Phosphorite superfine grinding solution

2017-05-03

Phosphorite, phosphate rock or rock phosphate is a non-detrital sedimentary rock which contains high amounts of phosphate minerals. The phosphate content of phosphorite (or grade of phosphate rock) varies strongly, from 4% to 20% phosphorus pentoxide (P2O5). Marketed phosphate rock is enriched ("beneficiated") to at least 28%, often more than 30% P2O5. This occurs through washing, screening, de-liming, magnetic separation or flotation. By comparison, the average phosphorus content of sedimentary rocks is less than 0.2%. The phosphate is present as fluorapatite Ca5(PO4)3F typically in cryptocrystalline masses (grain sizes < 1 μm) referred to as collophane-sedimentary apatite deposits of uncertain origin. It is also present as hydroxyapatite Ca5(PO4)3OH or Ca10(PO4)6(OH)2, which is often dissolved from vertebrate bones and teeth, whereas fluorapatite can originate from hydrothermal veins. Other sources also include chemically dissolved phosphate minerals from igneous and metamorphic rocks. Phosphorite deposits often occur in extensive layers, which cumulatively cover tens of thousands of square kilometres of the Earth's crust.

Limestones and mudstones are common phosphate-bearing rocks. Phosphate rich sedimentary rocks can occur in dark brown to black beds, ranging from centimeter sized laminae to beds that are several meters in thickness. Although these thick beds can exist they are rarely only composed of phosphatic sedimentary rocks. Phosphatic sedimentary rocks are commonly accompanied by or interbedded with shales, cherts, limestone, dolomites and sometimes sandstone. These layers contain the same textures and structures as fine-grained limestones and may represent diagenetic replacements of carbonate minerals by phosphates. They also can be composed of peloids, ooids, fossils, and clasts that are made up of apatite. There are some phosphorites that are very small and have no distinctive granular textures. This means that their textures are similar to that of collophane, or fine micrite-like texture. Phosphatic grains may be accompanied by organic matter, clay minerals, silt sized detrital grains, and pyrite. Peloidal or pelletal phosphorites occur normally; whereas oolitic phosphorites are not common.

Phosphorites are known from Proterozoic banded iron formations in Australia, but are more common from Paleozoic and Cenozoic sediments. The Permian Phosphoria Formation of the western United States represents some 15 million years of sedimentation. It reaches a thickness of 420 metres and covers an area of 350,000 km2. Commercially mined phosphorites occur in France, Belgium, Spain, Morocco, Tunisia and Algeria. In the United States phosphorites have been mined in Florida, Tennessee, Wyoming, Utah, Idaho and Kansas.


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The ACM/A series are highly efficient super-fine punch-action mechanical micro grinding machines of performing the complete process of material grinding, separation and making of the finished product within the same tightly integrated system.

1. Built-in separation mechanism-preventing over-grinding.

2. Able to produce uniform granules of required sizes by adjusting the speed of the stage-separation wheel(s) or by adjusting the strength of the blower(s).

3. Powerful blowing and strong self-cooling capability, suitable for grinding heat-sensitive materials.

4. Different grinding accessories/devices are used according to the hardness of the material being ground; different types of materials (alloyed carbon steel, stainless steel, ceramics etc) are available for the Machine's inner linings and product extracting system, meeting the needs of different industries.

5. Both manual and programmable auto-controlled machines available.

The machine is suitable for super-fine grinding of various types of brittle materials. Material hardness (Mohs scale)<4, moisture contents<10%, input size 5-200mm (as decided by the model of the machine and material hardness). The machine is widely used coating materials and other industries.

1. Our design idea is market-oriented and its goal is to increase customers’ satisfaction. Design according to the customers’ special requires. Achieve the perfect combination of rational investment and lower cost.
2.  According to related national standard strictly, we guarantee stable and reliable product quality with superb technique and technology.
3.  Control the production and examination of the parts and the whole machine strictly.
4.  The period of quality guarantee of the equipment is one year, but the whole machine is maintained for whole life. If we receive complaint from customers, we will respond immediately. And if necessary, we will send someone to the field at once.
5.  When technical breakthrough and improvement happen, we will do the correction and upgrade for customers with cost price only if customers will.
6.  Supply the blueprint of the product line and equipment details for free.

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