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

A technology of concrete admixture and bark, applied in solid waste removal, organic chemistry, etc., can solve problems such as lack of market, poor quality, and insufficient purity

Inactive Publication Date: 2009-07-29
CENTRAL SOUTH UNIVERSITY OF FORESTRY AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to improve its performance, some colleges and universities and enterprises have carried out a lot of modification research work. The modified products of tannin extract with higher purity are mainly used as leather tanning agents, but many products with poor quality or insufficient purity still lack the market

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0010] (1) Crushing and screening of Myrica tomentosa bark: the bark of Myrica tomentosa is broken into 2.0mm~20mm scraps with a pulverizer, and the scraps greater than 20mm are subjected to secondary crushing;

[0011] (2) Lixiviation and modification of scrap: put the pulverized Myrica tomentosa bark into the extraction tank, then add water in the extraction tank according to the solid-to-liquid mass ratio of 1:4, the heating control temperature is 120°C, and the extraction The extraction uses 7 normal pressure tank groups, leaching step by step, leaching 10 times, and the leaching time is 12h, adding a composite modifier composed of sodium sulfite and sodium bisulfite in the leaching tank, the amount of composite modifier 13% of bark mass;

[0012] (3) Concentration and drying: Concentrate the obtained extract by evaporation first, and then make the concentrated solution into a powdery solid by spray drying and other methods, which is a high-efficiency concrete admixture an...

Embodiment 2

[0014] (1) Crushing and screening of black wattle bark: the black wattle bark is crushed into 10mm-15mm scraps with a pulverizer, and secondary crushing is carried out for larger than 15mm scraps;

[0015] (2) Extraction and modification of scrap: put the pulverized black wattle bark into the extraction tank, then add water in the extraction tank according to the solid-to-liquid mass ratio of 1:6, heat and control the temperature to 100°C, and extract The extraction uses 5 normal pressure tank groups, leaching step by step, leaching 7 times, and the leaching time is 8h, adding a composite modifier composed of sodium sulfite and sodium bisulfite in the leaching tank, the amount of composite modifier 30% of bark mass;

[0016] (3) Drying: Concentration and drying: Concentrate the obtained extract by evaporation first, and then make the concentrated liquid into a powdery solid by spray drying and other methods, which is a high-efficiency concrete admixture and can be put into use...

Embodiment 3

[0018] (1) Crushing and screening of larch bark: the larch bark is crushed into 0.5mm-10mm fragments with a pulverizer, and the fragments greater than 10mm are subjected to secondary crushing;

[0019] (2) Extraction and modification of scraps: put the pulverized larch bark into the extraction tank, then add water in the extraction tank according to the solid-to-liquid mass ratio of 1:4, heat and control the temperature to 80°C, and extract Use 8 normal pressure tank groups, leaching step by step, leaching 12 times, leaching time is 10h, adds the compound modifier that is made up of sodium sulfite and sodium bisulfite in the leaching tank, and the compound modifier addition amount is 6% of bark mass;

[0020] (3) Concentration and drying: Concentrate the obtained extract by evaporation first, and then make the concentrated solution into a powdery solid by spray drying and other methods, which is a high-efficiency concrete admixture and can be put into use.

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PUM

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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

technical field [0001] The invention relates to a method for producing high-efficiency concrete admixture by using bark rich in tannin. Background technique [0002] Tannin extract is a traditional forestry chemical product, which is a polyphenolic compound containing tannin, lignin and sugar, etc. Extracted from waste, such as bark of larch, bayberry, black wattle, emblica, casuarina, spruce, eucalyptus, etc. China, especially the southern region, is rich in forest resources. Main uses of tannin extract: vegetable tanning agent, various adhesives, mud thinner, water treatment agent, gas desulfurizer, metal corrosion inhibitor, ore flotation inhibitor, wood surface finishing agent, dyeing and color fixing agent, medical use Tannins are mainly used as leather tanning agents, and high purity tannins are required when used as medical agents. Although it has a wide range of uses, due to the high cost, insufficient purity, darker color, high sugar content of many tannin extract...

Claims

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Application Information

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IPC IPC(8): C04B24/02B09B3/00C07G99/00
Inventor 蒋新元万晓清
Owner CENTRAL SOUTH UNIVERSITY OF FORESTRY AND TECHNOLOGY
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