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A kind of method for treating molten salt chlorination waste residue by high temperature phase inversion method

A high-temperature phase inversion and molten salt chlorination technology, which is applied in the direction of titanium tetrachloride, alkali metal chloride, titanium halide, etc., can solve the problems of large amount of waste water, difficult industrial application, complex treatment and utilization process, etc., and achieve production High efficiency, the effect of solving the problem of secondary pollution

Active Publication Date: 2021-11-02
CENT SOUTH UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the treatment and utilization process of molten salt chlorination waste residue at home and abroad is complicated, the amount of waste water is large, the industrial application is difficult, and a large amount of waste salt has not been effectively recovered.

Method used

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  • A kind of method for treating molten salt chlorination waste residue by high temperature phase inversion method
  • A kind of method for treating molten salt chlorination waste residue by high temperature phase inversion method
  • A kind of method for treating molten salt chlorination waste residue by high temperature phase inversion method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] The molten salt chlorination waste slag (NaCl 33.35wt%, CaCl 2 9.24wt%, MgCl 2 15.51wt%) carry out high-temperature ceramic vacuum filtration under heat preservation, obtain unreacted residue and return in the molten salt chlorination furnace. The obtained filtrate is transported to a high-temperature reaction furnace preheated to 800°C, the temperature is raised to 1100°C, and sodium silicate (Na 2 SiO 3 ), the control addition is 30.38wt% of the molten salt chlorination waste slag treatment capacity (being 1.0 times of the total molar weight of calcium chloride and magnesium chloride in the chloride filtrate), the reaction temperature is 1100 ℃, and the reaction time is 90min. The high-temperature reaction product is subjected to high-temperature ceramic vacuum filtration to obtain a filtrate with a NaCl content of 95.8%, which is circulated into a molten salt chlorination furnace; after precipitation and slagging, it can be used as a raw material for building mate...

Embodiment 2

[0033] The molten salt chlorination waste slag (NaCl 33.35wt%, CaCl 2 9.24wt%, MgCl 2 15.51wt%) carry out high-temperature ceramic vacuum filtration under heat preservation, obtain unreacted residue and return in the molten salt chlorination furnace. The obtained filtrate is transported to a high-temperature reaction furnace preheated to 800°C, the temperature is raised to 1000°C, and sodium phosphate (Na 3 PO 4 ), the control addition is 28.59wt% of the molten salt chlorination waste residue treatment capacity (being 0.7 times of the total molar weight of calcium chloride and magnesium chloride in the chloride filtrate), the reaction temperature is 1000°C, and the reaction time is 90min. The high-temperature reaction product is subjected to high-temperature ceramic vacuum filtration to obtain a filtrate with a NaCl content of 95.1%, which is circulated into a molten salt chlorination furnace; after precipitation and slagging, it can be used as a raw material for phosphate ...

Embodiment 3

[0035] The molten salt chlorination waste slag (NaCl 38.52wt%, CaCl 2 9.12wt%, MgCl 2 14.35wt%) is carried out high-temperature ceramics centrifugal separation filtration under heat preservation, obtains the unreacted residue and returns in the molten salt chlorination furnace. The obtained filtrate is transported to a high-temperature reaction furnace preheated to 850°C, the temperature is raised to 1200°C, and sodium silicate (Na 2 SiO3 ), the control addition is 28.74wt% of the molten salt chlorination waste residue treatment capacity (being 1.0 times of the total molar weight of calcium chloride and magnesium chloride in the chloride filtrate), the reaction temperature is 1200 ℃, and the reaction time is 60min. The high-temperature reaction product is subjected to high-temperature ceramic centrifugal filtration to obtain a filtrate with a NaCl content of 96.2%, which is circulated into the molten salt chlorination furnace; after precipitation and slagging, it can be used...

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Abstract

The invention discloses a method for treating molten salt chlorination waste slag by a high-temperature phase inversion method, which comprises the following steps: (1) after the molten salt chlorination waste slag is discharged from the furnace, solid-liquid separation is carried out under heat preservation, and the unreacted residue is obtained and returned to the molten salt In the chlorination furnace; (2) the obtained filtrate is transported to the preheated high-temperature reaction furnace, the temperature is raised to the set temperature, and then additives are added to react, and calcium chloride and magnesium chloride are difficult to volatilize chloride salts to form precipitation; (3) Separating the reaction product from solid to liquid, the obtained filtrate is molten salt mainly composed of sodium chloride, which is circulated into the chlorination furnace; after sedimentation and slag removal, it can be used as raw material for building materials or raw material for phosphate fertilizer production. The method for treating molten salt chlorination waste slag by high-temperature phase inversion method of the present invention adopts pyrometallurgical method to process molten salt chlorination waste slag, combined with the current production situation, the production efficiency is higher than that of water-soluble method, and new molten salt is obtained from molten salt chlorination waste slag A simple method; it can realize the recycling of molten salt, and greatly reduce the cost of continuously replenishing new salt in the molten salt chlorination process.

Description

technical field [0001] The invention belongs to the technical field of titanium metallurgy solid waste utilization, and in particular relates to a method for treating molten salt chlorination waste slag by a high-temperature phase inversion method. Background technique [0002] Titanium is known as a strategic metal and "the third metal". The high-end products of titanium, titanium metal and chlorinated titanium dioxide, have important strategic significance for the development of the national economy and the consolidation of national security, and are an important manifestation of comprehensive national strength. At present, my country's titanium products are mainly low-end sulfuric acid-process titanium dioxide products, and the supply of high-end titanium products is seriously insufficient. In order to enhance my country's comprehensive national strength, it is necessary to accelerate the development of high-end titanium products. [0003] The production of high-end tit...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01D3/08C01G23/02C05B21/00
CPCC01D3/08C01G23/022C05B7/00C05B9/00
Inventor 陈凤郑富强王帅苗庆东郭宇峰朱福兴邱冠周杨凌志姚洪国侯晓磊
Owner CENT SOUTH UNIV