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Chlorine dioxide gold leaching method for preparing leaching agent in ore pulp

A chlorine dioxide and pulp technology, applied in the field of metallurgy, can solve the problems of toxic bromide volatilization, high leaching cost, and difficulty in industrial application, and achieve economic benefits, improve direct leaching rate, and simplify the gold leaching operation process.

Pending Publication Date: 2022-02-18
上海逢石科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Patent application CN95105351.5 discloses a bromide leaching solution gold extraction process, which consists of ore crushing, batching, roasting and leaching, pulping, solid-liquid separation, gold recovery and other processes, using bromide-sulfuric acid-chlorine dioxide composition The gold leaching system and the staged leaching process speed up the gold extraction speed, reduce the amount of reagents, and increase the leaching speed and leaching rate. However, this method has disadvantages such as the volatilization of toxic bromide and the need to prepare chlorine dioxide gas, and there are many shortcomings in industrial applications. Big difficulty; patent application CN201510027146.X discloses a method for ultrasonically enhanced chlorination and oxidation synergistic leaching of gold in refractory gold ores. The ore powder, sodium hydroxide, sodium hypochlorite and water are fully mixed to obtain a pulp, and air is introduced into the pulp , carry out ultrasonic enhanced leaching under stirring conditions, periodically add hydrogen peroxide during the enhanced leaching process, and use ultrasonic enhancement and the synergistic effect of hydrogen peroxide and sodium hydroxide to achieve non-cyanide leaching, but this method has a complicated reagent system and ultrasonic enhancement is required for the leaching process Auxiliary, high leaching cost

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  • Chlorine dioxide gold leaching method for preparing leaching agent in ore pulp
  • Chlorine dioxide gold leaching method for preparing leaching agent in ore pulp
  • Chlorine dioxide gold leaching method for preparing leaching agent in ore pulp

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Embodiment 1

[0039] The ore sample used in this example is a Carlin-type gold deposit in Gansu. This type of gold ore is mainly composed of pyrite, stibnite, and arsenopyrite, and metal sulfides are scattered in the ore. Gold is usually wrapped in sulfide minerals in the form of fine particles or submicroscopic particles, and the gold is directly cyanide leached. The rate is 39%, which belongs to refractory ore, and its chemical composition is shown in Table 1.

[0040] Table 1: Raw ore multi-element analysis results (%, * g / t)

[0041]

[0042] Finely grind the above-mentioned gold ore until particles with a particle size of no more than 0.074mm account for 90%, add sulfuric acid at a concentration of 0.625mol / L, tartaric acid at a concentration of 0.20mol / L, sodium chloride at a concentration of 0.05mol / L, and sodium chlorite at a concentration of 0.30mol / L, the liquid-solid mass ratio is 4:1, and the leaching rate of gold can reach 91.02% under the condition of stirring speed of 90...

Embodiment 2

[0044] The type of ore sample used in this example is carbonaceous refractory gold ore, and its chemical composition is shown in Table 2. Due to the gold-intercepting effect of organic carbon, the direct cyanide leaching rate of this ore is only 9.29%, which is a refractory gold ore.

[0045] Table 2: Multi-element analysis results of a carbonaceous gold ore (%, * g / t)

[0046]

[0047] Roast the gold ore to be leached in an oxygen-enriched environment at 700°C for 1 hour to remove the gold-intercepting carbon. After the roasted slag is finely ground, the slurry is adjusted, and chlorine dioxide generators (sodium chlorite NaClO 2 , concentration 0.12mol / L) and activator (citric acid C 6 h 8 o 7 , concentration 0.10mol / L), the generated chlorine dioxide is dissolved in the pulp, and immediately reacts with gold minerals to realize gold leaching. The specific process is as follows: finely grind 500g of roasted slag until the particle size is less than 0.074mm, accounti...

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Abstract

The invention discloses a chlorine dioxide gold leaching method for preparing a gold leaching agent in ore pulp. The method comprises the following steps of: respectively adding a generating agent and an activating agent for preparing chlorine dioxide into the gold ore pulp, and reacting to generate the gold leaching agent chlorine dioxide; and dissolving the generated chlorine dioxide in the ore pulp, then carrying out chemical reaction on the chlorine dioxide and the gold minerals, dissolving the gold, generating stable gold chloride complex ions, entering the solution, acquiring a gold leaching solution, and recovering the target product gold. According to the chlorine dioxide gold leaching method, the chlorine dioxide generating agent and the activating agent directly react in the ore pulp to prepare chlorine dioxide, traditional highly toxic cyanide is completely replaced with chlorine dioxide, the gold leaching operation process is greatly simplified, meanwhile, environment-friendly cyanide-free gold leaching is achieved, the chlorine dioxide is prepared through the reaction of the solid agent in the ore pulp, toxic waste gas, waste water and toxic byproducts are not generated in the leaching process, and the method is simple, environmentally friendly and easy to control and industrialize.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a chlorine dioxide gold leaching method for preparing a leaching agent in ore pulp. Background technique [0002] Gold is usually extracted from ores or gold-containing wastes by hydrometallurgy. The cyanide leaching method is widely used in gold production because of its outstanding advantages such as simple operation, high recovery rate, and low production cost. However, cyanide leaching gold The speed is slow, and the leaching effect on gold ore containing carbon, arsenic, antimony, copper and other elements is poor, and it is highly toxic, which cannot meet the sustainable development needs of the gold industry. In recent years, mineral processing workers have conducted in-depth research on non-cyanide gold leaching technology and leaching agents, and proposed a variety of new gold leaching methods. Some methods have reached the level of industrial application ...

Claims

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Application Information

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IPC IPC(8): C22B11/06C01B11/02
CPCC22B11/06C01B11/024
Inventor 韩跃新李艳军高占奎
Owner 上海逢石科技有限公司
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