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Method for preparing chloroiridic acid

A technology of chloroiridic acid and chlorine gas is applied in the field of metallurgy, which can solve the problems of chlorine gas emission and long electrolysis period, and achieve the effects of avoiding passivation, fast reaction speed and promoting transformation.

Active Publication Date: 2018-03-06
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The electrolysis method has the characteristics of cleanness and environmental protection, but it also has the disadvantages of long electrolysis cycle and chlorine gas coming out of the anode during the reaction process.

Method used

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  • Method for preparing chloroiridic acid

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Embodiment 1

[0021] Metal iridium powder, of which Ir≥99.5%; analytically pure sodium chloride, of which NaCl content is ≥99.5%; analytically pure soluble starch, of which ignition residue is ≤0.5%; analytically pure hydrochloric acid, of which HCl content is 36.0~38.0%; analytically pure hydrogen Sodium oxide, in which the NaOH content is ≥96.0%; the purity of chlorine gas used is Cl 2 ≥99.5%.

[0022] Weigh 20g of metal iridium powder, mix it evenly with 100g of sodium chloride and 0.5g of starch, and place it in a quartz crucible; place the quartz crucible in a well-type furnace, and then connect a gas absorption device to the flue gas outlet, and the first-stage absorption liquid 500ml of hydrochloric acid solution with a mass concentration of 3%, and the second-stage absorption liquid is 500ml of sodium hydroxide solution with a mass concentration of 20%. When the temperature in the well-type furnace reaches 820°C and the material is in a molten state, start to feed chlorine gas into...

Embodiment 2

[0025] Metal iridium powder, of which Ir≥99.5%; analytically pure sodium chloride, of which NaCl content is ≥99.5%; analytically pure soluble starch, of which ignition residue is ≤0.5%; analytically pure hydrochloric acid, of which HCl content is 36.0~38.0%; analytically pure hydrogen Sodium oxide, in which the NaOH content is ≥96.0%; the purity of chlorine gas used is Cl 2 ≥99.5%.

[0026] Weigh 40g of metal iridium powder, mix it evenly with 240g of sodium chloride and 1.5g of starch, and place it in a quartz crucible; place the quartz crucible in a well-type furnace, and then connect a gas absorption device to the flue gas outlet, and the first-stage absorption liquid They are 1000ml of hydrochloric acid solution with a mass concentration of 5%, and the second-stage absorption liquid is 1000ml of sodium hydroxide solution with a mass concentration of 30%. When the temperature in the well-type furnace reaches 900°C and the material is in a molten state, start to feed chlori...

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Abstract

The invention relates to a method for preparing chloroiridic acid. According to the method disclosed by the invention, firstly, metal iridium powder and sodium chloride are fused at a high temperature, meanwhile, a little amount of starch is added, chlorine is introduced into the fused melt, and most iridium powder is transformed into iridium sodium chloride by a measure of chlorine strengthened stirring; a little part of produced iridium chloride gas is absorbed by using a diluted hydrochloric acid solution; iridium sodium chloride obtained by high-temperature chlorination smelting reaction is merged with a diluted hydrochloric acid absorbing solution, and then sodium hydroxide is added for neutralization to produce iridium oxide, a product is filtered and washed for multiple times to remove sodion, hydrochloric acid is added and dissolved and then concentration is performed to prepare the chloroiridic acid solution. According to the invention, chlorine is introduced into a melt and stirred adequately, and by a measure of smelting in a furnace hearth, transformation of iridium is efficiently promoted, and the leaching efficiency of iridium powder reaches 80% or above; by adding starch, passivation of the surface of the iridium powder in the heating process can be avoided, sufficient transformation of iridium powder is promoted, and by performing secondary absorption on tail gas, comprehensive utilization of a hydrochloric acid absorbing solution is realized, and the comprehensive recovery rate of iridium is increased.

Description

technical field [0001] The invention relates to pyrometallurgical and hydrometallurgical processes in the field of metallurgy, in particular to a method for preparing chloroiridic acid. technical background [0002] Chloroiridic acid is black-brown or black needle-like crystal, and it is an important raw material for preparing other iridium compounds. The preparation methods of chloroiridic acid mainly include high temperature chlorination, alkali fusion and electrolysis. The high-temperature chlorination method is to mix iridium powder and sodium chloride evenly into a quartz boat, place the quartz boat in a tube furnace, and inject chlorine gas into the furnace for chlorination reaction. The reaction temperature is usually controlled at 600~700°C , the tail gas produced by the chlorination reaction is absorbed by lye. After the reaction is completed, sodium chloroiridate is leached with water. After the leachate is oxidized by oxidants such as chlorine or nitric acid, amm...

Claims

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Application Information

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IPC IPC(8): C01G55/00
Inventor 张杜超杨天足刘伟锋陈霖王豪卢一帆
Owner CENT SOUTH UNIV
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