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Method for treating scrapped molten salt generated in molten salt chlorination production method of TiCl4

A molten salt chlorination method, molten salt technology, applied in the direction of zirconia, process efficiency improvement, energy input, etc., can solve the problem of harmful chloride pollution to the environment, achieve considerable economic and social benefits, simple process effect

Inactive Publication Date: 2013-08-28
SHENYANG INSTITUTE OF CHEMICAL TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Chlorination of molten salt waste salt and Cl-containing - Comprehensive treatment and utilization of waste water to solve the problem of preparing TiCl by molten salt electrolysis 4 The existing waste molten salt is stored for a long time, harmful chlorides pollute the environment and contain Cl - Wastewater Treatment Problems

Method used

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  • Method for treating scrapped molten salt generated in molten salt chlorination production method of TiCl4
  • Method for treating scrapped molten salt generated in molten salt chlorination production method of TiCl4
  • Method for treating scrapped molten salt generated in molten salt chlorination production method of TiCl4

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Such as the process flow of processing waste molten salt figure 1 As shown, the waste molten salt released from the furnace is directly kept at 500-900°C for 5-120 minutes, so that the waste molten salt is divided into three layers, namely the upper layer (floating layer), the middle layer (molten salt layer) and the lower layer ( sediment layer).

[0036] The upper layer is coke mixed with a small amount of molten salt. After the upper layer is separated from the middle layer and the lower layer, it is directly returned to the molten salt chlorination furnace for reuse under high temperature conditions (accounting for 13.0-16.0% of the total weight of the molten salt), or recycled coke.

[0037] The middle layer is mainly molten salt of chloride, and its composition is mainly MgCl 2 , KCl, CaCl 2 , NaCl and manganese and iron chlorides (accounting for 70.0-74.0% of the total weight of molten salt).

[0038] The lower layer (precipitated layer) is an oxide mixed with...

Embodiment 2

[0042] Such as the process flow of processing waste molten salt figure 2 As shown, after the waste molten salt is treated by thermal insulation and stratification, the chloride composition of the molten salt layer is: MgCl 2 +KCl+CaCl 2 +NaCl accounts for 76.0-80.0%, manganese and iron chlorides account for 20.0-24.0%, add silicon-calcium alloy powder (or its combination with silicon and silicon-iron alloy powder) of 2.5-3.5% of the weight of molten salt to remove manganese and iron Chloride, then pour out the spent molten salt from the crucible and cool to room temperature. This process can recycle Mn-Fe alloy (Mn content is 45.0-70.0%), and collect SiCl through dust removal system 4 , after removing manganese and iron, the MgCl of molten salt 2 , KCl, CaCl 2 And the content of NaCl is 95.3-98.0%.

[0043] Then take 100g of cooled and broken molten salt, add 45ml-70ml of waste water containing 10000ppmCl- to make a supersaturated solution, heat it to 25-100°C to form in...

Embodiment 3

[0045] Such as the process flow of processing waste molten salt image 3 As shown, the process flow is basically the same as that of Example 2, the difference is that silicon powder (or ferrosilicon alloy powder) of 1.0-2.5% of the weight of the molten salt is first added to the middle molten salt to remove iron chloride, and the bottom of the crucible is taken out metal iron; then add 1.0-2.5% aluminum powder (or industrial waste aluminum and waste aluminum alloy powder) of molten salt weight, metal Mn can be recovered at the bottom of molten salt (Mn content is greater than 90.0%), and AlCl can be collected through the dust removal system 3 and SiCl 4 , this process removes manganese and iron chloride relatively completely, MgCl in molten salt after treatment 2 , KCl, CaCl 2 And the content of NaCl reaches 96.0-98.5%.

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Abstract

The invention discloses a method for treating scrapped molten salt generated in the molten salt chlorination production method of TiCl4. The method comprises the following steps: directly keeping the temperature of the discharged scrapped molten salt at 500-900 DEG C, standing to ensure that the molten salt is divided into three layers, namely an upper layer (floating layer), a middle layer (molten salt layer) and a lower layer (precipitate layer), and then layering, wherein the upper layer is coke mixed with a little molten salt, and can be sent back to a molten salt chlorination furnace after separation for reuse, or can be used to recycle waste coke; and after deironing and demanganizing reduction treatment, the middle layer molten salt is cooled to the room temperature and treated with water and Na2CO3, thus the molten salt can be completely recycled and be used to produce Mn-Fe alloys (or Mn), MgCO3 and CaCO3 micropowder, AlCl3, SiCl4 and Cl2, the waste heat of the scrapped molten salt can be utilized, and the wastewater containing Cl<-> can be treated. Therefore, economic benefit and social benefit can be obtained.

Description

technical field [0001] The present invention relates to the method for processing waste molten salt, particularly relates to processing molten salt chlorination method to produce TiCl 4 The method of producing waste molten salt. Chlorination of molten salt waste salt and Cl-containing - Comprehensive treatment and utilization of waste water. Background technique [0002] Metal titanium has the advantages of low density, high specific strength, anti-oxidation, anti-fatigue, and corrosion resistance. It is an excellent structural and functional material and enjoys the reputation of "all-round metal", "marine metal" and "metal of the 21st century". It is widely used in national defense, aerospace, navigation, petroleum, chemical industry, medical treatment, metallurgy and other fields. [0003] Titanium dioxide is a white inorganic pigment with the best opacity, best whiteness, brightness and non-toxic properties. It is recognized as the best white pigment in the world. It ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B34/12C01G25/02
CPCY02P10/20Y02P20/129
Inventor 曹大力张帆
Owner SHENYANG INSTITUTE OF CHEMICAL TECHNOLOGY
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