CN101270309B

CN101270309B - Preparation of slurries with primary slime and sodium lignosulfonic acid powder

Info

Publication number: CN101270309B
Application number: CN2008100952663A
Authority: CN
Inventors: 何敏; 黄俊发; 何秀院; 樊风仪; 黄建良; 黄桂英
Original assignee: Individual
Current assignee: Individual
Priority date: 2008-05-03
Filing date: 2008-05-03
Publication date: 2011-04-20
Anticipated expiration: 2028-05-03
Also published as: CN101270309A

Abstract

The invention relates to a method for preparing coal water slurry with primary slime and powdered sodium lignosulfonate. In the method, the primary slime is dispersed with a double shaft slime kneading agitator; a feeder is used to feed the materials with following weight percentage in the raw material: 58.5 to 60 percent of the primary slime and 1.5 to 2 percent of powdered sodium lignosulfonate to an intense agitation barrel; a flow pump pumps38 to 40 percent of papermaking waste water into the intense agitation barrel; the mixture starts to be agitated, and is secondarily dispersed and mixed before the mixture is filtered to remove foreign bodies; and a screw pump is used to feed the mixture filtered into a circulating tank for use. The invention comprehensively makes use of waste, thus conserving energy; and the manufacturing cost is low.

Description

Prepare coal water slurry with primary slime and sodium lignosulfonate powder

Affiliated technical field

The present invention relates to a kind of preparation method of coal water slurry, is that the middle-stage wastewater with primary slime and sodium lignosulfonate powder, wheat straw chemical pulping paper making by-product prepares the method for coal water slurry.

Background technology

Country's lay special stress on energy-saving and emission-reduction in recent years, economize on resources, protect environment, promote continuous development of society economy, coal water slurry is a kind of novel clean fuel, and the ortho-water coal slurry is made with raw coal, auxiliary agent and water, and cost is still higher.In the washing process of coal, a large amount of coal slimes of discharging after coal separation are difficult to handle, and the characteristics of coal slime are that granularity is little, viscosity is big, moisture is high, commodity value is low, and unstable under stacking states, meets water and easily runs off, air-dryly promptly flies upward, cause environmental pollution, stack coal slime simultaneously and taken a large amount of places.

A large amount of waste water serious pollution of ecological environment that the present wheat straw chemical pulping paper making of China is discharged cause the waste of the resources such as xylogen, humic acids, organic matter of a large amount of (account for raw material about 60%) simultaneously.According to statistical information in recent years, national annual pulping and paper-making consumes about 8,000 ten thousand tons of wheat straw resources, nearly 5,000 ten thousand tons of resources such as the xylogen of by-product, humic acids, organic matter; Annual 31.8 hundred million tons of the waste water that produce of pulping and paper-making cause environmental pollution.

Summary of the invention

The present invention is exactly at prior art problems, character according to coal slime and pulping back liquor waste water, utilize the effective ingredient in primary slime, sodium lignosulfonate powder and the wheat straw chemical pulping paper making by-product middle-stage wastewater, it is prepared from a kind of novel coal slime base flow fluid fuel by certain proportioning, it can replace raw coal, burns in different types of stove, reduces boiler operatiopn fuel cost, save energy, reach and eliminate slag, minimizing exhaust gas emission, improve the effect of efficiency of combustion; It can also utilize xylogen, humic acids, organic resource in the black liquor waste that pulping and paper-making produces, turns waste into wealth, turns harm into good, and reduces the discharging of waste water.

The technical solution adopted for the present invention to solve the technical problems is: utilize the coal separation tankage---coal slime does that base-material, 96% sodium lignosulfonate powder are done the dispersed activity agent, papermaking midcourse wastewater is made thinner, be prepared into coal water slurry by certain proportioning, can replace raw coal to act as a fuel.The coal water slurry of the present invention's preparation, its composition and weight percent thereof are: the primary slime 58.5%-60% of washing bituminous coal by-product, calculate with the weight after the oven dry; Sodium lignosulfonate powder 1.5%-2%, the sodium lignosulfonate powder is that the black liquor that produces of wheat straw chemical pulping paper making makes after by separation and Extraction, evaporation concentration, sulfonation acidifying, spraying drying, produced by Shanxi Hongchang Agricultural Trade Science Co., Ltd, solid content is 96%; The pulp washing middle section water 38%-40% of wheat straw chemical pulping paper making discharging, its technical indicator is: pH value 7-7.5, CODcr (mg/L) 320-450, BOD (mg/L) 60-100, SS (mg/L) 90-100.

The method for preparing coal water slurry with primary slime and sodium lignosulfonate powder realizes by following step: 1. primary slime is pinched the mud stirrer with twin shaft and disperse; 2. take by weighing primary slime with belt, send into strong stirring barrel through feeder; 3. the sodium lignosulfonate powder that takes by weighing is added strong stirring barrel; 4. with flow pump middle-stage wastewater is pumped into strong stirring barrel; 5. start strong stirring barrel, carry out the secondary dispersing and mixing; 6. filter impurity elimination; 7. sending into circulating tank with spiral pump stores in order to using.

The invention has the beneficial effects as follows and utilize the coal separation tankage---coal slime does that xylogen and humic acids in base-material, the pulping back liquor done the dispersed activity agent, papermaking midcourse wastewater is made thinner, can be with above three kinds of waste resource recovery utilizations, realization is turned waste into wealth, is turned harm into good, cleaner production, economize on resources, reduce " three wastes " discharging, and production cost is lower.According to measuring and calculating, the coal water slurry production cost with sodium lignosulfonate powder and primary slime preparation per ton is about 140 yuan, and the production cost of ortho-water coal slurry is about 280 yuan; Use coal water slurry of the present invention than burning raw coal energy efficient expense 40%-50%.

Embodiment

Pinch the mud stirrer with twin shaft and disperse deriving from the coal slime that produces behind coal separating plant's raw coal washing, take by weighing the primary slime that to account for whole raw material weight ratio be 58.5%-60% with belt, its weight is calculated to dry the back, and coal slime is sent into strong stirring barrel through feeder; Take by weighing and account for whole raw material weight ratio the sodium lignosulfonate powder that is 1.5%-2% and add strong stirring barrel; With flow pump the pulp washing middle-stage wastewater that the wheat straw chemical pulping paper making discharges is pumped into strong stirring barrel, it is 38%-40% that middle section water accounts for whole raw material weight ratio.Start strong stirring barrel, carry out the secondary dispersing and mixing, filter impurity elimination then, send into circulating tank with spiral pump at last and store with standby.The coal water slurry product of preparation is a black liquor fuel, concentration (solid content) about 60%, and granularity 1mm-2mm, viscosity 814-1221mPas, flowability is A level (continuous flow), stable 5-8 days.

Claims

1. coal water slurry with the preparation of primary slime and sodium lignosulfonate powder, the composition of coal water slurry and weight percent thereof are: the primary slime 58.5%-60% of washing bituminous coal by-product, sodium lignosulfonate powder 1.5%-2%, the pulp washing middle section water 38%-40% of wheat straw chemical pulping paper making discharging;

Wherein the sodium lignosulfonate powder is that the black liquor that produces of wheat straw chemical pulping paper making makes after by separation and Extraction, evaporation concentration, sulfonation acidifying, spraying drying;

Primary slime calculates with the weight after drying;

The technical indicator of middle section water is: pH value 7-7.5, CODcr (mg/L) 320-450, BOD (mg/L) 60-100, SS (mg/L) 90-100.

2. the method for preparing the described coal water slurry of claim 1, its preparation process is:

1. primary slime being pinched the mud stirrer with twin shaft disperses;

2. take by weighing primary slime with belt, send into strong stirring barrel through feeder;

3. the sodium lignosulfonate powder that takes by weighing is added strong stirring barrel;

4. with flow pump middle-stage wastewater is pumped into strong stirring barrel;

5. start strong stirring barrel, carry out the secondary dispersing and mixing;

6. filter impurity elimination;

7. sending into circulating tank with spiral pump stores with standby.