Introduction to phosphogypsum


Phosphogypsum refers to the solid waste in the production of phosphoric acid with sulfuric acid phosphate rock, the main component is calcium sulfate. Phosphorus gypsum is generally powder, the appearance is gray, grayish yellow, light green and other colors, contains organic phosphorus, sulfur compounds, bulk density 0.733-0.88g/cm3, particle diameter is generally 5 ~ 15um, the main component is calcium sulfate dihydrate, content counted about 70 ~ 90%, among which secondary ingredients contained vary with different phosphate rock origin, usually contain rock components Ca, Mg phosphate and silicate. China's current annual emissions of phosphogypsum is about 20 million tons, the cumulative displacement of nearly 100 million tons, is the largest displacement of gypsum waste, gypsum waste had occupied large number of soil and formed waste slag hill, which seriously polluted the environment.

Application of phosphogypsum

1. Widely used in the field of building materials, large consumptive amount of phosphogypsum and its mature technology application route is carried out by grinding mill. The fine powder of gypsum plaster could be used as building materials in the manufacture of new products including gypsum instead of natural gypsum cement retarder production, refining building gypsum powder, production of plaster board, gypsum block and the like.

2. phosphogypsum rendered acidic, is very rich in sulfur, calcium, magnesium and other trace elements, in addition of widely used for construction, road and other purposes, but also for improvement of saline-alkali soil conditioner, played an important role in alleviate desertification. And moreover, phosphogypsum can also be prepared as a long-acting fertilizer and other fertilizer raw materials.

3.Phosphogypsum has a very large space for development. In industrial field, phosphogypsum used to produce sulfuric acid and cement ammonium sulfate, potassium sulfateand and other products through different processing methods, give full play to its special value.

Process flow of phosphogypsum pulverization

Phosphogypsum powder making machine model selection program

HLM currently widely used on the market as the first choice of vertical mill for phosphogypsum grinding, because of its low power consumption, feed size, easy to adjust the product fineness; the process is simple and other advantages to activated in non-metallic mineral including gypsum market.

Analysis on grinding mill models

Hong Cheng vertical grinding mill --HLM roller vertical milling integrate from drying, grinding, classification, transport as a whole, mainly used grinding and processing of cement, clinker, power plant desulfurization with lime powder, slag powder, manganese ore, gypsum, coal , barite, calcite and other materials. The mill mainly consist of main frame, feeder, classifier, blower, plumbing fixtures, hopper, electronic control systems, collection systems, etc., is a very advanced, efficient, energy-saving milling equipment.

Stage I: Crushing of raw materials

The large phosphogypsum material is crushed by the crusher to the feed fineness (15mm-50mm) that can enter the grinding mill.

Stage II: Grinding

The crushed phosphogypsum small materials are sent to the storage hopper by the elevator, and then sent to the grinding chamber of the mill evenly and quantitatively by the feeder for grinding.

Stage III: Classifying

The milled materials are graded by the grading system, and the unqualified powder is graded by the classifier and returned to the main machine for re grinding.

Stage V: Collection of finished products

The powder conforming to the fineness flows through the pipeline with the gas and enters the dust collector for separation and collection. The collected finished powder is sent to the finished product silo by the conveying device through the discharge port, and then packaged by the powder tanker or automatic packer.

Application examples of phosphogypsum powder processing

Model and number of this equipment: 1 set of HLMX1100

Processing raw material: phosphogypsum

Fineness of finished product: 800 mesh

Capacity: 8 T / h

Guilin Hongcheng phosphogypsum grinding mill has stable performance and excellent quality. It not only effectively solves the problem of phosphogypsum treatment, but also the processed gypsum powder will bring considerable economic benefits. The determination and launch of this phosphogypsum project can effectively open up the upstream, middle and downstream chains of phosphogypsum chemical industry, realize the effective balance between the development of phosphogypsum chemical industry and ecological environment, and promote the rapid development of phosphogypsum resource utilization industry. Grinding is an important section in phosphogypsum processing. Guilin Hongcheng gypsum special mill can realize efficient and stable crushing of phosphogypsum, which is an ideal pulverizing equipment choice.

Post time: Oct-22-2021