CN104803405A - White mud calcium carbonate treatment technology - Google Patents
White mud calcium carbonate treatment technology Download PDFInfo
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- CN104803405A CN104803405A CN201410041002.5A CN201410041002A CN104803405A CN 104803405 A CN104803405 A CN 104803405A CN 201410041002 A CN201410041002 A CN 201410041002A CN 104803405 A CN104803405 A CN 104803405A
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- calcium carbonate
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Abstract
The invention provides a white mud calcium carbonate treatment technology. The technology sequentially comprises the following steps: 1, adding water to white mud with the solid content of 40-70wt%, obtained after washing a causticizing workshop, to dilute the white mud in order to obtain a white mud emulsion with the solid content of 10-35wt%; 2, introducing highly pure carbon dioxide into the white mud calcium carbonate emulsion, and reacting while stirring; and 3, sending a mixed solution obtained in step 2 into a high pressure upflow reaction kettle, and continuously reacting while stirring, wherein the reaction kettle is hermetically sealed, is provided with a stirring device, and can control the pressure and the temperature of carbon dioxide. The treatment technology well solves the problems of uneven shape and white mud calcium carbonate particles and difficult improvement of the physical and chemical indexes of a white mud calcium carbonate product, and facilitates filling in the papermaking industry.
Description
Technical field
The present invention relates to the treatment process of by product white clay in a kind of papermaking process, be specifically related to the treatment process of calcium carbonate in white clay.
Background technology
If the black liquor that paper industry slurrying production process produces directly discharge can cause serious environmental pollution, therefore people have employed many treatment process and solve pollution problem.The applicant proposes the method for a kind of brand-new alkali collection solid slag comprehensive utilization in Chinese patent application CN101020182A, the method is improved traditional burning and causticization process, solve the secondary pollution that waste residue brings, be widely used in the production of paper industry high-grade culture paper.
But, in alkali collection causticization production process, the excessive ash (Ca (OH) containing 2-5wt% in the white clay that causticization produces
2) and the sila matter of 0.5-5wt%, simultaneously due to the environmental influence that white mud calcium carbonate particle is generated, particle surface shape and irregularity and an even property of particle is very poor, make the physical and chemical indexes of white mud calcium carbonate greatly reduce.
Traditional carborization carries out carbonizing treatment with carbonic acid gas to white clay, removed by remaining ash, reduce its pH value.Adopt carbonizing treatment white mud calcium carbonate, although can remove most excessive ash, adjust pH value, can not effectively be processed for sila matter and calcium carbonate particles shape, the physical and chemical indexes of white mud calcium carbonate can not improve, and quality product is difficult to improve.
Chinese patent CN101003383 discloses a kind of new technique for refining filler of calcium carbonate from lime mud.Comprise and get the raw materials ready, clarify washing, scalping, expansion solution wadding and carbonization, fine screen and finished product and store; It is characterized in that: expansion solution wadding and carbonation step complete, expansion solution is wadded a quilt with cotton and after carbonization, calcium carbonate particle diameter D50 is 3.0 ∽ 7.0um, and median size is 5.5 ∽ 8.5um.This technique makes the whiteness of recovery light calcium carbonate reach more than 89%ISO, pH value: 8.4 ∽ 10.5, settling volume: >=2.6ml/g, pulpous state calcium carbonate concentration: 14 ∽ 16%, product can meet the requirement of joining on high-speed paper machine and copying high-grade culture paper, and production cost only has about 1/3rd of commodity light calcium carbonate.But its shortcoming is that this technique main emphasis is mechanical type solution wadding (grinding), and macrobead white mud calcium carbonate is ground to form small calcium carbonate particles by mechanical aspects, passing into carbonic acid gas carbonization is also only by wherein part Ca (OH)
2be converted into calcium carbonate granule, the calcium carbonate granule granularity shape of this Process Production and irregularity and an even property of particle is very poor, product existing defects, cannot meet the use of higher paper product papermaking requirement and PVC rubber and plastic industry; Cannot remove the impurity silicon included in white mud calcium carbonate, the efficiency of carbonization is simultaneously low, and carbonic acid gas can escape in air, causes amount of carbon dioxide consumption to be increased.
Ultra-fine CaCO
3as novel high-grade functional filling material, be widely used in the industrial circles such as rubber, plastics, ink, coating, papermaking, also can be used for the industries such as medicine, food, toothpaste and feed.Difform CaCO
3can be applicable to different fields, as cube, spherical CaCO
3be mainly used in the industries such as plastics, rubber, coating, ink; Threadiness CaCO
3can be used for the industry such as rubber, papermaking; Fusiform CaCO
3can be used for the industries such as papermaking, plastics, rubber.Therefore, CaCO is studied
3, particularly the morphology Control of white mud calcium carbonate has realistic meaning.
Summary of the invention
The object of this invention is to provide a kind for the treatment of process of white mud calcium carbonate, while completing carburizing reagent, the shape of white mud calcium carbonate particle is repaired, change the homogeneity of the regular and particle of white mud calcium carbonate shape, also make sila matter obtain simultaneously and remove.
The treatment process of white mud calcium carbonate of the present invention, in turn includes the following steps:
(1) be the white clay thin up of 40 ~ 70wt% by causticizing plant solid content after washing, obtain the white clay emulsion that solid content is 10 ~ 35wt%;
(2) high-pureness carbon dioxide is passed into white mud calcium carbonate emulsion, react and stir;
(3) then the mixed solution in step (2) is sent into high pressure flow lifting type reactor, reactor is hermetically sealed, with whipping appts, and can control pressure carbon dioxide and temperature, continues react and stir simultaneously.
(4) white mud calcium carbonate is in reactor overflow, flows into the ageing of white mud calcium carbonate digestion tank, and the white mud calcium carbonate after ageing is dry through sand mill pulverizing, drying machine, obtains white mud calcium carbonate product.
Wherein the solid content of the white clay emulsion of step (1) preferably dilutes is 20 ~ 30wt%;
Reaction times in step (2) is 45 ~ 90 minutes, and the purity of carbonic acid gas, preferably more than 85%, controls reacted white mud calcium carbonate emulsion PH and is less than 7.
Pressure-controlling in step (3) is at 0.10 ~ 2.0MPa, if hypertonia, carbon dioxide-depleted amount is too large, acidifying calcium carbonate too much will generate Calcium hydrogen carbonate, soluble in water, and equipment pressure hazard, cannot bear, if hypotony, in solution, carbonic acid gas is less, cannot meet and remove wherein calcium hydroxide, stablizes pH value and remove the effect of sila matter.
Pressure in step (3) preferably controls at 0.2 ~ 1.5MPa, preferably 0.3-1.0MPa, by controlling closed reactor pressure valve and carbonic acid gas inlet Valve controlling pressure.
Temperature of reaction in step (3) controls at 5-45 DEG C, if temperature is too low, solution is close to freezing point, and mobility is bad, cannot react, if temperature is too high, meeting carbon dioxide solubility is less in water, cannot arrive respective concentration, carbonic acid gas is escaped too much from water, lowers efficiency.
Temperature in step (3) preferably controls at 25-40 DEG C.
The stirring reaction time in step (3) is 45-90 minute.
The subsidiary absorption unit of flow lifting type reactor in step (3), can absorb carbonic acid gas of escaping out from white mud calcium carbonate emulsion.
Crystal control agent can also be added after white clay thin up in step (1), crystal control agent is Sodium hexametaphosphate 99 preferably, add-on is the 0.1-0.6wt% of solid content, consumption is too low, the limited efficiency of crystal controlling, consumption is too high, easily produces reunion, Sodium hexametaphosphate 99 can make fusiform content in gained calcium carbonate higher, can better for paper industry.
Method of the present invention the carbon dioxide of high purity such as more than 85% or liquid is joined in white mud calcium carbonate carbonization finishing retort, by supercharging, temperature control, allow in retort and keep excessive saturated carbonic acid, thus, produce a low sour environment containing finite concentration carbonic acid.Here retort is confined reaction tank, can increase concentration and the solubleness of carbonic acid gas under closed environment.
In so low acid-reaction tank, can form excessive saturated carbonic acid, these carbonic acid are meeting and the remaining Ca (OH) in white mud calcium carbonate on the one hand
2reaction, makes the pH value of white mud calcium carbonate obtain rapid adjustment, and the new component that reaction generates is useful calcium carbonate composition; On the other hand, excessive saturated carbonic acid environment, white mud calcium carbonate particle generation surface reaction can be made, realize the finishing process of white mud calcium carbonate crystal formation, meanwhile, sila matter in white mud calcium carbonate also can be obtained acidification and remove by excessive saturated carbonic acid, and the new component that reaction generates is silicic acid (colloid), this new component can be retained or be removed by mode of washing under the condition not affecting the finished product result of use, and the quality of white mud calcium carbonate is improved.
The chemical equation occurred in this process is as follows:
CO
2+H
2O+Ca(OH)
2→CaCO
3+H
2O
CaSiO
3+CO
2+H
2O→H
2SiO
3+CaCO
3
The present invention produces following beneficial effect:
(1) the present invention eliminates the problem that alkali collection causticization washes remaining excessive ash in rear white clay preferably;
(2) the present invention eliminates alkali collection causticization preferably and washes sila confrontation product in rear white clay and use the problem bringing negative impact;
(3) the present invention solves the problem that the uneven and white mud calcium carbonate product physical and chemical indexes of white mud calcium carbonate particle shape is difficult to improve preferably, can improve the content of spindle calcium carbonate, be conducive to the filling at paper industry;
(4) it is convenient that present invention process is simple, operation is implemented, and cost is low;
(5) silica removal rate of the present invention is high, the silicon in white clay can be controlled to below 0.5wt%.
Accompanying drawing explanation
Fig. 1 is process flow sheet of the present invention
Embodiment
Below in conjunction with specific embodiment, the invention will be further described.
Embodiment 1
The white clay that causticizing plant comes, the white mud calcium carbonate concentration after pre-hung machine washing is washed is 40% ~ 70%, and dilute with water, adjusts to concentration 20wt%(solid content), measuring its residual ash content is 4.5wt%, and silicone content is 3.0wt%, and pH value is more than 12.High-pureness carbon dioxide is passed into white mud calcium carbonate emulsion, react and stir 50 minutes, pH value is determined as 6.85, then high pressure flow lifting type reactor is sent into, stirring reaction in high pressure flow lifting type reactor, temperature of reaction is 30 DEG C, and reactor pressure controls at 0.20MPa.Measuring result after reaction: emulsion pH value is 8.6, remaining ash content 0.56wt%, silicone content 0.45wt%.White mud calcium carbonate after ageing is pulverized through sand mill, drying machine is dry, obtains white mud calcium carbonate product.White mud calcium carbonate obviously becomes neat and well spaced in its particle surface shape of high power Microscopic observation.
Embodiment 2
The white clay that causticizing plant comes, the white mud calcium carbonate concentration after pre-hung machine washing is washed is 40% ~ 70%, by dense for the white mud calcium carbonate after washing to 20wt%(solid content), measuring its residual ash content is 4.5wt%, and silicone content is 3.0wt%, and pH value is more than 12.High-pureness carbon dioxide is passed into white mud calcium carbonate emulsion, react and stir 60 minutes, pH value is determined as 6.75, and then send into high pressure flow lifting type reactor, stirring reaction in high pressure flow lifting type reactor, temperature of reaction is 30 DEG C, reactor pressure control 0.30MPa.Measuring result after reaction: emulsion pH value is 8.5, remaining ash content 0.49wt%, silicone content 0.43wt%.White mud calcium carbonate after ageing is pulverized through sand mill, drying machine is dry, obtains white mud calcium carbonate product.White mud calcium carbonate obviously becomes neat and well spaced in its particle surface shape of high power Microscopic observation.
Embodiment 3
The white clay that causticizing plant comes, the white mud calcium carbonate concentration after pre-hung machine washing is washed is 40% ~ 70%, and the white mud calcium carbonate after washing is adjusted to concentration 20wt%(solid content), measuring its residual ash content is 4.50wt%, and silicone content is 3.0wt%, and pH value is more than 12.High-pureness carbon dioxide is passed into white mud calcium carbonate emulsion, react and stir 70 minutes, pH value is determined as 6.75, and then send into high pressure flow lifting type reactor, stirring reaction in high pressure flow lifting type reactor, temperature of reaction is 30 DEG C, reactor pressure control 0.40MPa.Measuring result after reaction: emulsion pH value is 8.48, remaining ash content 0.45wt%, silicone content 0.40wt%.White mud calcium carbonate after ageing is pulverized through sand mill, drying machine is dry, obtains white mud calcium carbonate product.White mud calcium carbonate obviously becomes neat and well spaced in its particle surface shape of high power Microscopic observation.
Embodiment 4
The white clay that causticizing plant comes, the white mud calcium carbonate concentration after pre-hung machine washing is washed is 40% ~ 70%, and dilute with water, adjusts to concentration 20wt%(solid content), measuring its residual ash content is 4.50wt%, and silicone content is 3.0wt%, and pH value is more than 12.Add 0.5%(in emulsion after the adjustment relative to solid content) Sodium hexametaphosphate 99, stir.High-pureness carbon dioxide is passed into white mud calcium carbonate emulsion, react and stir 70 minutes, pH value is determined as 6.70, and then send into high pressure flow lifting type reactor, stirring reaction in high pressure flow lifting type reactor, temperature of reaction is 30 DEG C, reactor pressure control 0.70MPa.Measuring result after reaction: emulsion pH value is 8.4, remaining ash content 0.42wt%, silicone content 0.38wt%.White mud calcium carbonate after ageing is pulverized through sand mill, drying machine is dry, obtains white mud calcium carbonate product.White mud calcium carbonate obviously becomes neat and well spaced in its particle surface shape of high power Microscopic observation, and granule crystal spindle-type and rectangle ratio improve.
Embodiment 5
The white clay that causticizing plant comes, the white mud calcium carbonate concentration after pre-hung machine washing is washed is 40% ~ 70%, and dilute with water, adjusts to concentration 25wt%(solid content), measuring its residual ash content is 4.8wt%, and silicone content is 3.6wt%, and pH value is more than 12.High-pureness carbon dioxide is passed into white mud calcium carbonate emulsion, react and stir 80 minutes, pH value is determined as 6.80, and then send into high pressure flow lifting type reactor, stirring reaction in high pressure flow lifting type reactor, temperature of reaction is 40 DEG C, reactor pressure control 0.40MPa.Measuring result after reaction: emulsion pH value is 8.3, remaining ash content 0.54wt%, silicone content 0.50wt%.White mud calcium carbonate after ageing is pulverized through sand mill, drying machine is dry, obtains white mud calcium carbonate product.White mud calcium carbonate obviously becomes neat and well spaced in its particle surface shape of high power Microscopic observation.
Embodiment 6
The white clay that causticizing plant comes, the white mud calcium carbonate concentration after pre-hung machine washing is washed is 40% ~ 70%, and dilute with water, adjusts to concentration 25wt%(solid content), measuring its residual ash content is 4.8wt%, and silicone content is 3.6wt%, and pH value is more than 12.High-pureness carbon dioxide is passed into white mud calcium carbonate emulsion, react and stir 80 minutes, pH value is determined as 6.70, and then send into high pressure flow lifting type reactor, stirring reaction in high pressure flow lifting type reactor, temperature of reaction is 40 DEG C, reactor pressure control 0.50MPa.Measuring result after reaction: emulsion pH value is 8.2, remaining ash content 0.49wt%, silicone content 0.46wt%.White mud calcium carbonate after ageing is pulverized through sand mill, drying machine is dry, obtains white mud calcium carbonate product.White mud calcium carbonate obviously becomes neat and well spaced in its particle surface shape of high power Microscopic observation.
Embodiment 7
The white clay that causticizing plant comes, the white mud calcium carbonate concentration after pre-hung machine washing is washed is 40% ~ 70%, and dilute with water, adjusts to concentration 25wt%(solid content), measuring its residual ash content is 4.8wt%, and silicone content is 3.6wt%, and pH value is more than 12.Add 0.5%(in emulsion after the adjustment relative to solid content) Sodium hexametaphosphate 99, stir.High-pureness carbon dioxide is passed into white mud calcium carbonate emulsion, react and stir 80 minutes, pH value is determined as 6.70, and then send into high pressure flow lifting type reactor, stirring reaction in high pressure flow lifting type reactor, temperature of reaction is 40 DEG C, reactor pressure control 0.70MPa.Measuring result after reaction: emulsion pH value is 8.0, remaining ash content 0.42wt%, silicone content 0.43wt%.White mud calcium carbonate after ageing is pulverized through sand mill, drying machine is dry, obtains white mud calcium carbonate product.White mud calcium carbonate obviously becomes neat and well spaced in its particle surface shape of high power Microscopic observation, and granule crystal spindle-type and rectangle ratio improve.
Embodiment 8
The white clay that causticizing plant comes, the white mud calcium carbonate concentration after pre-hung machine washing is washed is 40% ~ 70%, and dilute with water, adjusts to concentration 30wt%(solid content), measuring its residual ash content is 5.0wt%, and silicone content is 2.9wt%, and pH value is more than 12.High-pureness carbon dioxide is passed into white mud calcium carbonate emulsion, react and stir 80 minutes, pH value is determined as 6.80, then high pressure flow lifting type reactor is sent into, stirring reaction in high pressure flow lifting type reactor, temperature of reaction is 45 DEG C, reactor pressure control 0.60MPa.Measuring result after reaction: emulsion pH value is 8.4, remaining ash content 0.4wt%, silicone content 0.46wt%.White mud calcium carbonate after ageing is pulverized through sand mill, drying machine is dry, obtains white mud calcium carbonate product.White mud calcium carbonate obviously becomes neat and well spaced in its particle surface shape of high power Microscopic observation.
Embodiment 9
The white clay that causticizing plant comes, the white mud calcium carbonate concentration after pre-hung machine washing is washed is 40% ~ 70%, and dilute with water, adjusts to concentration 30wt%(solid content), measuring its residual ash content is 5.0wt%, and silicone content is 2.9wt%, and pH value is more than 12.High-pureness carbon dioxide is passed into white mud calcium carbonate emulsion, react and stir 90 minutes, pH value is determined as 6.70, and then send into high pressure flow lifting type reactor, stirring reaction in high pressure flow lifting type reactor, temperature of reaction is 45 DEG C, reactor pressure control 0.70MPa.Measuring result after reaction: emulsion pH value is 8.2, remaining ash content 0.37wt%, silicone content 0.44wt%.White mud calcium carbonate after ageing is pulverized through sand mill, drying machine is dry, obtains white mud calcium carbonate product.White mud calcium carbonate obviously becomes neat and well spaced in its particle surface shape of high power Microscopic observation.
Embodiment 10
The white clay that causticizing plant comes, the white mud calcium carbonate concentration after pre-hung machine washing is washed is 40% ~ 70%, and dilute with water, adjusts to concentration 30wt%(solid content), measuring its residual ash content is 5.0wt%, and silicone content is 2.9wt%, and pH value is more than 12.Add 0.1%(in emulsion after the adjustment relative to solid content) Sodium hexametaphosphate 99, stir.High-pureness carbon dioxide is passed into white mud calcium carbonate emulsion, react and stir 90 minutes, pH value is determined as 6.71, and then send into high pressure flow lifting type reactor, stirring reaction in high pressure flow lifting type reactor, temperature of reaction is 45 DEG C, reactor pressure control 0.70MPa.Measuring result after reaction: emulsion pH value is 8.0, remaining ash content 0.34wt%, silicone content 0.40wt%.White mud calcium carbonate after ageing is pulverized through sand mill, drying machine is dry, obtains white mud calcium carbonate product.White mud calcium carbonate obviously becomes neat and well spaced in its particle surface shape of high power Microscopic observation, and granule crystal spindle-type and rectangle ratio improve.
Embodiment 11
The white clay that causticizing plant comes, the white mud calcium carbonate concentration after pre-hung machine washing is washed is 40% ~ 70%, and dilute with water, adjusts to concentration 30wt%(solid content), measuring its residual ash content is 5.0wt%, and silicone content is 2.9wt%, and pH value is more than 12.Add 0.5%(in emulsion after the adjustment relative to solid content) Sodium hexametaphosphate 99, stir.Then send into high pressure flow lifting type reactor, pH value is determined as 6.70, reacts and stirs 90 minutes, and temperature of reaction is 45 DEG C, reactor pressure control 0.80MPa.Measuring result after reaction: emulsion pH value is 8.0, remaining ash content 0.33wt%, silicone content 0.39wt%.White mud calcium carbonate after ageing is pulverized through sand mill, drying machine is dry, obtains white mud calcium carbonate product.White mud calcium carbonate obviously becomes neat and well spaced in its particle surface shape of high power Microscopic observation, and granule crystal spindle-type and rectangle ratio improve.
Comparative example 1
Be the white clay thin up of 40 ~ 70wt% by causticizing plant solid content after washing, obtain the white clay emulsion that solid content is 30wt%; Measuring its residual ash content is 5.0wt%, and silicone content is 2.9wt%, and pH value is more than 12.Common carborization is adopted to obtain white mud calcium carbonate.Measuring result after reaction: emulsion pH value is 9.5, remaining ash content 1.33wt%, silicone content 2.89wt%.White mud calcium carbonate after ageing is pulverized through sand mill, drying machine is dry, obtains white mud calcium carbonate product.White mud calcium carbonate is not obviously very even in its particle surface shape of high power Microscopic observation, and size distribution is wider, and the ratio of spindle-type and rectangle crystal is little.
Comparative example 2
Be the white clay thin up of 40 ~ 70wt% by causticizing plant solid content after washing, obtain the white clay emulsion that solid content is 30wt%; Measuring its residual ash content is 5.0wt%, and silicone content is 2.9wt%, and pH value is more than 12.Add 0.5%(in emulsion after the adjustment relative to solid content) Sodium hexametaphosphate 99, stir.Common carborization is adopted to obtain white mud calcium carbonate.Measuring result after reaction: emulsion pH value is 9.6, remaining ash content 1.32wt%, silicone content 2.9wt%.White mud calcium carbonate after ageing is pulverized through sand mill, drying machine is dry, obtains white mud calcium carbonate product.White mud calcium carbonate is not obviously very even in its particle surface shape of high power Microscopic observation, and size distribution is wider.
The test result of embodiment 1-7 is in table 1, and the test result of embodiment 8-11 and comparative example 1-2 is in table 2.
Fig. 1 is shown in technical process of the present invention.
Above-described embodiment is only and the present invention and enumerating is described, not for limiting the present invention, the structure of any effects equivalent converted based on the technical program, all belongs to protection scope of the present invention.
The test result of table 1 embodiment 1-7
The test result of table 2 embodiment 8-11 and comparative example 1-2
As can be seen from table 1, table 2, the calcium carbonate spindle body crystalline form that the calcium carbonate adopting treatment process of the present invention to obtain obtains than conventional carbon metallization processes and rectangle crystalline form content higher, be more conducive to the application of paper industry.
In table 1, table 2, product crystalline form content is measured by X diffraction approach.
Claims (10)
1. a treatment process for white mud calcium carbonate, in turn includes the following steps:
(1) be the white clay thin up of 40 ~ 70wt% by causticizing plant solid content after washing, obtain the white clay emulsion that solid content is 10 ~ 35wt%;
(2) high-pureness carbon dioxide is passed into white mud calcium carbonate emulsion, react and stir;
(3) then the mixed solution in step (2) is sent into high pressure flow lifting type reactor, continue react and stir;
(4) white mud calcium carbonate is in reactor overflow, flows into the ageing of white mud calcium carbonate digestion tank, and the white mud calcium carbonate after ageing is dry through sand mill pulverizing, drying machine, obtains white mud calcium carbonate product.
2. the treatment process of white mud calcium carbonate according to claim 1, wherein the solid content of the described white clay emulsion of step (1) is 20 ~ 30wt%.
3. the treatment process of white mud calcium carbonate according to claim 1, the reaction times wherein in step (2) is 45 ~ 90 minutes, and the purity of carbonic acid gas is preferably more than 85%, and reacted white mud calcium carbonate emulsion PH is less than 7.
4. the treatment process of white mud calcium carbonate according to claim 1, the pressure wherein in step (3) mesohigh flow lifting type reactor is 0.10 ~ 2.0MPa.
5. the treatment process of white mud calcium carbonate according to claim 1, the pressure wherein in step (3) mesohigh flow lifting type reactor is 0.2 ~ 1.5MPa.
6. the treatment process of white mud calcium carbonate according to claim 1, the temperature of reaction wherein in step (3) mesohigh flow lifting type reactor is 5-45 DEG C.
7. the treatment process of white mud calcium carbonate according to claim 1, the pressure wherein in step (3) mesohigh flow lifting type reactor is 0.3-1.0MPa, and temperature of reaction is 25-40 DEG C, and the reaction times is 45-90 minute.
8. the treatment process of white mud calcium carbonate according to claim 1, the pressure wherein in step (3) mesohigh flow lifting type reactor is 0.3MPa, and temperature of reaction is 30 DEG C, and the reaction times is 60 minutes.
9. the treatment process of white mud calcium carbonate according to claim 1, add Sodium hexametaphosphate 99 in the white clay emulsion of wherein step (1), add-on is the 0.1-0.6wt% of solid content.
10. the treatment process of white mud calcium carbonate according to claim 9, wherein the add-on of Sodium hexametaphosphate 99 is the 0.5wt% of solid content.
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|---|---|---|---|
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|---|---|---|---|---|
| CN114956145A (en) * | 2022-06-10 | 2022-08-30 | 重庆碳福森环保科技有限公司 | Method for preparing light calcium carbonate from papermaking white mud |
| CN116375072A (en) * | 2023-04-11 | 2023-07-04 | 重庆碳福森环保科技有限公司 | Method for producing modified calcium carbonate by aid method |
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Application publication date: 20150729 |