Additive for reinforcing reduction roasting of tin-containing materials to recover tin and method for separating and recovering tin from tin-containing materials

A technology of separation and recovery and additives, which is applied in the direction of improving process efficiency, etc., can solve the problems of high roasting temperature and long roasting time, and achieve the effects of efficient volatile recovery, low cost and reduced production cost

Active Publication Date: 2016-07-06
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the process of reducing, roasting, separating and recovering tin still exists at present, and the roasting temperature is high, a

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0028] Example 1:

[0029] Add additives to the tin-containing beneficiation tailings (TSn0.40%) with a particle size of -0.074mm accounting for 92% (the additives are composed of a mixture of 50% fluorite, 30% borax, and 20% sodium humate). Follow CaF 2 The molar ratio of Sn / Sn is 15:1. The additive is added to the finely ground material, mixed uniformly and then agglomerated and dried. The dried agglomerate is placed in a weak reducing atmosphere for reduction roasting, and the roasting temperature is 600°C. The roasting atmosphere is CO / (CO+CO 2 )=10%, roasting time 120min. The tin content in the roasting slag was analyzed to be 0.03%, and the tin volatilization rate was calculated to be 91.1%.

Example Embodiment

[0030] Example 2:

[0031] The tin iron ore (TSn0.71%) is crushed and ground to a particle size of -0.074mm, which accounts for 83%. Add additives to the finely ground materials (the additives are composed of 50% fluorite, 20% borax, 30% sodium humate mixed composition), the additive amount is in accordance with CaF 2 The molar ratio of Sn / Sn is 11:1. The additive is added to the finely ground material, mixed uniformly and then agglomerated and dried. The dried agglomerate is placed in a weak reducing atmosphere for reduction roasting at a roasting temperature of 725°C, The roasting atmosphere is CO / (CO+CO 2 )=30%, roasting time 15min. The tin content in the roasting slag is analyzed to be 0.08%, and the tin volatilization rate is calculated to be 90.2%.

Example Embodiment

[0032] Example 3:

[0033] The tin iron ore (TSn0.71%) is crushed and ground to a particle size of -0.074mm, which accounts for 83%. Add additives to the finely ground material (additives are based on the mass percentage of 60% fluorite, 20% borax, 20% % Sodium humate), the additive amount is in accordance with CaF 2 The molar ratio of Sn / Sn is 5:1. The additive is added to the finely ground material, mixed uniformly, agglomerated and dried, and the dried agglomerate is placed in a weak reducing atmosphere for reduction roasting at a roasting temperature of 750°C, The roasting atmosphere is CO / (CO+CO 2 )=19%, calcination time 55min. The tin content in the roasting slag was analyzed to be 0.07%, and the tin volatilization rate was calculated to be 91.7%.

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Abstract

The invention discloses an additive for reinforcing reduction roasting of tin-containing materials to recover tin and a method for separating and recovering the tin from the tin-containing materials. The additive comprises main components such as fluorite, borax, sodium humate and the like. The method for applying the additive to reinforcement of reduction roasting of the tin-containing materials to recover the tin comprises steps as follows: the tin-containing materials are ground, crushed and then mixed with the additive for agglomeration; obtained agglomerates are dried and then placed in a reducing atmosphere for high-temperature roasting, and volatile tin fluorides are recovered. According to the method, through use of the additive, the reduction roasting temperature can be effectively reduced, the separation and recovery rate of the tin can be increased, and the method is applicable to treatment of various tin-containing materials difficult to treat, is particularly applicable to treatment of tin-containing tailings, iron-tin ores, tin smelting slag and the like which have iron-tin minerals closely disseminated and associated and are difficult to separate through conventional mineral separation means, is simple in technology and low in cost, and meets industrial production.

Description

technical field [0001] The invention relates to an additive for strengthening the reduction roasting of tin-containing materials to separate and recover tin, and a method for separating and recovering tin from tin-containing materials, belonging to the technical field of tin mineral processing. Background technique [0002] my country has rich reserves of tin ore resources, but most of them are vein tin deposits with deep burial and overlapping distribution, so mining and sorting are difficult and costly. More than 90% of tin deposits in China are dominated by vein tin deposits, and the types of associated and symbiotic resources are complex, making comprehensive utilization difficult. With the depletion of high-quality and easy-to-select placer tin ore resources in China, the mineable grade of tin ore is declining year by year. At present, the mineable grade of domestic placer tin ore has dropped to 0.009%-0.03%, while the mineable grade of vein tin ore is around 0.2%. . ...

Claims

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Application Information

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IPC IPC(8): C22B1/02C22B25/02
CPCC22B1/02C22B25/02Y02P10/20
Inventor 张元波苏子键李光辉姜涛陈迎明刘兵兵范晓慧彭志伟黄柱成郭宇峰杨永斌李骞陈许玲甘敏徐斌张鑫杜明辉刘继成欧阳学臻
Owner CENT SOUTH UNIV
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