CN109092553B - Beneficiation method for obtaining low-sulfur diaspore concentrate - Google Patents
Beneficiation method for obtaining low-sulfur diaspore concentrate Download PDFInfo
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- CN109092553B CN109092553B CN201810867219.XA CN201810867219A CN109092553B CN 109092553 B CN109092553 B CN 109092553B CN 201810867219 A CN201810867219 A CN 201810867219A CN 109092553 B CN109092553 B CN 109092553B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03B—SEPARATING SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS
- B03B9/00—General arrangement of separating plant, e.g. flow sheets
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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
- C22B1/00—Preliminary treatment of ores or scrap
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Abstract
A beneficiation method for obtaining low-sulfur diasporic concentrate belongs to the technical field of bauxite beneficiation. Carrying out limonite content analysis on the diaspore raw ore to be selected; if the content of the limonite in the raw ore is lower than 8%, adding the limonite with the sulfur content of not higher than 0.03% in the ball milling process before the flotation or reselection to enable the content of the limonite in the raw ore to reach 8%, and after the flotation or reselection, sending the obtained ore pulp into a magnetic separator, wherein the magnetic field intensity is 10000-20000 gausses; and if the content of the limonite in the raw ore is not lower than 8%, directly performing ball milling, flotation or gravity separation, and then sending the ore pulp obtained after the flotation or gravity separation into a magnetic separator, wherein the magnetic field intensity is 10000-20000 gausses. The method can reduce the sulfur content of diaspore with the sulfur content of more than 5 percent to be less than 0.3 percent, thereby meeting the requirement of Bayer process for producing alumina. Low cost, meeting the requirement of environmental protection and remarkable economic benefit.
Description
Technical Field
The invention belongs to the technical field of bauxite beneficiation, and particularly relates to a beneficiation method for obtaining low-sulfur diaspore concentrate.
Background
The presence of sulfur in either form during the bayer process for alumina production can have a serious impact on production. The production practice shows that in the Bayer process for the production of alumina, it is a requirement that the diaspore concentrate has a sulphur content of less than 0.3% by weight (the contents described below are all percentages by weight). The primary presence of sulfur in high-sulfur diaspore type bauxite and the subsequent conversion during the production process are complicated. When the sulfur content of the diaspore raw ore exceeds 5 percent, the pyrite and pyrrhotite (Fe1-xS) in the diaspore are easy to be changed into ferric hydroxide under the oxidation condition and release sulfate ions due to the links of blasting, open-air storage, transportation, crushing, grinding, ore dressing and the like in the production process of the white iron ore. The sulfate ion increases with the increase of the sulfur content of the diaspore raw ore, increases with the increase of the surface area of ore particles, and increases with the increase of the storage and transportation production time, and the conventional ore dressing methods such as the existing flotation and gravity separation are difficult to remove the partial sulfate, so that the diaspore concentrate containing the sulfur below 0.3 percent is difficult to obtain.
CN201210278252.1 discloses an oxidative desulfurization-magnetic iron removal pretreatment method for high-sulfur bauxite, which comprises the steps of adding sufficient pyrite or sulfur ore blending into the high-sulfur bauxite, carrying out dry grinding, and then carrying out roasting desulfurization in a roasting furnace to obtain an ore resource suitable for a Bayer process alumina production process. The method has the disadvantages of environmental pollution, high roasting energy consumption and high production cost.
CN200810302361.6 discloses a desulfurization method for high-sulfur bauxite, wherein the bauxite is pretreated by magnetization, and the bauxite after the magnetization is desulfurized by a levigating magnetic separation process. In fact, the daily treatment capacity of an bauxite dressing plant is over thousand tons, a special electromagnetic radiation reaction tank with huge capacity and large electric power is needed by using the method, the high-sulfur bauxite stored in open air on site cannot be in a dry state, and pre-magnetization is difficult when water is much, so that the power consumption is high, the cost is high, and the magnetization pretreatment effect is difficult to control. The method is only suitable for laboratories and is difficult to implement in actual production.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a beneficiation method for obtaining low-sulfur diaspore concentrate, which does not increase environmental pollution, has low energy consumption and low cost and can be practically used in bauxite dressing plants.
The method of the invention comprises the following steps:
carrying out limonite content analysis on the diaspore raw ore to be selected;
if the content of the limonite in the raw ore is lower than 8%, adding the limonite with the sulfur content of not higher than 0.03% in the ball milling process before the flotation or reselection to enable the content of the limonite in the raw ore to reach 8%, and after the flotation or reselection, sending the obtained ore pulp into a magnetic separator, wherein the magnetic field intensity is 10000-20000 gausses;
and if the content of the limonite in the raw ore is not lower than 8%, directly performing ball milling, flotation or gravity separation, and then sending the ore pulp obtained after the flotation or gravity separation into a magnetic separator, wherein the magnetic field intensity is 10000-20000 gausses.
The method can reduce the sulfur content of diaspore with the sulfur content of more than 5 percent to be less than 0.3 percent, thereby meeting the requirement of Bayer process for producing alumina. Research shows that goethite in the limonite has strong adsorption capacity to a plurality of acid radical ions, and the diaspore raw ore contains the limonite containing the goethite. The invention removes sulfur by absorbing sulfate radicals by goethite in limonite, and limonite is added when the content of limonite in raw ore is not enough to absorb sulfate radicals in raw ore and produced in each link of production; when the content of limonite in the diaspore raw ore is more than 8 percent, no addition is needed. By adopting the method to remove sulfur, the added limonite separation plant can be self-sufficient, cheap and easily available. The sulfur in diaspore can be floated by floaters and reselected by reselectors, the sulfate which is not floated or reselected is absorbed by the strong adsorption force of goethite in limonite on acid radical ions, and then the limonite which is saturated and adsorbs the sulfate radical is removed by strong magnetic separation, thereby realizing high-efficiency sulfur removal and reducing the sulfur in the high-sulfur diaspore to be below 0.3 percent.
The method has the beneficial effects that the method is a technology which can be really used for production practice, has low cost, meets the requirement of environmental protection, has obvious economic benefit, provides a new method for effectively reducing sulfur of the high-sulfur diasporic bauxite, changes unavailable resources into available resources, enlarges the available resource reserves of the high-sulfur bauxite, and greatly improves the production economic and technical indexes.
Detailed Description
Example 1: certain high sulfur diaspore raw ores contain 7.2% sulfur, with a limonite content of 2.5% being observed. Limonite which accounts for 5.5 percent of the weight of the raw ore and contains 0.012 percent of sulfur is added in the ball milling process, strong magnetic separation is carried out after the flotation, and the magnetic field intensity is 16000 gauss. After magnetic separation, the sulfur content in the obtained diaspore concentrate is 0.21 percent, which completely meets the requirement of producing alumina by a Bayer process.
Example 2: some high-sulfur diaspore crude ore contains 14.6 percent of sulfur, wherein the content of limonite is actually measured to be 15.26 percent, no limonite is needed to be added in the ball milling process, the raw ore is reselected after ball milling and then is subjected to strong magnetic separation, the magnetic field intensity is 12000 gauss, the content of sulfur in the diaspore concentrate obtained after the magnetic separation is 0.29 percent, and the requirements of Bayer process production of aluminum oxide are completely met.
The above examples are only for further illustration of the present invention, and the scope of the present invention is not limited by the examples.
Claims (1)
1. A beneficiation method for obtaining low-sulfur diaspore concentrate is characterized in that:
carrying out limonite content analysis on the diaspore raw ore to be selected;
if the content of the limonite in the raw ore is lower than 8%, adding the limonite with the sulfur content of not higher than 0.03% in the ball milling process before the flotation or reselection to enable the content of the limonite in the raw ore to reach 8%, and after the flotation or reselection, sending the obtained ore pulp into a magnetic separator, wherein the magnetic field intensity is 10000-20000 gausses;
and if the content of the limonite in the raw ore is not lower than 8%, directly performing ball milling, then performing flotation or reselection, and then sending the ore pulp obtained after the flotation or reselection into a magnetic separator, wherein the magnetic field intensity is 10000-20000 gausses.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810867219.XA CN109092553B (en) | 2018-08-01 | 2018-08-01 | Beneficiation method for obtaining low-sulfur diaspore concentrate |
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| CN201810867219.XA CN109092553B (en) | 2018-08-01 | 2018-08-01 | Beneficiation method for obtaining low-sulfur diaspore concentrate |
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| Publication Number | Publication Date |
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| CN109092553A CN109092553A (en) | 2018-12-28 |
| CN109092553B true CN109092553B (en) | 2020-03-27 |
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Family Cites Families (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| HU169643B (en) * | 1974-12-24 | 1977-02-28 | ||
| HU173698B (en) * | 1976-12-07 | 1979-07-28 | Magyar Aluminium | Method for intensifying the processing according to bayer technology bauxites containing diaspore and/or goethite and/or fine dispersed hematite |
| RU2256615C1 (en) * | 2004-02-04 | 2005-07-20 | Акционерное общество "Алюминий Казахстана" | Bauxite processing method |
| CN101302020B (en) * | 2008-06-26 | 2010-11-24 | 贵州大学 | High-sulphur alumyte desulfuration method |
| CN101456572B (en) * | 2008-12-26 | 2011-02-16 | 东北大学 | Method for producing alumina by using high sulphur bauxite |
| CN102228869B (en) * | 2011-04-14 | 2012-12-05 | 昆明理工大学 | Flotation method for desulfurization and desilication of high-silicon bauxite |
| CN102247818A (en) * | 2011-05-27 | 2011-11-23 | 中南大学 | Adsorbent for removing sulfate ions contained in water body as well as preparation and application thereof |
| CN102489406B (en) * | 2011-11-22 | 2013-04-17 | 中国铝业股份有限公司 | Method for treating sulfur bauxite |
| CN102815730B (en) * | 2012-08-07 | 2016-08-24 | 北京化工大学 | Oxidation sweetening-the magnetization of a kind of high-sulfur bauxite removes ferrum preprocess method |
| CN104556169B (en) * | 2014-12-24 | 2016-08-17 | 中南大学 | Sodium aluminate solution based on recyclable regenerative sulfur elimination removes ferrum and the technique of sulfur |
| CN105234006B (en) * | 2015-09-17 | 2018-02-02 | 中国铝业股份有限公司 | A kind of method of high-sulfur bauxite synchronization floatation desulphurization desiliconization |
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