CN103553109A - Comprehensive utilization method of magnesium-smelting slag from Pidgeon process - Google Patents

Comprehensive utilization method of magnesium-smelting slag from Pidgeon process Download PDF

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Publication number
CN103553109A
CN103553109A CN201310472586.7A CN201310472586A CN103553109A CN 103553109 A CN103553109 A CN 103553109A CN 201310472586 A CN201310472586 A CN 201310472586A CN 103553109 A CN103553109 A CN 103553109A
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magnesium
slag
production
pidgeonprocess
comprehensive utilization
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CN103553109B (en
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吴永
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YINCHUAN ENERGY INSTITUTE
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YINCHUAN ENERGY INSTITUTE
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    • 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
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A40/00—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production
    • Y02A40/10—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production in agriculture
    • Y02A40/20—Fertilizers of biological origin, e.g. guano or fertilizers made from animal corpses
    • 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

Abstract

The invention discloses a comprehensive utilization method of magnesium-smelting slag from a Pidgeon process. The comprehensive utilization method comprises the following steps of smashing the magnesium-smelting slag from the Pidgeon process; dissolving the smashed magnesium-smelting slag with an acid; adding a precipitant in a first filtered solution after the acid solution is filtered for a first time so as to make CaCl2 in the first filtered solution generate a CaSO4.2H2O precipitate; then carrying out a secondary filtration; and making the obtained CaSO4.2H2O precipitate into paste powder. The secondary filtered solution is used as a liquid nitrogen fertilizer. Aiming at chemical components of the magnesium-smelting slag from the Pidgeon process, in the comprehensive utilization method of the magnesium-smelting slag from the Pidgeon process, various chemical components in a reducing slag are separated, extracted and utilized successively according to an idea of circular economy and a conception of making the best use of everything, the magnesium-smelting slag from the Pidgeon process is turned into wealth and utilized comprehensively; pollutions of the magnesium-smelting slag to the environment is effectively treated and some economic benefits are created for enterprises.

Description

The method of comprehensive utilization of production of magnesium by pidgeonprocess slag
Technical field
The present invention relates to nonferrous metallurgy industry technology field, particularly relate to a kind of method of comprehensive utilization of production of magnesium by pidgeonprocess slag.
Background technology
Know in the industry, Pidgeon process belongs to the silicothermic process in vacuum metallurgy, is called for short silicothermic process, by Canadian Toronto college professor L.M.Pidgeon invention, is the main method of production MAGNESIUM METAL.It is raw material that the method be take calcination (or calcining) rhombspar (be commonly called as forge white), and ferrosilicon (ferrosilicon that contains 75～80%Si) is reductive agent, adds appropriate fluorite (CaF 2), after batching, combined grinding, be pressed into pelletizing feed.A material is put into refractory alloy steel vacuum reducing tank (inside is evacuated to 13.3～1.33Pa or higher vacuum tightness), be heated to 1200 ± 10 ℃ (boiling point Tb.p.=1107 ℃ of magnesium), by Si, reduce and forge the magnesium oxide in white (CaO+MgO), generation magnesium vapor is overflowed, with calcium silicate slag (2CaOSiO 2) enter after separation in the condenser of reduction tank front end and separate out crude magnesium (Crystalline Magnesium), after coming out of the stove, through refining, can obtain highly purified MAGNESIUM METAL again.
Production of magnesium by pidgeonprocess technique is simple, and small investment of production equipment adds that China has the good source condition of production of magnesium by pidgeonprocess, and therefore the magnesium of China's refining at present industry mostly adopts Pidgeon process, and 2011 yearly capacities have reached 1,580,000 tons, belong to the big producing country of world's MAGNESIUM METAL.But the shortcoming of production of magnesium by pidgeonprocess maximum is that its solid slag quantity discharged is large, generally producing 1 ton of MAGNESIUM METAL approximately has 8～10 tons of slag emissions.，Ge manufacturer is mostly that it is directly toppled over as solid waste for the processing of this solid slag at present, has so not only taken soil, and its efflorescence thing one chance is blown, white dust flies upward all over the sky, causes environmental pollution, is also objectively the waste of Nonrenewable resources.In prior art, also have some reducing slags that utilize production of magnesium by pidgeonprocess to produce the bibliographical information of air-entrained concrete building blocks and novel wall material aspect, but these amplification that can not smelt throughput with magnesium far away adapt.The comprehensive utilization mode of therefore, seeking a kind of production of magnesium by pidgeonprocess slag becomes China's refining magnesium industry urgent problem.
Summary of the invention
The present invention is directed to existing production of magnesium by pidgeonprocess process slag quantity discharged large, be difficult to the problem of comprehensive utilization, proposed the method for comprehensive utilization of production of magnesium by pidgeonprocess slag.
The technical solution used in the present invention is:
A method of comprehensive utilization for production of magnesium by pidgeonprocess slag, is characterized in that its technique comprises following processing step: production of magnesium by pidgeonprocess slag is pulverized, with acid, dissolved, after once filtering, in a filtered liquid, add precipitation agent to make CaCl wherein 2generate CaSO 42H 2o precipitation, and then carry out secondary filtration, the CaSO of gained 42H 2o precipitation is made terra alba, and secondary filtrate is as liquid nitrogenous fertilizer.
Grinding particle size 3～the 0.1mm of described production of magnesium by pidgeonprocess slag.
Describedly with acid, dissolve and to refer to the hydrochloric acid that mass concentration is 3%～7% and dissolve.
A described filtered filtration residue and ferroalloy production waste coke fines, binding agent proportioning are pressed into smelting duriron group material.
Described binding agent is tar, starch or polyvinyl alcohol, and addition is 4～8% of raw material total amount.
Described precipitation agent is (NH 4) 2sO 4.
The method of comprehensive utilization of production of magnesium by pidgeonprocess slag of the present invention is for the Chemical Composition of production of magnesium by pidgeonprocess slag, according to circular economy concept and the conception of making the best use of everything, the various chemical compositions of reducing slag are carried out to separation and Extraction utilization successively, thereby make production of magnesium by pidgeonprocess slag turn waste into wealth, be fully utilized, the environmental pollution simultaneously it being caused is effectively administered, and can also create certain economic benefit for enterprise.
Accompanying drawing explanation
Fig. 1 is basic flowsheet of coal preparation of the present invention.In figure, the meaning of each numbering representative is as follows:
1: production of magnesium by pidgeonprocess slag; 2: the hot furnace gas of reduction furnace or the hot furnace gas of rotary kiln; 3: fine terra alba; 4: secondary filtrate (liquid nitrogenous fertilizer); 5: ferroalloy works' coke fines of giving up; 6: tackiness agent; 7: group's material for smelting duriron.
1-1: milling equipment; 1-2: stirred tank; 1-3: filtration unit; 1-4: reactive tank; 1-5: filtration unit; 1-6: drying plant; 1-7: mixing equipment; 1-8: suppress agglomerating equipment.
Embodiment
(1) pulverize: production of magnesium by pidgeonprocess slag 1 use milling equipment 1-1 is pulverized, be crushed to granularity 3～0.1mm.
(2) acid is molten: the Mg-smelting furnace slag of pulverizing is sent into stirred tank 1-2, add 3%～7% hydrochloric acid, with hydrochloric acid, the solvend in slag is dissolved.Principal reaction: CaO+2HCl==CaCl 2+ H 2o.Also has MgO, Al 2o 3and K, Na oxide compound also dissolve in wherein.
(3) once filter: the reaction solution after acid is molten installs after filtration 1-3 and filters, indissoluble and insoluble oxide compound Fe 2o 3, SiO 2deng being filtered out as filter residue.Collect first-time filtrate.
(4) first-time filtrate terra alba processed: first-time filtrate is put into reactive tank 1-4, add sulfate precipitation agent, make the CaCl in filtrate 2react with precipitation agent and generate CaSO 42H 2o precipitation.
Conventional Ca 2+precipitation agent has: carbonate, sulfate radical, phosphate radical, oxalate, MnO4 etc.Therefore in the present invention, consider that filtrate will continue comprehensive utilization, select with (NH 4) 2sO 4as Ca 2+precipitation agent.
Principal reaction is as follows:
CaCl 2＋(NH 4) 2SO 4+2H 2O＝＝Ca?SO 4·2H 2O↓＋2NH 4Cl
(5) secondary filtration: use filtration unit 1-5 by CaSO 42H 2o sedimentation and filtration out, utilizes the hot furnace gas 2 of reduction furnace or rotary kiln to dry at drying plant 1-6, has utilized the heat energy of furnace gas, makes terra alba 3.Secondary filtrate 4 is collected, in filtrate except NH 4cl, also has Mg 2+, Fe 3+, Al 3+, Na +, K +plasma, can be used as liquid nitrogenous fertilizer.(fertilising of drip irrigation and spray irrigation formula, wherein Mg 2+can make up the impact that magnesium deficiency causes, and other micro-Fe 3+, Al 3+, K +, Na +plasma belongs to security element/ion.）
(6) filter residues are pressed into smelting duriron group material: during a waste residue is produced with ferroalloy works, produce waste material---coke fines 5, tackiness agent 6 mix in mixing equipment 1-7, in suppressing agglomerating equipment 1-8, suppress agglomerating material 7.Press SiO in recrement 2and Fe 2o 3it is coke fines (by coke fines fixed carbon content and be converted into butt) that the actual content of (or amounting to FeO) is allocated required reductive agent into.The smelting FeSi75 that presses as on the low side in ferriferous oxide content in recrement wants supplement to adjust refined iron mine powder, as higher, can in total furnace charge, to silica, give balanced adjustment.Described tackiness agent is tar, starch, polyvinyl alcohol etc., and addition is 4～8% of raw material total amount.

Claims (6)

1. a method of comprehensive utilization for production of magnesium by pidgeonprocess slag, is characterized in that its technique comprises following processing step: production of magnesium by pidgeonprocess slag is pulverized, with acid, dissolved, after once filtering, in a filtered liquid, add precipitation agent to make CaCl wherein 2generate CaSO 42H 2o precipitation, and then carry out secondary filtration, the CaSO of gained 42H 2o precipitation is made terra alba, and secondary filtrate is as liquid nitrogenous fertilizer.
2. according to the method for comprehensive utilization of claim 1 production of magnesium by pidgeonprocess slag, it is characterized in that the grinding particle size 3～0.1mm of described production of magnesium by pidgeonprocess slag.
3. according to the method for comprehensive utilization of claim 1 production of magnesium by pidgeonprocess slag, it is characterized in that describedly with acid, dissolving and referring to the hydrochloric acid that mass concentration is 3%～7% and dissolve.
4. according to the method for comprehensive utilization of claim 1 production of magnesium by pidgeonprocess slag, it is characterized in that a described filtered filtration residue and ferroalloy production waste coke fines, binding agent proportioning are pressed into smelting duriron group material.
5. according to the method for comprehensive utilization of claim 1 production of magnesium by pidgeonprocess slag, it is characterized in that described binding agent is lime, tar, starch or polyvinyl alcohol, addition is 4～8% of raw material total amount.
6. according to the method for comprehensive utilization of claim 1 production of magnesium by pidgeonprocess slag, it is characterized in that described precipitation agent is (NH 4) 2sO 4.
CN201310472586.7A 2013-10-11 2013-10-11 Comprehensive utilization method of magnesium-smelting slag from Pidgeon process Expired - Fee Related CN103553109B (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106032331A (en) * 2015-03-16 2016-10-19 大地亮环保服务有限公司 Method for producing liquid fertilizer containing secondary trace elements by water washing treatment of blast furnace slag
CN110734349A (en) * 2019-10-31 2020-01-31 西安交通大学 calcium magnesium phosphorus compound fertilizer prepared from waste slag from Pidgeon magnesium smelting and method thereof

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1140765A (en) * 1995-07-15 1997-01-22 兰州大学 Treating method for waste slag of smelting magnesium
CN102030566A (en) * 2010-11-22 2011-04-27 北京科技大学 New process for producing efficient calcium magnesium sulphur silicon fertilizer by utilizing slag from magnesium reduction furnace
CN102115084A (en) * 2010-12-31 2011-07-06 张胜勇 Method for producing silicon dioxide and calcium sulfate from phosphorous slag
CN102899516A (en) * 2012-11-08 2013-01-30 石嘴山市学礼工贸有限公司 Zero-emission recycling technology for refined waste residues of magnesium alloys
CN103030312A (en) * 2013-01-10 2013-04-10 朱广东 Treatment method of magnesium metal smelting waste slag

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1140765A (en) * 1995-07-15 1997-01-22 兰州大学 Treating method for waste slag of smelting magnesium
CN102030566A (en) * 2010-11-22 2011-04-27 北京科技大学 New process for producing efficient calcium magnesium sulphur silicon fertilizer by utilizing slag from magnesium reduction furnace
CN102115084A (en) * 2010-12-31 2011-07-06 张胜勇 Method for producing silicon dioxide and calcium sulfate from phosphorous slag
CN102899516A (en) * 2012-11-08 2013-01-30 石嘴山市学礼工贸有限公司 Zero-emission recycling technology for refined waste residues of magnesium alloys
CN103030312A (en) * 2013-01-10 2013-04-10 朱广东 Treatment method of magnesium metal smelting waste slag

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张朝晖等: "硅石粉和焦粉粘结压块试验", 《钢铁研究》, vol. 37, no. 3, 30 June 2009 (2009-06-30), pages 11 - 13 *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106032331A (en) * 2015-03-16 2016-10-19 大地亮环保服务有限公司 Method for producing liquid fertilizer containing secondary trace elements by water washing treatment of blast furnace slag
CN110734349A (en) * 2019-10-31 2020-01-31 西安交通大学 calcium magnesium phosphorus compound fertilizer prepared from waste slag from Pidgeon magnesium smelting and method thereof

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