rich mineral concentration tank. To seal carbon dioxide; send the solid pr...

Embodiment 3

[0035] A method for recovering ammonium chloride from magnesium carbonate waste liquid, including the following steps:

[0036] (1) Pump 1500L of magnesium carbonate waste liquid with an ammonium chloride concentration of 5.8mol / L into the ammonium chloride crystallization kettle, and the pump flow rate of the waste liquid is 20m 3 / h, stir (200r / min) and add concentrated hydrochloric acid to adjust the pH to 7;

[0037] (2) Transport 1500kg of magnesium-rich mineral raw materials to the ammonium chloride crystallization kettle through the transport pipe chain for crystallization, the crystallization temperature is 50°C, and after the crystallization is completed, a suspension is obtained;

[0038] (3) Pass the suspension into a centrifuge for centrifugation (speed of 3000r / min, time of 30min) to obtain a solid product and a clear liquid containing 2mol / L magnesium chloride, and send the clear liquid to a magnesium-rich mineral concentration tank for use To seal the carbon dioxide; s...

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Abstract

The invention relates to a method for recovering ammonium chloride from magnesium carbonatization waste liquid. The method comprises the steps that the magnesium carbonatization waste liquid is pumpedinto an ammonium chloride crystallization kettle, stirring is carried out, concentrated hydrochloric acid is added to adjust the pH value to 2-7, magnesium-rich raw mineral materials are conveyed into the ammonium chloride crystallization kettle through a conveying pipe chain, crystallization is carried out, and turbid liquid is obtained after crystallization is finished; the turbid liquid is introduced into a centrifuge to be centrifuged so as to obtain a solid product and clear liquid containing magnesium chloride, and the clear liquid is fed into a magnesium-rich mineral concentration tankfor sealing and storing carbon dioxide; and the solid product is fed to a drying machine to be dried so as to obtain the ammonium chloride. According to the method, the magnesium carbonatization waste liquid is reused, so that the utilization rate of ammonia is increased, the magnesium carbonatization cost is lowered, meanwhile, an existing ammonium chloride production technology is improved, sothat the energy consumption is reduced, and the produced ammonium chloride is high in yield and high in purity and can be continuously produced; and environmental pollution cannot be caused in the processes of treating the magnesium carbonatization waste liquid and recycling the ammonium chloride in the method, and the whole process route is energy-saving and environmentally friendly.

Description

Technical field [0001] The invention relates to a method for recovering ammonium chloride from magnesium carbonate waste liquid, and belongs to the technical field of chemical industry and environmental protection. Background technique [0002] Ammonium chloride is not only a widely used quick-acting nitrogen fertilizer, but also used in medicine, electroplating, casting and other industries. The current processes for producing or recovering ammonium chloride include evaporation crystallization, cooling crystallization (cold precipitation), recrystallization, water washing, etc., among which cooling crystallization is the most common method. The evaporative crystallization method needs to consume a large amount of steam to continuously heat the material, which has high energy consumption and is highly corrosive to the equipment; the cold analysis method needs to reduce the temperature to the range of nearly 0℃, and some processes even need to control the temperature at -7.5℃ for ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01C1/16
CPCC01C1/164C01P2006/80
Inventor 赵良张猛龙朱辰王晗
Owner 南京浦世环境科技发展有限公司
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