WO2008138170A1

WO2008138170A1 - Dry powder mortar made from steel slag and a method for producing it

Info

Publication number: WO2008138170A1
Application number: PCT/CN2007/001557
Authority: WO
Inventors: Jianwei Wang
Original assignee: Cao, Bugao; Hou, Yucai; Wang, Pengcheng
Priority date: 2007-05-14
Filing date: 2007-05-14
Publication date: 2008-11-20

Abstract

Dry powder mortar made from steel slag is disclosed, and it is mainly made from, in wt%, steel slag sand of 60-75 and cement and fly ash of 20-40, wherein a ratio of steel slag sand to cement and fly ash is 2:3. A method for producing the mortar comprises drying the steel slag to water content of 0.5% below, and making it into steel slag sand with particle diameter of 2.5 mm below; mixing the steel slag sand of 60-75% and the cement and fly ash, in a ratio of 2:3, of 25-40% to prepare a mixture; pulse homogenizing the mixture to uniformity of CV<0.3%; and packing to obtain the final mortar. The mortar has all of properties that traditional mortar has, and can be used in place of the conventional one. The mortar has good durability, freeze proof and binding strength, and its cost is 50% of cost of the conventional one. The invention uses a great deal of the steel slag, makes resources recycle, and solves problems of pollution from waste materials of steel-making plant.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the technical field of building materials, and in particular to a formulation for producing dry powder mortar using steel slag and a processing technique thereof. BACKGROUND OF THE INVENTION Dry mortar is also known as dry mortar. It is a dry powdered aggregate (sand), a cementitious material (fly ash, cement), chemical additives, etc., and is scientifically controlled, mixed and homogenized, and chemically reacted. Mechanized production, product packaging or bulk logistics are transported to the site. When working, just add a certain proportion of water and mix well, then you can use the new dry powder mortar directly.

The existing dry mortar at home and abroad is to dry the sand and then sieve it. According to the proportion of the conventional mortar mix ratio, the dry sand, cement, auxiliary materials and additives are weighed and then packaged by a single mechanical mixing and mixing. Dry mortar products. The shortage of raw materials and high prices of such products has resulted in high production costs and it is difficult to adapt to the price tolerance of the domestic market.

Steel slag refers to the slag which is produced after steel making. After the slag is crushed, the iron and broken iron are taken out for recovery, and the steel slag (also called tailings) is left. The steel slag contains silicon trioxide, aluminum oxide, ferric oxide, calcium oxide, magnesium oxide, etc., and has a hard mass (Mohs hardness of about 8.5 degrees), and a specific gravity of about 1.45 B屯/M ³ . Steel slag is generally stored as industrial waste and has not yet been fully utilized.

The inventors have found through extensive experiments that the characteristics of steel slag are suitable for dry mortar, intentionally turning waste into treasure, to reduce the production cost of dry mortar, and specially developed the formula and processing technology for producing dry powder mortar by using steel slag. . SUMMARY OF THE INVENTION The object of the present invention is to provide a steel slag dry mortar and a processing technique thereof, so as to fully utilize steel slag, turn waste into treasure, and reduce the cost of mortar.

In order to achieve the above object, the solution of the present invention is that the steel slag dry silt is mainly prepared by weighting the following materials: steel slag 60-75%, cement and fly ash 25-40%, cement and fly ash The ratio is 2: 3.

The 5% by weight of the auxiliary agent is 0. 1% by weight.

The above auxiliary agent is selected from a water reducing agent.

The above auxiliary agent is selected by mixing acrylic acid, cellulose and thickener in any ratio. The above auxiliary agent is selected from the re-decomposable latex powder.

The above cement can be selected from three-in-one cement powder, and the three-in-one cement is composed of steel slag by weight percentage.

60-70%, bottom slag 10- 15%, accessories 15- 30%.

The above three-in-one cement is specifically made of 70% steel slag, 13% bottom slag, and 17% auxiliary material. The above bottom slag may be replaced by fly ash.

The above auxiliary materials are a mixture of 60-70% of coal gangue, 5-15% of gypsum, and 15-25% of clinker.

The above auxiliary materials are preferably selected from the group consisting of 70% coal gangue, 10% gypsum, and 20% clinker. The steel slag dry mortar is processed by the following method: first, the steel slag is dried to a water content of 0.5% or less, and is made into a steel slag grit having a particle diameter of 2. 5 mm or less; and then according to a steel slag, 60-75%, cement and fly ash. 25-40%, the proportion of cement and fly ash is 2:3 ratio; then, pulse homogenization is mixed until the uniformity is CV<0.3%; the final packaging is the finished steel slag dry mortar.

The processing technology of three-in-one cement is: firstly, the steel slag, the bottom slag and the auxiliary materials are respectively dried to a water content of 2-3%; then, the coarse grinding is respectively performed until the particle diameter is 5 mm or less; and then the steel slag is 60-70%, 3%。 The furnace bottom slag 10-15%, the proportion of the auxiliary material 15-30%, and the fine-grained to a specific surface area of 450m ² / Kg or more; Finally, pulse homogenization mixed to a uniformity of CV <0. 3% , that is, the finished three-in-one cement.

After adopting the above formula and processing technology, the invention has the full performance of the traditional dry mortar, and can completely replace the traditional dry mortar, and the durability, freeze-thaw resistance and bonding strength are better than the traditional dry mortar; the invention is incorporated into the steel slag up to 60 More than %, the technology is only at home and abroad, the cost is low, and the direct cost of the product is only 50% of the traditional dry mortar product; the invention fully utilizes the steel slag and turns waste into treasure, especially the three-in-one cement is used as the cementing agent. The recycling of resources is used to completely solve the pollution problem of industrial waste in steelworks. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing a process flow of the present invention;

2 is a block diagram showing the processing flow of the three-in-one cement selected by the present invention. BEST MODE FOR CARRYING OUT THE INVENTION The steel slag dry mortar according to the present invention is made up of 60-75% by weight of major steel slag sand, 25-40% of cement and fly ash, and the ratio of cement to fly ash is 2:3.

Steel slag sand plays an aggregate role in the whole formula. As the proportion of steel slag sand increases, the product cost of dry mortar will decrease, but the consistency, stratification and strength will also decrease. The reduction of steel slag will increase the cost of the product but the consistency. , stratification and strength are also high. Cement and fly ash play a role in the entire formulation, and as the ratio of cement and fly ash increases, the cost of the product rises. High but high consistency, stratification and strength, reduced cement and fly ash will reduce product cost but decrease consistency, stratification and strength. The auxiliary agent plays a functional adjustment role in the whole formulation, and the steel slag dry mortar slurry may be further provided with a 0% by weight of an auxiliary agent, an auxiliary agent for a water reducing agent, or an acrylic acid or cellulose. The thickener is mixed at any ratio, or a re-decomposable latex powder (polymer) is used.

The processing technology of steel slag dry mortar is shown in Figure 1:

5%。 The steel slag was dried to a moisture content of 0.5%. The drying system mainly processes the materials required for the product in the raw product process to achieve the moisture content of the material within 3%, which guarantees the technical specifications specified in the production process.

The dried steel slag is made into dry steel slag sand having a particle diameter of 2. 5 mm or less. The steel slag of the particle diameter of 2. 5mm or less is directly sifted out for use, and the steel slag sand having a particle diameter of 2. 5mm or more enters the sand making system to form granules. Dry sand with a diameter of 2. 5 mm or less. The aggregate of the steel slag dry mortar is sand. In the present invention, the steel slag is dried into sand to replace the river sand to have better product performance and reduce cost.

In the batching system, 60-75% of steel slag, 25-40% of cement and fly ash, and a ratio of cement to fly ash of 2:3 are used for compounding.

Then, the pulse homogenization is performed in the pulse mixing homogenization system until the uniformity is CV<0.3%, so that the product is not stratified, non-segregated, and homogenized.

Finally, it is output by the pneumatic conveying system, packaged into bags in the packaging system as needed, or bulked into the material system.

Among them, the cement used in the present invention may be selected from ordinary cement or 3-in-1 cement powder. The three-in-one cement powder is made of 60-70% steel slag, bottom slag (which can also be replaced by fly ash, which is equivalent) 10-15%, and auxiliary materials 15- 30%. The excipient may be a mixture of 60-70% coal gangue, 5-15% gypsum, and 15-25% clinker, especially 70% coal gangue, 10% gypsum, and 20% clinker. The formula can also be added with additives according to the quality of the steel slag. The additive is made of aluminum sulfate, ethylene glycol, curing agent, acrylic acid and amine, so that the finished cement can reach the national standard PC32. 5 cement standard and the quality is better.

Steel slag is used to replace the semi-finished product in the original cement processing process - clinker. When the steel slag is ground to a specific surface area of 450 m ² /Kg or more, it will activate in the whole formula, and the amount of steel slag will increase. The cost of three-in-one cement products is reduced but the stability is poor, while the reduction of steel slag will increase the cost of the product but the stability is good. The bottom slag (or fly ash) and auxiliary materials play a role in neutralizing the steel slag and complementing the chemical properties throughout the formulation. As the proportion of the bottom slag (or fly ash) and auxiliary materials increases, the three The cost of a cement product is high, the stability is good, but the strength is poor. The reduction of bottom slag (or fly ash) and auxiliary materials will reduce the cost of the product, and the stability is poor but the strength is good. Therefore, the specific formula of the three-in-one cement is 70% steel slag, 13% bottom slag, and 17% excipients.

The processing technology of three-in-one cement is shown in Figure 2: The steel slag, the bottom slag and the auxiliary materials are respectively dried to a water content of 2-3% by a drying system. The drying system mainly processes the materials required for the product in the raw product process to achieve the moisture content of the material within 3%, which guarantees the technical indicators specified in the production process. Then, the dried material is coarsely ground by a coarse grinding system to a particle diameter of 5 mm or less, and the pre-treatment is performed for the next process. In the batching system, the proportion is 60-70% of steel slag, 10-15% of bottom slag, and 15-30% of auxiliary materials. The batching system is the most important in the whole production process, and the accurate ingredients can ensure the quality of the product. Therefore, the measurement accuracy of the bulk material in the process is less than 0.5% precision, the measurement accuracy of the small material batching 2%的精度。 Achieved less than 0.2% accuracy. And through the grinding system, the prepared materials are finely ground. The system uses a counter-rotating super-gravity grinding process, and the grinding fineness reaches the specific surface area under the action of physical mechanics, chemistry and instantaneous ultra-high temperature. For the above 450m ² /Kg, the various properties of the material are changed to meet the national standard PC32. 5 cement standard. Then, pulse homogenization is carried out in a pulse mixing homogenization system. Since the composition of the steel slag three-in-one cement is complicated, it is composed of a plurality of materials and components, and the pulse mixing system is fully utilized for its components. After the fine grinding after the above grinding, and then homogenizing by the system to a uniform hook degree of CV <0.3%, the quality requirement of the final product can be achieved. Finally, through the pneumatic conveying system, enter the packaging system as needed, packaged into three-in-one bagged cement, or bulk three-in-one cement into the material system.

Claims

Rights request

1. Steel slag dry mortar, which is mainly composed of the following materials in weight percentage: 60-75% steel slag, 25-40% cement and fly ash, and 2:3 cement and fly ash.

2%。 The steel slag dry mortar, characterized in: the steel slag dry powder mortar is also provided with an auxiliary agent, the weight percentage of the adjuvant 0-0. 1%.

The steel slag dry silt paddle according to claim 2, wherein the auxiliary agent is a water reducing agent or a re-decomposable latex powder.

The steel slag dry mortar according to claim 2, wherein the auxiliary agent is a mixture of acrylic acid, cellulose, and a thickener.

5. The steel slag dry mortar according to claim 1, wherein: the cement is selected from three-in-one cement powder, and the three-in-one cement is 60-70% by weight of steel slag, and the bottom slag is used.

10-15%, excipients 15- 30%.

The steel slag dry mortar according to claim 5, wherein the three-in-one cement is specifically made of steel slag 70°/. , the bottom of the slag is 13%, and the auxiliary material is made of 17%.

The steel slag dry mortar according to claim 5, wherein the auxiliary material is a mixture of 60-70% of coal gangue, 5-15% of gypsum, and 15-25% of clinker.

The steel slag dry mortar according to claim 7, wherein the auxiliary material is preferably 70% coal gangue, 10% gypsum, and 20% clinker.

The steel slag sand particles having a particle diameter of 2. 5 mm or less; and then according to the steel slag, the steel slag is dried to a water content of 0.5% or less; The ash is 60%, the cement and the fly ash are 25-40%, and the ratio of the cement to the fly ash is 2:3. The final packaging is the finished steel slag dry mortar.

10 . The processing technology of the three-in-one cement according to claim 5 , wherein: the steel slag, the bottom slag and the auxiliary materials are respectively dried to a water content of 2-3%; and then, respectively, coarsely pulverized to a particle diameter of 5ran or less; further according to the ratio of 60-70% steel slag, 10-15% bottom slag, 15-30% of auxiliary materials, and finely ground to a specific surface area of 450m7Kg or more; finally, pulse homogenization to uniformity For CV<0.3%, it is the finished three-in-one cement.