CN1125248A

CN1125248A - Waste anti-freeze fluid regenerating method

Info

Publication number: CN1125248A
Application number: CN 95114044
Authority: CN
Inventors: 汪荣丽; 孔繁梅
Original assignee: Individual
Current assignee: Individual
Priority date: 1995-12-27
Filing date: 1995-12-27
Publication date: 1996-06-26
Anticipated expiration: 2015-12-27
Also published as: CN1085717C

Abstract

The regeneration method of discarded anti-freeze fluid includes the following steps: classification of discarded anti-freeze fluid according to the color; determination of all item values about metal corrosivity and pH value; addition of coagulant to make precipitation to remove impurities; addition of rust preventer to regulate quality; secondary determination of pH value and corrosivity to meet standards; supplementing anti-freeze fluid and dye, and filtering; taking out filtrate and detecting freezing point according to ministrial standard; supplementing foam inhibiting agent to obtain the finished product; standing still for 15 days and packing. Said regenerated anti freeze fluid can be reused, and has the functions of anticorrosion, rust-preventing and antiscale, etc..

Description

The renovation process of waste anti-freeze fluid

The present invention relates to a kind of depleted deicing fluid regenerated method that makes, be used for internal-combustion engine cooling system, radiator particularly, the recovery of waste anti-freeze fluid, renewal, continuation are used.And also have anticorrosion, antirust, antiscale, an anti-function of boiling.

Past deicing fluid in use because the hurried variation of temperature and constantly flowing; The katalysis of normal phase ingress of air and multiple metal, make the continuous oxidation of its effective ingredient and go bad, the also hurried decline of pH value, these factors impel deicing fluid to increase the weight of corrosion of metal, corrosion products etc. roll up in solution, these a large amount of corrosion products impel these variations to add rapid formation vicious cycle again, the deicing fluid that has only uses some months, when discharging spring, be that denseness increases mostly, color goes down, and the corrosion thing increases, become muddy especially, this is the result serious to the metallic corrosion of water tank.Cause deicing fluid can not continue to use, the water tank life-span also reduces greatly again.A large amount of dischargings of deicing fluid are the wastes of a huge resource, and the multiple metal ion that is corroded, and for example its concentration such as copper surpasses the discharging standards of electroplating industry regulation, hundreds of times even pick up ten thousand times more than.After deicing fluid uses a winter, major part is thrown in the environment during spring, cause environmental pollution, only just have more than the various automobile hundreds of thousands of the Daliang City through rough estimates, the annual deicing fluid that consumes is more than several thousand ton, and annual anxious huge the increasing of automobile, the annual fund that for this reason consumes deicing fluid also has several more than 10,000,000 yuan, if from a province and even the whole nation, this capital amount is just quite huge, waste anti-freeze fluid contains toxic frostproofer---the ethylene glycol of high density, data according to the Ministry of Chemical Industry's Office for Scientific and Technical Information shows: ethylene glycol is poisonous, showing has restraining effect to central nervous system, kidney there is infringement, cause the uriniferous tubules crystallization to block, mucous membrane there is stimulation, to the heart, liver, lung all has certain infringement, long-term contact can cause that eye irritates symptom, ocular ataxy, appetite stimulator, drowsiness, in a certain state of delirium and chronic kidney damage repeatedly shows effect, should prevent to wrongly take and suck ethylene glycol steam, the ethylene glycol vapour pressure is that 0.06mm mercury column (20 ℃) is that the useless deicing fluid that chronic evaporation is discharged is everywhere lived in the environment of ethylene glycol steam people for a long time, is difficult to avoid the generation of above-mentioned situation.Along with industrial and agricultural development, motor vehicle everyday increases, and deicing fluid discharging is wide, amount is big, is hundred million very important, should take measures, protect environment.Reduce and pollute, saving fund, the social benefit that promotes stop useless deicing fluid at will to discharge recyclable regeneration.

The purpose of this invention is to provide a kind of waste anti-freeze fluid regenerated method that makes, avoid environmental pollution, the saving fund increases social benefit.

The object of the invention can realize by following technical proposals: the present invention is raw material, at first is by the close classification of color with waste anti-freeze fluid with depleted deicing fluid; Be about to pink to large red be the I class; With green to blue look is the II class, with colourless be the III class, this is that the color of looking ahead does not mix, guarantee aesthetic appearance, then arbitrary class is measured corrosion of metal and pH value, surveying corrodibility is in order to determine to add the kind and the quantity of rust-preventive agent, surveying pH value is in order to determine to add the quantity of flocculation agent, the basic cpd such as the calcium hydroxide that belong to alkaline-earth metal have just been added then, oxyhydroxide such as magnesium hydroxide, generate water-fast compound with the acid organism effect in the waste anti-freeze fluid, the cohesion contamination precipitation, and then survey pH value, if pH value rising one-level just illustrates that the flocculation agent of the oxyhydroxide that adds is excessive, at this moment just need add the non-corrosive acid that can precipitate alkaline-earth metal ions, its add-on can make pH value get back to initial value, add non-corrosive basic cpd then, as: sodium hydroxide, yellow soda ash, any or several mixing such as sodium phosphate, also to add rust-preventive agent: as Sodium Nitrite, Sodium Tetraborate, benzotriazole, Sodium Benzoate etc. a kind of or several, the size of add-on or kind are determined according to beginning to survey corrosive result, the result who adds to make pH value to 9 corrosions of metal all qualified till, Here it is so-called the adjustment.Qualified back restock frostproofer, it is a kind of that its kind has ethylene glycol, Diethylene Glycol, glycerine etc. generally to add, and also will add dyestuff, filters then.In filtrate, add appropriate amount of defoamer till qualified.Quietly put about about 15 days,, at last filtrate is analyzed by ministerial standard (SH0521-92), be measured to the qualified finished product that is, the packing warehouse-in so that react completely to steady quality.Left filter residue, water clean, its pure slag mix coal burn or mix bake bricks watt with, filtrate being used for after it is washed made the saturated solution of various additives with the usefulness that adjusts.

The present invention compared with prior art since present method make the waste anti-freeze fluid that can not continue to use over and needn't still fall again, can become qualified deicing fluid fully continues to use, stop the deicing fluid of a large amount of dischargings, just avoided environmental pollution, so just reduce and consume, save fund, produced huge social benefit and economic benefit.

Specifically describe embodiments of the invention below in conjunction with processing sequence:

Embodiment 1

The few waste anti-freeze fluid of 1 ton of blackish green turbidity sediment thing require to be processed into-35 ℃ of qualified deicing fluid (glycol concentration is 46.5%) survey pH value be 7 and metal protection all defective, at first constantly add calcium hydroxide (each 50 grams) and stirring in a small amount, when color deepens suddenly, pH value stopped by 8 o'clock.Adding phosphoric acid (each 10 milliliters) more gradually makes pH value drop to 7 again to stop.(making the calcium metal ion precipitation), using the saturated solution adjustment of 1: 1 yellow soda ash and sodium phosphate to make pH value reach 9 afterwards, to analyze every corrosion more qualified entirely, to check in ethylene glycol content with this on ethylene glycol content and condensation point relation curve be that 42.5% requirement is 46.5% with-35 ℃ of ethylene glycol content for-29 ℃ to survey condensation point again, then according to 1050 kilograms of gross weights, should replenish (99.99%) 42 kilogram of ethylene glycol, afterwards the restock green colouring material filter distinct green transparent liquid.Add quiet again its reaction mass of 15 angels of putting of defoamer 0.005% again and reach stable, by the ministerial standard analysis, qualified is the finished product packing.Filtering slag water is cleaned the saturated solution that washing lotion is used for the making various additives usefulness that adjusts.The pure slag that washes out soluble components is mixed coal.Heating is burnt.

Embodiment 2

One ton of sorrel muddiness, a lot of waste anti-freeze fluid of throw out requires to be processed into-45 ℃ of qualified deicing fluid (glycol concentration is 51.5%), and at first surveying pH value is 8 and all defective to various corrosions of metal.At first constantly a small amount of calcium hydroxide (each 50 grams) that adds also stirs, and stops when pH value rises to 9.Adding phosphoric acid more gradually makes pH value drop to 8 again for each 10 milliliters.Adding then with 1: 1 the yellow soda ash and the mixed solution saturated solution of sodium phosphate makes pH value reach 9, analyze every metal protection and still have iron this moment, copper is defective, add benzotriazole 0.05% again, trolamine 0.5%, analyze again and reach standard-required, according to total amount replenish filter after 73 kilograms of ethylene glycol and the suitable orchil red distinct transparent liquid and then add 0.005% defoamer by SH0521-92 standard analysis metal protection, but iron few poor replenished not only Sodium Nitrite 0.05% survey qualified quiet be put into after the 5th day pH value drop to 8.5 but also with 20% sodium hydroxide be transferred to 9 quiet be put into 15 days still qualified be finished product packing.

Filter residue washes with water, and the saturated solution that washing lotion is manufactured additive be equipped with to be adjusted and to be used it.Pure slag is mixed to bake bricks and is used up.

This method can realize the closed cycle that deicing fluid uses after reclaiming old deicing fluid, even filter residue also can be free from environmental pollution, all can be discharged to useful use, if can take required measure in administrative control, with even more ideal.

Claims

1, a kind of waste anti-freeze fluid regenerating method, it is characterized in that: with waste anti-freeze fluid is raw material, by the close classification of its color, pink to bright red be the I class, green extremely blue look is the II class, colourless is the III class, at normal temperatures, survey corrodibility and pH value respectively, the basic cpd that adds alkaline-earth metal, cohesion impurity, survey pH value and rise 1 grade approximately, add the non-corrosive acid that can precipitate alkaline-earth metal ions then, precipitate excessive alkaline-earth metal ions, add non-corrosive basic cpd then and the rust-preventive agent adjustment makes PH to 9, after corrodibility reaches standard-required, add frostproofer, dyestuff, filter the back restock and add defoamer, quiet putting detected filtrate and reached till the ministerial standard about 15 days.

2, by the method for claim 1, it is characterized in that surveying pH value rising one-level and indicate the basic cpd that adds enough, prepare next step and add acid adjustment.