CN100500299C - Phosphate rock floating process - Google Patents
Phosphate rock floating process Download PDFInfo
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- CN100500299C CN100500299C CNB2007100516994A CN200710051699A CN100500299C CN 100500299 C CN100500299 C CN 100500299C CN B2007100516994 A CNB2007100516994 A CN B2007100516994A CN 200710051699 A CN200710051699 A CN 200710051699A CN 100500299 C CN100500299 C CN 100500299C
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Abstract
The phosphate rock floating process is one phosphate rock grading forward-backward floating process, in which the raw ore pulp is first separated into two parts of different fineness and then forward-backward floated in two separated branches. The coarse ore pulp is made to separated in high concentration so as to save floating chemical; while the fine ore pulp is floated through adding dispersant to raise the floating efficiency. The grading floating process can avoid the mutual interference between coarse and fine grains, and thus has raised separating efficiency, raised floated concentrate quality, lowered floating chemical consumption and raised technological and economic indexes.
Description
Technical field
The present invention relates to a kind of flotation process of phosphorite.
Background technology
Floatation is one of main method of flotation of phosphate rock.Because the difference of phosphorus ore geologic origin, dopant species and content, phosphate rock floating can have diversified technology, Chang Yong single direct flotation flow process for example, and single reverse flotation flowsheet, just-reverse flotation flowsheet, instead-and the direct flotation flow process, two reverse flotation flowsheets etc.
[1-7]
Silicon calcium quality ore is occupied an leading position in China's phosphate rock resource, and 1. its flotation process mainly contains (phosphorus ore thing) single direct flotation flow process, 2. (silicon or magnesium) single reverse flotation flowsheet, 3. just-reverse flotation flowsheet, 4. anti--direct flotation flow process, 5. two reverse flotation flowsheets etc.
[1-7]In phosphate rock floating, the ore milling product granularity of mineral and distribution thereof have extremely important influence to floatation indicators
[8-9]Granularity is when using the siliceous impurity of organic amine reverse flotation to the exemplary of phosphate rock floating influence, and the foam that fine fraction (sludge) can cause too much, glue excessively also causes simultaneously the consumption of collecting agent organic amine to increase.So before the reverse flotation of phosphorus ore desiliconization at home and abroad, all thin rank need be removed.In phosphate rock floating, the granularity of mineral and distribution thereof generally can produce serious influence to flotation results.To not dividing the flotation of stage material, its general flotation rule is: coarse fraction and fine fraction are difficult floating, and middle grade is then easily floating.Phosphorus ore just-reverse flotation be domestic research and use more, also be to use one of successful phosphate rock floating technology.Low-grade in the many genus of China's phosphate rock resource, and phosphorus ore thing disseminated grain size is thinner, and its flotation majority needs the fine grinding ore deposit.Because the nonhomogeneous hardness of various mineral compositions is bigger in the rock phosphate in powder, the direct result in this fine grinding ore deposit promptly is to cause the ore milling product granularity extremely inhomogeneous, produces a large amount of particulates, easily selective enrichment in fine fraction such as garrulous mineral such as dolomite.Because dolomite and phosphorus ore thing are under alkaline direct flotation condition, floatability is close, so in the phosphorus ore direct flotation a large amount of fine-graded dolomites unavoidably will with phosphorus ore thing competitive Adsorption floating agent, its result causes the difficult come-up of the coarse fraction of direct flotation phosphorus ore thing often, fine fraction then seriously is mingled with, and floating agent particularly collecting agent consumption is also often bigger.This influence of granularity also will continue to the reverse flotation process and cause anti-floating decrease in efficiency.
List of references:
[1] Luo Zhaojun, money is prosperous, Wang Wenqian, 1999, the new development of flotation of phosphate rock both at home and abroad, Chinese Mining Industry, Vol.8No.4, pp 50-53.
[2] Peng Ru, 1989, collect the commentary of phosphorite ore-dressing technique, chemical mine technology, Vol.18 No.6, pp 16-17 recklessly.
[3] Wei Xiangsong, 1992, research of collophane reverse flotation dolomite and industrial prospect, Vol.12 No.4, pp 31-34.
[4] Luo Zhaojun, Wang Wenqian, money is prosperous, and 1999, development of Phosphate Ore Flotation, chemical industry mineral and processing, No.7, pp 1-3,7.
[5]Prasad，M.，Majumder，A.K.，Rao，T.C.，2000，Reverse?flotation?ofsedimentaery?calcareous/dolomitic?rock?phosphate?ore—an?overview，Minerals?andMetallurgical?Processing，Vol.17，No.1，pp?49-55。
[6]El-Shall，H.，Zhang，P.，Abdel?KhalekN.，El-Mofty?S.，2004，Beneficiationtechnology?of?phosphates：Challenges?and?solutions，Minerals?and?MetallurgicalProcessing，Vol.21，No.1，pp?17-26。
[7]Zafar?Iqbal?Zafar，M.M.Anwar?and?D.W.Pritchard，1996，Innovations?inbeneficiation?technology?for?low?grade?phosphate?rocks，Nutrient?Cycling?inAgroecosystems，Vol.46，No.2，pp?135-151。
[8]Peng，F.F.，Gu，Z.，2005，Processing?Florida?dolomitic?phosphate?pebble?ina?double?reverse?fine?flotation?process，Minerals?and?Metallurgical?Processing，Vol.22，No.1，pp?23-30。
[9] Zhong Kangnian, 1991, grinding mode is to the influence of phosphorus ore reverse flotation, chemical mine technology, Vol.20, No.1, pp 25-26.
[10] CPTF plum, 1989, Jinning County's phosphorus ore stage flotation flow test, Yunnan metallurgy, No.5, pp 29-30.
Summary of the invention
The object of the present invention is to provide a kind of flotation process of phosphorite that improves flotation efficiency, reduces reagent consumption.
For achieving the above object, technical scheme of the present invention is: a kind of flotation process of phosphorite is characterized in that it comprises the steps:
1) the phosphorus ore raw ore is through after the fine grinding, and raw ore slurry enters a classifying equipoment (as hydrocyclone) raw ore slurry is divided into coarse fraction, two parts of fine fraction by the grain graininess size;
2a) to be concentrated into concentration be 55% ore pulp to coarse fraction part raw ore slurry, flow into tank diameter then, add respectively in ore pulp again that direct flotation is adjusted agent and the direct flotation collecting agent is sized mixing (being that coarse fraction adopts high concentration pulping), material after sizing mixing enters the direct flotation system and carries out direct flotation after thin up is 35% ore pulp, product is the direct flotation mine tailing in the groove, discharge and stack, the direct flotation froth pulp enters the reverse flotation tank diameter; And add respectively in the reverse flotation tank diameter that reverse flotation is adjusted agent and collecting agent in reverse floatation is sized mixing, material after sizing mixing enters the reverse flotation system and carries out reverse flotation, froth pulp is the reverse flotation mine tailing, discharge and stack, product is low magnesium phosphorus concentrate in the groove, through concentrating, filter, be drying to obtain the finished product concentrate;
2b) to size mixing to concentration be 30% ore pulp to fine fraction part raw ore, flow into tank diameter then, add dispersant (having added dispersant in the fine fraction flotation) to tank diameter, adding direct flotation adjustment agent and direct flotation collecting agent again in ore pulp respectively sizes mixing, material after sizing mixing enters the direct flotation system and carries out direct flotation, product is the direct flotation mine tailing in the groove, discharges and stacks, and the direct flotation froth pulp enters the reverse flotation tank diameter; And add respectively in the reverse flotation tank diameter that reverse flotation is adjusted agent and collecting agent in reverse floatation is sized mixing, material after sizing mixing enters the reverse flotation system and carries out reverse flotation, froth pulp is the reverse flotation mine tailing, discharge and stack, product is low magnesium phosphorus concentrate in the groove, through concentrating, filter, be drying to obtain the finished product concentrate.
Described step 2a) in, the addition that direct flotation is adjusted agent, direct flotation collecting agent is respectively 2-5kg/t coarse fraction part raw ore slurry, 1-2kg/t coarse fraction part raw ore slurry, and the addition that reverse flotation is adjusted agent, collecting agent in reverse floatation is respectively 5-10kg/t coarse fraction part raw ore slurry, 0.5-1.0kg/t coarse fraction part raw ore slurry.
Described step 2b) in, the addition that direct flotation is adjusted agent, direct flotation collecting agent is respectively 2-5kg/t fine fraction part raw ore slurry, 1-2kg/t fine fraction part raw ore slurry, and the addition that reverse flotation is adjusted agent, collecting agent in reverse floatation is respectively 5-10kg/t fine fraction part raw ore slurry, 0.5-1.0kg/t fine fraction part raw ore slurry.
The grain graininess of described fine fraction part raw ore slurry is for being less than or equal to the classifying equipoment partition size, and the grain graininess of coarse fraction part raw ore slurry is greater than the classifying equipoment partition size, and the classifying equipoment partition size is between between the 38-54 micron.
It is sodium carbonate or waterglass that described direct flotation is adjusted agent.Described direct flotation collecting agent is a fatty acid soaps.
It is inorganic acid (as sulfuric acid, phosphoric acid) that described reverse flotation is adjusted agent.Described collecting agent in reverse floatation fatty acid soaps.
The direct flotation system of described coarse fraction part adopts the mechanical agitation type flotation machine.
The direct flotation system of described fine fraction part adopts flotation column (energy-saving, as to be beneficial to selected).
The addition of described dispersant is a 0.2-1kg/t fine fraction part raw ore slurry.
Described dispersant is Dextrin (dextrin), calgon or wooden calcium sulfonate.
The present invention adopts the phosphorus ore raw ore through after the fine grinding, and ore pulp enters a classifying equipoment (as hydrocyclone) raw ore slurry is divided into thick, thin two parts by the grain graininess size; Flotation flowsheet also begins the bifurcated road thus; The coarse fraction part is because difficult floating need be carried out high concentration pulping, to reduce the consumption of floating agent; Fine fraction is more floating, but generally is mingled with comparatively seriously, and selected difficulty so the flotation of this part need be strengthened dispersion, needs to add stronger dispersant in the flotation; Fine particles flotation equipment also is convenient to adopt and is helped selected and energy-conservation flotation column flotation; Slightly, fine-graded direct flotation concentrate enters reverse flotation flowsheet part separately respectively, proceeds the de-magging reverse flotation.This kind classification just-reverse flotation flowsheet can significantly reduce the floating agent consumption of direct flotation, the concentrate quality that top-ups also obviously is better than common not classification bulk flotation flow process (seeing Table 1).Though flow process of the present invention is just more common-reverse flotation flowsheet is slightly complicated, for large-scale flotation producer, its realization there is no difficulty; Only need two series with former flotation flowsheet, one is used to handle coarse fraction, and one is used to handle fine fraction and gets final product, and other parts of flow process need not change.
The present invention is different with general desliming floatation process, and desliming just removes extremely difficult choosing or low-quality superfine grade part (generally being≤10-20 micron grade), and this fine fraction no longer handles through flotation, directly abandon or incorporate into final concentrate [
6-8].The classification partition size of stage flotation flow process of the present invention is between between the 38-54 micron; This granularity will be far above general desliming granularity, and each product after the classification all need carry out corresponding flotation and handle, and be accordingly, size mixing targetedly, flotation handles; A kind of coarse grain of directly telling is also arranged in addition as final concentrate, and only fine fraction enters the stage flotation flow process of flotation
[10]It also is different from total matter stage flotation flow process of the present invention.
The invention has the beneficial effects as follows: adopt raw ore slurry is divided into thick, thin two parts by the grain graininess size, flotation flowsheet also begins the bifurcated road thus, is divided into thick, thin two grades and is just carrying out respectively-reverse flotation.Slightly, fine fraction can be according to separately flotation characteristic and be optimized respectively, coarse fraction is saved medicament by high concentration pulping; Fine fraction has improved flotation efficiency because of adding dispersant.Phase mutual interference when stage flotation can be avoided bulk flotation between thickness improves the efficiency of separation and flotation concentrate quality, reduces floating agent consumption; Thereby improve the technical-economic index of just whole-reverse flotation.
Description of drawings
Fig. 1 is a flotation process of phosphorite flow chart of the present invention.
The specific embodiment
In order to understand the present invention better, further illustrate content of the present invention below in conjunction with embodiment, but content of the present invention not only is confined to the following examples.
Embodiment 1:
As shown in Figure 1, a kind of flotation process of phosphorite, it comprises the steps:
1) the phosphorus ore raw ore is through after the fine grinding, and raw ore slurry enters a classifying equipoment (as hydrocyclone) raw ore slurry is divided into coarse fraction, two parts of fine fraction by the grain graininess size; The grain graininess of described fine fraction part raw ore slurry is for being less than or equal to 38 microns grades, and the grain graininess of coarse fraction part raw ore slurry is greater than 38 microns grades;
2a) to be concentrated into concentration be 55% ore pulp to coarse fraction part raw ore slurry, flow into tank diameter then, adding direct flotation adjustment agent and direct flotation collecting agent again in ore pulp respectively sizes mixing, direct flotation is adjusted agent, the addition of direct flotation collecting agent is respectively 2kg/t coarse fraction part raw ore slurry, 1.36kg/t coarse fraction part raw ore slurry (t represents ton), material after sizing mixing enters direct flotation system (mechanical agitation type flotation machine) and carries out direct flotation after thin up is 35% ore pulp, product is the direct flotation mine tailing in the groove, discharge and stack, the direct flotation froth pulp enters the reverse flotation tank diameter; And add respectively in the reverse flotation tank diameter that reverse flotation is adjusted agent and collecting agent in reverse floatation is sized mixing, the addition that reverse flotation is adjusted agent, collecting agent in reverse floatation is respectively 5kg/t coarse fraction part raw ore slurry, 0.5kg/t coarse fraction part raw ore slurry, material after sizing mixing enters the reverse flotation system and carries out reverse flotation, froth pulp is the reverse flotation mine tailing, discharge and stack, product is low magnesium phosphorus concentrate in the groove, through concentrating, filter, be drying to obtain the finished product concentrate; It is sodium carbonate that described direct flotation is adjusted agent, and described direct flotation collecting agent is a fatty acid soaps, and it is inorganic acid (as sulfuric acid) that described reverse flotation is adjusted agent, described collecting agent in reverse floatation fatty acid soaps;
2b) to size mixing to concentration be 30% ore pulp to fine fraction part raw ore slurry, flow into tank diameter then, add dispersant to tank diameter, the addition of dispersant is a 0.2kg/t fine fraction part raw ore slurry, adding direct flotation adjustment agent and direct flotation collecting agent again in ore pulp respectively sizes mixing, direct flotation is adjusted agent, the addition of direct flotation collecting agent is respectively 2kg/t fine fraction part raw ore slurry, 1.36kg/t fine fraction part raw ore slurry, material after sizing mixing enters direct flotation system (flotation column) and carries out direct flotation, product is the direct flotation mine tailing in the groove, discharge and stack, the direct flotation froth pulp enters the reverse flotation tank diameter; And add respectively in the reverse flotation tank diameter that reverse flotation is adjusted agent and collecting agent in reverse floatation is sized mixing, the addition that reverse flotation is adjusted agent and collecting agent in reverse floatation is respectively 5kg/t fine fraction part raw ore slurry, 0.5kg/t fine fraction part raw ore slurry, material after sizing mixing enters the reverse flotation system and carries out reverse flotation, froth pulp is the reverse flotation mine tailing, discharge and stack, product is low magnesium phosphorus concentrate in the groove, through concentrating, filter, be drying to obtain the finished product concentrate; Described dispersant is Dextrin (dextrin), and it is sodium carbonate that described direct flotation is adjusted agent, and described direct flotation collecting agent is a fatty acid soaps, and it is inorganic acid (as sulfuric acid) that described reverse flotation is adjusted agent, described collecting agent in reverse floatation fatty acid soaps.
Relatively show by above stage flotation mode sorting silico-calcium matter collophane and direct flotation index (roughly selecting) as table 1 with traditional not classification flotation flowsheet.The raw ore mog is all-200 orders and accounts for 86%, and the partition size of classification direct flotation is 38 microns (400 orders), and other conditions of flotation are identical: 30 ℃ of direct flotation temperature, and positive reverse flotation flowsheet is identical, and final index is close.
Table 1, phosphorus ore stage flotation and not stage flotation floatation indicators comparison
| Floatation indicators | Raw ore P 2O 5，％ | Concentrate P 2O 5，％ | Mine tailing P 2O 5，％ | P 2O 5The rate of recovery, % | Direct flotation collecting agent consumption, kilogram/ton |
| Stage flotation not | 19.26 | 21.72 | 4.95 | 96.32 | 3.0 |
| Stage flotation | 19.52 | 23.62 | 5.08 | 94.30 | 1.36 |
By the result as seen, under the identical situation of other conditions, the rough concentrate quality of stage flotation will obviously be better than stepless traditional floatation, and collecting agent consumption also declines to a great extent.In fact roughly select close with stepless one a thick cleaner flotation flow process concentrate quality for one of stage flotation section.
Perhaps, when partition size is 54 microns, the grain graininess that is fine fraction part raw ore slurry is for being less than or equal to 54 microns, the grain graininess of coarse fraction part raw ore slurry is greater than 54 microns grades, it is 55% ore pulp that coarse fraction part raw ore slurry is concentrated into concentration, it is 30% ore pulp that fine fraction part raw ore is sized mixing to concentration, step 2a) addition of direct flotation collecting agent is a 2kg/t coarse fraction part raw ore slurry in, step 2b) addition of direct flotation collecting agent is a 1kg/t fine fraction part raw ore slurry in, the addition of dispersant is a 1kg/t fine fraction part raw ore slurry, dispersant is calgon or wooden calcium sulfonate, can both realize the present invention, not enumerate embodiment one by one at this.
Claims (5)
1. a flotation process of phosphorite is characterized in that it comprises the steps:
1) the phosphorus ore raw ore is through after the fine grinding, and raw ore slurry enters a classifying equipoment raw ore slurry is divided into coarse fraction, two parts of fine fraction by the grain graininess size; The grain graininess of described fine fraction part raw ore slurry is for being less than or equal to the classifying equipoment partition size, and the grain graininess of coarse fraction part raw ore slurry is greater than the classifying equipoment partition size, and the classifying equipoment partition size is between between the 38-54 micron;
2a) to be concentrated into concentration be 55% ore pulp to coarse fraction part raw ore slurry, flow into tank diameter then, adding direct flotation adjustment agent and direct flotation collecting agent again in ore pulp respectively sizes mixing, material after sizing mixing enters the direct flotation system and carries out direct flotation after thin up is 35% ore pulp, product is the direct flotation mine tailing in the groove, discharge and stack, the direct flotation froth pulp enters the reverse flotation tank diameter; And add respectively in the reverse flotation tank diameter that reverse flotation is adjusted agent and collecting agent in reverse floatation is sized mixing, material after sizing mixing enters the reverse flotation system and carries out reverse flotation, froth pulp is the reverse flotation mine tailing, discharge and stack, product is low magnesium phosphorus concentrate in the groove, through concentrating, filter, be drying to obtain the finished product concentrate;
2b) to transfer to concentration be 30% ore pulp to fine fraction part raw ore slurry, flow into tank diameter then, add dispersant to tank diameter, adding direct flotation adjustment agent and direct flotation collecting agent again in ore pulp respectively sizes mixing, material after sizing mixing enters the direct flotation system and carries out direct flotation, product is the direct flotation mine tailing in the groove, discharges and stacks, and the direct flotation froth pulp enters the reverse flotation tank diameter; And add respectively in the reverse flotation tank diameter that reverse flotation is adjusted agent and collecting agent in reverse floatation is sized mixing, material after sizing mixing enters the reverse flotation system and carries out reverse flotation, froth pulp is the reverse flotation mine tailing, discharge and stack, product is low magnesium phosphorus concentrate in the groove, through concentrating, filter, be drying to obtain the finished product concentrate.
2. a kind of flotation process of phosphorite according to claim 1 is characterized in that: the direct flotation system of described coarse fraction part adopts the mechanical agitation type flotation machine.
3. a kind of flotation process of phosphorite according to claim 1 is characterized in that: the direct flotation system of described fine fraction part adopts flotation column.
4. a kind of flotation process of phosphorite according to claim 1 is characterized in that: the addition of dispersant is a 0.2-1kg/t fine fraction part raw ore slurry.
5. a kind of flotation process of phosphorite according to claim 1 is characterized in that; Described dispersant is Dextrin, calgon or wooden calcium sulfonate.
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| CNB2007100516994A CN100500299C (en) | 2007-03-20 | 2007-03-20 | Phosphate rock floating process |
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| CNB2007100516994A CN100500299C (en) | 2007-03-20 | 2007-03-20 | Phosphate rock floating process |
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2007
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