FR2895909A1 - USE OF A DELAYED REACTIVITY LIME MILK MILK FOR DISINFECTING OR DEODORIZING - Google Patents

Abstract

The present invention relates to a new use of lime lime for (i) the disinfection and deodorization of industrial or agricultural installations, or (ii) the deodorization of waste, in particular organic waste of plant or household origin, said use being characterized in that use is made of a quicklime with delayed reactivity (CVRR) which is selected from the group consisting of: (A) the premix (CVRRA) of quicklime and super plasticizer, (B ) the partially pre-hydrated quicklime (CVRRB), and (C) their mixtures, the reaction of quicklime, contained in the said CVRR, with the milk water occurring after a lag time of at least 5 minutes, at least 20 minutes, preferably at least 30 minutes and preferably at least 60 minutes from the placing of said CVRR in suspen- sion in milk water, it also relates to said CVRR milk as industrial product, as well as a disinfection and / or deodorization.

Description

2895909 Use of quicklime with delayed reactivity for

disinfect or deodorize

  FIELD OF THE INVENTION The present invention aims to facilitate disinfection or deodorization by means of a quicklime milk, this milk being ob ~ enu by suspending in water a quicklime with delayed reactivity ( abbreviated CVRR), in order to delay the reaction (1) between water and quicklime: 1 o (1) CaO + H2O -> Ca (OH) 2 which is exothermic and usually triggers 2 to 3 minutes after contacting the calcium oxide with water. More specifically, it relates to a new use of a CVRR milk for the disinfection of industrial or agricultural installations, on the one hand, or the deodorization of waste, in particular of plant or animal origin, on the other hand. It also relates to a CVRR milk, as an industrial product, and a method for implementing this dice: nfection or deodorization. PRIOR ART The use of lime as a disinfectant or deodorant is a very old technique still very commonly used especially in agricultural environments. For this purpose, the lime was used (a) either in pulverulent form using quicklime [CaO], or (b) in liquid form by means of slaked lime [Ca (OH) 2 ]. The use of CaO in powder form requires precautions for users and the environment. In view of the exothermic nature of the reaction (1) and the dusts it releases when the water reacts with the lime, the personnel must have protection for the respiratory tract, eyes, skin and clothing, this implies that the personnel must wear respiratory masks, spectacles; and protective suits. In addition, the regularity of the distribution of powdery CaO is limited by the effectiveness of the dispersing means and the accessibility of certain areas by a powder. Subsequent addition of water, or even an aqueous solution of an acid, is necessary to trigger the hydration reaction (1) with the associated temperature rises. However, a controlled dosage of this addition with respect to the powder can not be effected effectively, which leads to a heterogeneous treatment with zones having an excess of water and others having a water deficit, with in both cases a significant loss of thermal effects. At the end of the operation, the treated areas have either an excess of powder and therefore quicklime, or an excess of water or additives. Excess lime can be hazardous, especially when the end of hydration can occur in contact with flammable products. In addition, excess water leads to wet areas that are often undesirable. The use of slaked lime milk with an aqueous suspension of Ca (OH) 2 allows a better regularity in the distribution, and the accessibility of certain zones is facilitated by the use of a liquid. The implementation requires less precautions than that of CaO powder. On the other hand, no thermal effect accompanies the treatment with the milk of slaked lime. On the other hand, given the maximum concentrations obtained for slaked lime milks, the contribution of a determined amount of calcium hydrate requires the addition of a quantity of water at least equal to twice that of calcium hydrate. As a result, the use of a milk of Ca (OH) 2 requires a drying phase subsequent to the application of said milk. It is therefore proposed to provide a new technical solution to overcome the aforementioned drawbacks. Lime milks consisting of aqueous suspensions of CaO overcured are also known. Overcooled CaO, which is prepared or treated at a temperature of 1100.degree.-1250.degree. C., substantially no longer reacts with water and thus does not provide the desired thermal effect of reaction (1) at the desired time. . In practice, the milk CaO overcooked are usable (without being very effective) that in the field; the separation of solids from the liquid of an emulsion. GB 593 648 B discloses the use of partially prehydrated CaO for the production of building blocks ("artificial stones" as described in GB 593 648 B) from a mixed blend (i.e. ) 2895909 15% pre-hydrated CaO by means of steam, (ii) sand and / or clay and (iii) a sufficient amount of water, said mixture being sufficiently fluid to be molded. It is also known from FR 2 841 895 B that the partially prehydrated CaO 5 is used as a binder, a water sensor or a source of energy.This partially prehydrated CaO reacts according to the aforementioned reaction (1). with greater latency or inertia than in the case of conventional lime According to FR 2 841 895 B, which describes the compaction of waste in the form of molded blocks, it is possible to produce a milk of lime with the said lime. CaO partially pre-hydrated, in combination with a filler (which is particularly organic or mineral) and a sufficient amount of water for suspension, for the realization of plaster and coatings to dry surfaces. two previous patents do not describe or suggest the use, in the field of disinfection and / or deodorization of industrial or agricultural installations, of a quicklime made according to the invention by suspending a C VRR [which is as hereinafter described a CVRRA (premix of quicklime and superplasticizer) or a CVRRB (quicklime partially pre-hydrated)].

  In addition, their teaching does not suggest that hydrates of lime, obtained in fine form powder, are, unlike plaster and adherent coatings of the prior art, removable by simple sweeping or brushing. OBJECT OF THE INVENTION According to the invention, it is proposed to provide a quicklime milk which is sufficiently fluid to be distributed, distributed or projected onto surfaces to be treated and such that the reaction (1) mentioned above is triggered for at least 5 minutes. , in particular at least 20 minutes, preferably at least 30 minutes and better still at least 60 minutes after contacting (with CaO 3 0 with H 2 O. The aim is to overcome the aforementioned drawbacks that the prior art by implementing a milk consisting of an aqueous suspension of CVRR, in particular a CVRRB (quicklime partially prehydrated) obtained according to the teaching of patent FR 2841895 B, said CVRR being applied, in the form of an aqueous suspension on the surfaces of the installations to Before the initiation of the above-mentioned hydration reaction (1), the subject of the invention is to be used According to a first aspect of the invention, it is recommended to use a quicklime milk for the disinfection and / or the deionization. soclisation said use being characterized in that one uses a quicklime with delayed reactivity (CVRR) which is selected from the group consisting of: (A) the premix (here referred CVRRA) of quicklime and dl; super-1 plasticizer, (B) partially pre-hydrated quicklime (referred to herein as CVRRB), and (C) their mixtures, the reaction of quicklime, contained in said CVRR, with the water of the milk occurring after a latency period of at least 5 minutes, especially at least 20 minutes, preferably at least 30 minutes and preferably at least 60 minutes after the suspension of said CVRR in the water of the milk,

  to: (i) disinfect and deodorize industrial or agricultural facilities, or (ii) deodorize wastes, including wastes of plant or household origin. According to a second aspect of the invention, it is recommended an aqueous lime milk, usable in the field of (i) the disinfection and deodorization of industrial or agricultural installations, or (ii) the deodorization of waste, in particular waste of vegetable or household origin, said milk being characterized in that it contains 10 to 80% w / w of CVRR chosen from the group consisting of (A) CVRRA, (B) CVRRB, and (C) ) their mixtures. Of course, the hydration reaction of quicklime, contained in said aqueous milk, occurs, as indicated above, after a latency period of at least 5 minutes, in particular of at least 20 minutes, of preferably at least 30 minutes and preferably at least 60 minutes from suspending said CVRR in the milk water. According to a third aspect of the invention, a method is advocated for the disinfection and deodorization of industrial or agricultural installations using quicklime, said method being characterized in that it is applied to the surfaces to be treated a milk containing 10 to 80% w / w of CVRR selected from the group consisting of

(A) CVRRA,

(B) CVRRB, and

(C) their mixtures,

  in a proportion of 10 to 1000 liters of said milk per 100 m2 of surface to be treated, preferably 30 to 100 liters of said milk per 100 m2 of surface to be treated.

  Of course, during the implementation of this method of disinfection and deodorization of industrial or agricultural installations, the hydration reaction of quicklime, contained in said aqueous milk, occurs, as indicated above, after a period of time. at least 5 minutes, especially at least 20 minutes, preferably at least 30 minutes and preferably at least 60 minutes from the suspension of said CVRR in milk water.

  According to another aspect of the invention, there is provided a method for deodorizing the waste, in particular waste of plant or household origin, said method being characterized in that it comprises the treatment of the waste by means of a milk of quicklime containing 10 to 80% w / w of CVRR selected from the group consisting of:

(A) CVRRA,

(B) CVRRB, and (C) their mixtures,

  100 to 400 liters of said milk per 1 m3 of waste tra tra .ter, preferably 80 to 120 liters of said milk per 1 m3 of waste to be treated.

  Of course, during the implementation of this waste deodorization process, the hydration reaction of the quicklime, contained in the said aqueous milk, occurs, as indicated above, after a period of latency of 30 minutes. at least 5 minutes, especially at least 20 minutes, preferably at least 30 minutes and preferably at least 60 minutes from the suspension of said CVRR in the milk water. Finally, in the CVRRB, the predominantly weighted elements are CaO and Ca (OH) 2, with regard to the choice of quicklime starting (calcium lime, magnesium lime or lime containing at least one other alkaline earth metal oxide). ). In practice, a CVRRB consisting mainly of partially prehydrated CaO will be used containing: (a) 40 to 98 wt% CaO, and (b) 60 to 2 wt% Ca (OH) 2, based on total weight of CaO and Ca (OH) 2 in said CVRRB, and advantageously: (a) 88 to 92% by weight of CaO, and (b) 12 to 8% by weight of Ca (OH) 2, based on the total weight of CaO and Ca (OH) 2 in said CVRRB. DETAILED DESCRIPTION OF THE INVENTION When it comes to particle size, by the relationships (a) and (b): (a) dx y (in m), and (b) v (in m) of the w (in m ) here, according to (a), the fact that x% by weight of the particles concerned have a size of less than or equal to ym, and according to (b) the fact that u% by weight of the particles concerned have a size which is greater than or equal to equal to 25 vm and which is less than or equal to w m. The CVRR according to the invention, obtained by premixing quicklime and superplasticizer (CVRRA) or by partial pre-hydration of quicklime (CVRRB), has a particle size of less than or equal to 2 mm, preferably an average particle size such as m 700 m and better a particle size such as 20 m d50 200 m This C`IRR is then mixed in a tank, with stirring, with water to obtain the desired concentration. The resulting suspension is hereinafter referred to as "CVRR milk". "Superplasticizer" is a term of the art to refer to any substance, plasticizer or even dispersant, having effects on viscosity, concentration and dispersion of milk. The currently commercialized superplasticizers are essentially polymeric surfactants (i) of the type having sulfonic acid or sulfonate groups on their linear backbone, or (ii) of the type having carboxylic acid or carboxylate groups. Among the sulphonated products of the first type, mention may be made in particular of sulphonated melamine-formaldehyde polymers, sulphonated naphthalene-formaldehyde polymers and modified lignosulfates; among the products of the second type, polycarboxylate derivatives, in particular those having a polyacrylate or polymethacrylate structure, may also be mentioned. Also suitable as a superplasticizer, the product marketed by CHRYSO under the "CHRYSO Fluid Optima 175" nomenclature, which is based on polycarboxylates and contains phosphonate groups. The superplasticizer can be used in powder form or in powder form; liquid form; however, advantageously, a liquid superplastic is used. In order to prepare the CVRRA according to the invention, the quicklime is mixed with the superplasticizer with stirring, the latter preferably being in liquid form as indicated above. Then, the product resulting from this operation is dispersed in water to obtain the CVRRA milk. The duration of latency that the CVRRA presents during the hydration reaction is apparently due to the formation of a coating of the quicklime particles by a superplasticizer shell or layer retarding the attack of the quicklime by milk water. In practice, for the production of CVRRA, 0.5 to 15 kg of superplasticizer per 100 kg of milk will be used. Quicklime, used for the preparation of the CVRR according to the invention, namely CVRRA, CVRRB and mixtures thereof, may be a calcium lime (consisting of CaO) or a lime containing at least one oxide of another alkaline earth metal, for example a magnesium lime (generally containing from 5 to 34% by weight of MgO) or a dolomitic lime (generally containing 34 to 43% by weight of MgO). In view of all the lime that can be used to formulate the CVRR of the invention, it is clear that in CVRRA CaO is the weighted element over all other alkaline earth metal oxides susceptible to oxidation. be present in the starting lime and that, in the CVRRB, the CaO + Ca (OH) 2 group is weighted predominantly over any other alkaline earth metal oxide + hydrate group capable of being present in the lime of departure. In the CVRRB according to the invention, which is obtained by partial hycation (ie action of H2O on an excess of CaO with respect to the stoichiometric conditions), any other alkaline earth metal oxide present is partially pre-hydrated, such as CaO, for example, according to the following exothermic reaction (2) relating to the MgO of a magnesium lime: (2) MgO + H2O - Mg (OH) 2 The CVRRBs obtained from non-calcium lime, containing for example CaO and MgO, will comprise mixed with CaO and Ca (OH), on the one hand, and MgO and Mg (OH) 2, on the other hand. Advantageously, the magnesium lime that can be used according to the invention to obtain the CVRRA and CVRRB will have an initial MgO content of less than or equal to 20% w / w. In practice, when the CVRRB is obtained from CaO and one or more alkaline earth metal oxides, the total content of alkaline earth metal oxide (s) will be less than or equal to 20% w / w in order to to preserve the desired thermal effect and the homogeneity of the mixture of oxides and hydrates of the partially pre-hydrated lime. Unless otherwise indicated, the CVRR intervening here will be mainly obtained from a calcium lime, the other lime, such as magnesium lime, acting in a similar manner. The CVRRB of calcium origin is in the form of a mixture of CaO quicklime particles and Ca (OH) 2 extinct lime particles, arranged in such a way that, in the presence of water, the reaction (1) above mentioned is delayed. In the present state of knowledge, it is reasonable to assume that the CVRRB is in the form of CaO lime particles constituting a core and Ca (OH) 2 slaked lime particles constituting a layer or temporarily protective film encapsulating the CaO core. Even though this is a theory that does not bind the Applicant, the "CaO core encased in a temporarily protective Ca (OH) 2 membrane or layer" representation is handy for understanding the delay mechanism. of the reaction (1). The lime retarded by partial pre-hydration, which is used according to the invention, will be composed of 40 to 98% by weight of calcium oxide and 60 to 2% by weight of calcium hydroxide, relative to sum of the CaO and Ca (OH) 2 weights present in the CVRRB. Advantageously, the CaO content will be from 88 to 92% by weight and such as calcium hydroxide from 12 to 8%, relative to the weight of the sum of CaO + Ca (OH) 2 in the CVRRB. The CVRR milk is liquid and therefore has all the facilities for application and accessibility for difficult areas, unlike a powder. The CVRR milk can be prepared with concentrations (up to 70-80% by weight relative to the weight of the milk) much higher than those obtained for hydrate lime milks, and with a minimum of water corresponding to the amount needed to hydrate lime contained in the CVRR. The characteristic reactivity curve of the lime delayed by pre-hydration leads to a rapid and total reaction from the trigger and is particularly adapted to the needs. Under these conditions, the thermal effect obtained is optimal, the reactions are total and homogeneous, no residue of water or quicklime can essentially remain at the end of the treatment. Prior to the introduction of the CVRR into water, one or more additives may be added to the CVRR, water or both, to adjust or adapt CVRR's milk for The intended use, in particular with regard to: the viscosity, depending on the distribution equipment or projection used to apply the quicklime milk, the concentration of the milk, as a function of the quantity of residual water; desired after the hydration reaction, the CVRR milk hydration lag, as a function of the time available between the preparation of the quicklime milk and its application prior to the hydration reaction. It is possible to add a superplasticizer in the water before introducing the CVRRB into the resulting aqueous medium. In this case, said superplasticizer will also be advantageously used at a rate of 0.5 to 15 kg of superplasticizer per 100 kg of milk.

  According to a preferred embodiment of the invention, it is recommended to incorporate a solid superplasticizer or (preferably) liquid in the CVRR milk. This incorporation is carried out:

  (a) adding said superplasticizer to the water before adding lime, or

  (b) adding said plasticizer to the lime prior to suspending in water; the operating procedures (a) and (b) both apply to obtaining the CVRRB milk [(a) being the preferred method in this case], and the operating method (a) is applies to obtaining CVRRA and CVRRA milk as explained above.

  The CVRR milk prepared as described above is used in liquid form before the start of the hydration reaction. This implementation can be done either manually or by means of distribution devices, including sprayers or projection devices compatible with the grain size of the CVRR.

  The hydration reaction is triggered in the CVRR milk after its distribution or distribution on the surface to be treated or in the waste to be treated, with the consequence, on the one hand, the consumption of all or part of the water contained in CVRR milk, on the other hand, a local temperature rise of up to 150 C or more.

  In practice for disinfection and deodorization, industrial or agricultural installations, it is appropriate to have a temperature of at least 50 C, and preferably at least 90 C, on the surfaces to be treated. In practice also, for the deodorization of waste especially of plant or household origin, it is necessary to obtain within said waste a temperature of at least 50 C.

  The CVRR milk, at the end of the hydration reaction, gives hydrates [essentially Ca (OH) 2 in the case of a CVRR obtained from calcium lime], either in the form of a powder with (i ) optionally a residual content of free CaO if the quantity of water available in the quicklime milk is less than that resulting from the hydration of the pre-hydrated lime, or (ii) possibly with a residual water content on the other hand.

  In practice, it is preferred to avoid, as far as possible, the presence of residual CaO in the hydrates formed by the CVRR of the milk, it is sufficient to adjust the concentration of CVRR suspended in said milk. It will be preferred that the hydrates formed have a low residual water content. However, for the hydrates obtained to be removable by sweeping or brushing, it is recommended that their residual water content in the dry state be less than or equal to 8% w / w. This moisture content in the dry state of 8% w / w seems, in the present state of knowledge, to constitute a threshold below which said solid hydrates formed during hydration do not adhere substantially to the surfaces.

  1 o treated (coating vertical surfaces, they are detached even in the majority in the dry state by gravity), it is then sufficient to brush or brush slightly said surfaces to remove hydrates remaining on said surfaces; and beyond which said pasty or viscous hydrates formed remain mainly bonded to the treated surfaces.

  With a milk having a preferred CVRRB content of calcium origin [ie CVRRB containing 88 to 92% by weight of CaO and 12 to 8% by weight of Ca (OH) 2, and having an average particle size as referred to above (20 μm) of between 10 and 80% by weight relative to the weight of CVRRB milk, there is generally:

  • a temperature reached by CVRRB milk and surfaces

  directly in contact with it, which is between 90 and 200 C, in the case of a residual CaO content, and from 51 to 100

   C, in the case of a residual water content of less than or equal to

25 to 8% w / w; and

  • Easy removal by sweeping or brushing the solid calcium hydroxide formed.

  On the other hand, when the residual water content is greater than 8% w / w, a more or less viscous paste is obtained on the treated surfaces.

  As a function of said residual water content, and removal by sweeping or brushing of the pasty / viscous calcium hydrate formed becomes delicate.

  CVRR's milk is particularly effective for disinfecting and deodorizing industrial or agricultural facilities, including 35 stables, sheepfolds, barns, pigsty and hen houses, and even hutches.

  It is also suitable for deodorizing organic waste, in particular of plant origin and even food or household waste. The products thus deodorized may be subsequently treated, in particular by grinding; to be spread on fields.

  As indicated above, the reaction of quicklime, contained in CVRR, with the milk water occurs after a latency period of at least 5 minutes, in particular of at least 20 minutes, preferably at least 30 minutes. minutes and preferably at least 60 minutes from the suspension of said CVRR in the milk water. If a latency period of 5-10 minutes is required, it is recommended to provide a device that includes (1) continuous mixing of the CVRR with water to obtain CVRR milk and (2) distribution or continuous projection of CVRR milk thus obtained. If necessary, such a device may also comprise, upstream of the mixing tank of the CVRR with water, a continuous supply but distinct from CVRR, on the one hand, and water, on the other hand.

  When the latency time is 20 minutes or more, a device operating continuously as referred to above is no longer necessary.

  Other advantages and features of the invention will be better understood on reading the following examples of embodiments. Of course, all of these elements is not limiting but is provided by way of illustration.

  EXAMPLE 1 A CVRRB milk is prepared by:

  mixing, with stirring, in a tank of 300 liters of water and 12 kg of liquid superplasticizer of the "CHRYSO Fluid Optima 175" type for 3 minutes, then

  addition, with stirring, of 600 kg of calcium lime partially pre-hydrated [i. e. CVRRB containing 88 to 92% by weight of CaO and 12 to 8% by weight of Ca (OH) 2], and having a particle size of less than or equal to 2 mm and a mean particle size such as 50 μm <150 μm.

  The quick lime milk thus formulated has a delay in hydration of 100 minutes.

  This whitewash is sprayed on the floor of a hen house by means of a plasterer at a rate of 70 liters per 100 m2 of surface to be treated to obtain a uniform whitish color at ground level. This operation will be advantageously completed at most 60 minutes after the start of the CVRRB milk preparation.

  The hydration reaction is initiated 100 minutes after the beginning of the preparation of said milk. For 100 kg of quicklime, the hydration reaction consumes about 21 liters of water and the evaporation of water is about 4 liters of water for a lower residual water content. at 8% w / w. At the end of the hydration reaction according to reaction (1), the CVRRB milk, converted into calcium hydrate, has the appearance of a slightly moist powder. The pH of the soil is greater than 12. The maximum temperature on the henhouse surface is 95 C. The said calcium hydrate obtained is removed by sweeping.

  Example 2 According to the method of Example 1, a quicklime is prepared from 300 liters of water, 20 kg of liquid superplasticizer and 70) kg of calcium lime partially pre-hydrated [i. e. CVRRB containing 88 to 92% by weight of CaO and 12 to 8% by weight of Ca (OH) 2, having a particle size of less than or equal to 2 mm and having a particle size distribution

  Average such as 50 micrometers 150 m].

  Applied to the floor of a chicken coop as shown in Example 1, the CVRRB milk thus obtained reacts 140 minutes after the start of the contacting of the water with the CVRRB to turn into calcium hydrate. The resulting calcium hydrate has the appearance of a powder; dried.

  The residual humidity is less than 0.5% by weight and the maximum temperature recorded on the ground is 120 C.

  EXAMPLE 3 The CVRRB milk, prepared according to the method of Example 2, is sprayed on stable walls to be disinfected at the rate of a maximum of

  100 liters of said milk per 100 m2 of surface to be treated. A regular white color surface is obtained. The viscosity is sufficient to prevent product flow along the walls. During the hydration reaction, quicklime is transformed into a dry powder that naturally breaks off the walls for the most part; residues

  Powder remaining on said walls can be removed by simple brushing. The maximum temperature recorded on the walls is 110 C. Example 4

  A CVRRB milk, obtained according to the method of Example 1 is pumped over a cluster of plant and household detritus requiring deodorizing treatment. CVRRB milk has a sufficiently low viscosity to penetrate deeply. The treatment is maintained until a complete recovery is obtained, which translates into a consumption of the order of 100 liters of milk per 1 m3 of treated waste. The hydration reaction results in a noticeable heating by the water vapor emanating from the assembly, which supposes a temperature higher than 90 C. After 24 hours, the rise of temperature is no longer perceptible on the surface and the release of unwanted odors eliminated.

Examples 4 and 5

  Prepared according to the method of Example 1,

  (a) a CVRRB of magnesium origin [CVRRB containing 88 to 92% by weight of CaO and 12 to 8% by weight of Ca (OH) 2 and having a content of MgO + Mg (OH) 2 (expressed as equivalent in MgO) of 15%

  By weight, each of these weight percentages being given with respect to the weight of the CaO + Ca (OH) 2 sum of said CVRRB], and

  (b) a CVRRB of magnesium origin [CVRRB containing 88 to 92% by weight of CaO and 12 to 8% by weight of Ca (OH) 2 and having a content of MgO + Mg (OH) 2 (expressed as equivalent in MgO) of 10%

  By weight, each of these weight percentages being given with respect to the weight of the sum CaO + Ca (OH) 2 of said CVRRB, these two CVRRB having a particle size less than or equal to 2 mm and an average particle size such as 50 m 5 150 m.

  The deodorization of a pile of detritus is then carried out

  Of vegetable and household origin, with each of these two CVRRs, according to the method of Example 4.

  EXAMPLE 6 A CVRRA is prepared by mixing, with stirring, in a first tank, 500 kg of calcium lime and 30 kg of liquid superplasticizer of the "CHRYSO Fluid Optima 175" type for 5 minutes. The resulting mixture of average particle size of 60 m <dd 175 m, with stirring, is introduced into a second tank containing 400 liters; of water. A CVRRA milk is obtained in which the CaO reacts with the milk water with a latency of 30 minutes. This CVRRA milk can be used for the disinfection of agricultural plant surfaces. 16

Claims (10)

  1. Use of quicklime milk for disinfection and / or deodorization, said use being characterized in that use is made of quicklime with delayed reactivity (CVRR) which is selected from the group consisting of (A) the premix (CVRRA) of quicklime and superplasticizer, (B) the partially pre-hydrated quicklime (CVRRB), and (C) their mixtures, the reaction of quicklime, contained in said CVRR, with the milk water intervening after a latency period of at least 5 minutes, in particular of at least 20 minutes, preferably of at least 30 minutes and better still of at least 60 minutes after the suspension is suspended of said CVRR in the milk water, for: (i) disinfecting and deodorizing industrial or agricultural installations, or (ii) deodorizing the waste, in particular waste of plant or household origin.   2. Use according to claim 1, characterized in that said CVRR is a calcium lime or lime containing at least one oxide of another alkaline earth metal, and said CVRRB consists mainly of partially prehydrated CaO containing: (a) 40 to 98% by weight of CaO, and (b) 60 to 2% by weight of Ca (OH) 2, based on the total weight of CaO and Ca (OH) 2 of said CVRRB, and better by partially prehydrated CaO containing: (a) 88 to 92 wt.% CaO, and (b) 12 to 8 wt.% Ca (OH) 2 based on the total weight of CaO and Ca (OH) 2 of said CVRRB.   3. Use according to any one of claims 1 and 2, characterized in that said CVRR has a smaller particle size or 2 mm and an average particle size such as 50 m 150 m 150   4. Aqueous quicklime milk for use according to any one of claims 1 to 3, in the field of (i) disinfection and deodorization of industrial or agricultural installations, or (ii) the deodorization of waste, in particular waste of plant or household origin, said milk being characterized in that it contains 10 to 80% w / w of CVRR 10 selected from the group consisting of (A) CVRRA, (B) CVRRB, and (C) their mixtures .   5. Quicklime milk according to claim 4, characterized in that said CVRRB consists essentially of partially prehydrated CaO containing: (a) 88 to 92% by weight of CaO, and (b) 12 to 8% by weight of Ca (OH) 2, relative to the total weight of CaO and Ca (OH) 2 of said CVRRB. 20   6. Quicklime milk according to any one of claims 4 and 5, characterized in that said CVRR (i) is calcium lime or lime containing at least one oxide of another alkaline earth metal, and (ii) ) has a particle size less than or equal to 2 mm, in particular an average particle size such as 50 m S d50 150 m. 25   7. Quicklime milk according to any one of claims 4 to 6, characterized in that it provides a temperature of at least 50 C, and preferably at least 90 C, on the surfaces to be treated.   8. Quicklime milk according to any one of claims 4 to 7, characterized in that the quicklime it contains is a CVRRB and in that it further comprises a superplasticizer.   9. Process for the disinfection and deodorization of industrial or agricultural plants using a quicklime milk according to any one of claims 4 to 8, said method being characterized in that it is applied to the surfaces to be treated a milk containing 10 to 80% w / w of CVRR selected from the group consisting of 18 2895909 (A) CVRRA, (B) CVRRB, and (C) their mixtures, in a proportion of 10 to 1000 liters of said milk per 100 m2 surface area to be treated, preferably 30 to 100 liters of said milk per 100 m2 of surface to be treated.   10. A process for deodorizing waste, in particular waste of plant or household origin, said method being characterized in that it comprises the treatment of waste with a quicklime according to any one of claims 4 to 8 containing 10 to 80% plp 10 CVRR selected from the group consisting of: (A) CVRRA, (B) CVRRB, and (C) their mixtures, from 100 to 400 liters of said milk per 1 m3 of waste to to treat, preferably 80 to 120 liters of said milk per 1 m3 of waste to be treated.