CN1061391A - The method of production of fine and lightweight calcium carbonate from mud of calcium carbide - Google Patents
The method of production of fine and lightweight calcium carbonate from mud of calcium carbide Download PDFInfo
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- CN1061391A CN1061391A CN 90106307 CN90106307A CN1061391A CN 1061391 A CN1061391 A CN 1061391A CN 90106307 CN90106307 CN 90106307 CN 90106307 A CN90106307 A CN 90106307A CN 1061391 A CN1061391 A CN 1061391A
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Abstract
A kind of calcium carbide mud is produced the method for hexagonal system calcite type light calcium carbonate, be through the sedimentation enrichment that removes the gred by calcium carbide mud, carrying out multistage spinning liquid again separates, sand and a large amount of fine charcoals end are removed, slurry after the separation is adjusted 6-8 ° of Be ' and is sent the carbonating tower carbonization, 40-50 ℃ of carbonization temperatures, carbonating tower working pressure 0.55-0.60kg/cm
2, concentration of carbon dioxide is 12-25%.The calcium carbonate serosity that generates after the carbonization is finished product through sedimentation layering, separating and dehydrating, drying, mistake screen sizing.It can make the weighting agent of industries such as rubber, plastics, coating, printing ink, also is used for welding electrode, organic synthesis, metallurgy, chemical building material, agricultural chemicals, asbestos etc. productions.
Description
It is a kind of method of utilizing calcium carbide mud to produce the calcite type fine and lightweight calcium carbonate of hexagonal system.
The production of lime carbonate is different because of the difference production method (technology) of raw material, in existing technical literature record, the production method (technology) of three kinds of raw material routes is arranged.
(1), the secondary waste mud lime carbonate of ammonia alkali legal system alkali, its technical process is:
Secondary mud → washing → thickening → centrifugation → drying → pulverizing → the finished product that gives up
The secondary of the ammonia alkali legal system alkali mud that gives up, wherein carrying a large amount of sodium chloride solutions secretly, wash freshen and impurity with water through the multilayer mud cleaning bucket, wash water reclaims going salt, wash mud (lime carbonate) through the thickener enrichment, slough moisture through whizzer again, send the moisture eliminator crushed after being dried lime carbonate that gets product then.
(2), causticization waste mud lime carbonate, Fig. 1 is seen in its technical process
In the useless mud of causticization legal system caustic soda, except that lime carbonate, also contain grittiness, superfluous ash and micro-caustic soda, so need water to wash in the multilayer mud cleaning bucket, light buck is recycled, and washes mud again after wet cyclone is removed gravel, by the thickener thickening.Lime mud through thickening enters carbonation tank, feeds CO
2Gas carries out carbonating to remove trace alkalescence, obtains finished product through whizzer separation moisture, drying, pulverizing then.
(3) carbonation method is made light calcium carbonate, and its technical process is:
Lime → digestion → spinning liquid separation → rinsing → carbonization → thickening → centrifugation → drying → sieve → finished product
It is the Wingdale that will wash that carborization is made light calcium carbonate, is crushed to 50-150mm, and the anthracite granularity is 38-50mm.Coal: Wingdale ratio is 1: 8-1: 11.Put into the limestone kiln, 900-1100 ℃ of following calcination.Wingdale at high temperature resolves into lime and carbonic acid gas:
With the lime that discharge the bottom, limestone kiln, send in the revolution digestive organ, add water and be digested to milk of lime, after the process wet cyclone is isolated most of unslaked lime, enter grey newborn storage tank, remove impurity through rinsing tub again.
Milk of lime water after the removal of impurity transfers to 10-18 ° of Be ', sends into carbonating tower and follows by coming out at the top, limestone kiln, through the carbonic acid gas carbonization of washing tower washing.Carbonization temperature is 60-70 ℃, and concentration of carbon dioxide is about 30-40%, and carbonization pressure is about 0.8 kilograms per centimeter
2, carbonization time is according to CO
2Concentration, flow and liquid level volume and difference, general carbonization time is 5-6 hour, the carbonization terminal point is controlled (pH value is about 7) with the survey pH value.Its reaction is as follows:
The resulting calcium carbonate slurry of carbonization through thickening (enrichment) pond thickening, by being pumped into header tank, is sent into widely different commentaries on classics kiln dried again after the top-suspended basket centrifuge dehydration, water ratio can be reduced to below 0.3%, crosses 120 mesh sieves and obtains finished product.
Lime carbonate proportion 2.7-2.949, white powder, odorless, tasteless.Two kinds of unformed and crystal types are arranged, and crystal type can be divided into the calcite type of rhombic aragonitic and hexagonal system again.
More than narration is the production method (technology) of three kinds of raw material routes of lime carbonate, and the specification of its product is all by GB GB4794-84.See Table (1)
Above prior art is all from Chemical Industry Press's version " Chemical Manufacture flowchart illustrations " in 1988.
The purpose of this invention is to provide a kind of waste residue (calcium carbide mud) that utilizes calcium carbide (carbide of calcium) to produce and discharged behind the acetylene gas, the method for producing hexagonal system calcite type fine and lightweight calcium carbonate.Details are as follows now calcium carbide mud to be produced the method for hexagonal system calcite type calcium carbonate superfine powder:
Calcium carbide mud is the waste residue that enterprises such as chemical industry, machinery discharge in the process of hydrolysis preparation of ethyne by carbide gas, also claims carbide slag, calcium carbide cream, main component Ca(OH)
2, and contain a spot of impurity (MgO, Fe
2O
3Al
2O
3, SiO
2) it is similar to the composition of lime putty.The chemical ingredients of calcium carbide mud and lime putty sees Table (2).Physics, the chemical property of calcium carbide mud and lime putty see Table (3)
The chemical component table of calcium carbide mud (2)
| Composition | CaO | MgO | Fe 2O 3 | Al 2O 3 | SiO 2 | Loss on ignition |
| Calcium carbide cement content % | 68.59 | 0.07 | 0.26 | 2.20 | 0.68 | 26.88 |
| Lime putty content % | 68.34 | 5.22 | 0.31 | 0.54 | 0.36 | 25.33 |
The physical and chemical performance table (3) of calcium carbide mud and lime putty
| Raw material | Effective constituent CaO+MgO % | Unit weight (Kg/m 3) standard circular cone degree of sinking to | Fineness screenings 4900 holes/Cm 2 |
| Calcium carbide mud | 65.66 | 1324 | 3.4 |
| Lime putty | 63.00 | 1332 | 17－20 |
From the table (2) as can be seen, the chemical ingredients of calcium carbide mud is similar to lime putty substantially, wherein the content of MgO is lower, trace it to its cause is because lime and coke when reacting in furnace of calcium carbide, MgO in the unslaked lime is reduced into Mg rapidly in the melting district, when Mg overflowed in this red-hot district in a large number with the steam form, a part of Mg and CO reaction generated MgO; Another part then with airborne O
2Reaction generates MgO and takes away 85%, makes the content of MgO in the calcium carbide be lower than the content of MgO among the CaO, so the content in the calcium carbide mud is also just low, belongs to low MgO(＜4%) lime.This is favourable to the clay light calcium carbonate of making of calcium carbide.In addition, calcium carbide mud and lime putty are respectively under the 12cm condition at standard round cone degree of sinking to: calcium carbide mud 1326Kg/M
3; Lime putty 1332Kg/M
3All belong to secondary lime putty (1330-1350Kg/M
3) scope.
The technical process of production of fine and lightweight calcium carbonate from mud of calcium carbide:
Technological process block-diagram
(calcium carbide mud)/() sediment enrichment → spinning liquid stage trapping → carbonization → sedimentation enrichment → centrifuge dehydration → drying → screening → packing
Calcium carbide mudflow from carbide-feed generator is gone in the settling bowl, the quiescent settling enrichment, treat layering after, the upper strata clear water is put into clean water basin, squeezes into producer with pump and utilizes.The bottom underflow is squeezed into wet cyclone with pump after stirring, part slagging-off, and underflow liquid enters the calcium carbide suction pit through meander trough, and carry out the level Four spinning liquid after the stirring successively and separate, with the sand in the calcium carbide mud, a large amount of fine charcoal end centrifugation and removing.Remove the calcium carbide mud at sand, charcoal end and squeeze into calcium carbide mud screened stock pond with pump, the concentration of regulation and control slurry is 6-8 ° of Be ', to treat carbonization.
The used carbon dioxide of carbonization is from the limestone kiln, and the kiln gas of discharging because of the limestone kiln is carried a large amount of dust secretly and be useless and be deleterious gas to carbonization, must remove before entering carbonating tower, when guaranteeing carbonization to the requirement of carbon dioxide.
At first lime-kiln gas is removed oarse-grained dust through cyclonic separator, enter the washing tower that filler is housed then and wash.In tower kiln gas from bottom to top, washing water are from top to bottom, both carry out counter current contact, fine dusts is adsorbed with water, enters circulating water pool with water in the kiln gas, simultaneously the SO in the kiln gas
2Gas also is adsorbed with water and (and loses portion C O
2Gas), make gas temperature reduce to room temperature (30-35 ℃).Wash a used water part by external water source (new water) supply, another part is then used by the water cycle in the circulating water pool.Water section in the pond emits, and to guarantee water quality and water temperature, the kiln gas of using washing tower is near water temperature.Kiln gas goes out tower after the scum dredger foam removal on washing tower top, behind the moisture that the air water separator separation is carried secretly, kiln gas enters compressor and pressurizes, kiln gas after the pressurization is cooled to 30-40 ℃ and remove the machine oil of bringing in the compressor housing through oil separator through strong tubular heat exchanger, enters the surge tank voltage stabilizing then and stores.
Carbonization:, after stirring, squeeze in the carbonating tower with pump with the calcium carbide material-mud of 6-8Be '; Liquid level is controlled at 6/5/7ths-seven of tower height and is advisable.Feeding the pressure that is come by surge tank again is 0.55-0.60kg/cm
2(MPa), temperature is 30-40 ℃ kiln gas (main component is a carbonic acid gas), concentration of carbon dioxide is the 12-25%(volume).The working pressure of carbonating tower is 0.6Kg/cm
2, the operation top temperature is 40-50 ℃.Kiln gas enters carbonating tower from the bottom of carbonating tower, and gas is seething upwards operation in tower, and Yin Tanei is equipped with agitator, and carbonic acid gas passes whole liquid layer, and gas, liquid two-phase can fully contact, and reaction evenly.Unreacted gas enters atmosphere.Because of calcium hydroxide and carbon dioxide reaction generate lime carbonate is thermopositive reaction, in the reaction process in the tower temperature needn't control, promptly do not need heating, do not need cooling, when question response is reached home in the tower temperature can reach 40-50 ℃.Carbonization time is 25-60 minute,, does not need to add phosphoric acid for the basicity of control finished product in tower during near terminal point in carburizing reagent.Because there is not the calcium oxide particle of end digestion in the calcium carbide mud, it is such that the image-stone emplaster is not produced light calcium carbonate, and indigested calcium oxide particulate continues the moisture absorption and bursts in carbonization process, causes basicity to raise, and needs to add the basicity that phosphoric acid is stablized finished product.And calcium carbide mud is produced light calcium carbonate, and basicity is stable.
The mensuration of carbonization terminal point: materials from carbonating tower, splash into phenolphthalein indicator, if be neutral reaction, reagent does not redden, and then shows to react to reach home, and the ripe slurry of lime carbonate can be put into ripe stock tank from the bottom of carbonating tower, squeeze into pump again and carry out sedimentation in the settling bowl, make it layering.Tangible interface is arranged after the slurries layering, and the upper strata is a clear water, and lower floor is a underflow, and clear water enters circulating water pool and makes the ashing water and (because the content of magnesium is few in the calcium carbide mud, therefore, do not need to do Mg
2+Handle and promptly can be recycled).The concentration of lower floor's underflow (calcium carbonate serosity) increases along with the prolongation of time in settling bowl, after 16-20 ° of B é ' back or layering underflow is all put into the lime carbonate deckered stock chest.
Dehydration, drying: the slurry in the deckered stock chest is under whipped state, starting transferpump sends into it in header tank, carry out solid-liquid separation through top-suspended basket centrifuge, filtrate is returned circulating water pool and is used for digestion, the filter cake that with water content is 30-37% directly is discharged on the travelling belt of transfer roller by top-suspended basket centrifuge, entering pulverizer pulverizes, filter cake is broken into powdery feeding chapelet, by falling into after the chapelet lifting in the dish feeding machine of garden, add in the rotary dryer by the certain feeding quantity of charging machine control again and carry out drying.Because of the resulting filter cake in back that dewaters through top-suspended basket centrifuge, its water content for the water content that reaches product is the requirement of 0.3-0.4%, must be carried out drying up to 30-37%.Exsiccant equipment is rotary dryer (stove), and drying machine divides two sections of heating, coolings, and the temperature 600-700 of heating zone ℃, the temperature of cooling section is 60 ℃-80 ℃.In heating zone, contained humidity is heated and becomes water vapor in the powder lime carbonate, be admitted to wet dust collector from anterior discharge of moisture blower fan, steam coagulation Cheng Shui after cooling off, the calcium carbonate powders of carrying secretly in the water vapor is also along with being adsorbed with water, be collected in the bottom of wet dust collector, non-condensable gases enters atmosphere.Powder lime carbonate continuation after the dehydration moves forward in rotary dryer and enters the cooling section cooling, and temperature out is 60-80 ℃.By in the conveying belt feeding chapelet, send into sieve apparatus and cross screen sizing then, after the classification by auger be delivered to that outlet is measured, pack, sealing, warehouse-in.The used thermal source of rotary dryer is a stack gas, adopts coal combustion to provide by the combustion chamber, stack gas indirectly and filter cake (powdery) carry out heat exchange.Stack gas enters at middle flue, near afterbody fume collecting chamber, turn back and flow into the cavity that the trilateral air-returen flue is formed, return the front portion of moisture eliminator, leave drying machine by the top, through the flue dust cyclonic separator in stack gas with flue dust separate after, gas enters atmosphere by separator top suction flue gas blower fan after water-bath, dust is then regularly discharged by the bottom in the separator, and stack gas dustiness after the cyclonic separator dedusting conforms to national specified discharge standard.
The purposes of this novel fine calcium carbonate is very extensive, and it can make rubber, plastics, coating, the weighting agent of industries such as printing ink.Be used for organic synthesis, metallurgy, agricultural chemicals, building materials, chemical industry, asbestos etc. productions.In addition, also release agent of usable oils felt etc.
Advantage and effect:
1, utilizes calcium carbide mud to produce hexagonal system calcite type fine and lightweight calcium carbonate, can eliminate of the pollution of calcium carbide mud, can save a large amount of material of construction (lime) and fuel (coal 140kg/ ton lime) again environment.
2, because of raw material is calcium carbide mud, has saved digestion workshop section, calculate with the design scale of producing 10000 tons per year, can save 12.0 ten thousand yuan of the facility investments of digestion workshop section, 100,000 yuan of construction investments are saved 150,000 tons of digestion waters, brownout 500,000 degree.
3,, do not need to add phosphoric acid and control basicity during in carburizing reagent, calculate, can save 30 tons of phosphoric acid every year, count 60,000 yuan by the light calcium carbonate of producing 10000 tons per year near terminal point.
4, the carbonization temperature of calcium carbide mud production light calcium carbonate is 40-50 ℃, the carbonization temperature of prior art is 60-70 ℃, and do not need to add any additives, do not need to take heating or cooling measure, do not need ageing, do not need the continuous several times carbonization, a carbonization can be produced 60,000 crystallographic system calcite type fine and lightweight calcium carbonates.And additive method need be taked cooling measure, and ageing method needs ageing heating, spraying process to need the continuous several times carbonization.(seeing " calcium carbonate industry " book that chemical department of Ministry of Chemical Industry, institute of scientific-technical information of Ministry of Chemical Industry published cooperatively in 1986).
Claims (2)
1, a kind of calcium carbide mud is produced the method for hexagonal system calcite type fine and lightweight calcium carbonate and is: calcium carbide mud is through the sedimentation enrichment that removes the gred, slurries behind the enrichment separate through level Four, the concentration of the calcium carbide mud after separating is adjusted to 6-8 ° of Be ' send into the carbonating tower carbonization, carbonization temperature is 40-50 ℃, concentration of carbon dioxide is 12-25%, and the working pressure of carbonating tower is 0.55-0.60Kg/Cm
2A carbonization, carbonization time is 25-60 minute, do not add phosphoric acid during carbonization and adjust basicity, the calcium carbonate serosity that generates after the carbonization is with the sedimentation layering, carries out centrifuge dehydration, drying then, crosses screen sizing, packing, and the concentration that it is characterized in that sending into the calcium carbide mud of carbonating tower is 6-8 ° of Be ', carbonization temperature is that 40-50 ℃, concentration of carbon dioxide are 12-25%, and the carbonating tower working pressure is 0.55-0.60Kg/Cm
2, a carbonization, carbonization time is 25-60 minute.
2, the carbonization temperature of newly stating according to claim is 40-50 ℃, it is characterized in that carbonization temperature 40-50 ℃ does not need heating when being carburizing reagent, does not need the terminal temperature of lowering the temperature.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 90106307 CN1061391A (en) | 1990-11-13 | 1990-11-13 | The method of production of fine and lightweight calcium carbonate from mud of calcium carbide |
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|---|---|---|---|
| CN 90106307 CN1061391A (en) | 1990-11-13 | 1990-11-13 | The method of production of fine and lightweight calcium carbonate from mud of calcium carbide |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100389068C (en) * | 2004-09-24 | 2008-05-21 | 曲玉珠 | Preparation of light calcium carbonate by calcite |
| CN106477611A (en) * | 2016-10-17 | 2017-03-08 | 上海新增鼎工业科技有限公司 | A kind of method preparing precipitated calcium carbonate using carbide slag and flue solid/liquid/gas reactions |
| CN112079373A (en) * | 2020-09-10 | 2020-12-15 | 浙江浙能嘉华发电有限公司 | Device and process for preparing micron-sized homogeneous calcium carbonate through causticization reaction |
-
1990
- 1990-11-13 CN CN 90106307 patent/CN1061391A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100389068C (en) * | 2004-09-24 | 2008-05-21 | 曲玉珠 | Preparation of light calcium carbonate by calcite |
| CN106477611A (en) * | 2016-10-17 | 2017-03-08 | 上海新增鼎工业科技有限公司 | A kind of method preparing precipitated calcium carbonate using carbide slag and flue solid/liquid/gas reactions |
| CN106477611B (en) * | 2016-10-17 | 2018-06-26 | 上海新增鼎网络技术有限公司 | A kind of method for preparing precipitated calcium carbonate using carbide slag and flue solid/liquid/gas reactions |
| CN112079373A (en) * | 2020-09-10 | 2020-12-15 | 浙江浙能嘉华发电有限公司 | Device and process for preparing micron-sized homogeneous calcium carbonate through causticization reaction |
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