SU329797A1 - Charge for obtaining aluminium-silicon alloys - Google Patents

Description

The known charge for producing aluminum-silicon alloys, state 1aa, is from silica-alumina raw material (62-70%), carbon-containing reducing agent (25-35%) and binder (0-10%).

The proposed charge is characterized by the following content of components, wt.%:

Silica-alumina

raw material62-70

Oil Noah (pitch)

coke 6.2-14.0

Coal 15-27

Bound 0-10

moreover, the refining of petroleum (coke coke to coal is 1: 1.5–3.0, and the total content of nonvolatile carbon in the charge is 93–97% of the stoichiometric amount of carbon needed to reduce the oxides of the charge to metals and oxidize carbon to This increases the purity of the resulting alloys, improves technological performance and stabilizes the furnace operation mode with specific electric

It should be noted that the determining effect on technology and indicators of ore-smelting smelting in the production of aluminum-silicon alloys is exerted by such factors as the content of carbon-containing materials in the charge, sintering and gas permeability of the charge at the furnace top. Not only the technological parameters of the process, but also the operating mode of the furnace and its parameters depend on the properties of the charge in the conditions of ore-smelting smelting. Violations of the properties of the charge and the mode of operation of the furnace are mainly

in the mismatch of the rate of discharge of the charge (due to the lack of its proper sintering and gas permeability at the furnace top) to the value of the specific electric power at the furnace electrodes. Attempting to limit the charge flow only by changing the electrical change in the smelting mode, for example, by decreasing the furnace or decreasing the operating voltage while simultaneously increasing the current in the electrodes usually leads to a deterioration in the control characteristics of the furnace and to an increase in unproductive energy and energy.

The proposed mixture satisfies the requirements of normal operation of a furnace with different specific electric power at the electrodes. This is achieved by using the mixture with a mixture of carbon-containing reductants, which differ considerably in their influence on the cake and charge rate of the mixture during its melting. The low-grade metamorphism used in the mixture stimulates accelerated descent of the mixture during smelting and its higher gas permeability. The oil or peck cokes used as the second reducing agent, on the contrary, increase the sintering and slow down the charge of the charge during its melting. Depending on the specific electric power on the furnace electrodes, the proper melting technology properties of the ceramic are selected by changing the weight ratios in the charge indicated carbon-containing reducing agents with preservation of the total content of non-volatile carbon in the charge from 93 to 97% of the stoichiometric amount of carbon required for the reduction of shea oxides you to metals and its oxidation to carbon monoxide.

According to tests carried out on industrial furnaces, it has been established that as the specific power on the furnace electrodes increases, the optimum content of petroleum (pitch) coke in the charge increases, and the coal content decreases.

For example, when the furnace power is below 10,000 KW or with a specific electric power at the electrodes up to 300 W / cm, higher technological parameters are obtained when the mixture of reducing agents contains 0-20% of petroleum (pitch) coke and 80-100% of coal.

When the capacity of the furnace from 10,000 to. 12,000 kW or with a specific electric power at electrodes above 300 W / CM, higher technological parameters of melts were provided at the charge, which uses a mixture of reducing agents containing 20-40% of petroleum (pitch) coke and 60-80% coal.

Thus, to maintain a stable operating mode of the furnace with a specific electrical magnitude on the electrodes above 300 W / cm, it is necessary to use a mixture of reducing agents

10 in the charge, in which the ratio of petroleum (pitch) coke to coal 1: 1.5-3.0. Such a charge allows, in addition to the stable operation of the furnace, to obtain higher technological parameters and reduces the content of iron impurity in the resulting alloy by 0.1-0.2% (absolute).

Claims (2)

1. Batch for producing aluminum silicates of Z1x alloys containing silica-alumina raw materials, carbon-containing reductant and bonding 5, characterized in that, in order to increase the degree of alloys obtained, improve technological indicators and stabilize the operation mode of the furnace with specific electrical density on the electrodes . above 300 W / CM, its composition contains the following components, wt.%: Cressem-alumina raw material62-70 Oil Noah (pitch) coke 6.2-14.0 Coal15-27 Bound 0-10 2. The mixture according to claim 1, characterized in that the ratio of petroleum (pitch) coke to coal is 1: 1.5 to 3.0, and the total content of nonvolatile carbon in the mixture is 93-97% of the stoichiometric amount of carbon needed to reduce the charge oxides to metals and oxidize carbon to its oxide.