CN1007134B - Steam method for treating chromium slag - Google Patents
Steam method for treating chromium slagInfo
- Publication number
- CN1007134B CN1007134B CN 85106006 CN85106006A CN1007134B CN 1007134 B CN1007134 B CN 1007134B CN 85106006 CN85106006 CN 85106006 CN 85106006 A CN85106006 A CN 85106006A CN 1007134 B CN1007134 B CN 1007134B
- Authority
- CN
- China
- Prior art keywords
- slag
- chromium slag
- chromium
- pulp
- pressure
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
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- Processing Of Solid Wastes (AREA)
Abstract
The present invention relates to a steam conversion method for treating chromium slag, which is a method of the reductive treatment of the chromium slag in a wet type. Waste water of the production of monosodium glutamate or fine honey and the chromium slag waiting to be treated are mixed to be slag pulp, and the slag pulp is placed an enclosed container to be heated. Cr6 in the slag is reduced to be Cr3 by discharging excessive steam, controlling pressure to be from 0.5 to 7 Kg/cm<2> (gauge pressure) and treating the slag pulp in superheated steam whose temperature is from 320 to 360 DEG C for 30 minutes. The method has the advantages of high reduction ratio, simple technology, low energy consumption, no consumption of chemicals and low equipment investment and treatment cost, and is suitable for the mass treatment of the chromium slag on production. THe reduced slag has good stability after being neutralized to be almost neutral by waste acid, and Cr<+6> can not be generated when the slag is placed in the open air for a long time.
Description
Steam method for treating chromium slag is the method that the chromium slag is handled in a kind of wet type reduction
Chromic salts is a kind of common used in industry raw material and since in the chromium salt production process chromium slag of being discharged contain about 0.5～1.5% to the virulent Cr VI (Cr of human body
+ 6) so the Cr in the elimination chromium slag
+ 6Just become the technical problem that the development chromium salt production must solve.
The method of existing known wet-treating chromium slag normally is made into slag with sulfur-bearing reductant solution and chromium slag and starches, and is that normal pressure, temperature are under the condition about 100 ℃, with the Cr in the chromium slag at pressure
+ 6Be reduced into Cr
+ 3, but the remaining Cr of this method
+ 6Height, the chromium slag after the processing has Cr
+ 6The rise phenomenon takes place, so do not reach the purpose of detoxifcation fully.In order to improve percent reduction, ten people such as Soviet Union's certificate of invention 969674,19821030 B II Cepega have announced a kind of method of new processing chromium slag, and this method is to be made into the slag slurry with sulphur and alkali metal sulphide and chromium slag, under 120～160 ℃ of temperature conditions, reduce processing.But the chromium slag Cr after this method is handled
+ 6Still have the rise phenomenon to take place.Above-mentioned these methods also exist processing technological flow longer, and equipment investment is bigger, and processing cost is than higher common drawback.
Task of the present invention provides a kind of percent reduction height, the chromium slag Cr after the processing
+ 6No rise phenomenon takes place, and technology is simple, equipment investment, the low chromium slag processing method of disposal cost.
The present invention is achieved in that it promptly is to use the waste water or the molasses containing waste water of fermentation glutamate production to mix with the chromium slag, and its liquid-solid ratio is 0.6～0.8, behind the stirring slagging slurry, places airtight vessel in heating, is 0.5～7kg/cm at pressure
2(gauge pressure) is not less than in the superheated steam atmosphere of 320 ℃ of temperature, reduces 30 minutes, slags tap under normal pressure, adds the spent acid neutralization, makes the pH value of slag reach 6～8.
The advantage of this method is the percent reduction height, can reach 100%, and the chromium slag is detoxified fully, and the chromium slag after the processing is through long-term its Cr that places
+ 6No rise phenomenon takes place, do not produce secondary pollution, for the chromium slag utilization after handling provides condition, because the reducing agent that uses is fermentation gustatory production wastewater or molasses containing waste water, the heat in the superheated steam can be recycled in addition, and energy resource consumption is low, technological process is short, equipment investment is few, and the disposal cost of chromium slag is low, and this method is applicable to mass disposal chromium slag.
Embodiment:
Example 1, at first with weight be 500 the gram, granularity was 60 mesh sieves, contained Cr
+ 6Be that 1.5%, 110 ℃ of weightlessness is that 12.4% chromium slag and 300 milliliters of proportion are 1.03 to contain the fermentation gourmet powder waste water mixing of amino acid 0.8%, stir the slagging slurry.
Put slag then and starch airtight vessel in heating in electric heating, the pressure in container surpasses 7kg/cm
2When (gauge pressure), the exhaust valve opening steam discharge on the container is when container inner pressure is lower than 0.5kg/cm
2When (gauge pressure), exhaust valve closure, the temperature in container rise to 320 ℃, are incubated 30 minutes, open air bleeding valve then, deslagging when making the interior pressure of container reduce to normal pressure, slag enters in the corrosion resistant container, stir on one side,, its pH value is dropped to till 7 Yi Bian slowly add sulfur waste acid.
Through the chromium slag of this law processing, according to state specified standards method sample analysis, Cr as a result
+ 6Do not detect.With this slag is open-air place 240 days after, sample analysis Cr again
+ 6Do not detect yet.
Example 2, chromium slag, reducing agent, technological process are with example 1.
The result of the test of different temperatures and liquid-solid ratio:
The temperature dreg slurry is solid in the container handles Cr in the slag of back than temperature retention time
+ 6Content
(℃) (minute) (PPm)
180-240 0.8 30 200
260-300 0.8 30 18
320-360 1.0 30 does not have
320-360 0.8 30 does not have
320-360 0.6 30 does not have
300 milliliters of example 3, reducing solutions contain total reducing sugar and are 3% molasses containing waste water, and its chromium slag technological process is with example 1.
The result of the test of different temperatures, liquid-solid ratio:
The temperature dreg slurry is solid in the container handles Cr in the slag of back than temperature retention time
+ 6Analysis result
(℃) (minute) (PPm)
180-240 0.8 30 178
260-300 0.8 30 20
320-360 1.0 30 does not have
320-360 0.8 30 does not have
320-360 0.6 30 does not have
Claims (1)
1, the method for water vapour conversion processing chromium slag, this method is mixed with the chromium slag with the waste water or the molasses containing waste water of fermentation glutamate production, and its liquid-solid ratio is 0.6～0.8, behind the stirring slagging slurry, places closed container to heat, and is 0.5～7kg/cm at pressure
2(gauge pressure) is not less than in the superheated steam atmosphere of 320 ℃ of temperature, reduces 30 minutes, slags tap under normal pressure, adds the spent acid neutralization, makes the pH value of slag reach 6～6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 85106006 CN1007134B (en) | 1985-08-07 | 1985-08-07 | Steam method for treating chromium slag |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 85106006 CN1007134B (en) | 1985-08-07 | 1985-08-07 | Steam method for treating chromium slag |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN85106006A CN85106006A (en) | 1987-02-25 |
| CN1007134B true CN1007134B (en) | 1990-03-14 |
Family
ID=4794825
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 85106006 Expired CN1007134B (en) | 1985-08-07 | 1985-08-07 | Steam method for treating chromium slag |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1007134B (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100464910C (en) * | 2007-05-24 | 2009-03-04 | 上海交通大学 | Pyrolytic treatment method for chromium slag |
| CN101168085B (en) * | 2007-11-30 | 2012-05-09 | 河南工业大学 | Chromium slag reduction detoxification technique |
| GB201102465D0 (en) | 2011-02-11 | 2011-03-30 | B & M Longworth Edgworth Ltd | Method of treating waste items |
| CN105524637B (en) * | 2016-01-19 | 2019-10-22 | 青岛理工大学 | Method for preparing energy product by using PVC (polyvinyl chloride) plastics and simultaneously harmlessly treating chromium slag |
-
1985
- 1985-08-07 CN CN 85106006 patent/CN1007134B/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| CN85106006A (en) | 1987-02-25 |
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| C13 | Decision | ||
| GR02 | Examined patent application | ||
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| CF01 | Termination of patent right due to non-payment of annual fee |