阅读说明：本技术 一种电厂石膏不同工况对成份改变的工艺技术 (Process technology for changing components of gypsum in power plant under different working conditions ) 是由 邹波 潘波 汤戈 于 2019-11-14 设计创作，主要内容包括：本发明涉及电厂石膏技术领域,且公开了一种电厂石膏不同工况对成份改变的工艺技术,包括以下步骤：将10-30份电厂石膏与100份水同时加入到搅拌设备中搅拌10-20分钟,得到浆料A。该电厂石膏不同工况对成份改变的工艺技术,通过将电厂石膏与水混合搅拌,并经过振动筛筛选,使难溶于水的大颗粒杂质能够完全被过滤掉,通过助晶添加剂的设置,可以帮助浆料中的电厂石膏快速结晶,而通过表面活性剂的添加,可以借助其优异的洗涤、去污和乳化功能,配合反应釜进行水热压反应,将电厂石膏外附着的污渍进行分离,得到完整且无杂质的石膏晶粒,此方法得到的电厂石膏杂质几乎全部被清除,生产的水泥强度也得到很大提升,达到高强度和低杂质目的。(The invention relates to the technical field of gypsum in power plants, and discloses a process technology for changing components of gypsum in a power plant under different working conditions, which comprises the following steps: adding 10-30 parts of power plant gypsum and 100 parts of water into stirring equipment at the same time, and stirring for 10-20 minutes to obtain slurry A. This process technology of different operating modes of power plant gypsum to composition change, through mixing power plant gypsum and water and stirring, and through the shale shaker screening, make the large granule impurity of being difficult to water can be filtered completely, through the setting of crystallization-promoting additive, can help the quick crystallization of power plant gypsum in the thick liquids, and through the addition of surfactant, can be with the help of its excellent washing, decontamination and emulsification function, the cooperation reation kettle carries out hydrothermal pressure reaction, separate the outer adnexed spot of power plant gypsum, obtain complete and impurity-free gypsum crystalline grain, the power plant gypsum impurity that this method obtained is almost all clear away, the cement intensity of production also obtains very big promotion, reach high strength and low impurity purpose.)

1. A process technology for changing components of gypsum in a power plant under different working conditions is characterized in that: the method comprises the following steps:

1) adding 10-30 parts of power plant gypsum and 100 parts of water into stirring equipment at the same time, and stirring for 10-20 minutes to obtain slurry A;

2) filtering the slurry A in the step 1) by a vibrating screen with 200-300 meshes to remove impurities with larger particles to obtain slurry B;

3) adding 15-25 parts of the slurry B obtained in the step 2) into the acidic mixed solution, and stirring for 5-15 minutes to ensure that the pH value is less than 7 to obtain slurry C;

4) adding 100-300 parts of the slurry C obtained in the step 3) into 5-15 parts of a crystallization-promoting additive and 20-60 parts of a surfactant for mixing, adding the mixed liquid into a reaction kettle for hydrothermal pressure reaction for 1-3 hours to obtain a mixed liquid A;

5) transferring the mixed solution A in the step 4 out of the reaction kettle, naturally cooling and standing for 3-5 hours to fully grow gypsum crystal grains, adding clear water to stir, standing for layering and removing upper-layer turbid liquid, and repeating the operation for 6-10 times to obtain a material;

5) filtering the material A in the step 5) through filter cloth to filter small particle impurities to obtain final slurry, and drying the slurry for 1-3 hours to prepare powder to obtain power plant gypsum powder subjected to impurity removal;

6) grinding 30-50 parts of portland cement clinker, 2-10 parts of limestone, 10-30 parts of slag, 10-30 parts of coarse powder coal ash, 2-10 parts of boiler bottom slag and 2-10 parts of fluidized bed furnace slag into powder, adding an A-type additive into the portland cement clinker, adding a B-type additive into the power plant gypsum powder and limestone in the step 5), adding a C-type additive into the slag, adding a D-type additive into the coarse powder coal ash, the boiler bottom slag and the fluidized bed furnace slag, uniformly mixing all the components, and standing to obtain the cement.

2. The process technology for changing components of the power plant gypsum according to claim 1, which is characterized in that: the acidic mixed solution in the step 3) is one or more than two of sulfuric acid, hydrochloric acid or nitric acid, and the pressure of the hot water pressing reaction in the step 4) is 0.6 MPa.

3. The process technology for changing components of the power plant gypsum according to claim 1, which is characterized in that: the equipment used in the hydrothermal pressure reaction in the step 4) is a high-pressure reaction kettle with a stirring rod, and the temperature of the reaction kettle is 120 ℃ and 160 ℃.

4. The process technology for changing components of the power plant gypsum according to claim 1, which is characterized in that: the crystallization assistant agent is one or two of aluminum sulfate, aluminum chloride, aluminum nitrate and sodium chloride, and the surfactant is one or two of sodium dodecyl sulfate, sodium dodecyl benzene sulfonate, cetyl trimethyl ammonium bromide and glycol.

5. The process technology for changing components of the power plant gypsum according to claim 1, which is characterized in that: and (3) dewatering by using a centrifuge as a water filtering machine related in the step 5), and filtering cloth with 180-300 meshes is adopted during water filtering.

6. The process technology for changing components of the power plant gypsum according to claim 1, which is characterized in that: the additive is characterized in that the A-type additive is triethanolamine, the B-type additive is a mixture of methyl cellulose ether and lignosulfonate, the C-type additive is a polycarboxylic acid liquid high-efficiency water reducing agent, and the D-type additive is a mixture of active lime, calcium formate and calcium acetate.

Technical Field

The invention relates to the technical field of gypsum in power plants, in particular to a process technology for changing components of gypsum in a power plant under different working conditions.

Background

The gypsum of the power plant is dihydrate calcium sulfate generated by oxidizing sulfur dioxide in coal-fired flue gas after reacting with calcium hydroxide serving as a desulfurizing agent, also called desulfurized gypsum, and can be generally used for replacing natural gypsum to produce cement.

The existing power plant gypsum production processes are different, for example, Chinese patent CN 103274615B discloses a desulfurization gypsum drying and calcining production process, the invention combines two devices of a drying process and a calcining process together, thereby eliminating the problems of transferring and storing intermediate products, saving space, avoiding environmental pollution caused by the intermediate products, simultaneously, an induced draft fan leads the calcining exhaust gas in a calcining roller to the drying roller as a heat source for drying the desulfurization gypsum, the exhaust gas is recycled, saving resources, however, the power plant gypsum contains a lot of impurities such as heavy metal, dust, clay, ferric salt and the like when just leaving the factory, the invention starts dehydration and calcination only simply carries out dust removal treatment, the obtained power plant gypsum impurities are too much, if the invention is used for replacing natural gypsum to produce cement, the obtained cement has lower compression resistance, folding resistance, strength and the like, the quality is obviously too low.

Disclosure of Invention

Technical problem to be solved

Aiming at the defects of the prior art, the invention provides a process technology for changing components of gypsum in a power plant under different working conditions, which has the advantages of high strength, low impurities and the like, and solves the problems that the gypsum in the power plant is too much because dehydration and calcination are started just by simply carrying out dust removal treatment, and the obtained cement has lower compression resistance, bending resistance, strength and the like and obviously has too low quality if the gypsum is used for replacing natural gypsum to produce cement.

(II) technical scheme

In order to achieve the purposes of high strength and low impurity content, the invention provides the following technical scheme: a process technology for changing components of gypsum in a power plant under different working conditions comprises the following steps:

1) adding 10-30 parts of power plant gypsum and 100 parts of water into stirring equipment at the same time, and stirring for 10-20 minutes to obtain slurry A;

2) filtering the slurry A in the step 1) by a vibrating screen with 200-300 meshes to remove impurities with larger particles to obtain slurry B;

3) adding 15-25 parts of the slurry B obtained in the step 2) into the acidic mixed solution, and stirring for 5-15 minutes to ensure that the pH value is less than 7 to obtain slurry C;

4) adding 100-300 parts of the slurry C obtained in the step 3) into 5-15 parts of a crystallization-promoting additive and 20-60 parts of a surfactant for mixing, adding the mixed liquid into a reaction kettle for hydrothermal pressure reaction for 1-3 hours to obtain a mixed liquid A;

5) transferring the mixed solution A in the step 4 out of the reaction kettle, naturally cooling and standing for 3-5 hours to fully grow gypsum crystal grains, adding clear water to stir, standing for layering and removing upper-layer turbid liquid, and repeating the operation for 6-10 times to obtain a material;

5) filtering the material A in the step 5) through filter cloth to filter small particle impurities to obtain final slurry, and drying the slurry for 1-3 hours to prepare powder to obtain power plant gypsum powder subjected to impurity removal;

6) grinding 30-50 parts of portland cement clinker, 2-10 parts of limestone, 10-30 parts of slag, 10-30 parts of coarse powder coal ash, 2-10 parts of boiler bottom slag and 2-10 parts of fluidized bed furnace slag into powder, adding an A-type additive into the portland cement clinker, adding a B-type additive into the power plant gypsum powder and limestone in the step 5), adding a C-type additive into the slag, adding a D-type additive into the coarse powder coal ash, the boiler bottom slag and the fluidized bed furnace slag, uniformly mixing all the components, and standing to obtain the cement.

Preferably, the acidic mixed solution in the step 3) is one or more of sulfuric acid, hydrochloric acid and nitric acid, and the pressure of the hydrothermal reaction in the step 4) is 0.6 Mpa.

Preferably, the equipment used in the hydrothermal pressure reaction in the step 4) is a high-pressure reaction kettle with a stirring rod, and the temperature of the reaction kettle is 120-160 ℃.

Preferably, the crystallization aid is one or two of aluminum sulfate, aluminum chloride, aluminum nitrate and sodium chloride, and the surfactant is one or two of sodium dodecyl sulfonate, sodium dodecyl benzene sulfonate, cetyl trimethyl ammonium bromide and ethylene glycol.

Preferably, the water filtering machine involved in the step 5) is a centrifuge for dewatering, and filter cloth with 180 meshes to 300 meshes is adopted during water filtering.

Preferably, the A-type additive is triethanolamine, the B-type additive is a mixture of methyl cellulose ether and lignosulfonate, the C-type additive is a polycarboxylic acid liquid high-efficiency water reducing agent, and the D-type additive is a mixture of active lime, calcium formate and calcium acetate.

(III) advantageous effects

Compared with the prior art, the invention provides a process technology for changing components of power plant gypsum under different working conditions, and the process technology has the following beneficial effects:

1. the process technology for changing the components of the power plant gypsum under different working conditions comprises the steps of mixing and stirring the power plant gypsum and water, screening by a vibrating screen, completely filtering large-particle impurities which are difficult to dissolve in water, adding an acid mixed solution to neutralize the slurry, helping the power plant gypsum in the slurry to crystallize rapidly by the aid of a crystallization assistant additive, adding a surfactant, performing hydrothermal pressure reaction by virtue of excellent washing, decontamination and emulsification functions of the surfactant in a reaction kettle, separating stains attached to the power plant gypsum, standing for a period of time, crystallizing the power plant gypsum under the action of the crystallization assistant additive, removing upper turbid liquid formed by other floatable impurities, filtering the remaining precipitated impurities by filter cloth to obtain complete and impurity-free gypsum crystal grains, and finally drying and grinding to prepare the power plant gypsum powder, the impurities of the power plant gypsum obtained by the method are almost completely removed, so that the method is more convenient for manufacturing cement, and compared with the common power plant gypsum containing more impurities, the strength of the produced cement is also greatly improved, and the effect of the produced cement is almost the same as that of the common gypsum.

2. The process technology for changing the components of the power plant gypsum under different working conditions comprises the steps of uniformly mixing the obtained low-impurity high-strength power plant gypsum with ground Portland cement clinker, limestone, slag, coarse coal ash, boiler bottom slag and fluidized bed furnace slag, standing to produce cement, and carrying out comparative analysis on the cement and the cement prepared from the common gypsum.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to 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 of the 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.