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Recycling method of zinc-containing soot

A technology of soot and metal zinc, which is applied in the field of recycling zinc-containing soot, can solve the problems of difficult utilization and high impurity content of zinc-containing soot, and achieve the effects of maximization, utilization value, and good industrial application prospects

Pending Publication Date: 2022-07-22
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the problems of high impurity content and difficulty in utilization of zinc-containing soot after preliminary enrichment, the present invention provides a method for recycling zinc-containing soot. Zinc oxide, other chlorides and lead oxide and other components with higher saturated vapor pressure are distilled and separated. The distilled components are remelted, and the zinc, lead oxide and chloride salt are recovered after dissolution and sedimentation. The remaining components of the distillation are mixed with ferrosilicon. followed by vacuum thermal reduction to prepare metallic zinc

Method used

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  • Recycling method of zinc-containing soot
  • Recycling method of zinc-containing soot
  • Recycling method of zinc-containing soot

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] Process such as figure 1 shown;

[0057] The zinc-containing soot is pressed into pellets; the zinc-containing soot is the high-zinc dust-removing dust after the iron-making low-zinc soot has been treated by the rotary kiln, and its X-ray diffraction pattern is as follows figure 2 shown; the pressure of pressing into pellets is 200MPa;

[0058] Put the pellets into the vacuum distillation tank, place the vacuum distillation tank in the distillation furnace, and carry out vacuum distillation to obtain crystallization products and distillation residues; the main components of the distillation residues are zinc oxide, silicon oxide and iron oxide, wherein the oxidation The mass content of zinc is 80.5%; the temperature of vacuum distillation is 1000°C, and the time is 2 hours; during vacuum distillation, the pressure in the vacuum distillation tank is controlled to be 10Pa;

[0059] The X-ray diffraction pattern of the distillation residue is shown in image 3shown; th...

Embodiment 2

[0070] The method is the same as in Example 1, except that:

[0071] (1) The pressure of pressing into pellets is 100MPa;

[0072] (2) the mass content of zinc oxide in the distillation residue is 79.3%; the temperature of vacuum distillation is 1100 DEG C, and the time is 1.5 hours; the pressure in the vacuum distillation tank is controlled to be 5Pa during vacuum distillation;

[0073] (3) The crystalline product is heated to 550°C to melt; the solid-liquid ratio of one dissolution is 1:0.5kg / L;

[0074] (4) The solid-liquid ratio of the secondary dissolution is 1:0.8kg / L;

[0075] (5) zinc carbonate is heated to 300 ℃ to decompose to generate zinc oxide; the addition of sodium carbonate is added 30g by every liter of secondary leaching solution;

[0076] (6) The dosage of ferrosilicon alloy powder is 1 times of the theoretical dosage;

[0077] (7) the pressure of pressing into secondary pellets is 100MPa; the temperature of vacuum reduction is 1150°C, and the time is 4 h...

Embodiment 3

[0081] The method is the same as in Example 1, except that:

[0082] (1) The pressure of pressing into pellets is 150MPa;

[0083] (2) the mass content of zinc oxide in the distillation residue is 86.2%; the temperature of vacuum distillation is 950 DEG C, and the time is 8 hours; the pressure in the vacuum distillation tank is controlled to be 20Pa during vacuum distillation;

[0084] (3) The crystalline product is heated to 600°C to melt; the solid-to-liquid ratio of one dissolution is 1:0.2kg / L;

[0085] (4) The solid-liquid ratio of the secondary dissolution is 1:0.5kg / L;

[0086] (5) zinc carbonate is heated to 450 ℃ and decomposes to generate zinc oxide; the addition of sodium carbonate adds 50g by every liter of secondary leaching solution;

[0087] (6) The dosage of ferrosilicon alloy powder is 1.2 times of the theoretical dosage;

[0088] (7) the pressure of pressing into secondary pellets is 150MPa; the temperature of vacuum reduction is 1100°C, and the time is 8 ...

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Abstract

The invention discloses a recycling method of zinc-containing soot. The recycling method comprises the following steps: (1) pressing the zinc-containing soot into pellets; (2) carrying out vacuum distillation to obtain a crystallization product and distillation residues; (3) heating and melting a crystallization product to form a chloride layer and a metal zinc layer; (4) respectively casting to prepare a chloride ingot and a metal zinc ingot; levigating the chloride ingot, adding water for secondary dissolution, and filtering and separating out secondary dissolution slag and secondary dissolution liquid; (5) sodium carbonate is added into the secondary dissolution liquid, and zinc carbonate is generated and separated out; filtering and separating out zinc carbonate and a chlorine salt solution, and heating and decomposing the zinc carbonate to generate zinc oxide; (6) levigating distillation residues, mixing the levigated distillation residues with ferrosilicon alloy powder, and pressing the mixture into secondary pellets; performing vacuum reduction to obtain a secondary crystallization product and reduction residues; and (7) re-melting a secondary crystallization product, and casting to prepare a pure zinc ingot. According to the method, all components of the zinc-containing soot can be separated, recycled and reutilized, the utilization value of the zinc-containing soot can be maximized, and no waste water, waste gas or waste residues are discharged in the whole technological process.

Description

technical field [0001] The invention belongs to the technical field of comprehensive recycling and utilization of waste residues, and particularly relates to a recycling method for zinc-containing soot. Background technique: [0002] Since many ores contain zinc oxide, and zinc oxide is easily reduced and volatilized into the dust during the smelting process, a large amount of zinc-containing dust will be produced in the pyrometallurgical process. A large amount of zinc-containing dust (also known as zinc-containing soot) is produced in the whole process of iron and steel making, and the zinc content in these dust dust varies from 3 to 35%. [0003] At present, since these dusts often contain low zinc content, high-zinc soot is generally obtained by enrichment treatment first, and zinc sulfate is prepared by dissolution of high-zinc soot with sulfuric acid, and then metal zinc is prepared by electrolysis. The rotary kiln method is the most widely used and relatively mature ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/24C22B7/02C22B19/16C22B19/20C22B13/02C22B26/10
CPCC22B1/2406C22B7/02C22B19/16C22B19/20C22B13/025C22B26/10Y02P10/20
Inventor 王耀武董文雄狄跃忠彭建平
Owner NORTHEASTERN UNIV