阅读说明：本技术 一种钒钛渣代替矿渣生产普通硅酸盐水泥 (Production of ordinary portland cement by using vanadium-titanium slag instead of slag ) 是由 董艳春 郑伟 贾春利 于 2019-10-16 设计创作，主要内容包括：本发明公开了钒钛渣代替矿渣生产普通硅酸盐水泥,具体涉及建筑材料制备技术领域,主要是普通硅酸盐水泥,所述普通硅酸盐水泥所使用的主要材料包括：熟料、石膏、石灰石、矿渣、燃煤炉渣和钒钛渣。本发明通过使用低氯石膏代替部分脱硫石膏平衡水泥的氯离子,用钒钛矿渣部分替代矿渣,使钒钛渣得以合理利用,在保证水泥质量的同时,降低水泥配料成本,同时缓解承钢排废压力。通过几十组小磨试验及三个月的大磨生产,能够实现50%的钒钛渣代替矿渣生产普通硅酸盐水泥,且生产的水泥强度合格、氯离子满足国标、水泥性能不发生任何变化,配料成本大幅降低。(The invention discloses a method for producing ordinary portland cement by using vanadium-titanium slag instead of slag, and particularly relates to the technical field of preparation of building materials, wherein the ordinary portland cement is mainly prepared from the following main materials: clinker, gypsum, limestone, slag, coal-fired slag and vanadium-titanium slag. According to the invention, the low-chlorine gypsum is used for replacing part of desulfurized gypsum to balance chloride ions of cement, and the vanadium-titanium slag is used for replacing part of slag, so that the vanadium-titanium slag can be reasonably utilized, the cement quality is ensured, the cement batching cost is reduced, and the steel-bearing waste discharge pressure is relieved. Through dozens of groups of small mill tests and three months of large mill production, 50 percent of vanadium-titanium slag can replace slag to produce ordinary portland cement, the produced cement has qualified strength, chloride ions meet the national standard, the cement performance is not changed, and the batching cost is greatly reduced.)

1. The vanadium-titanium slag replaces slag to produce ordinary portland cement, which comprises P.O42.5 and P.S.A32.5 portland cement, and is characterized in that: the main materials used by the Portland cement comprise: clinker, gypsum, limestone, slag, coal-fired slag and vanadium-titanium slag.

2. The vanadium-titanium slag as set forth in claim 1 instead of slag for producing P.S. A32.5 cement, wherein: the preparation method of the P.S.A32.5 cement comprises the following specific operation steps:

the method comprises the following steps: purchasing clinker, gypsum, limestone, slag and vanadium-titanium slag;

step two: respectively taking materials according to a certain proportion and putting the materials into a cement mill for grinding: 48%, 45% and 44% of clinker, 4%, 5% and 6% of gypsum, 6%, 8% and 8% of limestone, 20%, 21% and 42% of slag, and 22%, 21% and 0% of vanadium-titanium slag;

step three: in the grinding process, adding a liquid grinding aid at a grinding belt according to a certain proportion to produce P.S.A32.5 cement;

step four: the P.S.A32.5 cement enters a cement warehouse and is taken out of the warehouse in a matching way, or is delivered out of the warehouse in bulk or in bags, and the waterproof and moistureproof work is paid attention to in the process of storage and delivery.

3. The production of portland cement by using vanadium-titanium slag instead of slag according to claim 2, wherein: and (3) mastering the activity of the vanadium-titanium slag, wherein the activity requirement is more than 75% in 28 days, the chloride ions and the chloride ions in the vanadium-titanium slag are controlled to be less than 0.2%, and the granularity of the clinker, the gypsum, the limestone, the slag and the vanadium-titanium slag in the first step is set to be 30 mm.

4. The method for producing ordinary portland cement by using vanadium-titanium slag instead of slag according to claim 2, wherein the method comprises the following steps: and in the second step, the total usage amount of the slag and the vanadium-titanium slag accounts for 42% of the total amount of the mixed materials, the gypsum is low-chlorine gypsum, and the chloride ion is less than 0.2%.

5. The method for producing ordinary portland cement by using vanadium-titanium slag instead of slag according to claim 2, wherein the method comprises the following steps: the grinding aid in the third step is mainly triethanolamine, and the ratio of the grinding aid to the mixture is as follows: mix = 0.035: 100.

6. the method for producing ordinary portland cement by using vanadium-titanium slag instead of slag according to claim 2, wherein the method comprises the following steps: the specific surface area is controlled to be 380-420, the screen residue of a 80-micron square-hole screen is controlled to be 0.5-1.0 percent, and the screen residue of a 45-micron square-hole screen is controlled to be 6-10 percent.

7. The method for producing ordinary portland cement by using vanadium-titanium slag instead of slag according to claim 1, wherein the method comprises the following steps: the preparation method of the P.O42.5 cement comprises the following specific operation steps:

the method comprises the following steps: purchasing clinker, gypsum, limestone, slag, coal-fired furnace slag and vanadium-titanium slag;

step two: respectively taking materials according to a certain proportion and putting the materials into a cement mill for grinding: 79%, 75% and 75% of clinker, 4%, 5% and 5.5% of gypsum, 4% and 4% of limestone, 4%, 6% and 11.5% of slag, 5%, 6% and 0% of vanadium-titanium slag, 4% and 4% of coal-fired furnace slag;

step three: in the grinding process, adding a liquid grinding aid at a grinding belt according to a certain proportion to produce P.O42.5 cement;

step four: the P.O42.5 cement enters a cement warehouse, is matched with the cement to be delivered out of the warehouse, or is delivered out of the warehouse in bulk or in bags, and is paid attention to the waterproof and moistureproof work in the storage and delivery processes.

8. The production of portland cement by using vanadium-titanium slag instead of slag according to claim 2, wherein: and (3) mastering the activity of the vanadium-titanium slag, wherein the activity requirement is more than 75% in 28 days, the chloride ions and the chloride ions in the vanadium-titanium slag are controlled to be less than 0.2%, and the granularity of the clinker, the gypsum, the limestone, the slag and the vanadium-titanium slag in the first step is set to be 30 mm.

9. The method for producing ordinary portland cement by using vanadium-titanium slag instead of slag according to claim 2, wherein the method comprises the following steps: in the second step, the total usage amount of the slag and the vanadium-titanium slag accounts for 9% -12% of the total amount of the mixed material, the gypsum is low-chlorine gypsum, and the chloride ion is less than 0.2%.

10. The method for producing ordinary portland cement by using vanadium-titanium slag instead of slag according to claim 2, wherein the method comprises the following steps: the grinding aid in the third step is mainly triethanolamine, and the ratio of the grinding aid to the mixed material is as follows: mix = 0.035: 100.

Technical Field

The invention relates to the technical field of building material preparation, in particular to a method for producing ordinary portland cement by using vanadium-titanium slag instead of slag.

Background

Most of the existing cement mixed materials in the north use slag, the slag is an industrial byproduct produced by common iron and steel enterprises, and in recent years, the iron and steel enterprises are subjected to national structure adjustment and environmental protection pressure to stop production and limit production, so that the slag yield is limited, the price rapidly rises, the original price of 45 yuan/ton rises to 150 yuan/ton, and the cement batching cost also greatly rises. Under the condition, vanadium-titanium slag is used for replacing partial slag, so that the cement production cost is greatly reduced under the condition of ensuring that the strength and the performance of the cement are not changed.

The vanadium-titanium slag is an industrial byproduct generated by special vanadium-titanium steel enterprises, compared with common slag, the vanadium-titanium slag has lower activity (about 75-80%) in 28 days and higher chloride ion content (0.1-0.4%), after the vanadium-titanium slag is doped in cement in a certain proportion, firstly, the chloride ions of the cement are likely to exceed the national standard, and simultaneously, the 28-day strength of the cement is reduced more, so that the cement cannot meet the requirements of users, so that the vanadium-titanium slag cannot be fully and effectively utilized in the past decades and almost completely discharged, and larger waste slag mountain is formed around the Chengde steel company, occupies land and destroys the environment.

Therefore, the invention of vanadium-titanium slag instead of slag is necessary for producing ordinary portland cement.

Disclosure of Invention

In order to overcome the defects in the prior art, the embodiment of the invention provides a method for producing ordinary portland cement by replacing slag with vanadium-titanium slag, wherein chloride ions of the cement are balanced by using low-chlorine gypsum to replace part of desulfurized gypsum, the vanadium-titanium slag is reasonably utilized, the slag is partially replaced, the cement quality is ensured, the cement production cost is reduced, and the waste discharge pressure of bearing steel is relieved. At present, 50% of vanadium-titanium slag can be stably replaced by slag, the produced strength is qualified, the performance of cement is not changed, and the chloride ions of the cement meet the national standard, so that the production cost is greatly reduced.

In order to achieve the purpose, the invention provides the following technical scheme: ordinary portland cement, including p.o42.5 and p.s.a3.25 cements, (other varieties of portland cements can also be produced) are produced by replacing part of the slag with vanadium-titanium slag, and the main materials used for the portland cement include: clinker, gypsum, limestone, slag, vanadium-titanium slag and coal-fired slag.

The preparation method of the P.S.A32.5 cement comprises the following specific operation steps:

the method comprises the following steps: purchasing clinker, gypsum, limestone, slag and vanadium-titanium slag;

step two: respectively taking materials according to a certain proportion and putting the materials into a cement mill for grinding: 48%, 45% and 44% of clinker, 4%, 5% and 6% of gypsum, 6%, 8% and 8% of limestone, 20%, 21% and 42% of slag, and 22%, 21% and 0% of vanadium-titanium slag;

step three: in the grinding process, adding a liquid grinding aid at a grinding belt according to a certain proportion to produce P.S.A32.5 cement;

step four: the P.S.A32.5 cement enters a cement warehouse and is taken out of the warehouse in a matching way, or is delivered out of the warehouse in bulk or in bags, and the waterproof and moistureproof work is paid attention to in the process of storage and delivery.

Preferably, in the second step, the total usage amount of the slag and the vanadium-titanium slag accounts for 42% of the total amount of the mixed materials, and the gypsum is low-chlorine gypsum.

Preferably, the grinding aid in the third step is a liquid grinding aid mainly containing triethanolamine, and the ratio of the grinding aid to the mixed material is set as grinding aid: mix = 0.035: 100.

the preparation method of another Portland cement P.O42.5 comprises the following specific operation steps:

the method comprises the following steps: purchasing clinker, gypsum, limestone, slag, coal-fired furnace slag and vanadium-titanium slag;

step two: respectively taking materials according to a certain proportion and putting the materials into a cement mill for grinding: 79%, 75% and 75% of clinker, 4%, 5% and 5.5% of gypsum, 4% and 4% of limestone, 4%, 6% and 11.5% of slag, 5%, 6% and 0% of vanadium-titanium slag, 4% and 4% of coal-fired furnace slag;

step three: in the grinding process, adding a liquid grinding aid at a grinding belt according to a certain proportion to produce P.O42.5 cement;

step four: the P.O42.5 cement enters a cement warehouse, is matched with the cement to be delivered out of the warehouse, or is delivered out of the warehouse in bulk or in bags, and is paid attention to the waterproof and moistureproof work in the storage and delivery processes.

Preferably, the total usage amount of the slag and the vanadium-titanium slag in the second step accounts for 9% -12% of the total amount of the mixed material, the gypsum is low-chlorine gypsum, the chloride ion is less than 0.2%, the main component of the grinding aid in the third step is triethanolamine, and the ratio of the grinding aid to the mixed material is set as the grinding aid: mix = 0.035: 100.

the invention has the technical effects and advantages that:

1. by using the low-chlorine gypsum to replace part of desulfurized gypsum to balance chloride ions of cement, the vanadium-titanium slag is reasonably utilized and partially replaces slag, so that the production cost is reduced while the cement quality is ensured, the environmental pressure is relieved, 50% of vanadium-titanium slag can replace slag, the chloride ions meet the national standard, the strength is qualified, the cement performance is not changed at all, and the production cost is greatly reduced;

2. the method has the advantages that the vanadium-titanium slag is fully utilized to produce the ordinary portland cement, the production cost is reduced, meanwhile, the phenomenon that steel bearing slag piles up and occupies land is solved, reasonable utilization of resources is facilitated, environmental burden is relieved, grinding aids are added in cement processing, cement grindability is facilitated to be improved, and cement yield is improved.

Detailed Description

The following will clearly and completely describe the technical solutions in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.