JPS60112654A - Manufacture of cement clinker - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for producing cement l-clinker using iron-containing dust generated from a steelworks as iron metal PI for cement clinker.

Bronze statues, which are produced as a by-product during copper smelting, or pyrite cinder, which is produced as a by-product during sulfuric acid production, have traditionally been used as iron raw materials added during the production of Cement Kurino J. In response to the decline in production capacity and the price of I3 used as a raw material for steelmaking, it has been proposed in recent years to use iron-containing powder produced as a by-product from steelworks. There is.

These proposals include a method of adding iron powder containing zinc and iron as a coloring component of cement clinker and an adjuvant to the clinker raw material, and a method of adding hydrated iron sludge generated in steel plants to a humidified collection method. There is a method for producing iron source for cement, which involves kneading q powder and converter slag and air drying.

However, in this conventional method, zinc and chloride ions are
It does not suggest any negative effects.

The purpose of this invention is to study the negative effects on clinker due to the presence of zinc and chloride ions contained in collected dust generated from steel plants, and to use it as a raw material for cement 1 to clinker without these obstacles. .

The structure of the present invention is to roast a mixture containing one or more other iron oxide-containing powders generated from iron oxides, mainly using the secondary blast furnace process generated from steel factories, and to remove water and moisture.
A method for producing cement clinker, characterized in that burnt ore from which combustible components have been removed and whose zinc oxide content is 3% or less is appropriately moistened and used as a raw material for producing cement clinker as a clinker river iron raw material. It is.

- To explain the configuration described in F, the secondary blast furnace method is to dedust the blast furnace gas flowing out from the top of the blast furnace in a dust chamber, remove the secondary ash, and then wet-collect the gas with a Venturi scrubber. Silafree - dust ash precipitated by equipment, also called thickener ash.

Among the iron oxide-containing powders other than the secondary blast furnace process, there are the following:

Casthouse dust Dust (mainly metal fume) generated in a blast furnace casthouse is collected using a bag filter.

Steelmaking Dust I ~ Environmentally collected dust generated during the process of desulfurizing blast furnace pig iron using nitrogen gas at a steelmaking factory.

Raw Material A Dust Dust collected during the coke transportation process at a coke factory (mainly coke powder).

FO20
3 content ■ is very large.

This invention involves adding one or more of the above-mentioned iron-making dust collection powders to the secondary blast furnace process to adjust the components in the mixture, and using it as a raw material for cement clinker. The contents of the main components are as listed in Table 1 below.

Table 1 The reason for limiting the zinc content (■) in this invention is
This is because the content of zinc in the clinker has an adverse effect on the setting time and strength of Cement 1.

To explain this more specifically, Figure 1 is a graph showing the relationship between the setting time of cement and the ZnO content in the clinker. As the temperature increases, both the start and end time of cement setting tend to increase.

Figure 2 shows the relationship between the compressive strength of the trial cement mortar and the ZnO content in the clinker, and the ZnO content m in the clinker is 0.3% or less, more preferably about 0.1% or less. J: Overall, it can be said that the influence of the presence of zinc is tolerable. By the way, the relationship between the content of Zno in the burned ore used in the method of this invention and the content of ZnO in the clinker using it is as shown in Table 3, and from this result, some margin is taken. The content of Zno in the burnt ore shall be 2.7% or less.

In addition, it is important to control the humidity of the burnt ore in order to prevent the burning, and in this case, the moisture content is preferably 2 to 10%. If it exceeds 10%, depending on the type of small brim, it will stick to the wall and cause blockage.

Moreover, if it is less than 2%, there is no dust generation prevention effect.

Note that when the tempering water contains chlorine, for example, when seawater is used as the tempering water, care must be taken with the chlorine content.

In addition, if the content of chlorine is high, operational problems such as the closure of cement kilns will occur, so the city should be
It is preferable to limit it to p or less.

An example of the manufacturing process of the burned ore used in the method of the present invention will be explained with reference to the drawings.The raw material powder produced by mixing iron oxide-containing powder as exemplified in Sagi in the secondary blast furnace method is used. The raw material powder is put into the agitator 1 together with water, the raw material powder is suspended in water, and the slurry is sent to the fluidized fluidized roasting furnace 2 using the pump 9. Air is also sent into the furnace from the combustion air blower 10 to disperse the raw material. While fluidizing, the carbon content in the raw material 1 is combusted at a temperature of 950°C, and the raw material powder is turned into burnt ore. The burned ore overflowing from the fluidized bed and the burned ore collected by the boiler 5 and the cyclone 6 enter the humidity controller 4 via the flow conveyor 3. Moisture is replenished by the humidity controller 4, and appropriate turbidity is added to produce the product, the burnt ore.

The fine sintered ore not collected by the cyclone 6 is collected by the peabo disc scrubber 7 and returned to the original ore for repeated use.

The 41 qualities of cement when using burnt ore in this invention will be specifically explained.

Cemen 1 - Blast furnace cement B using plain copper, a 1:1 mixture of copper and burnt ore, and plain burnt coal as the raw material for clinker
The test results of the scale are shown in Table 4 and are J5 Yu.

Table 4 An example of the chemical analysis value of this burnt ore was as follows.

As explained above, according to the present invention, industrial waste such as blast furnace secondary process and IFJ iron dust can be effectively used as a raw material for cement iron instead of the conventionally used docker and pyrite cinder. Moreover, the quality of the clinker can be maintained without any change from conventional methods.

[Brief explanation of drawings]

Figure 1 is a trial production [? Figure 2 is a graph showing the relationship between the cement setting time and the content of zinc oxide in the clinker. Figure 2 is a graph showing the relationship between the compressive strength of the trial cement and the zinc oxide content in the clinker. An example of a T culm for producing burnt ore used in the invention is shown, and a system diagram is shown, respectively. 1...Agitator-12...Fluidized roasting furnace, 3...
Bell] -1 Bearer, 4... Humidity conditioner, 5... Boiler, 6... Cyclone type dust collector, 7... Vibo disk scrubber, 8... Waste heat boiler, 9...・Pump, 10... Air blower 1 Patent applicant: New Iron and Steel Chemical Industry Co., Ltd. Kowa Refining Co., Ltd. Stock attorney, Patent attorney Hide Komatsu, Attorney Hatake, Patent attorney Hiroshi Asahi

Claims (3)

[Claims] (1) ゛Based on the secondary blast furnace process generated from steelworks,
A mixture containing one or more other iron oxide-containing powders generated from steel mills is roasted to remove moisture and combustible components, and to reduce the zinc oxide content to 3% or less. Burnt ore is cooked appropriately to produce cement as raw material for clinker river iron.
~Talin Power-1! A method for producing cement clinker, characterized in that it is mixed with J. (2) The claimed scope (
1) The method for producing cement clinker as described above. (3) The cement clinker VJ manufacturing method according to claim (1) or (?), wherein the chlorine content in the burnt ore after humidity conditioning is iooppm or less.