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Method for improving activity of titanium-containing blast furnace slag

A technology of blast furnace slag and slag, which is applied in the field of improving the activity of titanium-containing blast furnace slag, can solve the problems of glass body reduction, activity reduction, and difficulty, and achieve the effects of reducing grinding difficulty, increasing activity, and saving energy

Inactive Publication Date: 2011-11-23
王永伯
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] There are three main reasons affecting the activity of titanium-containing slag: 1. The titanium in the slag is dispersed in various titanium-containing mineral phases such as perovskite, titanium-rich diopside, titanium diopside, spinel and titanium carbonitride. The embedding relationship is complex
2. The titanium-containing mineral phase grains dispersed in the blast furnace slag are very small, with an average of only about 10 microns, and it is very difficult to remove titanium by conventional mineral processing technology
Less vitreous in slag due to refractory particles not converted into vitreous and less active

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] 1. Three kinds of slag raw materials containing different titanium content are sent into the mixer A for mixing, and the titanium content in the slag after mixing is < 10wt%. Send the mixed slag into the sieve to sieve, and take 10mm as the standard, send the +10mm slag into the crusher for crushing, and crush it to 3-8mm as unburned brick aggregate. Send the -10mm slag into the coarse grinder and crush it to 0.15~1mm; then send the slag crushed to 0.15~1mm to the magnetic separator for dry magnetic separation. The magnetic field strength of the magnetic separator is 3000GS to separate the strong magnetic slag and weak magnetic slag. Send the strong magnetic slag into the ball mill for secondary grinding; crush until +0.15mm through the sieve, and -0.1mm accounts for more than 70wt%. The strong magnetic slag that has been ground for the second time is sent to the magnetic separator again for magnetic separation and iron removal (wet magnetic separation, the magnetic fi...

Embodiment 2

[0038] Embodiment 2: Except for the following difference, other processes are the same as in Embodiment 1: 1. Five different slag raw materials containing titanium are sent into the mixer A for mixing, and the titanium content in the mixed slag is 13wt%; 2. The magnetic field strength of the magnetic separator for dry magnetic separation is 800GS; 3. The magnetic field strength of the magnetic separator for wet magnetic separation is 800GS.

[0039]The weakly magnetic slag powder obtained in this example with a specific surface area greater than 400 square meters per kilogram was tested for activity, and the test results were as follows: the activity index was 59 in 7 days and 80 in 28 days; it exceeded the S75 index specified in the GB / T18046-2008 standard.

Embodiment 3

[0040] Embodiment 3: Except for the following differences, other processes are the same as in Embodiment 1: 1. The titanium content in the slag is 2wt%; 2. The magnetic field strength of the magnetic separator for dry magnetic separation is 6000GS; 3. The wet magnetic separation The magnetic field strength of the magnetic separator is 6000GS.

[0041] The weakly magnetic slag powder obtained in this example with a specific surface area greater than 400 square meters per kilogram was tested for activity, and the test results were as follows: the activity index was 59.5 in 7 days and 81 in 28 days; it exceeded the S75 index specified in the GB / T18046-2008 standard.

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Abstract

The invention discloses a process method for improving the activity of titanium-containing blast furnace slag. The process method comprises the following steps of: A, screening the furnace slag into the furnace slag of more than 10 millimeters and the furnace slag of less than 10 millimeters; B, conveying the furnace slag of less than 10 millimeters into a coarse grinding machine, grinding coarsely to form the furnace slag of between 0.15 and 1 millimeter, conveying the furnace slag of between 0.15 and 1 millimeter into a magnetic separator, and performing magnetic separation to obtain strong-magnetic furnace slag and weak-magnetic furnace slag; and C, grinding the weak-magnetic furnace slag finely, conveying into a powder concentrator, and performing powder concentration, wherein the specific surface area of 400 square meters / kilogram is used as a limit, the weak-magnetic furnace slag of which the specific surface area is more than 400 square meters / kilogram is used as micro powder for cement. In the method, granules which are difficult to grind in the furnace slag are removed by a two-step separation method of the combination of screening before coarse grinding and after fine grinding; simple substance iron and iron oxides in the furnace slag are removed by utilizing the magnetic separator; and the furnace slag is divided into two parts to be grinded, so the grinding difficulty of the furnace slag is reduced, energy is saved, and the activity of the slag is enhanced.

Description

technical field [0001] The invention belongs to the technical field of comprehensive utilization of three wastes, and relates to a method for improving the activity of titanium-containing blast furnace slag so that the titanium-containing blast furnace slag can be fully utilized. Background technique [0002] Blast furnace slag contains silica, aluminum oxide, iron oxide, calcium oxide, magnesium oxide, manganese oxide, titanium dioxide and other substances, which are similar to cement clinker. In recent years, it has been widely used in cement manufacturing and concrete industries. That is to say, it solves the problem of environmental pollution, and at the same time creates huge economic benefits for the enterprise. [0003] The titanium-containing blast furnace slag contains titanium dioxide, which has a great influence on the activity of cement, and elemental iron and refractory particles that have not attracted people's attention, so the activity is very low and cannot...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B7/147B03C1/02
CPCY02P40/10
Inventor 王永伯
Owner 王永伯
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