CN1393541A

CN1393541A - Process for regenerating used cutting liquid

Info

Publication number: CN1393541A
Application number: CN 01114196
Authority: CN
Inventors: 汪荣丽; 孔繁梅
Original assignee: Individual
Current assignee: Individual
Priority date: 2001-07-02
Filing date: 2001-07-02
Publication date: 2003-01-29

Abstract

A process for regenerating the used cutting liquid includes such steps as measuring its pH value, raising pH value by adding calcium lime, laying aside for 8-12 hr, lowering pH value by adding phosphoric acid while stirring, during stirring, adding alkali solution until its pH value conforms with the standard value, and filtering.

Description

The renovation process of used cutting liquid

The present invention relates to the used cutting liquid regeneration techniques.

Cutting fluid is used rotten foul or too dirty and must scrap can not continue to use again the time, then according to country to environmental protection requirement, it is carried out wastewater treatment to up to standard could the discharging.As everyone knows, finish this thing and will pay great amount of manpower and financial resources.

The purpose of this invention is to provide a kind of renovation process that can make used cutting liquid regenerated used cutting liquid.

The object of the present invention is achieved like this: a kind of renovation process of used cutting liquid, it is characterized in that: the PH initial value of a) at first measuring used cutting liquid, the back is toward the unslaked lime of its interior adding 0.1～10%, make it the pH value and exceed 1～2 than measured said initial value, static at normal temperatures then 8～12 hours, b) add 0.1～10% phosphoric acid again in it while stirring, pH value is rolled back than said initial value again also hang down 0.5～1, c) and then to add concentration in it while stirring be 10～50% alkaline solution, until making pH value reach the standard of the provisions of the relevant regulations issued by the State, d) filter at last transparent liquid, require to adjust according to relative national standards again and do not reach the standard techniques index.

Filter residue can be made chemical fertilizer because of containing a large amount of phosphorus, but a large amount of uses after the calcination when oily when containing.

Also can take after regenerating, directly to mix use more than three times with the new cutting fluid that is up to state standards.

Positively effect of the present invention:

1. the manpower and financial resources that drops into seldom just can realize reclaiming, and it can be used in closed cycle, not only economizes on water but also save medicine.

2. avoided used cutting liquid in discharge process, to give the pollution that environment caused;

3. technology is simple, realization is easy, and regeneration cost is very low and reuse is effective.

Below in conjunction with embodiment the present invention is described in further details

Embodiment 1

Get frowzy, the waste water shape cutting fluid of Dark grey muddiness is quiet puts realization oily water separation, taking off 1 ton of the aqueous humour of layer and recording pH value is 9 to be said PH initial value, then toward its interior 10 kilograms of unslaked lime that add, this moment pH value by 9 be raised to 10 stir the back quiet putting 12 hours, back restir adds 15 kilograms of industrial phosphoric acids and makes pH value roll back 8.5 again, at this moment to add content be that 20% alkaline solution makes pH value rise to 9 again to restir, after-filtration gets 980 kilograms of the aqueous solution of light-coloured transparent, it is antirust defective to detect monolithic according to GB-6144-85 again, adds 2 kilograms of Sodium Nitrites and reaches requirement.Filter residue includes a large amount of phosphorus for 15 kilograms, when phosphate fertilizer is used.

Embodiment 2

Get that cutting and emulsifying wastewater frowzy, that Dark grey is muddy (containing oil in water emulsion 2%) is quiet puts realization oily water separation, taking off 1 ton of the aqueous humour of layer and recording pH value is 8 to be said pH initial value, rise to 9 toward 3 kilograms of unslaked lime pH values of its interior adding, stirred back static 10 hours, after add 3 kilograms of pH values of phosphoric acid again and fall back to 7.5, add content again and be 20% alkaline solution and go back up to 8.5, after-filtration gets 970 kilograms of lurid transparent liquids, add 20 kilograms oil in water emulsion according to the requirement of SY-1374-77 standard, make it to become the emulsus cutting fluid.After filter residue is mixed the coal burning, include a large amount of phosphorus and can do chemical fertilizer usefulness.

Claims

1. the renovation process of a used cutting liquid, it is characterized in that: the PH initial value of a) at first measuring used cutting liquid, the back is toward the unslaked lime of its interior adding 0.1～10%, make it the pH value and exceed 1～2 than measured said initial value, static at normal temperatures then 8～12 hours, b) add 0.1～10% phosphoric acid again in it while stirring, pH value is rolled back than said initial value again also hang down 0.5～1, c) and then to add concentration in it while stirring be 10～50% alkaline solution, until making pH value reach the standard of national defined, d) filter at last transparent liquid, require to adjust according to relative national standards again and do not reach the standard techniques index.