阅读说明：本技术 一种利用多源工业副产石膏调节水泥性能的方法 (Method for adjusting cement performance by using multisource industrial byproduct gypsum ) 是由 邹波 潘波 汤戈 刘�文 马德武 蒲灵 田犀 于 2020-04-24 设计创作，主要内容包括：本发明公开了一种利用多源工业副产石膏调节水泥性能的方法,属于调节水泥性能的方法技术领域,将破碎后的磷石膏、钢厂脱硫石膏、电厂炉内脱硫燃煤灰渣和芒硝石膏先投入至搅拌机内搅拌10-20min；再将水泥投入至搅拌机内再加热至40-60℃,并加入软水至搅拌机内搅拌2-3h；将搅拌好的磷石膏、钢厂脱硫石膏、电厂炉内脱硫燃煤灰渣和芒硝石膏与水泥的混合物进行过滤脱水处理；将过滤脱水好的磷石膏、钢厂脱硫石膏、电厂炉内脱硫燃煤灰渣和芒硝石膏与水泥的混合物风干晾晒处理；将磷石膏、钢厂脱硫石膏、电厂炉内脱硫燃煤灰渣和芒硝石膏与水泥的混合物投入至成粒机内进行制粒,进而实现了将工业石膏的二次利用,节约资源的同时也保护了环境。(The invention discloses a method for adjusting cement performance by using multisource industrial byproduct gypsum, which belongs to the technical field of methods for adjusting cement performance, and is characterized in that crushed phosphogypsum, steel plant desulfurized gypsum, desulfurized coal ash in a power plant furnace and mirabilite gypsum are firstly put into a stirrer to be stirred for 10-20 min; putting the cement into a stirrer, heating to 40-60 ℃, adding soft water into the stirrer, and stirring for 2-3 h; filtering and dehydrating the mixture of the stirred phosphogypsum, the desulfurized gypsum of the steel plant, the desulfurized coal ash in the furnace of the power plant and the mirabilite gypsum and the cement; air-drying and airing the mixture of the filtered and dehydrated phosphogypsum, the desulfurized gypsum of a steel mill, desulfurized coal ash in a power plant furnace and mirabilite gypsum and cement; the phosphogypsum, the steel mill desulfurized gypsum, the power plant furnace desulfurized coal ash and the mixture of the mirabilite gypsum and the cement are put into a granulator for granulation, so that the secondary utilization of the industrial gypsum is realized, the resource is saved, and the environment is protected.)

1. A method for adjusting cement performance by using multisource industrial byproduct gypsum is characterized by comprising the following steps:

step 1: quantitatively weighing phosphogypsum with the water content of 10-20%, steel mill desulfurized gypsum, desulfurized coal ash residue in a power plant furnace and mirabilite gypsum; the total weight of the weighed multisource gypsum accounts for 70-95%, and the cement accounts for 5-30%;

step 2: putting phosphogypsum, steel plant desulfurized gypsum, desulfurized coal ash in a power plant furnace and mirabilite gypsum into a crusher for crushing;

and step 3: putting the crushed phosphogypsum, steel plant desulfurized gypsum, desulfurized coal ash in a power plant furnace and mirabilite gypsum into a stirrer and stirring for 10-20 min;

and 4, step 4: putting the cement into a stirrer, heating to 40-60 ℃, adding soft water into the stirrer, and stirring for 2-3 h;

and 5: filtering and dehydrating the mixture of the stirred phosphogypsum, the desulfurized gypsum of the steel plant, the desulfurized coal ash in the furnace of the power plant and the mirabilite gypsum and the cement;

step 6: air-drying and airing the mixture of the filtered and dehydrated phosphogypsum, the desulfurized gypsum of a steel mill, desulfurized coal ash in a power plant furnace and mirabilite gypsum and cement;

and 7: putting the phosphogypsum, the desulfurized gypsum of the steel plant, the desulfurized coal ash in the power plant furnace and the mixture of the mirabilite gypsum and the cement into a granulator for granulation.

2. The method for adjusting the performance of the cement by using the multi-source industrial byproduct gypsum according to claim 1, wherein the step 1 is carried out by electronic weighing, and phosphogypsum, steel mill desulfurized gypsum, desulfurized coal ash in a power plant furnace and mirabilite gypsum are mixed in a ratio of 1:2:1: 2.

3. The method of claim 1, wherein in step 2, after the phosphogypsum, the steel plant desulfurized gypsum, the power plant furnace desulfurized coal ash and the mirabilite gypsum are crushed, soft water is thrown into the crusher for washing, and the washed mixture is thrown into the stirrer.

4. The method as claimed in claim 1, wherein the rotation speed of the mixer in step 3 is 300-.

5. The method for adjusting cement properties by using multi-source industrial byproduct gypsum according to claim 1, wherein the step 5 is performed by pouring into a high-speed centrifugal machine for spin-drying.

6. The method for adjusting cement performance by using multi-source industrial byproduct gypsum according to claim 1, wherein natural air drying is adopted in the step 6 during air drying.

7. The method for adjusting cement properties by using multi-source industrial byproduct gypsum according to claim 1, wherein a twin screw granulator is used in the granulation in step 7.

Technical Field

The invention relates to a method for adjusting cement performance by using industrial byproduct gypsum, in particular to a method for adjusting cement performance by using multisource industrial byproduct gypsum, belonging to the technical field of methods for adjusting cement performance.

Background

Generally, when cement is hydrated, gypsum (CaSO4.xH2O) in the cement is quickly dissolved in water to form a CaSO4.2H2O saturated solution, and the saturated solution reacts with Ca (OH)2 and hydrated aluminum phases generated by hydration of C3A to generate ettringite, the ettringite is covered on the surfaces of cement particles to form a coating film, water molecules and other ions are prevented from diffusing to the coated cement particles, so that the continuous hydration of the cement particles, particularly C3A minerals, is a retarding mechanism of the gypsum in the cement hydration process, comprehensively considers the characteristics of various gypsum minerals, and the gypsum which takes dihydrate gypsum (CaSO4.2H2O) with proper solubility and dissolution rate as main constituent minerals is more commonly used as a cement retarder.

The industrial by-product gypsum and the natural gypsum are mainly dihydrate gypsum, and theoretically, the industrial by-product gypsum can completely replace the natural dihydrate gypsum to be used as a cement retarder. However, the industrial by-product gypsum is different from natural dihydrate gypsum in chemical composition, gypsum mineral type, total impurity type and content due to process variation, and thus is greatly different from natural dihydrate gypsum in solubility characteristics and interaction with cement clinker minerals.

Based on the influence of multisource industrial by-product gypsum on the hydration process and the performance of cement and the self-generating characteristics of various industrial by-product gypsum, researches find that the retarder prepared by multisource industrial by-product gypsum can break through the respective defects and shortcomings of the multisource industrial by-product gypsum and simultaneously play a synergistic effect, so that a method for adjusting the performance of cement by using multisource industrial by-product gypsum is designed to optimize the problems.

Disclosure of Invention

The invention mainly aims to provide a method for adjusting the performance of cement by using multi-source industrial byproduct gypsum, which quantitatively weighs phosphogypsum with the water content of 10-20%, steel mill desulfurized gypsum, desulfurized coal ash residue in a power plant furnace and mirabilite gypsum; the total weight of the weighed multisource gypsum accounts for 70-95%, and the cement accounts for 5-30%; putting phosphogypsum, steel plant desulfurized gypsum, desulfurized coal ash in a power plant furnace and mirabilite gypsum into a crusher for crushing; putting the crushed phosphogypsum, steel plant desulfurized gypsum, desulfurized coal ash in a power plant furnace and mirabilite gypsum into a stirrer and stirring for 10-20 min; putting the cement into a stirrer, heating to 40-60 ℃, adding soft water into the stirrer, and stirring for 2-3 h; filtering and dehydrating the mixture of the stirred phosphogypsum, the desulfurized gypsum of the steel plant, the desulfurized coal ash in the furnace of the power plant and the mirabilite gypsum and the cement; air-drying and airing the mixture of the filtered and dehydrated phosphogypsum, the desulfurized gypsum of a steel mill, desulfurized coal ash in a power plant furnace and mirabilite gypsum and cement; the phosphogypsum, the steel mill desulfurized gypsum, the power plant furnace desulfurized coal ash and the mixture of the mirabilite gypsum and the cement are put into a granulator for granulation, so that the secondary utilization of the industrial gypsum is realized, the resource is saved, and the environment is protected.

The purpose of the invention can be achieved by adopting the following technical scheme: a method for adjusting cement performance by using multisource industrial byproduct gypsum comprises the following steps:

step 1: quantitatively weighing phosphogypsum with the water content of 10-20%, steel mill desulfurized gypsum, desulfurized coal ash residue in a power plant furnace and mirabilite gypsum; the total weight of the weighed multisource gypsum accounts for 70-95%, and the cement accounts for 5-30%;

step 2: putting phosphogypsum, steel plant desulfurized gypsum, desulfurized coal ash in a power plant furnace and mirabilite gypsum into a crusher for crushing;

and step 3: putting the crushed phosphogypsum, steel plant desulfurized gypsum, desulfurized coal ash in a power plant furnace and mirabilite gypsum into a stirrer and stirring for 10-20 min;

and 4, step 4: putting the cement into a stirrer, heating to 40-60 ℃, adding soft water into the stirrer, and stirring for 2-3 h;

and 5: filtering and dehydrating the mixture of the stirred phosphogypsum, the desulfurized gypsum of the steel plant, the desulfurized coal ash in the furnace of the power plant and the mirabilite gypsum and the cement;

step 6: air-drying and airing the mixture of the filtered and dehydrated phosphogypsum, the desulfurized gypsum of a steel mill, desulfurized coal ash in a power plant furnace and mirabilite gypsum and cement;

and 7: putting the phosphogypsum, the desulfurized gypsum of the steel plant, the desulfurized coal ash in the power plant furnace and the mixture of the mirabilite gypsum and the cement into a granulator for granulation.

Preferably, the step 1 is carried out by adopting an electronic weighing mode, and phosphogypsum, steel plant desulfurization gypsum, desulfurization coal ash in a power plant furnace and mirabilite gypsum are mixed in a ratio of 1:2:1: 2.

Preferably, in the step 2, after the phosphogypsum, the steel mill desulfurized gypsum, the power plant furnace desulfurized coal ash and the mirabilite gypsum are crushed, soft water is put into the crusher for washing, and the washed mixture is put into the stirrer.

Preferably, the rotation speed of the stirrer in the step 3 is 300-.

Preferably, step 5 is carried out by pouring into a high-speed centrifugal machine for spin-drying.

Preferably, the step 6 adopts natural air drying when airing.

Preferably, a twin screw granulator is used for granulation in step 7. The invention has the beneficial technical effects that: quantitatively weighing phosphogypsum with the water content of 10-20%, steel mill desulfurized gypsum, desulfurized coal ash residue in a power plant furnace and mirabilite gypsum; the total weight of the weighed multisource gypsum accounts for 70-95%, and the cement accounts for 5-30%; putting phosphogypsum, steel plant desulfurized gypsum, desulfurized coal ash in a power plant furnace and mirabilite gypsum into a crusher for crushing; putting the crushed phosphogypsum, steel plant desulfurized gypsum, desulfurized coal ash in a power plant furnace and mirabilite gypsum into a stirrer and stirring for 10-20 min; putting the cement into a stirrer, heating to 40-60 ℃, adding soft water into the stirrer, and stirring for 2-3 h; filtering and dehydrating the mixture of the stirred phosphogypsum, the desulfurized gypsum of the steel plant, the desulfurized coal ash in the furnace of the power plant and the mirabilite gypsum and the cement; air-drying and airing the mixture of the filtered and dehydrated phosphogypsum, the desulfurized gypsum of a steel mill, desulfurized coal ash in a power plant furnace and mirabilite gypsum and cement; the phosphogypsum, the steel mill desulfurized gypsum, the power plant furnace desulfurized coal ash and the mixture of the mirabilite gypsum and the cement are put into a granulator for granulation, so that the secondary utilization of the industrial gypsum is realized, the resource is saved, and the environment is protected.

Detailed Description

In order to make the technical solutions of the present invention more clear and definite for those skilled in the art, the present invention is further described in detail with reference to the following examples, but the embodiments of the present invention are not limited thereto.

The method for adjusting the performance of the cement by using the multisource industrial byproduct gypsum provided by the embodiment comprises the following steps:

step 1: quantitatively weighing phosphogypsum with the water content of 10-20%, steel mill desulfurized gypsum, desulfurized coal ash residue in a power plant furnace and mirabilite gypsum; the total weight of the weighed multisource gypsum accounts for 70-95%, and the cement accounts for 5-30%;

step 2: putting phosphogypsum, steel plant desulfurized gypsum, desulfurized coal ash in a power plant furnace and mirabilite gypsum into a crusher for crushing;

and step 3: putting the crushed phosphogypsum, steel plant desulfurized gypsum, desulfurized coal ash in a power plant furnace and mirabilite gypsum into a stirrer and stirring for 10-20 min;

and 4, step 4: putting the cement into a stirrer, heating to 40-60 ℃, adding soft water into the stirrer, and stirring for 2-3 h;

and 5: filtering and dehydrating the mixture of the stirred phosphogypsum, the desulfurized gypsum of the steel plant, the desulfurized coal ash in the furnace of the power plant and the mirabilite gypsum and the cement;

step 6: air-drying and airing the mixture of the filtered and dehydrated phosphogypsum, the desulfurized gypsum of a steel mill, desulfurized coal ash in a power plant furnace and mirabilite gypsum and cement;

and 7: putting the phosphogypsum, the desulfurized gypsum of the steel plant, the desulfurized coal ash in the power plant furnace and the mixture of the mirabilite gypsum and the cement into a granulator for granulation.

In the embodiment, the electronic weighing method is adopted in the step 1 for weighing, and the phosphogypsum, the steel mill desulfurized gypsum, the power plant in-furnace desulfurized coal ash and the mirabilite gypsum are mixed in a ratio of 1:2:1: 2.

In this example, in step 2, after the phosphogypsum, the steel mill desulfurized gypsum, the power plant furnace desulfurized coal ash and the mirabilite gypsum are crushed, the crusher is thrown with soft water for washing, and the washed mixture is thrown into the mixer.

In this embodiment, the rotation speed of the stirrer in step 3 is 300-.

In the embodiment, step 5 is carried out by pouring into a high-speed centrifugal machine for spin-drying.

In this embodiment, natural air drying is adopted in the step 6 when air drying is performed.

In this example, a twin screw granulator is used for granulation in step 7.

The above description is only for the purpose of illustrating the present invention and is not intended to limit the scope of the present invention, and any person skilled in the art can substitute or change the technical solution of the present invention and its conception within the scope of the present invention.