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Method for recovering valuable metals from nickel-copper molten slag through selective reduction

A valuable metal and molten slag technology, which is applied to the selective reduction and recovery of valuable metals in nickel-copper molten slag, comprehensive utilization of smelting molten slag, and step-by-step selective reduction of high-temperature nickel-copper smelting molten slag, which can solve the problem of crude iron. The problems of high copper content in products and difficult positioning of subsequent products have achieved the effect of realizing economy, saving costs, and broadening the application field of the market.

Inactive Publication Date: 2013-01-02
JINCHUAN GROUP LIMITED
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a kind of nickel that can effectively solve the problem of high copper content in crude iron products and difficult positioning of subsequent products, reduce production costs and broaden the application field of products in view of the deficiencies in the prior art. The method of selective reduction and recovery of valuable metals in copper molten slag can truly achieve the goal of zero discharge of slag

Method used

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  • Method for recovering valuable metals from nickel-copper molten slag through selective reduction
  • Method for recovering valuable metals from nickel-copper molten slag through selective reduction
  • Method for recovering valuable metals from nickel-copper molten slag through selective reduction

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Effect test

Embodiment 1

[0019] The chemical composition of the raw material nickel molten slag that the inventive method adopts is as shown in table 1.

[0020] Table 1 Chemical composition of nickel molten slag (%)

[0021]

[0022] (1) Selective reduction: Add 500kg of nickel-copper smelting slag directly into the reduction furnace in a molten state at a high temperature of 1200°C, add 10kg of reducing agent lignite lump coal and 50kg of flux limestone respectively, and carry out nickel melting slag at 1400°C selective reduction smelting;

[0023] (2) Deep reduction: When 500kg of intermediate nickel molten slag is at 1500°C, 100kg of reducing agent lignite lump coal and 125kg of flux limestone are respectively added to carry out deep reduction smelting of intermediate nickel molten slag. The slag components after selective reduction smelting and deep reduction smelting of nickel molten slag are shown in Table 2 and Table 3, respectively. The composition of reduced crude iron is shown in Table...

Embodiment 2

[0031] The chemical composition of the melted raw material nickel used in the method of the present invention is shown in Table 5.

[0032] Table 5 Chemical composition of nickel molten slag (%)

[0033]

[0034] (1) Selective reduction: Put 500kg of nickel-copper smelting slag directly into the reduction furnace at a high temperature of 1350°C, add 20kg of reducing agent block anthracite, and 75kg of flux lime powder, and melt the molten slag at 1450°C for nickel melting Selective reduction smelting of slag;

[0035] (2) Deep reduction: When 500kg of intermediate nickel molten slag is at 1450°C, 125kg of reducing agent block anthracite and 175kg of flux lime powder are respectively added to carry out deep reduction smelting of intermediate nickel molten slag.

[0036] The slag components after selective reduction smelting and deep reduction smelting of nickel molten slag are shown in Table 6 and Table 7, respectively. The composition of reduced crude iron is shown in Tab...

Embodiment 3

[0044] The chemical composition of the melted raw material nickel used in the method of the present invention is shown in Table 9.

[0045] Table 9 Chemical composition of nickel molten slag (%)

[0046]

[0047] (1) Selective reduction: Put 500kg of nickel-copper smelting slag directly into the reduction furnace at a high temperature of 1300°C, add 30kg of reducing agent powdered bituminous coal, and 100kg of flux powdered limestone respectively, and carry out nickel slag melting at 1500°C selective reduction smelting;

[0048] (2) Deep reduction: When 500kg of intermediate nickel molten slag is at 1600°C, 150kg of reducing agent block bituminous coal and 200kg of flux limestone are respectively added to carry out deep reduction smelting of nickel molten slag.

[0049] The slag components after selective reduction smelting and deep reduction smelting of nickel molten slag are shown in Table 10 and Table 11, respectively. The composition of reduced crude iron is shown in ...

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Abstract

The invention belongs to the technical field of solid waste comprehensive utilization, and relates to a method for recovering valuable metals from nickel-copper molten slag through selective reduction. A process comprises the steps that: nickel-copper smelting slag is subjected to selective reduction under a high-temperature molten slag state, such that nickel, cobalt, and copper valuable metals in the slag can be completely reduced; the reduction of a small amount of iron is controlled, such that an intermediate alloy rich in nickel, cobalt, and copper is produced; most of the rest molten slag exists in a form of iron silicate; a solvent and a reducing agent are added, such that iron in the molten slag is completely reduced, and crude iron containing trace nickel, cobalt, and copper can be produced; and crude iron is adopted as an iron alloy and steelmaking raw material. The method provided by the invention has the advantages that a high-temperature nickel-copper smelting molten slag stepped selective reduction process is adopted, and nickel-copper smelting slag is utilized under a molten state, such that slag secondary heating cost is saved, valuable metal graded utilization is realized, product market application field is widened, and solid waste economical and effective utilization is realized.

Description

technical field [0001] The invention relates to a comprehensive utilization method of smelting molten slag, in particular to a step-by-step selective reduction process for high-temperature nickel-copper smelting molten slag, which belongs to the technical field of comprehensive utilization of solid waste, and specifically relates to a method for selective reduction and recovery of nickel-copper molten slag. valence metal method. Background technique [0002] At present, in the non-ferrous metal nickel smelting process in my country, millions of tons of nickel smelting slag are discharged every year. The content of FeO in the slag is more than 50%, and most of the ferrous oxide is 2FeO·SiO 2 Exists in the form of Fe 3 o 4 form exists. In addition, it also contains 0.1% to 0.5% nickel, 0.2% to 0.4% copper and 0.1% to 0.3% cobalt. These non-ferrous metals are important alloying elements and have important application value. But now most of these slags are piled up on the su...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/04C22B15/00C22B23/00
CPCY02P10/20
Inventor 马永峰聂文斌周民王树清樊昱张喜庆张鹏邓民晖董政武芦越刚胡建新马晓东王玉芳
Owner JINCHUAN GROUP LIMITED
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