CA2722494A1 - A method for catalytic oxidation of refractory gold concentrate with high contents of sulfur and arsenic under ordinary pressure - Google Patents
A method for catalytic oxidation of refractory gold concentrate with high contents of sulfur and arsenic under ordinary pressure Download PDFInfo
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- CA2722494A1 CA2722494A1 CA2722494A CA2722494A CA2722494A1 CA 2722494 A1 CA2722494 A1 CA 2722494A1 CA 2722494 A CA2722494 A CA 2722494A CA 2722494 A CA2722494 A CA 2722494A CA 2722494 A1 CA2722494 A1 CA 2722494A1
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B3/00—Extraction of metal compounds from ores or concentrates by wet processes
- C22B3/04—Extraction of metal compounds from ores or concentrates by wet processes by leaching
- C22B3/06—Extraction of metal compounds from ores or concentrates by wet processes by leaching in inorganic acid solutions, e.g. with acids generated in situ; in inorganic salt solutions other than ammonium salt solutions
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B11/00—Obtaining noble metals
- C22B11/04—Obtaining noble metals by wet processes
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B11/00—Obtaining noble metals
- C22B11/08—Obtaining noble metals by cyaniding
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B3/00—Extraction of metal compounds from ores or concentrates by wet processes
- C22B3/20—Treatment or purification of solutions, e.g. obtained by leaching
- C22B3/22—Treatment or purification of solutions, e.g. obtained by leaching by physical processes, e.g. by filtration, by magnetic means, or by thermal decomposition
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B3/00—Extraction of metal compounds from ores or concentrates by wet processes
- C22B3/20—Treatment or purification of solutions, e.g. obtained by leaching
- C22B3/44—Treatment or purification of solutions, e.g. obtained by leaching by chemical processes
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
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Abstract
An atmospherically catalyzing and oxidizing method of refractory gold concentrate with high arsenic and high sulfur, comprises ~ adding predefined ore, solid catalyst, acid and water into reaction container with stirrers to form ore pulp; ~
continuously introducing gas oxidizer such as ozone and oxygen, or ozone and air into the pulp at 60-100°C, continuously stirring the mixture to form oxidized ore pulp, reacting for 6 to 18 hrs, then cooling to room temperature and filtering; ~ In accordance with traditional extracting and filtering process, mixing the residue from the filtering step with calcium hydroxide solution to regulate its pH value to 11 ~ 12, adding sodium cyanide, stirring for 24 hrs, and filtering to extract noble metals from filtrate. The method improves the extraction rate of noble metals such as gold and silver in the refractory gold concentrate while reducing the environment pollution.
continuously introducing gas oxidizer such as ozone and oxygen, or ozone and air into the pulp at 60-100°C, continuously stirring the mixture to form oxidized ore pulp, reacting for 6 to 18 hrs, then cooling to room temperature and filtering; ~ In accordance with traditional extracting and filtering process, mixing the residue from the filtering step with calcium hydroxide solution to regulate its pH value to 11 ~ 12, adding sodium cyanide, stirring for 24 hrs, and filtering to extract noble metals from filtrate. The method improves the extraction rate of noble metals such as gold and silver in the refractory gold concentrate while reducing the environment pollution.
Description
A Method for Catalytic Oxidation of Refractory Gold Concentrate with High Contents of Sulfur and Arsenic Under Ordinary Pressure TECHNICAL FIELD
The invention relates to a method for catalytic oxidation of refractory gold concentrate with high contents of sulfur and arsenic under ordinary pressure.
BACKGROUND
The treatment processes for refractory gold concentrate with high contents of sulfur and arsenic in the art mainly include roasting oxidation, pressure oxidation, ordinary pressure oxidation, bacteria oxidation, nitric acid catalytic oxidation, etc. The major disadvantages are low extraction rate of the noble metals such as gold, silver, platinum, palladium and the like, low comprehensive utilization rate of other elements, environmental pollution in the process of noble metal extraction, complicated processes and high cost.
If there exists a catalyst which not only can be regenerated in gaseous phase but also has high solubility in water, and the catalyst also has high cathode potential when the catalyst is deoxidized on the surface of a fluid bed, therefore, the required temperature and oxygen pressure for the oxidation acid leaching of sulfide concentrate can be markedly reduced. This is an important research direction in hydrometallurgy.
SUMMERY OF THE INVENTION
The objects of the invention are to improve the extraction rate of noble metals, such as gold, silver, platinum, palladium, etc., and the comprehensive utilization rate of other elements in the refractory gold concentrate, and to reduce environment pollution in the process of the extraction; in addition, the invention has simple process and low equipment cost.
For the objects, the invention provides an ordinary pressure catalytic oxidation method for the refractory gold concentrate with high contents of sulfur and arsenic.
The working principle of the invention is: the combination bond energy of most molecules is 25 to 35 kcal per mol, but the redox potential of ozone is about 2.07V, and the combination bond energy of ozone is 47 kcal per mol; thus, ozone has enough power to break the combination bond of most molecules, so iron pyrites and arsenopyrite wrapped over the noble metals of gold, silver, etc. can be broken, and the noble metals can be exposed; in addition, the elements of iron, copper and manganese have the functions of catalysis and helping oxygen and ozone to be dissolved and transformed in water.
The key of the invention is the adoption of oxidants and catalyst, and the invention has the following reaction steps:
03 + 0 2+ d eoxidization state [solid catalyst] --- 0'+ oxidation state [solid catalyst]
0'+ oxidation state [solid catalyst] + FeS2 - FeSO4 + deoxidization state [solid catalyst]
The deoxidization state [solid catalyst] can be oxidized again for recycling use, and the oxidization speed for oxygen can be indirectly enhanced.
The method of the invention has the following steps:
Step 1: proper amounts of the concentrate sample, solid catalyst, acid and water are added into a reactor with an agitator at one time, wherein the concentration of the solid catalyst is from 151 to 280 grams per liter, the weight ratio of the concentrate sample to the water is from 1:6 to 1:10; add acid until the pH value reaches 1 to 3 and then a slurry of the refractory gold concentrate is prepared;
Step 2: under the temperature condition of 60 to 100 degrees centigrade, gas oxidants, namely ozone and oxygen, are pumped into the slurry continuously with continuous agitation and react for 6 to 18 hours, wherein the speed of the ozone is 0.8 to 1.2 grams per hour, and the speed of the oxygen is 0.1 to 1.0 cubic meter per hour; or namely ozone and air, wherein the speed of the ozone is 0.8 to 1.2 grams per hour and the speed of the air is 0.1 to 1.0 cubic meter per hour; and then filter liquor and filter residue are obtained by filtration after the slurry is cooled to room temperature;
Step 3: using extraction process know in the art, the filter residue and calcium hydroxide are mixed and the pH value of the mixture is adjusted to 11 to 12, then sodium cyanide is added into the mixture for agitation for 24 hours before filtration, and noble metals are extracted from filter liquor.
The preparation process of the solid catalyst is as follows: industrial iron, copper, hydrochloric acid or chlorine, manganese oxide, alumina and silicon oxide are evenly mixed by agitation under the conditions of ordinary temperature and ordinary pressure, and the chlorine is continuously pumped if the chlorine is adopted in the process so that the weight percentages of the contents of final product are respectively 30% of iron, 30% of chlorine, 15% of oxygen, 10% of copper, 5% of manganese, 5% of silicon and 5% of aluminum.
The acid in the slurry of the refractory gold concentrate can be hydrochloric acid or sulphuric acid.
The invention has the advantages that the extraction rate of the noble metals, such as gold, silver, etc. and the comprehensive utilization rate of other elements in the refractory gold concentrate are improved; simultaneously, environment pollution is reduced in the process of the extraction, and the invention has simple process and low equipment cost. According to measurement based on national standard, the leaching rates of gold and silver are 68-98.5% and 80-96% respectively, while the corresponding leaching rates out of direct cyanidation are less than 40% and 50-60%
respectively without the steps in the invention.
SPECIFIC EXAMPLES OF THE INVENTION
The invention is further illustrated in details with following examples:
Example 1 Referring to Figure 1 which shows the flow chart of the ordinary pressure catalytic oxidation method for the refractory gold concentrate with high contents of sulfur and arsenic, concentrate sample, the solid catalyst, water and sulphuric acid are put into a reactor with an agitator for one time, wherein the concentration of the solid catalyst is 151 grams per liter, and the weight proportion of the concentrate sample to the water is 1:10; then the slurry of the refractory gold concentrate is prepared by adding the sulphuric acid into the mixture until the pH value of the mixture becomes 1.
The preparation process of the solid catalyst in the Example is that industrial iron, copper, manganese oxide, alumina and silicon oxide are evenly mixed by agitation under the conditions of ordinary temperature and ordinary pressure, and chlorine is continuously pumped in the process so that the weight percentages of the contents of final product are respectively 30% of iron, 30% of chlorine, 15% of oxygen, 10% of copper, 5% of manganese, 5% of silicon and 5% of aluminum.
Under the temperature condition of 90 degrees centigrade, ozone and oxygen are pumped into the slurry continuously, wherein the speed of the ozone is 0.8 grams per hour, and the speed of the oxygen is 0.1 cubic meter per hour; then oxidized slurry is formed by continuous agitation; the reaction takes 8 hours, and then filter liquor and filter residue are obtained by filtration after the slurry is cooled to room temperature.
Based on the traditional extraction process, the filter residue and calcium hydroxide are mixed together and the pH value of the mixture is adjusted to 11, and then sodium cyanide is added into the mixture for agitation for 24 hours before filtration, and noble metals are extracted from filter liquor. According to measurement based on national standard, the leaching rates of gold and silver are 82 . 65 % and 88 . 77 %, respectively.
Example 2 Operation steps are exactly the same as the steps in Example 1, wherein the preparation process of the solid catalyst is that industrial iron, copper, hydrochloric acid, manganese oxide, alumina and silicon oxide are evenly mixed by agitation under the conditions of ordinary temperature and ordinary pressure so that the weight percentages of the contents of final product are respectively 30% of iron, 30%
of chlorine, 15% of oxygen, 10% of copper, 5% of manganese, 5% of silicon and 5%
of aluminum.
In the Example, the concentration of the solid catalyst is 280 grams per liter, and the weight proportion of the concentrate sample to the water is 1:10; then hydrochloric acid is added until the pH value of mixture becomes 1. Under the temperature condition of 100 degrees centigrade, ozone and air are pumped into the slurry continuously, wherein the speed of the ozone is 1.2 grams per hour, the speed of the air is 0.4 cubic meter per hour, and the reaction takes 16 hours; based on the traditional extraction process, the filter residue and calcium hydroxide are mixed together and the pH value of the mixture is adjusted to 12, and then sodium cyanide is added into the mixture for agitation for 24 hours before filtration.
According to measurement based on national standard, the leaching rates of gold and silver are 98.45% and 95.27%, respectively.
Example 3 Operation steps are exactly the same as the steps in Example 1, wherein the preparation process of the solid catalyst is that industrial iron, copper, hydrochloric acid, manganese oxide, alumina and silicon oxide are evenly mixed by agitation under the conditions of ordinary temperature and ordinary pressure so that the weight percentages of the contents of final product are respectively 30% of iron, 30%
of chlorine, 15% of oxygen, 10% of copper, 5% of manganese, 5% of silicon and 5%
of aluminum.
In the Example, the concentration of the solid catalyst is 170 grams per liter, and the weight proportion of the concentrate sample to the water is 1: 6; then sulphuric acid is added until the pH value of mixture becomes 3. Under the temperature condition of 70 degrees centigrade, ozone and air are pumped into the slurry continuously, wherein the speed of the ozone is 1.0 grams per hour, the speed of the air is 0.8 cubic meter per hour, and the reaction takes 12 hours; based on the traditional extraction process, the filter residue and calcium hydroxide are mixed together and the pH value of the mixture is adjusted to 11, and then sodium cyanide is added into the mixture for agitation for 24 hours before filtration. According to measurement based on national standard, the leaching rates of gold and silver are 68.32% and 81.02%, respectively.
Example 4 Operation steps are exactly the same as the steps in Example 1, wherein the preparation process o f the solid catalyst is that industrial iron, copper, chlorine, manganese oxide, alumina and silicon oxide are evenly mixed by agitation under the conditions of ordinary temperature and ordinary pressure, and chlorine is continuously pumped in the process so that the weight percentages of the contents of final product are respectively 30% of iron, 30% of chlorine, 15% of oxygen, 10% of copper, 5% of manganese, 5% of silicon and 5% of aluminum.
In the Example, the concentration of the solid catalyst is 230 grams per liter, and the weight proportion of the concentrate sample to the water is 1: 8; then hydrochloric acid is added until the pH value of mixture becomes 3. Ozone and oxygen are pumped into the slurry continuously, wherein the speed of the ozone is 0.9 grams per hour, the speed of the oxygen is 1.0 cubic meter per hour, and the reaction takes 8 hours; based on traditional extraction process, the filter residue and calcium hydroxide are mixed together and the pH value of the mixture is adjusted to 12, and then sodium cyanide is added into the mixture for agitation for 24 hours before filtration. According to measurement based on national standard, the leaching rates of gold and silver are 76.25% and 92.19%, respectively.
The invention relates to a method for catalytic oxidation of refractory gold concentrate with high contents of sulfur and arsenic under ordinary pressure.
BACKGROUND
The treatment processes for refractory gold concentrate with high contents of sulfur and arsenic in the art mainly include roasting oxidation, pressure oxidation, ordinary pressure oxidation, bacteria oxidation, nitric acid catalytic oxidation, etc. The major disadvantages are low extraction rate of the noble metals such as gold, silver, platinum, palladium and the like, low comprehensive utilization rate of other elements, environmental pollution in the process of noble metal extraction, complicated processes and high cost.
If there exists a catalyst which not only can be regenerated in gaseous phase but also has high solubility in water, and the catalyst also has high cathode potential when the catalyst is deoxidized on the surface of a fluid bed, therefore, the required temperature and oxygen pressure for the oxidation acid leaching of sulfide concentrate can be markedly reduced. This is an important research direction in hydrometallurgy.
SUMMERY OF THE INVENTION
The objects of the invention are to improve the extraction rate of noble metals, such as gold, silver, platinum, palladium, etc., and the comprehensive utilization rate of other elements in the refractory gold concentrate, and to reduce environment pollution in the process of the extraction; in addition, the invention has simple process and low equipment cost.
For the objects, the invention provides an ordinary pressure catalytic oxidation method for the refractory gold concentrate with high contents of sulfur and arsenic.
The working principle of the invention is: the combination bond energy of most molecules is 25 to 35 kcal per mol, but the redox potential of ozone is about 2.07V, and the combination bond energy of ozone is 47 kcal per mol; thus, ozone has enough power to break the combination bond of most molecules, so iron pyrites and arsenopyrite wrapped over the noble metals of gold, silver, etc. can be broken, and the noble metals can be exposed; in addition, the elements of iron, copper and manganese have the functions of catalysis and helping oxygen and ozone to be dissolved and transformed in water.
The key of the invention is the adoption of oxidants and catalyst, and the invention has the following reaction steps:
03 + 0 2+ d eoxidization state [solid catalyst] --- 0'+ oxidation state [solid catalyst]
0'+ oxidation state [solid catalyst] + FeS2 - FeSO4 + deoxidization state [solid catalyst]
The deoxidization state [solid catalyst] can be oxidized again for recycling use, and the oxidization speed for oxygen can be indirectly enhanced.
The method of the invention has the following steps:
Step 1: proper amounts of the concentrate sample, solid catalyst, acid and water are added into a reactor with an agitator at one time, wherein the concentration of the solid catalyst is from 151 to 280 grams per liter, the weight ratio of the concentrate sample to the water is from 1:6 to 1:10; add acid until the pH value reaches 1 to 3 and then a slurry of the refractory gold concentrate is prepared;
Step 2: under the temperature condition of 60 to 100 degrees centigrade, gas oxidants, namely ozone and oxygen, are pumped into the slurry continuously with continuous agitation and react for 6 to 18 hours, wherein the speed of the ozone is 0.8 to 1.2 grams per hour, and the speed of the oxygen is 0.1 to 1.0 cubic meter per hour; or namely ozone and air, wherein the speed of the ozone is 0.8 to 1.2 grams per hour and the speed of the air is 0.1 to 1.0 cubic meter per hour; and then filter liquor and filter residue are obtained by filtration after the slurry is cooled to room temperature;
Step 3: using extraction process know in the art, the filter residue and calcium hydroxide are mixed and the pH value of the mixture is adjusted to 11 to 12, then sodium cyanide is added into the mixture for agitation for 24 hours before filtration, and noble metals are extracted from filter liquor.
The preparation process of the solid catalyst is as follows: industrial iron, copper, hydrochloric acid or chlorine, manganese oxide, alumina and silicon oxide are evenly mixed by agitation under the conditions of ordinary temperature and ordinary pressure, and the chlorine is continuously pumped if the chlorine is adopted in the process so that the weight percentages of the contents of final product are respectively 30% of iron, 30% of chlorine, 15% of oxygen, 10% of copper, 5% of manganese, 5% of silicon and 5% of aluminum.
The acid in the slurry of the refractory gold concentrate can be hydrochloric acid or sulphuric acid.
The invention has the advantages that the extraction rate of the noble metals, such as gold, silver, etc. and the comprehensive utilization rate of other elements in the refractory gold concentrate are improved; simultaneously, environment pollution is reduced in the process of the extraction, and the invention has simple process and low equipment cost. According to measurement based on national standard, the leaching rates of gold and silver are 68-98.5% and 80-96% respectively, while the corresponding leaching rates out of direct cyanidation are less than 40% and 50-60%
respectively without the steps in the invention.
SPECIFIC EXAMPLES OF THE INVENTION
The invention is further illustrated in details with following examples:
Example 1 Referring to Figure 1 which shows the flow chart of the ordinary pressure catalytic oxidation method for the refractory gold concentrate with high contents of sulfur and arsenic, concentrate sample, the solid catalyst, water and sulphuric acid are put into a reactor with an agitator for one time, wherein the concentration of the solid catalyst is 151 grams per liter, and the weight proportion of the concentrate sample to the water is 1:10; then the slurry of the refractory gold concentrate is prepared by adding the sulphuric acid into the mixture until the pH value of the mixture becomes 1.
The preparation process of the solid catalyst in the Example is that industrial iron, copper, manganese oxide, alumina and silicon oxide are evenly mixed by agitation under the conditions of ordinary temperature and ordinary pressure, and chlorine is continuously pumped in the process so that the weight percentages of the contents of final product are respectively 30% of iron, 30% of chlorine, 15% of oxygen, 10% of copper, 5% of manganese, 5% of silicon and 5% of aluminum.
Under the temperature condition of 90 degrees centigrade, ozone and oxygen are pumped into the slurry continuously, wherein the speed of the ozone is 0.8 grams per hour, and the speed of the oxygen is 0.1 cubic meter per hour; then oxidized slurry is formed by continuous agitation; the reaction takes 8 hours, and then filter liquor and filter residue are obtained by filtration after the slurry is cooled to room temperature.
Based on the traditional extraction process, the filter residue and calcium hydroxide are mixed together and the pH value of the mixture is adjusted to 11, and then sodium cyanide is added into the mixture for agitation for 24 hours before filtration, and noble metals are extracted from filter liquor. According to measurement based on national standard, the leaching rates of gold and silver are 82 . 65 % and 88 . 77 %, respectively.
Example 2 Operation steps are exactly the same as the steps in Example 1, wherein the preparation process of the solid catalyst is that industrial iron, copper, hydrochloric acid, manganese oxide, alumina and silicon oxide are evenly mixed by agitation under the conditions of ordinary temperature and ordinary pressure so that the weight percentages of the contents of final product are respectively 30% of iron, 30%
of chlorine, 15% of oxygen, 10% of copper, 5% of manganese, 5% of silicon and 5%
of aluminum.
In the Example, the concentration of the solid catalyst is 280 grams per liter, and the weight proportion of the concentrate sample to the water is 1:10; then hydrochloric acid is added until the pH value of mixture becomes 1. Under the temperature condition of 100 degrees centigrade, ozone and air are pumped into the slurry continuously, wherein the speed of the ozone is 1.2 grams per hour, the speed of the air is 0.4 cubic meter per hour, and the reaction takes 16 hours; based on the traditional extraction process, the filter residue and calcium hydroxide are mixed together and the pH value of the mixture is adjusted to 12, and then sodium cyanide is added into the mixture for agitation for 24 hours before filtration.
According to measurement based on national standard, the leaching rates of gold and silver are 98.45% and 95.27%, respectively.
Example 3 Operation steps are exactly the same as the steps in Example 1, wherein the preparation process of the solid catalyst is that industrial iron, copper, hydrochloric acid, manganese oxide, alumina and silicon oxide are evenly mixed by agitation under the conditions of ordinary temperature and ordinary pressure so that the weight percentages of the contents of final product are respectively 30% of iron, 30%
of chlorine, 15% of oxygen, 10% of copper, 5% of manganese, 5% of silicon and 5%
of aluminum.
In the Example, the concentration of the solid catalyst is 170 grams per liter, and the weight proportion of the concentrate sample to the water is 1: 6; then sulphuric acid is added until the pH value of mixture becomes 3. Under the temperature condition of 70 degrees centigrade, ozone and air are pumped into the slurry continuously, wherein the speed of the ozone is 1.0 grams per hour, the speed of the air is 0.8 cubic meter per hour, and the reaction takes 12 hours; based on the traditional extraction process, the filter residue and calcium hydroxide are mixed together and the pH value of the mixture is adjusted to 11, and then sodium cyanide is added into the mixture for agitation for 24 hours before filtration. According to measurement based on national standard, the leaching rates of gold and silver are 68.32% and 81.02%, respectively.
Example 4 Operation steps are exactly the same as the steps in Example 1, wherein the preparation process o f the solid catalyst is that industrial iron, copper, chlorine, manganese oxide, alumina and silicon oxide are evenly mixed by agitation under the conditions of ordinary temperature and ordinary pressure, and chlorine is continuously pumped in the process so that the weight percentages of the contents of final product are respectively 30% of iron, 30% of chlorine, 15% of oxygen, 10% of copper, 5% of manganese, 5% of silicon and 5% of aluminum.
In the Example, the concentration of the solid catalyst is 230 grams per liter, and the weight proportion of the concentrate sample to the water is 1: 8; then hydrochloric acid is added until the pH value of mixture becomes 3. Ozone and oxygen are pumped into the slurry continuously, wherein the speed of the ozone is 0.9 grams per hour, the speed of the oxygen is 1.0 cubic meter per hour, and the reaction takes 8 hours; based on traditional extraction process, the filter residue and calcium hydroxide are mixed together and the pH value of the mixture is adjusted to 12, and then sodium cyanide is added into the mixture for agitation for 24 hours before filtration. According to measurement based on national standard, the leaching rates of gold and silver are 76.25% and 92.19%, respectively.
Claims (3)
1. A method for catalytic oxidation of refractory gold concentrate with high Contents of sulfur and arsenic under ordinary pressure, wherein the method comprises the following steps:
Step 1: proper amounts of the concentrate sample, solid catalyst, acid and water are added into a reactor with an agitator at one time, wherein the concentration of the solid catalyst is from 151 to 280 grams per liter, the weight ratio of the concentrate sample to the water is from 1:6 to 1:10;
add acid until the pH value reaches 1 to 3 and then a slurry of the refractory gold concentrate is prepared;
Step 2: under the temperature condition of 60 to 100 degrees centigrade, gas oxidants, namely ozone and oxygen, are pumped into the slurry continuously with continuous agitation and react for 6 to 18 hours, wherein the speed of the ozone is 0.8 to 1.2 grams per hour, and the speed of the oxygen is 0.1 to 1.0 cubic meter per hour; or namely ozone and air, wherein the speed of the ozone is 0.8 to 1.2 grams per hour and the speed of the air is 0.1 to 1.0 cubic meter per hour; and then filter liquor and filter residue are obtained by filtration after the slurry is cooled to room temperature;
Step 3: using extraction process know in the art, the filter residue and calcium hydroxide are mixed and the pH value of the mixture is adjusted to 11 to 12, then sodium cyanide is added into the mixture for agitation for 24 hours before filtration, and noble metals are extracted from filter liquor.
Step 1: proper amounts of the concentrate sample, solid catalyst, acid and water are added into a reactor with an agitator at one time, wherein the concentration of the solid catalyst is from 151 to 280 grams per liter, the weight ratio of the concentrate sample to the water is from 1:6 to 1:10;
add acid until the pH value reaches 1 to 3 and then a slurry of the refractory gold concentrate is prepared;
Step 2: under the temperature condition of 60 to 100 degrees centigrade, gas oxidants, namely ozone and oxygen, are pumped into the slurry continuously with continuous agitation and react for 6 to 18 hours, wherein the speed of the ozone is 0.8 to 1.2 grams per hour, and the speed of the oxygen is 0.1 to 1.0 cubic meter per hour; or namely ozone and air, wherein the speed of the ozone is 0.8 to 1.2 grams per hour and the speed of the air is 0.1 to 1.0 cubic meter per hour; and then filter liquor and filter residue are obtained by filtration after the slurry is cooled to room temperature;
Step 3: using extraction process know in the art, the filter residue and calcium hydroxide are mixed and the pH value of the mixture is adjusted to 11 to 12, then sodium cyanide is added into the mixture for agitation for 24 hours before filtration, and noble metals are extracted from filter liquor.
2. The method for catalytic oxidation of refractory gold concentrate with high contents of sulfur and arsenic under ordinary pressure according to Claim 1, wherein the acid in Step 1 is hydrochloric acid or sulphuric acid.
3. The method for catalytic oxidation of refractory gold concentrate with high contents of sulfur and arsenic under ordinary pressure according to Claim 1, wherein the preparation process of the solid catalyst in Step 1 is: industrial iron, copper, hydrochloric acid or chlorine, manganese oxide, alumina oxide and silicon oxide are mixed by agitation under ordinary temperature and ordinary pressure; and the chlorine is continuously pumped if the chlorine is adopted in the process so that the mess percentages of the elements of the final catalyst are respectively 30% of iron, 30% of chlorine, 15% of oxygen, 10% of copper, 5% of manganese, 5% of silicon and 5% of aluminum.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810038939.1 | 2008-06-13 | ||
| CN2008100389391A CN101314815B (en) | 2008-06-13 | 2008-06-13 | Atmosphere-pressure catalytic oxidation method for high-sulfur high-arsenic hard washing golden ore concentrate |
| PCT/CN2008/001924 WO2009149590A1 (en) | 2008-06-13 | 2008-11-25 | Atmospherically catalyzing and oxidizing method of refractory gold concentrate with high arsenic and high sulfur |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2722494A1 true CA2722494A1 (en) | 2009-12-17 |
| CA2722494C CA2722494C (en) | 2016-04-05 |
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| Application Number | Title | Priority Date | Filing Date |
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| CA2722494A Expired - Fee Related CA2722494C (en) | 2008-06-13 | 2008-11-25 | A method for catalytic oxidation of refractory gold concentrate with high contents of sulfur and arsenic under ordinary pressure |
Country Status (3)
| Country | Link |
|---|---|
| CN (1) | CN101314815B (en) |
| CA (1) | CA2722494C (en) |
| WO (1) | WO2009149590A1 (en) |
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| CN102115814B (en) * | 2010-12-14 | 2016-04-13 | 哈尔滨工业大学（威海） | The atmosphere-pressure catalytic oxidation method of difficult Gold Concentrates Together With Complicated Metals Sulphides |
| CN102181632A (en) * | 2011-05-10 | 2011-09-14 | 长春黄金研究院 | Wet pretreatment method for carbonaceous refractory gold concentrate |
| US9371228B2 (en) | 2013-09-12 | 2016-06-21 | Air Products And Chemicals, Inc. | Integrated process for production of ozone and oxygen |
| CN105349797B (en) * | 2014-08-20 | 2018-05-22 | 中国科学院过程工程研究所 | A kind of method containing golden tailing or cyanidation tailings pretreatment desiliconization leaching gold |
| CN104313343B (en) * | 2014-11-11 | 2016-02-24 | 南华大学 | A kind of high arsenic leaches gold extracting method containing gold sulfur concentrate oxidizing roasting-microwave-assisted |
| CN108034836A (en) * | 2017-11-30 | 2018-05-15 | 广西大学 | The method for pre-oxidizing of sulfide type Gold Concentrate under Normal Pressure |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4647307A (en) * | 1983-01-18 | 1987-03-03 | Rein Raudsepp | Process for recovering gold and silver from refractory ores |
| CN1004426B (en) * | 1987-06-22 | 1989-06-07 | 中国科学院化工冶金研究所 | Catalytic oxidation acid method for pretreating refractory gold concentrate |
| US5071477A (en) * | 1990-05-03 | 1991-12-10 | American Barrick Resources Corporation of Toronto | Process for recovery of gold from refractory ores |
| CN100371478C (en) * | 2006-02-11 | 2008-02-27 | 欧华北 | Wet preprocessing method for difficult-to-treat gold ore containing arsenic and antimony |
| CN100404707C (en) * | 2006-08-03 | 2008-07-23 | 山东国大黄金股份有限公司 | Method of extracting gold and silver from arsenic containing aurin ore |
-
2008
- 2008-06-13 CN CN2008100389391A patent/CN101314815B/en not_active Expired - Fee Related
- 2008-11-25 CA CA2722494A patent/CA2722494C/en not_active Expired - Fee Related
- 2008-11-25 WO PCT/CN2008/001924 patent/WO2009149590A1/en active Application Filing
Also Published As
| Publication number | Publication date |
|---|---|
| CN101314815A (en) | 2008-12-03 |
| WO2009149590A1 (en) | 2009-12-17 |
| CN101314815B (en) | 2010-09-08 |
| CA2722494C (en) | 2016-04-05 |
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