CN1635215A - Paper making mineral composite retention aid and preparing process and application thereof - Google Patents
Paper making mineral composite retention aid and preparing process and application thereof Download PDFInfo
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Abstract
The invention discloses a paper making mineral composite retention aid and preparation method and application thereof. The technical scheme is that: selecting and purifying bentonite, calcite, wollastonite, sepiolite, concave-convex stick earth, zeolite, talc and kaolin in the non-metallic ore, proportioning, loading into calciner, calcining, fragmenting and milling into super fine powder with fineness of 400~1200 meshes; adding acicular wollastonite powder and fibrous sepiolite in a certain scale, and stirring by the stirrer. The invention can be applied in preparation of regenerated paper. The invention has no chemical species, processes superpower adsorption and substitution function capable of reducing cost and protecting evironment.
Description
Technical field
The present invention relates to a kind of retention agent, the application of particularly a kind of paper making mineral composite retention agent that does not contain chemical reagent and preparation method thereof and this paper making mineral composite retention agent.
Background technology
Retention agent is one of requisite raw material of paper industry because of it has the chemicals effect of keeping filler and slight fiber, and it can reduce the loss of fine fibre in the paper pulp, reduces raw materials consumption, improves paper quality, thereby is widely used in the paper industry.But because the chemicals retention agent is liquid, soluble in water, and cost an arm and a leg, be used for the remaining harmful substance of waste water that paper technology produces, can not utilize once more, cause water consumption big, paper pulp cost height and the secondary pollution that environment is produced, must increase investment and administer, cost of sewage disposal is higher, and treatment effect is undesirable.Particularly in the preparation of recycled writing paper, will be because of it by the processing of several procedures in its technology, have 18% raw material at least with emitting in the tail water, emitting just becomes impurity, promptly causes the pollution to water quality that material loss is increased.In order to address the above problem, the precedent that has occurred utilizing the special performance of nonmetallic mineral material in paper industry, to use in recent years, as utilize acicular wollastonite or fibrous sepiolite or fine quality sodium bentonite and calcium-base bentonite or the like, but be the research that single mineral are used in paper industry, make and be used as elaboration as in three pieces of articles such as " Chinese papermaking " the 22nd phase in 2003 disclosed " application study of native microparticle retention and drainage system is moistened in the CPAM/ swelling " bentonite being made the papermaking microparticle retention aid; 1998 the 27th phases " papermaking of western river " " application of wollastonite in papermaking filler " delivered and for example; " the sepiolite new raw material papermaking research " delivered in the 3rd phase of calendar year 2001 " Tianjin papermaking ", these mineral materials are played reunion, are condensed into the effect of piece and discharge the remaining material in the paper-making industrial waste water to some extent.Yet, because single mineral self characteristics is limit, use as filler usually, also to mix use with chemical retention agent, in the paper industry, particularly the cost in the recycled writing paper production and the control of environmental pollution still can not get thorough solution.
Summary of the invention
The purpose of this invention is to provide a kind of paper making mineral composite retention agent that is composited by multiple non-metallic mineral powder material and preparation method thereof, and the application of this compound retention agent, this compound retention agent does not contain any chemical substance, can taste with discrimination retention agent by substituted chemistry, reduce the papermaking cost, solved control of environmental pollution problem in the paper effectively.
To achieve these goals, the technical solution used in the present invention is as follows: a kind of paper making mineral composite retention agent, it is characterized in that: it is mixed by the bentonite in the nonmetallic mineral, calcite, wollastonite, sepiolite, attapulgite, zeolite, talcum and kaolin basically, and the parts by weight proportioning of each ore is: bentonite 5-15 part, calcite 20-30 part, wollastonite 10-20 part, sepiolite 10-20 part, attapulgite 5-10 part, zeolite 5-15 part, talcum 5-10 part, kaolin 5-10 part.
Described bentonite, calcite, wollastonite, attapulgite, zeolite, talcum, kaolin and sepiolite are powder body material, and its fineness is the 400-1250 order.
Described sepiolite is a fibrous sepiolite, and described wollastonite is an acicular wollastonite, and its length is 5-10 μ m, and draw ratio is 20/1.
Second purpose of the present invention provides a kind of preparation method of paper making mineral composite retention agent, and it comprises following processing step:
1) bentonite in the non-metallic ore, calcite, wollastonite, sepiolite, attapulgite, zeolite, talcum and kaolin ore are carried out primary election, remove impurity, pulverizing and jevigating is a powder body material, and its fineness is the 400-1250 order;
2) powder body material of getting bentonite 5-15 part in the step 1), calcite 20-30 part, attapulgite 5-10 part, zeolite 5-15 part, talcum 5-10 part and kaolin 5-10 part mixes in proportion, send into mixer and stir and be mixed with the powder compound, its mixed preparing process using dry process preparation;
3) with step 2) mixture be fed into calcining furnace and calcine, its calcination time is 16-24 hour; Calcining heat is 1000-1200 ℃;
4) the compound fragmentation after the calcining of taking-up step 3) is milled and is that fine powder, its fineness are the 400-1200 order;
5) in the superfine powder that step 4) is mixed, set by step 2) ratio of weight and number of preparation powder body material adds needle-shaped wollastonite powder 10-20 part, fibrous sepiolite 10-20 part, stirs through mixer and makes described paper making mineral composite retention agent.
The 3rd purpose of the present invention provides a kind of application of above-mentioned paper making mineral composite retention agent on the preparation recycled writing paper that utilize.
Raw material combination of the present invention: mainly be optimization characteristics and other mineral assemblage of structural, the sepiolite of the carbonization that utilizes calcite, the adsorptivity of attapulgite, bentonitic lubricated friendship matter, wollastonite, constituted composite material.
Because this paper making mineral composite retention agent all adopts dry production, does not have water pollution; In whole process, its crushing system and other equipment all need add dust treatment plant and moisture preventive measure.
Because paper making mineral composite retention agent of the present invention is the dry powder shape, adds in the paper pulp and need even distribution could bring into play its absorption, cohesion, retention effect the biglyyest as retention agent.Therefore, with homogenizer its mixture is stirred just and can use.Under the constant situation of original equipment, technology, can in the process that paper pulp stirs, drop into this paper making mineral composite retention agent for production line with paper pulp agitating procedure, but to suitably dilute the concentration of paper making mineral composite retention agent, make the concentration of this paper making mineral composite retention agent and pulp density suitable.Can in pulping process, directly throw in for the production line that does not have the paper pulp agitating procedure.This paper making mineral composite retention agent total input must be controlled at the body paper total amount 15% in.
Described paper making mineral composite retention agent is being done the time spent, must throw in production procedure in proportion, needs before the use to add to add in the paper technology after water stirs into a paste again.
The present invention adopts above technical scheme, and its beneficial effect is as follows:
1. the property of utilizing multiple nonmetallic mineral to be had separately, its combinations produce is become a kind of paper making mineral composite retention agent with combination property, as the mineral such as bentonite, zeolite, attapulgite and calcite that add, with extremely strong suction-operated with the fiber fines in the paper pulp reunite, retention is in paper pulp, both avoided the loss of fiber, also reduce the input of paper pulp raw material, reduced the consumption of paper pulp; And for example added the fibrous sepiolite powder, the acicular wollastonite powder of high length-diameter ratio, alternative part paper pulp is saved the paper pulp more than 15%; Especially in the production of recycled writing paper, the cohesion of utilizing this paper making mineral composite retention agent to have, waste residue, mud and the useless husky cohesion that originally must discharge can be got up participate in paper-making process, enter the paper composition, greatly reduce the discharging of waste sludge from paper mill, its waste residue not only no longer needs local landfill, produce secondary pollution, and can carry out reuse, its proportioning can account for about 30% of wastepaper as raw material, both can further reduce cost, reduce the use of living resources and the pollution of environment again.
2. the water quality of making low tail water is improved, improved water-saving result
Adopt the paper making mineral composite retention agent of feedstock production of the present invention, the fiber in the papermaking tail water is reduced, the suspended matter value in the degradation water of tail water (SS value) reduces greatly, and COD (COD value) reduces, and reducing phosphorous, nitrogenous ratio has positive effect; Stink in absorption, the decomposition tail water; Water quality be improved significantly after can recycle repeatedly, can save a large amount of new water, reduce to 20 tons of paper water consumptions per ton by 60 tons of paper water consumptions per ton.
3. improve the fibre structure of paper pulp, improve paper quality
Enhancing, tension and filling effect that this paper making mineral composite retention agent product has are put in the paper pulp, can improve the fibre structure of paper pulp, the ring crush index of balance paper and cross directional tensile, increase paper fineness, flatness, improve whiteness, improve the quality;
4. technology is simple, easy operating, and no dust pollution, cost reduces
The paper making mineral composite retention agent that is mixed by multiple nonmetallic ore powder body material provided by the invention all adopts dry production, does not have water pollution; Crushing system all adopts bag collection, no dust pollution, substitute the chemical liquid retention agent that present Global Access is used with the nonmetallic ore superfines that has absorption, reunites simultaneously, no waste water, the waste sludge discharge realized, reduced exhaust gas discharging, can fundamentally solve paper-making industry pollution control, to have reduced the use amount of waste paper nearly 30%, and the use price of this product is significantly less than waste paper.
Description of drawings
Fig. 1 is a recycled writing paper papermaking process flow schematic diagram of the present invention.
The specific embodiment
The realization of technical solution of the present invention is illustrated by following specific embodiment
Embodiment one
Adopt following processing step to prepare paper making mineral composite retention agent of the present invention:
1) according to the customer requirement purification of selecting materials: carry out bentonite, calcite, attapulgite, zeolite, talcum, kaolin selected, remove impurity, be finely ground to powdery by hand, its fineness is respectively bentonite 1250 orders, calcite 400 orders, attapulgite 800 orders, zeolite 800 orders, talcum 400 orders, kaolin 1250 purpose powder body materials;
2) preparation: the powder body material of getting step 1) mixes in proportion, wherein: after 15 parts of bentonites, 20 parts in calcite, 10 parts of attapulgites, 5 parts in zeolite, 10 parts in talcum, 5 parts of mixing of kaolin, be fed in the homogenizer and stir;
3) mixed powder calcining: with step 2) is fed into the calcining furnace of the brick kiln of 8*26 and calcines, and its calcination time is 24 hours; Calcining heat is 1000 ℃;
4) material through the step 3) calcining drops into fragmentation in the jaw crusher, grinds to form superfine powdery material through Raymond mill, and its fineness is 1200 orders;
5) in the step 4) superfine powdery material, set by step 2) to add draw ratio be 20/1 to the ratio of weight and number of preparation powder body material, length is 10 parts of 20 parts of the acicular powder wollastonites of 5 μ m, fibrous sepiolites, is stirred into described paper making mineral composite retention agent with described superfine powdery material through mixer.
The whole dry production of above-mentioned procedure of processing do not have water pollution; Crushing system all adopts bag collection, no dust pollution, the chemical liquid retention agent of using with the alternative present Global Access of the nonmetallic ore superfines that has absorption, reunites simultaneously, can fundamentally solve paper-making industry pollution control, reduced the use amount of waste paper.
Embodiment two
Prepare paper making mineral composite retention agent of the present invention, its concrete steps and embodiment one are basic identical, and institute's difference is the fineness requirement difference of proportion scale, calcination time, calcining heat and powder:
One apolegamy raw material, basic identical with embodiment one, its difference is in the grinding fineness of each mineral to be matched according to customer requirement: choosing bentonite is that 800 orders, calcite are 1000 orders, attapulgite 400 orders, zeolite 400 orders, talcum 1250 orders, kaolin 400 purpose powder body materials;
Its two preparation, the powder body material of getting step 1) mixes in proportion, wherein: after 5 parts of bentonites, 30 parts in calcite, 5 parts of attapulgites, 15 parts in zeolite, 5 parts in talcum, 10 parts of mixing of kaolin, be fed in the homogenizer and stir;
Its three calcination time is 16 hours; Calcining heat is 1200 ℃;
Its four material through the step 3) calcining drops in the jaw crusher broken, grinds to form the superfine powdery material mixture through Raymond mill, and its fineness is 800 orders;
It is five in the step 4) superfine powdery material, set by step 2) to add draw ratio be 20/1 to the ratio of weight and number of preparation powder body material, length is 20 parts of 10 parts of the acicular powder wollastonites of 10 μ m, fibrous sepiolites, is stirred into compound retention agent with described superfine powdery material through mixer.
Above-mentioned procedure of processing is with embodiment one.
Embodiment three
Prepare paper making mineral composite retention agent of the present invention, its concrete steps and embodiment one are basic identical, and institute's difference is the fineness requirement difference of proportion scale, calcination time, calcining heat and powder:
One apolegamy raw material, basic identical with embodiment one, its difference is in the grinding fineness of each mineral to be matched according to customer requirement: choosing bentonite is that 400 orders, calcite are 1250 orders, attapulgite 1000 orders, zeolite 1250 orders, talcum 800 orders, kaolin 800 purpose powder body materials;
Its two preparation, the powder body material of getting step 1) mixes in proportion, wherein: after 10 parts of bentonites, 25 parts in calcite, 8 parts of attapulgites, 10 parts in zeolite, 8 parts in talcum, 8 parts of mixing of kaolin, be fed in the homogenizer and stir;
Its three calcination time is 20 hours; Calcining heat is 1100 ℃;
Its four material through the step 3) calcining drops in the jaw crusher broken, grinds to form superfine powdery material through Raymond mill, and its fineness is 4800 orders;
It is five in the step 4) superfine powdery material, set by step 2) to add draw ratio be 20/1 to the ratio of weight and number of preparation powder body material, length is 15 parts of 15 parts of the acicular powder wollastonites of 8 μ m, fibrous sepiolites, is stirred into compound retention agent with described superfine powdery material through mixer.
Above-mentioned procedure of processing is with embodiment one.
Embodiment four
The paper making mineral composite retention agent is applied to the preparation of recycled writing paper, and its technological process as shown in Figure 1.
Choose the foregoing description one to the paper making mineral composite retention agent of implementing three each method preparations, be fed in the recycled writing paper production technology.
Feeding mode is decided according to the selection of paper mill recycled writing paper stirring technique, and a kind of is in the pusher technology that stirs, and in the waste paper troughing during comminuting matter, the paper making mineral composite retention agent 15% of the present invention's preparation directly is fed in the waste paper troughing; Second kind is under direct stirring state, adds the paper making mineral composite retention agent 15% of the present invention's preparation in the secondary stirring stock tank; Above-mentioned two kinds of feeding modes all will be processed into recycled writing paper through existing paper technology, the paper surface of this recycled writing paper is smooth smooth, the uniformity improves, fiber fines is rare in the plain boiled water, it is bigger that quality index is improved, and the ring that the ring pressure ratio that the production of recycled writing paper adds this compound retention agent does not add this compound retention agent is pressed and improved more than 20%, and the folding pulling force improves more than 15%, vertically resistance to compression reaches 3.3, and breaking length reduces 18%; The paper quality of recycled writing paper and former paper quality-base are originally quite, some has also surpassed former paper, paper is improved at aspects such as quality, environmental protection, joint material, as use this paper making mineral composite retention agent in recycled writing paper technology after, the SS value has not reduced nearly 50% than throwing in the preceding SS value of this compound retention agent in the papermaking tail water; The COD value has not reduced nearly 30% than throwing in the preceding COD value of this compound retention agent; PH value is 7.13, satisfies national standard fully.
In order to guarantee that feeding mouth when adding paper making mineral composite retention agent of the present invention, can evenly add in proportion, need or stir stock tank feeding mouth place and install and deposit holder at the waste paper troughing; In addition, in the waste paper troughing, drop into this paper making mineral composite retention agent, can not be disposable qualified during production sewage disposal, need to do two stock tanks so that circular treatment at sewage draining exit, the clear water reuse, sediment is extracted mud out with slush pump and is made paper.
Above-mentioned compound retention agent is used for the production of recycled writing paper, requires this compound retention agent in paper pulp, evenly to distribute.Under the constant situation of former paper making equipment, paper technology, in the process that paper pulp stirs, drop into this compound retention agent, its compound retention agent thin up is diluted to the concentration that is similar to paper pulp; If there is not the production line of paper pulp agitating procedure, can in pulping process, directly throw in, the total input of this compound retention agent must be controlled at the body paper total amount 15% in.
According to incompletely statistics: national recycled writing paper production capacity has 1,200 ten thousand tons approximately, and the output value is about 24,000,000,000 yuan.If the ratio in 11.8% reduces cost, the whole nation can increase by 28.3 hundred million yuan of economic benefits in 1 year.The mineral new material calculates by 15% average addition, and only the expense in the recycled writing paper manufacturing is exactly 1,800,000 tons.Calculate by 1050 yuan of/ton sale prices, the whole nation can increase by hundred million yuan of GDP18.9, and the value-added tax rate by 13% calculates, and more country can levy taxes and receive 2.46 hundred million yuan.In addition, because this new material can adopt cycling use of water, but 40 tons of ton paper using water wisely, but 4.8 hundred million yuan of water rates are saved in 4.8 hundred million tons of 1,200 ten thousand tons of paper using water wisely.If also promote on newsprint, writing paper, art paper manufacturing, the economic benefit of this material is just more considerable.
The proportion of production of general recycled writing paper is that 1.28 tons of-1.42 tons of waste paper are made one ton of finished paper, use paper making mineral composite retention agent of the present invention, ratio in 15% is added back waste paper consumption can be reduced to the 0.98-1.15 ton, that is: whenever make one ton of finished paper and can reduce 300 kilograms of waste paper use amounts, by present 1000 yuan of/ton calculating of waste paper procurement price, cost-saved 300 yuan.And paper making mineral composite retention agent of the present invention is equal with the waste paper procurement price, but 15% addition needs only 150 yuan, and both offset, and can economize in raw materials and drop into 150 yuan.In addition: because the nonmetallic mineral that paper making mineral composite retention agent of the present invention uses is dry powder, neither there is loss, can save all expenses such as liquid retention agent, 300 kilograms of waste paper of processing and tail water processing again, this expense accounts for about 3% of comprehensive production cost, and absolute value is about 54 yuan.Producing one ton of finished paper cost-saved is 11.8%, thereby has remarkable economic efficiency and social benefit, benefits promotion and implementation.
Claims (7)
1. paper making mineral composite retention agent, it is characterized in that: it is mixed by the bentonite in the nonmetallic mineral, calcite, wollastonite, sepiolite, attapulgite, zeolite, talcum and kaolin basically, and the parts by weight proportioning of each ore is: bentonite 5-15 part, calcite 20-30 part, wollastonite 10-20 part, sepiolite 10-20 part, attapulgite 5-10 part, zeolite 5-15 part, talcum 5-10 part, kaolin 5-10 part.
2. paper making mineral composite retention agent according to claim 1 is characterized in that: described bentonite, calcite, wollastonite, attapulgite, zeolite, talcum, kaolin and sepiolite are powder body material, and its fineness is respectively the 400-1250 order.
3. paper making mineral composite retention agent according to claim 1 and 2 is characterized in that: described sepiolite is a fibrous sepiolite.
4. paper making mineral composite retention agent according to claim 1 and 2 is characterized in that: described wollastonite is an acicular wollastonite, and its length is 5-10 μ m, and draw ratio is 20/1.
5. the preparation method of a paper making mineral composite retention agent, it is characterized in that: it comprises following processing step:
1) bentonite in the non-metallic ore, calcite, wollastonite, sepiolite, attapulgite, zeolite, talcum and kaolin ore are carried out primary election, remove impurity, pulverizing and jevigating is a powder body material, and its fineness is the 400-1250 order;
2) powder body material of getting bentonite 5-15 part in the step 1), calcite 20-30 part, attapulgite 5-10 part, zeolite 5-15 part, talcum 5-10 part and kaolin 5-10 part mixes in proportion, sends into mixer and stirs and be mixed with the powder compound;
3) with step 2) mixture be fed into calcining furnace and calcine, its calcination time is 16-24 hour; Calcining heat is 1000-1200 ℃;
4) the compound fragmentation after the calcining of taking-up step 3) is milled and is that superfine powder, the fineness of its superfine powder are the 400-1200 order;
5) in the superfine powder that step 4) is mixed, set by step 2) ratio of weight and number of preparation powder body material adds needle-shaped wollastonite powder 10-20 part, fibrous sepiolite 10-20 part, stirs through mixer and makes described compound retention agent.
6. preparation method according to claim 5 is characterized in that: step 2) describedly be formulated as dry method preparation.
7. the application of each described paper making mineral composite retention agent of claim 1-6 on the preparation recycled writing paper.
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| CNB2004100496060A CN1323211C (en) | 2004-06-21 | 2004-06-21 | Paper making mineral composite retention aid and preparing process and application thereof |
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| CN101869823A (en) * | 2010-06-12 | 2010-10-27 | 傅桂云 | Composite material for removing peculiar smell of pet |
| CN102561105A (en) * | 2012-01-17 | 2012-07-11 | 盱眙中源新材料科技有限公司 | Cationic paper-making composite retention aid, as well as preparation method and application method thereof |
| CN102619130A (en) * | 2012-03-01 | 2012-08-01 | 浙江科技学院 | Heavy metal ion adsorption paper and preparation method thereof |
| CN109137621A (en) * | 2018-09-04 | 2019-01-04 | 江苏星光新材料科技有限公司 | A kind of ultra-high performance wearable paper |
| CN109667193A (en) * | 2019-01-28 | 2019-04-23 | 常州麒通国际贸易有限公司 | A kind of preparation method of composite papermaking retention agent |
| CN114457614A (en) * | 2022-01-25 | 2022-05-10 | 江西广源化工有限责任公司 | Composite filler and preparation method and application thereof |
| CN115418883A (en) * | 2022-10-08 | 2022-12-02 | 青阳县凯德超微钙业有限公司 | Recyclable composite inorganic mineral fiber reinforcing agent |
| CN115538212A (en) * | 2022-10-10 | 2022-12-30 | 青阳县凯德超微钙业有限公司 | Composite inorganic mineral fiber reinforcing agent and preparation process thereof |
| CN116163154A (en) * | 2022-11-14 | 2023-05-26 | 青阳县凯德超微钙业有限公司 | Environment-friendly composite inorganic mineral fiber reinforcing agent |
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| CN101182690B (en) * | 2007-12-14 | 2010-10-06 | 华南理工大学 | Inorganic silver-impregnated antibiotic zeolite microparticles retention agent, method of producing the same and applications |
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| US5071512A (en) * | 1988-06-24 | 1991-12-10 | Delta Chemicals, Inc. | Paper making using hectorite and cationic starch |
| AU729008B2 (en) * | 1996-05-01 | 2001-01-25 | Nalco Chemical Company | Improved papermaking process |
| FR2777918B1 (en) * | 1998-04-27 | 2000-06-23 | Rhodia Chimie Sa | PAPERMAKING PROCESS USING A NEW RETENTION SYSTEM INCLUDING BENTONITE AND A CATIONIC GALACTOMAN |
| KR20010074692A (en) * | 1998-07-10 | 2001-08-09 | 추후보정 | A microparticle system in the paper making process |
| CN1268810C (en) * | 2002-04-30 | 2006-08-09 | 加讯发展有限公司 | Filler composition, preparing method and use thereof |
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| CN101869823A (en) * | 2010-06-12 | 2010-10-27 | 傅桂云 | Composite material for removing peculiar smell of pet |
| CN101869823B (en) * | 2010-06-12 | 2012-05-30 | 傅桂云 | Composite material for removing peculiar smell of pet |
| CN102561105A (en) * | 2012-01-17 | 2012-07-11 | 盱眙中源新材料科技有限公司 | Cationic paper-making composite retention aid, as well as preparation method and application method thereof |
| CN102619130A (en) * | 2012-03-01 | 2012-08-01 | 浙江科技学院 | Heavy metal ion adsorption paper and preparation method thereof |
| CN102619130B (en) * | 2012-03-01 | 2015-06-24 | 浙江科技学院 | Heavy metal ion adsorption paper and preparation method thereof |
| CN109137621A (en) * | 2018-09-04 | 2019-01-04 | 江苏星光新材料科技有限公司 | A kind of ultra-high performance wearable paper |
| CN109667193A (en) * | 2019-01-28 | 2019-04-23 | 常州麒通国际贸易有限公司 | A kind of preparation method of composite papermaking retention agent |
| CN114457614A (en) * | 2022-01-25 | 2022-05-10 | 江西广源化工有限责任公司 | Composite filler and preparation method and application thereof |
| CN114457614B (en) * | 2022-01-25 | 2023-01-20 | 江西广源化工有限责任公司 | Composite filler and preparation method and application thereof |
| CN115418883A (en) * | 2022-10-08 | 2022-12-02 | 青阳县凯德超微钙业有限公司 | Recyclable composite inorganic mineral fiber reinforcing agent |
| CN115538212A (en) * | 2022-10-10 | 2022-12-30 | 青阳县凯德超微钙业有限公司 | Composite inorganic mineral fiber reinforcing agent and preparation process thereof |
| CN116163154A (en) * | 2022-11-14 | 2023-05-26 | 青阳县凯德超微钙业有限公司 | Environment-friendly composite inorganic mineral fiber reinforcing agent |
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