A method for extracting metals from soot

A technology for extracting metals and soot, applied to alkali metal compounds, alkali metal chlorides, chemical instruments and methods, etc., can solve problems such as difficult processing, large differences, complex composition, etc., achieve good technology application prospects, and reduce production costs , significant economic benefits

Active Publication Date: 2022-04-12
INST OF RESOURCES COMPREHENSIVE UTILIZATION GUANGDONG ACAD OF SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Usually, the content of Cl in the formed soot reaches more than 30%, and also contains metals such as Pb, Zn, Cu, Rb, K, Na, etc., which is very different from traditional smelting soot such as copper smelting soot and lead smelting soot, and the composition is extremely complex , the processing difficulty is relatively large, and the existing technology cannot effectively dispose of and realize the comprehensive utilization of resources

Method used

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  • A method for extracting metals from soot
  • A method for extracting metals from soot
  • A method for extracting metals from soot

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] use figure 1 The process shown is for the extraction of metals from soot and the processing of smelting soot. Specifically: Take 500g of heavy metal industrial sludge smelting soot, and its component analysis is shown in Table 1.

[0042] Table 1

[0043]

[0044] Processing includes the following steps:

[0045] Add 40g K to the soot 2 CO 3 , add 1500ml of water to carry out leaching at room temperature, react for 3h and then filter to obtain 1356ml of lead-containing filter residue and metal-rich solution. Measure 500ml of water to wash the lead-containing filter residue, wash twice, and obtain 135g of lead concentrate after filtering.

[0046] Add 20g K to the metal-rich solution 2 CO 3 and 8g Na 2 CO 3 carry out the reaction, then filter to obtain the filter residue, and use 100ml water to wash the filter residue to obtain ZnCO 3 Product 26.4g. Then add 5g NaOH and 7g K to the filtrate 2 CO 3 , adjust the pH to 11, filter again to obtain 1319ml of pu...

Embodiment 2

[0057] use figure 1 The process shown is for the extraction of metals from soot and the processing of smelting soot. Specifically: Take 500g of heavy metal industrial sludge smelting soot, and its component analysis is shown in Table 1.

[0058] Processing includes the following steps:

[0059] Add 30g K to the soot 2 CO 3 and 8g KHCO 3 , add 1300ml of water for leaching at 50°C, react for 2 hours and then filter to obtain 1176ml of lead-containing filter residue and metal-rich solution. Measure 400ml of water to wash the lead-containing filter residue for 3 times, and obtain 132g of lead concentrate after filtering.

[0060] Add 25g K to the metal-rich solution 2 CO 3 , filtered to obtain the filtrate and filter residue, and the precipitated residue was washed with 100ml of water to obtain ZnCO 3 Product 21.4g. Then add 6g KOH and 6g NaOH to the filtrate, adjust the pH to 12, filter again to obtain 1143ml of purified solution, the quality of purified solution is 1321...

Embodiment 3

[0071] use figure 1 The process shown is for the extraction of metals from soot and the processing of smelting soot. Specifically: Take 500g of heavy metal industrial sludge smelting soot, and its component analysis is shown in Table 2.

[0072] Table 2

[0073]

[0074] Processing includes the following steps:

[0075] Add 30g K to the soot 2 CO 3 and 15g KHCO 3, add 1200ml of water for leaching at 70°C, react for 1.5h and then filter to obtain 1037ml of lead-containing filter residue and metal-rich solution. Measure 400ml of water to wash the lead-containing filter residue, wash twice, and obtain 147.3g of lead concentrate after filtering.

[0076] Add 30g K to the metal-rich solution 2 CO 3 and 10g Na 2 CO 3 , filtered to obtain the filtrate and filter residue, and the precipitated residue was washed with 100ml of water to obtain ZnCO 3 Product 35.1 g. Then add 9g of KOH to the filtrate, adjust the pH to 10, and filter again to obtain 1017ml of purified solut...

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Abstract

The invention belongs to the technical field of solid waste treatment and specifically discloses a method for extracting metals from soot. The method of the present invention first adds carbonate to the soot for leaching, so that Cu and Pb in the soot are converted into carbonate precipitates, and filtered to obtain lead concentrate and metal-rich solution; then carbonate is added to the metal-rich solution, and filtered to obtain ZnCO 3 Product; adjust the pH of the filtrate to alkaline, filter to obtain the purified solution, evaporate and crystallize the purified solution to obtain the KCl product, evaporate the mother liquor to obtain the RbCl product through extraction, washing, stripping, precipitation, and calcination, and the raffinate is neutralized and crystallized Get mixed salt. The method for extracting metals from soot provided by the present invention can separate and recover Cu, Pb, Zn and Rb, K, Na in soot, and prepare high value-added ZnCO 3 , RbCl, KCl and lead concentrate and other products, realize the efficient extraction of valuable metals in soot, eliminate the secondary pollution of soot, and have obvious environmental and economic benefits.

Description

technical field [0001] The invention relates to the technical field of solid waste treatment, in particular to a method for extracting metals from soot. Background technique [0002] Soot is one of the main wastes in the pyrometallurgy industry, which contains valuable metals such as Cu, Zn, Pb, Ni, Cd, Bi, etc. It is a high-value hazardous solid waste that has both resource utilization and environmental hazards. At present, the recovery rate of valuable metals in many hazardous waste recycling enterprises in China is relatively low, generally only about 80%, and the environmental pollution and waste of resources are quite serious. The existing soot treatment technologies are mainly aimed at copper smelting soot and lead smelting soot. For example, copper smelting soot contains valuable components such as copper, lead, and zinc. The treatment processes for copper smelting soot mainly include blast furnace smelting, combined dressing and smelting. method, pyro-wet combined m...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B7/02C22B1/00C01D17/00C01G9/00C01D3/04
CPCC22B7/02C22B7/006C22B1/005C01D17/003C01G9/00C01D3/04Y02P10/20
Inventor 刘勇吕建芳周济吕先谨马致远李湘陈志强薛文涛周吉奎洪庆寿
Owner INST OF RESOURCES COMPREHENSIVE UTILIZATION GUANGDONG ACAD OF SCI
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