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Method for treating nickel smelting furnace slag

A technology of slag and rotary hearth furnace, which is applied in the field of processing nickel smelting slag, which can solve the problems of fluctuating product quality, complicated operation, and lengthy process, and achieve the effects of shortening the smelting cycle, low energy consumption, and reducing costs

Inactive Publication Date: 2014-03-12
JINCHUAN GROUP LIMITED
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0016] The purpose of the present invention is to address the deficiencies in the above-mentioned prior art, provide a method that can effectively solve the problems of lengthy process, complicated operation, and easy fluctuation of product quality, reduce production costs, save energy, and can provide molten iron for steelmaking. It can also provide secondary slag for the development and production of slag powder, foam ceramics, aerated concrete blocks and other products, which realizes the goal of maximizing resource utilization and zero discharge of solid waste. The method of treating nickel smelting slag

Method used

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  • Method for treating nickel smelting furnace slag
  • Method for treating nickel smelting furnace slag
  • Method for treating nickel smelting furnace slag

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Experimental program
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Effect test

Embodiment 1

[0050] Operation steps of the present invention are:

[0051] Ingredients mixing: 3㎜Nickel industry smelting slag: 1 # Coal powder: limestone powder: bentonite = 64.5: 19.4: 12.9: 3.2, mix the above crushed and ground materials in proportion;

[0052] Ball briquetting: Add the above-mentioned raw materials prepared in proportion to the mixer, and after mixing evenly, use a double-roller briquetting machine to press it into pellets. The size of the pellets is 40×㎜25㎜×20㎜;

[0053] Drying: Dry the pressed pellets in an electric blast drying oven at 200°C for 3 hours, and the compressive strength after drying is greater than 300N;

[0054] Direct reduction in rotary hearth furnace: ① Preheating: Put the dried carbon-containing pellets into the preheating section of the rotary hearth furnace for preheating. The preheating temperature is 900°C and the preheating time is 25 minutes;

[0055] ②Direct reduction: The preheated carbon-containing pellets are reduced in the reduction se...

Embodiment 2

[0058] Operation steps of the present invention are:

[0059] Ingredients mixing: 1㎜Nickel industry smelting slag: 2 # Coal powder: limestone powder: NCP: bentonite = 69.4: 16.7: 6.9: 3.5: 3.5, mix the above crushed and ground materials in proportion;

[0060] Ball briquetting: Add the above-mentioned raw materials prepared in proportion to the mixer, and after mixing evenly, use a double-roller briquetting machine to press it into pellets. The size of the pellets is 40×㎜25㎜×20㎜;

[0061] Drying: Dry the pressed pellets in an electric blast drying oven at 200°C for 3 hours, and the compressive strength after drying is greater than 500N;

[0062] Direct reduction in rotary hearth furnace: ① Preheating: Put the dried carbon-containing pellets into the rotary hearth furnace and preheat in the preheating section. The preheating temperature is 900°C and the preheating time is 25 minutes;

[0063]② Reduction: The preheated carbon-containing pellets are reduced in the reduction sec...

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Abstract

The invention method provides a method for treating nickel smelting furnace slag and relates to a method for treating nickel smelting furnace slag by a rotary hearth furnace reduction-gas furnace melting separation combined process. The method is characterized by sequentially comprising the following process steps: (1) adding a reducing agent, a fusing agent and an adhesive into the nickel smelting furnace slag and mixing; (2) pressing into pellets; (3) drying the pressed pellets; (4) charging the dried carbon-containing pellets into a preheating section of a rotary hearth furnace and preheating; (5) reducing the carbon-containing pellets in a reducing section of the rotary hearth furnace to obtain thermal-state metallized pellets; and (6) adding the hot pellets into the gas furnace for melting separation to realize final reduction and scrap iron melting separation. By the method, valuable elements in the nickel smelting furnace slag can be comprehensively recovered, continuity of a preparation process is realized, molten iron for steel-making can be provided, and secondary slag for developing and producing products such as slag micropowder, foamed ceramic and aerated concrete blocks also can be provided, and zero emission of solid wastes is realized.

Description

[0001] technical field [0002] A method for treating nickel smelting slag relates to a method for treating nickel smelting slag by adopting a rotary hearth furnace reduction-gas furnace melting separation combined process. Background technique [0003] In the smelting and production of non-ferrous metals, a large amount of smelting slag and beneficiation tailings will be produced. The smelting slag is usually disposed of by stockpiling. The stockpiled smelting slag contains metals such as iron, nickel, copper and cobalt, and has high recycling value. [0004] At present, many domestic enterprises have problems such as extensive management of smelting waste residues, serious environmental pollution, and large resource consumption and waste. This point highlights that the effective recovery and comprehensive utilization of resources have not been realized. Since the 1970s, in-depth research on the comprehensive utilization of smelting slag has been carried out, and various ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21B13/14C22B1/242
Inventor 李娟程永红李维舟马晓东芦越刚樊昱马永峰李祖如王乃弘高晓婷邓民晖董政武
Owner JINCHUAN GROUP LIMITED
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