Low springback rate spraying and coating material for thermal-state blast furnace maintenance and preparation method thereof

Abstract

The invention provides a low springback rate spraying and coating material for thermal-state blast furnace maintenance and a preparation method thereof. The spraying and coating material comprises the following raw materials in percentage by weight: 30-50% of synthetic mullite particles with the diameter of 5-0mm, 30-50% of A-level flint clay particles with the diameter of 5-0mm, 10-25% of synthetic mullite powder of 200-325 meshes, 0-15% of A-level flint clay powder of 200-325 meshes, 3-8% of aluminate cement, 2-7% of clay powder, 1-3% of silica micropowder of 2-5mu, 3-6% of aluminum oxide micropowder of 5mu, 0-0.3% of polyphosphate, 0-0.3% of metaphosphate, 0.5-3% of lignosulphonate calcium powder and 0-0.3% of organic fiber,The invention has the outstanding characteristics that the springback loss is small, waste of raw materials in the process of construction is reduced on one hand, and the start-up operation of the furnace is facilitated on the other hand; and the spraying and coating material provided by the invention meets the performance requirements on performances such as strength, scouring resistance, scouring and permeation resistance, rapid construction at 150-300 DEGC and the like, and is especially suitable for an unshaped refractory for thermal-state blast furnace lining maintenance. The invention has the outstanding characteristics that the springback loss issmall, waste of raw materials in the process of construction is reduced on one hand, and the start-up operation of the furnace is facilitated on the other hand; and the spraying and coating material provided by the invention meets the performance requirements on performances such as strength, scouring resistance, scouring and permeation resistance, rapid construction at 150-300 DEG C and the like, and is especially suitable for an unshaped refractory for thermal-state blast furnace lining maintenance.

Description

technical field [0001] The invention relates to a monolithic refractory material for repairing and repairing blast furnace linings in a hot state in the metallurgical industry, and provides a low-rebound rate spray coating for hot repairing blast furnace linings and a preparation method thereof. Background technique [0002] my country's blast furnace thermal gunning technology began in 1992 with Baosteel's 1# blast furnace, which was imported from Japan. After that, Baosteel developed a remote-control gunning machine by itself, and the General Institute of Metallurgical Construction Research provided gunning materials. The gunning industrial test was successfully carried out. Subsequently, gunning technology has been greatly developed in China. [0003] Blast furnace hot gunning technology is to repair the furnace type by hot gunning on the damaged part of the furnace lining when the blast furnace is off, so as to improve the circumferential and axial balance of the lining,...

AI Technical Summary

Problems solved by technology

The rebound rate of the gunning material has a great relationship with the adhesion, and the poor adhesion will directly affect the performance of the gunning material in the high temperature environment

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