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Comprehensive recovery method of pyrite slag

A technology of pyrite slag and recovery method is applied in the direction of recycling technology, process efficiency improvement, solid separation, etc., and can solve the problems that non-ferrous metal impurities cannot be removed, valuable metals are not recovered, and energy consumption is high, To achieve the effect of being beneficial to resource regeneration, alleviating the lack of iron resources, and controlling pollution

Inactive Publication Date: 2008-01-30
池煊庆
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The main problem of this method is that the magnetic field strength of the strong magnetic process of magnetic selection reaches 12,000-20,000 gauss, which requires large investment and high energy consumption. Valuable metals are not recovered, and non-ferrous metal impurities cannot be removed.

Method used

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  • Comprehensive recovery method of pyrite slag

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Experimental program
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Effect test

Embodiment Construction

[0010] The raw material of Examples 1-3 is pyrite slag from Zizhong, Sichuan, and its chemical composition is shown in Table 1. The results after overflow ball milling and wet magnetic separation are shown in Table 2. The results of reduction chlorination volatilization and comprehensive recovery are shown in Table 3.

[0011] Table 1: Main chemical composition of pyrite slag (%)

[0012] Fe

S

P

A 5

Cu

Pb

Zn

Au g / t

Ag g / t

SiO 2

CaO

A1 2 o 3

34-55

1-3

0.05

0.1-0.2

0.2

1-2

0.5-2

0.5-1

20-50

2-4

2-5

2-4

[0013] Table 2: Results of wet magnetic separation of pyrite slag

[0014]

project

pyrite cinder

(%)

Magnetic field strength

Concentrate grade (%)

Recovery rate(%)

iron

sulfur

iron

sulfur

iron

sulfur

example 1

45.50

0.52

Medium magnetic, weak magnet...

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Abstract

A comprehensive recovery method for the slag of troilite includes such steps as three-stage wet-type magnetic dressing to obtain the concentrate with 10-15% of iron content, filter, mixing with coke powder, iron chloride, magnesium chloride and urea-aldehyde resin, granulating, drying to obtain palletized ore and dust, reducing and chlorinating to obtain qualified palletized ore with iron content more than 60%, collecting dust and fume ash, water cooling and extracting Pb, Cu and Zn.

Description

technical field [0001] The invention relates to a recovery method of waste slag, in particular to a comprehensive recovery method of pyrite slag. Background technique [0002] Pyrite is one of the raw materials for sulfuric acid production. After desulfurization and acid production, the slag is obtained. The iron content is generally between 34% and 55%. The impurities are generally sulfur, phosphorus, arsenic, copper, lead, zinc, gold, and silver. . Among them, a small part can be used as iron-making raw materials, and is mainly used as raw materials for firing cement at a low price. At the same time, the slag will also pollute the environment. At present, the recovery method of pyrite slag mainly includes the Japanese "photosynthesis" method, which requires the iron content of the slag to be higher than 55% and the sulfur content to be lower than 1%. And the process is complicated, the equipment is complicated, the chlorinating agent is more expensive, and the investmen...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21B3/06B03B1/00C22B1/242C22B3/00
CPCY02P10/20Y02W30/50
Inventor 池煊庆
Owner 池煊庆