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Recovery method of titanium oxydichloride waste liquid

A technology of titanium oxychloride and recovery method, which is applied in the preparation of titanium compounds, chemical instruments and methods, titanium oxide/hydroxide, etc., can solve the problems of waste of titanium resources, increase the cost of wastewater treatment, etc., and improve the utilization rate. , Improve application value and economic value, improve the effect of whiteness and hue

Pending Publication Date: 2020-05-19
HENAN BILLIONS NEW MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this treatment method increases the cost of wastewater treatment on the one hand, and causes a waste of titanium resources on the other hand.

Method used

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  • Recovery method of titanium oxydichloride waste liquid

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The tail gas produced during the preparation of titanium dioxide by the chlorination method is absorbed by hydrochloric acid to obtain a waste liquid of titanium dioxychloride. After analysis, the content of iron ions was 90.175ppm. In the case of stirring, continue to feed chlorine into the titanyl chloride waste liquid for 1 hour to fully oxidize the ferrous ions in the titanyl chloride waste liquid, and then use trioctyl decanyl tertiary amine extractant to extract , to obtain a titanyl chloride solution with an iron content of 2.385ppm and an organic extract phase containing ferric ions. Then, the organic extraction phase containing ferric ions is back-extracted with water, and ferric ions and hydrogen ions are extracted into water to obtain an acidic aqueous phase containing ferric ions and trioctyl tertiary amine extractant . During extraction, the volume ratio of organic extractant and titanyl chloride solution is 1:1, carry out 5 stages of extraction, the mixi...

Embodiment 2

[0027] The tail gas produced during the preparation of titanium dioxide by the chlorination method is absorbed by hydrochloric acid to obtain titanium dioxychloride waste liquid. Through analysis, wherein the content of iron ion is 88.335ppm, under the situation of stirring, continue to pass into chlorine gas 3h in this titanium oxychloride waste liquid, fully oxidize the divalent iron in the titanium oxychloride waste liquid, then use The tributyl phosphate extractant is used for extraction to obtain a titanium dioxychloride solution with an iron content of 2.067 ppm and an organic extract phase containing ferric ions. Then, the organic extract phase containing ferric ions is back-extracted with water, and the ferric ions and hydrogen ions are extracted into water to obtain an acidic aqueous phase containing ferric ions and a tributyl phosphate extractant. During the extraction, the volume ratio of the organic phase and the titanyl chloride solution is 1:3, and the 3-stage ex...

Embodiment 3

[0029] The tail gas produced during the preparation of titanium dioxide by the chlorination method is absorbed by hydrochloric acid to obtain a waste liquid of titanium dioxychloride. After analysis, the content of iron ions was 92.508ppm. In the case of stirring, continue to feed chlorine into the titanyl chloride waste liquid for 3h to fully oxidize the ferrous ions in the titanyl chloride waste liquid, and then use N,N-bis(1-methylheptyl base) hexanamide extractant for extraction to obtain a titanyl chloride solution with an iron content of 2.136 ppm and an organic extract phase containing ferric ions. The organic extraction phase containing ferric ions is then back-extracted with water, and ferric ions and hydrogen ions are extracted into water to obtain an acidic aqueous phase containing ferric ions and N, N-bis(1-formazan Heptyl) caproamide extractant. During the extraction, the volume ratio of the organic extractant and the titanyl chloride solution is 1: 5, and the 4...

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Abstract

The invention discloses a recovery method of titanium oxydichloride waste liquid. The recovery method comprises the following steps: extraction: oxidizing iron ions in the titanium oxydichloride wasteliquid, adding an organic extraction agent to the titanium oxydichloride waste liquid, and carrying out countercurrent extraction to obtain a titanium oxydichloride solution with an iron ion contentof less than 3 ppm and an organic extraction phase with a high iron content; and reverse extraction: subjecting the organic extraction phase with high iron content to reverse extraction with water toallow ferric iron and hydrogen ions to enter a water phase so as to obtain an acidic water phase containing ferric iron and the organic extraction agent, wherein the organic extraction agent is recycled and can be reused in the extraction step.

Description

technical field [0001] The invention relates to the technical field of chemical industry, in particular to a recovery method of titanium oxychloride waste liquid. Background technique [0002] Tail gas containing titanium tetrachloride is unavoidably produced during the production of titanium dioxide by the chlorination method. After the tail gas is sprayed and absorbed by dilute hydrochloric acid, an acidic solution of titanium dioxychloride will be produced. Because the titanium oxychloride solution contains impurities such as iron, it is very difficult to recycle, so its treatment method is mostly to neutralize it and then discharge it directly. However, this treatment method increases the cost of wastewater treatment on the one hand, and causes a waste of titanium resources on the other hand. Contents of the invention [0003] The purpose of the present invention is to provide a recovery method of titanium oxychloride waste liquid, which can be applied to the coating...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G23/04C09C1/36C09C3/06
CPCC01G23/04C01G23/001C09C1/3661C09C3/06
Inventor 和奔流陈建立付凌杰李紫金马艳萍豆君
Owner HENAN BILLIONS NEW MATERIAL CO LTD
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