阅读说明：本技术 一种利用磷矿粉生产磷矿粉球的方法 (Method for producing ground phosphate rock balls by utilizing ground phosphate rock ) 是由 张国强 张弘强 张�杰 于 2020-08-04 设计创作，主要内容包括：本发明提供了一种利用磷矿粉生产磷矿粉球的方法,包括：将磷矿粉100质量份、磷酸1～4质量份、碳酸钙0.5～1质量份；硫酸0.5～3质量份和磷酸盐粘合剂0.5～2质量份混合,压球,烘干、冷却得到磷矿粉球。本发明采用磷酸、硫酸和磷酸盐粘合剂,其中的P<Sub>2</Sub>O<Sub>5</Sub>最终进入炉内参与制磷反应,提高了磷矿石中P<Sub>2</Sub>O<Sub>5</Sub>的含量,提高了磷矿石的品位；同时,添加硫酸可以进一步减少成本,与碳酸钙等其余物质反应,增加最终产品的强度。加入的磷酸和磷矿中的碳酸盐杂质进行化学置换反应,并利用双辊混料器进行混料,充分释放对电炉生产有害的CO<Sub>2</Sub>和有机物,本发明加入的磷酸都是黄磷生产过程中产生的废磷酸,提高了废磷酸的利用价值。(The invention provides a method for producing ground phosphate rock balls by utilizing ground phosphate rock, which comprises the following steps: 100 parts by mass of ground phosphate rock, 1-4 parts by mass of phosphoric acid and 0.5-1 part by mass of calcium carbonate; mixing 0.5-3 parts by mass of sulfuric acid and 0.5-2 parts by mass of phosphate binder, pressing the mixture into balls, drying and cooling the balls to obtain the powdered rock phosphate balls. The invention uses phosphoric acid, sulfuric acid and a phosphate binder, wherein P is 2 O 5 Finally enters the furnace to participate in phosphorus preparation reaction, thereby improving P in the phosphate ore 2 O 5 The content of the phosphorus ore improves the grade of the phosphorus ore; meanwhile, the addition of sulfuric acid can further reduce the cost, and the sulfuric acid reacts with other substances such as calcium carbonate and the like to increase the strength of a final product. The added phosphoric acid and carbonate impurities in the phosphorite are subjected to chemical replacement reaction, and a double-roller mixer is utilized for mixing materials, so that CO harmful to the production of the electric furnace is fully released 2 And organic matter, the phosphoric acid added in the invention is waste phosphoric acid generated in the production process of yellow phosphorus, and the waste phosphoric acid is improvedThe utilization value of the phosphoric acid.)

1. A method for producing ground phosphate rock balls by utilizing ground phosphate rock is characterized by comprising the following steps:

100 parts by mass of ground phosphate rock, 1-4 parts by mass of phosphoric acid and 0.5-1 part by mass of calcium carbonate; mixing 0.5-3 parts by mass of sulfuric acid and 0.5-2 parts by mass of phosphate binder, pressing the mixture into balls, drying and cooling the balls to obtain the powdered rock phosphate balls.

2. The method of claim 1, wherein the powdered rock phosphate is screened powdered rock phosphate or ore fines remaining from production of concentrate from a mine;

the screening mesh number of the phosphate rock powder is 2-20 meshes.

3. The method according to claim 1, wherein the pressure of the press balls is 20 to 200 tons.

4. The method according to claim 1, wherein the temperature of the drying is 200 to 800 ℃.

5. The method according to claim 1, wherein the phosphoric acid is present in an amount of 10 to 50% by mass.

6. The method according to claim 1, wherein the sulfuric acid is present in an amount of 5 to 30% by mass.

7. The method as claimed in claim 1, wherein the phosphate binder is selected from one or more of magnesium phosphate, calcium phosphate or aluminium phosphate.

8. The method of claim 1, wherein the mixing is with a two-roll blender.

9. The method of claim 1, wherein the drying is drying with a high tower dryer.

Technical Field

The invention relates to the technical field of mineral processing, in particular to a method for producing ground phosphate rock balls by utilizing ground phosphate rock.

Background

In order to reduce the production cost of yellow phosphorus, the raw material of phosphorus ore used by yellow phosphorus manufacturers is mainly rich ore (P)₂O₅The mass fraction is more than 28%). After the mine is excessively mined for years, a few rich ores are left, and resources are seriously damaged. Most yellow phosphorus production enterprises in China only use lump ore and can burn medium-low grade powdered rock phosphate which can meet the charging requirement due to no pellet (lump)Junction devices, techniques, and are not practical. The enterprises which have mineral resources and depend on mining and marketing are mostly mining blocks and abandoning powder, and the resource waste is serious. In the past that the raw materials are excellent in quality and easy to obtain and low in price, enterprises can survive and develop in a low-technology, high-energy-consumption and high-waste extensive operation mode; at present and in the future where phosphorite resources are gradually depleted and the ore price is continuously increased, enterprises with large yellow phosphorus yield should develop and use a sintering technology, lump ore for producing yellow phosphorus is changed into a mixture of lump ore and sintered ore, namely, raw ore is screened, fine ore is sintered by adopting a novel sintering technology and then mixed with the screened lump ore to produce yellow phosphorus, and also powder ore with lower grade discarded in a mine and powder ore produced by transportation and drying can be subjected to ore dressing to improve grade and then sintered to be used for processing phosphate fertilizer and phosphorus products.

Disclosure of Invention

In view of the above, the technical problem to be solved by the present invention is to provide a method for producing powdered rock phosphate pellets by using powdered rock phosphate.

The invention provides a method for producing ground phosphate rock balls by utilizing ground phosphate rock, which comprises the following steps:

100 parts by mass of ground phosphate rock, 1-4 parts by mass of phosphoric acid and 0.5-1 part by mass of calcium carbonate; mixing 0.5-3 parts by mass of sulfuric acid and 0.5-2 parts by mass of phosphate binder, stirring, pressing, drying and cooling to obtain the powdered rock phosphate balls.

Preferably, the powdered rock phosphate is screened powdered rock phosphate or mineral powder left by producing concentrate on a mine;

the screening mesh number of the phosphate rock powder is 2-20 meshes.

Preferably, the pressure of the pressing ball is 20-200 tons.

Preferably, the drying temperature is 200-800 ℃.

Preferably, the mass percentage concentration of the phosphoric acid is 10-50%.

Preferably, the mass percentage concentration of the sulfuric acid is 5-30%.

Preferably, the phosphate binder is selected from one or more of magnesium phosphate, calcium phosphate or aluminum phosphate.

Preferably, the mixing is performed using a two-roll blender.

Preferably, the drying is drying by using a high tower dryer.

Compared with the prior art, the invention provides a method for producing ground phosphate rock balls by utilizing ground phosphate rock, which comprises the following steps: 100 parts by mass of ground phosphate rock, 1-4 parts by mass of phosphoric acid and 0.5-1 part by mass of calcium carbonate; mixing 0.5-3 parts by mass of sulfuric acid and 0.5-2 parts by mass of phosphate binder, pressing the mixture into balls, drying and cooling the balls to obtain the powdered rock phosphate balls. The invention adopts phosphoric acid, sulfuric acid and phosphate adhesive, and P in the phosphoric acid and phosphate adhesive₂O₅Finally enters the furnace to participate in phosphorus preparation reaction, thereby improving P in the phosphate ore₂O₅The content of the phosphorus ore improves the grade of the phosphorus ore; meanwhile, the addition of sulfuric acid can further reduce the cost, and simultaneously, the sulfuric acid reacts with other substances such as calcium carbonate and the like to increase the strength of a final product. The added phosphoric acid and carbonate impurities in the phosphorite are subjected to chemical replacement reaction, and a double-roller mixer is utilized for mixing materials, so that CO harmful to the production of the electric furnace is fully released₂And organic matter, in the production of yellow phosphorus, every 1% of CO in the material is reduced₂The power consumption of the electric furnace can be reduced by 190 ℃, the coke consumption is reduced by 29 kg, and the production cost of enterprises can be greatly reduced; the phosphoric acid added in the invention is waste phosphoric acid generated in the yellow phosphorus production process, and the waste phosphoric acid is used for producing the ground phosphate rock balls, so that the utilization value of the waste phosphoric acid is improved.

Detailed Description

The invention provides a method for producing ground phosphate rock balls by utilizing ground phosphate rock, and a person skilled in the art can use the content of the text for reference and appropriately improve the process parameters to realize the method. It is expressly intended that all such similar substitutes and modifications apparent to those skilled in the art are deemed to be within the scope of the invention. While the methods and applications of this invention have been described in terms of preferred embodiments, it will be apparent to those of ordinary skill in the art that variations and modifications in the methods and applications described herein, as well as other suitable variations and combinations, may be made to implement and use the techniques of this invention without departing from the spirit and scope of the invention.

The invention provides a method for producing ground phosphate rock balls by utilizing ground phosphate rock, which comprises the following steps:

100 parts by mass of ground phosphate rock, 1-4 parts by mass of phosphoric acid and 0.5-1 part by mass of calcium carbonate; mixing 0.5-3 parts by mass of sulfuric acid and 0.5-2 parts by mass of phosphate binder, pressing the mixture into balls, drying and cooling the balls to obtain the powdered rock phosphate balls.

The method for producing the powdered rock phosphate balls by utilizing the powdered rock phosphate provided by the invention comprises the steps of firstly, screening powdered rock phosphate screened by a production enterprise or mineral powder left by producing concentrate on a mine by utilizing a 2-15-mesh screen, directly using massive mineral aggregate for yellow phosphorus production, and feeding the screened powder into a material mixing step.

The ingredients of the invention are as follows: 100 parts of ground phosphate rock, 1-4 parts of phosphoric acid and 0.5-1 part of calcium carbonate; 0.5-3 parts by mass of sulfuric acid and 0.5-2 parts by mass of phosphate binder are mixed for blending, and then the mixture is uniformly stirred.

The ingredients of the invention comprise 100 parts of phosphate rock powder by mass; the powdered rock phosphate is not limited in the present invention and is well known to those skilled in the art. The ground phosphate rock is screened ground phosphate rock or mineral powder left by producing concentrate on a mine; the screening mesh number of the phosphate rock powder is 2-20 meshes.

The raw material comprises 1-4 parts by mass of phosphoric acid, specifically 1 part by mass, 2 parts by mass, 3 parts by mass or 4 parts by mass. Or a point value of any two of the above times.

The mass percentage concentration of the phosphoric acid is 10-50%; preferably 20 to 40%.

In the invention, the added phosphoric acid is waste phosphoric acid generated in the yellow phosphorus production process, and the waste phosphoric acid is used for producing the ground phosphate rock balls, so that the utilization value of the waste phosphoric acid is improved.

The raw material of the invention comprises 0.5-1 part by mass of calcium carbonate, preferably 0.6-0.9 part by mass. In the present invention, the source of the calcium carbonate is not limited, and the calcium carbonate may be commercially available, and the particle size of the calcium carbonate is preferably 400 to 800 mesh.

The raw material of the invention comprises 0.5-3 parts by mass of sulfuric acid; preferably 1 to 3 parts by mass; specifically, it may be 1 part by mass, 2 parts by mass or 3 parts by mass; or a point value of any two of the above times.

The mass percentage concentration of the sulfuric acid is preferably 5-30%; more preferably 10 to 25%.

The invention can reduce the consumption of phosphoric acid and production cost by adding the sulfuric acid, and can further improve the properties of the product such as strength and the like by adding the sulfuric acid and the calcium carbonate.

In the invention, the added phosphoric acid and carbonate impurities in the phosphorite are subjected to chemical replacement reaction, and a double-roller mixer is used for mixing materials, so that CO harmful to electric furnace production is fully released₂And organic matter, in the production of yellow phosphorus, every 1% of CO in the material is reduced₂The content and the power consumption of the electric furnace can be reduced by 190 ℃, the coke consumption is reduced by 29 kg, and the production cost of enterprises can be greatly reduced.

The raw materials of the invention comprise 0.5-2 parts by mass of phosphate adhesive; preferably 1 to 2 parts by mass.

The phosphate binder of the present invention is preferably selected from one or more of magnesium phosphate, calcium phosphate or aluminum phosphate. The source of the phosphate binder of the present invention is not limited and may be commercially available.

In the present invention, since phosphoric acid, sulfuric acid and phosphate binders are used, P in the phosphoric acid and phosphate binders₂O₅Finally enters the furnace to participate in phosphorus preparation reaction, thereby improving P in the phosphate ore₂O₅The content of the phosphorus ore improves the grade of the phosphorus ore.

The mixing according to the invention is preferably carried out using a two-roll mixer. The present invention is not limited to the specific operation of the mixing, and is well known to those skilled in the art.

The mixing is preferably stirring mixing, and when the stirring mixing is carried out, the ground phosphate rock, the phosphoric acid, the sulfuric acid and the phosphate adhesive can be uniformly mixed, and carbon dioxide and most of organic matters in carbonate in the mixed material can be removed.

And mixing to obtain the pressed ball. And (3) feeding the uniformly mixed powder into a ball press machine for ball pressing under the pressure of 20-200 tons. The pressure is preferably 30 to 180 tons.

And (5) after ball pressing and forming, sending the mixture into a dryer for drying. The present invention is not limited to the specific operation of the drying process, and those skilled in the art will be familiar with the operation.

And the drying is realized by adopting a high-tower dryer. The drying temperature is 200-800 ℃.

The drying is followed by cooling, and the specific operation of the cooling is not limited in the present invention, and is well known to those skilled in the art.

The invention provides a method for producing ground phosphate rock balls by utilizing ground phosphate rock, which comprises the following steps: 100 parts by mass of ground phosphate rock, 1-4 parts by mass of phosphoric acid and 0.5-1 part by mass of calcium carbonate; mixing 0.5-3 parts by mass of sulfuric acid and 0.5-2 parts by mass of phosphate binder, stirring, pressing, drying and cooling to obtain the powdered rock phosphate balls. The invention adopts phosphoric acid, sulfuric acid and phosphate adhesive, and P in the phosphoric acid and phosphate adhesive₂O₅Finally enters the furnace to participate in phosphorus preparation reaction, thereby improving P in the phosphate ore₂O₅The content of the phosphorus ore improves the grade of the phosphorus ore; meanwhile, the addition of sulfuric acid can further reduce the cost, and simultaneously, the sulfuric acid reacts with other substances such as calcium carbonate and the like to increase the strength of a final product. The added phosphoric acid and carbonate impurities in the phosphorite are subjected to chemical replacement reaction, and a double-roller mixer is utilized for mixing materials, so that CO harmful to the production of the electric furnace is fully released₂And organic matter, in the production of yellow phosphorus, every 1% of CO in the material is reduced₂The power consumption of the electric furnace can be reduced by 190 ℃, the coke consumption is reduced by 29 kg, and the production cost of enterprises can be greatly reduced; the phosphoric acid added in the invention is waste phosphoric acid generated in the yellow phosphorus production process, and the waste phosphoric acid is used for producing the ground phosphate rock balls, so that the utilization value of the waste phosphoric acid is improved.

In order to further illustrate the invention, the method for producing powdered rock phosphate pellets by using powdered rock phosphate according to the invention is described in detail with reference to the following examples. The total weight of the raw materials of the examples and the comparative examples is consistent and is 100 KG.