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A treatment process and grinding technology, applied in sludge treatment, water/sludge/sewage treatment, dehydration/drying/thickened sludge treatment, etc., can solve the problems of large investment in fixed assets, low treatment efficiency, and high operating costs , to achieve the effect of convenient industrial production and easy operation of the treatment process
Pending Publication Date: 2018-08-10
浙江联清环保科技有限公司
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[0034] Among the above processes, the most commonly used treatment processes are incineration and thermochemical washing. The advantages of incineration are high treatment efficiency and low water and oil content in the product. The disadvantage is that there is secondary pollution in the treatment process, and complex waste gas treatment facilities are required. , large investment in fixed assets, high energy consumption, and high operating costs; the advantage of thermochemical washing is that it only needs to be equipped with conventional wastewater treatment facilities, relatively mature environmental protection treatment, low energy consumption, and low operating costs. The disadvantage is that the treatment efficiency is low and the product contains water. The oil content is high, and the treatment site needs to be treated with anti-seepage and anti-leakage treatment
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Embodiment 1
[0084] A treatment process for oil-containing grinding waste sludge, in which the oil-containing grinding waste sludge is sequentially processed through the following processes:
[0085] (1) Screening: add the raw material oil-containing grinding mud to the drum screening machine with a forklift for screening, and the screening particle size is ≦2mm;
[0086] (2) Centrifuge dehydration: the sieved material enters a vertical centrifuge for dehydration, solid-liquid separation, centrifuge rotation speed 300r / min, and the separated waste oil is separated and stored;
[0087] (3) Alkali washing: the solid material after deliquoring by the centrifuge enters the spiral sand washing machine, and performs alkali washing under the action of lye sodium carbonate, wherein the water temperature is 50°C, the solid-to-liquid ratio is 12%, and the lye concentration is 3%. Waste caustic soda is discharged to sewage treatment station;
[0088] (4) Cleaning and pressing filter: the oily grindi...
Embodiment 2
[0092] The difference from Example 1 is that the parameters of the alkali washing process are different, wherein the water temperature is 58° C., the solid-to-liquid ratio is 16%, and the alkali concentration is 4%.
[0093] The moisture content of the final product iron powder after the above process is 22%, and the oil content is 0.5%.
Embodiment 3
[0095] The difference from Example 1 is that the parameters of the alkali washing process are different, wherein the water temperature is 65° C., the solid-to-liquid ratio is 20%, and the alkali concentration is 5%.
[0096] The moisture content of the final product iron powder after the above process is 22%, and the oil content is 0.45%.
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Abstract
The invention discloses an oil-containing grinding sludge treatment process which comprises the following treatment procedures in sequence: (1) screening; (2) removing a liquid by using a centrifuge;(3) performing alkali washing; (4) performing cleaning and filter pressing. By adopting the process, requirements that oil-containing grinding sludge is used as a dangerous waste with utilization values and is subjected to harmless treatment can be met, pollutant emission can be controlled in the production process, the treated oil-containing grinding sludge can meet standards of comprehensive utilization, comprehensive utilization of resources can be achieved, wastes can be turned into wealth, and maximization of economic benefits and social benefits can be met; the process has the advantagesthat (1) the process disclosed by the invention is environmental-friendly; (2) the process disclosed by the invention is economic; (3) the process disclosed by the invention is safe and energy-saving; (4) the process disclosed by the invention is simple and convenient to operate and convenient in industrial production; (5) the grease content of a final product of the process is less than or equalto 0.5%, and the requirements of the national standard Waste Steel on impurity contents can be met.
Description
technical field [0001] The invention relates to the technical field of comprehensive utilization of industrial solid waste, in particular to a process for treating oily grinding waste sludge. Background technique [0002] In the grinding process of bearing processing, a large amount of oily grinding waste sludge will be produced. According to the country's environmental protection regulations, this kind of grinding waste sludge is hazardous waste because it contains waste mineral oil, and hazardous waste is strictly controlled, and random storage, transportation and disposal are not allowed. But the actual situation is that because there is no relevant disposal site, some units and individuals pulled the grinding waste sludge from the waste sludge production unit in the past few years, used it as raw material for ironmaking, and sold it directly to the steel factory. It is illegal to say that, according to the current regulations, the disposal of more than 3 tons of hazardo...
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