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Method for producing mineral slag micropowder by using titanium extraction tailings

A technology for extracting titanium tailings and slag micropowder is applied in the field of solid waste treatment and resource utilization, which can solve the problems of inability to meet the requirements of energy conservation and environmental protection, high cost of wastewater treatment, and limitation of treatment capacity, and achieves the maintenance of hydration activity and treatment cost. Low, high throughput effects

Pending Publication Date: 2019-07-12
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although a series of studies have been carried out on the elution of chlorine from the tailings of titanium extraction, the dechlorination is not complete, the cost of wastewater treatment is high, the process is long, the treatment capacity is limited, and additional steps are required to remove carbon, which cannot meet the requirements. Energy conservation and environmental protection requirements advocated by the state

Method used

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  • Method for producing mineral slag micropowder by using titanium extraction tailings
  • Method for producing mineral slag micropowder by using titanium extraction tailings

Examples

Experimental program
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Effect test

Embodiment 1

[0047] The technical scheme of the invention is used to remove chlorine and carbon in the tailings of titanium extraction, and the tailings after dechlorination and decarburization are prepared into slag micropowder through grinding.

[0048] The specific steps are:

[0049] Mix the above titanium extraction tailings with 15% activator solution at a liquid-solid ratio of 1.8:1, stir and react for 10 minutes, enter a vertical filter press for pressure filtration, and obtain a filter cake, which is broken into small pieces of particles 400m 2 / kg, its 28-day activity index is 97%, and it can be used or sold instead of S95 grade slag micropowder.

Embodiment 2

[0051] The technical scheme of the invention is used to remove chlorine and carbon in the tailings of titanium extraction, and the tailings after dechlorination and decarburization are prepared into slag micropowder through grinding.

[0052] The specific steps are:

[0053] Mix the above-mentioned titanium extraction tailings with 10% activator solution at a liquid-solid ratio of 1.8:1, stir and react for 10 minutes, and enter the plate and frame filter press for pressure filtration to obtain a filter cake, which is broken into small pieces with particles 400m 2 / kg, its 28-day activity index is greater than 95%, and can be used or sold instead of S95 grade slag powder. Recycling the waste reaction liquid for 50 times still does not affect the dechlorination and decarburization effect.

Embodiment 3

[0055] The technical scheme of the invention is used to remove chlorine and carbon in the tailings of titanium extraction, and the tailings after dechlorination and decarburization are prepared into slag micropowder through grinding.

[0056] The specific steps are:

[0057] Mix the above titanium extraction tailings with 15% activator solution at a liquid-solid ratio of 1.8:1, stir and react for 10 minutes, enter a vertical filter press for pressure filtration, and obtain a filter cake, which is broken into small pieces of particles 400m 2 / kg, its 28-day activity index is 96%, and it can be used or sold instead of S95 grade slag micropowder.

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Abstract

The invention discloses a method for producing mineral slag micropowder by using titanium extraction tailings in the technical fields of solid waste treatment and resource utilization. The method mainly comprises the following steps: firstly preparing a liquid phase activating agent, performing liquid phase activation on titanium extraction tailings by using the activating agent, performing dehydration on the activated titanium extraction tailings, performing crushing, performing calcination, and finally grinding the obtained tailings to obtain the mineral slag micropowder. The method providedby the invention has the following beneficial effects: firstly, liquid phase activation is performed on the titanium extraction tailings, so that very good dechlorination and decarburization effectscan be obtained at a lower calcination temperature, and at the same time, potential hydration activity of the titanium extraction tailings can be well maintained; then low-temperature calcination is performed on the titanium extraction tailings, and grinding is performed, so that the S95-grade mineral slag micropowder can be prepared, and the mineral slag micropowder is used in a project or sold;and the method has the advantages of high dechlorination efficiency, low treatment costs, a large processing amount, a short process, good environmental protection and a good energy saving effect, andthe product has certain added value and large market capacity, and is a very good path for large-scale consumption of the titanium extraction tailings.

Description

technical field [0001] The invention relates to the technical field of solid waste treatment and resource utilization, in particular to a method for dechlorination and decarburization treatment and resource utilization of titanium extraction tailings. Background technique [0002] A steel company discharges about 6-7 million tons of titanium-containing blast furnace slag every year, of which the titanium dioxide content is between 20% and 26%. Titanium-extracting tailings are residues produced by high-temperature carbonization-low-temperature chlorination of titanium-containing blast furnace slag. The chemical composition of titanium-extracting tailings is similar to that of slag cement, and it has hydration activity. It can be used as building materials such as slag powder. However, the chlorine content in titanium extraction tailings is as high as 2%-4%. If it is used directly as a cement admixture, its addition ratio will be greatly reduced; if it is used as slag powder a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B18/14C04B24/04
CPCC04B18/144C04B40/0042C04B22/147C04B22/149C04B24/04C04B22/10C04B22/085Y02W30/91
Inventor 任艳丽邵国庆曾冠武黎建明郝建璋
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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