Comprehensive reclaiming method for pyrite slag

A technology of pyrite slag and recovery method, which is applied in chemical instruments and methods, process efficiency improvement, solid separation and other directions, can solve problems such as limiting the scope of use, and achieve the effects of improving reduction intensity, saving resources and controlling pollution

Inactive Publication Date: 2008-04-09
池煊庆
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limited...

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  • Comprehensive reclaiming method for pyrite slag

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[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. The magnetic separation results are shown in Table 4.

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

[0012] Fe

S

P

As

Cu

Pb

Zn

Au g / t

Ag g / t

SiO 2

CaO

Al 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

2-8

2-5

2-4

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

[0014]

project

Pyrite slag (%)

Magnetic field strength

Concentrate grade (%)

Recovery rate(%)

iron

sulfur

iron

sulfur

iron

sul...

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Abstract

The invention provides a comprehensive recycle method for pyrite cinder. The steps are to, obtain concentrate by conducting a 3-phase wet magnetic separation, mix the concentrate with coke powder, ferric chloride, magnesium chloride and wood calcium sulfonate, granulize and dry to obtain dry pellet mine and ash, deoxidize, chloridize and volatilize the dry pellet mine to obtain qualified metallized and semi-metallized pellet and ash. In the meanwhile, conduct dust collection and water-cool absorption respectively to ash and soot. In the final step, lead, copper and zinc are extracted. The mill run can increase the iron content by 8%-12%, produce qualified metallized and semi-metallized pellet with the iron content of 70%-90%, lead a recycle rate of iron to be no less than 70% and the iron content of coarse tailing to be no greater than 15%, and in the meanwhile, lead the recycle rate of the valuable metals to be greater than 90%, effectively deal with the pollution, turn wastes into values, which is good for sustaining of resources, has important meaning for the countermeasure of the lack of iron resource and the dealing with low grade iron ore. The method is suitable for the comprehensive recycle of pyrite cinder of different grades.

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. Chinese patent 2005100210053 discloses a comprehensive recovery method of pyrite slag. The process steps are magnetic separation, granulation and drying, high-temperature reduction chlorination roasting (temperature less than 1050°C), obtaining qualified iron pellets, and recycling Non-ferrous metals. The qualified iron pellets o...

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Application Information

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IPC IPC(8): C22B7/00B03C1/02C22B1/24C22B5/02C22B3/00C22B3/22C22B3/46C22B1/02
CPCY02P10/20
Inventor 池煊庆
Owner 池煊庆
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