Method for producing powdered rock phosphate balls by using powdered rock phosphate

Abstract

The invention provides a method for producing powdered rock phosphate balls from powdered rock phosphate. The method comprises the following steps: mixing 100 parts by mass of powdered rock phosphate,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 a phosphate adhesive, pressing into balls, drying and cooling to obtain powdered rock phosphate balls. According to the method, phosphoric acid, sulfuric acid and a phosphate adhesive are adopted, and P2O5 in the phosphoric acid, sulfuric acid and the phosphate adhesive finally enters the furnace to participate in phosphorus production reaction, so that the content of P2O5 in the phosphate ore is increased, and the grade of the phosphate oreis improved, meanwhile, sulfuric acid is added to further reduce the cost, and reacts with calcium carbonate and other substances to enhance the strength of the final product. The added phosphoric acid and carbonate impurities in phosphorite are subjected to a chemical replacement reaction, a double-roller mixer is used for mixing, CO2 and organic matter harmful to electric furnace production arefully released, the added phosphoric acid is waste phosphoric acid generated in the yellow phosphorus production process, and the utilization value of the waste phosphoric acid is increased.

Description

technical field [0001] The invention relates to the technical field of mineral processing, in particular to a method for producing phosphate rock powder balls from phosphate rock powder. Background technique [0002] In order to reduce the production cost of yellow phosphorus, the phosphate rock raw materials used by yellow phosphorus manufacturers are mainly rich ore (P 2 o 5 Quality score > 28%). After several years of excessive and indiscriminate mining, there are not many rich ore left, and the resources are seriously damaged. Most yellow phosphorus production enterprises in China only use lump ore, and they cannot use medium and low-grade phosphate rock powder that can meet the requirements for furnace feeding because there is no pellet (block) sintering device and technology. Most of the enterprises with mineral resources and relying on mining and marketing mine blocks and discard powder, which is a serious waste of resources. In the past when raw materials were...

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Problems solved by technology

[0007] (1) Disadvantages of clay as a binder: ① It reduces the grade of phosphate rock, such as raw ore P 2 o 5 The mass fraction is 25%, and after adding 8% clay to make the ball, the P in the dry ball 2 o 5 The mass fraction drops to 23%; ②The amount of slag increases to produce yellow phosphorus, which is put into the furnace phosphorus ore. 2 o 5 If the mass fraction is 25%, if sintered balls with clay are used instead, the raw material quality of phosphate rock will increase from the original 1t to 1.3-1.5t, and the clay in the sintered balls will eventually be discharged in the form of slag, and the slag quality will increase from the original 1t to 1.9-2.0t; ③The economic benefit is reduced, and the power consumption is calculated by the amount of chemical materials. The heat loss from the clay (slag) is converted into power consumption of about 1000kw / h / t, and the loss of phosphorus due to the increase in the amount of slag also increases , the economic benefit is reduced by about 500 yuan / t;

[0008] (2) The granulation production efficiency of the disc granulator is low, there are many equipment failures, the dust content in the granulation site is high, and the operating environment is poor;

[0009] (3) Disadvantages of belt sintering phosphate rock: the strength of phosphate rock sintered balls is proportional to the sintering temperature, because the material (steel) of the belt sintering machine is not high in heat resistance, so the strength of sintered balls often depends on the sintering temperature. In addition, the sintering heat loss of the belt sintering machine is large, which makes the consumption of yellow phosphorus tail gas partial (150Nm 3 / t mine), and the device investment is also high

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