CN1250123A - Black liquor treating and caustic soda recovering method for crop stalk pulping process - Google Patents

Black liquor treating and caustic soda recovering method for crop stalk pulping process Download PDF

Info

Publication number
CN1250123A
CN1250123A CN 99116830 CN99116830A CN1250123A CN 1250123 A CN1250123 A CN 1250123A CN 99116830 CN99116830 CN 99116830 CN 99116830 A CN99116830 A CN 99116830A CN 1250123 A CN1250123 A CN 1250123A
Authority
CN
China
Prior art keywords
black liquor
fed
lime
caustic soda
crop stalk
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CN 99116830
Other languages
Chinese (zh)
Other versions
CN1136358C (en
Inventor
李德宏
Original Assignee
李德宏
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 李德宏 filed Critical 李德宏
Priority to CNB991168305A priority Critical patent/CN1136358C/en
Publication of CN1250123A publication Critical patent/CN1250123A/en
Application granted granted Critical
Publication of CN1136358C publication Critical patent/CN1136358C/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Abstract

Concentrated black liquor and dilute washed black liquor are treated separately with lime water. Caustic soda obtained in the treatment of concentrated black liquor is recovered for reuse. Dilute caustic soda solution after the treatment of dilute washed black liquor is fed into one other reactor to add Mn to the power 7 and Mn to the power reagent to reduce chemical oxygen demand before returning to pulp-making inverse washing step or being neutralized for drainage. Compared with available technology, the present invention is simple and effective and can save great amount of washing water.

Description

Crop stalk is made black liquor processing and caustic soda recovery method in the pulping process
The present invention relates to alkali paper-making black liquor and handle and the caustic soda recovery method, relate in particular to crop stalk and make black liquor processing and caustic soda recovery method in the pulping process.
Pulp and paper industry is one of main industries of current domestic serious pollution of water environment, the main cause that causes this situation is because China's forest scarcity, non-wood material is abundant, quite a few pulping and papermaking industry is raw material with the dogstail, and most of dogstail slurry papermaking enterprise small scales, equipment is simple, the material consumption height, blowdown flow rate is big, again almost without any pullution controlling measure, the overwhelming majority alkali and the in line water body of organic pollution (COD), particularly in Huaihe River, Haihe basin, the situation that a river is polluted in paper mill happens occasionally.National alkaline straw-pulp output surpassed 3,400,000 tons in 1997, and a year alkali charge reaches 1,000,000 tons.And reclaim alkali number only about 8000 tons, produce organic pollution (COD) nearly 4,500,000 tons.
Purpose of the present invention is exactly to make black liquor processing and caustic soda recovery method in the pulping process for the defective that overcomes above-mentioned prior art existence provides a kind of crop stalk simple, that save investment.
Purpose of the present invention can be achieved through the following technical solutions:
A kind of crop stalk is made black liquor processing and caustic soda recovery method in the pulping process, it is characterized in that, it comprises following two steps: the first step, the concentrated black liquid of slurrying is fed in the mixing channel, feeding milk of lime then mixes, this mixed liquor is fed in the sedimentation separation groove again and separate, the clarification alkali lye that the upper strata obtains is sent into reuse after the adjustment concentration in the alkali lye storage tank by liquid pump, and lime mud calcium silicates that lower floor produces and lignin precipitation send incinerating kiln to burn to reclaim calcium oxide; Second step, rare black liquor of washing straw pulp is fed mixing channel, feeding milk of lime then mixes, again this mixed liquor is fed in the sedimentation separation groove and separate, lime mud calcium silicates that lower floor produces and lignin precipitation send incinerating kiln to burn to reclaim calcium oxide with step 1 equally, the diluted alkaline clarified solution that the upper strata obtains is sent into by liquid pump and is removed in the aerobic substance reactor, adds Mn to reactor simultaneously + 7, Mn + 6Reagent is to reduce the chemical aerobic substance in the diluted alkaline clarified solution, and reacted sig water can return slurrying countercurrent washing operation, and reacted sediment is Mn + 4, can further be oxidized to Mn + 7, Mn + 6The reagent reuse.
Compared with prior art, the present invention has the following advantages:
1. technology is simple, effect is obvious, crop stalk is different with timber, it contains more Si oxide, straw particularly, contain more silica, this material forms silicate in aqueous alkali, if black liquor adopts concentration mode in the past, sodium metasilicate can cause operational being the devil in Multi-effect Evaporation Processes.And the present invention utilizes the characteristic that contains more silicate in the straw pulp just, add an amount of milk of lime, silicate is combined with calcium ion, generate water-fast calcium silicates, this new life's calcium silicates particulate, have great specific surface and great adsorption capacity, macromolecular lignin is precipitated rapidly, black liquor is clarified fully.The liquid of this clarification has kept most caustic soda composition, can return in the pulping process after adjusting concentration and use.
2. can save a large amount of slurries, increase the chemical motive force of cleaning solution: the present invention is for rare black liquor that pulp washing produced, the method of taking to feed milk of lime equally makes the black liquor decolouring and clarifies, and resulting diluted alkaline clarified solution can return slurrying countercurrent washing system.This method is killing three birds with one stone, at first, can reduce slurry exponentially; The second, because of clarified solution has alkalescence, to surplus lignin and the leaching of silica, have stronger chemical motive force; The 3rd, improved the NaOH concentration of rare black liquor exponentially, remove lignin and silicate once handling with milk of lime again, can utilize its alkalescence preparation Mn + 7, Mn + 6Reagent and milk of lime etc., thus its economic worth improved.
3. can reduce chemical aerobic substance (COD), accomplish qualified discharge: the present invention adds " Mn in alkali lye + 7, Mn + 6Oxidant ", chemical pollutant is wherein further reduced, reach the COD index request, use CO again 2Neutralization makes liquid be the discharging of neutral back.Perhaps be used for absorbing the acidic materials of flue gas, send the sewage-farm discharging then.
Accompanying drawing is a process chart of the present invention.
The invention will be further described below in conjunction with embodiment.
Embodiment:
Obtain concentrated black liquid and two kinds of samples of rare black liquor in the pulp production, the first step: respectively get above-mentioned style 8cc and be positioned in the graduated test tube, drip milk of lime respectively by certain paper plant to obtain water white transparency clear liquid (caustic soda) degree of being; Add milk of lime 4cc in the concentrated black liquid, observe after one hour, the about 2cc of the beds of precipitation that pine is floating adds milk of lime 2cc in rare black liquor, observe the about 1cc of the beds of precipitation that pine is floating after one hour.In second step, use suction pipe sucking-off supernatant liquid (alkali lye) respectively, with rare KM nO 4Drop is gone into, and becomes green by purple rapidly, slowly disappears then, and dripping quantity is with purple disappearance degree of being, after 4 hours, yellowish-brown precipitates (M nO 2) make a decision in the test tube bottom, the two consumption difference is not obvious, and precipitation illustrate that the high oxide with manganese can make COD up to standard, and consumption is few all as thin as a wafer.The 3rd step is with above-mentioned yellowish-brown sediment (M nO 2) insert in the nickel crucible with 2: 1 (weight ratio) with NaOH, add water a little, make the NaOH dissolving, with MnO 2Transfer all, heating makes witheredly on low baking temperature, smashs to pieces and still is powder, reach about 400 ℃ in heating on the fire, stir with metal tube, and bubbling air, powder flowbility is very good, do not glue and be not stained with, after reaction in more than hour, slowly put cold, soluble in water, getting green solution is that sodium manganate generates, and it has had oxidisability, can use after demarcation.

Claims (1)

1. a crop stalk is made black liquor processing and caustic soda recovery method in the pulping process, it is characterized in that, it comprises following two steps: the first step, the concentrated black liquid of slurrying is fed in the mixing channel, feeding milk of lime then mixes, this mixed liquor is fed in the sedimentation separation groove again and separate, the alkali lye that the upper strata obtains is sent in the alkali lye storage tank and is reclaimed, and lime mud calcium silicates that lower floor produces and lignin precipitation send incinerating kiln to burn to reclaim calcium oxide; Second step, rare black liquor of washing straw pulp is fed mixing channel, feeding milk of lime then mixes, again this mixed liquor is fed in the sedimentation separation groove and separate, lime mud calcium silicates that lower floor produces and lignin precipitation send incinerating kiln to burn to reclaim calcium oxide with step 1 equally, the diluted alkaline clarified solution that the upper strata obtains feeds and removes in the aerobic substance reactor, adds Mn to reactor simultaneously + 7, Mn + 6Reagent is to reduce the chemical oxygen consumption thing in the diluted alkaline clarified solution, and reacted sig water can return slurrying countercurrent washing operation, and reacted sediment can further be oxidized to Mn + 7, Mn + 6The reagent reuse.
CNB991168305A 1999-09-02 1999-09-02 Black liquor treating and caustic soda recovering method for crop stalk pulping process Expired - Fee Related CN1136358C (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CNB991168305A CN1136358C (en) 1999-09-02 1999-09-02 Black liquor treating and caustic soda recovering method for crop stalk pulping process

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CNB991168305A CN1136358C (en) 1999-09-02 1999-09-02 Black liquor treating and caustic soda recovering method for crop stalk pulping process

Publications (2)

Publication Number Publication Date
CN1250123A true CN1250123A (en) 2000-04-12
CN1136358C CN1136358C (en) 2004-01-28

Family

ID=5279501

Family Applications (1)

Application Number Title Priority Date Filing Date
CNB991168305A Expired - Fee Related CN1136358C (en) 1999-09-02 1999-09-02 Black liquor treating and caustic soda recovering method for crop stalk pulping process

Country Status (1)

Country Link
CN (1) CN1136358C (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104060093A (en) * 2013-10-31 2014-09-24 攀钢集团攀枝花钢铁研究院有限公司 Treatment method of wastewater-neutralized gypsum tailing
CN109322202A (en) * 2018-09-30 2019-02-12 广西大学 A kind of new low concentration black liquor alkali by virtue

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104060093A (en) * 2013-10-31 2014-09-24 攀钢集团攀枝花钢铁研究院有限公司 Treatment method of wastewater-neutralized gypsum tailing
CN104060093B (en) * 2013-10-31 2016-02-17 攀钢集团攀枝花钢铁研究院有限公司 A kind for the treatment of process of waste water neutralize gypsum tailings
CN109322202A (en) * 2018-09-30 2019-02-12 广西大学 A kind of new low concentration black liquor alkali by virtue

Also Published As

Publication number Publication date
CN1136358C (en) 2004-01-28

Similar Documents

Publication Publication Date Title
CN102190309A (en) Method for lowering pH value of active calcium silicate
CN101817622B (en) Ozone pre-oxidation and laccase advanced water treatment method
CN107162273A (en) A kind of processing method of arsenic-containing waste water
CN103157437A (en) Filter aid and regeneration method thereof
CN100404434C (en) Method of dynamic treating sewage of papermaking to zero discharge standard and treatment agent
CN1136358C (en) Black liquor treating and caustic soda recovering method for crop stalk pulping process
CN110963634A (en) Advanced treatment method for papermaking wastewater
CN101519853B (en) Method for processing alkaline pulping black liquor in paper making process
CN1986458A (en) Carbide residue and waste water treating process
CN108975570A (en) A kind of device and method handling industrially desulfurized waste water using stack gases
CN100513312C (en) Method of extracting industrial anhydrous sodium sulfate from waste water in silicone dioxide production using precipitation method
CN108726727A (en) The processing method of cold rolling acid waste water and the application for being sintered semi-dry desulphurization ash
CN213357242U (en) Use cassava as high concentration organic wastewater processing apparatus of raw materials production alcohol
CN1814546B (en) Method for producing general superphosphate from waste water of yellow ginger processing by dry method
CN1150578A (en) Process for recovering alkali by red mud waste liquid film method
CN1041450C (en) Method for treating paper-making black liquor
CN110272177A (en) A kind of industrial park sewage plant biochemistry excess sludge decrement method and application
CN108529728A (en) A kind of dense media/oxidant coupling broken wall formula flocculant and its preparation method and application
CN203095747U (en) Device for treating waste water of bleaching powder concentrate secondary mother liquid
CN213012311U (en) Desulfurization waste water mud innocent treatment device
CN216303285U (en) System for utilize desulfurized gypsum preparation potassium sulfate
CN215049147U (en) Blast furnace gas alkali lye hydrogen sulfide removal waste water resource treatment device
CN1209294C (en) Quick flocculation method for black liquor of paper-making
CN107697998B (en) Based on Al3+Pretreatment method of internal source flocculation sloppy scram black liquor
CN100355655C (en) Process for producing white carbon black by using silicon sludge

Legal Events

Date Code Title Description
PB01 Publication
C06 Publication
SE01 Entry into force of request for substantive examination
C10 Entry into substantive examination
GR01 Patent grant
C14 Grant of patent or utility model
REG Reference to a national code

Ref country code: HK

Ref legal event code: GR

Ref document number: 1061625

Country of ref document: HK

CF01 Termination of patent right due to non-payment of annual fee
C19 Lapse of patent right due to non-payment of the annual fee