A step-by-step grinding and reverse-reverse flotation process for processing siliceous-calcareous collophosite

Abstract

The invention discloses a substep ore grinding reverse-reverse direct flotation process for treating silico-calcium collophanite. The technological process is the substep ore grinding reverse-reverse direct flotation process, stage ore grinding is adopted, ore is ground into -0.074 mm in the first stage, a double reverse flotation process is adopted when the ore accounts for 50% to 70%, most of carbonate minerals of the raw ore are removed during first-stage reverse flotation, and most of quartz minerals of the raw ore are mainly removed during second-stage reverse flotation; the obtained rough concentrate is screened, oversized products are subjected to direct flotation fine selecting operation or used as blending ore of direct flotation concentrate, undersized products are subjected to second-stage ore grinding operation, the ore is ground in the second stage till the ore with the fineness of -0.074 mm accounts for 80% to 95%; flotation pulp gets into the direct flotation process, and most of silicate minerals in the flotation pulp are removed. The process mainly aims at the low-grade silico-calcium collophanite, especially silicon containing minerals are the quartz and aluminosilicate minerals, and the advantages of being stable in mineral processing flowsheet, good in separation effect, low in energy consumption and the like are achieved.

Description

technical field [0001] The invention belongs to the technical field of mineral processing, in particular to a step-by-step grinding and reverse-reverse flotation process for processing siliceous-calcareous colloidal phosphate rock. Background technique: [0002] In my country, phosphate rock resources are mainly concentrated in Yunnan, Guizhou, Sichuan, Hunan, Hubei and other places. They are mainly sedimentary phosphorites, and the resource base reserves rank second in the world. However, most of them are medium and low-grade phosphate rocks. Only by removing carbonate gangue and silicate gangue can the requirements of downstream operations be met. At present, for low-grade calcareous colloidal phosphate rock, there are mainly three flotation processes: forward-reverse flotation process, reverse-direct flotation process, and double reverse flotation process. Among them, the forward and reverse flotation process and the reverse flotation process It has good adaptability to s...

AI Technical Summary

Problems solved by technology

At present, for low-grade calcareous colloidal phosphate rock, there are mainly three flotation processes: forward-reverse flotation process, reverse-direct flotation process, and double reverse flotation process. Among them, the forward and reverse flotation process and the reverse flotation process It has good adaptability to siliceous calcareous collophosite, but it has the disadvantages of fine grinding fineness of raw ore, serious over-grinding phenomenon, and high energy consumption. The raw ore grinding fineness of double reverse flotation process is coarse It is relatively low, but this process has low sorting performance for ores with silicate minerals mainly composed of quartz, and poor sorting performance for ores with silicate minerals. The silicon-containing minerals of phosphate rock include both quartz minerals and a part of aluminosilicate minerals. If only reverse flotation and double reverse flotation processes are used, good results cannot be achieved.