Method for treating sulfur slag

A treatment method and technology for sulfur residues, which are applied in the improvement of process efficiency, photography technology, instruments, etc., can solve the problems of incomplete oxidation and reduce production costs, and achieve complete separation and recovery, reduce production costs, and reduce energy consumption. Effect

Inactive Publication Date: 2013-07-10
吴鋆
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The purpose of the present invention is to provide a treatment method for sulfur slag. The present invention makes full use of the different phase compositions of tin in sulfur slag, and directly recycles most of the metal tin by the melting method, which reduces production costs and contributes to future development. The separation and recovery of tin and copper create good condition

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  • Method for treating sulfur slag

Examples

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no. 1 example

[0025] Present embodiment is the first example of the processing method of sulfur slag of the present invention, comprises the steps:

[0026] (1) Sulfur slag melting: place 4 tons of sulfur slag containing 65% tin and 6% copper in an iron pot with 4 tons of crude tin at 500°C, and carry out melting treatment under the action of a mechanical stirrer , obtain 1 ton of liquid crude tin containing 96% tin and 3 tons of slag containing 48% tin and 8% copper, and the liquid crude tin is directly recovered in the pot;

[0027] (2) High-temperature oxidation: put 3 tons of slag containing 48% tin and 8% copper into a top-blown converter with an inner diameter of 1.8 meters and an inner length of 2.1 meters. Oxygen is sprayed onto the surface of the sulfur slag at a flow rate of 10 cubic meters per minute, and all the sulfur slag is oxidized into dust. The oxidation process takes 90 minutes, consumes 900 cubic meters of industrial oxygen, and collects a total of 3.2 tons of copper oxi...

no. 2 example

[0032] Present embodiment is the second example of the treatment method of sulfur slag of the present invention, comprises the steps:

[0033] (1) Sulfur slag smelting: put 4 tons of sulfur slag containing 70% tin and 10% copper in an iron pot with 4 tons of crude tin at 600°C, under the action of a rotary arm type centrifugal iron remover , Carry out smelting treatment, obtain 1.35 tons of liquid crude tin containing 97% tin and 2.65 tons of molten slag containing 56.2% tin and 15.1% copper, the liquid crude tin is directly recycled in the pot;

[0034](2) High-temperature oxidation: put 2.65 tons of slag containing 56.2% tin and 15.1% copper into a top-blown converter with an inner diameter of 1.8 meters and an inner length of 2.1 meters. The industrial oxygen is sprayed onto the surface of the sulfur slag at a flow rate of 10 cubic meters per minute, and the sulfur slag is completely oxidized into dust. The oxidation process takes 100 minutes to consume 1,000 cubic meters o...

no. 3 example

[0039] Present embodiment is the 3rd example of the treatment method of sulfur slag of the present invention, comprises the steps:

[0040] (1) Sulfur slag melting: put 4 tons of sulfur slag containing 73% tin and 15% copper in an iron pot with 4 tons of crude tin at 700°C, and under the action of a bridge-type centrifugal iron remover, Carry out smelting treatment to obtain 1.4 tons of liquid crude tin containing 97.1% tin and 2.6 tons of molten slag containing 60% tin and 23% copper, and the liquid crude tin is directly recovered in the pot;

[0041] (2) High-temperature oxidation: put 2.6 tons of slag containing 60% tin and 23% copper into a top-blown converter with an inner diameter of 1.8 meters and an inner length of 2.1 meters. The industrial oxygen is sprayed onto the surface of the sulfur slag at a flow rate of 10 cubic meters per minute, and the sulfur slag is completely oxidized into dust. The oxidation process takes 110 minutes, consumes 1,100 cubic meters of indus...

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Abstract

A method for treating sulfur slag comprises the following steps of: performing liquation treatment on sulfur slag containing 65-73% of tin and 6-15% of copper on the crude tin liquid in an iron pot in the range of 500-700 DEG C, thereby obtaining liquid crude tin and liquation slag containing 48-60% of tin and 8-23% of copper, recovering the liquid crude tin in the pot and completely oxidizing the liquation slag by industrial oxygen at a high temperature into mixed dust of copper oxide and tin dioxide, leaching the mixed dust for 2-3 hours under conditions of normal temperature and normal pressure, 70-120 g/L initial acid, and then filtering; reducing and smelting the filter residue to obtain crude tin, and concentrating, crystallizing and separating the filtrate to produce copper sulfate pentahydrate or performing electrolysis to produce electrolytic copper; and then returning the crystallization mother liquor or the liquid after electrolysis to the leaching process for liquid preparation. The method provided by the invention is capable of directly recovering most metal tin and realizing recovery of tin and copper in the sulfur slag without generating wastewater, waste gas and waste residues.

Description

technical field [0001] The invention relates to the field of nonferrous metal smelting, in particular to a method for treating sulfur slag. Background technique [0002] After the tin concentrate is boiled and roasted to remove most of the sulfur and arsenic, the tin calcine is produced; the tin calcine is mixed with an appropriate proportion of reduced coal, and the reduction smelting is carried out in a reverberatory furnace, an electric furnace or an Ausmelt furnace to produce Out of crude tin. In the reduction smelting process, the copper in the tin calcine is reduced to metallic copper and dissolved in the liquid crude tin in the reverberatory furnace, electric furnace or Ausmelt furnace; during the refining process of the liquid crude tin, sulfur is added to remove Copper, the slag containing 65-73% tin and 6-15% copper produced during copper removal, this slag is called sulfur slag, sometimes also written as S slag. The main phase components of sulfur slag are metal...

Claims

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Application Information

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IPC IPC(8): C22B25/06C22B15/00C22B9/02C25C1/12
CPCY02P10/20
Inventor 吴鋆
Owner 吴鋆
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