CN102249329A - Method for preparing chromic hydroxide, sodium chloride and nitric acid utilizing sodium sulfate containing chromium - Google Patents
Method for preparing chromic hydroxide, sodium chloride and nitric acid utilizing sodium sulfate containing chromium Download PDFInfo
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- CN102249329A CN102249329A CN2010105982164A CN201010598216A CN102249329A CN 102249329 A CN102249329 A CN 102249329A CN 2010105982164 A CN2010105982164 A CN 2010105982164A CN 201010598216 A CN201010598216 A CN 201010598216A CN 102249329 A CN102249329 A CN 102249329A
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- chromium
- nitric acid
- sodium chloride
- sodium
- filter cake
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/82—Recycling of waste of electrical or electronic equipment [WEEE]
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Abstract
The invention a method for preparing chromic hydroxide, sodium chloride and nitric acid utilizing sodium sulfate containing chromium. Sodium sulfate containing chromium is reacted with hydrochloric acid to obtain a mixture of chromium chloride, sodium chloride and nitric acid, and the mixture is treated with extraction filtration to obtain a mixed liquor and a filter cake containing silica. The obtained mixed liquor is sent to a precipitation pot and added with an excess amount of industrial water, so that chromium chloride is hydrolyzed into trivalent chromium chromic hydroxide; then extraction filtration is carried out to obtain a clarified mixture containing sodium chloride and nitric acid, and a chromic hydroxide filter cake. The chromic hydroxide filter cake is washed, dried and crushed to obtain a chromic hydroxide product (8). The clarified mixture containing sodium chloride and nitric acid is treated with reduced pressure distillation to obtain a sodium chloride saturated solution and is cooled for crystallization; sodium chloride crystals are precipitated to obtain a sodium chloride product; and a residual liquid nitric acid solution is treated with rectification to obtain a nitric acid solution 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 usefulness and contain the method that the chromium saltcake prepares chromium hydroxide, sodium-chlor and nitric acid.
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%, solubility in acid sexavalent chrome mass percent is 0.9-1.4%, and the calcium oxide mass percent is 29-36%, magnesium oxide quality percentage ratio 20-33%, the aluminium sesquioxide mass percent is 5-8%, and 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, provide a kind of usefulness to contain the method that the chromium saltcake prepares chromium hydroxide, sodium-chlor and nitric acid, this method will contain the chromium saltcake through simple processing treatment, make original deleterious sexavalent chrome, become nontoxic trivalent chromium, make chromium hydroxide and sodium-chlor and nitric acid, the potential value that contains the chromium saltcake 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 of usefulness contains the method that the chromium saltcake prepares chromium hydroxide, sodium-chlor and nitric acid, comprises following concrete steps:
Steps A: the ratio by the molar content of the material of the hydrogenchloride that contains in the molar content sum that contains the chromium trioxide that contains in the chromium saltcake and SODIUMNITRATE and the hydrochloric acid is 1: 0.8-1.2 will contain the chromium saltcake and hydrochloric acid drops into hybrid reaction in the corrosion-resistant reactor one (1), obtain containing the mixture of chromium chloride, sodium-chlor and nitric acid, 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 obtains clarifying sodium chloride-containing and nitrate mixture and chromium hydroxide filter cake through suction filtration machine two (4) suction filtrations again;
Step C: chromium hydroxide product (8) is pulverized, obtained to the chromium hydroxide filter cake through washing machine (5), drying machine (6) drying, pulverizer (7);
Step D: clarification sodium chloride-containing and nitrate mixture are sent in the underpressure distillation device (9), the decompression intensification reaches the evaporation of water point and evaporates the water, become sodium chloride saturated solution and then enter cooling crystallizer (10) lining crystallisation by cooling, sodium chloride crystal is separated out and is obtained sodium-chlor product (11), remaining liq is exactly a salpeter solution, just obtains salpeter solution product (12) 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.
Usefulness of the present invention contains the method that the chromium saltcake prepares chromium hydroxide, sodium-chlor and nitric acid, and its chemical principle is:
2CrO
3+12HCl＝＝＝＝＝2CrCl
3+3Cl
2+6H
2O
CrCl
3+3H
2O＝＝＝＝＝Cr(OH)
3+3HCl
NaNO
3+HCl＝＝＝＝＝NaCl+HNO
3
Beneficial effect of the present invention is: usefulness of the present invention contains the method that the chromium saltcake prepares chromium hydroxide, sodium-chlor and nitric acid, through simple processing treatment, make chromium hydroxide and sodium-chlor and nitric acid, made full use of the potential value that contains the chromium saltcake, 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 contains the process flow sheet that the chromium saltcake prepares the method for chromium hydroxide, sodium-chlor and nitric acid for usefulness of the present invention, wherein, and (1) corrosion-resistant reactor one, (2) the suction filtration machine one, in (3) slurry tank, and (4) suction filtration machine two, (5) washing machine, (6) drying machine, (7) pulverizer, (8) chromium hydroxide product, (9) underpressure distillation device, (10) cooling crystallizer, (11) sodium-chlor product, (12) salpeter solution product.
Embodiment
Embodiment 1:
With reference to Fig. 1, a kind of usefulness contains the method that the chromium saltcake prepares chromium hydroxide, sodium-chlor and nitric acid, comprises following concrete steps:
Steps A: take by weighing contain 200 chromium trioxides and 380kg SODIUMNITRATE contain the chromium saltcake, by the ratio of the molar content of the material of the hydrogenchloride that contains in the molar content sum that contains the chromium trioxide that contains in the chromium saltcake and SODIUMNITRATE and the hydrochloric acid is will contain chromium saltcake at 1: 0.8 and hydrochloric acid drops into hybrid reaction in the corrosion-resistant reactor one (1), obtain containing the mixture of chromium chloride, sodium-chlor and nitric acid, 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 obtains clarifying sodium chloride-containing and nitrate mixture and chromium hydroxide filter cake through suction filtration machine two (4) suction filtrations again;
Step C: chromium hydroxide product (8) is pulverized, obtained to the chromium hydroxide filter cake through washing machine (5), drying machine (6) drying, pulverizer (7), and the quality of the chromium hydroxide pure substance that it contains is 193.6kg;
Step D: clarification sodium chloride-containing and nitrate mixture are sent in the underpressure distillation device (9), the decompression intensification reaches the evaporation of water point and evaporates the water, become sodium chloride saturated solution and then enter cooling crystallizer (10) lining crystallisation by cooling, sodium chloride crystal is separated out and is obtained sodium-chlor product (11), the quality of the sodium-chlor pure substance that it contains is 187.2kg, remaining liq is exactly a salpeter solution, just obtains salpeter solution product (12) by rectifying again, and the quality of the nitric acid pure substance that it contains is 201.6kg.
Embodiment 2:
With reference to Fig. 1, a kind of usefulness contains the method that the chromium saltcake prepares chromium hydroxide, sodium-chlor and nitric acid, comprises following concrete steps:
Steps A: take by weighing contain 200 chromium trioxides and 380kg SODIUMNITRATE contain the chromium saltcake, by the ratio of the molar content of the material of the hydrogenchloride that contains in the molar content sum that contains the chromium trioxide that contains in the chromium saltcake and SODIUMNITRATE and the hydrochloric acid is will contain chromium saltcake at 1: 1 and hydrochloric acid drops into hybrid reaction in the corrosion-resistant reactor one (1), obtain containing the mixture of chromium chloride, sodium-chlor and nitric acid, 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 obtains clarifying sodium chloride-containing and nitrate mixture and chromium hydroxide filter cake through suction filtration machine two (4) suction filtrations again;
Step C: chromium hydroxide product (8) is pulverized, obtained to the chromium hydroxide filter cake through washing machine (5), drying machine (6) drying, pulverizer (7), and the amount of the chromium hydroxide pure substance that it contains is 242kg;
Step D: clarification sodium chloride-containing and nitrate mixture are sent in the underpressure distillation device (9), the decompression intensification reaches the evaporation of water point and evaporates the water, become sodium chloride saturated solution and then enter cooling crystallizer (10) lining crystallisation by cooling, sodium chloride crystal is separated out and is obtained sodium-chlor product (11), the quality of the sodium-chlor pure substance that it contains is 234kg, remaining liq is exactly a salpeter solution, just obtains salpeter solution product (12) by rectifying again, and the quality of the nitric acid pure substance that it contains is 252kg.
Embodiment 3:
With reference to Fig. 1, a kind of usefulness contains the method that the chromium saltcake prepares chromium hydroxide, sodium-chlor and nitric acid, comprises following concrete steps:
Steps A: take by weighing contain 200 chromium trioxides and 380kg SODIUMNITRATE contain the chromium saltcake, by the ratio of the molar content of the material of the hydrogenchloride that contains in the molar content sum that contains the chromium trioxide that contains in the chromium saltcake and SODIUMNITRATE and the hydrochloric acid is will contain chromium saltcake at 1: 1.2 and hydrochloric acid drops into hybrid reaction in the corrosion-resistant reactor one (1), obtain containing the mixture of chromium chloride, sodium-chlor and nitric acid, 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 obtains clarifying sodium chloride-containing and nitrate mixture and chromium hydroxide filter cake through suction filtration machine two (4) suction filtrations again;
Step C: chromium hydroxide product (8) is pulverized, obtained to the chromium hydroxide filter cake through washing machine (5), drying machine (6) drying, pulverizer (7), and the amount of the chromium hydroxide pure substance that it contains is 242kg;
Step D: clarification sodium chloride-containing and nitrate mixture are sent in the underpressure distillation device (9), the decompression intensification reaches the evaporation of water point and evaporates the water, become sodium chloride saturated solution and then enter cooling crystallizer (10) lining crystallisation by cooling, sodium chloride crystal is separated out and is obtained sodium-chlor product (11), the quality of the sodium-chlor pure substance that it contains is 234kg, remaining liq is exactly a salpeter solution, just obtains salpeter solution product (12) by rectifying again, and the quality of the nitric acid pure substance that it contains is 252kg.
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 with containing the method that the chromium saltcake prepares chromium hydroxide, sodium-chlor and nitric acid, it is characterized in that, comprises following concrete steps:
Steps A: the ratio by the molar content of the material of the hydrogenchloride that contains in the molar content sum that contains the chromium trioxide that contains in the chromium saltcake and SODIUMNITRATE and the hydrochloric acid is 1: 0.8-1.2 will contain the chromium saltcake and hydrochloric acid drops into hybrid reaction in the corrosion-resistant reactor one (1), obtain containing the mixture of chromium chloride, sodium-chlor and nitric acid, 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 obtains clarifying sodium chloride-containing and nitrate mixture and chromium hydroxide filter cake through suction filtration machine two (4) suction filtrations again;
Step C: chromium hydroxide product (8) is pulverized, obtained to the chromium hydroxide filter cake through washing machine (5), drying machine (6) drying, pulverizer (7);
Step D: clarification sodium chloride-containing and nitrate mixture are sent in the underpressure distillation device (9), the decompression intensification reaches the evaporation of water point and evaporates the water, become sodium chloride saturated solution and then enter cooling crystallizer (10) lining crystallisation by cooling, sodium chloride crystal is separated out and is obtained sodium-chlor product (11), remaining liq is exactly a salpeter solution, just obtains salpeter solution product (12) by rectifying again.
2. usefulness as claimed in claim 1 contains the method that the chromium saltcake prepares chromium hydroxide, sodium-chlor and nitric acid, it is characterized in that, the silica filter cake of steps A gained is used to make siliceous product.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010105982164A CN102249329A (en) | 2010-12-21 | 2010-12-21 | Method for preparing chromic hydroxide, sodium chloride and nitric acid utilizing sodium sulfate containing chromium |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010105982164A CN102249329A (en) | 2010-12-21 | 2010-12-21 | Method for preparing chromic hydroxide, sodium chloride and nitric acid utilizing sodium sulfate containing chromium |
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| CN102249329A true CN102249329A (en) | 2011-11-23 |
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|---|---|---|---|
| CN2010105982164A Pending CN102249329A (en) | 2010-12-21 | 2010-12-21 | Method for preparing chromic hydroxide, sodium chloride and nitric acid utilizing sodium sulfate containing chromium |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113620318A (en) * | 2021-07-31 | 2021-11-09 | 华南理工大学 | Method for treating chromium-containing mirabilite waste salt by chlorination process |
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2010
- 2010-12-21 CN CN2010105982164A patent/CN102249329A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113620318A (en) * | 2021-07-31 | 2021-11-09 | 华南理工大学 | Method for treating chromium-containing mirabilite waste salt by chlorination process |
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Application publication date: 20111123 |