A dezincing method is provided that can remove zinc by designing the heating temperature for a galvanized steel sheet in consideration of the oxidation of zinc. In a dezincing method for removing zinc from a galvanized steel sheet stored in a container, the temperature and the oxygen partial pressure inside the container satisfy relationships of expressions (1) to (3) below:

[00001]$\begin{array}{cc}T17.6\log \left(P_{O2}\right)+1031& \left(1\right)\end{array}$$\begin{array}{cc}700T1200& \left(2\right)\end{array}$$\begin{array}{cc}{P}_{O2}10.13.& \left(3\right)\end{array}$

In expressions (1) to (3), T is the temperature ( C.) inside the container, and P.sub.O2 is the oxygen partial pressure (kPa) inside the container.

A dezincing method is provided that can remove zinc by designing the heating temperature for a galvanized steel sheet in consideration of the oxidation of zinc. In a dezincing method for removing zinc from a galvanized steel sheet stored in a container, the temperature and the oxygen partial pressure inside the container satisfy relationships of expressions (1) to (3) below:

[00001]$\begin{array}{cc}T17.6\log \left(P_{O2}\right)+1031& \left(1\right)\end{array}$$\begin{array}{cc}700T1200& \left(2\right)\end{array}$$\begin{array}{cc}{P}_{O2}10.13.& \left(3\right)\end{array}$

In expressions (1) to (3), T is the temperature ( C.) inside the container, and P.sub.O2 is the oxygen partial pressure (kPa) inside the container.

A method for processing a source material containing zinc ferrite that includes the following step: B. Partially reduce source material using a reducing gas containing hydrogen to form a reduced material; where step B is carried out at below 1000 C. using a reducing gas containing at least 0.25% (by vol.) and up to 70% (by vol.) hydrogen in a carrier gas.

A method for processing a source material containing zinc ferrite that includes the following step: B. Partially reduce source material using a reducing gas containing hydrogen to form a reduced material; where step B is carried out at below 1000 C. using a reducing gas containing at least 0.25% (by vol.) and up to 70% (by vol.) hydrogen in a carrier gas.

A process, for the selective heavy metal removal from iron- and/or steelmaking flue dust, including steps of: preparing a feedstock (FS) by blending or mixing a chloride precursor material (CPM) and ironmaking and/or steelmaking flue dust including heavy metals (ISFD), the heavy metals including Pb and Zn and optionally Cd; in a first reaction step in a first reactor reacting the CPM with the ISFD by thermal treatment of the FS at a temperature in a range of 700 C. to 950 C. removing at least 70 wt. % of Pb from the ISFD; in a subsequent second reaction step in a second reactor further reacting the CPM with the ISFD by thermal treatment of the feedstock FS at a temperature in a range of 850 C. to 1200 C.; and obtaining a solid material after the second reaction step. The invention also relates to a plant implementing the process.

A process, for the selective heavy metal removal from iron- and/or steelmaking flue dust, including steps of: preparing a feedstock (FS) by blending or mixing a chloride precursor material (CPM) and ironmaking and/or steelmaking flue dust including heavy metals (ISFD), the heavy metals including Pb and Zn and optionally Cd; in a first reaction step in a first reactor reacting the CPM with the ISFD by thermal treatment of the FS at a temperature in a range of 700 C. to 950 C. removing at least 70 wt. % of Pb from the ISFD; in a subsequent second reaction step in a second reactor further reacting the CPM with the ISFD by thermal treatment of the feedstock FS at a temperature in a range of 850 C. to 1200 C.; and obtaining a solid material after the second reaction step. The invention also relates to a plant implementing the process.

A method for recycling zinc (Zn), wherein the method comprises the following steps: providing a feed composition; adding the feed composition to a rotary oven; heating the added feed composition for producing a first liquid molten metal phase and a first supernatant dross; adding aluminum (Al) to the first liquid molten metal phase, wherein a second supernatant dross and a second liquid molten metal phase are formed; adding at least one flux to the second liquid molten metal phase, followed by at least one segregation step in which the second liquid molten metal phase is removed from the rotary oven; casting the second liquid molten metal phase, or adding the removed second liquid molten metal phase to a casting furnace; casting the second liquid molten metal phase from the casting furnace; wherein the method further comprises the steps of: removing the second supernatant dross from the rotary oven; subjecting the removed second supernatant dross to at least one crushing step and at least one sorting step for separating at least one zinc fraction and at least one zinc oxide fraction from the second supernatant dross; and using the at least one zinc fraction for contributing to provide the feed composition.

A method for recycling zinc (Zn), wherein the method comprises the following steps: providing a feed composition; adding the feed composition to a rotary oven; heating the added feed composition for producing a first liquid molten metal phase and a first supernatant dross; adding aluminum (Al) to the first liquid molten metal phase, wherein a second supernatant dross and a second liquid molten metal phase are formed; adding at least one flux to the second liquid molten metal phase, followed by at least one segregation step in which the second liquid molten metal phase is removed from the rotary oven; casting the second liquid molten metal phase, or adding the removed second liquid molten metal phase to a casting furnace; casting the second liquid molten metal phase from the casting furnace; wherein the method further comprises the steps of: removing the second supernatant dross from the rotary oven; subjecting the removed second supernatant dross to at least one crushing step and at least one sorting step for separating at least one zinc fraction and at least one zinc oxide fraction from the second supernatant dross; and using the at least one zinc fraction for contributing to provide the feed composition.