Maying Phosphorus Ore Dressing Plant

Ma camp phosphorus ore processing plant, located in Chengde City, Hebei Province, Ma Yingcun. Started production in 1976. The scale is to process 300,000 tons of raw ore annually, with an annual output of 51,800 tons of phosphorus concentrate and 56,200 tons of ferro- vanadium concentrate. It is a medium-sized mining and selection joint enterprise in northern China.

The ore is a basic rock type apatite deposit. The main rock series are basic heterogeneous rocks composed of plagioclase, Suchangyan and gabbro, which are mineralized by apatite and vanadium- titanium magnets. The shape of the ore body is more complicated.

The mine is divided into two belts, the south and the north. The north ore belt is 1100m long and 2500m wide. The south ore belt is 8000m long and 150m wide. The entire mining area contains an average of 7.5% P ₂ O ₅ .

The ore type is mainly bulk and disseminated vanadium-titanium magnetite-apatite ore, followed by phosphorus-depleted vanadium ilmenite. Apatite minerals are mainly composed of vanadium-containing magnetite, ilmenite and plagioclase feldspar, amphibole fiber, chlorite, pyrite, pyroxene.

Apatite is fluoroapatite. The particle size is coarser, and more than 90% is more than 0.2%. evenly distributed. Most of them are embedded in minerals such as vanadium iron magnetite, ilmenite, fibrinite and chlorite in the form of individuals or collections.

Vanadium-bearing magnetite This is the main iron mineral and the most vanadium-bearing mineral in the deposit. Single mineral analysis, containing V ₂ O ₅ 0.75%, Co 0.0032%, TFe 66.95%, TiO ₂ 5.42%. Its inlaid grain size is similar to that of apatite.

Ilmenite is the main titanium-containing mineral. Single mineral analysis, containing TiO ₂ 49.49%, V ₂ O ₅ 0.0065%, Co 0.006%. There are two kinds of mineral forms: one is irregular granular or granular aggregate embedded in gangue minerals, and the particle size is larger than 0.2mm, accounting for more than 90%; the other is grid-like, with smaller particle size.

Sulfur ( cobalt ) The sulphur content of the ore is not high, but the minerals formed are extremely complex. Wherein mainly pyrite, brass ore followed. Cobalt is present in pyrite in the form of isomorphism, accounting for about 30% to 40%.

In 1972, the Beijing Research Institute of Mining and Metallurgy conducted laboratory tests on three types of ore samples (surface samples, tunnel samples, and core samples). The chemical composition of the ore used was (%): P ₂ O ₅ 6.46 to 6.60, TiO ₂ 4.30 to 6.40, TFe 18.16 to 22.45, V ₂ O ₅ 0.14 to 0.21, and Co 0.0073 to 0.0085. Using flotation-magnetic separation-flotation combined process, phosphorus concentrate (grade 35% P ₂ O ₅ , recovery rate 94%) and vanadium iron concentrate (containing Fe60%, V ₂ O ₅ 0.65%~) 0.7%; recovery rates are 50% to 60% and 70% to 80%, respectively, sulphur-cobalt concentrate (including S35%, Co0.25% to 0.3%; recovery rates of 70% and 30%, respectively) and titanium fines Mine (containing TiO ₂ is 45% to 48%, and the recovery is 40% to 50%).

However, in the actual production process of the concentrator, only phosphate concentrate and vanadium iron concentrate are recovered. Its selection process principle process is shown in Figure 1.

Figure 1 Flow chart of the process principle of the concentrator

The production process of the concentrator is: ore or open-pit mining ore (maximum block size: 450mm). The ore is crushed to less than 15mm by two-stage closed-circuit crushing process, and then sent to a ball mill with a double-helix classifier to make a closed circuit. The mine has a graded Overflow with a particle size of -0.2 mm and is distributed to two systems for flotation. The flotation process is a rough selection, a sweep and a selection (the original design is four selections). The dosage of the agent is (kg/ton ore): sodium carbonate 2.63, water glass 0.91, oxidized paraffin soap 0.81. The flotation foam product is a phosphate concentrate, which is concentrated, filtered, dried and then shipped. The flotation tailings are de-sludged and magnetically selected to obtain vanadium-iron concentrate, which is concentrated and filtered to leave the factory. The magnetic separation tailings are sent to the tailings dam, and the clarified water is directly discharged.

The main technical and economic indicators of the concentrator, taking the best annual index from 1981 to 1983 as an example, are listed in the table below.

Table Main technical and economic indicators of the concentrator

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