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A method for recovering tungsten from scheelite smelting slag

A technology of smelting slag and scheelite, applied in the field of tungsten recovery, can solve the problems of high cost, low recovery rate and poor effect

Active Publication Date: 2021-12-17
XIAMEN TUNGSTEN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In recent years, domestic tungsten beneficiation experts have come to our company for sampling experiments in batches, but the effect is poor, the cost is high, the recovery rate is low, and there is no value for beneficiation.

Method used

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  • A method for recovering tungsten from scheelite smelting slag
  • A method for recovering tungsten from scheelite smelting slag
  • A method for recovering tungsten from scheelite smelting slag

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Experimental program
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Effect test

Embodiment 1

[0037] Take 500 grams of sulfur and phosphorus mixed acid decomposition filter residues of different batches of scheelite after drying as the test sample, and the sample contains 0.65% tungsten.

[0038] First, use industrial waste hydrochloric acid to carry out acid leaching treatment on the sample, the liquid-solid volume ratio is 1:1, the pH is controlled at 1.5, the time of acid leaching treatment is 1.5 hours, and the acid leaching treatment is filtered to obtain the acid leaching filtrate and acid leaching Tailings, the acid leaching filtrate contains tungstic acid and calcium chloride; secondly, the acid leaching filter residue is subjected to alkali leaching treatment and filtered, the liquid-solid volume ratio is 1:1, the pH is controlled at 13, and the time of alkali leaching treatment is 1.5 hours After alkali leaching treatment, filter to obtain alkali leaching filtrate and alkali leaching filter residue, which contains sodium tungstate; finally, acid leaching filtr...

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Abstract

The present invention proposes a method for recovering tungsten from scheelite smelting slag. The method includes: (1) acid leaching treatment and filtering of scheelite smelting slag to obtain acid leaching filtrate and acid leaching tailings. The acid leaching filter slag contains Tungstic acid, calcium tungstate and unwashed phosphotungstic heteropolyacid; (2) pickling and filtering the pickling residue with waste hydrochloric acid to obtain pickling filtrate ① and pickling residue a, the pickling filtrate contains Tungstic acid; (3) alkali washing the filter residue a after pickling to obtain alkali cleaning filtrate ② and alkali cleaning filter residue b, and (4) mixing and reacting acid leaching filtrate ① and alkali leaching filtrate ② to obtain Artificial scheelite. The method has the advantages of simple process, short process, low cost, high tungsten recovery rate, less waste water and recyclable use, and finally the residual filter residue can be reused as a high value-added building material raw material.

Description

technical field [0001] The invention belongs to the field of chemical industry, in particular, the invention relates to a method for recovering tungsten from scheelite smelting slag. Background technique [0002] As the Ministry of Environmental Protection lists alkaline tungsten smelting slag as hazardous waste and controls it, domestic tungsten smelting enterprises are exploring and developing green and environmentally friendly tungsten smelting processes. Since 2011, our company has cooperated with universities to develop a synergistic leaching process of scheelite sulfur and phosphorus mixed acid. The biggest advantage of this process is: tungsten smelting slag mainly consists of calcium sulfate, which is a general solid waste. However, the tungsten content of the slag is higher than that of the alkali smelting slag, which is basically stable and controlled at 0.6-0.8%. The grade is two or three times higher than primary tungsten ore (0.1-0.3%). In recent years, domes...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B7/00C22B34/36
CPCC22B7/007C22B7/008C22B34/36Y02P10/20
Inventor 黄文璞
Owner XIAMEN TUNGSTEN