CN101475328B - Gypsum rotating crystal excitant and use for producing construction gypsum from marine gypsum - Google Patents
Gypsum rotating crystal excitant and use for producing construction gypsum from marine gypsum Download PDFInfo
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- CN101475328B CN101475328B CN2009100677497A CN200910067749A CN101475328B CN 101475328 B CN101475328 B CN 101475328B CN 2009100677497 A CN2009100677497 A CN 2009100677497A CN 200910067749 A CN200910067749 A CN 200910067749A CN 101475328 B CN101475328 B CN 101475328B
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- gypsum
- salt
- exciting agent
- rotating crystal
- plaster
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Abstract
The invention discloses a gypsum crystal transformation excitant and application of the gypsum crystal transformation excitant in producing building gypsum from salt gypsum. The gypsum crystal transformation excitant consists of the following compositions in percentage by mass: 20 to 40 percent of potassium sulphate, 0.05 to 0.3 percent of sodium citrate, 20 to 40 percent of sodium sulfate and 20to 40 percent of sodium carbonate; the application of the gypsum crystal transformation excitant in producing the building gypsum from the salt gypsum comprises the following steps that: (1) salt gypsum slurry is separated to remove a sodium chloride aqueous solution to obtain hydrous salt gypsum; (2) the hydrous salt gypsum is added with water and the gypsum crystal transformation excitant and is subjected to crystal transformation; (3) the solution is filtered, is washed by water and is filtered to obtain dihydrate gypsum; and (4) the dihydrate gypsum is dried and calcined to obtain the building gypsum. The gypsum crystal transformation excitant is added into the salt gypsum so that the hydrous salt gypsum is transformed into the dihydrate gypsum and particles grow up; the filtering andwashing condition is improved to remarkably increase the production capacity of filtering equipment and reduce the entrainment amount of a mother solution; and the salt gypsum is transformed into thebuilding gypsum through drying and calcination.
Description
Technical field
The present invention relates to the technical field of salt industry chemical industry in the inorganic chemical engineering, more particularly, relate to a kind of gypsum rotating crystal exciting agent and the application in salt gypsum production plaster of Paris.
Background technology
Gypsum and cement, lime are listed as current three big gelling material, are used widely in construction industry.Gypsum is compared with traditional material of construction, has a lot of premium propertiess, no matter aspect save energy, soil, timber, manpower, still in environment protection, fire prevention, all leading aspect shockproof, is known as energy-saving green building material in the world.
The gypsum building products that requires according to China's wall reform will account for about 60% (only accounting for about 10% at present) of material of construction.Calculate China's gypsum demand by this and just will reach 1,600 ten thousand t; The gypsum industry of China also must have suitable development from now on for this reason, could satisfy the needs that China's economic construction and people's lives increase, and its development prospect is very wide.
China is gypsum resource big country, but also is quality poor country, and the high-quality gypsum only accounts for 8% of total reserves.Simultaneously, gypsum is Nonrenewable resources, therefore must pay attention to the recycling economy in the gypsum industry, reduces the undue use of industrial development to the gypsum Mineral resources.And utilize industrial gypsum waste residue instead of part or all natural resource, be the desirability that realizes sustainable development target.
The salt gypsum is the waste residue that produces with sulfur acid calcium raw material multiple-effect evaporation vacuum salt production processes such as subsurface brine, gypsum model rock salt hydromining halogen and seawater.Expect China's gypsum model bittern vacuum salt production throughput in 2010 and will reach more than 8,000,000 tons, and 1,000,000 tons of salt of every production produce about 20,000 tons of salt gypsum offscums simultaneously, the annual by-product gypsum waste residue of China is more than 160,000 tons for this reason.
Gypsum is usually with three kinds of different form CaSO in the multiple-effect evaporation salt-making process
42H
2O (CSD), CaSO
41/2H
2O (CSH), CaSO
4(CSA) separate out.Temperature is a dehydrated gyp-at the crystal habit more than 82 ℃ in theory; Temperature is a dihydrate gypsum at the crystal habit below 53 ℃; The crystal habit of temperature between 53 ℃～82 ℃ is then based on semi-hydrated gypsum.In fact, vacuum salt production factory is the mixture of several gypsum forms with the gypsum of mother liquor discharge at present, and major part is a dehydrated gyp-.Owing to evaporate vaporator rate height in the salt-making process, the gypsum granularity of separating out is very little, is about 4～5 μ m on the other hand, make the washing of gypsum separate very difficulty, gypsum after the separation not only water content is big, and saliferous (sodium-chlor) amount that makes gypsum can't directly be utilized up to 7～12%.Each vacuum salt production factory directly discharging had mostly at present both caused the severe contamination to surrounding environment for this reason, caused the resource significant wastage of (comprising bittern and gypsum) again.This kind salt gypsum needs can carry out effective separation and purification by exciting the commentaries on classics crystalline substance that the granularity of gypsum is increased, and could carry out processing and utilization again.And effective separation of salt gypsum, evaluation and exploration technology still are blank so far.
There is filter press technique in vacuum salt production factory, centrifugal settling method, centrifugal filtration process for the preliminary treatment method of salt gypsum at present.But various processing modes are in various degree the certain problem of existence all: the throughput as plate-and-frame filter press unit's filtration area is little, and number of devices is many, and the operational cycle is long, and labor strength is big; Though centrifugal settling method throughput is big, gypsum moisture (bittern) is up to 30%～40%, and saltiness reaches 10～12%; The water content of gypsum low (being generally about 10%) in the centrifugal filtration process, but the operational cycle of whizzer is long, and throughput is little, the power consumption height.More than the common drawback of all separate modes be that the too high levels of sodium-chlor in the salt gypsum can't be utilized, and processing cost height.Many for this reason enterprises are directly discharging in violation of rules and regulations, and band loses a large amount of mother liquors (bittern) on the one hand, causes a large amount of wastes of raw material (bittern), causes environmental pollution on the other hand.
Summary of the invention
The purpose of this invention is to provide a kind of saliferous gypsum (anhydrous calciumsulphate) that can make and be converted into dihydrate gypsum, and make its particle grow up (granularity increase), thereby improve the condition of filtering, washing, significantly improve the throughput of filter plant, reduce the amount of carrying secretly of mother liquor simultaneously, reduce the gypsum rotating crystal exciting agent of the saltiness in the gypsum.
Second purpose of the present invention provides the application of a kind of gypsum rotating crystal exciting agent in salt gypsum production plaster of Paris.
Technical scheme of the present invention is summarized as follows:
A kind of gypsum rotating crystal exciting agent is made up of following component: vitriolate of tartar 20%～40%, Trisodium Citrate 0.05%～0.3%, sodium sulfate 20%～40%, yellow soda ash 20%～40% by mass percentage.
Described vitriolate of tartar preferred 36%.
Described Trisodium Citrate preferred 0.1%.
Described sodium sulfate preferred 36%.
Described yellow soda ash preferred 28%.
The application of gypsum rotating crystal exciting agent in salt gypsum production plaster of Paris comprises the steps:
(1) the salt calcium plaster is separated obtain moisture salt gypsum after removing sodium chloride aqueous solution, it is 20%～50% that described moisture salt gypsum contains quality;
(2) add entry and gypsum rotating crystal exciting agent, the add-on of described water is 30%～40% of a moisture salt gypsum quality, the add-on of described gypsum rotating crystal exciting agent is 0.1%～2% of water and a moisture salt gypsum quality summation, and under agitation exciting changes brilliant 30～60 hours;
(3) filter, solid phase adds water washing, filtration, obtains dihydrate gypsum; (dihydrate gypsum can be used as cement setting retarder);
(4) dihydrate gypsum drying, calcining back obtain plaster of Paris.
The described separation of step (1) can adopt ordinary method to separate, and preferred filter press separation, gravity settling separation or centrifugal settling separate.
The described gypsum activation of step (2) is changeed brilliant preferred 40～48 hours of the time.
Step (3) is described to add water washing, filtering number of times is 1～2 time, and wash amount of water is 30%～50% of solid phase quality at every turn.
Preferred 180～200 ℃ of step (4) incinerating temperature.
Advantage of the present invention is:
By in moisture salt gypsum, adding the gypsum rotating crystal exciting agent, make dehydrated gyp-(anhydrous calciumsulphate) be converted into dihydrate gypsum, and make its particle grow up (granularity increase), the brilliant rate of the once commentaries on classics of dehydrated gyp-reaches more than 90%, make the median size of gypsum increase to 20 μ m～50 μ m from 4～6 original μ m, filter thereby improve, the condition of washing, significantly improve the throughput of filter plant, reduce the amount of carrying secretly of mother liquor simultaneously, reduce the saltiness in the gypsum, again by washing, filter, the saltiness of gypsum is reduced to below 0.2%, again drying, calcining, make the salt gypsum be converted into the plaster of Paris product, product meets the requirement of State Standard of the People's Republic of China GB/T 9776-2008 " plaster of Paris " (will implement on April 1st, 2009), and making it turns waste into wealth, and reduces the pollution to environment.
Description of drawings
Fig. 1 produces the plaster of Paris process flow sheet for the salt gypsum.
Embodiment
The present invention is described further below in conjunction with specific embodiment.
Embodiment 1
A kind of gypsum rotating crystal exciting agent is made up of following component: vitriolate of tartar 36%, Trisodium Citrate 0.1%, sodium sulfate 36%, yellow soda ash 27.9% by mass percentage.
Embodiment 2
A kind of gypsum rotating crystal exciting agent is made up of following component: vitriolate of tartar 31.8%, Trisodium Citrate 0.2%, sodium sulfate 40%, yellow soda ash 28% by mass percentage.
Embodiment 3
A kind of gypsum rotating crystal exciting agent is made up of following component: vitriolate of tartar 39.95%, Trisodium Citrate 0.05%, sodium sulfate 40%, yellow soda ash 20% by mass percentage.
Embodiment 4
A kind of gypsum rotating crystal exciting agent is made up of following component: vitriolate of tartar 20%, Trisodium Citrate 0.1%, sodium sulfate 40%, yellow soda ash 39.9% by mass percentage.
Embodiment 5
A kind of gypsum rotating crystal exciting agent is made up of following component: vitriolate of tartar 30%, Trisodium Citrate 0.1%, sodium sulfate 39.9%, yellow soda ash 30% by mass percentage.
Embodiment 6
A kind of gypsum rotating crystal exciting agent is made up of following component: vitriolate of tartar 40%, Trisodium Citrate 0.3%, sodium sulfate 20%, yellow soda ash 39.7% by mass percentage.
Embodiment 7
A kind of gypsum rotating crystal exciting agent is made up of following component: vitriolate of tartar 39.7%, Trisodium Citrate 0.3%, sodium sulfate 20%, yellow soda ash 40% by mass percentage.
Embodiment 8
The gypsum rotating crystal exciting agent comprises the steps: in the application of producing cement retarder with salt gypsum
(1) the salt calcium plaster is obtained moisture salt gypsum after sodium chloride aqueous solution is removed in gravity settling separation, it is 30% that described moisture salt gypsum contains quality;
(2) add the gypsum rotating crystal exciting agent that entry and embodiment 1 prepare, the add-on of described water is 35% of a moisture salt gypsum quality, and the add-on of described gypsum rotating crystal exciting agent is 1% of water and a moisture salt gypsum quality summation, and under agitation exciting changes brilliant 30 hours;
(3) filter, solid phase adds water washing, filtration, and wash amount of water is 30% of solid phase quality at every turn, obtains dihydrate gypsum, and dihydrate gypsum can directly be used as cement setting retarder.
Embodiment 9
The application of gypsum rotating crystal exciting agent in salt gypsum production plaster of Paris comprises the steps:
(1) the salt calcium plaster is obtained moisture salt gypsum after sodium chloride aqueous solution is removed in the filter press separation, it is 30% that described moisture salt gypsum contains quality;
(2) add the gypsum rotating crystal exciting agent that entry and embodiment 1 prepare, the add-on of water is 30% of a moisture salt gypsum quality, and the add-on of gypsum rotating crystal exciting agent is 1% of water and a moisture salt gypsum quality summation, and under agitation exciting changes brilliant 48 hours;
(3) filter, solid phase adds water washing, filters 2 times, obtains dihydrate gypsum; The saltiness of dihydrate gypsum is reduced to below 0.2%;
(4) obtain plaster of Paris after dihydrate gypsum drying, 190 ℃ of calcinings.
The brilliant rate of the once commentaries on classics of dehydrated gyp-reaches more than 90%, makes the mean particle size of gypsum increase to 30 μ m～50 μ m from 4～6 original μ m.
Plaster of Paris meets the requirement of State Standard of the People's Republic of China GB/T 9776-2008 " plaster of Paris ".
Embodiment 10
The application of gypsum rotating crystal exciting agent in salt gypsum production plaster of Paris comprises the steps:
(1) the salt calcium plaster is obtained moisture salt gypsum after sodium chloride aqueous solution is removed in gravity settling separation, it is 20% that described moisture salt gypsum contains quality;
(2) add the gypsum rotating crystal exciting agent that entry and embodiment 2 prepare, the add-on of water is 40% of a moisture salt gypsum quality, and the add-on of gypsum rotating crystal exciting agent is 0.1% of water and a moisture salt gypsum quality summation, and under agitation exciting changes brilliant 40 hours;
(3) filter, solid phase adds water washing, filtration, and amount of water is 30% of a solid phase quality, obtains dihydrate gypsum; The saltiness of dihydrate gypsum is reduced to below 0.2%;
(4) obtain plaster of Paris after dihydrate gypsum drying, 180 ℃ of calcinings.
The brilliant rate of the once commentaries on classics of dehydrated gyp-reaches more than 90%, makes the mean particle size of gypsum increase to 20 μ m～50 μ m from 4～6 original μ m.
Plaster of Paris meets the requirement of State Standard of the People's Republic of China GB/T 9776-2008 " plaster of Paris ".
Embodiment 11
The application of gypsum rotating crystal exciting agent in salt gypsum production plaster of Paris comprises the steps:
(1) the salt calcium plaster is obtained moisture salt gypsum after sodium chloride aqueous solution is removed in the centrifugal settling separation, it is 40% that described moisture salt gypsum contains quality;
(2) add the gypsum rotating crystal exciting agent that entry and embodiment 3 prepare, the add-on of water is 30% of a moisture salt gypsum quality, and the add-on of gypsum rotating crystal exciting agent is 2% of water and a moisture salt gypsum quality summation, and under agitation exciting changes brilliant 60 hours;
(3) filter, solid phase adds water washing, filtration, and amount of water is 50% of a solid phase quality, obtains dihydrate gypsum; The saltiness of dihydrate gypsum is reduced to below 0.2%;
(4) obtain plaster of Paris after dihydrate gypsum drying, 200 ℃ of calcinings.
The brilliant rate of the once commentaries on classics of dehydrated gyp-reaches more than 90%, makes the mean particle size of gypsum increase to 20 μ m～50 μ m from 4～6 original μ m.
Plaster of Paris meets the requirement of State Standard of the People's Republic of China GB/T 9776-2008 " plaster of Paris ".
Embodiment 12
The application of gypsum rotating crystal exciting agent in salt gypsum production plaster of Paris comprises the steps:
(1) the salt calcium plaster is obtained moisture salt gypsum after sodium chloride aqueous solution is removed in gravity settling separation, it is 50% that described moisture salt gypsum contains quality;
(2) add the gypsum rotating crystal exciting agent that entry and embodiment 4 prepare, the add-on of water is 35% of a moisture salt gypsum quality, and the add-on of gypsum rotating crystal exciting agent is 0.8% of water and a moisture salt gypsum quality summation, and under agitation exciting changes brilliant 40 hours;
(3) filter, solid phase adds water washing, filters 2 times, and each amount of water is that 40% of solid phase quality obtains dihydrate gypsum; The saltiness of dihydrate gypsum is reduced to below 0.2%;
(4) obtain plaster of Paris after dihydrate gypsum drying, 180 ℃ of calcinings.
The brilliant rate of the once commentaries on classics of dehydrated gyp-reaches more than 90%, makes the mean particle size of gypsum increase to 20 μ m～50 μ m from 4～6 original μ m.
Plaster of Paris meets the requirement of State Standard of the People's Republic of China GB/T 9776-2008 " plaster of Paris ".
Technical process
At first remove sodium chloride aqueous solution (saliferous mother liquor) from the calcium plaster of salt making system discharge and obtain moisture salt gypsum through conventional separation method separation, sodium chloride aqueous solution returns salt making system, moisture salt gypsum changes steel basin over to, add entry, gypsum rotating crystal exciting agent and change brilliant, the slip that changes after crystalline substance is finished filters, filtrate (mother liquor) part is returned the brilliant process of changeing, part is returned mine or salt making system, solid phase can directly be sold as cement setting retarder, also can add water washing, filtration obtains dihydrate gypsum, and dihydrate gypsum is the plaster of Paris product after drying, the calcining again.
Claims (9)
1. a gypsum rotating crystal exciting agent is characterized in that being made up of following component by mass percentage: vitriolate of tartar 20%～40%, Trisodium Citrate 0.05%～0.3%, sodium sulfate 20%～40%, yellow soda ash 20%～40%.
2. a kind of gypsum rotating crystal exciting agent according to claim 1 is characterized in that described vitriolate of tartar is 36%.
3. a kind of gypsum rotating crystal exciting agent according to claim 1 is characterized in that described Trisodium Citrate is 0.1%.
4. a kind of gypsum rotating crystal exciting agent according to claim 1 is characterized in that described sodium sulfate is 36%.
5. a kind of gypsum rotating crystal exciting agent according to claim 1 is characterized in that described yellow soda ash is 28%.
6. the application of gypsum rotating crystal exciting agent in salt gypsum production plaster of Paris is characterized in that comprising the steps:
(1) the salt calcium plaster is separated obtain moisture salt gypsum after removing sodium chloride aqueous solution, it is 20%～50% that described moisture salt gypsum contains quality;
(2) add the gypsum rotating crystal exciting agent of one of entry and claim 1 to 5, the add-on of described water is 30%～40% of a moisture salt gypsum quality, the add-on of described gypsum rotating crystal exciting agent is 0.1%～2% of water and a moisture salt gypsum quality summation, and under agitation exciting changes brilliant 30～60 hours;
(3) filter, solid phase adds water washing, filtration, obtains dihydrate gypsum;
(4) the dihydrate gypsum drying, after 180～200 ℃ of calcinings, obtain plaster of Paris.
7. gypsum rotating crystal exciting agent according to claim 6 is produced application in the plaster of Paris at the salt gypsum, it is characterized in that step (1) is described to be separated into filter press separation, gravity settling separation or centrifugal settling and to separate.
8. gypsum rotating crystal exciting agent according to claim 6 is produced application in the plaster of Paris at the salt gypsum, it is characterized in that step (2) is described to excite that to change the brilliant time be 40～48 hours.
9. gypsum rotating crystal exciting agent according to claim 6 is produced application in the plaster of Paris at the salt gypsum, it is characterized in that step (3) describedly adds water washing, filtering number of times is 1～2 time, and wash amount of water is 30%～50% of solid phase quality at every turn.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106587679A (en) * | 2016-12-06 | 2017-04-26 | 河南同伟建材有限公司 | Building gypsum powder produced by salt gypsum and preparation method thereof |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102169073B (en) * | 2010-02-25 | 2012-08-29 | 北新集团建材股份有限公司 | Method for chemically analyzing AII-s phase in building gypsum |
| CN106587678B (en) * | 2016-12-06 | 2019-02-26 | 河南同伟建材有限公司 | A kind of reclaimed gypsum powder and preparation method thereof for construction wall |
| CN111363414A (en) * | 2018-12-25 | 2020-07-03 | 湖南昌迅科技环保股份有限公司 | Method for preparing chalk by taking salt gypsum as raw material |
| CN110156358B (en) * | 2019-04-10 | 2021-04-27 | 河海大学 | Salt gypsum crystal transformation excitant, preparation method and application |
| CN113087423B (en) * | 2021-04-22 | 2022-09-06 | 深圳市青青源科技有限公司 | Method for preparing ultrahigh-strength gypsum powder by using natural gypsum under constant pressure |
| CN113149513B (en) * | 2021-05-12 | 2023-05-16 | 太原科技大学 | Reinforced crystal transformation auxiliary agent for calcined building gypsum and preparation method thereof |
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| US4152408A (en) * | 1977-11-25 | 1979-05-01 | Certain-Teed Corporation | Fibrous calcium sulfate |
| CN101113084A (en) * | 2007-07-06 | 2008-01-30 | 天津大学 | Method for preparing shape-controlled alpha-semi-hydrated gypsum by using flue gas desulfurized gypsum |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106587679A (en) * | 2016-12-06 | 2017-04-26 | 河南同伟建材有限公司 | Building gypsum powder produced by salt gypsum and preparation method thereof |
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