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Method for determining content of tin in tungsten concentrate

A technology for tungsten concentrate and content, applied in the field of laboratory analysis, can solve the problems of complex determination process of potassium iodate volumetric method, high test cost, inaccurate determination, etc., and achieve complete and complete separation of tungsten and tin, easy to popularize and use, and filter speed. improved effect

Inactive Publication Date: 2014-12-17
HUNAN NONFERROUS METALS XINTIANLING WOLFRAM MINE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Aiming at the conventional methods for the determination of tin content in tungsten concentrates in the prior art, such as the potassium iodate volumetric method, the determination process is complicated and the determination is inaccurate; while the atomic absorption needs to use expensive advanced instruments, and the test cost is high; this paper The purpose of the invention is to provide a method with simple test process, low cost and fast and accurate determination of tin content in tungsten concentrate

Method used

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  • Method for determining content of tin in tungsten concentrate
  • Method for determining content of tin in tungsten concentrate
  • Method for determining content of tin in tungsten concentrate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] Samples to be tested: GSBD-45001-89 wolframite, XQ011301036 scheelite concentrate and XQ011301039 scheelite concentrate.

[0047] Preparation of compound melting agent: Take 20g of anhydrous borax, 10g of boric acid and 90g of zinc powder, grind them and mix them evenly.

[0048] Analysis steps:

[0049] Weigh 1.0000g sample (with the sample as reagent blank) and place it in a 10mL corundum crucible or porcelain crucible filled with 4g of mixed flux in advance, cover with 1g of mixed flux and 0.4g of potassium chloride (potassium chloride prevents metal liquid splashing), placed in an 800°C muffle furnace to melt for 20 minutes, taken out, and cooled. Use 50mL of 80°C hot hydrochloric acid with a concentration of 9mol / L to leaching the crucible completely, let the leaching solution cool down, and add 0.1g of potassium permanganate to oxidize the precipitate under low temperature conditions. Filter with fast filter paper, wash the beaker and funnel with dilute hydrochl...

Embodiment 2

[0066] Sample: GSBD-45001-89 Wolframite

[0067] Preparation of compound melting agent: take 23g of anhydrous borax, 13g of boric acid and 82g of zinc powder, grind them and mix them evenly.

[0068] Analysis steps:

[0069] Weigh 0.4000g sample (with the sample as reagent blank) and place it in a 10mL corundum crucible or porcelain crucible filled with 3g mixed flux in advance, cover with 0.5g mixed flux and 0.2g potassium chloride (when potassium chloride prevents high temperature dissolution metal liquid splashing), placed in a muffle furnace at 820°C for 22 minutes, taken out, and cooled. Use 30mL of 84°C hot hydrochloric acid with a concentration of 8.5mol / L to leaching the crucible completely, let the leaching solution cool down, and add 0.06g of potassium permanganate to oxidize the precipitate under low temperature conditions. Filter with fast filter paper, wash the beaker and funnel with dilute hydrochloric acid washing solution with a concentration of 2% by mass, a...

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Abstract

The invention discloses a method for determining the content of tin in a tungsten concentrate. The method comprises the following steps: smelting a tungsten concentrate sample through a composite smelting agent consisting of anhydrous borax, boric acid and zinc powder, leaching through thick hydrochloric acid, oxidizing leachate, filtering and separating to obtain a tin-containing solution, reducing the tin-containing solution through iron powder, titrating a reaction solution to an endpoint through a potassium iodate standard solution by taking a starch-potassium iodide solution as an indicator, and calculating the mass percentage of tin in the tungsten concentrate according to the titration result. The determination method is simple in process, low in cost, and capable of fast and accurately determining the content of tin in the tungsten concentrate and overcoming the defects of conventional methods for determining tin in the tungsten concentrate in the prior art, for instance, a potassium iodate volumetric method is complicated in determination process and inaccurate in determination, and an atomic absorption spectrometry method needs expensive advanced instruments and is large in testing cost.

Description

technical field [0001] The invention relates to a method for measuring tin content in tungsten concentrate, which belongs to the field of laboratory analysis. Background technique [0002] In the smelting process of tungsten concentrate, the existence of tin will have a serious impact on its mechanical and physical properties. According to the requirements of YS / T 231-2007, the product quality standards submitted during the sales of tungsten concentrate must be reported as tungsten concentrate The mass fraction of tin. [0003] At present, for the determination of tin in tungsten concentrate, potassium iodate volumetric method and hydride generator atomic absorption spectrometry are mainly used. Therefore, most companies use these two methods for analysis. Potassium iodate volumetric method is mainly used in the pre-treatment of the sample, generally using simple zinc powder and salts to decompose, and then adding an oxidizing agent to oxidize the tungsten blue. The exist...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/79G01N1/34
Inventor 张艳吴远婵曹年凤
Owner HUNAN NONFERROUS METALS XINTIANLING WOLFRAM MINE
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