A binder for building materials comprising cement and mineral grinding additives, said grinding additives containing ash of burned refuse. Relative to the binder, the ash of burned refuse has a weight percent of 0.005 to 0.4 and a Blaine specific surface area of 1500 cm.sup.2/g to 6000 cm.sup.2/g. Also, a process and to a plant for carrying out the process for production of a binder for building materials comprising cement and mineral grinding additives, the grinding additives containing ash of burned refuse, the process including: preparing the ash of burned refuse provided as grinding additive by separating out the fraction having a particle size less than 1 mm and the oversize particles having a particle size greater than 40 mm; pre-crushing the ash of burned refuse which has been freed from the undersize particles and the oversize particles; removing ferrous and non-ferrous metals; further crushing of the pre-crushed ash of burned refuse which has been substantially freed from metals, in order to achieve a Blaine specific surface area from 1500 cm.sup.2/g to 6000 cm.sup.2/g, adding the ash of burned refuse prepared in this way to the cement before and/or after the further crushing of the ash of burned refuse which has been pre-crushed and substantially freed from metals.

A binder for building materials comprising cement and mineral grinding additives, said grinding additives containing ash of burned refuse. Relative to the binder, the ash of burned refuse has a weight percent of 0.005 to 0.4 and a Blaine specific surface area of 1500 cm.sup.2/g to 6000 cm.sup.2/g. Also, a process and to a plant for carrying out the process for production of a binder for building materials comprising cement and mineral grinding additives, the grinding additives containing ash of burned refuse, the process including: preparing the ash of burned refuse provided as grinding additive by separating out the fraction having a particle size less than 1 mm and the oversize particles having a particle size greater than 40 mm; pre-crushing the ash of burned refuse which has been freed from the undersize particles and the oversize particles; removing ferrous and non-ferrous metals; further crushing of the pre-crushed ash of burned refuse which has been substantially freed from metals, in order to achieve a Blaine specific surface area from 1500 cm.sup.2/g to 6000 cm.sup.2/g, adding the ash of burned refuse prepared in this way to the cement before and/or after the further crushing of the ash of burned refuse which has been pre-crushed and substantially freed from metals.

A method and apparatus to reclaim metals from scrap material such as automobile shredder residue (ASR) that, after separating out light density components, separates out friable material such as rock and glass by crushing and screening operations to generate a high metal content product.

A method and apparatus to reclaim metals from scrap material such as automobile shredder residue (ASR) that, after separating out light density components, separates out friable material such as rock and glass by crushing and screening operations to generate a high metal content product.

A process of recovering clean sand and active clay from sand or dust from a foundry is disclosed.

A process of recovering clean sand and active clay from sand or dust from a foundry is disclosed.

A system and method for recovering metals from a waste stream includes or uses a feeder, a first screw separator, a slurry tank, and a second screw separator configured to receive carrier fluid and particles from the slurry tank. The method and system can include feature to improve water usage.

A system and method for recovering metals from a waste stream includes or uses a feeder, a first screw separator, a slurry tank, and a second screw separator configured to receive carrier fluid and particles from the slurry tank. The method and system can include feature to improve water usage.

Disclosed is a pretreatment method for utilization of coal pond ash (coal ash buried in ash ponds near coal-fired power plants), and more specifically a treatment method of coal pond ash capable of utilizing coal ash with high efficiency through simple separation processes including screening, float-sink, flotation, grinding, and magnetic separation.

Disclosed is a pretreatment method for utilization of coal pond ash (coal ash buried in ash ponds near coal-fired power plants), and more specifically a treatment method of coal pond ash capable of utilizing coal ash with high efficiency through simple separation processes including screening, float-sink, flotation, grinding, and magnetic separation.