Method for separating potassium chloride, sodium chloride and magnesium chloride from magnesium electrolysis residues

A technology of magnesium electrolytic slag and potassium chloride, which is applied in the field of separating potassium chloride from sodium chloride and magnesium chloride, can solve the problems that carnallite cannot be directly used and is difficult to control, so as to realize recycling and reuse, and solve the problem of environment Risk, simple steps, effect

Active Publication Date: 2015-04-08
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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  • Application Information

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Problems solved by technology

[0003] The Chinese patent application with the application number 201110429551.6 discloses a method for producing low-sodium carnallite, sodium chloride, and magnesium chloride from refined magnesium slag. However, in this invention, the filtrate needs to be adjusted before preparing sodium chloride. 2+ , Mg 2+ The molar ratio has strict requirements, and it is difficult to control in the industrialization process; in addition, the produced carnallite cannot be used directly, and it needs to be separated by other steps before it can be used.

Method used

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  • Method for separating potassium chloride, sodium chloride and magnesium chloride from magnesium electrolysis residues
  • Method for separating potassium chloride, sodium chloride and magnesium chloride from magnesium electrolysis residues

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Effect test

Embodiment 1

[0050] If the magnesium content is too high, potassium magnesium carnallite will be formed during the evaporation and crystallization process, which will affect the reuse of potassium chloride and sodium chloride mixed salt; in order to reduce the magnesium content in the filtrate, a decontamination agent is added to the filtrate to detect the presence of impurities in the filtrate. Calcium, magnesium content (table 1);

[0051] Table 1 Calcium and magnesium content in filtrate after adding impurity remover

[0052] Amount of impurity remover (g / l)

[0053] Therefore, the amount of impurity remover added is 5-10g / L.

Embodiment 2

[0055] Considering production cost and equipment type selection, sodium chloride, the crystallization separation temperature of potassium chloride mixture are analyzed, and the results are shown in Table 2:

[0056]Table 2 The effect of crystallization temperature on yield and crystallization product components

[0057]

[0058] Choose around 40°C, at this time the volume of the filtrate is 5-7% of the volume of the leachate.

Embodiment 3

[0060] The concentration of hydrochloric acid added in the secondary slurry is studied, and the test results are shown in Table 3:

[0061] Table 3 Dissolution of different concentrations of hydrochloric acid

[0062] Hydrochloric acid concentration (%)

[0063] Therefore, the concentration of hydrochloric acid added in the secondary slurry is selected at 10-15%.

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Abstract

The invention belongs to the field of resource recovery and aims to provide a method for separating potassium chloride, sodium chloride and magnesium chloride from magnesium electrolysis residues. The method comprises the following steps: (a) infiltrating the magnesium electrolysis residues to obtain an infiltration liquid; (b) filtering the infiltration liquid to obtain a primary filtrate and primary slurry; (c) adding water into the primary slurry to obtain a secondary filtrate and secondary slurry, adding hydrochloric acid into the secondary slurry to obtain a tertiary filtrate and tertiary slurry, evaporating and crystallizing the tertiary filtrate to obtain magnesium chloride hexahydrate; and (d) adding an impurity removing agent into the primary filtrate, filtering the primary filtrate to obtain a quaternary filtrate and quaternary slurry, evaporating and crystallizing the quaternary filtrate to obtain a mixture of sodium chloride and potassium chloride. The method provided by the invention is simple in steps, and the obtained product can be returned to the original production process to use, and resources can be recycled.

Description

technical field [0001] The invention relates to a method for separating potassium chloride, sodium chloride and magnesium chloride from magnesium electrolytic slag, and belongs to the field of resource recovery. Background technique [0002] Currently, the molten salt chlorination method is TiCl 4 One of the two major production methods of the world's titanium industry currently uses 40% of TiCl 4 produced by this process. The process has a wide range of adaptability to raw materials, good product quality, and is equipped with an electrolytic magnesium device. During the magnesium electrolysis process, a large amount of magnesium electrolysis waste salt slag will be produced. Panzhihua Sponge Titanium Plant produces 2500 tons of electrolytic magnesium salt slag annually. The magnesium slag contains about 50% potassium chloride, 25% sodium chloride, and 17% magnesium chloride and oxide. The magnesium slag is buried in the slag yard processing method. In the situation of s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D3/04C01F5/30B09B3/00
Inventor 张景垒刘昌林黄子良阳露波黎建明查笑乐任艳丽夏建辉于秀芳
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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