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

A lead monoxide and sintered ash technology, applied in the directions of lead monoxide, lead oxide, lead halide, etc., can solve the problems of nodulation in the furnace, reducing the strength of the blast furnace charge, cracking of the furnace wall, etc. Longevity and the effect of reducing the wind break rate

Active Publication Date: 2010-06-09
HUNAN VALIN XIANGTAN IRON & STEEL CO LTD +1
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  • 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 sintered head electrostatic dust, and its chemical composition analysis is shown in Table 1, Table 4.

[0021] Table 1 Example 1 Sample Chemical Composition

[0022]

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

[0024] The tail sludge after the above magnetic separation is divided into three leaching times. First, 1 / 3 of the tail sludge was added to 163 mL of NaCl solution with a concentration of 300 g / L. Under the conditions of a stirring speed of 100 r / min and a temperature of 85 °C, 10 mL of concentrated hydrochloric acid was added until the pH of the suspension syst...

Embodiment 2

[0026] Weigh 1000g of sintered head electrostatic dust, 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 10 L of aqueous solution to which 10 g of dispersant had been added and stirred to obtain a sintered ash suspension. The suspension was subjected to two-stage gradient magnetic separation of "weak magnetic → strong magnetic", and the tailings were filtered and dried to obtain 532 g of iron with an iron content of 532 g. 56.8% iron ore concentrate with 0.63% lead and 368.6g of tailings with 17.03% lead.

[0030] The tail sludge after the above magnetic separation is divided into 4 times of leaching. First, 1 / 4 of the tail sludge was added to 185 mL of NaCl solution with a concentration of 300 g / L. Under the condition that the stirring speed was 100 r / min and the temperature was 85 °C, 12 mL of concentrated hydrochloric acid was added until the pH of the suspen...

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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 on the 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 and preparing lead monoxide from sintering machine head flue gas electrostatic ash in iron and steel plants, and belongs to the solid waste treatment technology of iron and steel enterprises. Background technique [0002] Iron ore sintering is an important part of iron and steel production. Sintering ash is the abbreviation and common name of sintering machine head flue gas electrostatic precipitator, 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 sintered ore output. At present, the annual sintered ash produced in China is as high as 10 million tons, and the main chemical component is Fe. 3 O 4 , Fe 2 O 3 , KCl, PbOHCl, PbCl 2 , SiO 2 , A 2 lO 3 etc., in which the total lead content is about 3% to 10%. [0003] At present, the comprehensive utiliz...

Claims

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Application Information

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Patent Type & Authority Applications(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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