CN109022817A - The new process of high chlorine lead smelting gas dechlorination - Google Patents

The new process of high chlorine lead smelting gas dechlorination Download PDF

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Publication number
CN109022817A
CN109022817A CN201810848414.8A CN201810848414A CN109022817A CN 109022817 A CN109022817 A CN 109022817A CN 201810848414 A CN201810848414 A CN 201810848414A CN 109022817 A CN109022817 A CN 109022817A
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CN
China
Prior art keywords
dechlorination
alkali
high chlorine
lead smelting
smelting gas
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN201810848414.8A
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Chinese (zh)
Inventor
彭志平
雷日华
许化龙
邓永喜
张旭明
盘华湘
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Chenzhou Strong Wind Environmental Protection Technology Co Ltd
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Chenzhou Strong Wind Environmental Protection Technology Co Ltd
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Publication date
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Priority to CN201810848414.8A priority Critical patent/CN109022817A/en
Publication of CN109022817A publication Critical patent/CN109022817A/en
Pending legal-status Critical Current

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    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B13/00—Obtaining lead
    • C22B13/02—Obtaining lead by dry processes
    • C22B13/025—Recovery from waste materials
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B1/00—Preliminary treatment of ores or scrap
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B11/00—Obtaining noble metals
    • C22B11/02—Obtaining noble metals by dry processes
    • C22B11/021—Recovery of noble metals from waste materials
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B7/00—Working up raw materials other than ores, e.g. scrap, to produce non-ferrous metals and compounds thereof; Methods of a general interest or applied to the winning of more than two metals
    • C22B7/001—Dry processes
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/20—Recycling

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Organic Chemistry (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Manufacturing & Machinery (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Environmental & Geological Engineering (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Manufacture And Refinement Of Metals (AREA)

Abstract

The present invention provides a kind of new process of high chlorine lead smelting gas dechlorination, and using a kind of novel alkaline reagent: compound alkali is made into 2.5% suspension.The present invention includes the following contents: (1) slurrying；(2) dechlorination；(3) pH of alkali wash water, filters pressing are controlled, strong brine passes through pumping double effect evaporator desalination crystallization.Technique of the invention adequately achieves high chlorine lead smelting gas dechlorination, and process is simple, can reduce production cost, reduce energy consumption.

Description

The new process of high chlorine lead smelting gas dechlorination
Technical field
The invention belongs to non-ferrous metallurgy technology field, a kind of new process of high chlorine lead smelting gas dechlorination.
Background technique
High chlorine lead smelting gas main ingredient is PbCl2, since lead chloride fusing point is low, volatility is high, easy deliquescence, in pyrometallurgical smelting When can largely be volatized into flue gas, not only substantially reduce the yield of lead, it is rotten also to will cause subsequent process cloth bag bonding, the equipment of gathering dust The problems such as erosion, therefore in existing production practices, the chloride containing lead materials for entering stokehold can all carry out dechlorination conversion processing.Though Right thermal process has many advantages, such as that treating capacity is big, process is simple, but its there are the disadvantages such as energy consumption height and the rate of recovery be low.Compared to it Under, wet processing is more attractive, and conventional process contains PbCl2Waste material is to carry out dechlorination conversion to lead chloride: first being located in advance with NaCl Manage raw material；Alkali process is carried out with NaOH again, obtains mineral yellow；Finally add (NH4)2CO3Carbonate conversion is carried out, is obtained Thick basic lead carbonate.But this process flow is cumbersome, and at high cost, product is also not pure ceruse.
Summary of the invention
Present invention solves the problem in that providing a kind of economy, pollution-free, dechlorination effect is stablized, convenient for the high chlorine lead of control The new process of silver-colored slag dechlorination.
Technical problems to be solved needed for the present invention can be achieved through the following technical solutions:
A kind of new process of high chlorine lead smelting gas dechlorination, using following steps:
(1) slurrying: compound alkali is made into 2.5% suspension in slurrying pond, stirs slurrying in 20 minutes；
(2) dechlorination: compound alkali suspension investment reaction tank is reacted with high chlorine lead smelting gas, steam heating；When reaction tank is warming up to 65 DEG C~80 DEG C, 1 hour, mixing speed 85r/min are stirred, alkali wash water is obtained；
(3) when controlling the pH=10 of alkali wash water, alkali wash water pumps reactive tank processing industry sulfuric acid tune pH value to filtering after 8, and filter-press residues contain Cl-Average 0.52%, leaded silver；Reduction furnace recycling lead silver is sent, pressing filtering liquid is into sewage plant, and after reverse osmosis dechlorination, clear water is sent back to With pond, strong brine passes through pumping double effect evaporator desalination crystallization.
Preferably, compound alkali main component is calcium hydroxide in (1)；Compound lye solid product mass ratio=4:1.
The present invention considers that (1) step is obtained will be compound in slurrying pond by experiment, economic cost and device efficiency The best liquid solid product mass ratio of alkali slurrying is 4:1.
(2) step other conditions of the present invention are constant, change reaction temperature, investigate its shadow to lead chloride object inversion of phases It rings, test result reaction temperature is to PbCl2Dechlorination rate has certain influence, when temperature is improved by 30 DEG C to 85 DEG C, dechlorination rate by 87.16% is increased to 97.18%, this is because increasing temperature facilitates solution viscosity reduction, accelerates lead ion, chloride ion and hydrogen The diffusion velocity of oxygen radical ion comprehensively considers in the temperature range studied, and reaction temperature is with best for 75 DEG C.
(3) step changes the initial pH of solution, investigates influence of the pH to lead chloride object inversion of phases, and test result shows not Under the conditions of pH, the difference of dechlorination rate clearly: when pH value of solution is adjusted by 10 to 8.0, dechlorination rate from 50.7% improve to 97%.Sulfuric acid tune pH value is added to filtering after 8 to improve the rate of recovery of lead.
The present invention replaces caustic soda and calcined soda for industry de- using the suspension that a kind of compound alkali of novel alkaline reagent is made into 2.5% Chlorine, and control to obtain lead hydroxide by pH value, reach dechlorination purpose；The compound alkali main component of the present invention is hydroxide Calcium, and price is low, greatly reduces production cost.Present invention process process is stablized, and convenient for control, not only efficiently solves environment The problem of pollution, and dechlorination rate reaches 97.18%.Meet the requirement of reduction melting.
Specific embodiment
In order to further appreciate that the present invention, it is described below with reference to our factory's productive experiment.
The high chlorine lead smelting gas of material is tested, it is a kind of multi-metal complex slag charge that high chlorine lead smelting gas, which is our company's outsourcing raw material, material In contain Pb30.34%, Au36.5g/t Ag615g/t, wherein lead is largely lead chloride.
The high chlorine lead smelting gas main ingredient of table one
Element Au Ag Pb Bi Cu Sb Cl- H2O
Content 36.5g/t 615g/t 30.34% 0.03% 0.55% 0.33% 16.5% 19.92%
The experiment compound alkali of material: compound alkali main ingredient is calcium hydroxide, active white clay, diatomite and active carbon.
Experimental procedure: (1) liquid of compound alkali: admittedly for 4:1；(2) 75 DEG C of dechlorination temperature；(3) mixing speed: 85r/min ；(4) mixing time: 1h；(5) terminal Ph=10 are controlled.
Industrial sulphuric acid tune pH value is added to filtering after 8.
Experimental result table 1
Classification Chemical examination number Cl- Au Ag Pb Dechlorination rate %
Alkali wash water SY-13 27.95g/l - - 8.8mg/t -
Alkali wash water SY-15 28.57g/l 0.01g/l - 7.69mg/t -
Alkali wash water SY-17 31.4g/l - - 10.57mg/t -
Alkali cleaning slag SY-14 0.61% 40.9g/l 690g/t 34.01% 96.7
Alkali cleaning slag SY-16 0.51% 41g/l 690.5g/t 34.13% 97.2
Alkali cleaning slag SY-17 0.48% 41.3g/l 690.7g/t 33.98% 97.45
The experimental results showed that compound alkali dechlorination, and control to obtain lead hydroxide by pH value, reach dechlorination purpose, and And dechlorination rate reaches 97.18%.Meet the requirement of reduction melting.
Using the present invention, our factory has handled 3650 tons of high chlorine lead smelting gas, achieves good productivity effect.

Claims (2)

1. a kind of new process of high chlorine lead smelting gas dechlorination, it is characterised in that: use following steps:
(1) slurrying: compound alkali is made into 2.5% suspension in slurrying pond, stirs slurrying in 20 minutes；
(2) dechlorination: compound alkali suspension investment reaction tank is reacted with high chlorine lead smelting gas, steam heating；When reaction tank is warming up to 65 DEG C~80 DEG C, 1 hour, mixing speed 85r/min are stirred, alkali wash water is obtained；
(3) when controlling the pH=10 of alkali wash water, alkali wash water pumps reactive tank processing industry sulfuric acid tune pH value to filtering after 8, and filter-press residues contain Cl-Average 0.52%, leaded silver；Reduction furnace recycling lead silver is sent, pressing filtering liquid is into sewage plant, and after reverse osmosis dechlorination, clear water is sent back to With pond, strong brine passes through pumping double effect evaporator desalination crystallization.
2. the new process of high chlorine lead smelting gas dechlorination according to claim 1, it is characterised in that: compound in the step (1) Alkali main component is calcium hydroxide；Compound lye solid product mass ratio=4:1.
CN201810848414.8A 2018-07-27 2018-07-27 The new process of high chlorine lead smelting gas dechlorination Pending CN109022817A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201810848414.8A CN109022817A (en) 2018-07-27 2018-07-27 The new process of high chlorine lead smelting gas dechlorination

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201810848414.8A CN109022817A (en) 2018-07-27 2018-07-27 The new process of high chlorine lead smelting gas dechlorination

Publications (1)

Publication Number Publication Date
CN109022817A true CN109022817A (en) 2018-12-18

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Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA1156048A (en) * 1980-06-16 1983-11-01 Robert S. Salter Process for the recovery of lead and silver from minerals and process residues
CN101818259A (en) * 2010-05-14 2010-09-01 唐松云 Technology for refining lead from lead chloride slag by means of pyrometallurgy
CN102167392A (en) * 2010-11-25 2011-08-31 王嘉兴 Method for preparing lead hydroxide and silver chloride mixture with waste residues from production of lithopone
JP2012167332A (en) * 2011-02-15 2012-09-06 Taiheiyo Cement Corp Method of collecting silver and copper
CN103540757A (en) * 2012-07-12 2014-01-29 湖南宇腾有色金属股份有限公司 Research on dechloridation process of lead chloride slag
CN103570058A (en) * 2012-07-24 2014-02-12 沈阳有色金属研究院 Method for converting solid lead chloride into lead oxide
CN104711637A (en) * 2013-12-12 2015-06-17 沈阳有色金属研究院 Method for recovering metal lead from solid lead oxide
CN105624423A (en) * 2014-11-05 2016-06-01 沈阳有色金属研究院 Low-temperature lead chloride smelting method employing sawdust as reducing agent

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA1156048A (en) * 1980-06-16 1983-11-01 Robert S. Salter Process for the recovery of lead and silver from minerals and process residues
CN101818259A (en) * 2010-05-14 2010-09-01 唐松云 Technology for refining lead from lead chloride slag by means of pyrometallurgy
CN102167392A (en) * 2010-11-25 2011-08-31 王嘉兴 Method for preparing lead hydroxide and silver chloride mixture with waste residues from production of lithopone
JP2012167332A (en) * 2011-02-15 2012-09-06 Taiheiyo Cement Corp Method of collecting silver and copper
CN103540757A (en) * 2012-07-12 2014-01-29 湖南宇腾有色金属股份有限公司 Research on dechloridation process of lead chloride slag
CN103570058A (en) * 2012-07-24 2014-02-12 沈阳有色金属研究院 Method for converting solid lead chloride into lead oxide
CN104711637A (en) * 2013-12-12 2015-06-17 沈阳有色金属研究院 Method for recovering metal lead from solid lead oxide
CN105624423A (en) * 2014-11-05 2016-06-01 沈阳有色金属研究院 Low-temperature lead chloride smelting method employing sawdust as reducing agent

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
曾林全: "《电解锡生产》", 31 July 1981 *

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