Quick dissolution method for high-purity rhodium material

A material and fast technology, applied in the field of dissolved high-purity precious metal preparation and its aqueous solution, can solve the problems of low chlorination efficiency, low dissolution efficiency, long production cycle, etc., to save production cost, shorten production cycle, and reduce capital backlog. Effect

Inactive Publication Date: 2008-12-10
KUNMING INST OF PRECIOUS METALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Disadvantages: long cycle, many returning materials, low chlorination efficiency
Disadvantages: long cycle, high energy consumption, mass production and equipment materials are not easy to solve, sodium hydroxide is easy to introduce trace impurities
Disadvantages: long cycle, high energy consumption, and the dissolution of pure rhodium powder will introduce new impurities, which are not easy to re

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Embodiment one: take by weighing 10 grams of pure rhodium powder (99.99%), measure 300ml concentration and be 36%~38% hydrochloric acid, 30ml hydrogen peroxide, the slurry is placed in the pressure vessel that volume is 2000ml, heats up rapidly, keeps Oxygen partial pressure 0.5MPa, total pressure 2.1MPa, react at 200°C for 2 hours, liquid-solid separation after cooling, the solution is rose color, 9.89 grams of rhodium powder is dissolved, and the dissolution rate is >98%.

Embodiment 2

[0026] Embodiment two: take by weighing 10 grams of pure rhodium powder (99.99%), measure 300ml concentration and be 36%~38% hydrochloric acid, 100ml concentration is 65%~68% nitric acid, and slurry is placed in the pressure vessel that volume is 2000ml , rapid temperature rise, oxygen partial pressure 0.0MPa, total pressure 1.6MPa, react at 200°C for 2 hours, liquid-solid separation after cooling, the solution is rose color, 9.92 grams of rhodium powder is dissolved, and the dissolution rate is >98%.

Embodiment 3

[0027] Embodiment three: take by weighing 10 grams of pure rhodium powder (99.99%), measure 300ml concentration and be the hydrochloric acid of 36%~38%, 50g sodium chlorate, slurrying is placed in the pressure vessel that volume is 2000ml, heats up rapidly, keeps Oxygen partial pressure 0.5MPa, total pressure 2.1MPa, react at 200°C for 2 hours, liquid-solid separation after cooling, the solution is rose-colored, 9.88 grams of rhodium powder is dissolved, and the dissolution rate is >98%.

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PUM

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Abstract

The invention discloses a method for quickly dissolving a high-purity rhodium material. A precious metal insoluble rhodium material is mixed with an acid liquid and an oxidant according to a certain proportion and then placed into a customized pressure container, the temperature is controlled to between 160 and 300 DEG C, the oxygen partial pressure is between 0 and 3.0MPa, the reaction time is between 1 and 8 hours, the precious metal rhodium material is quickly dissolved under high temperature and high pressure to produce an acid rhodium solution, the dissolution ratio is more than 98 percent, and the yield is more than 99 percent. The method has the advantages of short flow, short production period, high dissolution efficiency, environmental protection, high yield, low cost, energy conservation and so on, has important popularization value in precious metal industry refining and compound production fields, can reduce the dispersion of precious metal, shorten production period, reduce capital overstocking, and reduce the risk caused by the price fluctuation of the precious metal.

Description

technical field [0001] The invention belongs to the field of nonferrous metal metallurgy. In particular, it relates to a method for dissolving high-purity precious metals and preparing an aqueous solution thereof. Background technique [0002] In the known process of purifying precious metal rhodium and its compounds, its dissolution has the following methods: [0003] 1. Medium-temperature chlorination: chlorinate sodium chloride and rhodium-containing materials in proportion at 650°C to 700°C, and then dissolve. Advantages: Chlorination equipment is easy to solve and easy to mass produce. Disadvantages: long cycle, high return rate and low chlorination efficiency. [0004] 2. Alkali fusion: Raise the temperature of sodium peroxide and rhodium-containing materials in a muffle furnace to 550°C in proportion to melt, and then dissolve. Advantages: higher dissolution efficiency. Disadvantages: long cycle, high energy consumption, mass production and equipment materials ar...

Claims

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Application Information

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IPC IPC(8): C22B11/00
Inventor 赵家春汪云华范兴祥昝林寒吴晓峰关晓伟李柏榆李楠童伟锋吴跃东郭亚琴
Owner KUNMING INST OF PRECIOUS METALS
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