The invention relates to an electric glass furnace (100) comprising a tank (110) with a cold or semi-cold top and also electrodes (150) for melting raw materials (130) introduced into the tank and thereby obtaining a bath (120) of molten material, the tank having a side wall (112) comprising an opening (113) configured to allow the molten material to flow out of the tank. The furnace additionally has means referred to as delaying means (170, 180), which are at least partially immersed in the bath and are positioned in vertical alignment with the opening and in proximity to the side wall of the tank and are configured to increase the dwell time, in the tank, of the raw materials that are introduced in proximity to the delaying means.

Methods and systems include melting or augmenting a melt rate of material in a melter using electromagnetic radiation with a frequency between 0.9 GHz and 10 GHz. In some examples, a power and/or frequency of radiation used may be selected so as to control a temperature of a cold cap in the melter while maintaining emissions from the melter below a threshold level. In this manner, examples described herein may provide for efficient and safe melting and vitrification of radioactive wastes.

A method of and an arrangement for recycling mineral wool waste to mineral wool production includes at least one melting furnace for melting virgin mineral wool raw material, the melting furnace including an inlet for virgin mineral wool raw material and an outlet for molten mineral wool material, a production line connected to the outlet for molten mineral wool material for producing a mineral wool product from the molten mineral wool material. The production line includes a curing oven, a fluidized bed reactor including an exhaust gas duct, an inlet for predetermined primary fuel, an inlet for predetermined bed material, and an outlet for an ash material, the ash material including bottom ash discharged via a bottom outlet from the fluidized bed reactor or fly ash separated by a particle separator from exhaust gas in the exhaust gas duct or a mixture of the bottom ash and the fly ash.

This disclosure relates to fabrication of quartz hollow cylinder with reduced bubbles using atmospheric control. An example horizontal rotating arc furnace includes a housing, supports, and a rotary union. The housing defines an interior configured to receive silica particles and electrodes that generate a plasma arc and includes a plurality of first ports on an exterior of the housing fluidly connected to the interior and supply pipes fluidly coupled to the first ports. The supports mechanically couple the housing to a drive system to provide rotational motion to the housing. The rotary union is coupled to the housing includes second ports to fluidly connect to a vacuum supply. The second ports are fluidly connected to the first ports via the supply pipes. The horizontal rotating arc furnace is configured to apply a vacuum to the interior of the housing via the first ports when the housing is spinning.

Provided is a glass production method with which oxidation can be suppressed and productivity can be increased. A glass production method according to the present invention includes the steps of: turning a raw material 6 placed in a container 1 into a melt 11; homogenizing the melt 11; removing a gas from the melt 11, wherein at least one of the step of turning the raw material 6 into the melt 11 and the step of homogenizing the melt 11 is performed in an atmosphere of an inert gas or a reducing gas, and in the step of the removing the gas from the melt 11, the inert gas or the reducing gas is removed by setting the temperature of the melt 11 to be lower than the temperature in the step of homogenizing the melt 11.

A glass fining system, multi-stage vacuum housing, and method are disclosed. The glass fining system includes a multi-stage vacuum housing comprising a first melt receipt tank configured to receive molten material, where the first melt receipt tank is disposed in a first vacuum chamber; a first refining channel configured to flow the molten material from the first melt receipt tank through a second vacuum chamber; a second melt receipt tank configured to receive the molten material from the first refining channel, where the second melt receipt tank is disposed in a third vacuum chamber; and a second refining channel configured to flow the molten material from the second melt receipt tank and through a fourth vacuum chamber; and a glass melter coupled to the multi-stage vacuum housing.

The present invention relates to a process for preparing a mineral melt in a cupola furnace that comprises a plasma torch that heats mineral material and waste or recycled mineral material to form the melt, wherein the waste or recycled mineral 5 material is introduced into the furnace through a waste inlet located in the side wall of the furnace hot zone.

The present invention is directed to a vertical volcanic rock melting furnace having a reduced spatial footprint relative to prior art furnaces. The melting furnace includes a top melting section, which raises the temperature of a charge above the liquidus temperature, a middle cooling section configured to reduce the temperature of the melt, and a bottom conditioning section configured to maintain the melt above a crystallization temperature before the melt is distributed to one or more bushing plates to extrude into fibers. The top melting section and the bottom conditioning sections are surrounding by induction coils for inductively raising the temperature of the melt.

An automatic advancement device for a tin oxide electrode of an electronic glass furnace is provided. The device comprises at least one motor drive unit, a motor guide unit, and a motor control unit. Each motor drive unit includes a worm gear set, a coupling, a push rod, and a reduction motor. The worm gear set is connected to the reduction motor via the coupling. The push rod is installed at an end of the worm gear set. The motor guide unit includes a transport device on which the motor drive unit is installed and a guide device installed at a bottom of the transport device. The transport device moves along the guide device to control an advancement direction of the motor drive unit. The motor control unit is connected to the reduction motor and configured to control the reduction motor to advance the push rod.

An automatic advancement device for a tin oxide electrode of an electronic glass furnace is provided. The device comprises at least one motor drive unit, a motor guide unit, and a motor control unit. Each motor drive unit includes a worm gear set, a coupling, a push rod, and a reduction motor. The worm gear set is connected to the reduction motor via the coupling. The push rod is installed at an end of the worm gear set. The motor guide unit includes a transport device on which the motor drive unit is installed and a guide device installed at a bottom of the transport device. The transport device moves along the guide device to control an advancement direction of the motor drive unit. The motor control unit is connected to the reduction motor and configured to control the reduction motor to advance the push rod.