RAW MATERIAL MIX FOR PRODUCING REFRACTORY ARTICLES Russian patent published in 1995 - IPC

FIELD: production of refractories. SUBSTANCE: raw material mix includes fireclay, silica-containing material, graphite and orthophosphoric acid. Silica-containing material is in form of dust of gas cleaning of silicon production sizing within 1 mm. Additionally added are aluminum hydroxide, asbestos and water in the following amount, mas.%: orthophosphoric acid 1.5-3; fireclay 37-42; dust of gas cleaning of silicon production sizing within 1 mm 17-22; graphite 5-10; aluminum hydroxide 3-7; asbestos 12-17; water 8-10. Articles from offered mix are manufactured using the following procedure: (1) mixing of dry components: fireclay, dust of gas cleaning of silicon production sizing within 1 mm, graphite, aluminum hydroxide; (2) filled in produced mix is the required amount of orthophosphoric acid with density of 1.47 g/cu.cm and stirred; (3) adding into produced compound is asbestos (soared for 2 days and squeezed) and water. Then, sprue bushings are made from prepared mix by pressing. EFFECT: increased service life of articles due to increased slag-resistance and cut down manufacturing cost. 3 tbl