CN101288795A - Chromic salt production and extracting and reducing method of hexavalent chromium from chromic slag left behind society - Google Patents
Chromic salt production and extracting and reducing method of hexavalent chromium from chromic slag left behind society Download PDFInfo
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- CN101288795A CN101288795A CNA2008101082304A CN200810108230A CN101288795A CN 101288795 A CN101288795 A CN 101288795A CN A2008101082304 A CNA2008101082304 A CN A2008101082304A CN 200810108230 A CN200810108230 A CN 200810108230A CN 101288795 A CN101288795 A CN 101288795A
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- chromium
- chromium slag
- slag
- chrome
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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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/10—Production of cement, e.g. improving or optimising the production methods; Cement grinding
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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
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
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Abstract
The invention discloses a method for extracting and reducing sexivalent chrome in chromium residue which is produced in chromate production and remained in the society. The method of the invention adopts a porous slot to load chromium residue (needing no grinding disposal); the sexivalent chrome liquor in the chrome residue is extracted under the conditions of pressurizing high-temperature saturation, high-pressure and vacuum by adding water in an autoclave; acid water is then added in the autoclave to dip and dissolve calcium chromate in the chrome residue, which is then converted into sexivalent chrome solution; the sexivalent chrome liquor is then extracted under the conditions of high pressure and vacuum; reduction reagent (ferrous sulfate) is added in the autoclave to reduce the sexivalent chrome residual in the chrome residue and converts the sexivalent chrome residue into trivalent chromium which is then fixed in the chrome residue; the gained sexivalent chrome can be used for preparing chrome products; the disposed non-toxic chrome residue can be used for auxiliary materials of cement and concrete, brick aggregate used for building and natural filling and disposal.
Description
Technical field
The present invention relates to that Cr VI extracts and method of reducing in the chromium slag of a kind of chromium salt production and social survival.
Background technology
Chromium salt production is to be raw material with chromite, lime stone and soda ash, through calcining trivalent chromium is oxidized to Cr VI, makes sodium dichromate (being called chromic salts) with the water extraction Cr VI again, and the residue of discharge is called the chromium slag.The chromium slag generally contains 1～2% sodium chromate and calcium chromate (Cr VI), meets water leaching Cr VI stripping wherein, pollutes water and soil, life threatening.Therefore, the chromium slag is classified as hazardous waste by national environmental protection department, and national Eleventh Five-Year Plan requires that the chromium slag of chromium salt production unit and social survival all will obtain harmless treatment before 2010.The purpose of handling the chromium slag is to be trivalent chromium with the hexavalent chrome reduction in the chromium slag, and is fixed in the chromium slag, obtains resource or natural landfill disposal simultaneously.
My former processing chromium slag technology is to adopt the method for wet grinding that the chromium slag is ground to form slurry, fully soak into, filter, extract the sexavalence chrome liquor in the chromium slag, the calcium chromate that adopts sour water to soak in the dissolve chromium slag again is converted into hexavalent chromium water solution, extract the sexavalence chrome liquor in the chromium slag again, system chromium product obtains favorable economic benefit, reduce content of 6-valence Cr ions in the chromium slag simultaneously, saved the reduction medicament.Chromium slag after extracting the sexavalence chrome liquor adds that remaining Cr VI is transformed into trivalent chromium in reduction medicament (ferrous sulfate) reduced chromium slag again, and is fixed in the chromium slag, and it is nontoxic to reach the chromium slag, but resource also can be done the nature landfill disposal.But in implementation process,, be difficult to filter and extract the sexavalence chrome liquor, cause and handle chromium slag cost height, can't realize handling chromium slag purpose because of chromium slag overgrinding.
Summary of the invention
The present invention adopts porous pit to load chromium slag (not must milled processed), through autoclave add water, pressurized high-temperature soaks into, high pressure vacuum extracts the sexavalence chrome liquor in the chromium slag; The calcium chromate that adds in still again in the sour water immersion dissolve chromium slag is converted into hexavalent chromium water solution, and high pressure vacuum extracts the sexavalence chrome liquor in the chromium slag again; Add in still again that remaining Cr VI is transformed into trivalent chromium in reduction medicament (ferrous sulfate) reduced chromium slag, and be fixed in the chromium slag; Gained sexavalence chrome liquor can be made the chromium product, and the nontoxic chromium slag after the processing can be made cement, concrete auxiliary material and building brick aggregate and natural landfill disposal.Detailed content is as follows:
(1) characteristics of the present invention are to be applicable to that the chromium slag is handled and social survival's chromium slag processing in the produced in several ways chromic salts process;
(2) the chromium slag must milled processed, directly adopts porous pit to load the chromium slag, fully soaks into Cr VI in the chromium slag through HTHP, make in the chromium slag Cr VI fully extracted, reduce the content of 6-valence Cr ions in the chromium slag, also reduced the reduction dosing simultaneously, reduced chromium slag processing cost;
(3) calcium chromate in the sour water immersion dissolve chromium slag is converted into hexavalent chromium water solution, fully soaks into the chromium slag through HTHP, and the solubility in acid Cr VI in the chromium slag is fully extracted, and has solved the secondary pollution problem that the crystal calcium chromate causes in the chromium slag;
(4) the employing high pressure vacuum extracts the Cr VI extract in the chromium slag, efficient height;
(5) under high-temperature and high-pressure conditions, adopt no toxicant that the Cr VI in the chromium slag thoroughly is reduced into trivalent chromium, non-secondary pollution;
(6) extract the sexavalence chrome liquor and produce the chromium goods, the nontoxic chromium slag after the processing can be made cement, concrete auxiliary material and building brick aggregate, and good economic benefits is arranged.
Description of drawings
Below in conjunction with accompanying drawing the specific embodiment of the present invention is described in further detail.
Fig. 1 is the process chart of the specific embodiment of the invention.
The specific embodiment
The present invention is applicable to that Cr VI extracts and method of reducing in the chromium slag of a kind of chromium salt production and social survival.
Cr VI extracts with the method for reducing specific embodiment as follows in the chromium slag of a kind of chromium salt production and social survival:
(1) the chromium slag muck deposit or production line on the tank car harbour is installed, artificial or mechanical entrucking;
(2) tank car adopts wheel-track type, box-like porous plate tank car, stainless steel material, and the tank car of filling the chromium slag can directly run in the autoclave, can directly transport autoclave after the work of treatment of chromium slag finishes, and can unload automatically, and the loop orbit return is task again;
(3) adopt horizontal air pressure still, tank, water filling, vacuum system and rail set are installed in still, can accept a plurality of tank cars and enter immersion, pressurization, drawing liquid and chromium slag simultaneously and transport equipment;
(4) configuration sour water workshop and reduction medicament workshop are produced sour water and reduction medicament, and supporting use during for production realizes automatic industrial production;
(5) extraction sexavalence chrome liquor flow process matching running is handled for the chromium slag in configuration sexavalence chrome liquor production of articles workshop;
(6) the nontoxic chromium slag whereabouts engineering of configuration reaches final processing chromium slag purpose.
Claims (7)
1, Cr VI extracts and method of reducing in the chromium slag of a kind of chromium salt production and social survival, it is characterized in that: adopt porous pit to load chromium slag (not must milled processed), through autoclave add water, pressurized high-temperature soaks into, high pressure vacuum extracts the sexavalence chrome liquor in the chromium slag; The calcium chromate that adds in still again in the sour water immersion dissolve chromium slag is converted into hexavalent chromium water solution, and high pressure vacuum extracts the sexavalence chrome liquor in the chromium slag again; Add in still again that remaining Cr VI is transformed into trivalent chromium in reduction medicament (ferrous sulfate) reduced chromium slag, and be fixed in the chromium slag; Gained sexavalence chrome liquor can be made the chromium product, and the nontoxic chromium slag after the processing can be made cement, concrete auxiliary material and building brick aggregate and natural landfill disposal;
2, Cr VI extracts and method of reducing in the chromium slag of a kind of chromium salt production according to claim 1 and social survival, it is characterized in that: characteristics of the present invention are to be applicable to that the chromium slag is handled and social survival's chromium slag processing in the produced in several ways chromic salts process;
3, Cr VI extracts and method of reducing in the chromium slag of a kind of chromium salt production according to claim 1 and social survival, it is characterized in that: the chromium slag must milled processed, directly adopt porous pit to load the chromium slag, fully soak into Cr VI in the chromium slag through HTHP, make in the chromium slag Cr VI fully extracted, reduce the content of 6-valence Cr ions in the chromium slag, also reduced the reduction dosing simultaneously, reduced chromium slag processing cost;
4, Cr VI extracts and method of reducing in the chromium slag of a kind of chromium salt production according to claim 1 and social survival, it is characterized in that: the calcium chromate that sour water soaks in the dissolve chromium slag is converted into hexavalent chromium water solution, fully soak into the chromium slag through HTHP, solubility in acid Cr VI in the chromium slag is fully extracted, solved the secondary pollution problem that the crystal calcium chromate causes in the chromium slag;
5, Cr VI extracts and method of reducing in the chromium slag of a kind of chromium salt production according to claim 1 and social survival, it is characterized in that: adopt the Cr VI extract in the high pressure vacuum extraction chromium slag, the efficient height;
6, Cr VI extracts and method of reducing in the chromium slag of a kind of chromium salt production according to claim 1 and social survival, it is characterized in that: under high-temperature and high-pressure conditions, adopt no toxicant that the Cr VI in the chromium slag thoroughly is reduced into trivalent chromium, non-secondary pollution;
7, Cr VI extracts and method of reducing in the chromium slag of a kind of chromium salt production according to claim 1 and social survival, it is characterized in that: extract the sexavalence chrome liquor and produce the chromium goods, nontoxic chromium slag after the processing can be made cement, concrete auxiliary material and building brick aggregate, and good economic benefits is arranged.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008101082304A CN101288795A (en) | 2008-05-27 | 2008-05-27 | Chromic salt production and extracting and reducing method of hexavalent chromium from chromic slag left behind society |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008101082304A CN101288795A (en) | 2008-05-27 | 2008-05-27 | Chromic salt production and extracting and reducing method of hexavalent chromium from chromic slag left behind society |
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| Publication Number | Publication Date |
|---|---|
| CN101288795A true CN101288795A (en) | 2008-10-22 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNA2008101082304A Pending CN101288795A (en) | 2008-05-27 | 2008-05-27 | Chromic salt production and extracting and reducing method of hexavalent chromium from chromic slag left behind society |
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| CN (1) | CN101288795A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102515622A (en) * | 2011-12-07 | 2012-06-27 | 山东宏艺科技股份有限公司 | Chromium removal grinding aid for cement and preparation method thereof |
| CN103121802A (en) * | 2011-11-18 | 2013-05-29 | 中国科学院过程工程研究所 | Method for preparing magnesium-oxy-chloride cement by utilizing chromium slag produced through salt sub-melting technology |
| CN105887199A (en) * | 2016-04-20 | 2016-08-24 | 中国科学院物理研究所 | Novel compound Ca2CrO4 crystal and preparation method thereof |
-
2008
- 2008-05-27 CN CNA2008101082304A patent/CN101288795A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103121802A (en) * | 2011-11-18 | 2013-05-29 | 中国科学院过程工程研究所 | Method for preparing magnesium-oxy-chloride cement by utilizing chromium slag produced through salt sub-melting technology |
| CN103121802B (en) * | 2011-11-18 | 2014-11-05 | 中国科学院过程工程研究所 | Method for preparing magnesium-oxy-chloride cement by utilizing chromium slag produced through salt sub-melting technology |
| CN102515622A (en) * | 2011-12-07 | 2012-06-27 | 山东宏艺科技股份有限公司 | Chromium removal grinding aid for cement and preparation method thereof |
| CN102515622B (en) * | 2011-12-07 | 2013-09-04 | 山东宏艺科技股份有限公司 | Chromium removal grinding aid for cement and preparation method thereof |
| CN105887199A (en) * | 2016-04-20 | 2016-08-24 | 中国科学院物理研究所 | Novel compound Ca2CrO4 crystal and preparation method thereof |
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Open date: 20081022 |