阅读说明：本技术 一种氢氧化钙的生产工艺 (Production process of calcium hydroxide ) 是由 尹会 纪良富 周保华 于 2021-08-05 设计创作，主要内容包括：本发明涉及一种氢氧化钙的生产工艺,属于氢氧化钙生产技术领域。本发明采用石灰石和电石渣作为生产原料,在依次经过煅烧、筛分、机选、破碎、搅拌、熟化、二次破碎、二次熟化、干燥、研磨、乳化、包装入仓十二个步骤的加工下得到标准化的乳状氢氧化钙产品；本发明解决了氢氧化钙现有的传统生产工艺利润率低的问题,提高了化工企业的利润率,为化工企业的长期发展提供了帮助。(The invention relates to a production process of calcium hydroxide, belonging to the technical field of calcium hydroxide production. The invention adopts limestone and carbide slag as production raw materials, and obtains a standardized milky calcium hydroxide product by sequentially processing the raw materials through twelve steps of calcining, screening, mechanical separation, crushing, stirring, curing, secondary crushing, secondary curing, drying, grinding, emulsifying, packaging and warehousing; the invention solves the problem of low profit rate of the existing traditional production process of calcium hydroxide, improves the profit rate of chemical enterprises, and provides help for the long-term development of the chemical enterprises.)

1. The production process of calcium hydroxide is characterized by comprising the following specific steps:

the method comprises the following steps: calcining, namely, mixing limestone with calcium carbonate content not less than 95% and anthracite raw materials according to the mass ratio of 1: 0.058-1: 0.12, uniformly mixing and calcining to obtain a product calcium oxide;

step two: screening, namely removing impurities in coal ash in the product calcium oxide by screening;

step three: selecting by a machine, namely removing residual calcium carbonate impurities from the screened calcium oxide by an infrared machine;

step four: crushing, namely putting the obtained calcium oxide into a crusher to perform crushing operation to obtain powdery calcium oxide;

step five: stirring, namely selecting carbide slag with the water content of 15-35 wt% and powdery calcium oxide to stir in a stirrer according to the mass ratio of 1: 0.5-1: 1, wherein the stirring time is 15-60 min;

step six: curing, namely putting the stirred mixed material into a curing tank for preliminary curing reaction, wherein the reaction temperature is set to be 40-75 ℃, and the reaction time is set to be 20-90 min;

step seven: carrying out secondary crushing, namely carrying out secondary crushing on the cured material in a crusher;

step eight: secondary curing, namely putting the secondarily crushed material into a curing tank again for secondary curing, wherein the curing temperature is set to be 25-50 ℃, and the curing time is set to be 1-6 h, so as to obtain calcium hydroxide coarse material;

step nine: drying, namely drying the calcium hydroxide coarse material by a dryer;

step ten: grinding, namely adding the dried calcium hydroxide coarse material into a grinder for grinding operation to obtain powdery calcium hydroxide;

step eleven: adding water and powdery calcium hydroxide into an emulsification tank according to the mass ratio of 1: 1.5-1: 2.0, stirring at a constant speed for 1-3 h in the emulsification tank by using a stirrer, and standing for 12-24 h after stirring to obtain milky calcium hydroxide;

step twelve: packing and warehousing, and packing and warehousing the milky calcium hydroxide.

2. The process for producing calcium hydroxide according to claim 1, wherein: the mass ratio of the limestone to the anthracite is 1: 0.058.

3. The process for producing calcium hydroxide according to claim 1, wherein: the stirrer is a double-shaft stirrer, and the stirring time in the fifth step is 15 min.

4. The process for producing calcium hydroxide according to claim 1, wherein: the grinder is a double-disc grinder.

5. The process for producing calcium hydroxide according to claim 1, wherein: the water content of the carbide slag is 25 wt%.

6. The process for producing calcium hydroxide according to claim 1, wherein: the step shows that the mass ratio of the water to the powdery calcium hydroxide is 1: 1.5.

7. The process for producing calcium hydroxide according to claim 1, wherein: the temperature of the aging tank for preliminary aging in the sixth step was set to 45 ℃.

Technical Field

The invention relates to the technical field of calcium hydroxide production, in particular to a production process of calcium hydroxide.

Background

Calcium hydroxide is an inorganic compound of the formula Ca (OH)2, commonly known as slaked or slaked lime; calcium hydroxide has wide application in industry. Calcium hydroxide is obtained by reacting calcium oxide with water, at present, most factories generally adopt quicklime to produce calcium hydroxide, and the main production process is generally a dry method and a wet method.

At present, a plurality of manufacturers for producing calcium hydroxide have fierce market competition, the profit of producing calcium hydroxide by using quick lime is small, and the increase demand of enterprise operation cannot be met by insisting on producing calcium hydroxide by using quick lime; with the continuous trend of strict environmental protection policy, many enterprises producing waste materials can not carry out any treatment on the production waste materials, and the waste materials are utilized to reproduce the profit space, so that the waste residues of the carbide slag can be produced in the acetylene production, the main component of the carbide slag is calcium hydroxide, and the production of the calcium hydroxide by the carbide slag has obvious cost advantage; in addition, in recent years, the attention of various local governments on sewage treatment is continuously improved, calcium hydroxide has a large market space as a common sewage treatment agent, and the milky calcium hydroxide obtained by deep processing of calcium hydroxide is widely used due to good sewage treatment effect and no secondary pollution; in conclusion, the production of milky calcium hydroxide by using carbide slag is a great transformation opportunity for chemical enterprises, so it is necessary to develop a process for producing milky calcium hydroxide by using carbide slag.

Disclosure of Invention

Aiming at the problems of defects and deficiencies in the prior art, the invention provides a production process of calcium hydroxide, which solves the problem of low profit rate of the existing traditional production process of calcium hydroxide, improves the profit rate of chemical enterprises, and provides help for long-term development of the chemical enterprises.

The technical scheme adopted by the invention for solving the technical problems is as follows:

a production process of calcium hydroxide comprises the following specific steps:

the method comprises the following steps: calcining, namely, mixing limestone with calcium carbonate content not less than 95% and anthracite raw materials according to the mass ratio of 1: 0.058-1: 0.12, uniformly mixing and calcining to obtain a product calcium oxide;

step two: screening, namely removing impurities in coal ash in the product calcium oxide by screening;

step three: selecting by a machine, namely removing residual calcium carbonate impurities from the screened calcium oxide by an infrared machine;

step four: crushing, namely putting the obtained calcium oxide into a crusher to perform crushing operation to obtain powdery calcium oxide;

step five: stirring, namely selecting carbide slag with the water content of 15-35 wt% and powdery calcium oxide to stir in a stirrer according to the mass ratio of 1: 0.5-1: 1, wherein the stirring time is 15-60 min;

step six: curing, namely putting the stirred mixed material into a curing tank for preliminary curing reaction, wherein the reaction temperature is set to be 40-75 ℃, and the reaction time is set to be 20-90 min;

step seven: carrying out secondary crushing, namely carrying out secondary crushing on the cured material in a crusher;

step eight: secondary curing, namely putting the secondarily crushed material into a curing tank again for secondary curing, wherein the curing temperature is set to be 25-50 ℃, and the curing time is set to be 1-6 h, so as to obtain calcium hydroxide coarse material;

step nine: drying, namely drying the calcium hydroxide coarse material by a dryer;

step ten: grinding, namely adding the dried calcium hydroxide coarse material into a grinder for grinding operation to obtain powdery calcium hydroxide;

step eleven: adding water and powdery calcium hydroxide into an emulsification tank according to the mass ratio of 1: 1.5-1: 2.0, stirring at a constant speed for 1-3 h in the emulsification tank by using a stirrer, and standing for 12-24 h after stirring to obtain milky calcium hydroxide;

step twelve: packing and warehousing, and packing and warehousing the milky calcium hydroxide.

Furthermore, the mass ratio of the limestone to the anthracite is 1: 0.058.

Further, the stirrer is a double-shaft stirrer, and the stirring time in the fifth step is 15 min.

Further, the grinder is a double-disc grinder.

Further, the water content of the carbide slag is 25 wt%.

Further, the step shows that the mass ratio of water to powdery calcium hydroxide is 1: 1.5.

Further, the temperature of the aging tank for preliminary aging in the sixth step was set to 45 ℃.

The invention has the following beneficial effects: the invention produces the product emulsified calcium hydroxide with better development prospect by using the industrial waste residue carbide slag and the limestone as raw materials, on one hand, the price of the limestone and the carbide slag is lower than that of the calcium oxide raw materials, thereby reducing the production cost of the raw materials, and on the other hand, the market space of the emulsified calcium hydroxide is large, thereby having development prospect, thereby improving the competitive advantage of the calcium hydroxide, generally improving the profit rate of the product, and providing guarantee for enterprises to obtain advantages in market competition and for benign operation.

Drawings

FIG. 1 is a process flow diagram of the present invention.

Detailed Description

The following detailed description of embodiments of the invention refers to the accompanying drawings.

As shown in figure 1, a production process of calcium hydroxide comprises the first step of preparing limestone with 95% calcium carbonate and anthracite, mixing them according to the mass ratio of 1:0.058, uniformly mixing the limestone and anthracite, and calcining to obtain calcium oxide; secondly, screening the calcium oxide by a vibrating screen to remove impurities in the coal ash; thirdly, the screened calcium oxide is subjected to infrared ray machine selection, so that residual calcium carbonate impurities can be removed; fourthly, putting the obtained calcium oxide into a crusher for crushing operation to obtain powdery calcium oxide; fifthly, selecting the carbide slag with the water content of 25wt% and powdered calcium oxide to mix according to the mass ratio of 1:1, adding the mixed materials into a stirrer to be uniformly stirred for 15 min; sixthly, putting the uniformly mixed material into a curing tank for preliminary curing reaction, wherein the reaction temperature is set to 45 ℃, and the reaction time is set to 1 h; seventhly, naturally spreading the primarily cured mixed material for cooling, and secondarily crushing the cooled mixed material by a crusher; eighthly, putting the re-crushed mixed material into a curing tank again for secondary curing, wherein the curing temperature is set to 35 ℃, the curing time is set to 3 hours, and the calcium hydroxide coarse material is obtained after the reaction is finished; ninth, drying the calcium hydroxide coarse material by a dryer; tenth, adding the dried calcium hydroxide coarse material into a grinder for grinding operation to obtain powdery calcium hydroxide; step ten, adding water and powdery calcium hydroxide into an emulsification tank according to the mass ratio of 1:1.5, stirring at a constant speed for 2 hours in the emulsification tank by using a stirrer, and standing for 24 hours after stirring to obtain milky calcium hydroxide; and step ten, packaging the milky calcium hydroxide and putting the milky calcium hydroxide into a warehouse.

The invention has the following beneficial effects: the invention produces the product emulsified calcium hydroxide with better development prospect by using the industrial waste residue carbide slag and the limestone as raw materials, on one hand, the price of the limestone and the carbide slag is lower than that of the calcium oxide raw materials, thereby reducing the production cost of the raw materials, and on the other hand, the market space of the emulsified calcium hydroxide is large, thereby having development prospect, thereby improving the competitive advantage of the calcium hydroxide, generally improving the profit rate of the product, and providing guarantee for enterprises to obtain advantages in market competition and for benign operation.

The foregoing shows and describes the general principles, essential features, and advantages of the invention. The present invention is not limited to the above-described embodiments, which are described in the specification and illustrated only for illustrating the principle of the present invention, but various changes and modifications may be made within the scope of the present invention as claimed without departing from the spirit and scope of the present invention. The scope of the invention is defined by the appended claims and equivalents thereof.