SU804570A1 - Raw mixture for producing calciumalumochromophosphate binder - Google Patents

Description

 . ....

The invention relates to the production of binders used in the manufacture of anti-corrosion, as well as cement and concrete for various purposes, including for the manufacture of heat-resistant anti-corrosion coating.

Compositions are known, including orthophosphoric acid, compounds of the corresponding methane and a reducing agent (for example, formalin, which is introduced into the raw mix to reduce part of the hexavalent chromium compound to the trivalent state l.

Closest to the offer is raw material for the manufacture of a phosphate binder, consisting of orthophosphoic acid, chromic anhydride, aluminum hydroxide, calcium hydroxide formalin in the following correlation of components, wt.%:

Orthophosphorus

acid.

(100% H3P04) 46-57

Chromic anhydride. 25-29 Aluminum hydroxide 5-8 Calcium hydroxide 5-7

Formalin 4-10

WaterEverything,

The known raw material mixture provides for obtaining halychiumalg4O-chromophosphate dispenser for applying phosphate coatings, which are highly resistant to water, at lower processing temperatures of 2.

0

 However, the presence of formalin in this raw mixture leads to the fact that when a binder is produced from this mixture, the required ratio of hexavalent and Tt) of equivalent chromium (SKyOg CfOy) in it should be in the range of 0.37-0.41, formed in as a result of the reduction of part of chromic anhydride with formaldehyde, which is often not deciduous, since the mechanism of interaction between chromic anhydride and formaldehyde, and, consequently, the stoichiometric amounts of components, is significant. degrees depend on process conditions. Therefore, in a known raw material mixture, the amount of formapine is normalized in very wide limits. , In addition, binder production and working conditions are complicated by the presence of volatile and toxic formaldehyde in the raw mix. The purpose of the invention is to create a raw material mixture for producing calcium alumochromophosphate binder, which simplifies the processing technology of the mixture and improves the condition of VIY labor. The goal is achieved by a raw mixture containing, in wt%, a phosphorus compound in terms of orthophosphoric acid 36-40 connecting hexavalent chrolus in terms of chromic anhydride 10-13 calcium compound, in terms of calvic oxide 4-5, aluminum compound in terms of aluminum hydroxide 5-6 and a compound of trivalent chromium in terms of chromium oxide 4-5, water - the rest. As a phosphorus compound, it is advisable to use individual or mixed chromium. As a trivalent chromium compound, either the average chromium phosphate Cv-PO — MH2.0 as a hydrated product with an AND 5-12, or a monosubstituted chromium phosphate Cl (H-iP04 3 HHjO, where h is 3.5-6; either mixed phosphates of chromium and aluminum in the form of medium or acid salts, or hydrated chromichromates of composition 2CK2Oi, -CfO, where M is 70-90, or chromium hydroxide is СG2O IN20, where VI is 15-22. As a compound of hexavalent chromium and calcium, In addition to chromic anhydride and calcium hydroxide, chromate and calcium carbonate are used, respectively. The mixture provides calcium aluminochromophosphate binder with a given content of trivalent and hexavalent chromium, stably providing the CvjO ratio: within the required limits, namely, 0.37-0.41. P r and MB p 1.As chrome- (W and phosphorus-containing raw materials using the average chromium phosphate composition CrPO -fSHjO., -containing,. weight.%: a compound of trivalent chromium in terms of 18, a compound of phosphorus in terms of .H, Р04 23, 2. Prepare the raw meal as follows. To a 0.171 liter of technical orthophosphoric acid with a content of 73%, 62.0 g of chromic anhydride is added, heated to 50 ° C and stirred until complete dissolution. 70 g of a water pool is added to the resulting solution: hydroxide aluminum oxide with 81.8 g Ae (OHUn 160 g of milk of lime with 23.1 CaO heated to 100 ° C and kept at this temperature until all components are dissolved. Then 141.5 g wet sediment of average phosphate, containing 25.5 g Cl-j Oz and 32.9 g, obtaining a raw mixture with the following content of components, wt.%: Phosphorus compound in terms of orthophosphoric acid (,; hexavalent chromium compound in conversion to chromic anhydride (CgOz) 10.7; aluminum compound in terms of aluminum hydroxide neither C De (OH})) 5.5; a calcium compound in terms of calcium oxide, qi (CaO) 4.0; a compound of trivalent chromium in terms of chromium oxide (SG2 O) 4, 4. The calcium alumochromophosphate binder of this raw material mixture is heated with stirring to 100 ° C and maintained until complete dissolution of the average chromium phosphate.The reaction mixture is cooled and the desired product is obtained with a weight ratio of —CrOz 0.41 and density. 1,574 g / cm. PRI mme R 2. As chromium (| 1) -and phosphorus-containing raw material, monosubstituted chromium phosphate of the composition (H2P04) 545I2O is used, containing, by weight%: chromium compound (III) in terms of CrjOj 18; phosphorus compound in terms of Nzrol 69,5. Water and 63/6 g of chromic anhydride are added to 0.120 l of orthophosphoric acid in Example 1 and heated to 50 s and kept under stirring until complete dissolution of chromic anhydride, then the temperature is raised to and introduced 65 g of aqueous aluminum hydroxide slurry with 31.2 gAPON ) and 200 g of milk of lime with 28; 4 g of CaO, is heated to 100 ° and maintained at this temperature until complete dissolution of the components. 134 g of powdered chromium acid phosphate, containing 23.6 gCaO3 and 91 g, are added to obtain a raw mixture with the following component content, wt%: phosphorus compound in terms of HjPO 38.4; hexavalent chromium compound in terms of HaCf-Oj 10.8, aluminum compound in terms of AE (OH 1%, calcium compound in terms of CaO 4, O, compound of three g of chromium in terms of Ci-flO 4,4D for semi-calcium chromophosphate binder this raw mixture is heated with stirring before and incubated for 0.5 h. The reaction mixture is cooled and the desired product is obtained with the weight

the ratio of CgUO CrO, 0.38 and density of 1.57.

Example As chromium (III) -, aluminum- and phosphorus-containing raw materials, chromium-aluminum phosphate binder is used in the form of a liquid product of the composition CrAe, (H, Р04) d, containing, by weight. %: a compound of trivalent chromium in terms of Cg20zb, 0 compound of aluminum in terms of AEfOH) - 7.3; phosphorus compound, in terms of HjPO - 47.6.

Chromic anhydride in an amount of 88.9 g is dissolved in 50 ° C water, then 228 g of milk of lime containing 31.9 g of C0 0 is added and the temperature of the mixture is increased to. B the resulting solution is then added 400 ml of chromium aluminum phosphate a binder of the above composition containing 36 g of CraOv 37 g of wood) and 290 HjPO4, obtaining a raw mix with the following content of components, wt.%: phosphorus compound in terms of HjPQij. 36.1; Hexavalent chromium compound in terms of Cgd 0 11.1; aluminum compound in terms of AC (OH) s 5.6} calcium compound in terms of CaO 4.0; trivalent chromium compound in terms of Cr2054, 5.

In order to obtain the calcium aluminochromophosphate binder, this raw mixture is heated to 100 ° C and kept at this temperature for 0.5 hours. After cooling, the desired product is obtained with a ratio ClTj 0 Cr Oj 0.405 and a density of 1.433.

Example4. As chromium. (HI) -, aluminum - and phosphorus-containing raw materials use the average mixed chromium phosphate and aluminum in the form

water paste composition (Р04) 24 containing ,, weight. %: a compound of trivalent chromium in terms of Cr.jOj 7.4} an alcumin compound in terms of A6 (ONH 10g9} a phosphorus compound in terms of 23.2.

To a solution of 0.122 l of orthophosphoric acid of Example 1 in water was added 54.6 g of chromic anhydride, heated to and kept under stirring until complete dissolution. Then, 155 g of lime milk with 21.7 g of CaO are introduced and dissolved under the same conditions. The resulting solution is heated to and air conditioning with 300 g of wet medium mixed chromium and aluminum phosphate of the indicated composition, containing 22.2 l of SGDO 32, 7 AB (OH) and 69.5 g of H5PO4 i to obtain a raw mixture with the following content of components, weight .%: phosphorus compound in terms of 38.0; hexavalent chromium compound in terms of ROSF ;; aluminum compound in terms of Ar (OH) s 6.0} calcium compound in terms of CaO 4.0; compound

trivalent chromium in terms of Cg20g 4.1.

To obtain a calcium aluminochromophosphate binder, this raw material mixture is heated with stirring to 100 ° C and held until complete dissolution of the average chromium phosphate and aluminum. The reaction mixture is cooled and receive the target product with a weight ratio

 : CtO) 0.405 and density

1.55 g / cm.

P t and measure 5. As chromium (III) - chromium (VI) - containing raw materials, hydrated chromchromates are used in the form of an aqueous paste of the composition

, -. VZNaO containing, wt.%: Compounds of trivalent chromium in terms of a compound of hexavalent chromium in terms of, 3}

Calcium chromate of calcium composition is used as a calcium and chromium hexavalent compound. , containing, in wt.%: the calcium compound in terms of Cao 34,6; hexavalent chromium compound in terms of, 0.,

113 g of calcium chromate containing 38 g of CaO and 67.8CgO} are added to water to a solution of 0.187 l of orthophosphoric acid of Example 1 in water, the mixture is heated to and kept under stirring until complete dissolution of calcium chromate. The resulting solution is adjusted to 80 s and the SOr is introduced

aqueous aluminum hydroxide paste with 49.1 gAE (OH)} and dissolved at. Then, 200 g of hydrated chromium chromates of the indicated composition, containing 32 rCVjOijH 10.5, are added to obtain a raw mixture with the following

content of components, wt.%: phosphorus compound in terms of H3PO4 37.2} of hexavalent chromium bonded in terms of HaCrO 9, Bt aluminum compound in terms of

AE- (OH) 6.0} calcium compound in terms of CaO 4.7; a compound of trivalent chromium in terms of CrjOj 4.0.

Dp of obtaining calcium aluminochromophosphate binder, this raw material mixture is heated with stirring to and kept at this temperature to. complete dissolution of chromate. Reactionary

the mixture is cooled and get the target

product with a weight ratio of 0% 0.41 and a density of 1.65 g / cm

Example 6. As chromium (iH) - containing raw materials, hydrated chromium oxide is used, containing 30 wt.% CrjiOsi.

Claims (2)

To a solution of 0.222 liters of orthophosphoric acid of Example 1 in water, 72.5 g of chromic anhydride, heated, are added; It is left before and kept under stirring until complete dissolution of chromic anhydride. Then, 100 g of hydrated chromium oxide with 30 gSgaOg, 200 g of iveshtkovogo milk with 27.9 g of CaO and 80 g of aqueous aluminum hydroxide paste with 39.5 g of At (OH) - are added to the solution, heated to, successively. the mixture with the following containing components wt.%; phosphorus compound in terms of H5PO4 36.0 compound of six valent chromium in terms of CgO% 10.5; an alkmium compound in terms of L6 (OH) s5.7 is a calcium compound in terms of CaO 4.0, a compound of trivalent chromium and in terms of 4.3. In order to obtain alumina ophate .ci in a wound, the raw mixture is heated before and after {; boil at this temperature until complete solution of the introduced components is obtained. After cooling, the desired product with a ratio of 0.41 and a density of 1.54 g / cm. Similar results are obtained when using soda {;) 21 of a total car6on as calcium carbonate: calcium (example 1-4 and 6). This raw material mixture, as shown by experimental studies, consistently provides the calcium alumochromophosphate binder with the required co-operation of three (III) - and hexavalent chromium due to the introduction of E and its composition of the chromium (III) compound, simplifies the technology of its processing with obtaining because it eliminates the operation of controlling the completeness of chromium reduction (Vl improves the sanitary condition of labor in the preparation of the raw mix and its processing into a binder due to the exclusion of This invention proposes to use a whole range of commercial products as a raw material for the raw mix, which, in addition to a significant expansion of the raw material base, makes it possible to organize its production both at chrome plants and in the enterprises that consume calcium and chrome phosphate BACKGROUND OF THE INVENTION 1. A raw material mixture for producing a calcium aluminum chromophosphate binder containing compounds of phosphorus, calcium, aluminum, and hexavalent chromium. Characterized by the fact that, in order to simplify the processing technology of the mixture and improve working conditions, it additionally contains a compound of trivalent chromium with the following content of components, wt.% 1 phosphorus compound in terms of orthophosphoric acid 35-40 hexavalent chromium compound in terms of chromic anhydride 10-13} calcium compound in terms of oxide kyoshchy 4-6; the compound is shsyumini in terms of the hydroxide alkmini 5-6f a compound of trivalent chromium in terms of chromium oxide 4-5; water - the rest. 2. A mixture according to claim 1, characterized in that it contains individual or mixed chromium-containing phospsygs as a compound () and phosphorus .. 3. A mixture of POP.1, characterized in that it contains as a compound of trivalent chromium individual or mixed phosphates of chromium and albini, or hydrated chromichromates, or chromium oxide hydrate. 4. A mixture according to item i, o tl and ch and y with the fact that it contains chromate and calcium carbonate as a compound of hexavalent chromium and calcium. Sources of information taken into account during the examination 1. USSR author's certificate number 462900, cl. C 23 F 7/08, 02.07.75. 2. Authors certificate of the USSR 460267, cl. From 04 To 29/02, 29.12.72.