CN112125537B - Industrial preparation technology of calcium hydroxide - Google Patents
Industrial preparation technology of calcium hydroxide Download PDFInfo
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- CN112125537B CN112125537B CN202011041917.8A CN202011041917A CN112125537B CN 112125537 B CN112125537 B CN 112125537B CN 202011041917 A CN202011041917 A CN 202011041917A CN 112125537 B CN112125537 B CN 112125537B
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- calcium hydroxide
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2/00—Lime, magnesia or dolomite
- C04B2/02—Lime
- C04B2/04—Slaking
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2/00—Lime, magnesia or dolomite
- C04B2/02—Lime
- C04B2/04—Slaking
- C04B2/045—After-treatment of slaked lime
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The invention relates to a calcium hydroxide industrial preparation technology, which comprises the following steps: step 1, taking carbide slag and quicklime, and respectively preprocessing; step 2, putting the pretreated carbide slag and the calcined lime with the process mass ratio of 1.5:1 into a mixer, and carrying out primary stirring to obtain a primary mixture; step 3, putting the primary mixture into a primary digester, digesting, and then carrying out primary screening to obtain a primary product; step 4, putting the primary product into a secondary digester, performing secondary digestion, and then performing secondary screening; step 5, putting the solid matter after the secondary screening into a sorting and sorting machine, and carrying out three-stage screening to obtain a finished product; according to the industrial preparation technology of calcium hydroxide, the carbide slag is used as the raw material, the production cost is reduced, waste is turned into wealth, the content of calcium hydroxide in the obtained product is up to 95% through detection, the purity is high, and the content of acid insoluble substances and alkali metals is low.
Description
Technical Field
The invention relates to the technical field of industrial calcium hydroxide preparation, in particular to an industrial calcium hydroxide preparation technology.
Background
The carbide slag is mainly produced from polyvinyl chloride and vinyl acetate, about 1.45 tons of calcium carbide is consumed for producing 1 ton of polyvinyl chloride, 1 ton of carbide slag is produced after hydrolyzing each ton of calcium carbide, the carbide slag has large quantity, high alkali content and contains harmful substances such as sulfur, arsenic and the like, the carbide slag can block a sewer and block a river bed without being treated and discharged, the production of fishery is damaged, the carbide slag is stacked on land, the land occupies land and pollutes the environment, and the carbide slag has serious erosion effect on the land, so that the treatment of the carbide slag becomes a great problem, the technical breakthrough is realized, a new treatment process is sought, the comprehensive utilization is realized, the harm is turned into the benefit, the waste is changed into the valuable, and the carbide slag is one of the major hot subjects studied by experts and enterprises, at present, under the attack of experts and enterprises, the carbide slag can replace lime to prepare cement, produce quicklime to be used as a raw material for calcium carbide, produce chemical products, produce building materials, treat the environment and the like, the main component of the carbide slag is calcium hydroxide, and the carbide slag can be used for industrial production of calcium hydroxide.
Calcium hydroxide is a white powdery solid of formula Ca (OH)2The calcium hydroxide is a binary strong base and can only be slightly dissolved in water, and the calcium hydroxide has wide application in industry.
Calcium hydroxide is mainly used for environmental protection neutralizers, acidic wastewater, sewage treatment, boiler flue gas desulfurization, house construction and the like, for example, calcium hydroxide is used for reducing soil acidity, improving soil structure and preparing pesticide Bordeaux mixture which is prepared by using lime milk and copper sulfate aqueous solution according to a certain proportion; the calcium hydroxide is used for flue gas desulfurization, and is mainly used for neutralizing acid gases such as sulfur dioxide, sulfur trioxide and a small part of fluoride ion chloride ions, so that the sulfur content of the discharged flue gas meets the environmental protection standard.
The existing industrial production of calcium hydroxide has the advantages that the purity of the produced calcium hydroxide is low, the content of alkali metal and acid insoluble substances is high, the requirements cannot be met, particularly, the calcium hydroxide is produced in the fields with high purity requirements, such as the fields of food and medicine, and most of the calcium hydroxide is directly digested by single quicklime, so that the production cost is high, and accordingly, an industrial preparation technology of the calcium hydroxide is provided.
Disclosure of Invention
The invention aims to provide an industrial preparation technology of calcium hydroxide, which aims to solve the problems that in the prior art, the purity of the produced calcium hydroxide is low, the content of alkali metal and acid insoluble substances is high, the requirements cannot be met, most calcium hydroxide is produced directly by single quicklime digestion, and the production cost is high in the industrial production of the calcium hydroxide.
In order to achieve the purpose, the invention provides the following technical scheme: an industrial preparation technology of calcium hydroxide comprises the following steps:
(1) taking carbide slag and quicklime, and respectively pretreating;
(2) putting the pretreated carbide slag and the calcined lime with the process mass ratio of 1.5:1 into a mixer through a belt scale, and carrying out primary stirring to obtain a primary mixture;
(3) putting the primary mixture into a primary digester, putting a certain amount of deionized water into the primary digester to enable the mass ratio of solid matters to water to be 1:5, heating, digesting, and then carrying out primary screening to remove impurities to obtain a primary product;
(4) putting the primary product into a secondary digester, keeping the mass ratio of solid substances to deionized water in the secondary digester at 1:5, heating, carrying out secondary digestion, volatilizing water after digestion to obtain solid substances, and then carrying out secondary screening to remove impurities, unreacted carbide slag and quicklime;
(5) and (4) putting the solid matter after the secondary screening into a sorting and sorting machine, carrying out three-stage screening, and further removing impurities, unreacted carbide slag and quicklime to obtain a finished product.
Preferably, the carbide slag is pretreated, and the quicklime is prepared by selecting a limestone raw material, crushing the limestone raw material to obtain a crushed limestone with the particle size of 60-150 mm, cleaning the crushed limestone with a rotary drum stone washer, ultrasonically cleaning the crushed limestone, drying the crushed limestone, and calcining the crushed, cleaned and dried limestone at the calcining temperature of 900-1100 ℃.
Preferably, the step of pretreating the quicklime comprises the step of crushing the quicklime again, wherein the particle size of the crushed quicklime is 2-10 mm.
Preferably, the carbide slag is pretreated by screening the carbide slag, and screening the carbide slag with the water content of about 35%.
Preferably, the digestion temperature in step (3) and step (4) is 84 ℃.
The invention has at least the following beneficial effects:
(1) according to the industrial preparation technology of calcium hydroxide, the carbide slag is used as the raw material, 15 million tons of carbide slag can be treated every year, the carbide slag has high alkali content and contains harmful substances such as sulfur, arsenic and the like, and the carbide slag is discharged without treatment, so that a sewer is blocked, a river bed is choked and accumulated, fishery production is damaged, land occupation and environment pollution are caused when the carbide slag is stacked on land, and a serious erosion effect on the land is caused.
(2) According to the industrial preparation technology of calcium hydroxide, the limestone is crushed before being calcined, the quicklime is crushed before being digested, the multistage crushing treatment is combined, the crushed particle size is strictly controlled, the full reaction is ensured, the multistage digestion is carried out during the preparation process of the calcium hydroxide, the digestion is completely carried out, and the impurities, unreacted carbide slag and the quicklime are removed through multistage screening, so that the purity of the product is ensured.
(3) According to the industrial preparation technology of calcium hydroxide, the mass ratio of the digested carbide slag to the quicklime to the deionized water is controlled to be 1:5, and in the prior art, the ratio is generally 1:3, so that a reaction product is viscous, the fluidity of an aqueous solution is poor, and the continuous reaction is not facilitated.
(4) According to the product obtained by the industrial preparation technology of the calcium hydroxide, the content of the calcium hydroxide in the product is up to 95 percent through detection, the purity is high, and the contents of acid insoluble substances and alkali metals are low.
Detailed Description
The technical solutions in the embodiments of the present invention are clearly and completely described below, 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.
Examples
An industrial preparation technology of calcium hydroxide comprises the following steps:
(1) selecting a limestone raw material, crushing the limestone raw material by a jaw crusher to obtain crushed limestone with the particle size of 60-150 mm, primarily cleaning the limestone raw material by a rotary drum stone washer, attaching a layer of water film to the surface of the cleaned limestone, then removing the water film by ultrasonic cleaning, and finally drying the cleaned limestone at the drying temperature of 200-300 ℃;
(2) calcining the crushed and cleaned limestone at 900-1100 ℃ to obtain the quicklime, wherein the reaction route is as follows:
CaCO3→CaO+CO2↑
(3) crushing the obtained quicklime again, wherein the crushing particle size is 2-10 mm;
(4) screening the carbide slag, wherein the carbide slag with the water content of about 35 percent is screened;
(5) putting the crushed quicklime and the screened carbide slag into a mixer according to the process mass ratio of 1.5:1, and carrying out primary stirring to obtain a primary mixture;
(6) putting the primary mixture into a primary digester, putting a certain amount of deionized water into the primary digester to enable the mass ratio of solid matters to water to be 1:5, heating to 84 ℃, digesting, and then carrying out primary screening to remove impurities to obtain a primary product;
(7) putting the primary product into a secondary digester, keeping the mass ratio of solid matters to deionized water in the secondary digester at 1:5, heating to 84 ℃, carrying out secondary digestion, volatilizing water after digestion to obtain solid matters, and then carrying out secondary screening to remove impurities, unreacted carbide slag and quicklime;
(8) and (4) putting the solid matter after the secondary screening into a sorting and sorting machine, carrying out three-stage screening, and further removing impurities, unreacted carbide slag and quicklime to obtain a finished product.
Wherein, the content of each component in the calcium hydroxide powder is determined according to the relevant regulations in HG/T4120-2009 industrial calcium hydroxide, and the determination results are shown in Table 1:
TABLE 1 calcium hydroxide powder content
As shown in the table above, the determination method and standard of the content of each component in the calcium hydroxide powder are according to the relevant regulations in HG/T4120-2009 industrial calcium hydroxide, and the calcium hydroxide in the calcium hydroxide powder prepared by the invention has the content of calcium hydroxide as high as 95%, high purity, no heavy metal hazard, and low content of acid insoluble substances and alkaline metals.
While there have been shown and described what are at present considered the fundamental principles and essential features of the invention and its advantages, it will be apparent to those skilled in the art that the invention is not limited to the details of the foregoing exemplary embodiments, but is capable of other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (5)
1. An industrial preparation technology of calcium hydroxide is characterized by comprising the following steps:
(1) taking carbide slag and quicklime, and respectively pretreating;
(2) putting the pretreated carbide slag and the calcined lime with the process mass ratio of 1.5:1 into a mixer through a belt scale, and carrying out primary stirring to obtain a primary mixture;
(3) putting the primary mixture into a primary digester, putting a certain amount of deionized water into the primary digester to enable the mass ratio of solid matters to water to be 1:5, heating, digesting, and then carrying out primary screening to remove impurities to obtain a primary product;
(4) putting the primary product into a secondary digester, keeping the mass ratio of solid substances to deionized water in the secondary digester at 1:5, heating, carrying out secondary digestion, volatilizing water after digestion to obtain solid substances, and then carrying out secondary screening to remove impurities, unreacted carbide slag and quicklime;
(5) and (4) putting the solid matter after the secondary screening into a sorting and sorting machine, carrying out three-stage screening, and further removing impurities, unreacted carbide slag and quicklime to obtain a finished product.
2. The industrial preparation technology of calcium hydroxide according to claim 1, characterized in that: the preparation process of the quick lime comprises the steps of selecting a limestone raw material, carrying out crushing treatment, cleaning the crushed limestone with a rotary drum stone washer, carrying out ultrasonic cleaning and drying, calcining the crushed, cleaned and dried limestone at the calcining temperature of 900-1100 ℃ to obtain the quick lime, wherein the particle size of the crushed limestone is 60-150 mm.
3. The industrial preparation technology of calcium hydroxide according to claim 1, characterized in that: and the step of pretreating the quicklime comprises the step of crushing the quicklime again, wherein the particle size of the crushed quicklime is 2-10 mm.
4. The industrial preparation technology of calcium hydroxide according to claim 1, characterized in that: the carbide slag pretreatment step comprises the steps of screening the carbide slag and screening the carbide slag with the water content of about 35%.
5. The industrial preparation technology of calcium hydroxide according to claim 1, characterized in that: the digestion temperature in step (3) and step (4) was 84 ℃.
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| CN113772705A (en) * | 2021-11-11 | 2021-12-10 | 河南圣恒智能装备科技有限公司 | Production system and production process for preparing calcium hydroxide by dewatering carbide slag |
| CN114956609B (en) * | 2022-06-21 | 2023-04-25 | 安徽前江超细粉末科技有限公司 | Low-cost calcium hydroxide suspension and preparation method thereof |
| CN115286265A (en) * | 2022-08-05 | 2022-11-04 | 廖怀武 | Production method for producing calcium hydroxide by using waste carbide slag |
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| GB520829A (en) * | 1937-09-27 | 1940-05-06 | Stickstoffduenger Ag | Manufacture of sintered calcium oxide |
| JPS54110912A (en) * | 1978-02-21 | 1979-08-30 | Kobe Steel Ltd | Treatment of refining additive |
| CN101648723A (en) * | 2008-08-13 | 2010-02-17 | 徐铭 | Method for producing precipitated calcium carbonate |
| CN101898083B (en) * | 2010-07-30 | 2012-09-26 | 福建龙净脱硫脱硝工程有限公司 | Method and device for preparing dry desulfurizing agent by using carbide slag |
| CN108911535B (en) * | 2018-07-04 | 2020-11-17 | 衢州市远方化工厂（普通合伙） | Preparation process of high-activity anti-coagulation calcium hydroxide |
| CN109704601B (en) * | 2019-02-15 | 2021-03-26 | 四川和临科技发展有限公司 | Lime slaking process for producing nano-scale calcium hydroxide |
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