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Method for comprehensive utilization of iron and sulfur in tailing containing iron and sulfur

A technology for pyrite tailings and iron tailings, which is applied in the field of comprehensive utilization of iron and sulfur, can solve the problems of different iron-containing grades of sulfuric acid slag, low technical indicators, complex technologies, etc., and achieves great practicability, economic benefits, and technical indicators. High, simple process effect

Inactive Publication Date: 2010-07-07
厦门紫金矿冶技术有限公司
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  • Summary
  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

[0005] 1. The grade of iron in sulfuric acid slag varies and fluctuates greatly. Even in the same production area and the same acid plant, due to the dispersion of operating conditions and mine resources, the grade of iron cannot be kept stable, and the grade even decreases year by year. Difficulty in exploiting the persistence of sulfuric acid slag
[0006] 2. In addition to iron, there are some elements harmful to steel quality in sulfuric acid slag
These harmful elements have been greatly reduced with the advancement of mining and dressing technology, but there are still some harmful elements, such as copper, which cannot be removed
[0007] 3. The sulfur content of sulfuric acid slag is generally higher than the iron ore required for blast furnace smelting, which is the biggest obstacle to smelting qualified pig iron
This method is simple and practical, with less investment and quick start. The disadvantage is that the quality is not stable. SO 2 The flue gas pollution is serious, and it has become a situation of secondary pollution due to the utilization of three wastes
To solve the flue gas recovery treatment or high-altitude emission, the investment is large and the technology is also complicated. This is a problem that must be solved sooner or later for the iron-making industry to use a large amount of sulfuric acid slag.
[0018] In summary, the existing pyrite utilization technology has the problems of low utilization efficiency, low technical indicators and poor economic benefits

Method used

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  • Method for comprehensive utilization of iron and sulfur in tailing containing iron and sulfur
  • Method for comprehensive utilization of iron and sulfur in tailing containing iron and sulfur
  • Method for comprehensive utilization of iron and sulfur in tailing containing iron and sulfur

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Experimental program
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Effect test

Embodiment 1

[0048] Such as figure 1 , figure 2 As shown in the figure, the pyrite tailings of copper and zinc flotation in a copper mine in Ashele are taken. The metal minerals in the ore are mainly pyrite, followed by chalcopyrite and sphalerite, and the gangue minerals are mainly quartz, clinoid Feldspar, mica, calcite, dolomite, chlorite, etc. The contents of iron, sulfur and copper in the ore are 27.98% iron, 29.02% sulfur and 0.18% copper respectively.

[0049] (1) rough selection

[0050] The pyrite tailings with a sulfur grade of 29% are prepared with water to form a pulp with a concentration of about 30% by weight and enter the roughing tank, adding sulfuric acid with a concentration of 20% by weight to keep the pH value of the pulp at 6; Add 1000 grams of sodium silicate to the tailings and stir well; then add 50 grams of butyl xanthate per ton of tailings and stir well; then add 60 grams of terpineol oil per ton of tailings and stir well; The foam layer in the tank is kept ...

Embodiment 2

[0066] Take pyrite tailings from copper and zinc flotation in a copper mine in Qinghai. The metal minerals in the ore are mainly pyrite, followed by magnetite and chalcopyrite. The gangue minerals are mainly calcite, dolomite and chlorite , quartz, etc. The contents of iron, sulfur and copper in the ore are 40.7% iron, 38.5% sulfur and 0.87% copper.

[0067] (1) rough selection

[0068] The pyrite tailings with a sulfur grade of 38.5% are prepared with water to make a slurry with a concentration of about 40% by weight and enter the roughing tank, and add sulfuric acid with a concentration of 10% by weight to keep the pH value of the slurry at 4.5; Add 1,000 grams of sodium hexametaphosphate to the tailings, and stir well; add 100 grams of butylamine black medicine to each ton of tailings, and stir well; then add 80 grams of No. 2 flotation oil to each ton of tailings, and stir well; Keep the foam layer in the flotation tank at a thickness of 5-50mm, and float for 10 minutes;...

Embodiment 3

[0080] The pyrite tailings of copper-zinc flotation in a copper mine in Qinghai are taken. The metal minerals in the ore are mainly pyrite, followed by chalcopyrite and sphalerite. The main gangue minerals are: quartz, plagioclase, mica, Calcite, dolomite, chlorite, etc. The contents of iron, sulfur and copper in the ore are 18.86% iron, 9.92% sulfur and 0.08% copper respectively.

[0081] (1) rough selection

[0082] The pyrite tailings with a sulfur grade of 9.92% are prepared with water to form a pulp with a concentration of about 20% by weight and enter the roughing tank, adding sulfuric acid with a concentration of 5% by weight to keep the pH value of the pulp at 8.5; Add 200 grams of sodium silicate to the tailings and stir well; add 20 grams of PAC to each ton of tailings and stir well; Flotation for 5 minutes at a thickness of 5-50 mm; the foam product is rougher pyrite concentrate, and the product in the tank is rougher tailings;

[0083] (2) Scanning

[0084] Add...

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Abstract

The invention discloses a method for comprehensive utilization of iron and sulfur in tailing containing iron and sulfur, comprising the following steps: carrying out floatation on and decontaminating the iron and sulfur tailing and enriching the iron and sulfur to obtain an iron and sulfur concentrated ore; carrying out oxidizing roasting on the iron and sulfur concentrated ore to obtain calcine and flue gas; carrying out sulfuric acid pickling and decontamination on the calcine to obtain iron ore concentrate; absorbing the flue gas by an acid production device for producing sulfuric acid; carrying out reduction roasting on the iron ore concentrate to obtain metalized pellet. In the invention, the method for comprehensive utilization of iron and sulfur in tailing containing iron and sulfur can be employed for comprehensive utilization of iron and sulfur in the iron and sulfur tailing; while sulfuric acid is produced, high-purity reduced iron with a metallization rate of more than 95% and a metallic iron content of more than 90% can be obtained. The method of the invention features simple technological processes, high technical specifications, low costs and great practicability and economic benefits.

Description

technical field [0001] The invention relates to a method for comprehensively utilizing iron-sulfur from tailings, in particular to a method for comprehensively utilizing iron-sulfur from sulfur-containing iron tailings. Background technique [0002] According to the data, most manufacturers currently discard the tailings of flotation copper-zinc or other sulfur-containing minerals, and sell the tailings with high sulfur content to acid manufacturers at a low price. Due to the high impurity content in the tailings, sulfur concentrate The ore quality is impure, which makes it difficult to fully use the sulfuric acid slag. [0003] my country's chemical companies discharge nearly 10 million tons of sulfuric acid slag every year, except for about 15% which are used in building materials, metallurgy and other industries, and the rest are discharged as "three wastes", occupying farmland, polluting rivers, lakes and seas, that is, endangering the environment and causing national re...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/02C22B3/08B03D1/02B03D1/012B03D1/004B03D1/002B03D103/02B03D101/06B03D101/04B03D101/02
CPCY02P10/20
Inventor 陈景河李黎婷刘升明马宠张卿张保丰蔡创开董博文张波王中溪马龙赖伟强
Owner 厦门紫金矿冶技术有限公司
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