阅读说明：本技术 一种胶磷矿反浮选脱镁原矿精准配矿的方法 (Method for accurately matching raw demagging ores by reverse flotation of collophanite ) 是由 吴兴买 阮长希 柏中能 李天华 王文毓 孔令发 周军 王朝霞 沈成元 李飞 于 2020-06-09 设计创作，主要内容包括：本发明提供一种胶磷矿反浮选脱镁原矿精准配矿的方法,涉及磷酸磷肥生产技术领域。该方法包括以下步骤：S1、将单一反浮选脱镁原矿分为四类,分别标注为A、B、C与D四类；S2、根据磷酸、磷肥生产对磷精矿浆MER值的要求,将MER值分为高、中、低三档；S3、进行胶磷矿单一反浮选脱镁工艺,得到工艺前后原矿、精矿P<Sub>2</Sub>O<Sub>5</Sub>、MgO、R<Sub>2</Sub>O<Sub>3</Sub>指标变化规律。本发明,通过发掘胶磷矿在浮选脱镁前后MER值的变化规律,得出原矿每脱除1％MgO,精矿P<Sub>2</Sub>O<Sub>5</Sub>升高1.4-1.5％,R<Sub>2</Sub>O<Sub>3</Sub>升高7-9％,精矿MER值较原矿降低30-50％的经验值,采用倒推法计算入选原矿需要的P<Sub>2</Sub>O<Sub>5</Sub>、MgO、R<Sub>2</Sub>O<Sub>3</Sub>指标,确定合适的原矿配比和组合,保证浮选脱镁生产的精矿达到要求的质量指标。(The invention provides a method for accurately preparing a demagging raw ore by reverse flotation of a collophanite, and relates to the technical field of phosphate fertilizer production. The method comprises the following steps: s1, dividing the single reverse flotation demagging raw ore into four types, which are respectively marked as A, B, C and D four types; s2, dividing the MER value into three grades, namely high, medium and low, according to the requirements of phosphoric acid and phosphate fertilizer production on the MER value of the phosphate concentrate slurry; s3, carrying out a collophanite single reverse flotation magnesium removal process to obtain raw ore and concentrate P before and after the process 2 O 5 、MgO、R 2 O 3 And (4) index change rules. According to the invention, the change rule of MER values before and after the flotation and the magnesium removal of the collophanite is explored, so that 1 percent of MgO is removed from the raw ore, and concentrate P is obtained 2 O 5 Increase by 1.4-1.5%, R 2 O 3 Increasing by 7-9%, and reducing MER value of concentrate by 30-50% compared with that of raw ore, and calculating P required by raw ore selection by reverse-pushing method 2 O 5 、MgO、R 2 O 3 And (4) indexes, namely determining proper raw ore proportion and combination, and ensuring that the concentrate produced by flotation and magnesium removal meets the required quality indexes.)

1. A method for accurately matching crude demagging ores by reverse flotation of collophanite is characterized by comprising the following steps: the method comprises the following steps:

s1, dividing the single reverse flotation demagging raw ore into four types, which are respectively marked as A, B, C and D four types;

s2, dividing the MER value into three grades, namely high, medium and low, according to the requirements of phosphoric acid and phosphate fertilizer production on the MER value of the phosphate concentrate slurry;

s3, carrying out a collophanite single reverse flotation magnesium removal process to obtain raw ore and concentrate P before and after the process₂O₅、MgO、R₂O₃The index change rule;

s4, according to the change rule of the process indexes obtained in the step 3, removing 1 percent of MgO and concentrate P from the raw ore₂O₅Increase by about 1.4-1.5%, R₂O₃The change rule that the MER value of the concentrate is reduced by 30-50% compared with that of the raw ore is increased by 7-9% and is used as the basis for calculating and preparing the quality index of the raw ore;

s5, reversely pushing P in the raw ore according to the requirements of different products produced by phosphoric acid and phosphate fertilizer in the step 2 on MER value of phosphate concentrate₂O₅、MgO、R₂O₃Content and MER value, and then taking the four types of raw ores obtained in the step 1 as P₂O₅、MgO、R₂O₃As factors, different proportion combinations are carried out, and P of the selected raw ore is calculated₂O₅、MgO、R₂O₃And controlling the value, and determining the optimal ore blending scheme and ore blending proportion.

2. The method for the precise ore blending of the demagging raw ore by the reverse flotation of the collophanite according to claim 1, characterized in that: the specific content in the step 1 is as follows:

i) the A is high-phosphorus high-magnesium ore, wherein P in the high-phosphorus high-magnesium ore₂O₅27.0-28.0% of MgO, 2-3% of R₂O₃The content is 1.7-2.0%, and the MER value is 0.132-0.185;

ii) B is high-phosphorus low-magnesium ore, wherein P in the high-phosphorus low-magnesium ore₂O₅27.5-28.5% of MgO, 1.0-1.2% of R₂O₃The content is 2.4-2.8%, and the MER value is 0.119-0.145;

iii) class C is a low phosphorus low magnesium ore, wherein P₂O₅24.5-25.5% of MgO, 0.6-0.9% of R₂O₃The content is 3.0-3.4%, and the MER value is 0.141-0.180;

iv) D is a low-phosphorus high-magnesium ore, P₂O₅25.0-26.0% of MgO, 3.0-4.0% of R₂O₃The content is 1.5-1.8%, and the MER value is 0.173-0.232.

3. The method for the precise ore blending of the demagging raw ore by the reverse flotation of the collophanite according to claim 1, characterized in that: the high MER value in the step 2 is 0.115-0.130; a medium MER value of 0.095 to 0.115; the low MER value is 0.085-0.095.

4. The method for the precise ore blending of the demagging raw ore by the reverse flotation of the collophanite according to claim 1, characterized in that: the collophanite single reverse flotation magnesium removal process is a single ore type single flotation separation process which is used for enriching and utilizing concentrate by adding medicine, mixing pulp, stirring, mineralizing and aerating for flotation, floating gangue mineral carbonate mineral into foam product, discharging the foam product as tailings and leaving useful mineral phosphate mineral in non-foam product.

Technical Field

The invention relates to the technical field of phosphate fertilizer production, in particular to a method for accurately proportioning crude ore of collophanite reverse flotation demagging.

Background

The phosphorite is mainly used for preparing phosphate fertilizer as the essential raw material for plant growth. The quality of phosphoric acid and phosphate fertilizer mainly depends on the quality of phosphate ore. In the process of manufacturing phosphoric acid and phosphorus fertilizer, the requirements for the quality of phosphate ore vary with the processing method and the property type of the phosphate ore, and the most significant of the quality requirements of the phosphate ore is P₂O₅High and low content of iron-aluminum sesquioxide R₂O₃(Fe₂O₃+Al₂O₃) MgO and SiO₂The content of the compound is small. P in phosphorus ores during wet phosphoric acid processing₂O₅Is a useful component, R₂O₃MgO and SiO₂Is a useless impurity. The quality of the phosphate ore is generally measured by the MER value which is Fe abroad₂O₃、Al₂O₃The sum of MgO contents and P₂O₅Ratio of contents, i.e. MER ═ Fe₂O₃+Al₂O₃+MgO)/P₂O₅The higher the MER value, the higher the impurity content and the worse the ore quality. The MER value of the phosphate ore is directly related to the MER value of phosphoric acid produced by wet-process phosphoric acid, the MER value of the phosphate ore is high, the MER value of the produced phosphoric acid is also high, and the quality of the phosphoric acid is poor; the MER value of the phosphate ore is low, the MER value of the produced phosphoric acid is low, and the quality of the phosphoric acid is good. Therefore, the MER value of the phosphate ore is high or lowDetermines the high and low of the MER value of the phosphoric acid. In the process of producing phosphoric acid and phosphate fertilizer products with different qualities, according to the different requirements of the products with different qualities on the MER value of phosphate ore in the subsequent production of phosphate fertilizer, the ore blending control of the corresponding MER value of raw phosphate ore is of great importance, and at present, an effective accurate raw ore blending method is not available.

Disclosure of Invention

Technical problem to be solved

Aiming at the defects of the prior art, the invention provides a method for accurately matching the demagnetised raw ore by reverse flotation of the collophanite, which solves the defects and shortcomings in the prior art.

(II) technical scheme

In order to achieve the purpose, the invention is realized by the following technical scheme: a method for accurately matching crude ore of collophanite reverse flotation demagging comprises the following steps:

s1, dividing the single reverse flotation demagging raw ore into four types, which are respectively marked as A, B, C and D four types;

s2, dividing the MER value into three grades, namely high, medium and low, according to the requirements of domestic products, export products and high-quality phosphate fertilizer products produced by phosphoric acid and phosphate fertilizer on the MER value of the concentrate slurry of the phosphate;

s3, carrying out a collophanite single reverse flotation magnesium removal process to obtain raw ore and concentrate P before and after the process₂O₅、MgO、R₂O₃The index change rule;

s4, according to the change rule of the process indexes obtained in the step 3, removing 1 percent of MgO and concentrate P from the raw ore₂O₅Increase by about 1.4-1.5%, R₂O₃The change rule that the MER value of the concentrate is reduced by 30-50% compared with that of the raw ore is increased by 7-9% and is used as the basis for calculating and preparing the quality index of the raw ore;

s5, reversely pushing P in the raw ore according to the requirements of different products produced by phosphoric acid and phosphate fertilizer in the step 2 on MER value of phosphate concentrate₂O₅、MgO、R₂O₃Content and MER value, and then taking the four types of raw ores obtained in the step 1 as P₂O₅、MgO、R₂O₃As a factor, different proportion combinations are carried out,calculating P of ore to be selected₂O₅、MgO、R₂O₃And controlling the value, and determining the optimal ore blending scheme and ore blending proportion.

Preferably, the specific content in step 1 is as follows:

i) the A is high-phosphorus high-magnesium ore, wherein P in the high-phosphorus high-magnesium ore₂O₅27.0-28.0% of MgO, 2-3% of R₂O₃The content is 1.7-2.0%, and the MER value is 0.132-0.185;

ii) B is high-phosphorus low-magnesium ore, wherein P in the high-phosphorus low-magnesium ore₂O₅27.5-28.5% of MgO, 1.0-1.2% of R₂O₃The content is 2.4-2.8%, and the MER value is 0.119-0.145;

iii) class C is a low phosphorus low magnesium ore, wherein P₂O₅24.5-25.5% of MgO, 0.6-0.9% of R₂O₃The content is 3.0-3.4%, and the MER value is 0.141-0.180;

iv) D is a low-phosphorus high-magnesium ore, P₂O₅25.0-26.0% of MgO, 3.0-4.0% of R₂O₃The content is 1.5-1.8%, and the MER value is 0.173-0.232.

Preferably, the high MER value in the step 2 is 0.115-0.130; a medium MER value of 0.095 to 0.115; the low MER value is 0.085-0.095.

Preferably, the collophanite single reverse flotation magnesium removal process is a single flotation separation process for enriching and utilizing a concentrate by adding chemicals, mixing slurry, stirring, mineralizing and aerating for flotation, floating gangue mineral carbonate mineral (dolomite) into a foam product, discarding the foam product as a tailing, and leaving useful mineral phosphate mineral (collophanite) in a non-foam product.

(III) advantageous effects

The invention provides a method for accurately matching crude ore of collophanite reverse flotation demagging. The method has the following beneficial effects:

according to the invention, the change rule of MER values before and after the flotation and the magnesium removal of the collophanite is explored, so that 1 percent of MgO is removed from the raw ore, and concentrate P is obtained₂O₅Increase by 1.4-1.5%, R₂O₃Is raised7-9%, the MER value of the concentrate is reduced by 30-50% compared with that of the raw ore, and the P required by the selected raw ore is calculated by adopting a reverse push method₂O₅、MgO、R₂O₃And (4) indexes, namely determining proper raw ore proportion and combination, and ensuring that the concentrate produced by flotation and magnesium removal meets the required quality indexes.

Drawings

FIG. 1 is a schematic flow chart of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

As shown in fig. 1, the invention provides a method for accurately proportioning crude ore of demagging by reverse flotation of collophanite, which comprises the following steps:

s1, dividing the single reverse flotation demagging raw ore into four types, respectively labeled as A, B, C and D, and specifically comprising the following steps:

i) the A is high-phosphorus high-magnesium ore, wherein P in the high-phosphorus high-magnesium ore₂O₅27.0-28.0% of MgO, 2-3% of R₂O₃The content is 1.7-2.0%, and the MER value is 0.132-0.185;

ii) B is high-phosphorus low-magnesium ore, wherein P in the high-phosphorus low-magnesium ore₂O₅27.5-28.5% of MgO, 1.0-1.2% of R₂O₃The content is 2.4-2.8%, and the MER value is 0.119-0.145;

iii) class C is a low phosphorus low magnesium ore, wherein P₂O₅24.5-25.5% of MgO, 0.6-0.9% of R₂O₃The content is 3.0-3.4%, and the MER value is 0.141-0.180;

iv) D is a low-phosphorus high-magnesium ore, P₂O₅25.0-26.0% of MgO, 3.0-4.0% of R₂O₃The content is 1.5-1.8%, and the MER value is 0.173-0.232；

S2, dividing the MER value into high, medium and low grades according to the requirements of domestic products, export products and high-quality phosphate fertilizer products produced by phosphoric acid and phosphate fertilizer on the MER value of the concentrate slurry of the phosphate, wherein the high MER value is 0.115-0.130; a medium MER value of 0.095 to 0.115; low MER values of 0.085 to 0.095;

s3, carrying out a collophanite single reverse flotation magnesium removal process to obtain raw ore and concentrate P before and after the process₂O₅、MgO、R₂O₃The index change rule is that the collophanite single reverse flotation demagging process is a single flotation separation process of a single ore type which is used for enriching and utilizing concentrate, wherein the gangue mineral carbonate mineral (dolomite) is floated into a foam product through adding medicine for size mixing, stirring for mineralization and inflating flotation, the gangue mineral carbonate mineral (dolomite) is discarded as tailings, and useful mineral phosphate mineral (collophanite) is left in a non-foam product;

s4, according to the change rule of the process indexes obtained in the step 3, removing 1 percent of MgO and concentrate P from the raw ore₂O₅Increase by about 1.4-1.5%, R₂O₃The change rule that the MER value of the concentrate is reduced by 30-50% compared with that of the raw ore is increased by 7-9% and is used as the basis for calculating and preparing the quality index of the raw ore;

s5, reversely pushing P in the raw ore according to the requirements of different products produced by phosphoric acid and phosphate fertilizer in the step 2 on MER value of phosphate concentrate₂O₅、MgO、R₂O₃Content and MER value, and then taking the four types of raw ores obtained in the step 1 as P₂O₅、MgO、R₂O₃As factors, different proportion combinations are carried out, and P of the selected raw ore is calculated₂O₅、MgO、R₂O₃And controlling the value, and determining the optimal ore blending scheme and ore blending proportion.

The collophanite in the invention is the commonly known name of sedimentary phosphorite rock in which carbon fluorapatite exists in the form of a colloidal amorphous aggregate in the phosphorite.

R in the invention₂O₃Refers to the sum of the sesquioxide (sesquioxide) in the phosphate ore and the phosphoric acid, namely AL₂O₃+Fe₂O₃The sum of (1) and (2).

The MER value in the invention refers to the main impurities (MgO + AL) in phosphate ore and phosphoric acid₂O₃+Fe₂O₃) Sum of contents and P₂O₅The ratio of the contents.

The following table 1 is a standard ore blending table based on the precision ore blending method of the MER value of the phosphate ore, and all the percentages are mass percentages in the invention;

TABLE 1