CN103466709A - Method of comprehensive utilization of chromium-containing sodium hydrogen sulfate - Google Patents
Method of comprehensive utilization of chromium-containing sodium hydrogen sulfate Download PDFInfo
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- CN103466709A CN103466709A CN2013103749421A CN201310374942A CN103466709A CN 103466709 A CN103466709 A CN 103466709A CN 2013103749421 A CN2013103749421 A CN 2013103749421A CN 201310374942 A CN201310374942 A CN 201310374942A CN 103466709 A CN103466709 A CN 103466709A
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Abstract
The invention discloses a method of comprehensive utilization of chromium-containing sodium hydrogen sulfate. The method of the comprehensive utilization of chromium-containing sodium hydrogen sulfate comprises the following steps that water is added to a byproduct, namely chromium-containing sodium hydrogen sulfate melt in a chromic anhydride production process; the byproduct is diluted until the density is 1.4-1.6g/cm<3>; and diluted chromium-containing sodium hydrogen sulfate returns to a sodium dichromate production system, and replaces sulfuric acid to be used for neutralization and acidification of sodium chromate alkaline liquid. According to the method, chromium-containing sodium hydrogen sulfate returns to the sodium dichromate production system, and replaces sulfuric acid to be used for the neutralization and the acidification of the sodium chromate alkaline liquid, so that the production cost is lowered, hexavalent chrome is recovered effectively, the production efficiency is improved, environmental pollution caused by hexavalent chrome is avoided effectively, and energy conservation, emission reduction, environmental protection and efficiency improvement are achieved in the field of chromic salt production. In addition, the method is anti-static, and convenient to operate, increases a utilization ratio of chromic salt, lowers the production cost to a certain extent, and facilitates green industrial production.
Description
Technical field
The invention belongs to the comprehensive utilization technique field of chromic salts, relate in particular to a kind of method of chromium-containing sodium bisulfate comprehensive utilization.
Background technology
The process of Production By Sulfuric Acid Process chromic trioxide is that sodium dichromate 99 mother liquor and sulfuric acid are first mixed to the rear retort that drops in certain step and ratio, the interior temperature of charge of retort is heated to 200～210 ℃ and reacts quiescent settling after 30 minutes, utilizes the sodium pyrosulfate principle natural layering different and immiscible from nonpolar chromic trioxide proportion of polarity.Because of sodium pyrosulfate phase surface tension force chromic trioxide phase surface tension force is large and sodium pyrosulfate in can dissolve a small amount of sexavalent chrome, so after layering chromic trioxide mutually in sulfur acid hydrogen sodium amount few, sodium pyrosulfate is mingled with more chromic trioxide phase in mutually.
The chromic trioxide after layering existed in present production process mutually in sulfur acid hydrogen sodium amount few, sodium pyrosulfate is mingled with more chromic trioxide phase in mutually, is unfavorable for energy-saving and emission-reduction and environmental protection.
Summary of the invention
The purpose of the embodiment of the present invention is to provide a kind of method of chromium-containing sodium bisulfate comprehensive utilization, be intended to solve in present production process the chromic trioxide after layering that exists mutually in sulfur acid hydrogen sodium amount few, sodium pyrosulfate is mingled with more chromic trioxide phase in mutually, is unfavorable for the problem of energy-saving and emission-reduction and environmental protection.
The embodiment of the present invention is achieved in that a kind of method of chromium-containing sodium bisulfate comprehensive utilization, and the method for this chromium-containing sodium bisulfate comprehensive utilization comprises the following steps:
In the chromic trioxide production process by product chromium-containing sodium bisulfate melts at first thin up to density, be 1.4-1.6g/cm3;
Chromium-containing sodium bisulfate after dilution returns to the sodium dichromate 99 production system, replaces neutralization and the acidifying of sulfuric acid for chromium acid sodium alkaline liquid.
Further, the method for this chromium-containing sodium bisulfate comprehensive utilization turns back to neutralization and the acidifying of sodium dichromate 99 production system replacement sulfuric acid for chromium acid sodium alkaline liquid by chromium-containing sodium bisulfate.
The method of chromium-containing sodium bisulfate comprehensive utilization provided by the invention, replace neutralization and the acidifying of sulfuric acid for chromium acid sodium alkaline liquid by chromium-containing sodium bisulfate being turned back to the sodium dichromate 99 production system, not only reduced production cost, and efficient recovery sexavalent chrome, increased productivity effect, effectively prevent again the environmental pollution that sexavalent chrome causes, realized energy-saving and emission-reduction, environmental protection synergy in the chromium salt production field.In addition, the present invention sends out anti-electrostatic, easy to operate, has improved the utilization ratio of chromic salts, has reduced to a certain extent production cost, is conducive to industrial green production.
The accompanying drawing explanation
Fig. 1 is the method flow diagram of the chromium-containing sodium bisulfate comprehensive utilization that provides of the embodiment of the present invention.
Embodiment
In order to make purpose of the present invention, technical scheme and advantage clearer, below in conjunction with embodiment, the present invention is further elaborated.Should be appreciated that specific embodiment described herein, only in order to explain the present invention, is not intended to limit the present invention.
Fig. 1 shows the method flow of chromium-containing sodium bisulfate comprehensive utilization provided by the invention.For convenience of explanation, only show part related to the present invention.
The method of the chromium-containing sodium bisulfate comprehensive utilization of the embodiment of the present invention, the method for this chromium-containing sodium bisulfate comprehensive utilization comprises the following steps:
In the chromic trioxide production process by product chromium-containing sodium bisulfate melts at first thin up to density, be 1.4-1.6g/cm3;
Chromium-containing sodium bisulfate after dilution returns to the sodium dichromate 99 production system, replaces neutralization and the acidifying of sulfuric acid for chromium acid sodium alkaline liquid.
As a prioritization scheme of the embodiment of the present invention, the method for this chromium-containing sodium bisulfate comprehensive utilization turns back to the sodium dichromate 99 production system by chromium-containing sodium bisulfate and replaces neutralization and the acidifying of sulfuric acid for chromium acid sodium alkaline liquid.
Below in conjunction with drawings and the specific embodiments, application principle of the present invention is further described.
As shown in Figure 1, the method for the chromium-containing sodium bisulfate of embodiment of the present invention comprehensive utilization comprises the following steps:
S101: in the chromic trioxide production process by product chromium-containing sodium bisulfate melts at first thin up to finite concentration, general density 1.4-1.6g/cm3;
S102: the chromium-containing sodium bisulfate after dilution returns to the sodium dichromate 99 production system, replaces neutralization and the acidifying of sulfuric acid for chromium acid sodium alkaline liquid,
Concrete steps of the present invention are:
The first step, in the chromic trioxide production process by product chromium-containing sodium bisulfate melts at first thin up to finite concentration, general density 1.4-1.6g/cm3;
Second step, chromium-containing sodium bisulfate after dilution returns to the sodium dichromate 99 production system, replace neutralization and the acidifying of sulfuric acid for chromium acid sodium alkaline liquid, save sulfuric acid on the one hand and reduce costs, reclaiming on the other hand sexavalent chrome not only increases benefit but also effectively prevents the environmental pollution that sexavalent chrome causes.
Principle of work of the present invention is:
The about 1.99g/cm3 of reacted chromium-containing sodium bisulfate melts density, wherein contain approximately 50% sodium sulfate, 45% sulfuric acid and about 5% sexavalent chrome, after layering thoroughly, lower floor's chromic trioxide is discharged and obtained the chromic trioxide finished product through the cooling section of cooling slicing machine, upper strata chromium-containing sodium bisulfate melts is discharged rear thin up and directly return to the sodium dichromate 99 production system after finite concentration, can replace sulfuric acid to be used for neutralization and the acidifying of chromium acid sodium alkaline liquid.
The reaction equation that whole process relates to is as follows:
Chromic trioxide production process: Na2Cr2O7+2H2SO4=2CrO3+2NaHSO4+H2O
Chromium acid sodium alkaline liquid N-process: NaHSO4+NaOH=Na2SO4+H2O
Chromium acid sodium solution acidization: 2NaHSO4+2Na2CrO4=Na2Cr2O7+2Na2SO4+H2O
The specific embodiment of the present invention:
Embodiment 1
Chromic trioxide by product chromium-containing acid melts after dilution, sulfur acid 328g/l, sexavalent chrome (with Na2Cr2O72H2O) 45g/l, replace neutralization and the acidifying of sulfuric acid for chromium acid sodium alkaline liquid, stable processing technique, successful.
Embodiment 2
Chromic trioxide by product chromium-containing acid melts after dilution, sulfur acid 276g/l, sexavalent chrome (with Na2Cr2O72H2O) 38g/l, replace neutralization and the acidifying of sulfuric acid for chromium acid sodium alkaline liquid, stable processing technique, successful.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, all any modifications of doing within the spirit and principles in the present invention, be equal to and replace and improvement etc., within all should being included in protection scope of the present invention.
Claims (2)
1. the method for a chromium-containing sodium bisulfate comprehensive utilization, is characterized in that, the method for this chromium-containing sodium bisulfate comprehensive utilization comprises the following steps:
In the chromic trioxide production process by product chromium-containing sodium bisulfate melts at first thin up to density, be 1.4-1.6g/cm3;
Chromium-containing sodium bisulfate after dilution returns to the sodium dichromate 99 production system, replaces neutralization and the acidifying of sulfuric acid for chromium acid sodium alkaline liquid.
2. the method for chromium-containing sodium bisulfate comprehensive utilization as claimed in claim 1, is characterized in that, the method for this chromium-containing sodium bisulfate comprehensive utilization turns back to the sodium dichromate 99 production system by chromium-containing sodium bisulfate and replaces neutralization and the acidifying of sulfuric acid for chromium acid sodium alkaline liquid.
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| CN2013103749421A CN103466709A (en) | 2013-08-23 | 2013-08-23 | Method of comprehensive utilization of chromium-containing sodium hydrogen sulfate |
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| CN2013103749421A CN103466709A (en) | 2013-08-23 | 2013-08-23 | Method of comprehensive utilization of chromium-containing sodium hydrogen sulfate |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114212821A (en) * | 2022-01-07 | 2022-03-22 | 重庆民丰化工有限责任公司 | Method for producing chromium green by using chromic anhydride by-product |
-
2013
- 2013-08-23 CN CN2013103749421A patent/CN103466709A/en active Pending
Non-Patent Citations (2)
| Title |
|---|
| 潘向雷等: "铬酸酐生产中硫酸氢钠回收利用研究与应用", 《无机盐工业》 * |
| 纪柱: "铬酸酐副产物硫酸氢钠的利用", 《无机盐工业》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114212821A (en) * | 2022-01-07 | 2022-03-22 | 重庆民丰化工有限责任公司 | Method for producing chromium green by using chromic anhydride by-product |
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Application publication date: 20131225 |