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Method for preparing low-sodium carnallite, sodium chloride and magnesium chloride from refined magnesium slag

A technology for refining magnesium and carnallite, applied in the direction of improving process efficiency, etc., can solve problems such as difficult implementation, large amount of waste residue, complicated process, etc., and achieve the effects of environmental friendliness, high-efficiency utilization, and reasonable process route

Inactive Publication Date: 2012-04-25
SHIZUSN KAIRUI MAGNESIUM CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The process of this method is relatively complicated, and only a part of carnallite, magnesium chloride and barium chloride is recovered. It is difficult to implement, and at the same time, a large amount of waste residue will be generated, which will cause serious pollution to the environment.

Method used

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  • Method for preparing low-sodium carnallite, sodium chloride and magnesium chloride from refined magnesium slag
  • Method for preparing low-sodium carnallite, sodium chloride and magnesium chloride from refined magnesium slag
  • Method for preparing low-sodium carnallite, sodium chloride and magnesium chloride from refined magnesium slag

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Experimental program
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Effect test

Embodiment 1

[0030] like figure 1 Shown process route, its process step is:

[0031] 1) Crushing and screening: crush the refined magnesium slag to more than 60 meshes, and screen the metal magnesium particles through winnowing;

[0032] 2) Dissolution: Add the refined magnesium slag powder after winnowing into a reaction kettle with a stirring and heating device, add water, heat, stir and mix to obtain a mixed solution of soluble salt and insoluble matter; the mass of refined magnesium slag and water The ratio is 1:2—3, the heating temperature is 135±5°C, and the stirring speed is 20 r / min; according to the condition of the material, the stirring speed can be adjusted between 20-40 r / min;

[0033] 3) Filtration: filter the mixed solution obtained in step 2) to obtain filtrate and filter residue ；

[0034] 4) Keep the temperature of the filtrate at about 80°C, and adjust the K in the filtrate with magnesium chloride solution + with Mg 2+ The molar ratio is 1:1.2;

[0035] 5) The filt...

Embodiment 2

[0040] like figure 2 Shown process route, its process step is:

[0041] A method for producing low-sodium carnallite, sodium chloride, and magnesium chloride from refined magnesium slag, the method comprising the following steps:

[0042] 1) Crushing and screening: crush the refined magnesium slag to more than 60 meshes, and screen the metal magnesium particles through winnowing;

[0043] 2) Dissolution: Add the refined magnesium slag powder after winnowing into a reaction kettle with a stirring and heating device, add water, heat, stir and mix to obtain a mixed solution of soluble salt and insoluble matter; the mass of refined magnesium slag and water The ratio is 1:2—3, the heating temperature is 135±5°C, and the stirring speed is 20r / min; according to the condition of the material, the stirring speed can be adjusted between 20-40 r / min;

[0044] 3) Filtration: filter the mixed solution obtained in step 2) to obtain filtrate and filter residue ；

[0045] 4) Keep the tem...

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Abstract

The invention relates to a chemical extraction method, in particular to a method for preparing low-sodium carnallite, sodium chloride and magnesium chloride from refined magnesium slag. The method comprises the following steps of: crushing; screening; dissolving; filtering; adjusting the molar ratio of K<+> to Mg<2+> in the filtrate; evaporating, concentrating, settling, filtering and drying the filtrate to obtain a sodium chloride crystal; cooling and crystallizing the filtrate after the sodium chloride is separated to obtain low-sodium carnallite and brine; putting the filter residue into a reaction kettle; adding a full amount of hydrochloric acid for full reaction according to the contents of magnesium oxides and alkaline matters in the filter residue; after reacting, filtering, and cooling, dehydrating and drying the filtrate to obtain anhydrous magnesium chloride; adding a full amount of hydrochloric acid for full reaction according to the contents of magnesium oxides and alkaline matters in the filter residue; and after reacting, filtering, and cooling, dehydrating and drying the filtrate to obtain anhydrous magnesium chloride. The method provided by the invention has the characteristics of reasonable process route, environmental friendliness and the like and can realize cyclic and efficient utilization of the three wastes as well as cyclic utilization of water, and the utilization ratio can reach 85%.

Description

technical field [0001] The invention relates to a chemical extraction method, in particular to a method for preparing low-sodium carnallite, sodium chloride and magnesium chloride from refined magnesium slag. Background technique [0002] At present, the annual output of domestic magnesium metal is close to 600,000 tons, and the annual discharge of metal magnesium refining slag is nearly 200,000 tons. Because the barium flux for refining magnesium is made of carnallite, NaCl, BaCl 2 It is melted under certain conditions, and the metal magnesium refining waste slag contains a large amount of MgCl 2 , KCl, BaCl 2 On the one hand, the discharge of a large amount of metal magnesium refining waste slag seriously pollutes the surrounding environment, and on the other hand, it also causes a large amount of waste of metals such as potassium and barium. [0003] At this stage, for the produced refined magnesium slag, a small part is simply screened and recovered except for the res...

Claims

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Application Information

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IPC IPC(8): C22B7/04
CPCY02P10/20
Inventor 杨志刚李莉刘居骞
Owner SHIZUSN KAIRUI MAGNESIUM CHEM
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