Technical method and process for comprehensive utilization of feldspar minerals

1. Comprehensive utilization technology and process of feldspar minerals

The main deposits of feldspar are pegmatite, weathered granite , fine-grained rock (semi-weathered granite), in addition to feldspathic pottery, potassic rhyolite, albite associated with serpentinite , and nepheline flash Changyan and Baigangyan. Depending on the type of feldspar deposit and the nature of the ore, different methods of beneficiation are required. Generally, the crushing and grinding is carried out after the hand picking, and then the iron mineral is removed by magnetic separation. In recent years, with the reduction of rich feldspar mines and the development of comprehensive recovery of feldspar technology in other mines, more complicated sorting operations such as re-election, electric selection and flotation have been introduced to remove associated minerals such as quartz and mica . To obtain a feldspar concentrate rich in potassium and sodium and to recycle high quality products.

According to the ore nature of the feldspar mine, the general selection process principle is as follows:

(1) High-quality feldspar produced in pegmatite: hand selection → crushing → grinding (or water milling) → classification.

(2) Feldspar in weathered granite: crushing→grinding→grading→flotation (except iron and mica)→flotation (separation of quartz and feldspar).

(3) Feldspar in fine-grained rock (generally containing mica, sometimes containing iron): crushing → grinding → screening → magnetic separation.

(4) feldspar sand mine: water elution mud → sieving (or flotation separation quartz, etc.).

2. Development production examples

(1) Shandong Xintai Changshi Mine

The mine is located in Dongshi shed and north of Shishi shed in Yangliu Township, Xintai County, Shandong Province. The deposit is a metamorphic schist system. The ore is mainly potassium feldspar (blocky), and also contains albite, quartz, muscovite, etc. .

Due to its good quality of raw ore, Xintai feldspar mine can be industrially demanded only by hand selection in the mine or by powdering after crushing and grinding (water milling). The processing process of mineral processing is as follows:

Xintai feldspar mineral product specifications

Main technical and economic indicators of Xintai feldspar mine

(3) Yunnan old feldspar mine

The mine is located in Baimazhai, Gejiu City, Yunnan Province. The main minerals in the ore include kaolin (0.9mm), quartz (>1.2mm) and biotite (<1.2mm).

The Gejiu feldspar mine was built in the early 1970s. The granite magneto-electric concentrating plant with dry grinding and dry selection process separates the three minerals of feldspar, quartz and mica to obtain feldspar concentrate. The process is as follows:

The specifications of the old feldspar mineral products are as follows:

Gejiu feldspar mineral product specifications

The technical and economic indicators of the old feldspar ore dressing are as follows:

Gejiu feldspar ore dressing technical and economic indicators

(4) Hubei Changshi Mine

The main mineral components of the ore are: micro-plagioclase (39.9%), albite (19.6%), quartz (32.8%), mica (7.8%, mainly muscovite), and a small amount of schist debris (1.5%). ), garnet (0.08%) and continuous minerals (2.31%).

The semi-industrial test process of Hubei Changshi Mine is as follows:

The chemical composition of the semi-industrial test products of Hubei Changshi Mine is as follows:

Semi-industrial test feldspar and comprehensive recycling product chemical composition of Hubei Changshi Mine

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