Manufacturing method of heat-insulating materials

FIELD: construction.

SUBSTANCE: manufacturing method of heat-insulating material consists in manufacture of products from composite material based on cement, mortar sand and CHP ash and slag wastes at the ratio of cement:sand:ash and slag wastes components equal to 33:22:44, their saturation in a modified sulphur melt; titanium chloride, or iron chloride, or zinc chloride is used in the amount of 0.8-1.2 % of sulphur weight as a modifying agent of the sulphur melt.

EFFECT: improving strength, reducing coefficient of heat conductivity and water saturation of a heat-insulating material.

2 tbl

 

The invention relates to the construction materials industry, in particular to a method for manufacturing a heat-insulating material, and can be used for the manufacture of insulating material intended for thermal insulation of attic, basement floor slabs, interior partitions, facades of buildings. The material obtained by the proposed method can be also used as sound insulation material.

For insulating materials specified destination extremely important indicators are: low thermal conductivity, high mechanical strength, low water absorption.

A method for manufacturing a heat-insulating material, which comprises impregnating a melt of sulfur Solomona (Turapov Mahmoud. Development of technology and the study of the properties of Solomona soaked grey: dis. Cand. tech. Sciences: 05.23.05. - Moscow, 1979).

However, the disadvantages of this method are:

- low strength (12-43 MPa);

- high water absorption (7-8%);

- high thermal conductivity (0,66-1 W/(m·°C));

- long lasting impregnation (at atmospheric pressure was 3, 5, 24 and 48 hours).

The closest analogue to the claimed invention is a method for the manufacture of insulating materials, sign�ISA in the manufacture of products from composite material based on cement, construction sand and ash and slag waste of thermal power plant, the impregnating them in the sulfur melt, modified to reduce the viscosity and improve a sealing ability of the sulfur melt with sodium silicate (Medvedev G. A., Akhmetov R. T., etc. Disposal of waste heat in a water-resistant composite materials. // News kgasu. - 2013. - №2 (24) - P. 320-325).

However, these materials have insufficient strength.

The aim of the invention is to provide a method of manufacturing a heat-insulating material having low thermal conductivity, high mechanical strength, low value of water absorption.

The technical result - increasing the strength of the insulating material, reduction of thermal conductivity and water absorption.

The technical result is achieved in that in the method of manufacturing a heat-insulating material, which consists in the manufacture of products from composite material based on cement, construction sand and ash and slag waste of thermal power plant, the impregnating them in a modified sulfur melt, according to the invention the composite material is produced at a ratio of cement:sand:ash wastes, is 33:22:44, and as a modifier of the sulfur melt using titanium chloride, or ferric chloride, or x�arid of zinc in the amount of 0.8-1.2% by weight of sulfur.

For the preparation of thermal insulation materials used composite material comprising a binder - cement, filler and construction sand and slag wastes of thermal power stations and the impregnating material is modified sulfur melt.

The binder used:

- Portland cement grade 100 (GOST 31108-2003).

As fillers used:

- ash and slag wastes (ASW) Kazan CHP-2 (GOST 25818-91) of the following composition (wt.%):

SiO247,7-52,2
Al2O3+Tio221,24-25,28
Fe2O35,2-5,9
CaO+MgO4,3
SO3(General)0,2
K2O+Na2O1,84-19,03.

- sand for construction Udinskogo field RT (GOST 8736-93).

For the preparation of modified sulfur melt used sulfuric waste Nizhnekamsk refinery RT (GOST 127-93) containing 99,98% sulfur.

As modifiers:

chloride titanium (TU 6-09-2118-77);

- ferric chloride (GOST 4147-74);

chloride Qing�a (GOST 4529-78).

The samples were prepared as follows. The original components of the composite material were milled to a fineness of not more than 0.5 mm. Cement, sand and ash wastes were taken in the ratio 33:22:44 and mixed to obtain a homogeneous powder mass. Was then added water (depending on the rate of water absorption), again thoroughly mixed and the resulting composition was placed in the forms. To avoid sticking of the composition to the metal of the mold wall was lubricated with machine oil. Each sample was kept in special forms of 2×2×6 cm within 28 days for curing.

Next was carried out by impregnation of the samples in the sulfur melt, modified titanium chloride, or zinc, or iron. The amount of modifier is equal to 0.8 to 1.2% by weight of the sulfur melt. Modified sulfur melt is prepared by mixing sulfuric waste with each modifier.

For impregnation of samples of insulating material, a modified sulfur melt is pre-heated at T=140°C for 30 minutes, then the samples were dipped into the melt and held for 40 min. Then the prepared samples were removed and cooled to room temperature.

With the obtained samples was carried out physical and mechanical tests according to:

GOST 10180-90 (STSM 3978-83). The concretes. Methods for determination of strength to control samples;

GOST 12730.3-78. The concretes.Method for determination of water absorption;

GOST 12730.1-78. The concretes. Method of determining density;

GOST 7076-99. Materials and construction products. Method for determination of thermal conductivity and thermal resistance under a stationary heat flux.

The proposed and known compounds of insulating materials shown in table 1.

The results of physico-mechanical tests of the samples are given in table 2.

Table shows that the proposed formulations characteristics (compressive strength, water absorption and thermal conductivity coefficient) is significantly better than in the prototype.

Thermal insulation material, manufactured by the proposed method has a high compressive strength of 2.5 times, a low coefficient of thermal conductivity (40%) and low value of water absorption (20%).

A method of manufacturing a heat-insulating material, which consists in the manufacture of products from composite material based on cement, construction sand and ash and slag waste of thermal power plant, the impregnating them in a modified sulfur melt, characterized in that the composite material is produced at a ratio of cement:sand:ash wastes, is 33:22:44, and as a modifier of the sulfur melt using titanium chloride, or ferric chloride, or chlorine� of zinc in the amount of 0.8-1.2% by weight of sulfur.



 

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FIELD: chemistry.

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9 cl, 7 ex, 3 tbl

FIELD: construction.

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2 tbl

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1 tbl, 1 dwg

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6 cl, 7 dwg

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2 cl, 1 tbl

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2 tbl

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2 tbl

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2 tbl

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1 tbl

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1 tbl

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1 tbl

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2 tbl

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8 cl, 1 dwg

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1 tbl

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1 tbl

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1 tbl

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7 cl, 3 tbl

FIELD: construction.

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2 cl, 5 dwg, 1 tbl

FIELD: production of micro-spheres from fly ash of thermal power stations.

SUBSTANCE: micro-spheres are used as fillers for building materials and light cements and composite materials; they are also used for manufacture of light sealants, putties, dyes, adhesives, composite wood materials, explosives; manufacture of materials sorbing toxic metals at preservation and protracted storage of radioactive wastes. Proposed method of obtaining micro-spheres from aqueous suspension of fly ash of thermal power stations includes hydraulic separation, removal of emersed micro-spheres, dehydration of micro-spheres and drying them. Removal of emersed micro-spheres by means of mobile plant - ejector pump with filtering attachment at rate of suction of aqueous suspension of 20-250 m3/h from surface of pontoon bottom having area of 5-100 m2 which is pressed to lower layer of micro-spheres by fractions in multi-stage rotary drum-type classifier provided with self-cleaning surfaces of screens for screening-out the micro-spheres.

EFFECT: enhanced efficiency and technical reliability; intensification of micro-sphere extraction process.

4 cl, 3 tbl, 1 ex

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