CN101381084B - Harmless disposal method of waste diatomite containing sodium thiocyanate - Google Patents
Harmless disposal method of waste diatomite containing sodium thiocyanate Download PDFInfo
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- CN101381084B CN101381084B CN2008101202679A CN200810120267A CN101381084B CN 101381084 B CN101381084 B CN 101381084B CN 2008101202679 A CN2008101202679 A CN 2008101202679A CN 200810120267 A CN200810120267 A CN 200810120267A CN 101381084 B CN101381084 B CN 101381084B
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- sodium thiocyanate
- waste diatomite
- water
- filtrate
- diatomite
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Abstract
The invention discloses a method for harmless treatment of waste diatomite containing sodium thiocyanate. The method comprises the following steps: mixing a raw material of waste diatomite with water to produce slurry with stirring; spreading the slurry on a filter belt fabric for continuous conveying and at the same time spraying water on the slurry to wash the slurry; keeping the space below the filter belt fabric vacuum and collecting the filtrate sectionally. The amount of water used for treatment is no more than four times of that of the diatomite. The content of sodium thiocyanate in the treated waste diatomite is less than 0.1 percent, and the treated waste diatomite can be reused in the system as a filter aid or used as a building material, a road bed material and so on. Compared with the prior process such as a methanol method, the method of the invention has the advantages of avoiding secondary pollution, and saving investment, transportation cost and water, along with simple and easy-to-implement process, a content of residual sodium thiocyanate less than 0.1 percent, low energy consumption, and suitability to mass production.
Description
Technical field
The present invention relates to a kind of harmless disposal method of waste diatomite containing sodium thiocyanate.
Background technology
Sodium Thiocyanate 99 is colourless deliquescence crystal or white powder, and is poisonous.Diatomite is handled when containing Sodium Thiocyanate 99 solution as sorbent material and flocculating aids, and [Li Zhongmo is to the research of Sodium Thiocyanate 99 production process comprehensive management of environmental protection for Ning Qiushi, Wan Zhiming to contain the Sodium Thiocyanate 99 of different concns in the waste diatomite after the use.The Gansu chemical industry, 2004,2:41-43].In the past,, can only purchase the soil, construct the cement stockyard, air storage owing to can not carry out harmless treatment to this waste diatomite in economical and convenient ground.Wind and weather is stood in the stockyard, and the Sodium Thiocyanate 99 diafiltration of stripping enters water body, and near the water source and the ecosystem are constituted a threat to, and causes environmental pollution, can cause fish kills and person poultry poisoning when serious.
The researchist has proposed some terms of settlement at the processing that contains the Sodium Thiocyanate 99 waste diatomite:
Methanol extraction method [Zhang Wei, the processing of super-cell waste residue in acrylic fiber production process and the research that utilizes again, economic and technical assistance information, 2005,2:43]: at first with waste diatomite airing or oven dry, carry out processed, utilize Sodium Thiocyanate 99 to be soluble in the principle of methyl alcohol, the waste diatomite of oven dry is squeezed into extraction element, extract repeatedly repeatedly, the diatomite with having extracted draws off from extraction element, mass ratio by 1:2-3:0.5-8 adds in the mixing device with water and mixed acid solution, stir, be heated to 80 ℃, mixture send the pressure filter press filtration, to pH=7, the dehydration airing gets work in-process with 60-70 ℃ of hot washes.
Roasting method: waste diatomite is packed in the reverberatory furnace, raise the temperature to 800 ℃ (keeping 2h), remove organism and volatile matter in the raw material soil, and SiO
2Bringing up to comes out of the stove more than 86% gets the diatomite finished product through cooling, pulverizing, selection by winnowing.
The roasting method of fluxing: waste diatomite is added a certain amount of fusing assistant, expanding agent, after mixing by mixer, add in the reverberatory furnace and carry out roasting, burn after pulverize, carry out size classification, can obtain the diatomaceous earth products that different grain size is formed.
The technical process of methanol extraction method is long, and solvent-oil ratio is big, and methyl alcohol is residual to cause secondary pollution easily, and Methanol Recovery needs rectifying and dewatering, the energy consumption height.The Sodium Thiocyanate 99 boiling point is very high, and the roasting method and the roasting method of fluxing can not be decomposed it fully, on the contrary with dischargings such as ash content, flue gases, surrounding environment is caused secondary harm.Owing to complex process, have shortcoming such as secondary pollution, above-mentioned three kinds of treatment processs all do not have the report of practical application at present.
Dynamic percolation process [the Zhang Zhijun of the aqueous solution, Li Dinglong, Yin Wenting, chemical fibre factory's waste diatomite regeneration research, environmental science and technology, 2006,29 (10): 79-80]: adopt the dynamic diafiltration method of the pH=11 aqueous solution to study the relevant desorb rule of major metal ionic and effect adsorbed on the waste diatomite, the diatomite adsorption performance that is obtained is recovered preferably, but does not study the residual condition of Sodium Thiocyanate 99.According to our result of study, this method for washing is reasonable inadequately, because the diatomite particle distribution is very wide, particle is thinner, can produce channel and dead angle during amplification is produced, and the diatomite disposal is incomplete, and local Sodium Thiocyanate 99 is residual serious, and pressure drop is big, the practical application difficulty.
Industrial adoptable other method for washing, as stirring tank repeatedly, equipment takes up an area of big, long flow path, and still will carry out processed at last, and energy consumption is big.
In sum, prior art is handled and is contained Sodium Thiocyanate 99 waste diatomite weak effect, and there is defective in various degree in practical application, is difficult to the requirement that reaches innoxious.Developing new harmless disposal method is a urgent problem.
Summary of the invention
The object of the present invention is to provide a kind of harmless disposal method of waste diatomite containing sodium thiocyanate.
The technical solution adopted for the present invention to solve the technical problems is:
Waste diatomite raw material and water are mixed the formation slurry, then slurry is distributed in thin layer on the belt filter cloth of continuous conveying, the water spray washing, the filter cloth below keeps vacuum, Fractional Collections or centralized collection filtrate; Waste diatomite amount and total water amount weight ratio are 1:1～4, and Sodium Thiocyanate 99 content is lower than 0.1% in the waste diatomite after the processing, and the system of can returning is as the flocculating aids repeated use or as building materials, roadbed material.
The vacuum separation filtrate that described belt filter cloth below keeps 0.02-0.08MPa, filtrate divide the 2-4 section to collect or all be collected in the storage tank.
The mesh aperture scope of described belt filter cloth is 1-12 μ m.
The transfer rate of described continuous conveying is 0.2-5m/min, and can stepless speed regulation.
The described water of using with waste diatomite raw material formation slurry is the low relatively filtrate of final stage Sodium Thiocyanate 99 content in the pure water or the filtrate of Fractional Collections.
The useful effect that the present invention has is:
Compare with existing technology such as methyl alcohol method, there is not the secondary pollution problem in the inventive method, simple for process, investment and running cost is economized, water consumption is few, and the Sodium Thiocyanate 99 residual rate is lower than 0.1%, and energy consumption is low, suitability for industrialized production.The harmlessness disposing that contains Sodium Thiocyanate 99 waste diatomite flocculating aids that produces in the special suitable treatment acrylic fiber production process of the present invention.
Embodiment
Below in conjunction with embodiment the present invention is specified, but be not that the present invention is made restriction.
Embodiment 1:
Get the waste diatomite 5kg that contains 8% Sodium Thiocyanate 99, by solid-to-liquid ratio 1:0.5, add 2.5L water, in the 10L still, stir 5min, total amount is 7.5kg, and transferring to mesh aperture is that 2 μ m belts are filtered on the filter cloth, and the filter cloth transfer rate is 1m/min, the below keeps 0.04MPa vacuum tightness, divide 3 sections suction filtrations, wherein back two sections waters spray, spray water 5L, divide 3 sections to collect filtrate, final stage filtrate 2L collects back still separately and stirs raw material, and waste diatomite is carried terminal discharging at filter cloth, and Sodium Thiocyanate 99 content is 0.07% in the waste diatomite after treatment, realize harmless treatment, the system of can returning is as the flocculating aids repeated use or as building materials, materials such as roadbed.
Embodiment 2:
Get the waste diatomite 100kg that contains 4% Sodium Thiocyanate 99, add 200L water by solid-to-liquid ratio 1:2, in the 500L still, mix 10min, transferring to mesh aperture is that 8 μ m belts are filtered on the filter cloth, the filter cloth transmission speed is 0.2m/min, the below keeps the continuous separating filtrate of 0.03MPa vacuum tightness, the continuous spray washing of filter cloth top water, spray water 100L, divide 4 sections to collect filtrate, final stage filtrate 40L returns mixing kettle to be mixed with the next batch raw material, and waste diatomite is carried terminal discharging at filter cloth, Sodium Thiocyanate 99 content is 0.01% in the waste diatomite after above-mentioned processing, can be back to system.
Embodiment 3:
Get the waste diatomite 100kg that contains 4% Sodium Thiocyanate 99, add 100L water by solid-to-liquid ratio 1:1, in the 500L still, mix 10min, transferring to mesh aperture is that 12 μ m belts are filtered on the filter cloth, the filter cloth transmission speed is 0.4m/min, the below keeps the continuous separating filtrate of 0.06MPa vacuum tightness, the continuous spray washing of filter cloth top water, spray water 100L, divide 3 sections to collect filtrate, final stage filtrate 40L returns mixing kettle to be mixed with the next batch raw material, and waste diatomite is carried terminal discharging at filter cloth, Sodium Thiocyanate 99 content is 0.04% in the waste diatomite after above-mentioned processing, and the system of can returning reuses.
Embodiment 4:
Get the waste diatomite 10kg that contains 8% Sodium Thiocyanate 99, add 30L water by solid-to-liquid ratio 1:3, in the 50L still, mix 10min, transferring to mesh aperture filters on the filter cloth for the 1m belt, the filter cloth transmission speed is 0.2m/min, the below keeps the continuous separating filtrate of 0.03MPa vacuum tightness, the continuous spray washing of filter cloth top water, spray water 10L, centralized collection filtrate, waste diatomite is carried terminal discharging at filter cloth, and Sodium Thiocyanate 99 content is 0.05% in the waste diatomite after above-mentioned processing, and the system of can returning reuses.
Embodiment 5:
Get the waste diatomite 2kg that contains 8% Sodium Thiocyanate 99, add 1L water by solid-to-liquid ratio 1:0.5, in the 5L still, mix 2min, transferring to mesh aperture is that 2 μ m belts are filtered on the filter cloth, continuous filter cloth transmission speed of carrying is 0.2m/min, and the filter cloth below keeps the continuous separating filtrate of 0.03MPa vacuum tightness, filter cloth top 4 sections spray washings of moisture, spray water 1L collects filtrate.Waste diatomite is carried terminal discharging at filter cloth, and Sodium Thiocyanate 99 content is 0.06% in the waste diatomite after above-mentioned processing, and the system of can returning reuses.
Claims (5)
1. harmless disposal method of waste diatomite containing sodium thiocyanate, it is characterized in that: waste diatomite raw material and water are mixed the formation slurry, be distributed in slurry on the belt filter cloth of continuous conveying with thin layer then, the water spray washing, the filter cloth below keeps vacuum, Fractional Collections or centralized collection filtrate; Waste diatomite amount and total water amount weight ratio are 1:1～4, and Sodium Thiocyanate 99 content is lower than 0.1% in the waste diatomite after the processing, and the system of can returning is as the flocculating aids repeated use or as building materials, roadbed material.
2. harmless disposal method of waste diatomite containing sodium thiocyanate according to claim 1 is characterized in that: the vacuum separation filtrate that described belt filter cloth below keeps 0.02-0.08MPa, filtrate divide the 2-4 section to collect or all be collected in the storage tank.
3. harmless disposal method of waste diatomite containing sodium thiocyanate according to claim 1 is characterized in that: the mesh aperture scope of described belt filter cloth is 1-12 μ m.
4. harmless disposal method of waste diatomite containing sodium thiocyanate according to claim 1 is characterized in that: the transfer rate of described continuous conveying is 0.2-5m/min, and can stepless speed regulation.
5. harmless disposal method of waste diatomite containing sodium thiocyanate according to claim 1, it is characterized in that: the described water of using with waste diatomite raw material formation slurry is the low relatively filtrate of final stage Sodium Thiocyanate 99 content in the pure water or the filtrate of Fractional Collections.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008101202679A CN101381084B (en) | 2008-08-15 | 2008-08-15 | Harmless disposal method of waste diatomite containing sodium thiocyanate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008101202679A CN101381084B (en) | 2008-08-15 | 2008-08-15 | Harmless disposal method of waste diatomite containing sodium thiocyanate |
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| Publication Number | Publication Date |
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| CN101381084A CN101381084A (en) | 2009-03-11 |
| CN101381084B true CN101381084B (en) | 2011-01-12 |
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| CN2008101202679A Expired - Fee Related CN101381084B (en) | 2008-08-15 | 2008-08-15 | Harmless disposal method of waste diatomite containing sodium thiocyanate |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| NZ743055A (en) | 2013-03-08 | 2020-03-27 | Xyleco Inc | Equipment protecting enclosures |
| CN110357557B (en) * | 2019-08-31 | 2022-02-08 | 郑州恒博环境科技股份有限公司 | Flame-retardant diatomite wall brick and preparation method thereof |
| CN110386795B (en) * | 2019-08-31 | 2022-02-08 | 郑州恒博环境科技股份有限公司 | Lightweight flame-retardant diatomite brick and preparation method thereof |
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