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Processing method of tin concentrate containing tungsten

A treatment method, tin concentrate technology, applied in the field of valuable metal recovery, can solve the problem of insufficient separation of tungsten

Active Publication Date: 2019-05-24
CHINA ENFI ENGINEERING CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The present invention aims to provide a treatment method for tungsten-containing tin concentrate to solve the problem that tungsten cannot be sufficiently separated from tungsten-containing tin concentrate in the prior art

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Weigh 200g of raw ore, add 200mL of water, grind through a ball mill until the solid particle size is less than or equal to ≥90% of 45μm, and add 40g of sodium carbonate to the pulp. Add the adjusted mixed pulp into the autoclave, raise the temperature to 180°C, and the pressure inside the autoclave is 0.8MPa at this time, keep the temperature and react for 5 hours under stirring, then cool down and release the pressure. The leaching residue after filtering and washing is dried to obtain tin concentrate, and hydrochloric acid is added to the leaching solution to adjust the pH value to 4 to obtain an acidic leaching solution. Then add solid sodium hydroxide to the acidic leaching solution to adjust the pH value to 9 to obtain an alkaline leaching solution. Then add saturated calcium chloride solution to the alkaline leaching solution, the amount added is by weight W:CaCl 2 =1:1, artificial scheelite is precipitated at a reaction temperature of 85°C. The filter cake aft...

Embodiment 2

[0045] Weigh 200g of raw ore, add 300mL of water, grind through a ball mill until the solid particle size is less than or equal to ≥98% of 45μm, and add 80g of sodium carbonate to the pulp. Put the adjusted ore slurry into the autoclave, raise the temperature to 220°C, the pressure inside the autoclave is 2.0MPa at this time, keep the temperature and react for 1h under stirring, then cool down and release the pressure. The leached slag after filtering and washing is dried to obtain tin concentrate; hydrochloric acid is added to the leaching solution, and the pH value is adjusted to 3 to obtain an acidic leaching solution. Then add solid sodium hydroxide to the acidic leaching solution to adjust the pH value to 11 to obtain an alkaline leaching solution. Then add saturated calcium chloride solution to the alkaline leaching solution, the amount added is by weight W:CaCl 2 =1:1.3, the artificial scheelite is precipitated at the reaction temperature of 95°C. The filter cake afte...

Embodiment 3

[0048] Weigh 200g of raw ore, add 160mL of water, grind by ball mill until the solid particle size is less than or equal to ≥88% of 45μm, and add 50g of sodium carbonate to the pulp. Put the adjusted ore slurry into the autoclave, raise the temperature to 200°C, and the pressure inside the autoclave is 1.2MPa at this time, keep the temperature and react for 4 hours under stirring, then cool down and release the pressure. The leached slag after filtering and washing is dried to obtain tin concentrate; hydrochloric acid is added to the leaching solution, and the pH value is adjusted to 4 to obtain an acidic leaching solution. Then add solid sodium hydroxide to the acidic leaching solution to adjust the pH value to 9 to obtain an alkaline leaching solution. Then add saturated calcium chloride solution to the alkaline leaching solution, the amount added is by weight W:CaCl 2 =1:1.1, artificial scheelite is precipitated at a reaction temperature of 95°C. The filter cake after liq...

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PUM

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Abstract

The invention discloses a processing method of a tungsten-containing tin concentrate. The processing method comprises the following steps: preparing pulp of the tin concentrate, and mixing the pulp and soluble carbonate to obtain mixed pulp; enabling the mixed pulp to carry out leaching reaction to obtain tungsten-containing leaching residues and a leaching solution; regulating a pH value of the leaching solution to be acid to obtain an acid leaching solution; regulating a pH value of the leaching solution to be alkaline to obtain an alkaline leaching solution; and adding the soluble carbonate in the alkaline leaching solution, and carrying out reaction to obtain artificial scheelite. According to the processing method, tungsten in the tungsten-containing tin concentrate can be converted to tungstate ions depending on the soluble carbonate to enter the leaching solution, thus the method can fully separate tungsten from the tungsten-containing tin concentrate; then, the pH value of the leaching solution is regulated to be acid, thus the tungstate ions in the leaching solution can be removed; while, the pH value of the leaching solution is regulated to be alkaline, full precipitation of the tungstate ions is facilitated, and the artificial scheelite is formed.

Description

technical field [0001] The invention relates to the field of recovery of valuable metals, in particular to a treatment method for tungsten-containing tin concentrate. Background technique [0002] The abundance of tungsten in the crust is 1.1×10 -6 , Wolframite and scheelite are the tungsten-containing minerals with the largest industrial value and the largest reserves that have been discovered in the world today. These two ores are often associated with magnetite, chalcopyrite, sphalerite and cassiterite in deposits. For the low-grade scheelite (tungsten-containing tin concentrate) associated with cassiterite, it is difficult to effectively separate the two with the existing technology. [0003] The existing methods for separating and extracting tungsten from tungsten-containing tin concentrate mainly include acid decomposition method, soluble carbonate sintering-water leaching method and sodium hydroxide pressure leaching method. [0004] Acid decomposition method can p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B34/36C22B3/04C22B3/44
CPCC22B3/04C22B3/44C22B34/36Y02P10/20
Inventor 邱爽覃波杜国山周文龙张军
Owner CHINA ENFI ENGINEERING CORPORATION
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