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Method for recovering lead chloride from sintered ashes and preparing lead monoxide

A technology of lead monoxide and sintered ash, which is applied in the direction of lead monoxide, lead oxide, lead halide, etc., can solve the problems of nodulation in the furnace, reduction of the strength of the blast furnace charge, and cracking of the furnace wall, so as to achieve simple process flow and improve use The effect of life and reducing the shutdown rate

Active Publication Date: 2012-01-11
HUNAN VALIN XIANGTAN IRON & STEEL CO LTD +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this method realizes the recycling of sinter ash to a certain extent, the heavy metal elements such as lead and copper contained in it will enter the ironmaking blast furnace with iron ore, resulting in continuous enrichment in the blast furnace, which seriously affects the blast furnace. normal production
It is specifically reflected in the following three aspects: first, it causes cracks in the furnace wall of the ironmaking blast furnace and nodules in the furnace, resulting in shutdown or overhaul of the blast furnace; second, the reduction of the blast furnace charge strength leads to fluctuations in the blast furnace condition and unstable production; Third, blockage of the blast furnace gas dust removal system pipeline affects the flexibility of the gas shut-off valve and makes it difficult to ignite the blast furnace

Method used

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  • Method for recovering lead chloride from sintered ashes and preparing lead monoxide
  • Method for recovering lead chloride from sintered ashes and preparing lead monoxide
  • Method for recovering lead chloride from sintered ashes and preparing lead monoxide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Weigh 600g of electric dust removal ash from the sintering machine head, and its chemical composition analysis is shown in Table 1, Item 4.

[0021] Table 1 Example 1 Sample chemical composition

[0022]

[0023] The sintered ash was added to 6L aqueous solution containing 2g of dispersant and stirred to prepare a sintered ash suspension. The suspension was separated by a two-stage gradient magnetic separation of "weak magnetic → strong magnetic", and the tail slurry was filtered and dried to obtain 294 g of iron content. 57.7% of iron ore concentrate with lead content of 0.92% and 244.5g of tailings with lead content of 18.46%.

[0024] The tail sludge after the magnetic separation is divided into 3 leaching. First, add 1 / 3 of the tail sludge to 163mL NaCl solution with a concentration of 300g / L. Under the conditions of stirring speed of 100r / min and temperature of 85℃, add 10mL of concentrated hydrochloric acid until the pH of the suspension system is about 2.5. , Heating ...

Embodiment 2

[0026] Weigh 1000g of electric dust removal ash from the sintering die, and its chemical composition analysis is shown in Table 2.

[0027] Table 2 Example 2 Sample chemical composition

[0028]

[0029] The sintered ash was added to 10L aqueous solution to which 10g of dispersant was added and stirred to prepare a sintered ash suspension. The suspension was separated by a two-stage gradient magnetic separation of "weak magnetic → strong magnetic", and the tail slurry was filtered and dried to obtain 532g iron content of 56.8% iron concentrate with a lead content of 0.63% and 368.6g tailings with a lead content of 17.03%.

[0030] The tail sludge after the magnetic separation is divided into 4 times of leaching. First, add 1 / 4 amount of tailings to 185mL of 300g / L NaCl solution. Under the conditions of stirring speed of 100r / min and temperature of 85℃, add 12mL of concentrated hydrochloric acid to the suspension system pH=2.5, heating Reaction for 60min. After the reaction, the le...

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Abstract

The invention discloses a method for recovering lead chloride from sintered ashes and preparing lead monoxide, which mainly comprises the following steps of: (A) adding the sintered ashes into industrial water while stirring to prepare into suspension slurry, and carrying out two-stage gradient magnetic concentration consisting of a weak magnetic concentration and strong magnetic concentration onthe suspension slurry of the sintered ashes; (B) adding tail mud obtained from the magnetic concentration in to a NaCl solution, and recovering lead in the tail mud by adopting a chlorination extraction mode of hydrochloric acid and NaCl; and (C) dissolving PbCl2 crystal in a NaCl water solution, adding Na2CO3 into the solution for complete precipitation reaction, centrifugally filtering and washing the suspension solution, and drying and roasting the obtained solid to obtain a lead monoxide produce. The invention can not only completely remove corrosion and damages of elements of lead, copper and the like on a blast furnace when the sintered ashes are directly recycled during iron and steel melting, but also recover and comprehensively utilize the valuable elements.

Description

Technical field [0001] The invention relates to a method for recovering lead chloride from the electric dust removal ash from the flue gas of a sintering machine head of a steel plant and preparing lead monoxide, which belongs to the solid waste treatment technology of steel enterprises. Background technique [0002] Iron ore sintering is an important part of steel production. Sintering ash is the abbreviation and common name of sintering machine head flue gas electrostatic precipitator ash, which is the dust collected by the sintering machine head flue gas electrostatic precipitator during the iron ore sintering process. Its production accounts for about 1% to 2% of the output of sintered ore. At present, China produces about 10 million tons of sintered ash each year. The main chemical composition is Fe 3 O 4 , Fe 2 O 3 , KCl, PbOHCl, PbCl 2 , SiO 2 , A 2 lO 3 Etc. The total lead content is about 3%-10%. [0003] The comprehensive utilization of sintered ash at this stage in Chin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G21/06C01G21/16
Inventor 刘宪杨运泉蒋新民
Owner HUNAN VALIN XIANGTAN IRON & STEEL CO LTD
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