CN101695625A - Method for treating tail gas generated by preparing nickel sulfate solution by metal nickel method - Google Patents
Method for treating tail gas generated by preparing nickel sulfate solution by metal nickel method Download PDFInfo
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- CN101695625A CN101695625A CN200910193422A CN200910193422A CN101695625A CN 101695625 A CN101695625 A CN 101695625A CN 200910193422 A CN200910193422 A CN 200910193422A CN 200910193422 A CN200910193422 A CN 200910193422A CN 101695625 A CN101695625 A CN 101695625A
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- nickel
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- sulfate solution
- nickel sulfate
- sodium nitrate
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Abstract
The invention discloses a method for treating tail gas generated by preparing nickel sulfate solution by a metal nickel method, which comprises the following steps: vacuumizing adsorption equipment, and introducing the oxynitride tail gas generated by synthesizing the nickel sulfate solution by the metal nickel method into the adsorption device; and adopting alkali liquor and hydrogen peroxide solution as absorption solution, and performing reaction to obtain a byproduct sodium nitrate. Aiming at the defect that a large amount of oxynitride byproduct is generated when the nickel sulfate solution is synthesized by the metal nickel method, the invention provides a clean production process in which the alkali liquor and the hydrogen peroxide solution are adopted as absorbents and high purity byproduct sodium nitrate is produced; raw materials adopted by the method do not have byproducts, and after the reaction is finished, sodium nitrate solution can be directly obtained; the alkali liquor and the hydrogen peroxide solution are adopted as absorbents so as to basically realize zero emission of the oxynitride; meanwhile, the method produces the byproduct sodium nitrate, the utilization rate of nitric acid is improved, and the method is the clean production process for producing the nickel sulfate; therefore, the method has good economical and social benefits.
Description
Technical field
The invention belongs to the clearer production technology field, particularly a kind of exhaust gas treating method that utilizes the metallic nickel legal system to be equipped with nickel sulfate solution.
Background technology
Nickel sulfate solution is widely used in industries such as semiconductor, printed circuit board (pcb), battery, chemical plating, plating, it is the main nickel salt of electronickelling and alloy, chemical nickel plating and alloy and battery, also be the main source of metallic nickel ions, also can be used as additive in cadmium plating, when zinc-plated.Be used as production Raney nickel and other nickel salts such as nickel chloride, nickel oxide, nickelous carbonate etc. in the inorganic industry.In addition, nickelous sulfate also is used to make mordant, metallochrome of catalyst, the reducing dye of nickel-cadmium cell, fixed oil or paint etc.
The production method of nickel sulfate solution has two kinds: a kind of is to adopt electrolytic nickel directly synthetic as raw material, it is reported that U.S. Univertical company is a raw material with the electrolytic nickel, has produced the nickelous sulfate of content of impurities less than 20ppm; Another kind is to make after purifying with the nickelous sulfate crude product.Produce in the nickelous sulfate technical process in the metallic nickel method, nickel and rare nitric acid and sulfuric acid reaction generate nickel sulfate solution, produce a large amount of poisonous oxides of nitrogen gas simultaneously.Because it is restive that reaction acutely, is reflected in the closed reactor, can cause blast when serious, therefore reacts in the opening reactor mostly, the nitrogen oxide toxic gas that causes producing in the course of reaction directly is discharged in the atmosphere serious environment pollution.Therefore, develop a kind of clearer production technology, the nitrogen oxide accessory substance that discharges during can low-cost processes metallic nickel method synthetic nickel sulfate solution, significant and good application prospects.
Summary of the invention
In order to solve above-mentioned the deficiencies in the prior art part, the object of the present invention is to provide a kind of metallic nickel legal system to be equipped with the exhaust gas treating method of nickel sulfate solution; It is absorbent that the tail gas that this method produces when the metallic nickel legal system is equipped with nickel sulfate solution adopts alkali lye and hydrogen peroxide, the sodium nitrate that by-product purity is higher.
Purpose of the present invention is achieved through the following technical solutions: a kind of metallic nickel legal system is equipped with the exhaust gas treating method of nickel sulfate solution, this method may further comprise the steps: absorption plant is vacuumized, the nitrogen oxide tail gas that produces when then the metallic nickel method being synthesized nickel sulfate solution is introduced absorption plant, adopt alkali lye and hydrogenperoxide steam generator as absorption liquid, reaction obtains the sodium nitrate byproduct.
Described nitrogen oxide tail gas is nitrogen dioxide (NO
2); Described alkali lye is that mass percent concentration is 5～10% NaOH (NaOH) solution; Described hydrogenperoxide steam generator is the hydrogen peroxide (H of mass percent concentration 12～25%
2O
2) solution.
The addition of described alkali lye is 1.1: 1～1.3: 1 in the mol ratio of NaOH and nitrogen dioxide.
The addition of described hydrogenperoxide steam generator is 1.1: 2～1.5: 2 in the mol ratio of hydrogen peroxide and nitrogen dioxide.
Described reaction is a normal-temperature reaction.
In the present invention, alkali lye is recycled,, replenish fresh alkali lye and hydrogenperoxide steam generator simultaneously to reach desirable assimilation effect; After absorption liquid recycles 10～15 times, regularly concentrate the sodium nitrate byproduct.
Principle of the present invention is: produce in the nickel sulfate solution technical process in the metallic nickel method, nickel and rare nitric acid and sulfuric acid reaction generate nickel sulfate solution, produce a large amount of poisonous oxides of nitrogen gas simultaneously, and chemical equation is as follows:
Ni+H
2SO
4+2HNO
3＝NiSO
4+2H
2O+2NO
2
Among the present invention, utilize the course of reaction of alkali lye and hydrogenperoxide steam generator absorbing NOx as follows:
2NaOH+3NO
2+H
2O＝2NaNO
3+NO+2H
2O
2H
2O
2=2H
2O+O
2(base catalysis decomposition)
2NO+O
2＝2NO
2
Net reaction is:
4NaOH+4NO
2+2H
2O
2＝4NaNO
3+4H
2O
Hydrogen peroxide decomposes the nascent oxygen that produces and has very strong oxidation activity under alkali condition, do not bring impurity simultaneously again into; Decompose because of can there be partial invalidity in hydrogen peroxide under alkali condition, therefore require hydrogen peroxide suitably excessive in the present invention.
The present invention compared with prior art, have following advantage and beneficial effect: the present invention is directed to the shortcoming that produces a large amount of nitrogen oxide accessory substances when the metallic nickel method is synthesized nickel sulfate solution, it is absorbent that a kind of employing alkali lye and hydrogen peroxide are provided, the process for cleanly preparing of the sodium nitrate that by-product purity is higher; The raw material no coupling product that this method adopted, reaction can directly obtain sodium nitrate solution after finishing; Adopting alkali lye and hydrogen peroxide is absorbent, can realize the zero-emission of nitrogen oxide substantially, and by-product sodium nitrate has improved the nitric acid utilization rate simultaneously, is the process for cleanly preparing of producing nickelous sulfate; Therefore, the present invention has good economic and social benefit.
Description of drawings
Fig. 1 is a process flow diagram of the present invention.
The specific embodiment
Below in conjunction with embodiment, the present invention is done detailed description further, but embodiments of the present invention are not limited to this.
Embodiment 1
1kg high purity nickel plate cleaned with dilute sulfuric acid and washing agent be placed in anti-sulfuric acid that volume is 50L, the nitric acid reaction still, the sealing back is slowly injected sulfuric acid and nitric acid continuously, and to carry out nickelous sulfate control synthetic, filters and obtain the high-purity sulphuric acid nickel solution; Absorption plant is vacuumized, the nitrogen oxide tail gas that produces when then above-mentioned metallic nickel method being synthesized nickel sulfate solution is introduced absorption plant, at normal temperatures, adopting mass percent concentration is that as absorption liquid, absorption reaction obtains sodium nitrate solution for the hydrogenperoxide steam generator (mol ratio in hydrogen peroxide and nitrogen dioxide is 1.1: 2) of 5% sodium hydroxide solution (mol ratio in NaOH and nitrogen dioxide is 1.1: 1) and mass percent concentration 25%; Constantly replenish the sodium hydroxide solution (sodium hydroxide solution can recycle) and the hydrogenperoxide steam generator of above-mentioned concentration, when total consumption of sodium hydroxide solution and hydrogenperoxide steam generator reached 28kg and 2.4kg respectively, enrichment obtained sodium nitrate 2.7kg.
Process flow diagram of the present invention is seen accompanying drawing 1.
Embodiment 2
10kg high purity nickel plate cleaned with dilute sulfuric acid and washing agent be placed in anti-sulfuric acid that volume is 200L, the nitric acid reaction still, the sealing back is slowly injected sulfuric acid and nitric acid continuously, and to carry out nickelous sulfate control synthetic, filters and obtain the high-purity sulphuric acid nickel solution; Absorption plant is vacuumized, the nitrogen oxide tail gas that produces when then above-mentioned metallic nickel method being synthesized nickel sulfate solution is introduced absorption plant, at normal temperatures, adopting mass percent concentration is that as absorption liquid, absorption reaction obtains sodium nitrate solution for the hydrogenperoxide steam generator (mol ratio in hydrogen peroxide and nitrogen dioxide is 1.5: 2) of 10% sodium hydroxide solution (mol ratio in NaOH and nitrogen dioxide is 1.3: 1) and mass percent concentration 12%; Constantly replenish the sodium hydroxide solution (sodium hydroxide solution can recycle) and the hydrogenperoxide steam generator of above-mentioned concentration, when total consumption of sodium hydroxide solution and hydrogenperoxide steam generator reached 140kg and 48kg respectively, enrichment obtained sodium nitrate 27kg.
Embodiment 3
8kg high purity nickel plate cleaned with dilute sulfuric acid and washing agent be placed in anti-sulfuric acid that volume is 120L, the nitric acid reaction still, the sealing back is slowly injected sulfuric acid and nitric acid continuously, and to carry out nickelous sulfate control synthetic, filters and obtain the high-purity sulphuric acid nickel solution; Absorption plant is vacuumized, the nitrogen oxide tail gas that produces when then above-mentioned metallic nickel method being synthesized nickel sulfate solution is introduced absorption plant, at normal temperatures, adopting mass percent concentration is that as absorption liquid, absorption reaction obtains sodium nitrate solution for the hydrogenperoxide steam generator (mol ratio in hydrogen peroxide and nitrogen dioxide is 1.2: 2) of 8% sodium hydroxide solution (mol ratio in NaOH and nitrogen dioxide is 1.2: 1) and mass percent concentration 20%; Constantly replenish the sodium hydroxide solution (sodium hydroxide solution can recycle) and the hydrogenperoxide steam generator of above-mentioned concentration, when total consumption of sodium hydroxide solution and hydrogenperoxide steam generator reached 110kg and 36kg respectively, enrichment obtained sodium nitrate 20kg.
Embodiment 4
5kg high purity nickel plate cleaned with dilute sulfuric acid and washing agent be placed in anti-sulfuric acid that volume is 80L, the nitric acid reaction still, the sealing back is slowly injected sulfuric acid and nitric acid continuously, and to carry out nickelous sulfate control synthetic, filters and obtain the high-purity sulphuric acid nickel solution; Absorption plant is vacuumized, the nitrogen oxide tail gas that produces when then above-mentioned metallic nickel method being synthesized nickel sulfate solution is introduced absorption plant, at normal temperatures, adopting mass percent concentration is that as absorption liquid, absorption reaction obtains sodium nitrate solution for the hydrogenperoxide steam generator (mol ratio in hydrogen peroxide and nitrogen dioxide is 1.4: 2) of 6% sodium hydroxide solution (mol ratio in NaOH and nitrogen dioxide is 1.1: 1) and mass percent concentration 16%; Constantly replenish the sodium hydroxide solution (sodium hydroxide solution can recycle) and the hydrogenperoxide steam generator of above-mentioned concentration, when total consumption of sodium hydroxide solution and hydrogenperoxide steam generator reached 80kg and 25kg respectively, enrichment obtained sodium nitrate 16kg.
Embodiment 5
15kg high purity nickel plate cleaned with dilute sulfuric acid and washing agent be placed in anti-sulfuric acid that volume is 300L, the nitric acid reaction still, the sealing back is slowly injected sulfuric acid and nitric acid continuously, and to carry out nickelous sulfate control synthetic, filters and obtain the high-purity sulphuric acid nickel solution; Absorption plant is vacuumized, the nitrogen oxide tail gas that produces when then above-mentioned metallic nickel method being synthesized nickel sulfate solution is introduced absorption plant, at normal temperatures, adopting mass percent concentration is that as absorption liquid, absorption reaction obtains sodium nitrate solution for the hydrogenperoxide steam generator (mol ratio in hydrogen peroxide and nitrogen dioxide is 1.4: 2) of 10% sodium hydroxide solution (mol ratio in NaOH and nitrogen dioxide is 1.1: 1) and mass percent concentration 25%; Constantly replenish the sodium hydroxide solution (sodium hydroxide solution can recycle) and the hydrogenperoxide steam generator of above-mentioned concentration, when total consumption of sodium hydroxide solution and hydrogenperoxide steam generator reached 250kg and 55kg respectively, enrichment obtained sodium nitrate 34kg.
The foregoing description is a preferred implementation of the present invention; but embodiments of the present invention are not restricted to the described embodiments; other any do not deviate from change, the modification done under spiritual essence of the present invention and the principle, substitutes, combination, simplify; all should be the substitute mode of equivalence, be included within protection scope of the present invention.
Claims (5)
1. a metallic nickel legal system is equipped with the exhaust gas treating method of nickel sulfate solution, it is characterized in that comprising following operating procedure: absorption plant is vacuumized, the nitrogen oxide tail gas that produces when then the metallic nickel method being synthesized nickel sulfate solution is introduced absorption plant, adopt alkali lye and hydrogenperoxide steam generator as absorption liquid, reaction obtains the sodium nitrate byproduct.
2. a kind of metallic nickel legal system according to claim 1 is equipped with the exhaust gas treating method of nickel sulfate solution, it is characterized in that: described nitrogen oxide tail gas is nitrogen dioxide; Described alkali lye is that mass percent concentration is 5～10% sodium hydroxide solution; Described hydrogenperoxide steam generator is the hydrogenperoxide steam generator of mass percent concentration 12～25%.
3. a kind of metallic nickel legal system according to claim 1 is equipped with the exhaust gas treating method of nickel sulfate solution, it is characterized in that: the addition of described alkali lye is 1.1: 1～1.3: 1 in the mol ratio of NaOH and nitrogen dioxide.
4. a kind of metallic nickel legal system according to claim 1 is equipped with the exhaust gas treating method of nickel sulfate solution, it is characterized in that: the addition of described hydrogenperoxide steam generator is 1.1: 2～1.5: 2 in the mol ratio of hydrogen peroxide and nitrogen dioxide.
5. a kind of metallic nickel legal system according to claim 1 is equipped with the exhaust gas treating method of nickel sulfate solution, it is characterized in that: described reaction is a normal-temperature reaction.
Priority Applications (1)
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|---|---|---|---|
| CN200910193422A CN101695625A (en) | 2009-10-29 | 2009-10-29 | Method for treating tail gas generated by preparing nickel sulfate solution by metal nickel method |
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|---|---|---|---|
| CN200910193422A CN101695625A (en) | 2009-10-29 | 2009-10-29 | Method for treating tail gas generated by preparing nickel sulfate solution by metal nickel method |
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|---|---|
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9600178B2 (en) | 2011-05-24 | 2017-03-21 | Lg Electronics Inc. | Mobile terminal |
| CN112657325A (en) * | 2019-10-15 | 2021-04-16 | 中国石油化工股份有限公司 | Method for removing nitrogen oxides from gas |
-
2009
- 2009-10-29 CN CN200910193422A patent/CN101695625A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9600178B2 (en) | 2011-05-24 | 2017-03-21 | Lg Electronics Inc. | Mobile terminal |
| CN112657325A (en) * | 2019-10-15 | 2021-04-16 | 中国石油化工股份有限公司 | Method for removing nitrogen oxides from gas |
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Application publication date: 20100421 |