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Method for dechlorinating and decarbonizing titanium-extraction tailing slag

A technology for extracting titanium tailings and dechlorination, which is applied in the direction of recycling technology, etc., can solve the problems of ineffective decarburization, long process flow, and limited processing capacity, so as to ensure hydration activity, simple process, and improve dechlorination efficiency effect

Active Publication Date: 2017-01-25
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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  • Summary
  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The purpose of the present invention is to provide a method for dechlorination and decarburization of titanium tailings in order to overcome the defects of long process flow, limited processing capacity and ineffective decarburization in the prior art. The method has simple process, short process, good dechlorination and decarburization effect, and can maintain the hydration activity of titanium extraction tailings

Method used

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Embodiment approach

[0028] According to a preferred embodiment of the present invention, the calcination is carried out under the condition of feeding oxygen-containing gas.

[0029] In the method provided by the present invention, the titanium extraction tailings are calcined at high temperature, and the chlorides in the titanium extraction tailings react with oxygen to generate corresponding metal chlorides, chlorine gas and hydrogen chloride, etc., and the chlorine gas and hydrogen chloride are in the form of gases with the air flow escape, thereby realizing the removal of chlorine, and at the same time, free carbon reacts with oxygen to realize decarburization, and the calcination of carbon can also provide a part of the heat source. The inventors of the present invention found that the high-temperature calcination makes the hydration activity of the titanium extraction tailings lose, and the subsequent high-temperature melting-water quenching method restores the glassy state, so that the hydr...

Embodiment 1

[0058] Mix the titanium extraction tailings and iron sulfide powder (particle size<0.1mm) evenly (the mass ratio of titanium extraction tailings and iron sulfide is 100:2), then put it in a high temperature resistant reactor and put it in a muffle furnace. Calcined at 1000°C for 30 minutes under the condition of feeding air containing water vapor (water vapor volume content is 5%), then raised the temperature to 1400°C at a temperature increase rate of 10°C / min, kept it for 10 minutes, and then took it out for water quenching. The content of chlorine and carbon and the hydration activity index in the treated tailings were measured, and the results are shown in Table 2.

Embodiment 2

[0060] Mix the titanium extraction tailings and ferrous sulfate aqueous solution (the mass ratio of titanium extraction tailings to ferrous sulfate is 100:4, and the mass ratio of titanium extraction tailings to water is 100:20), and then put it in a high temperature resistant reactor Put it into a muffle furnace, calcinate at 800°C for 60min under air flow, then raise the temperature to 1500°C at a rate of 15°C / min, keep it for 5min, and then take it out for water quenching. The content of chlorine and carbon and the hydration activity index in the treated tailings were measured, and the results are shown in Table 2.

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Abstract

The invention relates to the field of titanium-extraction tailing slag recycling and discloses a method for dechlorinating and decarbonizing titanium-extraction tailing slag. The method includes the steps of firstly, calcining the titanium-extraction tailing slag, wherein calcining temperature is above 800 DEG C; secondly, heating the material obtained by the calcining until the material melts, keeping the temperature, and performing water quenching. The method for dechlorinating and decarbonizing the titanium-extraction tailing slag is simple in process, short in flow, good in dechlorinating and decarbonizing effect and capable of keeping the hydration activity of the titanium-extraction tailing slag.

Description

technical field [0001] The invention relates to the technical field of recovery and utilization of titanium extraction tailings, in particular to a method for dechlorination and decarburization of titanium extraction tailings. Background technique [0002] Panzhihua Iron and Steel's blast furnace slag contains a large amount of titanium dioxide, which cannot be used efficiently on a large scale. Panzhihua Iron and Steel is developing a high-temperature carbonization-low-temperature chlorination process to extract titanium from its blast furnace slag. The waste slag obtained after titanium extraction is the titanium extraction tailings. The chemical composition of titanium extraction tailings is similar to that of slag cement, and it has hydration activity. Titanium extraction tailings can be used as building materials such as slag powder, but the chlorine content in titanium extraction tailings is as high as 2-5%, far exceeding the standard value 0.06%; in addition, its free...

Claims

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Application Information

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IPC IPC(8): C21B3/04
CPCC21B3/04Y02W30/50
Inventor 曾冠武任艳丽黎建明邵国庆郝建璋文永才
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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