CN100369726C

CN100369726C - Desiliconizing treatment method for paddy stalk

Info

Publication number: CN100369726C
Application number: CNB2005100248614A
Authority: CN
Inventors: 龚挺
Original assignee: Shanghai Kangbai Environment Protection Science & Technology Co Ltd
Current assignee: SHANGHAI COMPAK ENVIRONMENTAL PROTECTION EQUIPMENT CO., LTD.
Priority date: 2005-04-04
Filing date: 2005-04-04
Publication date: 2008-02-20
Anticipated expiration: 2025-04-04
Also published as: CN1669753A

Abstract

The present invention relates to a desiliconizing treatment method for paddy stalks, which comprises the steps of hammering and kneading to paddy stalks. The present invention is characterized in that first, a paddy stalk is cut into small segments with the length of 80 to 150mm; second, the small segments of the cut paddy stalks are hammered and primarily crushed to have the length of 20 to 50mm; third, after fine impurities and dust in the primarily crushed paddy stalks are removed, the primarily crushed paddy stalks are further hammered and finely crushed into granules of 0.1 to 6mm; fourth, the granules are screened so as to separate impurities, such as grains, eustipes, silicide powder, etc., from the paddy stalk granules. The present invention has the advantage that the majority of silica in paddy stalks is removed with the present general-purpose equipment and lower energy consumption so that MDI gum sticking is suitable for making plates which is consistent with the strength standard of granule artificial plates.

Description

Desiliconizing treatment method for paddy stalk

Technical field

The invention relates to separation, particularly method about silicide being removed from paddy stalk with mechanical treatment.

Background technology:

Paddy stalk (being commonly called as straw) is since ancient times mainly as rural area fuel, farm cattle feed or return the usefulness of field fertilizer.But with the progress of science and technology and the development of society, rural area fuel is substituted by coal, biogas, liquefied gas and natural gas etc., and farm cattle have been eliminated by tractor, and the extensive use of using conveniently quick-acting again chemical fertilizer makes the straw of complicated operation return the field operation and do not re-use.Therefore a large amount of paddy stalks make smog boundless and indistinct usually by peasant's on-site incineration, atmosphere pollution, and especially the smog of road both sides burning paddy stalk is bigger to the traffic safety influence.In addition, the rise of building industry, demand to sheet material heightens, cause the forest reserves in the world to consume excessively, the substitute of timber is generally probed into by various countries, and the fiber that wherein utilizes the crop waste straw is a big hot topic, and the utilization of paddy stalk also is one of them, this not only finds a new purposes for paddy stalk, and is a good thing that helps improving environment, reduces pollution.Because paddy rice is different with the wheat planting mode, it is in whole growth process, absorbed than the more element silicon of wheat, except forming the silicrete on the straw surface, and be present in its cane with the silicide form, therefore use paddy stalk, when making wood-based plate, have a strong impact on its adhesion strength, can not reach the international quality standards requirement.At present, how that the siliceous technology report of removing from paddy rice is few, disclosed CN1263490A on August 16th, 2000 " manufacturing of glued board " application for a patent for invention, proposed a kind ofly with strong acid, highly basic or surfactant, or the aqueous medium that acid or alkali and surfactant mixtures constitute is removed the wax on crop straw surface or the method for silicrete.This method not only needs chemical agent consumption, but also has the environmental issue of wastewater treatment; In addition, its treatment effeciency is low, and time-consuming need are handled continuously up to wax or silicrete are fully removed, so that till the bonding generation of adhesive not being disturbed, as seen this method producing cost is big, the cycle is long, and effect is undesirable.The 10th phase of calendar year 2001 " forestry machinery and woodworking equipment " has been delivered " the several problems that should note in design of straw artificial board product line and the production " literary composition that Zhao Qi writes, think that the silicon dioxide film that wants to remove fully wheat straw, this class straw material surface of straw is impossible realize technically, available rubbing or the mode of hammering, silica membrane is effectively destroyed, can improve the adhesive effect of straw.This rubbing or hammering also promptly destroyed the initial configuration structure that wax and silicrete surround straw with high shear force, causes the filamentary generation of straw, and fiber is increased the adhesive contact probability, increased cohesive force.But the equipment of this high shear force is provided,, needs to consume a large amount of expensive energy as double screw extruder, disc type lapping machine, grater, beater grinder etc.And this article thinks and should use tup targetedly according to the characteristic of variety classes material that then effect is better.But rice straw is more pliable and tougher than wheat straw, uses the poor effect of hammering merely, and power consumption is very big.For this reason, up to the present, as yet cheapness is not arranged and the technology of effectively handling the paddy stalk desiliconization is made public.

Summary of the invention:

The object of the present invention is to provide a kind of desiliconizing treatment method for paddy stalk, solution with most of siliceous the removing in the paddy stalk, makes it be fit to conform with the manufacturing of MDI adhesive the technical problem of the sheet material of particle wood-based plate strength criterion with existing common apparatus and lower energy consumption.

The technical scheme that the present invention solves the problems of the technologies described above is:

A kind of desiliconizing treatment method for paddy stalk, comprise the paddy stalk hammering is crumpled, it is characterized in that: the segment that at first paddy stalk is cut into 80～150mm, the segment paddy stalk that second step will cut off just is broken to 20～50mm length with hammering, the 3rd step will just broken paddy stalk be removed the particle of further using hammering attritioning to 0.1～6mm behind the trickle impurity dirt, and the paddy stalk particle that the 4th step sieved attritioning separates with impurity such as grain, stipes, silicide powders.

Advantage of the present invention is as follows:

Consuming little energy is compared with general direct hammering, can reduce by 1/4～1/3 energy consumption.

Can use general general beater grinder, need not develop special-purpose tup.

Improved paddy stalk and binding agent binding ability, reduced the use amount of binding agent, only just can make the sheet material that meets the wood-based plate strength criterion, can save 1/3 left and right sides binding agent with the different hydrogen acid ether (hydrogen acid ester) adhesive of the MDI of straw thousandweight 4%.

Can make the paddy stalk of annual nearly hundred million tons of China obtain new outlet.

The specific embodiment:

The present invention at first is cut into the segment of 80～150mm with paddy stalk with chopper, cutter head type cutting machine or other cutting machine, and the paddy stalk segment that will cut off is then put into the hammer mill hammer and is broken to about 20～50mm.This preliminary hammer into shape in the broken process, the tup of disintegrating machine hits paddy stalk on the one hand and pulls apart, and crumples straw on the one hand, and the wax layer and the silicon layer of dirt that it is surperficial and part are rubbed with the hands.After again the paddy stalk of above-mentioned just broken 20～50mm left and right sides length being shaken off the trickle wax silicon layer and dirt of removal under wherein rubbing with the hands, put into the particle that hammer mill attritioning to 0.1～6mm water is little, in this attritioning process, paddy stalk is further rubbed scattered, and most of silicon grain in the straw is rubbed.Product with above-mentioned attritioning removes tiny silicide powder and impurity such as most of grain, stipes with the classifying screen sieve at last, can also further remove silicide powder residual in the straw particle and foreign material such as grain, stipes through seperator again.

Though through its surface of paddy stalk particle that the present invention handles also residual have a spot of siliceous, but itself and binding agent have good affinity, give full play to adhesive property, only use the MDI adhesive of straw thousandweight 4% just can produce and meet the sheet material that the wood-based plate strength criterion requires, compare with 6～7% conventional glue consumption, save 1/3 and have a surplus, thereby reduced product cost.

Claims

1. desiliconizing treatment method for paddy stalk, comprise the paddy stalk hammering is crumpled, it is characterized in that: the segment that at first paddy stalk is cut into 80～150mm, the segment paddy stalk that second step will cut off just is broken to 20～50mm length with hammering, the 3rd step will just broken paddy stalk be removed the particle of further using hammering attritioning to 0.1～6mm behind the trickle impurity dirt, and paddy stalk particle and grain, stipes, silicide powder impurity that the 4th step sieved attritioning are separated.