Kyanite group minerals belong to refractory silicate minerals with different properties and different beneficiation methods. Generally speaking, coarse-grained minerals are selected by hand, gravity and magnetic separation, in which jigging, heavy medium and shaking bed are the main gravity separation methods; fine-grained minerals are mainly flotation-based gravity separation, which mainly uses the density difference between kyanite group minerals and quartz, feldspar, mica, etc., and magnetic separation mainly uses its magnetic difference with biotite, bauxite, tourmaline, divinate them. Leave.
At present, in view of the characteristics of fine-grained distribution of useful minerals in kyanite mineral resources discovered in China, flotation-based combined beneficiation process is mostly adopted. Gravity separation and magnetic separation are often used for preconcentration in order to provide high-grade ore feeding for flotation. They can also be used to remove iron and titanium-reducing sillimanite, andalusite and kyanite from flotation concentrate, which are polycrystalline aluminosilicates with the same Si/o ratio. Minerals, their crystal structure is not only silica-oxygen tetrahedron unique to quartz, but also aluminium-oxygen octahedron unique to corundum. The research and practice show that the flotation of Kyanite group ores can be carried out under acidic, shouting and even neutral conditions. The optimum flotation pH value is related to the type and amount of collectors, and the flotation efficiency and selectivity in acidic medium are the best. Generally speaking, fatty acid collector is used in alkaline medium (pH 8.5~9.5); sulfonate collector is used in acidic medium (pH 3~1); and mixed collector is suitable for neutral medium (pH 6.5~7.5) for dispersing pulp and inhibiting iron ore, adding sodium hexametaphosphate and sodium pyrophosphate, inhibiting mica mostly using citric acid, inhibiting siliceous minerals such as feldspar and quartz mostly using. Proper desliming before flotation of sodium silicate 131 is beneficial to the improvement of flotation concentrate grade and recovery rate, and reverse flotation can also be used to remove mica, pyrophyllite, alumino-calcium phosphate stone, dolomite and iron-bearing substances before flotation. Oxyparaffin soap and hydroxamic acid are often used as collectors in reverse flotation.
Some concentrates contain very little W: It is difficult to remove impurities such as iron ore, mica and quartz by physical separation. In order to obtain high purity concentrate, chemical mineral processing is sometimes needed. The mixture of hydrofluoric acid and hydrochloric acid can be added and heated by steam, and the acid can be washed and deacidified after leaching for a period of time .
(2) Beneficiation Practice of Kyanite Mines
The National Engineering Research Center for Comprehensive Utilization of Non-metallic Mines, Zhengzhou Institute of Comprehensive Utilization of Minerals, Chinese Academy of Geological Sciences and its predecessor, the Institute of Comprehensive Utilization of Minerals, Ministry of Geology and Mineral Resources, began to study the processing and utilization of Kyanite Minerals in the early 1980s. They successively studied Shuyang Kyanite Mine, Weilu Kyanite Mine, Henan Cryptolite Mine and Shanliangfanshi Kyanite Mine in Jiangsu Province. Stone Mines, Jixi Sillimanite Mine in Heilongjiang Province, Pingshan Sillimanite Mine in Hebei Province, Neixiang Sillimanite Mine in Henan Province, Zhenping Sillimanite Mine in Henan Province, Tugui Ura Sillimanite Mine in Inner Mongolia, Putian Sillimanite Mine in Fujian Province, Xixia Andalusite Mine in Henan Province, Hunchun Andalusite Mine in Jilin Province, Xinerkuerle Andalusite Mine in Xinjiang, etc.
Flotation of EU ore by FFL flotation of Chao ore and tailings
Fig. 1 Processing Principle and Stem of a Low and Medium-grade Kyanite Ore
The grade of A1 office is 54.19%, the total recovery rate of Al2() 3 is 55%, and mica can be further recovered in flotation operation.
The largest andalusite deposit in China, the Bayinguoling andalusite deposit in Xinjiang, has a prospective resource of 2.13 xlO8 t. Through research, the primary granularity of andalusite is much larger than that of quartz and mica gangue minerals, and the distribution of andalusite and gangue minerals is much less compact than that of gangue minerals. A new technology of "aggregate" tailings throwing and direct crushing and classification of raw ore is put forward under the condition of relatively coarse granularity. The test confirms that (-5+0.5) mm grade adopts gravity separation-dry magnetic separation process, 0.5 mm grade adopts gravity separation-tailing-wet magnetic separation-gravity separation-dry high-intensity magnetic separation process, and medium ore adopts crushing-grade-dry magnetic separation process. Expanded beneficiation test has obtained excellent process indexes of andalusite concentrate rate 9.61%, A203 57.03%, andalusite mineral quantity 95.69%, recovery rate 69.73%. The process is simple and reliable. It solves the technical problem of separation and purification of coarse andalusite ore well. It is an innovative process. The 5-0.5 mm coarse andalusite product fills the gap of domestic non-coarse andalusite aggregate, and has been completed at present. Annual output 5 X 104 t
Beneficiation Plant of Andalusite Concentrate (1600 l/d Raw Ore).
For the Neixiang Sillimanite Mine in Henan Province, which belongs to garnet biotite schist, the production process is determined as crushing, grinding, weak magnetic separation, strong magnetic separation and desliming flotation. The principle process flow is shown in Figure 2. The process has already been put into production.
The development and utilization of Sanshi Mine have been studied experimentally.
mid-low grade kyanite ore is a kyanite quartz type ore, YueTieBing
After research and improvement, the original flotation process was improved. Fig. 1 was adopted.
The combined process flow of reflow and floatation is shown. The ore does not need all grinding, so it is improved.
The burial capacity of the original ore minimizes the overwear of kyanite.
Kyanite can be harvested under the condition of possible coarseness, thus ensuring the refinement of kyanite.
Ore grade and recovery. In Ran Shi gravity separation, some tailings are discarded and reduced.
The amount of ore in human flotation, and some rutile concentrate can be obtained by gravity separation to achieve comprehensive utilization.
The purpose of collecting useful minerals is to reduce the iron content in kyanite concentrate.
The quality of Kyanite concentrate is improved by the amount of Kyanite concentrate. Final kyanite concentrate