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Treatment method of fused salt chlorination slag

A technology of molten salt chloride slag and treatment method, which is applied in the field of hydrometallurgy and can solve the problems of eliminating the comprehensive recycling and utilization of molten salt chloride slag without considering radioactivity and the like

Active Publication Date: 2013-08-14
CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, it also does not consider the elimination of radioactivity and the comprehensive recycling of molten salt chlorination slag

Method used

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  • Treatment method of fused salt chlorination slag
  • Treatment method of fused salt chlorination slag

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] 1.1 Mix 200g of molten salt chloride slag with 500ml of 0.5mol / L HCl, stir at room temperature for 1 hour, and filter to obtain 480ml of leaching solution and leaching residue. After the leaching residue is incinerated, the residue amount is 4.3g.

[0055] 1.2 Mix 1ml 2-ethylhexylphosphonic acid mono-2-ethylhexyl ester (P507) with 99ml sulfonated kerosene to obtain a blank organic phase I as the extractant, 0.5mol / L HCl as the washing acid, 0.2mol / L NaOH As a stripping agent, extract, wash, and strip the leachate obtained in 1.1 in sequence. In the separation process, a 30ml separatory funnel was used as the reactor, and the shaking time was 10min. The flow ratio of blank organic phase I, leachate, washing acid and stripping agent in the separation process is 5ml: 25ml: 1ml: 1.5ml; the sequence ratio of extraction, washing and stripping in the separation process is 1:5:1. Obtain raffinate I, washing solution and stripping solution I, mix and treat the obtained washing ...

Embodiment 2

[0060]2.1 Mix 200g of molten salt chloride slag with 2000ml of water, stir at room temperature for 1 hour, and filter to obtain 2010ml of leaching solution and leaching residue. After the leaching residue is incinerated, the residue amount is 4.0g.

[0061] 2.2 Add alkali to adjust the pH value of the leaching solution obtained in 2.1 to 5.5, filter to obtain the precipitation tail liquid and precipitation residue, the precipitation tail liquid is evaporated and crystallized to obtain industrial salt; the precipitation residue is dissolved with hydrochloric acid to obtain feed liquid I.

[0062] 2.3 Mix 50ml P507 with 50ml sulfonated kerosene to obtain a blank organic phase I as the extractant, use 5mol / L HCl as the washing acid, and 4mol / L NaOH as the stripping agent to extract, wash and wash the liquid I obtained in 2.2 in sequence back extraction. In the separation process, a 30ml separatory funnel was used as the reactor, and the shaking time was 10min. The flow ratio of ...

Embodiment 3

[0066] 3.1 Mix 200g of molten salt chloride slag with 600ml of 0.5mol / L HCl, stir at room temperature for 1 hour, and filter to obtain 590ml of leaching solution and leaching residue. After the leaching residue is incinerated, the residue is 4.1g.

[0067] 3.2 Add alkali to adjust the pH value of the leaching solution obtained in 3.1 to 6, filter to obtain the precipitation tail liquid and precipitation residue, the precipitation tail liquid is evaporated and crystallized to obtain industrial salt; the precipitation residue is dissolved with hydrochloric acid to obtain feed liquid I.

[0068] 3.3 Mix 5ml P204 with 95ml sulfonated kerosene to obtain a blank organic phase I as the extractant, use 0.5mol / L HCl as the washing acid, and 4mol / L NaOH as the stripping agent to extract and wash the material liquid I obtained in 3.2 in sequence with stripping. In the separation process, a 30ml separatory funnel was used as the reactor, and the shaking time was 10min. In the separation ...

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Abstract

The invention provides a treatment method of fused salt chlorination slag. The method comprises the following steps: leaching fused salt chlorination slag by water or a dilute acid solution; then, extracting and back-extracting the leaching liquid by using a blank organic phase I as an extractant and an alkaline solution I as a back-extractant so as to obtain a back-extract I; after adjusting the acidity of the back-extract I by acid, extracting and back-extracting the back-extract I by using a blank organic phase II as the extractant and an alkaline solution II as the back-extractant so as to obtain a residual extraction solution II and a back-extract II; adding a scandium precipitator to the residual extraction solution II and filtering and calcining to obtain scandium oxide; and mixing the back-extract II and a thorium and uranium precipitator, and filtering to obtain a thorium and uranium enriched substance. Compared with existing treatment of fused salt chlorination slag, the method provided by the invention not only extracts scandium with high additional value, but also recovers thorium and uranium in waste residue, so that radioactive contamination is eliminated. Meanwhile, chemical materials used in the treatment method provided by the invention are simple and easy to obtain, and the method is lower in cost and simple in process.

Description

technical field [0001] The invention belongs to the technical field of hydrometallurgy, and in particular relates to a treatment method of molten salt chloride slag. Background technique [0002] Titanium dioxide, namely titanium dioxide, is an important inorganic chemical raw material. It is non-toxic and harmless to health. It is currently the best white pigment, accounting for 80% of all white pigments used. It is widely used in paints, rubber, plastics , papermaking, printing ink, daily chemical industry and other fields, its production process is divided into sulfuric acid method and chlorination method. The production and operation process of the sulfuric acid method is very complicated, and its basic chemical reaction contains a series of simple chemical reactions. The three most basic chemical reactions of the sulfuric acid method occur in the stages of acidolysis, hydrolysis and calcination, but the There are shortcomings such as small scale, low output, high cost,...

Claims

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Application Information

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IPC IPC(8): C22B7/00C22B59/00C22B60/00C22B3/38
CPCY02P10/20
Inventor 廖伍平张志峰毕研峰李艳玲
Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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