CN1530173A - Beneficiation method for medium-low grade bauxite - Google Patents

Beneficiation method for medium-low grade bauxite Download PDF

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Publication number
CN1530173A
CN1530173A CNA031197299A CN03119729A CN1530173A CN 1530173 A CN1530173 A CN 1530173A CN A031197299 A CNA031197299 A CN A031197299A CN 03119729 A CN03119729 A CN 03119729A CN 1530173 A CN1530173 A CN 1530173A
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China
Prior art keywords
bauxite
concentrate
low
beneficiation method
ore
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CNA031197299A
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Chinese (zh)
Inventor
平 赵
赵平
赵恒勤
张艳娇
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Zhengzhou Institute of Multipurpose Utilization of Mineral Resources CAGS
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Zhengzhou Institute of Multipurpose Utilization of Mineral Resources CAGS
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Priority to CNA031197299A priority Critical patent/CN1530173A/en
Publication of CN1530173A publication Critical patent/CN1530173A/en
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  • Manufacture And Refinement Of Metals (AREA)
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Abstract

The invention discloses a beneficiation method of medium-low grade bauxite. The method adopts selective crushing and a classification control method to remove silicon-containing gangue in the bauxite with the aluminum-silicon ratio of 4-6, so that the requirement of alumina industry on the bauxite ore is met after the medium and low grade ore is enriched. According to the difference of silicon minerals contained in the raw bauxite ore, the aluminum-silicon ratio of the bauxite ore concentrate can reach more than 9 or more than 13, and the recovery rate can reach more than 82% or more than 85%. Compared with the existing flotation technology, the method has the characteristics of simple process, no use of chemical agents, stable flow, high resource utilization rate, low construction cost, easy industrial implementation and contribution to environmental protection.

Description

A kind of beneficiation method of middle-low bauxite
Invention field
The present invention relates to a kind of beneficiation method of middle-low bauxite.
Background technology
China bauxite resource based in low-grade, wherein A/S (alumina silica ratio) accounts for more than 50% of China's bauxite reserves for the bauxite of 4-6, mineralogical composition is mainly diaspore, and the impurity siliceous mineral is generally based on clay minerals such as kaolinite, illite, pyrophillites.The main method of producing aluminium oxide at present has sintering process, Bayer process and combination method.Characteristics such as it is low that wherein Bayer process has investment, and production cost is low, but be suitable for handling the ore of A/S>9.So need will in low-grade bauxite carry out ore dressing and improve A/S value, to satisfy the requirement of using alumina producing Bayer process.
China's ore concentration of bauxite is based on flotation (referring to Fig. 1) at present, and wherein floating agent is the key problem in technology part of ore concentration of bauxite.Adopt flotation technology to handle bauxite and have the concentrate grade height, rate of recovery advantages of higher.But the floatation process complexity, concentrate thickening filtration difficulty, simultaneously the floating agent of retaining in the concentrate will the follow-up Bayer process process of severe exacerbation, and relative cost is higher; Medicament also has certain influence to environmental protection in addition.
Summary of the invention
Purpose of the present invention just provides the beneficiation method that a kind of technology simply, does not need to make the middle-low bauxite of with medicament, to solve complex process, cost height, the investment that existing method for floating exists and to influence problem of environment.
Technical scheme of the present invention is: at first raw ore is pulverized, be finely ground to partition size then in selective milling equipment, adopt conventional wet method crude classification to isolate rough concentrate and a mine tailing again.
Described rough concentrate is carried out sorting and filters out bauxite concentrate.
With a described mine tailing again subfractionation isolate true tailings and scavenger concentrate, will sweep concentrate and return the circulation of described rough classification.
Described raw ore pulverising step adopts conventional equipment that original ore powder is broken to the 40-70 order; In selective milling equipment, be finely ground to the 100-160 order.
Described rough classification graded concentration is at 15-37%, and partition size is at 5-15 μ m.
Technical thought that the present invention adopts is different from flotation flowsheet fully, its basic technological approaches is at first according to the difference of diaspore in the bauxite and clay mineral hardness and grindability, carry out optionally ore grinding in grinding attachment, diaspore is owing to the hardness height, and grindability is poor, with respect to enrichment in thick rank, and the clay siliceous mineral is low owing to hardness, and grindability is good, with respect to enrichment in thin rank, definite then optimum granularity is carried out classification, obtains the bauxite rough concentrate.
Cooperate powerful classification and sorting process flow process to carry out classification and sorting in conventional classification flow process, bauxite concentrate grade A/S>9 that obtain at last, bauxite mineral recovery rate>80%, A/S in the mine tailing<1.5.
Because the present invention utilizes the different physical characteristic of raw ore to carry out ore grinding, so the bauxite concentrate concentration that adopts the present invention to obtain is big, does not need to concentrate and can filter, do not contain any chemical agent, help aluminium oxide and leach and follow-up Bayer process process; Microfine clay impurity content is few, helps the red-mud settlement in the aluminum oxide production process.
Compare with existing flotation technology, it is simple that the present invention has technology, do not use chemical agent, and flow process is stable, the resource utilization height, and construction cost is low, and is industrial easy to implement, helps the characteristics of environmental protection.The present invention also is suitable for handling the thicker ore of raw ore grain size number, can obtain A/S>13, the technical indicator of bauxite mineral recovery rate>85%.
Description of drawings
Fig. 1 is the typical process flow figure of floatation in the prior art;
Fig. 2 is a process chart of the present invention.
The invention will be further described below in conjunction with drawings and Examples.
Specific embodiment
Embodiment 1:
Select representative middle-low bauxite sample 1000 grams, typical chemical composition is: Al 2O 362.23%, SiO 213.65%, A/S4.65Fe 2O 34.43%, typical mineral composition composition is: diaspore content is 67%, kaolinite 19.5%, and illite 7%, other is mainly the iron content titanium mineral.
With sample on jaw crusher and the double-roll crusher through broken process 1.1 to-2mm, in conical ball mill, roughly grind operation 1.2 to 50-65 orders through routine, in the selective milling machine, carry out selective milling operation 2 and be crushed to 140 orders, select the partition size of 12 μ m as bauxite and clay mineral, adopt subsidence style to carry out rough classification operation 3, obtain the bauxite rough concentrate, weight is 837 grams, and A/S is 8.15.One time mine tailing weight is 156 grams, and A/S is 2.28.
The above-mentioned rough concentrate that obtains is carried out sorting 4 and filters 5 in separator, obtain bauxite concentrate, weight is 782 grams, A/S is 9.75, one time mine tailing carries out subfractionation 6 again in classifying equipoment, obtain scavenger concentrate 33 grams and true tailings (A/S is 1.37) 120 grams, scavenger concentrate returns the rough classification circulation.
Embodiment 2:
Select representative in a low mouthful of position alum clay sample ore 1000 grams, typical chemical composition is: Al 2O 364.15%, SiO 212.93%, A/S497, Fe 2O 34.07%, typical mineral composition composition is: diaspore content is 67%, kaolinite 2.5%, and other is mainly the iron content titanium mineral.
With sample on jaw crusher and the double-roll crusher after broken 1.1 to-2mm, in conical ball mill, carry out routine corase grind 1.2 to 50-65 orders, in the selective milling machine, carry out selective milling 2 and be crushed to 120 orders, select the partition size of 10 μ m, adopt subsidence style to carry out rough classification 3, obtain the bauxite rough concentrate as bauxite and clay mineral, weight is 843 grams, A/S is that 9.78, mine tailing weight are 151 grams, and A/S is 2.16.
The above-mentioned rough concentrate that obtains is carried out sorting 4 and filters 5 in separator, obtain bauxite concentrate, weight is 803 grams, and A/S is 13.21.One time mine tailing carries out subfractionation 6 again in classifying equipoment, obtains scavenger concentrate 31 grams and true tailings (A/S is 1.37) 118 grams, and scavenger concentrate returns the rough classification circulation.
More than broken process 1.1 and conventional corase grind 1.2 among two embodiment constitute pulverizing process 1 of the present invention.

Claims (5)

1, a kind of beneficiation method of middle-low bauxite is characterized in that: at first raw ore is pulverized, be finely ground to partition size then in selective milling equipment, adopt conventional wet method crude classification to isolate rough concentrate and a mine tailing again.
2, the beneficiation method of middle-low bauxite according to claim 1 is characterized in that: described rough concentrate is carried out sorting and filters out bauxite concentrate.
3, the beneficiation method of middle-low bauxite according to claim 1 is characterized in that: with a described mine tailing again subfractionation isolate true tailings and scavenger concentrate, will sweep concentrate and return the circulation of described rough classification.
4, according to the beneficiation method of claim 1,2 or 3 described middle-low bauxites, it is characterized in that: described raw ore pulverising step adopts conventional equipment that original ore powder is broken to the 40-70 order; In selective milling equipment, be finely ground to the 100-160 order.
5, according to the beneficiation method of claim 1,2 or 3 described middle-low bauxites, it is characterized in that: described rough classification graded concentration is at 15-37%, and partition size is at 5-15 μ m.
CNA031197299A 2003-03-10 2003-03-10 Beneficiation method for medium-low grade bauxite Pending CN1530173A (en)

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Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN100448545C (en) * 2005-09-23 2009-01-07 贵阳铝镁设计研究院 High-iron gibbsite material grinding process
CN1911523B (en) * 2005-08-09 2010-04-28 郝志刚 Technological method capable of enhancing ore dressing efficiency and ore dressing index
CN103706483A (en) * 2013-11-29 2014-04-09 河南东大矿业股份有限公司 Method for judging selectivity of diasporic bauxite
CN105344487A (en) * 2015-11-19 2016-02-24 中国地质科学院郑州矿产综合利用研究所 Regulator for bauxite direct flotation and using method thereof
CN105344463A (en) * 2015-11-25 2016-02-24 昆明冶金研究院 Method for sorting bauxite with medium-low alumina-silica ratio
CN106111534A (en) * 2016-07-01 2016-11-16 中国矿业大学 A kind of modular bauxite by dry method sorting process
CN106994385A (en) * 2017-05-17 2017-08-01 内蒙古科技大学 A kind of selective reducing mechanism of ore and method
CN108554594A (en) * 2018-05-14 2018-09-21 湖南埃铝环保科技有限公司 A kind of low-grade bauxite beneficiation method
CN108686828A (en) * 2018-05-29 2018-10-23 湖南埃铝环保科技有限公司 A method of sorting carries iron and removes sodium from red mud
CN112307733A (en) * 2020-10-15 2021-02-02 平和县鑫泰德远矿业有限公司 Pyrophyllite ore stacking method convenient for ore blending

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1911523B (en) * 2005-08-09 2010-04-28 郝志刚 Technological method capable of enhancing ore dressing efficiency and ore dressing index
CN100448545C (en) * 2005-09-23 2009-01-07 贵阳铝镁设计研究院 High-iron gibbsite material grinding process
CN103706483A (en) * 2013-11-29 2014-04-09 河南东大矿业股份有限公司 Method for judging selectivity of diasporic bauxite
CN105344487B (en) * 2015-11-19 2018-05-08 中国地质科学院郑州矿产综合利用研究所 Regulator for bauxite direct flotation and using method thereof
CN105344487A (en) * 2015-11-19 2016-02-24 中国地质科学院郑州矿产综合利用研究所 Regulator for bauxite direct flotation and using method thereof
CN105344463B (en) * 2015-11-25 2018-07-13 昆明冶金研究院 One kind selecting method for distinguishing for middle low alumina-silicon ratio alumyte
CN105344463A (en) * 2015-11-25 2016-02-24 昆明冶金研究院 Method for sorting bauxite with medium-low alumina-silica ratio
CN106111534B (en) * 2016-07-01 2018-01-30 中国矿业大学 A kind of modular bauxite by dry method sorting process
CN106111534A (en) * 2016-07-01 2016-11-16 中国矿业大学 A kind of modular bauxite by dry method sorting process
CN106994385A (en) * 2017-05-17 2017-08-01 内蒙古科技大学 A kind of selective reducing mechanism of ore and method
CN108554594A (en) * 2018-05-14 2018-09-21 湖南埃铝环保科技有限公司 A kind of low-grade bauxite beneficiation method
CN108686828A (en) * 2018-05-29 2018-10-23 湖南埃铝环保科技有限公司 A method of sorting carries iron and removes sodium from red mud
CN108686828B (en) * 2018-05-29 2021-03-19 湖南埃铝环保科技有限公司 Method for separating, extracting iron and removing sodium from red mud
CN112307733A (en) * 2020-10-15 2021-02-02 平和县鑫泰德远矿业有限公司 Pyrophyllite ore stacking method convenient for ore blending

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