CN102249328A - Method for preparing chromium hydroxide and aluminum chloride from chromium-containing aluminum sludge - Google Patents
Method for preparing chromium hydroxide and aluminum chloride from chromium-containing aluminum sludge Download PDFInfo
- Publication number
- CN102249328A CN102249328A CN2010105982022A CN201010598202A CN102249328A CN 102249328 A CN102249328 A CN 102249328A CN 2010105982022 A CN2010105982022 A CN 2010105982022A CN 201010598202 A CN201010598202 A CN 201010598202A CN 102249328 A CN102249328 A CN 102249328A
- Authority
- CN
- China
- Prior art keywords
- chromium
- aluminum chloride
- chloride
- aluminum
- chromium hydroxide
- 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.)
- Pending
Links
Images
Landscapes
- Treatment Of Sludge (AREA)
Abstract
The invention provides a method for preparing chromium hydroxide and aluminum chloride from chromium-containing aluminum sludge, and the method comprises: adding the chromium-containing aluminum sludge and hydrochloric acid to a corrosion-resistant reactor for a mixing reaction to obtain a mixture of chromium chloride and aluminum chloride, and carrying out suction-filtering to obtain a mixed solution and a silica-containing filter cake; adding an excessive amount of industrial water to the mixed solution, thus hydrolyzing chromium chloride to generate and precipitate trivalent chromium hydroxide, and then carrying out suction-filtering to obtain a clear filtrate containing aluminum chloride and a chromium hydroxide filter cake; washing the chromium hydroxide filter cake, drying and crushing to obtain a chromium hydroxide product; and conveying the clear filtrate containing aluminum chloride into a decompressing distiller, decompressing and heating to the evaporation point of water for evaporating water so as to obtain an aluminum chloride saturated solution, then discharging the aluminum chloride saturated solution into a cooling crystallizer for cooling crystallization to precipitate aluminum chloride crystals, and then rectifying to obtain an aluminum chloride product.
Description
Technical field
The present invention relates to the improvement of inorganic chemical industry three wastes chromium slag and utilize technical field, relate in particular to a kind of method for preparing chromium hydroxide and aluminum chloride with chromium-contained aluminum mud.
Background technology
The chromium slag is meant that in the sodium dichromate 99 production process chromite is through using the residue of water extraction sodium dichromate 99 after the roasting.Because raw materials used, production technique and prescription are different, the chromium slag is formed different, the composition that it is basic and the per-cent of composition are as follows: the chromium sesquioxide mass percent is 2.5-4%, water-soluble sexavalent chrome mass percent is 0.28-1.34%, and solubility in acid sexavalent chrome mass percent is 0.9-1.4﹠amp; , the calcium oxide mass percent is 29-36﹠amp; , magnesium oxide quality percentage ratio 20-33%, the aluminium sesquioxide mass percent is 5-8%, silicon-dioxide quality percentage ratio is 8-11%.Because the sexavalent chrome that contains in the chromium slag has strong oxidizing property, organism is caused intensive corrosion and destroys, and in a single day soil and underground water are subjected to chromic pollution, and soil can not farming, underground water can't be drunk, thereby is the carcinogenic substance and the hypertoxicity thing of MA.Therefore,, separate the toxicity of dechromisation slag if can not take special control measures that the chromium slag is handled, in case polluted environment, particularly underground water and soil, its consequence is very serious.
In addition, also contain a large amount of useful compositions in the chromium slag, be necessary it is purified and conversion process, to give full play to the economic worth of chromium slag.
Summary of the invention
The objective of the invention is to, a kind of method for preparing chromium hydroxide and aluminum chloride with chromium-contained aluminum mud is provided, this method is with the simple processing treatment of chromium-contained aluminum mud process, make original deleterious sexavalent chrome, become nontoxic trivalent chromium, make chromium hydroxide and aluminum chloride, the potential value of the chromium-contained aluminum mud that has made full use of, and do not produce secondary pollution, being one turns waste into wealth, economic and practical method.
Technical scheme of the present invention is as follows: a kind ofly prepare the method for chromium hydroxide and aluminum chloride with chromium-contained aluminum mud, comprise following concrete steps:
Steps A: the ratio by the molar content of the hydrogenchloride that contains in the molar content sum of aluminium that contains in the chromium-contained aluminum mud and chromium trioxide and the hydrochloric acid is 1: 5.6-8.4 drops into hybrid reaction in the corrosion-resistant reactor one (1) with chromium-contained aluminum mud and hydrochloric acid, obtain containing the mixture of chromium chloride, aluminum chloride, reactant obtains mixed solution and silica containing filter cake through suction filtration machine one (2) suction filtration;
Step B: steps A gained mixed solution is sent into slurry tank (3) lining, and add excessive service water, make the chromium chloride hydrolysis form the trivalent chromium chromium hydroxide and sedimentation, obtain containing the clear filtrate and the chromium hydroxide filter cake of aluminum chloride again through suction filtration machine two (4) suction filtrations;
Step C: chromium hydroxide product (8) is pulverized, obtained to the chromium hydroxide filter cake through washing machine one (5), drying machine one (6) drying, pulverizer one (7);
Step D: the clear filtrate that contains aluminum chloride is sent in the underpressure distillation device (9), the decompression intensification reaches the evaporation of water point and evaporates the water, become the aluminum chloride saturated solution and then enter cooling crystallizer (10) lining crystallisation by cooling, separate out the aluminum chloride crystal, obtain aluminum chloride product (11) by rectifying again.
It should be noted that in the steps A can not add excessive service water in the corrosion-resistant reactor,, mix in the remaining residue in order to avoid cause the chromium chloride premature hydrolysis to form chromic chromium hydroxide.
The silica filter cake of steps A gained is used to make siliceous product.
The chlorine that steps A is produced absorbs separately.
Of the present inventionly prepare the method for chromium hydroxide and aluminum chloride with chromium-contained aluminum mud, its chemical principle is:
2CrO
3+12HCl＝＝＝＝＝2CrCl
3+3Cl
2+6H
2O
CrCl
3+3H
2O＝＝＝＝＝Cr(OH)
3+3HCl
2Al+6HCl＝＝＝＝＝2AlCl
3+3H
2
Beneficial effect of the present invention is: the method for preparing chromium hydroxide and aluminum chloride with chromium-contained aluminum mud of the present invention, through simple processing treatment, make chromium hydroxide and aluminum chloride, made full use of the potential value of chromium-contained aluminum mud, and do not produce secondary pollution, being one turns waste into wealth, economic and practical method.This method is simple to operate, and facility investment is few, is worthy of popularization.
Description of drawings
Fig. 1 prepares the process flow sheet of the method for chromium hydroxide and aluminum chloride for of the present invention with chromium-contained aluminum mud, wherein, and (1) corrosion-resistant reactor one, (2) the suction filtration machine one, (3) in the slurry tank, (4) suction filtration machine two, (5) washing machine one, (6) drying machine one, (7) pulverizer one, (8) chromium hydroxide product, (9) underpressure distillation device, (10) cooling crystallizer, (11) aluminum chloride product.
Embodiment
Embodiment 1:
With reference to Fig. 1, a kind ofly prepare the method for chromium hydroxide and aluminum chloride with chromium-contained aluminum mud, comprise following concrete steps:
Steps A: take by weighing the chromium-contained aluminum mud that contains 200kg chromium trioxide and 270kg aluminium, by the ratio of the molar content of the hydrogenchloride that contains in the molar content sum of aluminium that contains in the chromium-contained aluminum mud and chromium trioxide and the hydrochloric acid is chromium-contained aluminum mud and hydrochloric acid to be dropped into hybrid reaction in the corrosion-resistant reactor one (1) in 1: 5.6, obtain containing the mixture of chromium chloride, aluminum chloride, reactant obtains mixed solution and silica containing filter cake through suction filtration machine one (2) suction filtration;
Step B: steps A gained mixed solution is sent into slurry tank (3) lining, and add excessive service water, make the chromium chloride hydrolysis form the trivalent chromium chromium hydroxide and sedimentation, obtain containing the clear filtrate and the chromium hydroxide filter cake of aluminum chloride again through suction filtration machine two (4) suction filtrations;
Step C: chromium hydroxide product (8) is pulverized, obtained to the chromium hydroxide filter cake through washing machine one (5), drying machine one (6) drying, pulverizer one (7), and the quality of the chromium hydroxide pure substance that it contains is 193.6kg;
Step D: the clear filtrate that contains aluminum chloride is sent in the underpressure distillation device (9), the decompression intensification reaches the evaporation of water point and evaporates the water, become the aluminum chloride saturated solution and then enter cooling crystallizer (10) lining crystallisation by cooling, separate out the aluminum chloride crystal, obtain aluminum chloride product (11) by rectifying again, the quality of the aluminum chloride pure substance that it contains is 1064kg.
Embodiment 2:
With reference to Fig. 1, a kind ofly prepare the method for chromium hydroxide and aluminum chloride with chromium-contained aluminum mud, comprise following concrete steps:
Steps A: take by weighing the chromium-contained aluminum mud that contains 200kg chromium trioxide and 270kg aluminium, by the ratio of the molar content of the hydrogenchloride that contains in the molar content sum of aluminium that contains in the chromium-contained aluminum mud and chromium trioxide and the hydrochloric acid is chromium-contained aluminum mud and hydrochloric acid to be dropped into hybrid reaction in the corrosion-resistant reactor one (1) in 1: 7, obtain containing the mixture of chromium chloride, aluminum chloride, reactant obtains mixed solution and silica containing filter cake through suction filtration machine one (2) suction filtration;
Step B: steps A gained mixed solution is sent into slurry tank (3) lining, and add excessive service water, make the chromium chloride hydrolysis form the trivalent chromium chromium hydroxide and sedimentation, obtain containing the clear filtrate and the chromium hydroxide filter cake of aluminum chloride again through suction filtration machine two (4) suction filtrations;
Step C: chromium hydroxide product (8) is pulverized, obtained to the chromium hydroxide filter cake through washing machine one (5), drying machine one (6) drying, pulverizer one (7), and the amount of the chromium hydroxide pure substance that it contains is 242kg;
Step D: the clear filtrate that contains aluminum chloride is sent in the underpressure distillation device (9), the decompression intensification reaches the evaporation of water point and evaporates the water, become the aluminum chloride saturated solution and then enter cooling crystallizer (10) lining crystallisation by cooling, separate out the aluminum chloride crystal, obtain aluminum chloride product (11) by rectifying again, the quality of the aluminum chloride pure substance that it contains is 1330kg.
Embodiment 3:
With reference to Fig. 1, a kind ofly prepare the method for chromium hydroxide and aluminum chloride with chromium-contained aluminum mud, comprise following concrete steps:
Steps A: take by weighing the chromium-contained aluminum mud that contains 200kg chromium trioxide and 270kg aluminium, by the ratio of the molar content of the hydrogenchloride that contains in the molar content sum of aluminium that contains in the chromium-contained aluminum mud and chromium trioxide and the hydrochloric acid is chromium-contained aluminum mud and hydrochloric acid to be dropped into hybrid reaction in the corrosion-resistant reactor one (1) in 1: 8.4, obtain containing the mixture of chromium chloride, aluminum chloride, reactant obtains mixed solution and silica containing filter cake through suction filtration machine one (2) suction filtration;
Step B: steps A gained mixed solution is sent into slurry tank (3) lining, and add excessive service water, make the chromium chloride hydrolysis form the trivalent chromium chromium hydroxide and sedimentation, obtain containing the clear filtrate and the chromium hydroxide filter cake of aluminum chloride again through suction filtration machine two (4) suction filtrations;
Step C: chromium hydroxide product (8) is pulverized, obtained to the chromium hydroxide filter cake through washing machine one (5), drying machine one (6) drying, pulverizer one (7), and the amount of the chromium hydroxide pure substance that it contains is 242kg;
Step D: the clear filtrate that contains aluminum chloride is sent in the underpressure distillation device (9), the decompression intensification reaches the evaporation of water point and evaporates the water, become the aluminum chloride saturated solution and then enter cooling crystallizer (10) lining crystallisation by cooling, separate out the aluminum chloride crystal, obtain aluminum chloride product (11) by rectifying again, the quality of the aluminum chloride pure substance that it contains is 1330kg.
Above content be in conjunction with concrete preferred implementation to further describing that the present invention did, can not assert that concrete enforcement of the present invention is confined to these explanations.For the general technical staff of the technical field of the invention, without departing from the inventive concept of the premise, its framework form can be flexible and changeable, can the subseries product.Just make some simple deduction or replace, all should be considered as belonging to the scope of patent protection that the present invention is determined by claims of being submitted to.
Claims (2)
1. one kind prepares the method for chromium hydroxide and aluminum chloride with chromium-contained aluminum mud, it is characterized in that, comprises following concrete steps:
Steps A: the ratio by the molar content of the hydrogenchloride that contains in the molar content sum of aluminium that contains in the chromium-contained aluminum mud and chromium trioxide and the hydrochloric acid is 1: 5.6-8.4 drops into hybrid reaction in the corrosion-resistant reactor one (1) with chromium-contained aluminum mud and hydrochloric acid, obtain containing the mixture of chromium chloride, aluminum chloride, reactant obtains mixed solution and silica containing filter cake through suction filtration machine one (2) suction filtration;
Step B: steps A gained mixed solution is sent into slurry tank (3) lining, and add excessive service water, make the chromium chloride hydrolysis form the trivalent chromium chromium hydroxide and sedimentation, obtain containing the clear filtrate and the chromium hydroxide filter cake of aluminum chloride again through suction filtration machine two (4) suction filtrations;
Step C: chromium hydroxide product (8) is pulverized, obtained to the chromium hydroxide filter cake through washing machine one (5), drying machine one (6) drying, pulverizer one (7);
Step D: the clear filtrate that contains aluminum chloride is sent in the underpressure distillation device (9), the decompression intensification reaches the evaporation of water point and evaporates the water, become the aluminum chloride saturated solution and then enter cooling crystallizer (10) lining crystallisation by cooling, separate out the aluminum chloride crystal, obtain aluminum chloride product (11) by rectifying again.
2. as claimed in claim 1ly prepare the method for chromium hydroxide and aluminum chloride, it is characterized in that the silica filter cake of steps A gained is used to make siliceous product with chromium-contained aluminum mud.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010105982022A CN102249328A (en) | 2010-12-21 | 2010-12-21 | Method for preparing chromium hydroxide and aluminum chloride from chromium-containing aluminum sludge |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010105982022A CN102249328A (en) | 2010-12-21 | 2010-12-21 | Method for preparing chromium hydroxide and aluminum chloride from chromium-containing aluminum sludge |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102249328A true CN102249328A (en) | 2011-11-23 |
Family
ID=44976964
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010105982022A Pending CN102249328A (en) | 2010-12-21 | 2010-12-21 | Method for preparing chromium hydroxide and aluminum chloride from chromium-containing aluminum sludge |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102249328A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103803768A (en) * | 2014-01-09 | 2014-05-21 | 江苏大明科技有限公司 | Aluminum sludge resource and safe disposal production system |
-
2010
- 2010-12-21 CN CN2010105982022A patent/CN102249328A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103803768A (en) * | 2014-01-09 | 2014-05-21 | 江苏大明科技有限公司 | Aluminum sludge resource and safe disposal production system |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102115120A (en) | Method for producing calcium carbonate by using carbide slag | |
| CN102115828B (en) | Method for preparing iron and aluminum and coproducing sodium sulfate from red mud produced by bayer process | |
| CN102249328A (en) | Method for preparing chromium hydroxide and aluminum chloride from chromium-containing aluminum sludge | |
| CN102249311A (en) | Method for preparing chromic hydroxide, aluminum nitrate and sodium chloride from mud containing chromium and aluminum | |
| CN102249329A (en) | Method for preparing chromic hydroxide, sodium chloride and nitric acid utilizing sodium sulfate containing chromium | |
| CN102249310A (en) | Method for preparing chromium hydroxide, aluminum phosphate and sodium chloride by using mud containing chromium and aluminum | |
| CN102249312A (en) | Method for preparing chromium hydroxide, potassium chloride and mixed phosphate from chromium slags | |
| CN102249313A (en) | Method for preparing chromium hydroxide, lead chloride and mixed nitrate from chromium slag | |
| CN102259926A (en) | Method for preparing chromium hydroxide, ammonium chloride, calcium and magnesium carbonates and aluminum hydroxide | |
| CN102249314A (en) | Method for preparing chromic hydroxide, lead chloride and sodium nitrate by chromium-containing mirabilite | |
| CN102249327A (en) | Method for using chrome-containing aluminum sludge to prepare chromium hydroxide, aluminum sulfate and sodium chloride | |
| CN102249317A (en) | Method for preparing chromium hydroxide, silver chloride and nitrates of calcium, magnesium and aluminum from chromium slag | |
| CN102249315A (en) | Method for preparing chromium hydroxide, sodium chloride and potassium nitrate from chromium-containing mirabilite | |
| CN102249316A (en) | Method for preparing chromium hydroxide and co-producing iron chloride and calcium, magnesium and aluminum mixed hydroxide by using chromium residues | |
| CN102259913A (en) | Method for preparing chromium hydroxide, potassium chloride and calcium magnesium aluminum hydroxides from chromium slag | |
| CN102249308A (en) | Method for preparing chromium hydroxide, potassium chloride and mixed nitrate from chromium slags | |
| CN105502454A (en) | Method for preparing high-purity aluminum sulfate from industrial sludge and scrap in aluminum material factory through resource utilization | |
| CN102259925A (en) | Method for preparing chromium hydroxide, cobalt chloride and calcium, magnesium and aluminum hydroxide by using chromium slag | |
| CN102115087A (en) | Method for producing silicon dioxide and calcium silicate by phosphorus residue | |
| CN102167372A (en) | Method for preparing aluminum hydroxide and iron hydroxide coproduced with potassium hydroxide and sodium sulfate by using vanadium slurry | |
| CN102115823B (en) | Method for preparing iron and aluminum and co-producing sodium sulfate from bayer process red mud | |
| CN102167377A (en) | Method for preparing aluminum chloride coproduced with potassium chloride and iron chloride by using vanadium slurry | |
| CN102249339A (en) | Method for preparing manganese sulfate, tetrahydrate manganese chloride and calcium sulfate | |
| CN102115051A (en) | Method for producing calcium phosphate by utilizing carbide slag | |
| CN102115173A (en) | Method for preparing chromium hydroxide, calcium sulfate and magnesium carbonate by using detoxified chromium residues |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20111123 |