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Method for rapidly reducing copper slags to produce iron-copper alloys in kiln in reducing atmosphere

An iron-copper alloy and kiln technology, which is applied in the field of comprehensive utilization of resources, can solve the problems that do not involve the reuse of weakly reducing tail gas, etc., and achieve the effects of shortening the reduction time, reducing costs and improving efficiency

Active Publication Date: 2012-10-10
TONGLING NON FERROUS METAL GROUP CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This patent adopts the chain plate machine-shaft furnace process, and carries out weak reduction at 900℃~1000℃. The raw material used is also low-grade iron ore with iron oxide as the main iron-containing mineral, and does not involve the control of iron silicate. Restoration technology
In addition, this technology does not involve the technical problem of reusing weakly reducing tail gas

Method used

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  • Method for rapidly reducing copper slags to produce iron-copper alloys in kiln in reducing atmosphere

Examples

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Effect test

Embodiment 1

[0040] The process flow of this embodiment consists of four parts: kiln control, batching, agglomeration, deep reduction roasting and crushing wet grinding-wet magnetic separation.

[0041] In order to control the strong reducing atmosphere inside the kiln, the air supply during the kiln combustion is 50% of the total air required for the complete combustion of the supplied fuel. The above-mentioned air required for complete combustion refers to the conversion of 100% of various carbon-containing compounds in the fuel into CO 2 The amount of theoretical calculations required.

[0042] In order to maintain a strong reducing atmosphere in the kiln and achieve the high temperature of 1350°C required for rapid and deep reduction in the kiln, both fuel gas and air need to be preheated at high temperature. The fuel gas used is natural gas. The preheating of natural gas adopts tubular heat exchanger to exchange heat with the high-temperature waste gas discharged from the deep reduc...

Embodiment 2

[0046] The proportion of copper slag, reducing agent, additive and binder used in the ingredients of this embodiment is: copper slag: reducing agent: additive: binder = 100:20:5.4:5. The main chemical components of the copper smelting slag used are: TFe: 41.15%, SiO 2 : 34.85%, Al 2 o 3 : 3.80%, MgO: 3.58%, CaO: 1.59%, Cu: 0.31%. The reducing agent used is lignite, the additive used is lime, and the binder used is sodium carboxymethylcellulose (CMC).

[0047] Mix and grind the above-mentioned copper slag, lignite and lime in proportion to the remaining 20% ​​of the 200 mesh sieve, add binder and water accounting for 9% of the dry mass of the whole material, and use a briquetting machine to make a uniform diameter and height after mixing. It is a small cylindrical briquette of 20mm, which is laid flat on the bottom of the kiln after drying. The thickness of the material layer is 30mm. The reduction temperature of the material layer is 1350°C, and the reduction time is 40mi...

Embodiment 3

[0049] The proportion of copper slag, reducing agent, additive and binder used in the ingredients of this embodiment is, copper slag: reducing agent: additive: binder = 100:14:5.4:5. The main chemical composition of the copper slag used is: TFe 41.15%, SiO 2 34.85%, Al 2 o 3 3.80%, MgO 3.58%, CaO 1.59%, Cu 0.31%. The reducing agent used is coke powder, the additive used is lime, and the binder used is sodium carboxymethylcellulose (CMC).

[0050] Mix and grind the above-mentioned copper slag, coke powder and lime in proportion to the remaining 20% ​​of the 200 mesh sieve, add binder and water accounting for 10% of the dry mass of the whole material, and use a briquetting machine to make the diameter and height All small cylindrical briquettes of 20mm are laid flat on the bottom of the kiln after drying. The thickness of the material layer is 30mm. The reduction temperature of the material layer is 1350°C, and the reduction time is 20min. The reduced material blocks are co...

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Abstract

A method for rapidly reducing copper slags to produce iron-copper alloys in a kiln in a reducing atmosphere is characterized by including the steps: proportionally mixing the copper slags, reducing agents and additives, crushing or levigating the mixture to 200 meshes to obtain 20%-40% of residues on sieve; doping agglomerants and water occupying 5-20% of all materials on a dry mass basis, uniformly mixing, producing the uniformly mixed mixture to pellets with the diameters ranging from 15mm to 30mm and small cylindrical briquettes with all the heights ranging from 15mm to 30mm by a pellet press or a briquetting machine, and drying the pellets or small cylindrical briquettes; flatly laying the dried pellets or small cylindrical briquettes at the bottom of the kiln, wherein the material layer thickness ranges from 20mm to 45mm, the material layer reducing temperature ranges from 1250 DEG C to 1450 DEG C, and the reducing time is 10-40min; and subjecting the reduced pellets or the briquettes to cooling, crushing, wet grinding and wet separation so that iron-copper alloy powder with the iron recovery rate of 85%-99% is obtained. According to the method, iron in a great quantity of silicate iron in the copper slags, which cannot be separated out by the traditional technology, is extracted and turns into the iron-copper alloy micro powder with high added value so that iron and copper in the copper slags are extracted and used simultaneously, and physical and chemical heat energy in strong reducing waste gas can be completely recovered during rapid depth reduction.

Description

[0001] technical background [0002] The invention relates to the field of comprehensive utilization of resources, and provides a method for rapidly and deeply reducing copper slag in a reducing atmosphere kiln to produce iron-copper alloy micropowder. [0003] Copper smelting slag is referred to as copper slag. my country's current annual output of copper slag is about 10 million tons. Some enterprises re-select the residual copper, and some enterprises use water quenching process to make it difficult to select the residual copper in the copper slag. Even the copper slag that has been treated with copper selection still has more than 0.1% of metallic copper, while the content of metallic copper in the copper slag that has not been treated with copper selection can be as high as 2%. Therefore, about 100,000 tons of metal copper are wasted every year in the national copper slag. In addition to the high value of residual metal copper, copper slag often contains 30% to 50% iron...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/04C22B15/00C21B13/00B22F9/22
CPCY02P10/20
Inventor 倪文陈锦安王红玉许冬占寿罡徐光泽申其新张玉燕李克庆
Owner TONGLING NON FERROUS METAL GROUP CORP
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