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A pilot process of UDD chemical purification UDD using a rocket oxidizer of “melange” type with expired storage term was developed and put into practice. The process is based on oxidation of diamond-containing blend by nitric acid solutions in the temperature range of 110–320°C and pressure up to 10 MPa. Methods of preliminary treatment and purification of the oxidizer are developed. The regimes of high-pressure and temperature treatment of diamond-containing mixture with the account of elevated chemical activity of the oxidizer are optimized. Specific impurities in the oxidizer and their behavior at high temperature and pressure are studied, and methods of impurity separation from the desired product are suggested. Corrosion effect of the oxidizer and its products on suggested high-pressure equipment is investigated.

A pilot process of UDD chemical purification UDD using a rocket oxidizer of “melange” type with expired storage term was developed and put into practice. The process is based on oxidation of diamond-containing blend by nitric acid solutions in the temperature range of 110–320°C and pressure up to 10 MPa. Methods of preliminary treatment and purification of the oxidizer are developed. The regimes of high-pressure and temperature treatment of diamond-containing mixture with the account of elevated chemical activity of the oxidizer are optimized. Specific impurities in the oxidizer and their behavior at high temperature and pressure are studied, and methods of impurity separation from the desired product are suggested. Corrosion effect of the oxidizer and its products on suggested high-pressure equipment is investigated.

A pilot process of UDD chemical purification UDD using a rocket oxidizer of “melange” type with expired storage term was developed and put into practice. The process is based on oxidation of diamond-containing blend by nitric acid solutions in the temperature range of 110–320°C and pressure up to 10 MPa. Methods of preliminary treatment and purification of the oxidizer are developed. The regimes of high-pressure and temperature treatment of diamond-containing mixture with the account of elevated chemical activity of the oxidizer are optimized. Specific impurities in the oxidizer and their behavior at high temperature and pressure are studied, and methods of impurity separation from the desired product are suggested. Corrosion effect of the oxidizer and its products on suggested high-pressure equipment is investigated.

A pilot process of UDD chemical purification UDD using a rocket oxidizer of “melange” type with expired storage term was developed and put into practice. The process is based on oxidation of diamond-containing blend by nitric acid solutions in the temperature range of 110–320°C and pressure up to 10 MPa. Methods of preliminary treatment and purification of the oxidizer are developed. The regimes of high-pressure and temperature treatment of diamond-containing mixture with the account of elevated chemical activity of the oxidizer are optimized. Specific impurities in the oxidizer and their behavior at high temperature and pressure are studied, and methods of impurity separation from the desired product are suggested. Corrosion effect of the oxidizer and its products on suggested high-pressure equipment is investigated.

A pilot process of UDD chemical purification UDD using a rocket oxidizer of “melange” type with expired storage term was developed and put into practice. The process is based on oxidation of diamond-containing blend by nitric acid solutions in the temperature range of 110–320°C and pressure up to 10 MPa. Methods of preliminary treatment and purification of the oxidizer are developed. The regimes of high-pressure and temperature treatment of diamond-containing mixture with the account of elevated chemical activity of the oxidizer are optimized. Specific impurities in the oxidizer and their behavior at high temperature and pressure are studied, and methods of impurity separation from the desired product are suggested. Corrosion effect of the oxidizer and its products on suggested high-pressure equipment is investigated.

A pilot process of UDD chemical purification UDD using a rocket oxidizer of “melange” type with expired storage term was developed and put into practice. The process is based on oxidation of diamond-containing blend by nitric acid solutions in the temperature range of 110–320°C and pressure up to 10 MPa. Methods of preliminary treatment and purification of the oxidizer are developed. The regimes of high-pressure and temperature treatment of diamond-containing mixture with the account of elevated chemical activity of the oxidizer are optimized. Specific impurities in the oxidizer and their behavior at high temperature and pressure are studied, and methods of impurity separation from the desired product are suggested. Corrosion effect of the oxidizer and its products on suggested high-pressure equipment is investigated.

A pilot process of UDD chemical purification UDD using a rocket oxidizer of “melange” type with expired storage term was developed and put into practice. The process is based on oxidation of diamond-containing blend by nitric acid solutions in the temperature range of 110–320°C and pressure up to 10 MPa. Methods of preliminary treatment and purification of the oxidizer are developed. The regimes of high-pressure and temperature treatment of diamond-containing mixture with the account of elevated chemical activity of the oxidizer are optimized. Specific impurities in the oxidizer and their behavior at high temperature and pressure are studied, and methods of impurity separation from the desired product are suggested. Corrosion effect of the oxidizer and its products on suggested high-pressure equipment is investigated.

A pilot process of UDD chemical purification UDD using a rocket oxidizer of “melange” type with expired storage term was developed and put into practice. The process is based on oxidation of diamond-containing blend by nitric acid solutions in the temperature range of 110–320°C and pressure up to 10 MPa. Methods of preliminary treatment and purification of the oxidizer are developed. The regimes of high-pressure and temperature treatment of diamond-containing mixture with the account of elevated chemical activity of the oxidizer are optimized. Specific impurities in the oxidizer and their behavior at high temperature and pressure are studied, and methods of impurity separation from the desired product are suggested. Corrosion effect of the oxidizer and its products on suggested high-pressure equipment is investigated.