CN101492267B

CN101492267B - Method for producing high-efficiency concrete additive by using bark rich in tannic acid

Info

Publication number: CN101492267B
Application number: CN2009100428070A
Authority: CN
Inventors: 蒋新元; 万晓清
Original assignee: Central South University of Forestry and Technology
Current assignee: Central South University of Forestry and Technology
Priority date: 2009-03-06
Filing date: 2009-03-06
Publication date: 2011-08-10
Anticipated expiration: 2029-03-06
Also published as: CN101492267A

Abstract

The invention discloses a method for preparing a high-efficiency concrete admixture by using barks rich in tannin, which comprises the following steps: (1) crushing and screening the barks, namely crushing the barks into crushed aggregates of 0.5 to 20 millimeters; (2) leaching and modifying, namely adding water into a leaching pot according to the ratio of solid to liquid of between 1 to 4 and 1 to 6, heating the water and the crushed aggregates and controlling the temperature to between 70 and 120 DEG C, leaching the mixture for 5 to 12 times and 4 to 15 hours step by step by using 4 to 8 normal pressure pot groups, adding a composite modifier consisting of sodium sulfite and sodium bisulfite into the mixture, wherein the adding amount of the composite modifier is 6 to 30 percent of the quality of the barks; and (3) condensing and drying, namely preparing the mixture into powered solid to obtain the high-efficiency concrete admixture. The method not only solves the problem of waste of the barks of trees such as larch, myrica esculenta, black wattle, emblica, coast oak, spruce, eucalyptus, and the like rich in tannin, but also develops a new path for producing a concrete admixture product with high added value by using the barks of the trees such as the larch, the myrica esculenta, the black wattle, the emblica, the coast oak, the spruce, the eucalyptus, and the like.

Description

The method that the tannin bark prepares high-efficiency concrete additive is rich in utilization

Technical field

The present invention relates to a kind of utilization and be rich in the method that the bark of tannin is produced high-efficiency concrete additive.

Background technology

Tannin extract is traditional silvichemical, for containing the polyphenolic compound of multiple compositions such as tannin, xylogen and sugar, mainly from forestry waste such as the root of the plant of being rich in tannin, stem, leaf, shell, bark, extract, as barks such as tamarack, red bayberry, black wattle plant, emblic, Horsetail Beefwood, dragon spruce, eucalyptus, particularly the southern area forest reserves are abundanter in China.The main application that tannin extract is present: vegetable tanning agent, various tackiness agent, slurry thinner, water conditioner, gas sweetening agent, corrosion inhibitor for metal, ore floatation inhibitor, wood surface finishing agent, dye fixing agent, medicinal preparation, wherein, require tannin purity height during as medicinal preparation mainly as leather retanning agent.Though it is of many uses, but because many tannin extract extract costs are higher, purity is not enough, color is dark, sugar is many, add the deficiency on the performance, demand is atrophy gradually, and lower, the better performances of the price of petrochemical complex sintetics, the original market that has progressively replaced tannin extract, many tannin extracts manufacturing enterprise still descends in the enterprise that produces mostly also benefit at present near closing down or having closed down.Because the tannin extract product consumption reduces, the forestry waste major parts such as root, stem, leaf, shell, bark that are rich in the plant of tannin are used as fuel, and benefit is lower.For improving its performance, some institution of higher learning and enterprise have carried out a large amount of study on the modification work, and the modified product of the tannin extract that purity is higher is mainly used in leather retanning agent, but many products second-rate or that purity is not enough still lack market.Research tannin extract modification product innovation, open up new purposes the dependence that makes full use of forestry waste, reduce Nonrenewable resources is had positive meaning.

Along with social economy and science and technology development, construction industry and hydro project development are rapidly, the demand of concrete material is increasing, performance to the concrete each side has also proposed new requirement simultaneously, usually adopt the needs that satisfy the various performances of concrete with the method for concrete admixture, developed country uses the concrete of concrete admixture to account for more than 90% of concrete total amount, and China still has only the concrete admixture admixture about 40% at present, thereby be the needs that satisfy the development of China's engineering construction, must strengthen the research of China's concrete admixture energetically, produce and use.Wherein cement water reducing agent is a kind of of consumption maximum in the concrete admixture, the normal concrete water reducer mainly contains Sulfite lignin, the hydroxycarboxylic acid salt, many no alcohols, humic acids, tannin extract and waste residue extract etc. thereof, water-reducing rate is generally about 5%～8%, and time of coagulation is longer, and high efficiency water reducing agent is the fastest kind of development in recent years in the cement water reducing agent, high efficiency water reducing agent commonly used at present has modified lignin sulfonate, naphthalene sulfonic acidformaldehyde condensation product, sulfonated melamine water soluble resin etc., water-reducing rate is general all about 15%, and the water-reducing rate of amido sulfoacid series high-efficiency water reducer and polycarboxylic acid series high efficiency water reducing agent novel high-performance water reducer then reaches about 25%.Except that the modified lignin sulfonate water reducer from the renewable resources, all the other high efficiency water reducing agents all come from petrochemicals, because Nonrenewable resources such as oil is exhausted day by day, the price of this series products is surging gradually, utilizes renewable resources to produce high-efficiency concrete additive and has meanings such as important economy, society and environmental protection.

Summary of the invention

The method that the tannin bark prepares high-efficiency concrete additive is rich in the utilization that extractive substance applied range, the cost that technical problem to be solved by this invention provides a kind of production is lower, concrete water-reducing ratio is high and time of coagulation is short.

In order to solve the problems of the technologies described above, the method that the tannin bark prepares high-efficiency concrete additive is rich in utilization provided by the invention, adopts following steps:

(1) pulverizing of bark and screening: the bark that will be rich in tannin is broken into the particle of 0.5mm～20mmm with pulverizer with it, returns secondary greater than the particle of 20mm and pulverizes; (2) lixiviate and modification: the particle bark is put into the lixiviate jar, then in the lixiviate jar by solid-liquid mass ratio 1: (4～6) add water, the heating controlled temperature is 70～120 ℃, 4～8 normal pressure jar groups are used in lixiviate, lixiviate step by step, lixiviate 5～12 times, extraction time is 4～15h, add the composite modifier of being made up of S-WAT and sodium bisulfite in the lixiviate jar, the composite modifier addition is 6%～30% of a bark quality; (3) concentrate with dry: the vat liquor of gained earlier by evaporation concentration, is made powdery solid with concentrated solution by spray drying process again, high-efficiency concrete additive.

Adopt the utilization of technique scheme to be rich in the method that the tannin bark prepares high-efficiency concrete additive, adopt pulverizings-lixiviate to add methods such as modification-concentrated, significantly improve the sulfonation degree of extractive substance, usage quantity and result of use: can in cement, use separately, volume is 0.4%～1.0% in the cement, according to different needs, can with other high efficiency water reducing agent, air entrapment agents etc. are used, can be with concrete water-reducing ratio because 5～8% when unmodified brings up to 12～15%, its water-reducing rate reaches the standard of national efficient cement water reducing agent first grade, and cement initial set and final setting time prolong 1～4h and 3～8h than blank respectively.Major defect such as the present invention is based on that the common extractive substance range of application that original bark that is rich in tannin produces is narrow, concrete water-reducing ratio is low and time of coagulation is long, first primary study how effectively the common extractive substance that improves this type of bark of the method by modification to concrete diminishing dispersive ability and the method that shortens time of coagulation, for the concrete admixture product of this type of bark production high added value has been opened up new approach.The common extractive substance range of application that the invention solves this type of bark is narrow, cost is higher, to problems such as concrete diminishing dispersing property difference and time of coagulation are long, therefore, this invention will produce good economy, society and environmental benefit, having excellent popularization is worth, the bark such as the tamarack of being rich in tannin have not only been solved, red bayberry, black wattle plant, emblic, rubber Bowl, Horsetail Beefwood, dragon spruce, barks such as eucalyptus only act as a fuel or go out of use and common extractive substance dispersing property poor, cost is higher, the narrow problem that waits low value to utilize of range of application, and be tamarack, red bayberry, black wattle plant, emblic, Horsetail Beefwood, dragon spruce, the concrete admixture product of bark production high added values such as eucalyptus has been opened up new approach.Therefore, this invention will produce good economy and society benefit, have excellent popularization and be worth.

Embodiment

Below in conjunction with specific embodiment the present invention is described in further detail.

Embodiment 1:

(1) pulverizing and the screening of hair Cortex Myricae Rubrae: the hair Cortex Myricae Rubrae is broken into the particle of 2.0mm～20mm with pulverizer with it, carries out secondary greater than the particle of 20mm and pulverize;

(2) lixiviate of particle and modification: the hair Cortex Myricae Rubrae that will pulverize is put into the lixiviate jar, in the lixiviate jar, add water at 1: 4 then by the solid-liquid mass ratio, the heating controlled temperature is 120 ℃, 7 normal pressure jar groups are used in lixiviate, lixiviate step by step, lixiviate 10 times, extraction time is 12h, add the composite modifier of being made up of S-WAT and sodium bisulfite in the lixiviate jar, the composite modifier addition is 13% of a bark quality;

(3) concentrate with dry: the vat liquor of gained earlier by evaporation concentration, is made powdery solid with concentrated solution by methods such as spraying dryings again, high-efficiency concrete additive, can come into operation.

Embodiment 2:

(1) pulverizing of black wattle plant skin and screening: the black wattle plant skin is broken into the particle of 10mm～15mm with pulverizer with it, carries out secondary greater than the particle of 15mm and pulverize;

(2) lixiviate of particle and modification: the black wattle plant skin of pulverizing is put into the lixiviate jar, in the lixiviate jar, add water at 1: 6 then by the solid-liquid mass ratio, the heating controlled temperature is 100 ℃, 5 normal pressure jar groups are used in lixiviate, lixiviate step by step, lixiviate 7 times, extraction time is 8h, add the composite modifier of being made up of S-WAT and sodium bisulfite in the lixiviate jar, the composite modifier addition is 30% of a bark quality;

(3) drying: concentrate with dry: the vat liquor of gained earlier by evaporation concentration, is made powdery solid with concentrated solution by methods such as spraying dryings again, high-efficiency concrete additive, can come into operation.

Embodiment 3:

(1) pulverizing of bark of dahurian larch and screening: bark of dahurian larch is broken into the particle of 0.5mm～10mm with pulverizer with it, carries out secondary greater than the particle of 10mm and pulverize;

(2) lixiviate of particle and modification: the bark of dahurian larch of pulverizing is put into the lixiviate jar, in the lixiviate jar, add water at 1: 4 then by the solid-liquid mass ratio, the heating controlled temperature is 80 ℃, 8 normal pressure jar groups are used in lixiviate, lixiviate step by step, lixiviate 12 times, extraction time is 10h, add the composite modifier of being made up of S-WAT and sodium bisulfite in the lixiviate jar, the composite modifier addition is 6% of a bark quality;

Embodiment 4:

(1) pulverizing of emblic bark and screening: the emblic bark is broken into the particle of 2.0mm～20mm with pulverizer with it, carries out secondary greater than the particle of 20mm and pulverize;

(2) lixiviate of particle and modification: the emblic bark of pulverizing is put into the lixiviate jar, in the lixiviate jar, add water at 1: 5 then by the solid-liquid mass ratio, the heating controlled temperature is 90 ℃, 4 normal pressure jar groups are used in lixiviate, lixiviate step by step, lixiviate 5 times, extraction time is 15h, add the composite modifier of being made up of S-WAT and sodium bisulfite in the lixiviate jar, the composite modifier addition is 16% of a bark quality;

Embodiment 5:

(1) pulverizing of Horsetail Beefwood bark and screening: the Horsetail Beefwood bark is broken into the particle of 10mm～20mm with pulverizer with it, carries out secondary greater than the particle of 20mm and pulverize;

(2) lixiviate of particle and modification: the Horsetail Beefwood bark of pulverizing is put into the lixiviate jar, in the lixiviate jar, add water at 1: 4 then by the solid-liquid mass ratio, the heating controlled temperature is 100 ℃, 6 normal pressure jar groups are used in lixiviate, lixiviate step by step, lixiviate 9 times, extraction time is 12h, add the composite modifier of being made up of S-WAT and sodium bisulfite in the lixiviate jar, the composite modifier addition is 10% of a bark quality;

(3 concentrate with dry: the vat liquor of gained earlier by evaporation concentration, is made powdery solid with concentrated solution by methods such as spraying dryings again, high-efficiency concrete additive, can come into operation.

Embodiment 6:

(1) pulverizing of eucalyptus bark and screening: the eucalyptus bark is broken into the particle of 5mm～20mm with pulverizer with it, carries out secondary greater than the particle of 20mm and pulverize;

(2) lixiviate of particle and modification: the eucalyptus bark of pulverizing is put into the lixiviate jar, in the lixiviate jar, add water at 1: 6 then by the solid-liquid mass ratio, the heating controlled temperature is 70 ℃, 6 normal pressure jar groups are used in lixiviate, lixiviate step by step, lixiviate 10 times, extraction time is 9h, add the composite modifier of being made up of S-WAT and sodium bisulfite in the lixiviate jar, the composite modifier addition is 24% of a bark quality;

Claims

1. the method that the tannin bark prepares high-efficiency concrete additive is rich in a utilization, it is characterized in that: adopt following steps:

(1) pulverizing of bark and screening: the bark that will be rich in tannin is broken into the particle of 0.5mm～20mm with pulverizer with it;

(2) lixiviate and modification: the particle bark is put into the lixiviate jar, then in the lixiviate jar by solid-liquid mass ratio 1: (4～6) add water, the heating controlled temperature is 70～120 ℃, 4～8 normal pressure jar groups are used in lixiviate, lixiviate step by step, lixiviate 5～12 times, extraction time is 4～15h, add the composite modifier of being made up of S-WAT and sodium bisulfite in the lixiviate jar, the composite modifier addition is 6%～30% of a bark quality;

(3) concentrate with dry: the vat liquor of gained earlier by evaporation concentration, is made powdery solid with the concentrated solution drying again, high-efficiency concrete additive.