Good foundry mould coke made from cold-pressed briquette of Taixi coal

The superfine foundry mould coke with high density, low ash and sulfur content, and high strength is the product demanded in national and international market. Taixi fine foundry mould coke has been made in cold pressed briquette. The project first prepares briquette in compressive strength more than 100 kg 1 cm2, then cokes briquette to make good foundry mould coke by choosing to use Taixi coal with characteristic of low ash and sulfur content as basic constituent, blending an amount of 1/3 coking coal in caking index more than 92, choosing coal tar and pitch as binder. The foundry mould coke is smooth in section and shows a silvery metallic gloss without macroscopic crack and with less porosity. Therefore, the foundry mould coke belongs to high density foundry coke. Except the sulfur content beyond standard a bit, the other indexes reach and surpass the standard of superfine foundry coke. The project mainly surmounts the following techniques:(1)to select the best coal type, fineness, material, and raw material ratio;(2)to adopt particular temperature of coke oven and coking process, use coal bar and pitch as binder to improve the internal structure of formcoke;(3)the binder constituents of the project free from coal types. The experiments have proved that coking coal, fat coal, gas fat coal and gas coal can all be used as coal blending. The paper discusses that coal like Taixi anthracite, adopts formcoal techniques to produce fine foundry mould coke which can bring about remarkable economic profits.