Method for recovering cassiterite from scheelite smelting slag
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A technology for smelting slag and cassiterite, applied in chemical instruments and methods, wet separation, process efficiency improvement, etc., can solve the problems of metal loss, incompatibility, environmental damage, etc., and achieve less equipment, high recovery rate, investment low cost effect
Inactive Publication Date: 2018-03-30
GENERAL RESEARCH INSTITUTE FOR NONFERROUS METALS BEIJNG
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Most scheelite smelting enterprises carry out wet treatment to recover tungsten and store them up, which not only causes metal loss, but also causes huge damage to the environment
After retrieval, Luo Xianping's "Experimental Research on Comprehensive Recovery of Valuable Metals from Tungsten Smelting Slag" proposed to use flotation to recover tungsten, molybdenum and bismuth first, and then use gravity to recover tin to achieve better results, but This is only suitable for coarse tungsten smelting slag, not for finer smelting slag
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Embodiment 1
[0027] Mineral raw materials: select 50t / d (ton / day) scheelite smelting slag for industrial test, the particle size of the material is all -37 microns, the tin content is 0.42%, the gangue mineral calcium oxide content is 48.87%, and the fluorite content is 20.32% , 3.86% calcite, 1.09% chlorite, and 25.44% other minerals.
[0028] Recycle through the following specific steps:
[0029] (1) Add 60 g / t of sodium polyacrylate aqueous solution with a weight percent concentration of 1% to the mixing tank, stir for 40 minutes at a speed of 2200 rpm, and fully disperse the fine-grained cassiterite minerals;
[0030] (2) Use a water analyzer to classify the product of step (1) with a size of 19 μm, and put the fine-grained cassiterite of the product +19 μm into the fine mud shaker for two gravity separation operations to obtain tin coarse concentrate 1,-19 μm The fine-grained cassiterite is fed into the centrifugal concentrator for two gravity separation operations to obtain tin coar...
Embodiment 2
[0035] Mineral raw materials: select 100t / d scheelite smelting slag for industrial test, the particle size of the material is all -37 microns, the tin content is 0.81%, the gangue mineral calcium oxide content is 42.56%, the fluorite content is 18.52%, and the calcite content is 1.97%. The content of chlorite is 3.98%, and other minerals account for 32.97%.
[0036] Recycle through the following specific steps:
[0037] (1) Add 100g / t, 2% sodium polyacrylate aqueous solution by weight to the mixing tank, stir for 50 minutes at a speed of 2600 rpm, and fully disperse the fine-grained cassiterite minerals;
[0038] (2) Use a water analyzer to classify the product of step (1) with a size of 19 μm, and put the fine-grained cassiterite of the product +19 μm into the fine mud shaker for two gravity separation operations to obtain tin coarse concentrate 1,-19 μm The fine-grained cassiterite is fed into the centrifugal concentrator for two gravity separation operations to obtain tin ...
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Abstract
The invention belongs to the technical field of mineral recovery and particularly relates to a method for recovering cassiterite from scheelite smelting slag. According to the method, sodium polyacrylate is used as a micro-fine-grained cassiterite mineral dispersant, then micro-fine-grained cassiterite minerals are classified, then the classified micro-fine-grained cassiterite minerals are subjected to gravity separation and recovery through a micro-fine mud shaking table and a centrifugal separator, two kinds of coarse-grained cassiterite concentrates different in size fraction are obtained,finally the coarse-grained cassiterite concentrates are subjected to acid leaching purification, and tin concentrates are obtained. By the adoption of the method, the cassiterite can be recovered fromthe scheelite smelting slag, and the method is especially suitable for recovery of the micro-fined-grained cassiterite of negative 19 micrometers in the cassiterite smelting slag; the method is efficient, environmentally-friendly and free of waste water, and liquid in the gravity separation and acid leaching processes is used in a circulating manner; and the technological process is short, the number of equipment is small, the cassiterite recovery rate is high, and the industrial application investment cost is low.
Description
technical field [0001] The invention belongs to the technical field of mineral recovery, in particular to a method for recovering cassiterite from scheelite smelting slag. Background technique [0002] my country is a big tungsten-producing country with the largest reserves of tungsten resources in the world, and its output and export volume both rank first in the world. Tungsten resources mainly exist in the form of wolframite and scheelite. With the decreasing amount of wolframite resources, mining scheelite resources has become the main mineral variety for tungsten resource mining. [0003] Scheelite smelting slag is made of scheelite concentrate as raw material, which is produced by caustic soda pressure cooking, and the slag particle size is fine (-400 mesh accounts for 100%). Most scheelite smelting enterprises carry out wet treatment of slag to recover tungsten and then stockpile it, which not only causes metal loss, but also causes huge damage to the environment. A...
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