阅读说明：本技术 一种脱硫熟石膏加工工艺 (Desulfurization calcined gypsum processing technology ) 是由 梁冠三 于 2020-07-13 设计创作，主要内容包括：本发明提供一种脱硫熟石膏加工工艺,涉及石膏加工技术领域。该脱硫熟石膏加工工艺,包括以下步骤：S1、准备足量的石灰石,将石灰石置于粉碎设备中粉碎处理,得到石灰石粉末,往得到的石灰石粉末中加入足量的清水,搅拌均匀后制成浆液；S2、将上述制成的浆液泵送入反应塔中,同时往吸收塔中通入二氧化硫气体,并且从反应塔下部鼓入的空气。本发明,脱硫熟石膏加工工艺中,首先对原料进行粉碎,不仅方便制成浆液,而且也可让浆液与二氧化硫充分反应,同时往吸收塔中通入二氧化硫,减少了其它杂质的存在,提高了制备的石膏纯度,合理优化了脱硫熟石膏的加工工艺,提高了脱硫熟石膏的加工效率。(The invention provides a desulfurization calcined gypsum processing technology, and relates to the technical field of gypsum processing. The processing technology of the desulfurized calcined gypsum comprises the following steps: s1, preparing enough limestone, placing the limestone into crushing equipment for crushing treatment to obtain limestone powder, adding enough clear water into the limestone powder, and stirring uniformly to prepare slurry; s2, pumping the prepared slurry into the reaction tower, introducing sulfur dioxide gas into the absorption tower, and blowing air from the lower part of the reaction tower. According to the invention, in the desulfurization calcined gypsum processing technology, the raw materials are firstly crushed, so that not only is the slurry conveniently prepared, but also the slurry can fully react with sulfur dioxide, and meanwhile, sulfur dioxide is introduced into the absorption tower, so that the existence of other impurities is reduced, the purity of the prepared gypsum is improved, the processing technology of the desulfurization calcined gypsum is reasonably optimized, and the processing efficiency of the desulfurization calcined gypsum is improved.)

1. A desulfurization calcined gypsum processing technology is characterized in that: the processing technology comprises the following steps:

s1, preparing enough limestone, placing the limestone into crushing equipment for crushing treatment to obtain limestone powder, adding enough clear water into the limestone powder, and stirring uniformly to prepare slurry;

s2, pumping the prepared slurry into a reaction tower, introducing sulfur dioxide gas into the absorption tower, blowing air from the lower part of the reaction tower, carrying out oxidation reaction on the sulfur dioxide, the slurry and the air to generate calcium sulfate, and continuing to react to form gypsum slurry when the calcium sulfate reaches a certain saturation degree;

s3, discharging the obtained gypsum slurry from the reaction tower, firstly concentrating the gypsum slurry, then dehydrating the concentrated gypsum slurry, and detecting the water content of the dehydrated gypsum by using a water detector;

s4, adding the additive into the gypsum, stirring and mixing uniformly, and then taking out the gypsum added with the additive for later use;

s5, feeding the prepared gypsum through a double-screw feeder, carrying out extrusion dehydration, and then feeding the gypsum into a dryer for drying, wherein the gypsum is required to be stirred in the drying process;

s6, taking out the dried gypsum in the dryer, grinding the dried gypsum to obtain gypsum powder, then sending the gypsum powder into a calcining furnace, and calcining the gypsum powder in the calcining furnace to obtain the desulfurized calcined gypsum.

2. The desulfurization calcined gypsum processing technology of claim 1, which is characterized in that: the time of the crushing treatment in the step 1 is 10-20min, the crushing speed is 1000r/min, the particle size of the limestone powder is 200 meshes in 100-15 min, and the stirring speed is 800r/min in 600-800 min.

3. The desulfurization calcined gypsum processing technology of claim 1, which is characterized in that: and in the step 3, the water content is controlled to be 5-10%.

4. The desulfurization calcined gypsum processing technology of claim 1, which is characterized in that: in the step 4, the mass ratio of the gypsum to the additive is 100: 1-2, the stirring time is 8-20min, and the stirring speed is 400-600 r/min.

5. The desulfurization calcined gypsum processing technology of claim 1, which is characterized in that: the additive consists of a coagulation regulator, an adhesive, a water reducing agent and a water-retaining agent, and the mass ratio of the coagulation regulator to the adhesive to the water reducing agent is 1: 1.1: 0.8: 1.2.

6. The desulfurization calcined gypsum processing technology of claim 5, which is characterized in that: the water-retaining agent is composed of one or more of hydroxypropyl methyl cellulose, methyl cellulose and carboxymethyl cellulose.

7. The desulfurization calcined gypsum processing technology of claim 1, which is characterized in that: in the step 5, the stirring treatment time is 20-30min, the stirring speed is 100-.

8. The desulfurization calcined gypsum processing technology of claim 1, which is characterized in that: the particle size of the gypsum powder obtained in the step 6 is 100-200 meshes, the calcining treatment time is 40-60min, and the calcining treatment temperature is 180-200 ℃.

Technical Field

The invention relates to the technical field of gypsum processing, in particular to a processing technology of desulfurized calcined gypsum.

Background

Gypsum is a monoclinic mineral and is a hydrate whose main chemical component is calcium sulfate (CaSO 4). Gypsum is a widely used industrial and building material. Can be used for cement retarders, gypsum building products, model making, medical food additives, sulfuric acid production, paper fillers, paint fillers and the like.

The gypsum building material is not only good in performance, but also green, the application of the foreign gypsum building material is wide, a modular light building system suitable for less than 8 layers is built in Europe, the building structure is built on a construction site by using a steel frame, the building structure is connected by using rivets, then the boards manufactured in factories are transported to the construction site for assembly, the building is covered by four layers in three days, the inner wall is a heat insulation board with various colors, the outer wall is provided with a rainproof waterproof board, the gypsum building materials are usually made of desulfurized plaster, at present, the use amount of the desulfurized plaster is increasingly large, however, the existing desulfurized plaster is simple in processing technology, the desulfurized plaster is low in purity and doped with more impurities, and more additives still need to be added when the desulfurized plaster is used subsequently, and certain limitation exists.

Disclosure of Invention

Technical problem to be solved

Aiming at the defects of the prior art, the invention provides a desulfurization calcined gypsum processing technology, which solves the defects and shortcomings of the prior art.

(II) technical scheme

In order to achieve the purpose, the invention is realized by the following technical scheme: a desulfurization calcined gypsum processing technology comprises the following steps:

s1, preparing enough limestone, placing the limestone into crushing equipment for crushing treatment to obtain limestone powder, adding enough clear water into the limestone powder, and stirring uniformly to prepare slurry;

s2, pumping the prepared slurry into a reaction tower, introducing sulfur dioxide gas into the absorption tower, blowing air from the lower part of the reaction tower, carrying out oxidation reaction on the sulfur dioxide, the slurry and the air to generate calcium sulfate, and continuing to react to form gypsum slurry when the calcium sulfate reaches a certain saturation degree;

s3, discharging the obtained gypsum slurry from the reaction tower, firstly concentrating the gypsum slurry, then dehydrating the concentrated gypsum slurry, and detecting the water content of the dehydrated gypsum by using a water detector;

s4, adding the additive into the gypsum, stirring and mixing uniformly, and then taking out the gypsum added with the additive for later use;

s5, feeding the prepared gypsum through a double-screw feeder, carrying out extrusion dehydration, and then feeding the gypsum into a dryer for drying, wherein the gypsum is required to be stirred in the drying process;

s6, taking out the dried gypsum in the dryer, grinding the dried gypsum to obtain gypsum powder, then sending the gypsum powder into a calcining furnace, and calcining the gypsum powder in the calcining furnace to obtain the desulfurized calcined gypsum.

Preferably, the time of the crushing treatment in the step 1 is 10-20min, the crushing speed is 800-.

Preferably, the water content is controlled to be 5% -10% in the step 3.

Preferably, the mass ratio of the gypsum to the additive in the step 4 is 100: 1-2, the stirring time is 8-20min, and the stirring speed is 400-600 r/min.

Preferably, the additive consists of a coagulation regulator, an adhesive, a water reducing agent and a water-retaining agent, and the mass ratio of the coagulation regulator to the adhesive to the water reducing agent is 1: 1.1: 0.8: 1.2.

Preferably, the water-retaining agent is composed of one or more of hydroxypropyl methylcellulose, methylcellulose and carboxymethyl cellulose.

Preferably, the stirring time in the step 5 is 20-30min, the stirring speed is 100-.

Preferably, the particle size of the gypsum powder obtained in the step 6 is 100-200 meshes, the calcination treatment time is 40-60min, and the calcination treatment temperature is 180-200 ℃.

(III) advantageous effects

The invention provides a processing technology of desulfurized calcined gypsum. The method has the following beneficial effects:

1. according to the invention, in the desulfurization calcined gypsum processing technology, the raw materials are firstly crushed, so that not only is the slurry conveniently prepared, but also the slurry can fully react with sulfur dioxide, and meanwhile, sulfur dioxide is introduced into the absorption tower, so that the existence of other impurities is reduced, the purity of the prepared gypsum is improved, the processing technology of the desulfurization calcined gypsum is reasonably optimized, and the processing efficiency of the desulfurization calcined gypsum is improved.

2. According to the invention, the coagulation regulator, the adhesive, the water reducer and the water-retaining agent are added into the gypsum, so that when the calcined gypsum is used for preparing a product, the setting time can be prolonged or shortened, the viscosity and the water retention of the gypsum can be improved, the water consumption required for mixing can be reduced, the relevant performance of the desulfurized calcined gypsum can be realized without other auxiliary agents when the desulfurized calcined gypsum is used, and the working efficiency of the operation 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.