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Dechlorination process for titanium extraction tailings and preparation method of ore slag micropowder

A technology for removing titanium tailings and dechlorination, which is applied in the directions of climate sustainability, sustainable waste treatment, solid waste management, etc. Make good use of the effect

Inactive Publication Date: 2018-09-11
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In the prior art, water washing is generally used to remove chlorine, such as a treatment method for extracting titanium tailings (application number CN201310288715.7), a pollution-free treatment method and system for extracting titanium tailings by chlorination (application number CN201410148402 .6), the chlorine removal method of titanium tailings extraction (application number CN201410279998.3), the chlorine removal method of titanium tailings extraction by chlorine method (application number CN201510794556.7), but the process is long and the processing capacity is limited. and requires additional steps to remove carbon

Method used

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Examples

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Embodiment 1

[0027] This embodiment provides a dechlorination process for extracting titanium tailings, wherein, in terms of mass percentage, the main components of titanium extraction tailings are CaO26.5%, MgO8.78%, SiO 2 25.3%, TiO 2 7.7%, Al 2 o 3 13.0%, free carbon 8.6% and chlorine 3.28%, the hydration activity index of titanium extraction tailings is 105%.

[0028] Specifically, the above titanium extraction tailings are mixed with ammonium sulfate powder, wherein the amount of ammonium sulfate added is 5% of the titanium extraction tailings. Then place it in the reactor, put it in a muffle furnace at 800°C, open the furnace door slightly, keep the air convection, calcine for 60min, take it out and cool it, the chlorine content of the titanium extraction tailings after roasting is reduced to 0.052%, and the extracted titanium slag after roasting is reduced to 0.052%. Titanium tailings are ground on a planetary ball mill until the specific surface area > 400m 2 / kg, the slag acti...

Embodiment 2

[0031] This embodiment provides a dechlorination process for titanium extraction tailings. Specifically, the titanium extraction tailings provided in Example 1 are mixed with ammonium nitrate powder, wherein the amount of ammonium nitrate added is 5% of the titanium extraction tailings. Put it in a reactor, put it into a 700°C muffle furnace, slightly open the furnace door, keep the air convection, calcine for 120min, take it out and cool it, the chlorine content of the titanium extraction tailings after roasting is reduced to 0.049%, and the titanium extraction slag after roasting is reduced to 0.049%. The tailings are ground on a planetary ball mill until the specific surface area is >400m 2 / kg, the 28-day activity index of tailings is 96%, which can be used or sold instead of S95 grade slag powder.

Embodiment 3

[0033] This embodiment provides a dechlorination process for extracting titanium tailings. Specifically, ammonium carbonate is made into a solution and mixed with the titanium extraction tailings in Example 1, wherein the amount of ammonium carbonate added is 8% of the titanium extraction tailings. %. Put it in a reactor, put it into a 600°C muffle furnace, open the furnace door slightly, keep the air convection, calcine for 120min, take it out and cool it, the chlorine content of the titanium extraction tailings after roasting is reduced to 0.056%, and the titanium extraction slag after roasting is reduced to 0.056%. The tailings are ground on a planetary ball mill until the specific surface area is >400m 2 / kg, the 28-day activity index of tailings is 97%, which can be used or sold instead of S95 grade slag powder.

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Abstract

The invention relates to the field of metallurgic solid waste treatment and particularly relates to a dechlorination process for titanium extraction tailings and a preparation method of ore slag micropowder, wherein the dechlorination process includes steps of mixing the titanium extraction tailings with a dechlorination agent and calcining the mixture for 30-120 min at 300-800 DEG C. The processnot only achieves dechlorination of the titanium extraction tailings but also can maintain the glass phase structure of the titanium extraction tailings, thus supplying guarantee for recycling utilization. The ore slag micropowder is reduced to lower than 0.06% in chlorine content, is reduced to lower than 1% in free carbon content, and contains more than 85% of the glass phase structure in a mineral phase structure. After the dechlorination, the titanium extraction tailings, after milling, can reach more than 95% in 28-day activity index, so that the product can be used or sold as a substitution of S95-grade ore slag micropowder.

Description

technical field [0001] The invention relates to the field of metallurgical solid waste treatment, in particular, it relates to a dechlorination process of titanium extraction tailings and a preparation process of slag fine powder. Background technique [0002] Panzhihua Iron and Steel emits about 3 million tons of titanium-containing blast furnace slag every year, of which titanium dioxide content is between 20% and 26%. In order to make full use of the titanium resources in blast furnace slag, Panzhihua Iron and Steel develops high-temperature carbonization-low-temperature chlorination to produce titanium tetrachloride However, this process still produces a large amount of chlorinated tailings after extracting titanium resources, and the resulting chlorinated tailings are titanium extraction tailings. To achieve a "green ecological" process, titanium extraction tailings must be used on a large scale. The chemical composition of titanium extraction tailings is similar to tha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B20/04C04B18/14
CPCC04B18/141C04B20/04C04B20/023Y02W30/91
Inventor 任艳丽邵国庆曾冠郝建璋
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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