CN104263861A - Method for preparing chrome tanning agent from chromium-containing wastewater concentrate in electroplating centralized control area - Google Patents

Method for preparing chrome tanning agent from chromium-containing wastewater concentrate in electroplating centralized control area Download PDF

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Publication number
CN104263861A
CN104263861A CN201410529940.XA CN201410529940A CN104263861A CN 104263861 A CN104263861 A CN 104263861A CN 201410529940 A CN201410529940 A CN 201410529940A CN 104263861 A CN104263861 A CN 104263861A
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solution
tanning agent
waste water
chrome tanning
impurity
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CN104263861B (en
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刘宏宇
方宏达
曾迪
陈少华
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Institute of Urban Environment of CAS
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Institute of Urban Environment of CAS
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    • C—CHEMISTRY; METALLURGY
    • C14—SKINS; HIDES; PELTS; LEATHER
    • C14C—CHEMICAL TREATMENT OF HIDES, SKINS OR LEATHER, e.g. TANNING, IMPREGNATING, FINISHING; APPARATUS THEREFOR; COMPOSITIONS FOR TANNING
    • C14C3/00—Tanning; Compositions for tanning
    • C14C3/02—Chemical tanning
    • C14C3/04—Mineral tanning
    • C14C3/06—Mineral tanning using chromium compounds

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Electroplating And Plating Baths Therefor (AREA)

Abstract

The invention discloses a method for preparing a chrome tanning agent from chromium-containing wastewater concentrate in an electroplating centralized control area, belongs to the field of water pollution control and resource recycling. The method comprises the following steps: adding a proper amount of sodium dichromate into the chromium-containing wastewater concentrate so as to enable the content of impurities in total dissolved solids (TDS) of the concentrate to be smaller than or equal to 20%; adding concentrated sulfuric acid; starting to heat; adding 15-22% of a glucose solution after the temperature of the solution in a reactor reaches 90-110 DEG C; on the basis that the time is controlled to be 10-60 s and the molar ratio of raw materials nH2SO4 to nNa2Cr2O7 to nC6H12O6 is 3:1:(0.275-3):1:0.325, supplementing 0.1-1.0 ml of sulfuric acid and 0.05-0.15 g of glucose per gram of the impurities; reacting for 30-80 min, adding a proper amount of sodium carbonate to adjust basicity, cooling, aging for 10-20 h, and drying at 65 DEG C to a constant weight.

Description

A kind of method utilizing electroplating concentrated control zone chromate waste water concentrated solution to prepare chrome tanning agent
Technical field
The invention belongs to water pollution control and resource recovery field, is the method utilizing electroplating concentrated control zone chromate waste water concentrated solution to prepare chrome tanning agent.
Background technology
Chromium is electroplating industry conventional plating agent, in electroplating process, can produce a large amount of containing chromium heavy metal wastewater thereby.Chromium mainly exists with the form of Cr (VI) in electroplating wastewater, and Cr (VI) has superpower toxicity to life entity, is strong epidermic cell stimulator.It can reduce the biochemical oxygen demand (BOD) of soil in the environment, and hinder the nitrifying process of nitrogen, make soil compaction, farm crop are withered, destroys the metabolism etc. of living organism.Meanwhile, chromium itself is again a kind of Nonrenewable resources, and the chromium resource shortage of China, and therefore, how effectively the chromium recycled in electroplating wastewater becomes the focus of concern gradually.
The method of traditional treatment of chromium containing wastewater first Cr (VI) is reduced to Cr (III), then add alkali and Cr (III) is precipitated remove.This method need add excess chemical medicament, produce a large amount of mud, and then produces the problem of secondary pollution, wastes chromium resource simultaneously.In order to solve chromium resource waste and chromium-bearing sludge secondary pollution problem, there is bibliographical information to utilize glucose to do reductive agent reduction waste electroplating liquor containing chromium and prepare the method for chrome tanning agent, but these methods are all the chromate waste waters discharged for single Electroplate Factory, in the waste water of single Electroplate Factory discharge dopant species fix, single, therefore lower to the requirement of preparation technology and less to the interference of product chrome tanning agent quality.And existing technique is comparatively extensive, the details such as feed way in technique and feed time node is controlled not, and do not pay close attention to impurity to the impact of glucose and sulfuric acid consumption and impurity to the impact of product quality.
But, along with the continuous enhancing of national environmental consciousness and the constantly strict of national environmental protection policies and regulations, Electroplate Factory's point is many and the situation of dispersion is no longer applicable to national Economic Development Status, the substitute is the appearance of modernization electroplating concentrated control zone, a large amount of Electroplate Factory concentrates in electroplating concentrated control zone, and the electroplating wastewater produced enters sewage work of Ji Kong district and focuses on.The chrome-plated process used due to Ge Jia Electroplate Factory is different, and plating agent form used and additive types difference, so the kind of impurity is complicated in the chromate waste water of electroplating concentrated control zone, concentration is changeable.Further, owing to implementing cleaner production, chromate waste water adsorbs Cr (VI) by ion exchange resins selective usually, and resin regeneration desorption obtains, and containing in chromium concentrated solution, not only chromium concn is high, and foreign matter content and kind also increase.Therefore, than single waste water from plating plant, the chrome tanning agent utilizing this kind of mixing Waste water concentrating liquid to prepare quality qualified is higher to processing requirement, for this feature, the present invention improves Reduction of Glucose technique, is mainly reflected in: the proportioning of the concentration of glucose feed time node, feed rate, glucose, sulfuric acid and water, impurity are to aspects such as the controls of glucose and sulfuric acid feeding quantity.
Summary of the invention
The object of the invention is to provide a kind of method utilizing electroplating concentrated control zone chromate waste water concentrated solution to prepare chrome tanning agent.
Described method is: by the electroplating concentrated control zone chromate waste water concentrated solution injecting reactor containing certain impurity, add appropriate sodium dichromate 99 wherein, make percentage composition≤20% of impurity in the total dissolved solid (TDS) of concentrated solution, open after stirring and add the vitriol oil, start heating, in question response device, solution reaches 95 ~ 110 DEG C, adds 15% ~ 22% glucose solution, add time controling at 10 ~ 60s, raw material adds at mol ratio n h2SO4: n na2Cr2O7: n c6H12O6on the basis of=3: 1: 0.275 ~ 3: 1: 0.325, every gram of impurity adds 0.1 ~ 1.0 ml sulfuric acid and 0.05 ~ 0.15 g glucose again.Add relief solution and fully react 30 ~ 80 min, after adding proper amount of sodium carbonate adjustment basicity according to following adjustment basicity formula, take out reaction solution, cooling, ageing 10 ~ 20 h is placed on 65 DEG C of drying in oven to constant weight, and measure Cr (VI), basic chromium sulfate content and basicity in product, result shows, can't detect Cr (VI) in product, basic chromium sulfate is (with Cr 2o 3meter) content and basicity all reach GB GBT 24331-2009 requirement.
The present invention draws on a large amount of experimental tests and literature survey analysis foundation, its critical process comprise following some:
(1) in concentrated solution, can foreign matter content affect Cr (VI) reduce completely and the key factor that in product chrome tanning agent, can effective constituent basic chromium sulfate content up to standard.On the one hand, the impurity in electroplating concentrated control zone chromate waste water concentrated solution can with sulfuric acid and glucose response.Therefore, in concentrated solution, impurity concentration can affect the dosage of sulfuric acid and glucose.On the other hand, the impurity in the chromate waste water concentrated solution of electroplating concentrated control zone can stay in the product when product drying, thus reduces the content of basic chromium sulfate in product.So, control the percentage composition of impurity in impurity concentration in concentrated solution and concentrated solution TDS, and the impurity determining in concentrated solution consumes how much sulfuric acid and glucose is can this technique prepare qualified chrome tanning agent completely critical craft by Cr (VI) reduction.By Theoretical Calculation and great many of experiments, we find that in concentrated solution, every gram of impurity consumes 0.1 ~ 1.0 ml sulfuric acid and 0.05 ~ 0.15 g glucose, and will obtain qualified product, the percentage composition of impurity also necessary≤20% in concentrated solution TDS.
The performance of product chrome tanning agent in pelts tanning process and its basicity closely related, too high or too low basicity is all unfavorable for the performance of its quality, therefore, how quick, accurate, suitable the basicity of adjustment product chrome tanning agent be the key factor obtaining high-quality product, and we propose and are suitable for the basicity that electroplating concentrated control zone Waste water concentrating liquid prepares chrome tanning agent and regulate formula on a large amount of experiment basis:
Sodium carbonate dosage=actual acid adding amount-acid consumption
Wherein, acid consumption=sodium dichromate 99 amount × (1.32-a)+b; A is the basicity that product will reach; B is the sulfuric acid amount that impurity consumes.
The method utilizing electroplating concentrated control zone chromate waste water concentrated solution to prepare chrome tanning agent provided by the present invention, has not only effectively processed electroplating concentrated control zone chromate waste water concentrated solution, and has produced qualified chrome tanning agent product, had significant environmental benefit and economic worth.
By great many of experiments we find Cr (VI) can be reduced completely and glucose feed time node, time length, feed way, glucose concentration etc. closely related, if control bad, even if the dosage of sulfuric acid and glucose substantially exceeds actual requirement, reaction still can not be carried out completely, and Cr (VI) residual in product chrome tanning agent can super GB limit value far away.Up to standard for guaranteeing Cr (VI), when answering that in question response device, solution reaches 90 ~ 110 DEG C, add 15% ~ 22% glucose solution, time controling is at 10 ~ 60s.
Embodiment
embodiment 1:
Be 28.0% by impurity percentage composition, impurity concentration is in the electroplating concentrated control zone chromate waste water concentrated solution injecting reactor of 21.5 g/L, adds 105g sodium dichromate 99 wherein, impurity percentage composition is adjusted to 17%, opens after stirring with adding the H with water volume ratio 1:1 2sO 4, start heating, in question response device, solution reaches 100 DEG C, and add 15% glucose solution, time controling is at 50s.Raw material adds at mol ratio n h2SO4: n na2Cr2O7: n c6H12O6on the basis of=3: 1: 0.275, impurity concentration is that the chrome liquor of 21.5 g/L often rises and need add 10 ml sulfuric acid and 2.1 g glucose more.Add relief solution and fully react 50 min, after adding 4.8g sodium carbonate adjustment basicity, take out reaction solution, cooling, ageing 10 h is placed on 65 DEG C of drying in oven to constant weight, and measure Cr (VI), basic chromium sulfate content and basicity in product, result shows, can't detect Cr (VI) in product, basic chromium sulfate is (with Cr 2o 3meter) content is 19.8%, basicity is 38.9%, reaches industrial solid chrome tanning agent index I grade standard.
embodiment 2:
Be 33.0% by impurity percentage composition, impurity concentration is in the electroplating concentrated control zone chromate waste water concentrated solution injecting reactor of 23.7 g/L, adds 134g sodium dichromate 99 wherein, impurity percentage composition is adjusted to 18%, opens after stirring with adding the H with water volume ratio 1:1 2sO 4, start heating, in question response device, solution reaches 95 DEG C, and add 15% glucose solution, time controling is at 40s.Raw material adds at mol ratio n h2SO4: n na2Cr2O7: n c6H12O6on the basis of=3: 1: 0.305, the chrome liquor of impurity concentration 23.7 g/L often rises to be needed to add 14 ml sulfuric acid and 2.7 g glucose more.Add relief solution and fully react 40 min, after adding 4.4g sodium carbonate adjustment basicity, take out reaction solution, cooling, ageing 10 h is placed on 65 DEG C of drying in oven to constant weight, and measure Cr (VI), basic chromium sulfate content and basicity in product, result shows, can't detect Cr (VI) in product, basic chromium sulfate is (with Cr 2o 3meter) content is 19.2%, basicity is 39.6%, reaches industrial solid chrome tanning agent index I grade standard.
embodiment 3:
Be 34.6% by impurity percentage composition, impurity concentration is in the electroplating concentrated control zone chromate waste water concentrated solution injecting reactor of 24.9 g/L, adds 121g sodium dichromate 99 wherein, impurity percentage composition is adjusted to 15%, opens after stirring with adding the H with water volume ratio 1:1 2sO 4, start heating, in question response device, solution reaches 110 DEG C, and add 15% glucose solution, time controling is at 30s.Raw material adds at mol ratio n h2SO4: n na2Cr2O7: n c6H12O6on the basis of=3: 1: 0.295, the chrome liquor of impurity concentration 24.9 g/L often rises to be needed to add 15 ml sulfuric acid and 2.8 g glucose more.Add relief solution and fully react 30 min, after adding 5.2 g sodium carbonate adjustment basicities, take out reaction solution, cooling, ageing 10 h is placed on 65 DEG C of drying in oven to constant weight, and measure Cr (VI), basic chromium sulfate content and basicity in product, result shows, can't detect Cr (VI) in product, basic chromium sulfate is (with Cr 2o 3meter) content is 19.1%, basicity is 40.1%, reaches industrial solid chrome tanning agent index I grade standard.
embodiment 4:
Be 40.9% by impurity percentage composition, impurity concentration is in the electroplating concentrated control zone chromate waste water concentrated solution injecting reactor of 26.7 g/L, adds 150g sodium dichromate 99 wherein, impurity percentage composition is adjusted to 19%, opens after stirring with adding the H with water volume ratio 1:1 2sO 4, start heating, in question response device, solution reaches 105 DEG C, and add 15% glucose solution, time controling is at 20s.Raw material adds at mol ratio n h2SO4: n na2Cr2O7: n c6H12O6on the basis of=3: 1: 0.285, the chrome liquor of impurity concentration 26.7 g/L often rises to be needed to add 16 ml sulfuric acid and 3.0 g glucose more.Add relief solution and fully react 60 min, after adding 4.5 g sodium carbonate adjustment basicities, take out reaction solution, cooling, ageing 10 h is placed on 65 DEG C of drying in oven to constant weight, and measure Cr (VI), basic chromium sulfate content and basicity in product, result shows, can't detect Cr (VI) in product, basic chromium sulfate is (with Cr 2o 3meter) content is 18.9%, basicity is 40.8%, reaches industrial solid chrome tanning agent index I grade standard.

Claims (10)

1. the present invention is a kind of method utilizing electroplating concentrated control zone chromate waste water concentrated solution to prepare chrome tanning agent, it is characterized in that described method is: by the electroplating concentrated control zone chromate waste water concentrated solution injecting reactor containing certain impurity, add appropriate sodium dichromate 99 wherein, make percentage composition≤20% of impurity in the total dissolved solid (TDS) of concentrated solution, open after stirring with adding the vitriol oil, start heating, in question response device, solution reaches 90 ~ 110 DEG C, add 15% ~ 22% glucose solution, time controling is at 10 ~ 60s, and raw material adds at mol ratio n h2SO4: n na2Cr2O7: n c6H12O6=3: 1: 0.275 to n h2SO4: n na2Cr2O7: n c6H12O6on the basis of=3: 1: 0.325, add 0.1 ~ 1.0 ml sulfuric acid and 0.05 ~ 0.15 g glucose according to every gram of impurity.
2. added relief solution and fully reacted 30 ~ 80 min, after adding proper amount of sodium carbonate adjustment basicity according to following formula, take out reaction solution, cooling, ageing 10 ~ 20 h is placed on 65 DEG C of drying in oven to constant weight.
3. sodium carbonate dosage=actual acid adding amount-acid consumption
Wherein, acid consumption=sodium dichromate 99 amount × (1.32-a)+b; A is the basicity that product will reach; B is the sulfuric acid amount that impurity consumes.
4. a kind of method utilizing electroplating concentrated control zone chromate waste water concentrated solution to prepare chrome tanning agent according to claim 1, is characterized in that described by adding appropriate sodium dichromate 99, making percentage composition≤20% of impurity in the total dissolved solid (TDS) of concentrated solution.
5. a kind of method utilizing electroplating concentrated control zone chromate waste water concentrated solution to prepare chrome tanning agent according to claim 1, is characterized in that the concentration of added glucose solution is 15% ~ 22%.
6. a kind of method utilizing electroplating concentrated control zone chromate waste water concentrated solution to prepare chrome tanning agent according to claim 1, is characterized in that the joining day of described glucose is that solution reaches after 90 ~ 110 DEG C in reactor.
7. a kind of method utilizing electroplating concentrated control zone chromate waste water concentrated solution to prepare chrome tanning agent according to claim 1, is characterized in that described glucose solution feed rate controls at 10 ~ 60s.
8. a kind of method utilizing electroplating concentrated control zone chromate waste water concentrated solution to prepare chrome tanning agent according to claim 1, is characterized in that described raw material adds at mol ratio n h2SO4: n na2Cr2O7: n c6H12O6on the basis of=3: 1: 0.275 ~ 3: 1: 0.325, every gram of impurity adds 0.1 ~ 1.0 ml sulfuric acid and 0.05 ~ 0.15 g glucose again.
9. a kind of method utilizing electroplating concentrated control zone chromate waste water concentrated solution to prepare chrome tanning agent according to claim 1, is characterized in that the reaction times that described raw material adds rear solution is 30 ~ 80 min.
10. a kind of method utilizing electroplating concentrated control zone chromate waste water concentrated solution to prepare chrome tanning agent according to claim 1, after adding proper amount of sodium carbonate adjustment basicity according to following formula described in it is characterized in that, take out reaction solution, cooling, ageing 10 ~ 20 h is placed on 65 DEG C of drying in oven to constant weight:
Sodium carbonate dosage=actual acid adding amount-acid consumption
Wherein, acid consumption=sodium dichromate 99 amount × (1.32-a)+b; A is the basicity that product will reach; B is the sulfuric acid amount that impurity consumes.
CN201410529940.XA 2014-10-10 A kind of method utilizing electroplating concentrated control zone chromate waste water concentrated solution to prepare chrome tanning agent Active CN104263861B (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105039607A (en) * 2015-07-14 2015-11-11 齐鲁工业大学 Method for preparing chrome tanning liquor with chitosan
CN105063252A (en) * 2015-07-20 2015-11-18 常州市好利莱光电科技有限公司 Method for producing chrome tanning agent through chrome in electroplating wastewater
CN106630008A (en) * 2016-03-22 2017-05-10 深圳前海中盛环保科技有限公司 Novel method for chrome tanning wastewater treatment and chrome recycling
CN108315509A (en) * 2018-01-23 2018-07-24 山东华升化工科技有限公司 The method for preparing chrome tanning agent using sodium dithionite

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US4168240A (en) * 1977-03-09 1979-09-18 Bayer Aktiengesellschaft Process for the preparation of a chrome tanning agent and Glauber's salt
EP0408097A1 (en) * 1989-07-10 1991-01-16 Institut National Polytechnique De Toulouse (I.N.P.T.) Tanning process of hides
CN102336487A (en) * 2011-08-29 2012-02-01 镇江吉盛皮业有限公司(中外合资) Method for recycling chromium sludge from waste liquor obtained through leather tanning

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4168240A (en) * 1977-03-09 1979-09-18 Bayer Aktiengesellschaft Process for the preparation of a chrome tanning agent and Glauber's salt
EP0408097A1 (en) * 1989-07-10 1991-01-16 Institut National Polytechnique De Toulouse (I.N.P.T.) Tanning process of hides
CN1049526A (en) * 1989-07-10 1991-02-27 图卢兹国立综合科技研究院 fur tanning method
CN102336487A (en) * 2011-08-29 2012-02-01 镇江吉盛皮业有限公司(中外合资) Method for recycling chromium sludge from waste liquor obtained through leather tanning

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105039607A (en) * 2015-07-14 2015-11-11 齐鲁工业大学 Method for preparing chrome tanning liquor with chitosan
CN105039607B (en) * 2015-07-14 2017-03-15 齐鲁工业大学 A kind of preparation method for preparing Chrome Tanning Liquor with shitosan
CN105063252A (en) * 2015-07-20 2015-11-18 常州市好利莱光电科技有限公司 Method for producing chrome tanning agent through chrome in electroplating wastewater
CN106630008A (en) * 2016-03-22 2017-05-10 深圳前海中盛环保科技有限公司 Novel method for chrome tanning wastewater treatment and chrome recycling
CN108315509A (en) * 2018-01-23 2018-07-24 山东华升化工科技有限公司 The method for preparing chrome tanning agent using sodium dithionite
CN108315509B (en) * 2018-01-23 2020-07-24 山东华升化工科技有限公司 Method for preparing chrome tanning agent by using sodium hydrosulfite

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