CN102311271A - Method for manufacturing silicon carbide based fire clay - Google Patents

Abstract

The invention relates to a method for manufacturing silicon carbide based fire clay, which belongs to the technical field of fire-resistant materials and is characterized in that: the silicon carbide based fire clay is made from the following raw materials in percentage by weight: 10-35% of silicon carbide particles with diameters of 1-0.088mm; 30-75% of silicon carbide fine powders with sizes of 150-325meshes; 3-30% of dextrins; 0.01-10% of sodium tripolyphosphate and lignosulfonate; and 15-80% of water. The method provided by the invention has the advantages of greatly simplifying the manufacturing process as well as the packaging and transportation conditions, reducing the production cost, being easy in preservation, having good water retentivity, increasing the bonding strength of the fire clay and improving the masonry property; and the fire clay manufactured by means of the method has good workability, no deposition and no water loss to ensure that the integrity in masonry and application is guaranteed and the service life of a furnace lining is prolonged.

Description

The method for making of silicon carbide refractory mud

Technical field

The present invention relates to a kind of method for making that contains silicon carbide refractory mud, belong to technical field of refractory materials.

Background technology

Silit is claimed powder emery or fire sand again.Silit is to form through pyrotic smelting in resistance furnace with raw materials such as silica sands, refinery coke (or coal tar), wood chip (when producing green silicon carbide need with salt).At present the industrial silit of China is divided into two kinds of black silicon carbide and green silicon carbides, is hexagonal, and proportion is 3.20～3.25, and microhardness is 2840～3320kg/mm ²

The present invention relates to a kind of preparation of silicon carbide refractory material, is that to build carbonization by laying bricks or stones siliceous, the good refractory mortar of clay-carborundum matter and silicon nitride combined silicon carbide matter refractory product.

Siliceous for guaranteeing internal lining of aluminium electrolytic bath, molten aluminum conduit and pottery kiln with carbonization in high temperature kilns such as kiln furnitures, big-and-middle-sized blast furnace stack bottom, furnace bosh and bosh, aluminium refining furnace furnace lining, zinc retort lining and the Thermal Equipment; The globality of clay-carborundum matter and the bricking of silicon nitride combined silicon carbide matter refractory product; Prolong the practical life of furnace lining; Make fire-resistant chamotte and refractory product reach same practical life, the corundum fireproof mud of developing the excellent property that possesses skills is very with practical value.

But silicon carbide refractory chamotte commonly used now uses liquid soluble glass to be wedding agent more, and is all very inconvenient in preparation, packing, transportation, and the refractory mortar bonding is slightly not high, and wedding agent is difficult to preserve.And water glass has the strong impulse flavor, and is bigger to the personnel's of building by laying bricks or stones skin corrosion, and this wedding agent applied temps is lower, is difficult to satisfy the high temperature request for utilization of silicon carbide brick.

Summary of the invention

It is simple to the objective of the invention is to prepare a kind of blending process; Be easy to preserve, easy to use, cohesive strength is high; Workability is good; Hot strength is high, is applicable to that internal lining of aluminium electrolytic bath, molten aluminum conduit and pottery kiln are siliceous with the carbonization of high temperature kiln such as kiln furnitures, big-and-middle-sized blast furnace stack bottom, furnace bosh and bosh, aluminium refining furnace furnace lining, zinc retort lining and Thermal Equipment, the silicon carbide refractory mud that clay-carborundum matter and silicon nitride combined silicon carbide matter liner are used.

The present invention implements through following technical solution: at first carries out the starting material apolegamy, adopts carborundum aggregate, and carbide fine powder, dextrin, and add composite additive, its raw materials by weight preparation:

Silicon-carbide particle 1-0.088mm 10-35%

Carbide fine powder 150-325 order 30-75%

Dextrin 3-30%

Tripoly phosphate sodium STPP and sulfonated lignin 0.01-10%

Water 15-80%

Beneficial effect of the present invention is:

Silicon carbide refractory mud provided by the present invention is raw material with carbonization silica sand or useless silicon carbide brick mainly, and the employing dextrin is a wedding agent, and adding a small amount of tripoly phosphate sodium STPP and sulfonated lignin is composite additive; Simplified preparation worker technology and packing and transport condition greatly, production cost is reduced, preserved easily; Have good water-retentivity, improved the cohesive strength of refractory mortar, improved building by laying bricks or stones property; Make the refractory mortar workability good, do not precipitate not dehydration; Guaranteed to build by laying bricks or stones with practicality in globality, prolonged work-ing life of furnace lining.

Specific embodiments

Embodiment 1: at first carries out the starting material apolegamy, adopts carborundum aggregate, and carbide fine powder, dextrin, and add composite additive, its raw materials by weight preparation:

Silicon-carbide particle 1-0.088mm 10%

Carbide fine powder 150-325 order 80%

Dextrin 10%

Tripoly phosphate sodium STPP and sulfonated lignin 5%

Water 40%

After raw material is selected, refractory mortar is carried out Performance Detection, detected result is following:

Embodiment 2: at first carries out the starting material apolegamy, adopts carborundum aggregate, and carbide fine powder, dextrin, and add composite additive, its raw materials by weight preparation:

Silicon-carbide particle 1-0.088mm 20%

Carbide fine powder 150-325 order 70%

Dextrin 10%

Tripoly phosphate sodium STPP and sulfonated lignin 5%

Water 40%

After raw material is selected, refractory mortar is carried out Performance Detection, detected result is following:

Claims (1)

1. the method for making of a silicon carbide refractory mud is characterized in that, said silicon carbide refractory mud is processed by following raw materials by weight percent:

Silicon-carbide particle 1-0.088mm 10-35%

Carbide fine powder 150-325 order 30-75%

Dextrin 3-30%

Tripoly phosphate sodium STPP and sulfonated lignin 0.01-10%

Water 15-80%.