Method for preparing metallic tin and sodium silicate by utilizing high-silicon type cassiterite concentrate

A technology of metal tin and cassiterite, which is applied in the field of preparing metal tin and sodium silicate, can solve the problems of high refractory requirements for roasting equipment, affecting the physical and mental health of operators, and no production reports, etc., achieving low cost and effective separation , Environmentally friendly effect

Active Publication Date: 2014-11-19
CENT SOUTH UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there are still disadvantages such as long tin smelting time and high smelting temperature.
[0006] 4) The non-patent literature "physicochemical aspects of carbothermic reduction of cassiterite in the ionic melt, Russian Journal of Non-Ferrous Metals, 2009, vol.50, No.6, pp.596-599" reports the use of cassiterite and sodium nitrate , Sodium carbonate as raw material, low-sulfur coal as reducing agent, the method of preparing metal tin by strengthening reduction in molten state, but no production report has been seen so far
Its significant disadvantages are: the use of NaNO 3 Low melting point substances are roasted in a molten state, which not only requires high refractory materials for the roasting equi

Method used

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  • Method for preparing metallic tin and sodium silicate by utilizing high-silicon type cassiterite concentrate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Finely ground cassiterite concentrate (SnO 2 content of 72.5%), sodium carbonate according to the molar ratio of silicon dioxide and sodium carbonate in cassiterite concentrate is 1:1.05 for batching, after mixing, agglomerates, dried, and then put the dry agglomerates into a mixture of CO and CO 2 Heating and roasting in a reducing atmosphere composed of a mixed gas, where [CO / (CO+CO 2 )] × 100%=50%, the roasting temperature is 800°C, and the time is 90min; after the roasting mass is cooled, it is successively ground and filtered to obtain sodium silicate solution and metal tin slag, and the content of metal Sn in the tin slag is 97.4%, and the recovery rate of Sn was 97.2%.

Embodiment 2

[0044] Finely ground cassiterite concentrate (SnO 2 content 88.2%), sodium carbonate according to the molar ratio of silicon dioxide and sodium carbonate in cassiterite concentrate is 1:1.5; after mixing, agglomerates, dried, and then put the dry agglomerates into a mixture of CO and CO 2 Heating and roasting in a reducing atmosphere composed of a mixed gas, where [CO / (CO+CO 2 )] × 100%=40%, the roasting temperature is 1000 DEG C, and the time is 30min; after the roasting agglomerate is cooled, it is successively ground, soaked and filtered to obtain sodium silicate solution and metal tin slag, and the content of metal Sn in the tin slag is 97.1%, and the recovery rate of Sn was 97.3%.

Embodiment 3

[0046] Finely ground cassiterite concentrate (SnO 2 Content is 59.6%), sodium carbonate according to the molar ratio of silicon dioxide and sodium carbonate in cassiterite concentrate is 1:1.2 carry out batching; Agglomerate after mixing, dry, then put dry agglomerate into by CO and CO 2 Heating and roasting in a reducing atmosphere composed of a mixed gas, where [CO / (CO+CO 2 )] × 100%=60%, the roasting temperature is 925 ℃, and the time is 60min; after the roasting agglomerate is cooled, it is successively ground and filtered to obtain sodium silicate solution and metal tin slag, and the content of metal Sn in the tin slag is 98.6%, and the recovery rate of Sn was 98.3%.

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Abstract

The invention discloses a method for preparing metallic tin and sodium silicate by utilizing high-silicon type cassiterite concentrate. The method comprises the following steps: mixing the cassiterite concentrate pretreated by oxidizing roasting-acid leaching with sodium carbonate in a certain proportion, and then pressing the mixture into block mass; carrying out reduction roasting at a proper temperature in a reducing atmosphere, then carrying out ball-milling and leaching, and carrying out filtering separation so as to obtain metallic tin residue and a sodium silicate solution. The method is simple in process flow, gentle in process condition, low in cost and environmentally friendly, and can be used for realizing efficient separation of tin and silicon in the high-silicon type cassiterite concentrate. And moreover, a byproduct sodium silicate is obtained, so that the comprehensive utilization of the high-silicon type cassiterite concentrate resource is realized.

Description

technical field [0001] The invention relates to a method for preparing metallic tin and sodium silicate by utilizing cassiterite concentrate, in particular to a method for preparing metallic tin and sodium silicate by reducing and roasting high-silicon type cassiterite concentrate, which belongs to non-ferrous smelting and chemical industry metallurgical field. Background technique [0002] Tin is one of the earliest metals utilized by humans and has a long history. From the Middle Ages to the beginning of the 19th century, the world’s tin production grew slowly, with an annual output of less than 10,000 tons; by the beginning of the 20th century, the annual tin output exceeded 100,000 tons; at present, the world’s annual tin production and consumption are maintained at 350,000 to 400,000 tons Ton. The cassiterite concentrate used for tin smelting can remove most of sulfur, arsenic, antimony, iron, lead, manganese, bismuth, tungsten and other impurity elements after oxidat...

Claims

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Application Information

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IPC IPC(8): C22B1/11C22B1/16C22B1/02C22B25/00
Inventor 张元波李光辉姜涛刘兵兵苏子键陈军范晓慧黄柱成郭宇峰杨永斌李骞陈许玲彭志伟徐斌甘敏游志雄周友连刘臣杜明辉
Owner CENT SOUTH UNIV
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