CN109626429A - A kind of comprehensive treatment utilization method of the spent acid containing chromium - Google Patents

A kind of comprehensive treatment utilization method of the spent acid containing chromium Download PDF

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Publication number
CN109626429A
CN109626429A CN201811497720.8A CN201811497720A CN109626429A CN 109626429 A CN109626429 A CN 109626429A CN 201811497720 A CN201811497720 A CN 201811497720A CN 109626429 A CN109626429 A CN 109626429A
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CN
China
Prior art keywords
acid
chromium
comprehensive treatment
value
filtrate
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CN201811497720.8A
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Chinese (zh)
Inventor
刘巍斌
居银栋
孙戎斐
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江苏永葆环保科技有限公司
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Priority to CN201811497720.8A priority Critical patent/CN109626429A/en
Publication of CN109626429A publication Critical patent/CN109626429A/en

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    • CCHEMISTRY; METALLURGY
    • C01INORGANIC CHEMISTRY
    • C01GCOMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
    • C01G37/00Compounds of chromium
    • C01G37/08Chromium sulfates
    • CCHEMISTRY; METALLURGY
    • C01INORGANIC CHEMISTRY
    • C01DCOMPOUNDS OF ALKALI METALS, i.e. LITHIUM, SODIUM, POTASSIUM, RUBIDIUM, CAESIUM, OR FRANCIUM
    • C01D5/00Sulfates or sulfites of sodium, potassium or alkali metals in general
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F9/00Multistage treatment of water, waste water, or sewage
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21BMANUFACTURE OF IRON OR STEEL
    • C21B15/00Other processes for the manufacture of iron from iron compounds
    • CCHEMISTRY; METALLURGY
    • C01INORGANIC CHEMISTRY
    • C01PINDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
    • C01P2006/00Physical properties of inorganic compounds
    • C01P2006/80Compositional purity
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00Treatment of water, waste water, or sewage
    • C02F1/001Processes for the treatment of water whereby the filtration technique is of importance
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00Treatment of water, waste water, or sewage
    • C02F1/02Treatment of water, waste water, or sewage by heating
    • C02F1/04Treatment of water, waste water, or sewage by heating by distillation or evaporation
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00Treatment of water, waste water, or sewage
    • C02F1/52Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
    • C02F1/5236Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents

Abstract

The invention discloses a kind of comprehensive treatment utilization methods of spent acid containing chromium.Contain sulfate radical and iron ion in the spent acid of this method processing, chromium spent acid pH value will be contained by, which including the following steps:, is adjusted to 1 ~ 3, and precipitation reaction, isolated ferrous precipitation and filtrate occur for acid adding and iron ion, and maintenance system pH value is 1 ~ 3 in sour adition process;By the cooling precipitated crystal of separating filtrate, sodium sulfate crystal and secondary filtrate is obtained by filtration;It is concentrated by evaporation secondary filtrate to obtain chromium sulfate.Processing method of the invention realizes the classification Resource recovery of acid, iron and chromium by gradually classification processing, avoid precipitated in existing processing method generation and resource that the secondary dangerous waste of bring is just burned after chromium recovery value it is not high the problems such as, the synthesis high value for realizing the spent acid containing chromium recycles, wherein the rate of recovery of iron is up to 95.0%, the rate of recovery of acid is up to 80.0%, the rate of recovery of chromium can be widely applied in the recovery processing of the spent acid containing chromium up to 90.5%.

Description

A kind of comprehensive treatment utilization method of the spent acid containing chromium

Technical field

The present invention relates to cold rolling or electroplating technology, the integrated treatment more particularly, to a kind of spent acid containing chromium is utilized Method.

Background technique

In cold rolling industry and other pickling industries, there is a large amount of stainless steel to need pickling processes, contain difference in steel The chromium of content enters in pickle liquor through pickling, if to comprehensively utilize these spent acid, it is necessary to chromium therein is separated, Otherwise subsequent use will be seriously affected.The minimizing technology of chromium, which mainly uses, in existing spent acid adds alkali (caustic soda or stone Ash) neutralize, by iron and chromium precipitating after filters pressing, dangerous waste filter cake burn, the disadvantages of this method are as follows: neutralize disposition need large quantities of lime and The sediment of caustic soda, formation is more, and filter cake remarketing is costly, while effective ingredient is not utilized very well.It is another The removing method of chromium is exactly direct progress incineration disposal in kind spent acid, directly burns the waste that will cause vast resources and the energy, Processing cost is too high, is unfavorable for actual dangerous waste processing, be easy to cause secondary secondary dangerous waste.It is also disclosed correlation in the prior art The method of Precipitation discloses in prior art CN106865729A and a kind of utilizes molten iron pretreatment desulfurizing Slag treatment weight containing chromium The method of metallic wastewater first selects the magnetic material in desulfurization slag using magnetic separation in this method, using magnetic material by hexavalent chrome reduction At trivalent chromium, iron tailings etc. is recycled to remove the trivalent chromium chemical precipitation of reduction treatment, the operation of this method is comparatively laborious, no Adapt to actual production processing.

Therefore, the comprehensive treatment utilization method of a kind of spent acid containing chromium provided by the invention, will using the method for clean and environmental protection Effective component therein recycles to form corresponding by-product, promotes comprehensive utilization value, and no secondary dangerous waste of correlation generates.

Summary of the invention

The technical problem to be solved by the present invention is to overcome the defects and deficiency of chromium minimizing technology in existing spent acid, provide one kind The comprehensive treatment utilization method of the spent acid containing chromium, this method are heavy by adjusting spent acid system pH and pH value of reaction system constant control Form sediment separation chromium ion, and reprecipitation crystallizes to obtain sodium sulphate product, and then filters concentrated acid and obtain chromium sulfate, entire integrated conduct method Easy to operate, no secondary dangerous waste generates, and realizes the high value comprehensive utilization of dangerous waste.

Above-mentioned purpose of the present invention is achieved through the following technical solutions:

A kind of comprehensive treatment utilization method of the spent acid containing chromium contains sulfate radical and iron ion in the spent acid, includes the following steps:

S1. it will contain chromium spent acid pH value and be adjusted to 1 ~ 3, precipitation reaction, isolated ferrous precipitation and filter occur for acid adding and iron ion Liquid, maintenance system pH value is 1 ~ 3 during acid adding;

S2. by the cooling precipitated crystal of above-mentioned separating filtrate, filtering dries in the shade to obtain sodium sulfate crystal and secondary filtrate;

S3. it is concentrated by evaporation above-mentioned secondary filtrate to obtain chromium sulfate.

Comprehensive reutilization method of the invention changes burning disposal or direct burning disposal after original Direct precipitation Processing method sediment is formed by chelated acid and iron to efficiently separate out iron ion by the way that sequestering power strong acid is added, Acid, ferrous iron and chromium ion in spent acid are comprehensively utilized, reduces the waste of resource, reduces disposal costs, is improved Economic value.

Chromium spent acid pH value will wherein be contained before acid adding be adjusted to 1 ~ 3 can accelerate iron ion and acid chelating production precipitating, make It obtains entirely to react and be carried out to positive reaction direction, improve the utilization rate of iron.System pH is control in the reaction of entire precipitation of iron ions Precipitation reaction equalization point processed realizes the key factor of iron efficiently separated, and maintenance system pH value is 1 ~ 3 in entire reaction system It is the Direction of Reaction to maintain iron precipitation reaction, accelerates positive reaction, improve the utilization rate of iron.

The cooling precipitated crystal generation sodium sulphate of separating filtrate, preferably 30 DEG C -35 DEG C of cooling temperature.

Above-mentioned filtering dries in the shade to obtain sodium sulfate crystal to be sulfate crystal object Na2SO4

It can reach 90% using the separation recovery efficiencies of the above-mentioned iron of preparation method of the invention, sour separation recovery efficiencies can Reach 80%, the separation recovery efficiencies of chromium are up to 90%.

Preferably, pH value described in S1 is adjusted to 1 ~ 2, and system pH maintains 1 ~ 3.Such as pH value be adjusted to 1,1.5 or 2, system pH maintains 1,1.5,2 or 3.

Preferably, the addition speed control of the precipitating of acid adding described in S1 is system pH >=0.5 after being added.According to acidity Speed is added in variation control, and the variation of excessive velocities acidity is too fast, and precipitating is too slow, and speed is too slow, and reaction efficiency is low.

Preferably, additional amount sour described in S1 is 1.05 ~ 1.2 times of the amount of the substance of iron ion.It such as can be 1.1 Or 1.2 times, sour additional amount control is conducive to control precipitation reaction speed, precipitates more complete.

Acid described in S1 is the mixed acid of citric acid, oxalic acid, acetic acid and EDTA, wherein citric acid, oxalic acid, acetic acid and EDTA The mass ratio of the material be 4.5 ~ 5.5:1.5 ~ 2.5:1:1.Preferably 5:2:1:1.

Preferably, the pH value of spent acid containing chromium described in S1 adjust use concentration for 10 ~ 20% lye.

Preferably, system pH is maintained by the way that lye is added dropwise in S1, and wherein the concentration of lye is 5 ~ 20%.Concentration of lye is too Height will affect acidity variation it is too fast, be unfavorable for the control of system pH, be easy to cause the acidity of precipitation reaction microbody system to change, shadow Ring whole sedimentation effect.

Preferably, precipitation reaction time described in S1 is 20 ~ 40min.

Preferably, the condensed water being concentrated by evaporation in S3 can be used as Treated sewage reusing.The condensed water of evaporation and concentration of the invention Particular content object is water and Determining Micro Acid, has the characteristics that middle water, can be used as Treated sewage reusing, realizes the totally enclosed type of spent acid ingredient It recycles, the generation without secondary dangerous waste, there is economic and environment-friendly treatment effect.

Comprehensive treatment utilization method of the invention can be used for handling chromium content in 0.5 ~ 1.0% iron content Waste Sulfuric Acid, recycle For the purity of the sodium sulphate arrived 94% or more, ferrous purity can reach 82% or more.

Compared with prior art, the beneficial effects of the present invention are:

The present invention provides a kind of comprehensive treatment utilization method of spent acid containing chromium, first presetting spent acid pH, acid adding are heavy in processing method Shallow lake iron ion, then gradually crystallisation by cooling recycles sulfuric acid content, crystallization filtrate is finally concentrated to get chromium sulfate, by being gradually classified Processing realizes the classification Resource recovery of acid, iron and chromium, avoids and burns bring after precipitating just chromium in existing processing method The generation of secondary dangerous waste and the recovery value of resource it is not high the problems such as, realize the spent acid containing chromium synthesis high value recycling benefit With wherein the rate of recovery of iron is up to 90%, and up to 80%, the rate of recovery of chromium can be widely applied to up to 90% containing chromium the sour rate of recovery In the recovery processing of spent acid.

Detailed description of the invention

Fig. 1 is comprehensive reutilization flow chart of the invention.

Specific embodiment

The present invention is further illustrated With reference to embodiment, but embodiment the present invention is not done it is any The restriction of form.Unless otherwise indicated, source chemicals used in the embodiment of the present invention are the source chemicals routinely bought.

The specific ingredient of the spent acid containing chromium in the embodiment of the present invention is as shown in table 1:

The main component and content of 1 spent acid containing chromium of table

Embodiment 1

A kind of comprehensive treatment utilization method of the spent acid containing chromium, as shown in Figure 1, including the following steps:

S1. it will contain chromium spent acid pH value and be adjusted to 1.5, precipitation reaction occurs for acid adding and iron ion, is stirred for 20min, mistake after acid adding Filter isolated ferrous precipitation and filtrate, in sour adition process maintenance system pH value be 1.5, sour additional amount be spent acid in iron from 1.1 times of son, acid are the mixed acid of citric acid, oxalic acid, acetic acid and EDTA, wherein the substance of citric acid, oxalic acid, acetic acid and EDTA Amount ratio be 5:2:1:1;

S2. above-mentioned separating filtrate is cooled down into precipitated crystal, secondary filter, filter cake dries in the shade to obtain sodium sulfate crystal Na2SO4.10H2O With secondary filtrate;

S3. it is concentrated by evaporation above-mentioned secondary filtrate to obtain chromium sulfate CrSO4, it is poly- that the condensed water of evaporation and concentration can be back to production It closes in aluminium chloride technique or is used for water in recycling.

Embodiment 2

A kind of comprehensive treatment utilization method of the spent acid containing chromium, includes the following steps:

S1. it will contain chromium spent acid pH value and be adjusted to 1, precipitation reaction occurs for acid adding and iron ion, is stirred for 20min after acid adding, filters Isolated ferrous precipitation and filtrate, maintenance system pH value is 1 in sour adition process, and sour additional amount is iron ion in spent acid 1.1 times, sour addition speed control is system pH >=0.5 after being added, and acid is the mixing of citric acid, oxalic acid, acetic acid and EDTA Acid, wherein the mass ratio of the material of citric acid, oxalic acid, acetic acid and EDTA are 4.5:2:1:1;

S2. above-mentioned separating filtrate is cooled down into precipitated crystal, secondary filter, filter cake dries in the shade to obtain sodium sulfate crystal Na2SO4.10H2O With secondary filtrate;

S3. it is concentrated by evaporation above-mentioned secondary filtrate to obtain chromium sulfate CrSO4, it is poly- that the condensed water of evaporation and concentration can be back to production Close in aluminium chloride technique or be used for recirculated water.

Embodiment 3

A kind of comprehensive treatment utilization method of the spent acid containing chromium, includes the following steps:

S1. it will contain chromium spent acid pH value and be adjusted to 3, precipitation reaction occurs for acid adding and iron ion, is stirred for 20min after acid adding, filters Isolated ferrous precipitation and filtrate, maintenance system pH value is 3 in sour adition process, and sour additional amount is iron ion in spent acid 1.1 times, sour addition speed control is system pH >=0.5 after being added, and acid is the mixing of citric acid, oxalic acid, acetic acid and EDTA Acid, wherein the mass ratio of the material of citric acid, oxalic acid, acetic acid and EDTA are 5:2.5:1:1;

S2. above-mentioned separating filtrate is cooled down into precipitated crystal, secondary filter, filter cake dries in the shade to obtain sodium sulfate crystal Na2SO4.10H2O With secondary filtrate;

S3. it is concentrated by evaporation above-mentioned secondary filtrate to obtain chromium sulfate CrSO4, it is poly- that the condensed water of evaporation and concentration can be back to production Close in aluminium chloride technique or be used for recirculated water.

Embodiment 4

A kind of comprehensive treatment utilization method of the spent acid containing chromium, includes the following steps:

S1. it uses concentration that will contain chromium spent acid pH value for 15% lye and is adjusted to 2, precipitation reaction occurs for acid adding and iron ion, adds It is stirred for 20min after acid, is separated by filtration to obtain ferrous precipitation and filtrate, maintenance system pH value is 2 in sour adition process, and sour adds Enter 1.1 times that amount is iron ion in spent acid, sour addition speed control is system pH >=0.5 after being added, and acid is citric acid, grass The mixed acid of acid, acetic acid and EDTA, wherein the mass ratio of the material of citric acid, oxalic acid, acetic acid and EDTA are 5:2:1:1;

S2. above-mentioned separating filtrate is cooled down into precipitated crystal, secondary filter, filter cake dries in the shade to obtain sodium sulfate crystal Na2SO4.10H2O With secondary filtrate;

S3. it is concentrated by evaporation above-mentioned secondary filtrate to obtain chromium sulfate CrSO4, it is poly- that the condensed water of evaporation and concentration can be back to production Close in aluminium chloride technique or be used for recirculated water.

Embodiment 5

A kind of comprehensive treatment utilization method of the spent acid containing chromium, includes the following steps:

S1. it will contain chromium spent acid pH value and be adjusted to 1, precipitation reaction occurs for acid adding and iron ion, is stirred for 20min after acid adding, filters Isolated ferrous precipitation and filtrate, maintenance system pH value is 1 in sour adition process, and sour additional amount is iron ion in spent acid 1.3 times, acid is the mixed acid of citric acid, oxalic acid, acetic acid and EDTA, wherein the amount of the substance of citric acid, oxalic acid, acetic acid and EDTA Than for 4.5:2:1:1;

S2. above-mentioned separating filtrate is cooled down into precipitated crystal, secondary filter, filter cake dries in the shade to obtain sodium sulfate crystal Na2SO4.10H2O With secondary filtrate;

S3. it is concentrated by evaporation above-mentioned secondary filtrate to obtain chromium sulfate CrSO4, it is poly- that the condensed water of evaporation and concentration can be back to production Close in aluminium chloride technique or be used for recirculated water.

Embodiment 6

A kind of comprehensive treatment utilization method of the spent acid containing chromium, includes the following steps:

S1. it will contain chromium spent acid pH value and be adjusted to 1, precipitation reaction occurs for acid adding and iron ion, is stirred for 20min after acid adding, filters Isolated ferrous precipitation and filtrate, maintenance system pH value is 1 in sour adition process, and sour additional amount is iron ion in spent acid 1.05 times, sour addition speed control is system pH >=0.5 after being added, and acid is the mixing of citric acid, oxalic acid, acetic acid and EDTA Acid, wherein the mass ratio of the material of citric acid, oxalic acid, acetic acid and EDTA are 4.5:2:1:1;

S2. above-mentioned separating filtrate is cooled down into precipitated crystal, secondary filter, filter cake dries in the shade to obtain sodium sulfate crystal Na2SO4.10H2O With secondary filtrate;

S3. it is concentrated by evaporation above-mentioned secondary filtrate to obtain chromium sulfate CrSO4, it is poly- that the condensed water of evaporation and concentration can be back to production Close in aluminium chloride technique or be used for recirculated water.

Embodiment 7

A kind of comprehensive treatment utilization method of the spent acid containing chromium, includes the following steps:

S1. it will contain chromium spent acid pH value and be adjusted to 1, precipitation reaction occurs for acid adding and iron ion, is stirred for 20min after acid adding, filters Isolated ferrous precipitation and filtrate, maintenance system pH value is 1 in sour adition process, and sour additional amount is iron ion in spent acid 1.2 again;

S2. above-mentioned separating filtrate is cooled down into precipitated crystal, secondary filter, filter cake dries in the shade to obtain sodium sulfate crystal Na2SO4.10H2O With secondary filtrate;

S3. it is concentrated by evaporation above-mentioned secondary filtrate to obtain chromium sulfate CrSO4, it is poly- that the condensed water of evaporation and concentration can be back to production Close in aluminium chloride technique or be used for recirculated water.

Embodiment 8

A kind of comprehensive treatment utilization method of the spent acid containing chromium, includes the following steps:

S1. it will contain chromium spent acid pH value with 10% lye and be adjusted to 1, precipitation reaction occurs for acid adding and iron ion, stirs again after acid adding 20min is mixed, is separated by filtration to obtain ferrous precipitation and filtrate, maintenance system pH value is 1 in sour adition process, and sour additional amount is useless 1.2 times of iron ion in acid;

S2. above-mentioned separating filtrate is cooled down into precipitated crystal, secondary filter, filter cake dries in the shade to obtain sodium sulfate crystal Na2SO4.10H2O With secondary filtrate;

S3. it is concentrated by evaporation above-mentioned secondary filtrate to obtain chromium sulfate CrSO4, it is poly- that the condensed water of evaporation and concentration can be back to production Close in aluminium chloride technique or be used for recirculated water.

Embodiment 9

A kind of comprehensive treatment utilization method of the spent acid containing chromium, includes the following steps:

S1. it will contain chromium spent acid pH value with 20% lye and be adjusted to 1, precipitation reaction occurs for acid adding and iron ion, stirs again after acid adding 20min is mixed, is separated by filtration to obtain ferrous precipitation and filtrate, maintenance system pH value is 1 in sour adition process, and sour additional amount is useless 1.2 times of iron ion in acid;

S2. above-mentioned separating filtrate is cooled down into precipitated crystal, secondary filter, filter cake dries in the shade to obtain sodium sulfate crystal Na2SO4.10H2O With secondary filtrate;

S3. above-mentioned secondary filtrate is concentrated by evaporation to obtain chromium sulfate CrSO4, it is poly- that the condensed water of evaporation and concentration can be back to production Close in aluminium chloride technique or be used for recirculated water.

Comparative example 1

A kind of processing of the spent acid containing chromium utilizes method, and lime is added to neutralize, by filters pressing after iron and chromium precipitating, at dangerous waste filter cake burning Reason.

As a result it detects

The rate of recovery and product quality of the acid of embodiment and comparative example, iron and chromium are detected, wherein

The detection method of the rate of recovery of acid are as follows: acidometry in GB/T 10531-2016

The detection method of the rate of recovery of iron are as follows: ferrous measuring method in GB/T 44822018

The detection method of the rate of recovery of chromium: the measurement atomic absorption spectrophotometry HJ749-2015 of total chromium

Testing result is as shown in table 2.

Obviously, the above embodiment of the present invention be only to clearly illustrate example of the present invention, and not be pair The restriction of embodiments of the present invention.For those of ordinary skill in the art, may be used also on the basis of the above description To make other variations or changes in different ways.There is no necessity and possibility to exhaust all the enbodiments.It is all this Made any modifications, equivalent replacements, and improvements etc., should be included in the claims in the present invention within the spirit and principle of invention Protection scope within.

Claims (10)

1. a kind of comprehensive treatment utilization method of spent acid containing chromium, sulfate radical and iron ion are contained in the spent acid, which is characterized in that Include the following steps:
S1. it will contain chromium spent acid pH value and be adjusted to 1 ~ 3, precipitation reaction, isolated ferrous precipitation and filter occur for acid adding and iron ion Liquid, maintenance system pH value is 1 ~ 3 during acid adding;
S2. by the cooling precipitated crystal of above-mentioned separating filtrate, sodium sulfate crystal and secondary filtrate is obtained by filtration;
S3. it is concentrated by evaporation above-mentioned secondary filtrate to obtain chromium sulfate.
2. comprehensive treatment utilization method as described in claim 1, which is characterized in that pH value described in S1 is adjusted to 1 ~ 2, system pH Value maintains 1 ~ 3.
3. comprehensive treatment utilization method as claimed in claim 1 or 2, which is characterized in that the addition speed of the precipitating of acid adding described in S1 Degree control is system pH >=0.5 after addition.
4. comprehensive treatment utilization method as claimed in claim 3, which is characterized in that sour additional amount described in S1 is iron ion 1.05 ~ 1.2 times of the amount of substance.
5. comprehensive treatment utilization method as described in claim 1, which is characterized in that acid described in S1 is citric acid, oxalic acid, acetic acid With the mixed acid of EDTA, wherein the mass ratio of the material of citric acid, oxalic acid, acetic acid and EDTA are 4.5 ~ 5.5:1.5 ~ 2.5:1:1.
6. comprehensive treatment utilization method as described in claim 1, which is characterized in that the pH value of spent acid containing chromium described in S1, which is adjusted, to be used The lye that concentration is 10 ~ 20%.
7. comprehensive treatment utilization method as described in claim 1, which is characterized in that system pH is by being added dropwise lye dimension in S1 It holds, wherein the concentration of lye is 5 ~ 20%.
8. comprehensive treatment utilization method as described in claim 1, which is characterized in that precipitation reaction time described in S1 be 20min ~ 40min。
9. comprehensive treatment utilization method as described in claim 1, which is characterized in that during the condensed water being concentrated by evaporation in S3 can be used as Water reuse.
10. comprehensive treatment utilization method as described in claim 1, which is characterized in that in the spent acid containing chromium chromium content be 0.5 ~ 1.0%。
CN201811497720.8A 2018-12-07 2018-12-07 A kind of comprehensive treatment utilization method of the spent acid containing chromium CN109626429A (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008027446A2 (en) * 2006-08-30 2008-03-06 Veolia Es Technical Solutions, L.L.C. Process for recycling waster acid
CN102786091A (en) * 2011-05-19 2012-11-21 长沙理工大学 Application treatment method of chromium-containing waste acid sludge in stainless steel factory
CN102887575A (en) * 2011-07-20 2013-01-23 宝山钢铁股份有限公司 Technology for recycling recovery of waste sulfuric acid
CN104805291A (en) * 2015-04-16 2015-07-29 南阳师范学院 Method for treating stainless steel pickling waste liquor and recovering iron, chromium and nickel
CN105800838A (en) * 2016-05-30 2016-07-27 张石海 Method for treating stainless steel pickling waste liquid
CN106145038A (en) * 2016-08-25 2016-11-23 天津市润杰创新环保科技股份公司 Spent acid is utilized to prepare method and the equipment thereof of regenerated acid
CN106636651A (en) * 2016-12-16 2017-05-10 江苏理工学院 Method for separating chromium from iron and aluminum in sulfuric acid system solution containing chromium, iron and aluminum

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008027446A2 (en) * 2006-08-30 2008-03-06 Veolia Es Technical Solutions, L.L.C. Process for recycling waster acid
CN102786091A (en) * 2011-05-19 2012-11-21 长沙理工大学 Application treatment method of chromium-containing waste acid sludge in stainless steel factory
CN102887575A (en) * 2011-07-20 2013-01-23 宝山钢铁股份有限公司 Technology for recycling recovery of waste sulfuric acid
CN104805291A (en) * 2015-04-16 2015-07-29 南阳师范学院 Method for treating stainless steel pickling waste liquor and recovering iron, chromium and nickel
CN105800838A (en) * 2016-05-30 2016-07-27 张石海 Method for treating stainless steel pickling waste liquid
CN106145038A (en) * 2016-08-25 2016-11-23 天津市润杰创新环保科技股份公司 Spent acid is utilized to prepare method and the equipment thereof of regenerated acid
CN106636651A (en) * 2016-12-16 2017-05-10 江苏理工学院 Method for separating chromium from iron and aluminum in sulfuric acid system solution containing chromium, iron and aluminum

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