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1. 发明专利

JPH06345511A COMPACT WITH FINE QUARTZ SAND POWDER AS AGGREGATE 失效
公开(公告)号：JPH06345511A
公开(公告)日：1994-12-20
申请号：JP13818793
申请日：1993-06-10
申请人： HITACHI METALS LTD , HIYOUYA KK
发明人： MINE NAOKI , ENDO AKIRA , NAKAMURA AKITOSHI , MORI HIROSHI
IPC分类号： C04B28/02 , E01C5/00
摘要： PURPOSE:To reutilize the industrial waste such as dust collected in regenerating molding sand, the fine powder of molding sand and quartz sand and obtain a compact from the waste by using a combination of the waste, aggregate, cement admixture and water. CONSTITUTION:An aggregate consisting of 70-80wt.% of fine quartz sand powder having 2-30mum grain size, 20-10wt.% of coal powder, 5-7wt.% of bentonite and the balance farina and iron oxide powder, 40 to 60wt.% of cement, based on the aggregate, 5-20wt.% of cement admixture and 25-65wt.% of water based on the cement are mixed. The mixture is formed by a vibrating press-forming machine into the compact of specified shape. Meanwhile, the bentonite is obtained by mixing alkali and alkaline-earth bentonite to utilize the respective binding properties, the farina is added to increase the fluidity of the mixture, and the iron oxide is added to redden the mixture.

2. 发明专利

JPH074013A FLOOR PLATE FOR FREE ACCESS AND ITS PRODUCTION 失效
公开(公告)号：JPH074013A
公开(公告)日：1995-01-10
申请号：JP14309693
申请日：1993-06-15
申请人： HITACHI METALS LTD , HISAGOYA KK
发明人： MINE NAOKI , ENDO AKIRA , NAKAMURA AKITOSHI , MORI HIROSHI
IPC分类号： C04B28/02 , E04F15/024 , E04F15/08
摘要： PURPOSE:To obtain a light and cost effective floor plate, by reusing pan, which is collected dust on reproducing molding sand, as a raw material and mixing it with a raw material of cement or the like. CONSTITUTION:Cement 60-80wt.%, admixture 3-4wt.% to cement, AE water reducing agent 1.0-2.0wt.%, and water 20-30wt.% are mixed with aggregates composed of pan 50-70wt.%, fine silica and 50-30wt.% having 2-30mum size distribution, and kneaded with together to obtain a molding 1. Vinylon fiber 1-2wt.% to cement is mixed in the molding 1. Further, a steel plate with pierced holes and protrusions or a welding metallic net with legs are buried in the molding 1. Accordingly, collected dust and molding fine silica sand can be reused as a raw material and hence, the cost can be reduced.

3. 发明专利

JPH06297076A REGENERATING TREATMENT OF LOW-GRADE FRESH SAND 失效
公开(公告)号：JPH06297076A
公开(公告)日：1994-10-25
申请号：JP8747293
申请日：1993-04-14
申请人： HITACHI METALS LTD , HISAGOYA KK
发明人： SATO YASUTAKA , ENDO AKIRA , MINE NAOKI , MORI HIROSHI
IPC分类号： B22C5/04
摘要： PURPOSE:To regenerate high-grade fresh sand by amelioration of grain shapes, removal of viscous components and impurities, etc., by treating the low-grade fresh sand with a molding sand regenerating device of a polishing type with a grindstone, thereby imparting roundness to the sand grains of the fresh sand. CONSTITUTION:The required amt. of the low-grade fresh sand having

4. 发明专利

JPH06170486A EQUIPMENT AND METHOD FOR RECONDITIONING CASTING SAND 失效
公开(公告)号：JPH06170486A
公开(公告)日：1994-06-21
申请号：JP32104192
申请日：1992-11-30
申请人： HITACHI METALS LTD
发明人： SATO YASUTAKA , ENDO AKIRA , MINE NAOKI
IPC分类号： B22C5/00 , B22C5/02 , B22C5/04 , B22C5/06 , B22C5/14
摘要： PURPOSE:To recondition the used casting sand to be one similar to the new casting sand by using a centrifugal friction type casting sand reconditioning equipment and a grinder polishing type casting sand reconditioning equipment as a coarse and fine reconditioning equipment respectively in a combined manner. CONSTITUTION:When the used casting sand is reconditioned, a dry centrifugal friction type casting sand reconditioning equipment 1 as a coarse reconditioning equipment of the casting sand, and successively, a dry grindstone grinding type casting sand reconditioning equipment 11 as a fine reconditioning equipment are used in a combined manner. For example, the used casting sand is continuously reconditioned at the rate of 3t/hour by the centrifugal friction type casting sand reconditioning equipment 1. When the batch finishing reconditioning of this reconditioned sand is executed by the grindstone grinding type casting sand reconditioning equipment for 25 minutes, the increase of SiO2, reduction of acid consumption and reduction of the ignition loss can be obtained. Thus, the baked carbide and the clay layer adhered to the sand grain surface can be ground and separated, and the casting sand in the condition close to the new one can be reconditioned, the projecting part of sand grain is removed, and the grain shape is improved to be round.

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