CN1152827C

CN1152827C - Process for treating waste mother liquid of H acid in dye factory

Info

Publication number: CN1152827C
Application number: CNB011122943A
Authority: CN
Inventors: 吴开祯; 肖宝清
Original assignee: Henan Zhongyuan Environment Protection Engineering Co Ltd
Current assignee: Henan Zhongyuan Environment Protection Engineering Co Ltd
Priority date: 2000-12-19
Filing date: 2001-04-05
Publication date: 2004-06-09
Anticipated expiration: 2021-04-05
Also published as: CN1313247A

Abstract

The present invention relates to a method for treating waste H acid mother liquor with high concentration for dye plants by a coal water slurry technique. Firstly, sodium sulfate in the waste H acid mother liquor is recovered. Then, coal and 3 to 40% of waste H acid mother liquor of which the sodium persulfate is recovered are prepared into coal water slurry according to the weight ratio of 1:8 to 2:1, and limestone is added in the coal water slurry. The pH value of the coal slurry is greater than or equal to 7, and the coal slurry is used for combusting boilers. The coal has the ash content of 1 to 65%, the volatile matter content of 15 to 40%, and the heat productivity is from 15 to 30 MJ/Kg. The prepared coil for combusting the boilers accounts for 10 to 70% of the total coal combustion amount of the boilers. When the coal proportion in the coal water slurry is not less than 50%, the coal water slurry can be singly combusted. The method has the advantages of little investment, low operation cost, safety, practicality, advanced technology, simple operation, easy implementation, etc., and can be popularized to all dye plants.

Description

Produce the improvement method of waste liquid when producing dyestuff intermediate

Technical field

The present invention relates to a kind of technology of utilizing the metabolic water coal slurry to the dye processing plant when producing dyestuff intermediate and be the single sodium salt of H acid, the single sodium salt waste liquid of H acid that produces (being called for short H acid waste liquor) is administered, and then makes the dye processing plant produce the improvement method of H acid waste liquor qualified discharge.

Background technology

China develops coal water slurry since nineteen eighty-two, through " six or five ", " the Seventh Five-Year Plan " tackling key problem, the popularization of " the Seventh Five-Year Plan ", " eight or five ", " 95 ", coal water slurry industrial preparation and combustion technology are very ripe at present, in kiln, Industrial Boiler, power station and the widespread use of chemical fertilizer system.By the end of the year 98, China has built up tens pulp mills, the millions of tons of year slurrying capacity.Therefore coal water slurry now has been a kind of clean fuel, have good mobility, stability, preparation cost is low, burnout rate is high characteristics, and the main at present dye processing plant that produces the single sodium salt of H acid, its waste water mainly results from H single sodium salt of acid and T acid isolation portion, belong to high density, supersalinity, organic wastewater with difficult degradation thereby, this organic waste water also is H acid waste liquor, and its main component is naphthalene, water, sulfuric acid, sodium sulfate, chromotropic acid, T acid etc.

Summary of the invention

The objective of the invention is to overcome the deficiencies in the prior art and provide a kind of and be raw material with the coal and be dispersion medium and dispersion agent that be prepared into coal water slurry, boiler of feeding uses, and reaches the method for treating wastewater that no H acid waste liquor discharges with H acid waste liquor.

The object of the present invention is achieved like this: at first, reclaim the sodium sulfate in the H acid waste liquor, then with coal with the solid content concentration that has reclaimed sodium sulfate be the H acid waste liquor of 3-40% according to weight ratio 1: 8-2: 1 scope is prepared into coal water slurry, add an amount of Wingdale simultaneously, make coal slurry pH value 〉=7, use for coal firing boiler, wherein coal employing the ash content of coal is 1-65%, fugitive constituent is 15-40%, and thermal value is 15-30MJ/Kg, during cool water mixture burning, still have in the boiler and join the burning coal, its ratio is the 10-70% of the total Coal-fired capacity of boiler, when the ratio of the coal in the coal water slurry greater than 50% the time, metabolic water coal slurry separately.Adopt the method that H acid waste liquor is cooled to normal temperature when reclaiming the sodium sulfate in the H acid waste liquor, treat that sulfate crystal is separated out after, adopt 1.5mm to sieve, the sour waste liquor of undersized H prepares coal water slurry with coal again.

The present invention has following positively effect:

1, directly with high concentrated organic wastewater, also be H acid waste liquor, its main component is naphthalene, water, sulfuric acid, sodium sulfate, chromotropic acid, T acid etc., being prepared into coal water slurry with coal, being used for boiler combustion, is to have utilized that to contain naphthalene in the H acid waste liquor be characteristics such as chemical additive, with the naphthalene in the high concentrated organic wastewater as slurries additive agent, wherein water can significantly reduce the cost of coal slurry raw material on the one hand as the dispersion medium of coal slurry, can significantly improve the utilization ratio of coal on the other hand.

2, this technology can adopt ordinary method to handle the most unmanageable high concentrated organic wastewater after early implement in full in the dye processing plant, will reduce the pollution load of full factory waste discharge greatly.

3, this technology is compared with the improvement technology that adopts biochemistry or physical treatment, has solved the latter when handling high concentrated organic wastewater, and investment is big, the problem that working cost is high, the subsequent disposal and the secondary pollution of having avoided producing a large amount of mud.

4, adopted the high effect cleaning coal water slurry fuel, can significantly reduce coal firing boiler, alleviated working strength of workers, improved Working environment atmospheric pollution.

5, because of containing a large amount of sodium sulfate in the H acid waste liquor, do not reclaim the waste that not only will cause resource, and in order to eliminate the influence of sodium sulfate to boiler combustion, in the coal water slurry preparation process, must add Wingdale, this will increase the manufacturing cost of coal water slurry, because of the sodium sulphate content height, to consume certain heat in the combustion processes, so reclaim(ed) sulfuric acid sodium helps the burning of boiler.

6, adopt part of sulfuric acid sodium to reclaim and COAL-WATER SLURRY TECHNOLOGY improvement H acid waste liquor, can reach completely consumed H acid waste liquor, realize H acid waste liquor " zero release ", use the organic waste water coal water slurry, its efficiency of combustion can reach more than 90%, improve 8% than using coal separately, and coal firing boiler uses the organic waste water coal water slurry, slag, fume amount and sulphur dioxide emission can reach environmental requirement, COAL-WATER SLURRY TECHNOLOGY is used for H acid waste liquor and administers, made full use of H acid waste liquor resource, having reduced environmental protection investments and working cost widely, be that other technology is incomparable, and working cost is low, the ton waste liquid is about 10 yuan, well below adopting conventional water technology ton waste liquid running cost (about 200 yuan).

Description of drawings

Fig. 1 is the process flow sheet of improvement method.

Embodiment

The invention will be further described below in conjunction with embodiment.

Embodiment 1: with calorific value is 22.67MJ/Kg, volatile matter 24.75%, the coal of ash content 63.42% and solid content are that 8% H acid waste liquor is to be mixed with into coal water slurry at 1: 2 by weight, join the burning coal and account for 40% of total Coal-fired capacity, add an amount of Wingdale simultaneously, make coal slurry pH value 〉=7, for example: H acid waste liquor is 2 ton hours, need coal to mix with it for 1 ton, join the burning coal and be about 0.67 ton, the technology of preparation black liquor pulp is identical with the Processes and apparatus of preparation coal water slurry in the prior art, difference is to have replaced water by H acid waste liquor, its concrete technology is as follows: raw coal adopts pulverizer as once pulverizing, pulverizing mill is pulverized as secondary, and secondary is pulverized and is adopted wet milling process, coal dust and H acid waste liquor are metered into pulverizing mill respectively, grind the powdered coal dust, and add an amount of Wingdale, make coal slurry pH value 〉=7, adopt stirring means in the pulping device, to be prepared into H acid waste liquor coal water slurry, appropriate proportioning by above-mentioned H acid waste liquor and coal, both can guarantee the trouble-free burning of coal slurry, guarantee boiler output, consume simultaneously H acid waste liquor again as much as possible, therefore with coal after H acid waste liquor is prepared into coal water slurry according to aforementioned proportion, the metabolic water coal slurry can be eliminated the pollution of H acid waste liquor.

The purpose of considering this technology is to eliminate the pollution of H acid waste liquor, require to consume as much as possible H acid waste liquor, therefore the ratio range of coal water slurry is wider, under the condition that guarantees heat balance and boiler output, add H acid waste liquor as much as possible, so the scope that the weight ratio of coal and black liquor is arranged between 1: 8 to 2: 1 all can in the present invention.Adopt the coal of above-mentioned thermal value, volatile matter and ash oontent, can prepare stable coal water slurry and solve slagging scorification scale formation in the burning.

The solid content of the used H acid of this technology waste liquor is between 3-40%, the H acid waste liquor of therefore being discharged in the actual production all can satisfy above-mentioned requirements, be prepared into coal water slurry after also can concentrating to it, also can be directly used in the preparation coal water slurry without concentrating, to simplify technological process greatly like this, save great amount of investment.

H acid waste liquor in the storage tank adds grinding machine by pump, pipeline, under meter, coal adds grinding machine by belt, material feeder simultaneously, the coal slurry that grinding machine grinds gets final product pulping by the pulping device, coal slurry in the pulping device is squeezed into colour strainer above the coal slurry storage tank by pump, to remove a spot of large coal particles grain, the coal slurry that removes behind the macrobead flows into the coal slurry storage tank, coal slurry in the coal slurry storage tank is again through pressurization, by burner and simultaneously the atomizing, air distribution, spray into boiler and use, this technological process is identical with coal water slurry process of the prior art.

Embodiment 2: with calorific value is 25.51MJ/Kg, volatile matter 18.02%, the coal of ash content 27.87% and solid content are that 10% H acid waste liquor is to be mixed with into coal water slurry at 3: 7 by weight, add an amount of Wingdale simultaneously, make coal slurry pH value 〉=7, the metabolic water coal slurry reaches eliminates the purpose that H acid waste liquor pollutes, and joins the burning coal and accounts for 35% of total Coal-fired capacity.If wherein H acid waste liquor has 7 tons, then need coal to mix with it for 3 tons, joining in the boiler burnt coal then needs 1.15 tons approximately, and concrete technology is identical with embodiment 1.

Embodiment 3: the employing calorific value is 25.51MJ/Kg, volatile matter 18.02%, the coal of ash content 27.87% and solid content are that 30% H acid waste liquor mixes, and the weight ratio of coal and the sour waste liquor of H is to prepare coal water slurry at 2: 1, adds an amount of Wingdale simultaneously, make coal slurry pH value 〉=7, if 1 ton of H acid waste liquor is arranged this moment, then need 2 tons of coals to mix with it, therefore metabolic water coal slurry separately, need not join the burning coal, concrete technology is identical with embodiment 1.

Embodiment 4: the employing calorific value is 22.67MJ/Kg, volatile matter 24.75%, the coal of ash content 63.42% and solid content are that 40% H acid waste liquor mixes, are to be prepared into coal water slurry at 1: 8 by coal and the sour waste liquor weight ratio of H, add an amount of Wingdale simultaneously, make coal slurry pH value 〉=7.At this moment, join the burning coal and account for 70% of total Coal-fired capacity, then need 1 ton coal with it to mix if any 8 tons of H acid waste liquors this moment, joins the burning coal and be about 2.3 tons.The technology of preparation H acid waste liquor coal slurry is identical with the Processes and apparatus of preparation coal water slurry in the prior art.

Claims

1, a kind of improvement method that produces waste liquid when producing dyestuff intermediate is characterized in that:

Sodium sulfate in a, the recovery H acid waste liquor,

B, with coal with the solid content concentration that reclaims Sodium Persulfate be the H acid waste liquor of 3-40% according to weight ratio 1: 8-2: 1 scope is prepared into coal water slurry, add an amount of Wingdale simultaneously, make coal slurry pH value 〉=7, use for coal firing boiler, wherein coal employing the ash content of coal is 1-65%, and fugitive constituent is 15-40%, thermal value is 15-30MJ/Kg, during cool water mixture burning, still have in the boiler and join the burning coal, its ratio is the 10-70% of the total Coal-fired capacity of boiler.

2, a kind of improvement method that produces waste liquid when producing dyestuff intermediate according to claim 1, it is characterized in that: when reclaiming the sodium sulfate in the H acid waste liquor, H acid waste liquor is cooled to normal temperature, after treating that sulfate crystal is separated out, adopt 1.5mm to sieve, remaining H acid waste liquor prepares coal water slurry with coal again.

3, a kind of improvement method that produces waste liquid when producing dyestuff intermediate according to claim 1 is characterized in that: when the ratio of the coal in the coal water slurry greater than 50% the time, metabolic water coal slurry separately.