Sodium silicate silica sand anti-sticking additive for cast steel and application method of additive

Abstract

The invention provides a sodium silicate silica sand anti-sticking additive for cast steel and application method of the additive. The sodium silicate silica sand anti-sticking additive is characterized by comprising the following materials: Al2O3, SiO2, Cr2O3 and Fe2O3; and the application method of the additive is characterized by comprising the following steps of: firstly adding the sodium silicate silica sand anti-sticking additive for cast steel and water in silica sand, equally mixing, adding sodium silicate, and continuously mixing equally, thus preparing the casting sand. The sodium silicate silica sand anti-sticking additive for cast steel and the application method of the additive, disclosed by the invention, have the advantages of effectively preventing sand sticking by forming a moderately sintered peelable sintering layer on a casting and molding surface during pouring process, reducing production cost, simplifying formative technology and decreasing clear-up works of the casting. Therefore, the surface of the produced casting is clean without sand sticking.

Description

technical field [0001] The invention relates to an additive used as an anti-sticking sand in cast steel production, in particular to a DH-type cast steel water glass quartz sand anti-sticking sand additive and a use method thereof. Background technique [0002] For a long time, sodium silicate sand has been used in casting production since the 1950s, especially in the production of steel castings, due to its advantages of simple equipment, easy operation, low cost, and non-toxicity. However, due to its poor collapsibility, serious casting sand sticking, poor surface quality and other defects, it limits its popularization and application to a certain extent. [0003] The pouring temperature of steel castings is generally above 1550°C, and the temperature of the mold interface rises to about 1500°C immediately after pouring. Under the action of strong heat, the metal oxide on the surface of the casting and the water glass sand mixture react chemically, and the formed silicate...

AI Technical Summary

Problems solved by technology

However, the price of special sand is very high, which greatly increases the production cost; brushing paint increases the process and has strict requirements on the performance of the paint

Although some people use anti-sand additives to prevent sand sticking in the production of iron castings, such as adding coal powder and coke powder, in a reducing atmosphere, this organic matter is decomposed by heat, and bright carbon is precipitated, which is deposited between the casting and the mold When the thickness is above 0.1mm, the sintered molding sand layer will automatically peel off, which can prevent sand sticking, but there are few reports on anti-sticking sand additives for steel casting