CN108046307A - A kind of waste water extraction zinc of iron content containing zinc and the method for preparing zinc oxide - Google Patents
A kind of waste water extraction zinc of iron content containing zinc and the method for preparing zinc oxide Download PDFInfo
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- CN108046307A CN108046307A CN201711363055.9A CN201711363055A CN108046307A CN 108046307 A CN108046307 A CN 108046307A CN 201711363055 A CN201711363055 A CN 201711363055A CN 108046307 A CN108046307 A CN 108046307A
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01G—COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
- C01G9/00—Compounds of zinc
- C01G9/02—Oxides; Hydroxides
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01G—COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
- C01G49/00—Compounds of iron
- C01G49/02—Oxides; Hydroxides
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- Treatment Of Water By Oxidation Or Reduction (AREA)
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Abstract
A kind of waste water extraction zinc of iron content containing zinc and the method for preparing zinc oxide, belong to changing waste into resources field.Its method is：Liquid caustic soda is added in into sludge of the iron content containing zinc, uniform stirring, it is 4 6.5 that waste water of the iron content containing zinc is adjusted pH value at 15 DEG C~35 DEG C, while is passed through oxidizing gas, carries out low-temperature oxidation, and oxidization time is 4 8h.After ferrous oxide complete oxidation, filtering obtains solution, and it is 9 12 that alkaline matter is added at 15 DEG C~35 DEG C and adjusts pH value, obtains white precipitate, filters, 130 DEG C~150 DEG C drying obtain high pure zinc oxide.This method is effective technique of Sewage treatment zinc of the galvanizing factory iron content containing zinc, small with equipment investment, and energy consumption is small and the product purity for preparing is high, it is environment friendly and pollution-free the advantages that.
Description
Technical field
The invention belongs to technical field of waste resourceful treatment, are related to a kind of waste water extraction zinc of iron content containing zinc and prepare
The method of zinc oxide.
Background technology
Zinc oxide is a kind of oxide of zinc.Water is insoluble in, dissolves in acid and highly basic.Zinc oxide is a kind of commonization
Additive is learned, is widely used in plastics, silicate product, synthetic rubber, lubricating oil, paint, ointment, adhesive, food
In the making of the products such as product, battery, fire retardant.The band gap and exciton bind energy of zinc oxide are larger, and transparency is high, has excellent
Room temperature luminescent properties have application in the products such as the liquid crystal display, thin film transistor (TFT), light emitting diode of semiconductor applications.
In addition, the zinc oxide of microparticle also begins to play a role in association area as a kind of nano material.
Galvanizing is that the metals such as steel, stainless steel, cast iron are immersed in fused solution metal or alloy to the one kind for obtaining coating
Technology.Galvanizing is most widely used, steel surface processing method that the ratio of performance to price is optimal in the world today.Galvanizing
Product lengthens the life to the corrosion inhibitor of steel, energy-saving material-saving plays inestimable and irreplaceable role, while electroplated steel products are also state
The high added value undersupplied product that family fosters and first develops.With the implementation of strategy to develop western regions, transferring electricity from the west to the east, western gas east
The deep expansion of the projects such as the defeated, south water to north, Three Gorges Projects, rural power grids and the net transformation of urban distribution network two, China's galvanizing industry is
Into the high speed development stage of a new round.
Waste water of the iron content containing zinc that galvanizing factory generates simultaneously is a kind of pollution of galvanizing factory workshop acid washing water discharge
Industrial wastewater, since each manufacturer's technique is different, usual iron-holder is between 0.6g/L~3g/L, zinc 0.1g/L~0.3g/
L.The major pollutants that wherein waste water includes are iron chloride, frerrous chloride, zinc chloride etc., and in addition waste water is adopted in most galvanizing factories
With directly plus the method that purifies of alkali and then press filtration, can generate in this process a large amount of iron content containing zinc and aqueous solid slag it is red
Mud, during stacking in addition to occupying substantial amounts of soil, some of which chemical composition can also infiltrate these red soil with water
Soil easily causes composition, structure and the deterioration of its physico-chemical property in soil, and more seriously this high discarded object containing zinc generates
Sewage permeate the ground and easily cause underground water pollution, make its Groundwater formation heavy metal pollution, while also easily cause the wave of resource
Take.
So far, the method for zinc being extracted from waste water is extraction separation iron and zinc mostly, by the Fe containing zinc2+Solution with
Extractant counter current contacting, mixing are extracted, and oil-water ratio is (1~4)：1, extraction time is 4~6Min, quiet after the completion of extraction
16~20Min is only clarified, oil removal, obtains the load organic phases containing zinc and zinc content is less than the hydroxide ferrous solution of 1g/L.
Stripping process prepares zinc hydroxide, and purity is higher.However, its technics comparing is cumbersome, industrialization cost compares
Height, for the relatively low solution efficacy unobvious of zinc content, the economic benefit is not high.
The content of the invention
In view of the problems of the existing technology, the present invention provides a kind of waste water extraction zinc of iron content containing zinc and prepares zinc oxide
Method, solution of the obtained iron content containing zinc using the present invention is produced to the zinc oxide of high-purity, waste water is turned waste into wealth, is disappeared
Except the secondary pollution of waste water, ecological environment is protected.Compared with upper person, its main feature is that easy to operate, process equipment requirement is low,
The zinc oxide of high-purity can be obtained with means at low cost.
In order to achieve the above object, the technical scheme is that：
A kind of waste water extraction zinc of iron content containing zinc and the method for preparing zinc oxide, comprise the following steps：
Step 1, lye is added in
Under the conditions of 15 DEG C~35 DEG C, lye, uniform stirring are added in into waste water of the iron content containing zinc, adjusting pH value is 4-
6.5, zinc-iron-containing solution is obtained, contains ferrous hydroxide in the zinc-iron-containing solution；Wherein, the mass percent of lye is dense
It spends for 15%~45%.
Step 2, low-temperature oxidation
At room temperature, oxidizing gas is passed through in the zinc-iron-containing solution that step 2 obtains, makes the Fe of its part2+It is aoxidized
Into Fe3+, oxidization time 4-8h.Yellowish-brown is presented in solution, then oxidation is fully completed.
Step 3, iron and zinc are separated by filtration
Zinc-iron-containing solution after the oxidation that step 2 is obtained is filtered processing, obtains filter cake and the solution containing zinc；Filter
Cake is ferric hydroxide colloid.
Step 4, zinc oxide is prepared
By the zinc-containing solution that step 3 obtains under the conditions of 15 DEG C~35 DEG C, it is 9-12 to add in alkaline matter and adjust pH value, is obtained
To white precipitate, filter cake and filtrate is obtained by filtration.After filter cake is fully washed, dried under the conditions of 130 DEG C~150 DEG C
Dry-cure obtains the zinc oxide of high-purity.
Waste water of the iron content containing zinc is what is generated in galvanizing production process, and the concentration of wherein each component is：Fe:
0.6g/L~3g/L, Zn:0.1g/L~0.3g/L, surplus are water.In waste water of the iron content containing zinc, form existing for Fe elements is
Iron chloride frerrous chloride, form existing for Zn elements are zinc chloride, wherein, the mixed proportion of each substance is arbitrary ratio.
The lye is sodium hydroxide, and mass fraction is 15~45wt%.
The oxidizing gas is oxygen or air, and wherein air pressure is 0.4~0.6MPa.
Compared with prior art, the beneficial effects of the invention are as follows：1) present invention can eliminate the secondary pollution of sludge, protection
Ecological environment realizes the effects of resource circle utilization of refuse reclamation.2) present invention meets the industry political affairs that China saves emission reduction
Plan, investment is small, and equipment requirement is low, puies forward the efficient of iron.3) present invention solves the problems, such as sludge no pollution, and technique is closed circuit
, no longer generate liquid and waste slag produced, easy to operate, flow is short.
Specific embodiment
With reference to embodiment, the present invention is described in further detail.
Waste water of the iron content that following embodiment uses containing zinc for galvanizing production process in generate, wherein concentration is：Fe:
0.6g/L~3g/L, Zn:0.1g/L~0.3g/L, surplus are water.Wherein in waste water of the iron content containing zinc, form existing for Fe elements
For iron chloride, frerrous chloride, form existing for Zn elements is zinc chloride, wherein, the mixed proportion of each substance is arbitrary ratio.
Embodiment 1
2L waste water is taken to be put into beaker, lye is added in into waste water of the iron content containing zinc (mass percent concentration is 15%)
25ml, it is 4.5 to adjust pH value, obtains the solution containing ferrous hydroxide.
Oxygen is passed through in ferrous hydroxide liquid to containing, wherein air pressure is 0.5MPa.Make the Fe of its part2+It is oxidized to Fe3 +, oxidization time 4h continuously adds lye 11ml during this, its pH value is made to be maintained at 5, yellowish-brown is presented in solution, then oxygen
Change and fully complete.
The zinc-iron-containing solution of oxidation is filtered, obtains filter cake and the solution containing zinc.Filter cake is ferric hydroxide colloid.
After filter cake is washed, 6h is dried under the conditions of 80 DEG C, it is carried out to be weighed as 2.15g, it is ground
It can obtain the iron oxide of high-purity.
The zinc-containing solution of filtering is added in into sodium hydroxide and adjusts pH value to 10, white precipitate is obtained and filter cake is obtained by filtration
And filtrate.Filter cake 0.31g is subjected to 130 DEG C of zinc oxide dried 4h and can obtain high-purity.
Embodiment 2
2L waste water is taken to be put into beaker, lye is added in into waste water of the iron content containing zinc (mass percent concentration is 30%)
13ml adjusts pH value and obtains the solution containing iron hydroxide for 5.5.
Oxygen is passed through in ferrous hydroxide liquid to containing, wherein air pressure is 0.5MPa.Make the Fe of its part2+It is oxidized to Fe3 +, oxidization time 4h, solution shows yellowish-brown by light green color, then oxidation is fully completed.
The zinc-iron-containing solution of oxidation is filtered, obtains the filter cake for ferric hydroxide colloid and the solution containing zinc.
After filter cake is washed, 6h is dried under the conditions of 80 DEG C, it is carried out to be weighed as 2.15g, it is ground
It can obtain the iron oxide of high-purity.
The zinc-containing solution of filtering is added in into lye and adjusts pH value to 9, white precipitate is obtained and filter cake and filter is obtained by filtration
Liquid.Filter cake 0.34g is subjected to 150 DEG C of zinc oxide dried 4h and can obtain high-purity.
Embodiment 3
2L waste water is taken to be put into beaker, lye is added in into waste water of the iron content containing zinc (mass percent concentration is 45%)
10ml adjusts pH value and obtains the solution containing iron hydroxide for 6.
Air is passed through in ferrous hydroxide liquid to containing, wherein air pressure is 0.4MPa.Make the Fe of its part2+It is oxidized to Fe3 +, solution shows yellowish-brown by light green color, then oxidation is fully completed.
The zinc-iron-containing solution of oxidation is filtered, obtains the filter cake for ferric hydroxide colloid and the solution containing zinc.
After filter cake is washed, 6h is dried under the conditions of 80 DEG C, the oxidation that can obtain high-purity is ground to it
Iron.
The zinc-containing solution of filtering is added in into lye and adjusts pH value to 12, white precipitate is obtained and filter cake and filter is obtained by filtration
Liquid.Filter cake 130 DEG C of drying of progress are obtained into the zinc oxide of high-purity.
Claims (8)
1. a kind of waste water extraction zinc of iron content containing zinc and the method for preparing zinc oxide, it is characterised in that following steps：
Step 1, lye is added in
Under the conditions of 15 DEG C~35 DEG C, lye, uniform stirring are added in into waste water of the iron content containing zinc, adjusting pH value is 4-6.5, is obtained
To zinc-iron-containing solution；Contain ferrous hydroxide in the zinc-iron-containing solution；
Step 2, low-temperature oxidation
At room temperature, oxidizing gas is passed through in the zinc-iron-containing solution that step 2 obtains, makes the Fe of its part2+It is oxidized to Fe3 +, oxidization time 4-8h；Yellowish-brown is presented in solution, then oxidation is fully completed；
Step 3, iron and zinc are separated by filtration
Zinc-iron-containing solution after the oxidation that step 2 is obtained is filtered processing, obtains filter cake and the solution containing zinc；Filter cake is
Ferric hydroxide colloid；
Step 4, zinc oxide is prepared
By the zinc-containing solution that step 3 obtains under the conditions of 15 DEG C~35 DEG C, it is 9-12 to add in alkaline matter and adjust pH value, is obtained white
Color precipitates, and filter cake and filtrate is obtained by filtration；After filter cake is fully washed, drying obtains zinc oxide.
2. a kind of waste water of the iron content according to claim 1 containing zinc extracts zinc and the method for preparing zinc oxide, feature exist
In waste water of the iron content containing zinc is what is generated in galvanizing production process in the step 1, and the concentration of wherein each component is：Fe:
0.6g/L~3g/L, Zn:0.1g/L~0.3g/L, surplus are water；In waste water of the iron content containing zinc, form existing for Fe elements is
Iron chloride frerrous chloride, form existing for Zn elements are zinc chloride, wherein, the mixed proportion of each substance is arbitrary ratio.
3. a kind of waste water extraction zinc of the iron content according to claim 1 or 2 containing zinc and the method for preparing zinc oxide, feature
It is, the oxidizing gas is oxygen or air, and wherein air pressure is 0.4~0.6MPa.
4. a kind of waste water extraction zinc of the iron content according to claim 1 or 2 containing zinc and the method for preparing zinc oxide, feature
It is, the lye is sodium hydroxide, and mass fraction is 15~45wt%.
5. a kind of waste water of the iron content according to claim 3 containing zinc extracts zinc and the method for preparing zinc oxide, feature exist
In the lye is sodium hydroxide, and mass fraction is 15~45wt%.
6. a kind of waste water extraction zinc of the iron content according to claim 1 or 2 or 5 containing zinc and the method for preparing zinc oxide,
It is characterized in that, the drying temperature of the step 4 is 130 DEG C~150 DEG C.
7. a kind of waste water of the iron content according to claim 3 containing zinc extracts zinc and the method for preparing zinc oxide, feature exist
In the drying temperature of the step 4 is 130 DEG C~150 DEG C.
8. a kind of waste water of the iron content according to claim 4 containing zinc extracts zinc and the method for preparing zinc oxide, feature exist
In the drying temperature of the step 4 is 130 DEG C~150 DEG C.
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| CN201711363055.9A CN108046307A (en) | 2017-12-18 | 2017-12-18 | A kind of waste water extraction zinc of iron content containing zinc and the method for preparing zinc oxide |
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| CN201711363055.9A CN108046307A (en) | 2017-12-18 | 2017-12-18 | A kind of waste water extraction zinc of iron content containing zinc and the method for preparing zinc oxide |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110683572A (en) * | 2019-09-23 | 2020-01-14 | 海西华汇化工机械有限公司 | Method for preparing nano zinc oxide from hot-dip galvanizing slag |
| CN112110474A (en) * | 2020-07-24 | 2020-12-22 | 浙江工业大学 | Method for preparing ZnO nano material by using zinc-containing wastewater |
| CN112439387A (en) * | 2020-12-08 | 2021-03-05 | 安徽泰龙锌业有限责任公司 | Purification material for industrial wastewater treatment prepared from zinc-containing waste |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1116611A (en) * | 1994-08-08 | 1996-02-14 | 赵润玲 | Treatment of waste galvanized water with its treating agent and method for recovery of precipitate |
| CN103145176A (en) * | 2013-02-04 | 2013-06-12 | 唐山海港合缘锌业有限公司 | High-activity empty frame zinc oxide production method by means of industrial zinciferous smoke dust |
| CN105696010A (en) * | 2016-01-12 | 2016-06-22 | 惠州市斯瑞尔环境化工有限公司 | Method for recycling iron and zinc containing waste hydrochloric acid solution |
| CN106853982A (en) * | 2017-01-20 | 2017-06-16 | 河北长力金属制品有限公司 | A kind of preparation method of high-purity zinc oxide |
-
2017
- 2017-12-18 CN CN201711363055.9A patent/CN108046307A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1116611A (en) * | 1994-08-08 | 1996-02-14 | 赵润玲 | Treatment of waste galvanized water with its treating agent and method for recovery of precipitate |
| CN103145176A (en) * | 2013-02-04 | 2013-06-12 | 唐山海港合缘锌业有限公司 | High-activity empty frame zinc oxide production method by means of industrial zinciferous smoke dust |
| CN105696010A (en) * | 2016-01-12 | 2016-06-22 | 惠州市斯瑞尔环境化工有限公司 | Method for recycling iron and zinc containing waste hydrochloric acid solution |
| CN106853982A (en) * | 2017-01-20 | 2017-06-16 | 河北长力金属制品有限公司 | A kind of preparation method of high-purity zinc oxide |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110683572A (en) * | 2019-09-23 | 2020-01-14 | 海西华汇化工机械有限公司 | Method for preparing nano zinc oxide from hot-dip galvanizing slag |
| CN112110474A (en) * | 2020-07-24 | 2020-12-22 | 浙江工业大学 | Method for preparing ZnO nano material by using zinc-containing wastewater |
| CN112439387A (en) * | 2020-12-08 | 2021-03-05 | 安徽泰龙锌业有限责任公司 | Purification material for industrial wastewater treatment prepared from zinc-containing waste |
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Application publication date: 20180518 |
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